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What are the basic properties of tool materials for precision parts machining The tool material for precision parts processing refers to the material of the cutting part of the tool. In metal cutting, the cutting part of the tool directly contacts with the workpiece and cutting parts, bears a lot of cutting pressure and impact force, and has serious friction with the workpiece and cutting parts, which leads to the increase of cutting temperature. This means that the cutting part of the tool works under the harsh conditions of high temperature, high pressure and severe friction to master the basic properties of the tool material. What are the basic properties of tool materials? 1. High hardness. The hardness of the tool material must be higher than that of the workpiece material to be machined. Otherwise, under high temperature and high pressure, the sharp geometric shape of the tool cannot be maintained, which is the basic property of the tool material. 2. Sufficient strength and toughness. The material in the cutting part of the tool must bear a great cutting force and impact force when cutting. 3. High wear resistance and heat resistance. The wear resistance of tool materials refers to the ability to resist wear. Generally speaking, the higher the hardness of tool materials, the better the wear resistance. The wear resistance of tool materials is also related to the metallographic structure. The more carbides in the metallographic structure, the finer the particles, the more uniform the analysis, and the higher the wear resistance. 4. Good thermal conductivity. Tool materials with good thermal conductivity can also enhance their heat shock resistance and thermal cracking resistance, which is very important for intermittent cutting with brittle tool materials, especially when machining workpieces with poor thermal conductivity. 5. Good processability. In order to facilitate manufacturing, tool materials are required to have good machining performance of precision parts, including forging, welding, cutting, heat treatment and grindability. 6. Better economy. Economy is one of the main indexes for evaluating new tool materials, and also one of the main bases for correctly selecting tool materials and reducing product costs. 7. Adhesion resistance and chemical stability. The above points are the properties that precision parts should have when machining tool materials. The selection of tools, especially when machining more precise parts, is very strict, so as to meet the processing requirements and give full play to the benefits of CNC lathes

What is the tool setting point for precision parts processing, and what are the selection principles? The tool setting point refers to the starting point of the cutting movement of the tool relative to the part during the machining of precision parts. The following seven principles apply to the selection of tool setting point position: 1. Try to keep consistent with the dimension design datum or process datum of the workpiece. 2. The preparation of processing program shall be as simple and convenient as possible. 3. It is convenient to use conventional measuring tools and gauges for alignment on the machine tool. 4. At this time, the tool setting error should be small, otherwise the possible processing error should be minimum. 5. Try to make the lead in (or return) route in the processing program short and easy to change the rotary tool. 6. Select a position compatible with the agreed mechanical clearance state of the machine tool (eliminate or maintain the maximum clearance direction) to avoid causing (reverse compensation) when performing its automatic compensation. 7. If necessary, the tool set point can be set on an element of the workpiece or its extension, or on a position of the fixture that has a certain coordinate relationship with the workpiece positioning datum. There are many methods to determine the position of tool setting point for precision parts processing. The machine tool with fixed origin can be determined through manual and display functions. For machine tools without fixed origin, displacement conversion algorithm and simulation positioning method or approximate positioning method can be used according to the determined accuracy requirements.

Features of CNC lathes:   1, high processing precision. CNC machine tools through the control system to give instructions for processing, so it can achieve very precise machining accuracy.   2, high degree of automation, low labor intensity. CNC machine tools are automatically completed according to the pre-programmed program, do not need too much manual complex manual operation, greatly reduce the intensity of labor.   3. High production efficiency. Each process of CNC machine tools can choose the most favorable cutting amount, its structure rigidity is good, allow for large cutting amount of strong cutting, improve cutting efficiency, can greatly save time to improve production efficiency.   4. Good economic benefits. Although the price of CNC machine tools is more expensive, but high precision, scrap rate is less, so its economic benefits are high. The application of CNC machine tools   1, suitable for more complex parts processing   2, suitable for multi-variety, small batch parts processing   3. It is suitable for processing expensive parts that are not allowed to be scrapped   4, suitable for high precision requirements of batch processing  

CNC processing is a very rigorous work, the need for operators with high quality, then CNC processing in general to follow what principles? The following is introduced by me.   1, control the length of the machining route to ensure that the shortest machining route is passed, thus reducing the empty travel time, improving machining efficiency and reducing tool loss, while arranging the shortest cutting feed route, but also to ensure the rigidity of the workpiece and machining processability and other requirements.   2. to simplify as much as possible the workload of numerical calculations in it, thus simplifying the procedure of machining. 3, for some of these reused procedures, should try to achieve through subroutines.   4、Make sure to ensure the accuracy of the machined workpiece and the roughness of the surface.

What are the common instruments in mechanical processing, the processing procedures of mechanical processing and the specific types of production of mechanical processing? The following by our Rui to introduce these specific knowledge for you, so that you have a more in-depth understanding of machining. 1、Machinery commonly used for machining   There are many machines commonly used for machining, including precision lathes, digital lathes, digital molding grinders, digital milling machines, universal grinders, internal grinders, external grinders, EDM machines and other equipment, all of which can process turning, milling, planing, grinding, etc., and the precision of processing can be as high as 2um.   2、Machining process   The machining process is an automated and integrated process controlled by the control system. The machining process includes the transportation and preservation of raw materials, the processing of production equipment, the processing of blanks, the processing and heat treatment of parts, and the deployment of products. 3、Production types of machining   The production types of machining can be divided into three categories, including single batch production, batch production, mass production. Single production is well understood, where the difference between batch and mass production is that batch production when producing and manufacturing the same parts, mass production means that often to repeat the production of the same parts, manufacturing large quantities. Technicians choose different processing methods, equipment, etc. depending on the type of production of the part.

CNC technology is an automation technology that is closely integrated with CNC machine tools, and is controlled by a digital control system to achieve automation. CNC machine tools are mainly used for processing complex and tight small batch parts processing. CNC technology is based on the need to be processed parts of the drawings and processes compiled into a code of the program through the CNC system to control the relative movement of the tool and the workpiece, so as to achieve parts processing.   Then we know the CNC machine tool is the core of the CNC device through the CNC system to achieve, so what are the advantages of CNC technology processing in the end? The following by me to introduce you to the advantages of CNC technology processing:  1, its wide range of application, with a high degree of flexibility, able to process different types of different batches of parts;.   2, through automation to achieve the processing of parts can achieve high efficiency parts processing.   3, high precision, CNC technology processing is based on pre-programmed processing, can ensure the accuracy of processing.   4, good stability, the CNC machine itself is very good rigidity, and has a very high precision, so it can ensure long-term stable processing.

First, the principles of the division of the process   1, to divide the process by the way the parts are clamped and positioned   According to the technical requirements of each part and structural differences, can be divided into different processes according to the positioning method. Among them, the general processing of the shape of the part is mainly within the positioning, of course, according to the processing requirements of the parts to shape positioning.   2, according to the accuracy of processing divided into processing procedures   In CNC machining according to the accuracy of processing can be divided into roughing and finishing, that is, roughing first, in finishing. According to the different machine tools and tools for processing. Second, the principle of work step division   1、The same surface is finished in the order of roughing, semi-finishing and finishing.   2, in order to improve the machining accuracy of the bore, to follow the principle of milling the plane first and then boring the order of processing.   3、Divide the work steps according to the order of using tools, so as to reduce the number of tool changes and thus improve the machining efficiency.

First, according to the functional level of the CNC system classification   According to the functional level of the CNC system, we usually divide the CNC system into high, medium and low three gears. Of course, this is also relative, different periods will be divided into different standards. Among them, full-featured CNC or standard CNC is generally in the middle and high-grade CNC system, while the economic CNC belongs to the resisting block CNC system, its CNC system by the microcontroller and stepper motor composition, its function is relatively simple price is relatively low, mainly used in J month in the car. Second, in accordance with the processing technology and machine tool use classification   1, metal cutting machine tools, refers to the use of turning, milling, long, reaming, drilling, grinding, planing and other cutting processes of CNC machine tools. Metal cutting machine tools can be divided into two types, one is the general type of CNC machine tools, such as CNC lathes, CNC milling machines, CNC grinding machines, etc.. The other is a machining center, such as machining centers, turning centers, drilling centers, etc., whose main feature is to have automatic tool changing mechanism and tool library, continuous processing of a variety of processes automatically change tools.   2, metal forming class, such as CNC presses, bending machines, hole bending machines, spinning machines, etc., using extrusion, punching, pressing, pulling and other molding process of a CNC machine tools.   3, special processing category, mainly CNC EDM wire cutting machine, EDM forming machine, flame cutting machine, laser processing machine, etc.

1, open-loop control machine tools   The so-called open-loop control machine tool refers to the control system without feedback, the system does not have a position feedback element, usually using a stepper motor as an actuator. Input data through the numerical control system, the command pulse, through the ring distributor and drive circuit, so that the stepper motor turns a step angle, and then through the transmission mechanism to drive the table to move a pulse equivalent distance. The moving speed and displacement of the moving parts are determined by the frequency of the input pulse and the number of pulses. 2, semi-closed-loop CNC machine tools   At the end of the drive motor or at the end of the drive screw installed angular displacement detection device, through the detection of the motor or screw angle indirectly measure the actual position or displacement of the actuating parts, and then feedback to the CNC system. Obtain higher accuracy than the open-loop system, but its displacement accuracy is lower than that of the closed-loop system, and it is easy to achieve system stability compared with the closed-loop system. Now most CNC machine tools are widely used in this semi-closed-loop feed servo system, the inertia of the machine tool moving parts are not included in the detection range. 3, closed-loop control of CNC machine tools.   Closed-loop control of CNC machine tools, the harness motor can be used DC or AC two servo motors, and need to have position feedback and speed feedback, in processing at any time to detect the actual displacement of moving parts, and timely feedback to the CNC system. It is compared with the command signal obtained by the interpolation operation, and the difference as a servo harness control signal, and then drive the displacement parts to eliminate displacement errors.

1、Point position control system   The so-called point position control system is only to control the process of moving the tool from a certain point to another point, and no cutting process is performed during the moving process, and there is no requirement for the motion trajectory. But the coordinate position has a high degree of accuracy requirements. In order to improve productivity machine tools generally follow the highest feed speed for positioning movement, when approaching the positioning point to be decelerated or graded, so as to reduce the positioning error caused by inertia. 2、Linear control system   The so-called linear control system is to control the tool along a parallel to the direction of a coordinate axis, from one position to another, the movement of the route to move parallel to the machine axis, that is, the process of moving the tool can cut at a given speed, and the point position is different from the two points between the speed of movement and trajectory is set by the system. 3, contour control system   Compared with the above two control systems, the contour control system is the most complete function. It is the control of two or more coordinate axes at the same time, not only to control the starting and ending coordinates of the moving parts of the machine, but also to control the speed, direction and trajectory of the whole process. Therefore, under the contour control system, the CNC device needs to have the function of interpolation operation, through the processing of interpolation operator within the CNC system, during the movement of the tool to the workpiece surface continuous cutting, you can carry out a variety of straight line, circular arc, curve processing. Capable of two-coordinate or even multi-coordinate linkage control, but also capable of point and linear control.