What factors affect the accuracy of a punch

        A punch is a precision machine. Since the accuracy of a punch is achieved through the accuracy of each part of the punch, the error of any part will expand the accuracy of the punch by multiples. The operating principle of the punching machine: the mechanical punching machine is driven by the electric motor to drive the flywheel to accumulate the force. The flywheel transmits the force to the crankshaft, and the crankshaft converts the force of circular motion into the force of vertical motion. This force pushes the slider to do work, thereby processing the workpiece .SINGLE POINT PRESS

　　The accuracy of the punch body. First of all, set sail from the machine body data. The punch body provides support, fixation, and stability for the normal operation of the punch. The rigidity and stability of the machine body have the greatest impact on the accuracy of the press. The punch body is generally processed by two processes, steel plate welding and cast steel. No matter which method is processed, the fuselage needs to be subjected to stress relief. Part of the stress relief is to ensure the overall strength of the welded fuselage, and the weld is not easy to crack, and it also makes the fuselage easier to machine. The advantage of the steel plate welding machine body is the use of steel plate for welding, which is more flexible and easier to process than casting. It is easier to meet the customization requirements of non-standard users. The open structure punching machine will generally weld C type at the guide rail. Cast steel is used to ensure its strength. Since some large-tonnage presses cannot be cast, steel welded bodies are mostly used for large-tonnage presses, including some low-speed precision presses. The cast-steel fuselage is moulded and integrally formed. Due to the selection of the casting method, the interior has a more special structure, which makes the fuselage more effective in absorbing resonance than the steel welded fuselage. At the same time, because it is integrally formed, the stability is stronger than that of the steel welded body. Affected by the processing technology and the difficulty of reprocessing, the cast body can generally only be used on small-tonnage punches and high-speed precision punches, such as the ZYJ punch and JB23 punch of Zhongya Machine Tool, as well as J21 and J21S. Made with cast steel body. In terms of accuracy alone, both types of fuselage can guarantee the accuracy requirements of the machine. But the two differ in their application planning due to their respective special functions.DOUBLE POINT PRESS

　　The material of the fuselage is the first element to ensure accuracy. Secondly, the excellent processing technology is also the key factor that makes the material change suddenly.PUNCHING AND FOLDING MACHINE PRESS

　　 crankshaft gear drive shaft. Mechanical punching machines generally use gears and drive shafts for transmission, so the machining accuracy of gears and shaft concentricity, the machining accuracy of shaft holes, the accuracy and wear resistance of bearing bushes are also important factors affecting the accuracy of punching machines. The crankshaft is the punch force transformation organization and the primary force organization. The crankshaft is made of carbon steel after forging, turning, and grinding with a crankshaft precision grinder, followed by hard chromium plating and nitriding treatment. The strength, rigidity and wear resistance of the crankshaft are guaranteed.

　　 Slider and guide rail accuracy. The sliding block is the direct work part of the punching machine. Generally, cast steel is used for integral casting, or cast steel is used for milling. The precision of the slide block and the guide rail is a whole. The open punching machine generally has two guide rails. The guide rails are V-shaped and rectangular. The V-shaped guide rail is also called the four-sided guide rail. The guide rail has four contact surfaces. Rectangular rails are also called six-sided rails, and the rails have six contact surfaces. All the guide rail planes are precisely ground using a guide rail grinder, and the lever surface is used for measurement during the equipment process, and scraping is performed to ensure the accuracy of cooperation. Closed punches generally have four guide rails, and generally use right-angle guide rails. The primary reason that affects the accuracy of the slider and the guide rail is the machining accuracy and equipment technology.PUNCHING PRESS

　　 Slider balancing equipment. When the punching machine is processing, the sliding block drops, and after the work is finished, it will encounter the counter-effect force of the mold. The counter-effect force and the error of the guide rail accuracy will cause the sliding block's working track to undergo subtle changes. After installing the slider balancing device, the slider and the guide rail can be made to work in parallel.

　　The bottom surface of the slider and the accuracy of the worktable. The upper mold of the slide block bottom equipment, the lower mold of the workbench equipment and other feeding and unloading equipment. The materials of the two working platforms are made of cast steel material or cast steel plate. After casting, the milling machine is first used for milling, and then the surface grinder is used for grinding to ensure its accuracy. The equipment needs to be measured with an instrument, and the fault is found to be scraped and adjusted in time.

　　 Punch equipment environment and shock absorption footing. Large-tonnage punches, precision punches, and high-speed punches need to cast anti-vibration pits at the time of the equipment. Different punches are poured according to the orientation of their equipment holes. Small-scale punches generally use shock-proof footing for equipment.FRICTION SCREW PRESS

　　 Punch equipment technology. The quality of equipment technology directly determines the accuracy of the punch. Fifty percent of the victory or defeat of a punch press is due to equipment technology. The final assembly needs to combine all the precision components into one piece. Each component cannot be guaranteed to be 100% precise. Assuming that the permitted fault of the slider is 2 and the permitted fault of the crankshaft is 3, then the fault of their combination is not 2+ 3 is 2*3, so the final fault is 6. If the fault of 2 occurs when the device is used, the overall fault will reach 12. Therefore, if the fault occurs in the device, the overall fault will be doubled and the overall fault will be doubled. The precision.PUNCHING PRESS

　　 The correct maintenance of the punch. 1. During the operation of the punch press, it should be smoothed strictly in accordance with the product manual, punctually check whether the storage of smooth oil is sufficient, and check whether the smooth oil circuit is unblocked. 2. In the process of using the punch press, always pay attention to whether there is abnormal noise or abnormal movement of the machine tool, whether there is abrasion on the slide rail, and the bearing bush. 3. If the accuracy is found to be reduced, the machine should be shut down for maintenance immediately.FIXED TABLE PRESS

        The accuracy of the punch is attributed to an overall accuracy, which is guaranteed by all the precision parts coordinated together. Any guarantee of the accuracy of only one part and several parts is not advisable.