Automatic-lubricating drawing die

Abstract

The invention discloses an automatic-lubricating drawing die used for automatic lubricating for drawing in the workpiece cold working process. The top end of a guide sleeve of an upper die base of the die is sealed through a sealing plug, a guide pillar is inserted from the bottom end of the guide sleeve, and therefore a changeable sealed pressure cavity is formed inside the guide sleeve. The pressure cavity is respectively communicated with a lubricating oil tank and a lubricating oil cavity through an oil inlet pipeline and an oil outlet pipeline, and the lubricating oil cavity is communicated with the upper surface of a cavity of a drawing female die. An oil inlet one-way valve is arranged on the oil inlet pipeline and makes oil be in an only-in-no-out state. An oil outlet one-way valve is arranged on the oil outlet pipeline and makes the oil be in an only-out-no-in state. On the basis of a drawing die, in combination with a plunger pump principle, the guide sleeve and the guide pillar are used for achieving linkage between drawing work and lubricating oil injecting of the die, automatic lubricating is achieved without shutdown, the system is simple, cost is low, and the lubricating effect is good.

Description

technical field [0001] The invention belongs to the technical field of cold stamping processing, and relates to a drawing die, in particular to a self-lubricating drawing die. Background technique [0002] Deep drawing (also known as drawing) is to use a deep drawing die to make a flat blank or a hollow process part into an open hollow part under the pressure of a press. [0003] In large-scale and precision deep drawing, it is necessary to apply lubricating oil between the die and the workpiece. Lubrication can effectively reduce the friction between the workpiece and the die, thereby reducing the drawing force, reducing the limit drawing coefficient, and improving the drawn parts. process performance. At the same time, due to the reduction of wear, the life of the die can be extended and the drawing precision can be improved. At present, there are two main lubrication methods used in deep drawing dies: [0004] The first method is to use the working gap of the drawing p...

AI Technical Summary

Problems solved by technology

[0004] The first method is to use the working gap of the drawing press to manually apply lubricating oil to the surface of the punch and die with a brush before the blank enters the mold station. This method has the following defects: 1. It needs to be stopped for lubrication , low efficiency, directly affects the use efficiency of the mold

2. Because it does not use real-time lubrication, the lubrication effect is poor, especially for the lubrication of large deep-drawn parts

3. Manual operation is not conducive to the realization of stamping automation

[0005] The second method is to combine the hydraulic system of the press or design a separate hydraulic system, design a separate lubricating oil circuit, and spray lubricating oil to the working surface of the mold continuously. This method is compared with the first manual lubrication. The method has the advantages of saving time and labor, but it also has the following disadvantages: 1. The structure of the separate hydraulic lubricating oil system is complex, on the one hand, the cost is high, and on the other hand, the system reliability is reduced

2. As an independent lubrication system, it cannot be linked with the stamping work, and the continuous oil injection will pollute the working environment, and the waste of lubricating oil is serious

3. Lubricating oil cannot act on the friction surface, and the lubrication effect is sometimes not as good as manual lubrication

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