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      tips for improving the productivity of CNC machine tools

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      tips for improving the productivity of CNC machine tools

      Release date:2019-11-22 00:00 Source:http://www.sxjbzy.com Click:

      In the actual production process, we will find that the same CNC machine tools are operated by different people, and the production efficiency varies greatly in the same working time. The processing capabilities of many CNC machine tools are not fully reflected and cannot play their best role. . In the process of use, only by fully considering all factors that affect the production efficiency of CNC machine tools, and trying to improve the production efficiency of CNC machine tools, can the production capacity of CNC machine tools be brought into full play.

      CNC machine tools



      1. Formulate a reasonable processing technology route to reduce the auxiliary time of CNC milling

      In order to improve the production efficiency of CNC machine tools, we must first carefully analyze the parts processed by the CNC machine tools, and clarify the technical requirements in terms of materials, structural characteristics, shape and position tolerance requirements, roughness, and heat treatment of the parts. Then on this basis, choose a reasonable milling process and a simple processing route.

      Formulation of processing technology: Generally, a part can have several different processes. The processes of parts are different, and their production efficiency, processing cost, and processing accuracy are often significantly different. Therefore, we should ensure the quality of parts according to the premise of The specific conditions of production, try to increase production efficiency and reduce production costs, and work out a reasonable processing technology.

      Determination of processing routes: Correct and concise processing routes are the basis for ensuring processing quality and improving efficiency. When selecting the processing route of a part, the principle of determining the processing route must be followed to achieve the purpose of improving production efficiency. The main principles for determining the machining route are as follows: the machining accuracy and surface roughness requirements of the part should be guaranteed, and the efficiency should be high; the machining route should be minimized as much as possible, which can reduce the program segment and reduce the idle travel time of the tool ; The numerical calculation should be simple and the number of blocks should be small to reduce the programming workload. In addition, when determining the processing route, the machining allowance of the workpiece and the rigidity of the machine tool and the tool must also be considered, and it is determined whether the machining is performed in one pass or multiple passes. At the same time, it should try to achieve one clamping, multi-directional processing, and one-time processing. In this way, the number of times the workpiece is installed can be reduced, and the time for handling and clamping can be effectively reduced. In this way, both the processing efficiency can be effectively improved and the position accuracy requirements of the parts can be well guaranteed.

      2.Select the right tool to improve the cutting efficiency of CNC milling machine

      Selection of tools should take into account factors such as the machining capacity, process content, and workpiece materials of the CNC machine. The tools selected for CNC machine tools not only require high hardness, high wear resistance, sufficient strength and toughness, high heat resistance and good workability, but also require stable dimensions and convenient installation and adjustment. Therefore, new high-quality materials should be used to manufacture CNC machining tools, and the tool parameters should be optimized so that the size of the tool is compatible with the surface size and shape of the workpiece being processed. So, how to choose the right cutting tool?

      (1) Select the appropriate tool

      In the cutting process of CNC machine tools, the role of metal cutting tools is extremely important. The materials used to make the tools must have high hardness, abrasion resistance and heat resistance, sufficient strength and toughness, good thermal conductivity and processability, and good economics. In the process of selecting tools, on the premise of meeting the processing requirements of parts, try to choose a tool with a larger diameter, which has better strength and toughness. In the same process, use as few tools as possible to reduce the number of tool changes; It is possible to choose a universal standard tool instead of special non-standard tools.

      (2) Reasonably determine the tool setting point

      Tool setting point is the starting point of tool movement relative to the workpiece when machining a part on a CNC machine. Also called "program start point" or "start point". The selection of tool points must comply with the following principles: easy to use digital processing and simplified programming; easy alignment on the machine tool, easy processing inspection; small processing errors caused. The position of the tool setting point can be selected on the workpiece or outside the workpiece (such as on a fixture or a machine tool), but it must have a certain dimensional relationship with the positioning reference of the part. The tool setting point should be selected as far as possible on the design or process basis of the part. For workpieces positioned with holes, the center of the hole can be used as the tool setting point. The position of the tool is aligned with this hole, so that the "in place" and the "tool setting point" coincide. In this way, you can better improve the efficiency of tool setting and ensure the processing quality.

      3. Reasonably install and clamp the workpiece to improve the clamping speed

      When machining a workpiece on a CNC machine tool, the positioning and installation of the workpiece should strive to unify the design benchmark, process benchmark, and programming calculation benchmark; minimize the number of clampings, and process all the surfaces to be processed after positioning and clamping as much as possible; avoid Adopt the manual adjustment processing scheme of the machine to make full use of the effectiveness of the CNC machine tools.

      When cutting CNC machine tools, we must fully consider the issues of positioning, clamping design and selection and design of furniture. When designing furniture, first make sure that the coordinate direction of the furniture is relatively fixed to the coordinate direction of the machine tool. Second, coordinate the dimensional relationship between the part and the machine coordinate system. At the same time, you should also consider:

      (1) When the production volume of parts is not large, combined fixtures, adjustable fixtures and general fixtures should be used as much as possible to shorten production preparation time and save production costs;

      (2) Only consider the use of special fixtures in batch production, and strive for simple structure;

      (3) The loading and unloading of parts must be fast, convenient and reliable, so as to shorten the machine downtime;

      (4) Each part on the fixture should not hinder the machine tool from processing the various surfaces of the part;

      (5) When selecting tooling, it should facilitate tool exchange and avoid interference and collision;

      (6) Multi-position and multi-piece fixtures can also be used in batch production to improve processing efficiency.

      4. Reasonably select the cutting amount to improve the removal efficiency of the machining allowance

      Cutting amount includes: spindle speed, cutting depth, feed rate. When selecting the cutting amount of CNC milling machine, if it is rough machining, it is generally based on improving productivity. However, it is also necessary to consider economy and machining costs. You can choose a larger cutting depth and feed rate. On the premise of guaranteeing the processing quality, efficiency, economy and processing cost should be taken into account; the cutting tool should be set to the highest possible feed speed. The specific value should be determined according to the machine manual, cutting amount manual, and experience.

      5. Implement tool presetting and automatic wolf measurement to reduce the adjustment time of the machine

      Many different tools are often used in the processing of CNC machine tools. If the tools cannot be adjusted in advance, the operator needs to install each tool on the spindle and slowly determine their exact length and diameter. Then, it is manually input through the keys on the CNC control surface. If a tool setting instrument is used, it can accurately measure the diameter and length of the tool, reduce the machine tool occupation time, increase the first piece qualification rate, and greatly improve the production efficiency of the CNC milling machine.

      6. Flexible use of various auxiliary functions and macro programs of CNC machine tools

      NC machine tools have tool radius and length compensation functions. The tool compensation method can be used to compensate for tool size errors. Layered milling and rough and fine machining can be achieved with the same machining program or used to improve machining accuracy. The same machining program can be used to process matching parts.

      The biggest feature of using macro programs is to express the regular shape or size with the shortest program, and when the machine tool executes such programs, it is faster and faster than the programs generated by CAD / CAM software. Macro programs can use variables and assign values to variables. Variables can be calculated. Program execution can be jumped to form a modular processing program. In the application, only the part information and processing parameters need to be entered into the calling statement of the corresponding module. Reduce programming and entry time.

      CNC machine tools also have fixed cycle functions, subroutine functions, mirror processing functions, and rotating light functions. Using these functions can eliminate the input of long programs, and use them properly to taste the effect of getting more with less.

      7. Correctly maintain the machine tool and prolong the MTBF of CNC machine tools

      CNC machine tools are mechanical, electrical, hydraulic, pneumatic, computer technology, control technology, detection and measurement technology, electric drag technology, PLC and other technology-intensive products. The user's usual normal maintenance of CNC machine tools, timely troubleshooting and timely repair, can prolong the service life of various components, CNC systems and various devices, prevent accidents other than accidents, and give full play to machine tool performance and long-term stability. Basic guarantee of work. Therefore, the automatic lubrication system should be regularly inspected and cleaned, and grease and oil should be added or replaced, so that moving parts such as screw rods and guide rails can always maintain a good lubrication state and reduce the rate of mechanical wear. Regularly check the accuracy of machine tools and adjust if necessary; When the filter, air filter, etc. are too dirty, the phenomenon of insufficient pressure, poor heat dissipation, etc. will cause failures. Therefore, regular sanitary cleaning and cleaning and rust prevention work must be performed; machine tools are not full or do not use for a long time, they should be regularly Turn on the machine and let it run for a while.

      8. Strengthen information construction and personnel training to improve the use efficiency of CNC machine tools

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