Eight Selection Steps of CNC Machine Tools

With the development of modern manufacturing technology, the use of numerical control equipment by enterprises is a general trend. At present, the numerical control equipment on the market can be described as dazzling. How can we choose economically and reasonably suitable CNC equipment for the company? It has always been a topic of concern. This article completely discusses the problems that should be paid attention to in the selection process from the technical point of view.

For a manufacturing company, the improvement of production capacity often starts from the aspects of production management, manufacturing processes, production equipment and other aspects of technological transformation, and these parts are mutually influential and restrictive. In the technological upgrading, the selection of production equipment, CNC machine tools, maintenance, and procurement must take into consideration what kind of environment to use, how to manage, and how to achieve the best economic results.

The manufacturing equipment is selected for the manufacture of certain products. The selected equipment may be used for a part of the processing of the product parts, and may also be used for the entire process. The level of manufacturing depends first and foremost on the design of the process. It will determine the methods and means to be used for processing. This also determines the basic requirements for the use of equipment. This is also the basis for the technical organization and management of production. The basic requirements for equipment selection must be determined based on what kind of equipment can be provided on the market. For most small and medium-sized production companies, choosing CNC machine tools to replace old machine tools or increase production capacity is a development trend.

Comparing the performance of ordinary and CNC two types of machine tools, CNC machine tools have the ability to process complex surface parts, adapt to a variety of processing objects (strong flexibility); processing quality, precision and high processing efficiency; adapt to CAD/CAM networking, suitable for manufacturing and processing information Integrated management; high utilization rate of equipment and low normal operating costs.

Choosing a CNC machine tool is a comprehensive technical problem. Now, whether it is domestic or foreign, it can produce a wide range of equipment. After decades of development, CNC machine tools have evolved into a large family group that can complete a variety of manufacturing and manufacturing requirements. How to choose suitable equipment from a wide variety of expensive equipment, how to make these equipment fully play a role in the manufacturing and can meet the company's future development, how to correctly and reasonably purchase accessories, tools, and software for the host Technology, after-sales technical services, etc., enable the procurement of equipment to achieve a better ratio of investment ... These problems are the majority of purchasers must consider, and one by one to deal with good issues.

First, determine the typical processing artifact "family"

Deciding which part to process is the first step in selecting a device. According to the needs of technological transformation and production development, enterprises determine which parts and processes are ready to be completed with new processing equipment, taking into account the long-term planning of product development. Grouping these parts into groups using grouping techniques to identify the typical part families that are to prepare the main processing objects. In the categorization, it often encounters the problems of large differences in parts sizes, large differences in part shapes, and the processing time of various parts greatly exceeds the full-load working hours of the equipment. Therefore, it is necessary to further select a typical workpiece family that is close to the requirements in determining the production program. . The typical workpiece family can be divided into diamond type (box type), board type, rotary type (disk, sleeve, shaft, flange) and profile type according to the shape; it can be divided into ordinary grade and precision grade according to the processing precision requirements. Wait. The classification of typical parts is clear, and the basic processing equipment is relatively clear.

Second, the typical part family of process design

After the processing of parts is determined, a new planning and design of the process must be carried out with the view of numerical control processing technology. This includes the transformation of the original production process, the feasibility of exploring new process methods, and the exploration of modern production management and logistics management. Feasibility, Exploring the feasibility of using advanced tooling tools to greatly increase production efficiency, Exploring reasonable preparation techniques for numerical control equipment and other equipment (ordinary, special machines) on the production line, etc. The purpose is to obtain the best after using CNC machine tools. Process manufacturing process. The following is a reasonable processing of several typical parts.

☆Shaft parts: Milling the end face to hit the center hole → CNC lathe (roughing) → CNC grinding machine (finishing);

☆ Flange and disc type: CNC lathe (roughing) → turning center (finishing);

☆ cavity mold parts: General machine tool shape and surface → CNC milling machine processing → high-speed CNC milling finishing → polishing or electrolytic corrosion surface;

☆ board parts: double-axis milling machine or gantry milling machine processing → vertical machining center processing all kinds of holes;

☆ Cabinet parts: machining the bottom surface of the vertical machining center → machining the technical surface of the four-sided surface on the horizontal machining center.

Consider the following factors in arranging the process flow:

(1) Select the shortest process flow.

(2) CNC machine tools have considerable adaptability, but they are not universal. From the economic point of view, each component of a typical workpiece family has an economic volume, and more advanced technological means should be used on an economical basis.

(3) To make full use of various technological features of the machine tool, and to maximize the comprehensive processing capability of the CNC machine tool (multi-process centralized process features). The minimum number of machine tools, the minimum number of process equipment and fixtures should be configured in the production process. .

(4) Consider the balance of various equipment capabilities in the production line or production plant. As the choice of a single CNC machine tool or the configuration of a production line, a single device cannot completely package all the processing operations of a workpiece. It is inevitable that there is a transfer process with other equipment. The production capacity between the devices must be balanced to meet the production. The comprehensive requirements of the beats, so arrange the number of processes and the sequence of processing steps on each device to make use of the strengths of each CNC machine tool to meet the accuracy requirements, and further consider the reasonableness of the process standards for the workpieces on each machine. use.

(5) The problems often encountered in arranging CNC machining processes are the contradiction between the process concentration and the gradual refining of the processing technology. In the use of CNC machine tools, people generally adopt the principle of concentration of multiple processes concentrated on a machine tool, in order to pursue increased productivity, shorten the part processing cycle, and even hope that the workpiece in a single installation of all processing. However, in fact, for some complicated and high-precision workpieces, due to thermal deformation during processing, workpiece deformation caused by internal stress, fixture clamping deformation, heat treatment requirements and other process factors such as process factors and editorial operating factors, etc. It is difficult to complete all processing at one time. The gradual refinement of processed parts in the basic process guidelines restricts the number of process steps. Proper handling of these two contradictions is an important part of the NC machining process.

(6) In the arrangement of the process flow of the typical workpiece family, the manual adjustment and testing of each machine and the production line should be properly arranged, that is, the influence of manual intervention. Enterprises should determine the degree of manual intervention in the process flow based on their own technical equipment capabilities, technical level, and technical transformation investment, which determines the level of automation and functional requirements for the selection of CNC machine tools. It is necessary to objectively consider the appropriate use of manual adjustments to complement the ability of the enterprise to achieve full automation, and to accurately position the company's technological capabilities and equipment levels.

Third, the selection of the main features of CNC machine tools

The machine tool specification should include the model, machine specifications, and the main motor power. Under the premise of determining the technological content, the choice of model is more clear. For example, the main parts of rotary body parts processing can be lathes, turning centers, CNC grinders, etc.; the processing of boxes should be based on vertical or horizontal machining centers.

CNC machine tools have developed into a wide variety of goods for a wide range of choices. The selection of models should be as simple as possible to meet the processing requirements. For example, turning centers and CNC lathes can machine shaft parts, but the price of a turning center that meets the same processing specifications is several times more expensive than a CNC lathe. If there are no further process requirements, selecting a CNC lathe should be reasonable. In the processing cavity mold parts, the same specifications of the CNC milling machine and machining center can meet the basic processing requirements, but the difference between the two machine tools prices 20% - 50%, so the process in the mold processing tool to be used often can be arranged Selecting a machining center, an optional CNC milling machine that fixes a tool for long-time milling.

The most important specifications of CNC machine tools are the range of the several CNC axes and the spindle motor power. The three basic linear coordinate (X, Y, Z) strokes of the machine tool reflect the allowable machining space of the machine tool. In the lathe, two coordinates (X, Z) reflect the size of the allowable rotary body. In general, the contour size of the machined workpiece should be within the machining space of the machine tool. For example, if the typical workpiece is a 450 mm × 450 mm × 450 mm box, then the machining center with a table size of 500 mm × 500 mm should be selected. The use of a table top slightly larger than a typical workpiece is considered for mounting fixtures. The working table size of the machine tool and the three linear coordinate travels have a certain proportional relationship. For example, for the above-mentioned workbench (500 mm×500 mm), the x-axis travel is generally (700-800) mm, and the y-axis is (500- -700)mm, z axis is about (500-600)mm. Therefore, the size of the work surface basically determines the size of the machining space. In some cases, the workpiece size is also allowed to be larger than the coordinate stroke. At this time, the processing area on the part must be within the range of the stroke, and the allowable bearing capacity of the machine table must be considered, and whether the workpiece should be exchanged with the machine tool for space intervention of the cutter. Problems such as interference with accessories such as machine guards.

The main motor power of CNC machine tools can also have various configurations on the same type of machine tools, which generally reflects the cutting rigidity and high-speed performance of the spindle. For example, the power of a spindle motor of a light machine may be 1 to 2 smaller than that of a standard machine. At present, the general machining center's spindle speed is (4000-8000)r/min, the high-speed machine vertical machine tool can reach (20000-70000) r/min, and the horizontal machine tool (10000-20000) r/min, its spindle. The motor power has also multiplied. The spindle motor power reflects the cutting efficiency of the machine tool and reflects the cutting rigidity and the overall stiffness of the machine from another side. In the modern small and medium-sized numerical control machine tools, the mechanical shift of the spindle box has been less used, often using the direct current main shaft of alternating current and adjustable speed motor with large power, and even adopting the electric spindle structure. This structure is limited in the torque at low speed, that is, the output power of the speed-regulating motor decreases at low speed. In order to ensure low-speed output torque, it is necessary to use a high-power motor, so the spindle motor of the CNC machine tool of the same specification is several times larger than the ordinary machine tool. When there are a lot of low-speed machining on some typical workpieces using the unit, the low-speed output torque of the selected machine must also be checked. Lightweight machines are definitely cheaper in price, requiring users to comprehensively select machine tools based on their typical workpiece blank stock size, cutting capacity (metal removal per unit time), required machining accuracy, and what kind of tool can actually be configured.

In recent years, the trend of high-speed CNC machine tool development is rapid, the spindle from thousands to tens of thousands of revolutions per minute, linear coordinate rapid movement speed from (10 - 20) m / min rise to 80m / min or more, of course, machine tool prices Correspondingly, users must make reasonable choices based on their technical capabilities and supporting capabilities. For example, the maximum spindle speed on a vertical machining center can reach (50000 - 80,000) r/min. In addition to some processing special cases, the general matching tool is very expensive. Some high-speed lathes can reach (6000 - 8000) r/min or more, and the configuration requirements of turning tools are also high.

For a small number of special workpieces, processing on only three linear coordinates can not meet the requirements. To increase the rotary coordinates (A, B, C) or additional work coordinates (U, V, W), etc., these requirements can be satisfied in the current machine tool market. However, the price of machine tools will increase a lot, especially for some requirements of multi-axis linkage processing, such as four-axis, five-axis linkage processing, must be a comprehensive consideration and arrangement of the corresponding supporting programming software, measurement methods.

Fourth, the choice of machine tool accuracy

The accuracy requirements of key parts of a typical part determine the accuracy grade of the selected CNC machine. The numerical control machine tools are divided into simple type, full-function type, ultra-precision type, etc. according to their purposes. The accuracy they can achieve is also different. The simple type is also currently used for some lathes and milling machines. The minimum movement resolution is 0.01mm, and the movement accuracy and machining accuracy are all above (0.03 - 0.05) mm. Ultra-precision type for special processing, its accuracy can reach 0.001mm or less. This section mainly discusses the most widely used full-function CNC machine tools (mainly based on machining centers).

According to the precision can be divided into ordinary type and precision type, general CNC machine tool accuracy test items have 20 - 30 items, but its most characteristic items are: single axis positioning accuracy, single axis repeat positioning accuracy and two axes or more linkage processing The roundness of the test piece.

Positioning precision and repeat positioning accuracy comprehensively reflect the comprehensive accuracy of the moving parts of the axis. In particular, the repeated positioning accuracy reflects the positioning stability of the shaft at any positioning point within the stroke. This is a basic index to measure whether the shaft can work stably and reliably. At present, the software in the numerical control system has a rich error compensation function, which can stably compensate system errors in each link of the feed chain. For example, factors such as gap, elastic deformation, and contact stiffness in each link of the transmission chain, they often reflect different instantaneous movements as the size of the table load, the length of the movement distance, and the speed of the moving positioning. In some open-loop and semi-closed-loop feed servo systems, the mechanical drive components after the measuring element are affected by various accidental factors and also have considerable random error effects, such as the actual positioning position of the table caused by the heat elongation of the ball screw. Drift and so on. In short, if you can choose, then choose the device with the best repeat positioning accuracy!

Milling cylindrical surface accuracy or milling space spiral groove (thread) is a comprehensive evaluation of the machine tool CNC axis (two-axis or three-axis) servo follow-up motion characteristics and numerical control system interpolation function indicators, the evaluation method is to measure the cylindrical surface processing circle degree. In the test cutting parts of numerically-controlled machine tools, there is milling quadrilateral milling processing method, which can also determine the accuracy of two controllable axes during linear interpolation. In making this test cut, the end mill used for finishing is mounted on the spindle of the machine tool and the circular test piece placed on the workbench is milled. Generally, the round test piece of the small and medium-sized machine tool is taken in Ф200-Ф300. , Then place the cut test piece on the roundness meter and measure the roundness of the machined surface. There is a pronounced cutter chatter on the cylindrical surface that reflects the machine tool's interpolation speed is not stable; the milled roundness has a significant elliptic error, and the gains of the two controllable axis systems that reflect the interpolation motion do not match; on a circular surface There is a stop point mark at each point where the movement of the controllable axis changes direction (in a continuous cutting motion, when the feed motion stops at a certain position and a small amount of metal cuts are formed on the machining surface) , reflecting that the forward and reverse clearance of the shaft is not adjusted well.

Single axis positioning accuracy refers to the error range when positioning at any point within the axis travel. It directly reflects the machining accuracy of the machine tool, so it is the most critical technical indicator of CNC machine tools. At present, the specifications, definitions, measurement methods, and data processing of these indicators vary among countries around the world. In the description of various types of numerically-controlled machine tools, the commonly used standards include the American Standard (NAS) and the American Machine Tool Manufacturers Association’s recommendations. German Standard (VDI), Japanese Standard (JIS), International Organization for Standardization (ISO) and Chinese National Standard (GB). The lowest standards in these standards are the Japanese standards, because its measurement method is based on using a single set of stable data, and then removes the error value by half using a ± value, so the positioning accuracy measured by its measurement method is often lower than The difference measured by other standards is more than doubled.

Although several other standards differ in processing data, they all reflect the need to analyze the measurement positioning accuracy according to the statistical laws of error, that is, for a certain positioning point error in the travel of a controllable axis of a CNC machine tool, it should reflect that Later in the long-term use of the machine thousands of times in this positioning error, and we can only measure a limited number of times in the measurement (usually 5 - 7 times).

Fifth, the choice of CNC system

With the diversification of market demands, machine tool manufacturers often provide the same machine with a variety of numerical control options or multiple choices in the numerical control system.

The CNC system provided by the machine tool builder is divided into mainstream system and adaptable system. The mainstream system is relatively mature in terms of technology, but users should have other requirements, such as the pursuit of the quality of the brand name system, and hope There are better technical conditions for after-sales service in China, and the number of CNC systems used in user units is relatively concentrated on several requirements, so that users can use the NC system that they are trustworthy or familiar with.

In the alternative system, the performance varies greatly, directly affecting the equipment price structure. Therefore, it is not possible to unilaterally pursue high-level and new systems, but rather to meet the performance of the main equipment, and to make a comprehensive analysis of the system performance and price, etc. Use the right system. The world's most famous numerical control systems include Japan's FANUC, Germany's SINUMERIK, France's NUM, Italy's FIDIA, Spain's FAGO, and the United States' AB. Major machine tool manufacturers also have their own systems, such as MAZAK, OKUMA and so on. Domestically, there are also suppliers of CNC systems such as Aerospace Group, Electromechanical Group, Huazhong University of Science and Technology, Liaoning Blue Sky, Nanjing Dafang Group, and Northern Catcher. Each company also has a series of products of various specifications.

The basic principle of the user's selection system is: higher performance to price ratio, easier use and maintenance after purchase, longer system life (you can't choose the elimination system, otherwise you won't find maintenance spare parts after a few years).

In addition to the basic functions of the CNC system, there are many options available. For the system equipped with the machine tool, the CNC system selection function required by the basic requirements of the machine tool has been selected by the manufacturer, and the user can additionally select some according to their own production management, measurement requirements, tool management, program preparation requirements, etc. Functions are listed on the order form, such as DNC interface networking requirements.

Sixth, automatic tool changer (ATC), automatic exchange table (APC) and handle selection configuration

1. The choice of ATC

On some CNC machines with comprehensive processing capabilities, such as machining centers, turning centers, and numerical control punches with exchange punches, the automatic exchange device is the basic feature attachment of these devices. Its work quality is directly related to the quality of the entire machine. It also constitutes an important part of the equipment investment (funds account for 10% to 30% of the total cost of the equipment). Therefore, when selecting a host device, the quality of work and tool storage of the ATC automatic tool changer must be valued. At present, the matching of the automatic tool changer of the machining center is relatively standardized. The following describes the selection principle of the ATC device of the machining center as an example.

Field experience shows that about 50% of the use of machining centers is related to ATC devices, but ATC is also an essential component to improve the processing efficiency of equipment. Therefore, users are advised to use structures that are simple and reliable as far as meeting the requirements of use. High-level ATC can also reduce the overall price accordingly.

The following describes the main technical parameters related to the ATC device.

(1) Handle type

The model of the tool holder depends on the size of the shank hole in the machine tool spindle. At present, the majority of machining center spindles of machine tools adopt the 7:24 taper hole specified by ISO. Commonly used are No. 40, No. 45 and No. 50, and individual No. 30 and No. 35. The smaller the machine size is, the smaller the tool holder size should be, but the smaller size holder is not good for machining large-size holes and long holes. Therefore, if a machine tool has a large-sized tool holder, it should be selected as large as possible. , but the magazine capacity and tool change time must be affected. In recent years, machining centers and numerically controlled milling machines have developed in the direction of high speed. Many experimental data show that when the spindle speed exceeds 10000r/min, the 7:24 taper hole will have a certain increase due to centrifugal force, which affects the positioning accuracy of the shank. For this reason, one view is suggested to adopt the HSK series of short taper shank recommended by German VDI. In addition, over-positioning taper shank of the cone surface and the end surface of a part of goods that have been in contact in Japan at the same time, but at the centering accuracy and repetition In terms of positioning accuracy, the HSK series is better, and currently there are few manufacturers in China.

There are Japanese BT standard, American CAT standard, German VDI standard, etc. for the same taper specification holders. They require that the size of the gripper grip is not the same and the gripper's tightening nail size is not the same, so the selection must be considered Completely, users who already have a certain number of CNC machine tools or who are about to purchase a number of CNC machine tools should choose the single-standard tool holder series that can be used universally.

(2) Tool change time

The tool change time is the tool change time, that is, the total time for replacing the used tool from the spindle and installing a new one. There are two methods for subdivision, namely, Tool to tool and Chip to chip. The total tool change time includes the old tool's finished machining and the tool's swapping completed. The time between the new tool entering the new process. At present, the fastest pure tool change time is about 0.7s. The total tool change time is between 3 and 12s. The vertical tool change time is generally shorter than that of the horizontal type. The short tool change time means high machine tool productivity.

(3) Maximum tool weight

The maximum tool weight refers to the maximum tool weight allowed in the case of automatic tool exchange. The maximum allowable weight of the taper around 40 degrees is 7-8 kg, the 15th handle is 15 kg, and some heavy tools are 25-30 kg. At this time, the tool change speed will slow down. The maximum tool diameter and length are mainly limited by the size of the magazine.

(4) Magazine capacity

The capacity of the magazines configured on the machine tools of some machining centers often has several specifications for selection. There are a dozen to 40, 60, 100, etc., and some flexible machining units (FMC) have a tool storage capacity of nearly 1,000 after the central magazine is configured. As long as the capacity of the tool magazine can meet basic needs, it is generally not appropriate to select too large, because of its large capacity, high tool magazine cost, complicated structure, and correspondingly increased failure rate, and tool management is also more complicated. In the use of a single machine tool, when replacing a new workpiece, the operator should clean the tool magazine according to the new process data. The more irrelevant tools in the tool magazine, the greater the amount of work to be done. The more prone to human error. Therefore, the user should generally calculate the number of tools required to determine the capacity of the tool magazine based on the process analysis of a typical workpiece. If it is not considered as a flexible machining unit or a flexible manufacturing system, the tool magazine of a general machine tool is selected based on the number of all the tool holders required for one-time workpiece clamping. According to the foreign technology analysis of processing typical workpieces in small and medium-sized machining centers, it is considered that the storage capacity of small and medium-sized machine tools should be between 4 and 48.

In the machine tool incorporating the flexible manufacturing unit, it is necessary to configure a large-capacity tool magazine in consideration of the requirement of adapting multiple workpieces and multiple processes at the same time, and corresponding tool management measures should be added at this time.

2 handle and tool selection

After the master and automatic tool changer (ATC) are determined, select the desired tool holder and tool (cutting tool). The series of handles used in CNC machine tools have basically been standardized, especially the handles used in machining centers, such as CAT in the United States, BT in Japan, and JT in China. The final processing of CNC machine tools depends on the cutting tool. However, the connection between the tool and the machine tool, and the clamping part provided to the robot when the tool is automatically exchanged must be solved by the tool holder. Therefore, the tool is essentially a tool and a tool. Handle configuration. The choice of cutting tool depends on the processing technology requirements. After the cutting tool is determined, the corresponding tool holder must also be configured. For example, if the process requires drilling a small hole with a diameter of 6 mm, then the cutting tool uses a 6 mm diameter straight shank twist drill, and then a drill bit can be used to hold the drill bit. Tool holder. Some of the shanks are now equipped with special cutting tools such as fine boring tools. In short, most of these attachments have already been standardized and are supplied by specialized production plants. The machine tool user must use a reasonable choice according to the specific processing object. As the range of available handles is very wide, more investment will increase the investment and the selection will reduce the operating rate of the machine tool, so it should be treated with caution.

For some workpieces with a total batch size of more than a few thousand and repeatedly put into operation, composite tools can be considered in the process arrangement, that is, the main cutting power of the CNC machine tool is used, the machine tool stiffness is better, and the compound tool is used for multi-tools. Powerful cutting with multiple blades increases productivity and reduces cycle time. However, a composite tool is much more expensive and becomes a special tool. It must be considered economically if there is a sufficient number of parts.

In recent years, many new products have been developed on the tools used in CNC machine tools, which have greatly enriched the processing technology of CNC machine tools, such as universal vertical milling heads, reverse scraping tools, deburring tools, speed increasing heads, thread milling cutters and internal cooling. Tools, etc. (See product sample for details).

3 automatic exchange workbench

The automatic exchange workbench is an accessory configured on the host. The number of configurations is 2, 4, 6, and 10, and is mainly configured by a flexible manufacturing unit except the double exchange worktable. The configuration of the double exchange table can greatly save the auxiliary time for the loading and unloading of complex parts, and increase the starting rate of the machine tool. However, with the increase of the functional equipment, the investment must be at least 100,000 yuan. A large number of exchange tables are used in flexible manufacturing units. They are suitable for 24-hour personnel or unmanned management. They can adapt to multiple types of workpieces to be alternately put into operation. Attention should be paid to increasing quality inspection measures. Otherwise, the investment will increase by 20%—50% is not. Economy.

Seven, the choice of machine tools and accessories

In the selection of CNC machine tools, in addition to the basic requirements of the basic functions and functions, it should also fully consider the choice of parts selection function and accessories. The principle of selection is: comprehensive configuration, giving full play to the maximum potential of the host and comprehensive consideration of the near-term benefits. For some prices increase is not much, but the use of a lot of convenience, should be configured as far as possible. Attachment support should ensure that the machine tool can be put into use immediately after it arrives on the site. Never use a machine tool that costs several tens of thousands of yuan or even several millions to buy. After the arrival of the machine tool, it cannot be used for a long time due to the lack of an annex of tens or hundreds of yuan. happened.

The selection function of the numerical control system should be based on practicality, not necessarily selected too much, especially the equipment included in the mass production line should be as simple as possible, and the selection of programming functions should be strengthened for the machine tools with multiple varieties and small batch production methods. Random programming (background programming), motion graphics display, human-computer dialogue programming (GPS), macro programming, etc., although it can speed up programming, but the cost must be increased accordingly. Another configuration scheme is to simplify the function of programming CNC system programming, separately configure the automatic programming machine and the communication interface with the CNC system. The program processing is done on the programming machine in advance, and then it takes a few minutes to enter the CNC system. , This can further increase the starting rate of the machine tool.

Many accessories such as automatic measuring devices, contact probes and corresponding measurement software, tool length and wear detection, machine tool thermal deformation compensation software and other accessories have also been developed to improve the processing quality and work reliability. The selection principle of these attachments is to require work. Reliable, not one-sided pursuit of novelty. For some auxiliary function accessories, such as cooling, protection and chip removal devices, etc., mainly based on future requirements and process requirements in the field, for example, consider the need to process a large amount of cast iron parts later, you must use a high sealing shield, large Flow shower cooling method, paper coolant Filter device, etc. In short, we must choose accessories that are compatible with production capacity.

Eight, technical services

As a high-tech product, CNC machine tools include multi-disciplinary professional content. It is not enough to apply and maintain the application of such complex technical equipment. Rely on and use professional teams in society. Therefore, in the purchase of equipment should also be comprehensive consideration to purchase its pre-sales, after-sales technical services around the equipment, its purpose is to make equipment as soon as possible to play a role.

For some new CNC machine users, the most difficult problem is not the lack of funds to purchase equipment, but the lack of a high-quality technical team, so new users from the beginning of the selection of equipment, including the arrival of equipment after the installation acceptance, equipment Operations, programming, mechanical and electrical maintenance all require talent and technical support. It is very difficult for these conditions to be solved by the user within a short time. At present, each machine tool manufacturer has paid great attention to the pre-sales and after-sales services of the products, assisting the users in the process analysis of typical workpieces, the feasibility testing of the processing, and the commitment of complete sets of technologies. Services, including the development of process equipment, programming, installation and commissioning, and testing of workpieces, until the full production of the rapid response to warranty service, for users of various types of technical personnel training.

In short, CNC machine tools can be used rationally for enterprises that attach importance to the construction of technical teams and attach importance to improving the quality of employees. Therefore, when selecting a machine tool, it is recommended that users spend a portion of their funds to purchase technical services that are in short supply for themselves so that the equipment can function as quickly as possible.

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