A kind of punching machine and workpiece blanking method

Abstract

Provided are a punching machine and a method for punching a workpiece. The punching machine is provided with a lower die seat (7), a lower die (12), guide columns (10), an upper die seat (15), an upper die (17), a connecting plate (1), a hydraulic oil cylinder (11), a liquid supply system of the hydraulic oil cylinder (11), a PLC control system controlling the liquid supply system, a first induction switch (2), a second induction switch (3), a third induction switch (4) and a protrusion (5) connected with the upper die seat (15) or the upper die (17). When the protrusion is aligned to the induction switches, the induction switches induct signals, and the induction switches transmit the signals to the PLC control system. The punching process comprises the following circulation steps that the protrusion (5) is aligned to the first induction switch (2), and a PLC controls a piston rod to move downwards; the protrusion (5) is aligned to the second induction switch (3), and the PLC controls the piston rod to slow down to move downwards; the protrusion (5) is aligned to the third induction switch (3), and the PLC control system controls the piston rod of the hydraulic oil cylinder (11) to move upwards.

Description

technical field [0001] The invention relates to a punching machine; in particular, it also relates to a workpiece blanking method. Background technique [0002] At present, in the machining industry, there are generally three forms of opening or opening holes on parts: drilling, cutting holes, and punching. Drilling is not suitable for making notches on the edge of the part, and the diameter of the hole is limited by the processing equipment; the cutting quality of the cutting hole is not high, and it affects the material performance of the part, and the efficiency is low. Compared with traditional mechanical processing, punching has the advantages of saving materials and energy, high efficiency, low technical requirements for operators, and the ability to make products that cannot be achieved by mechanical processing through various mold applications, so its use is becoming more and more more extensive. Punching generally uses large-scale mechanical punching machines, and...

AI Technical Summary

Problems solved by technology

However, when the thickness of the steel workpiece reaches more than 10mm, especially when the diameter of the semicircular notch is large, it is necessary to install a guide post and a guide sleeve on the mold when punching the notch, and install an auxiliary device on the punch to avoid breaking. Although the production efficiency is high, the mold is complex, the die is easily damaged, the cost is high, and the industrial practicability is not strong

[0004] On the other hand, when ordinary punching machines punch steel workpieces with a thickness of more than 10mm, due to the large punching force requirements, when the sheet is punched down, the pressure of the oil cylinder acting on the workpiece is released instantly, resulting in a large impact. It is easy to damage the equipment, so the hydraulic press is generally not used for punching steel workpieces with a thickness of more than 10mm

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