Fine punching mold frame

Abstract

The precise punching die frame has U-shaped main body; upper punching pin, upper cover, pre-stressed spiral spring, hold-down die sleeve and raised die handle mounted onto the upper arm of the main body; and work bench mounted onto the lower arm of the main body. It features that the hold-down die sleeve is mounted onto the upper arm via roller bearing and fixed lining in movable fit; and the upper hydraulic cavity formed with the raised die handle as plunger and the hold-down die sleeve as cylinder is connected to the upper high pressure sealed container.

Description

Technical field: [0001] The invention belongs to the technical field of tooling and dies in plate fine blanking technology, and specifically designs a fine blanking die frame which is especially suitable for multi-station blanking of plates on a common punching machine. Background technique: [0002] In modern manufacturing and processing industry, precision blanking plays a very important role. Fine blanking needs to be carried out on precision stamping machines. Because fine blanking has high requirements for the precision of precision stamping machines, its cost is also very high, so it is necessary to perform on ordinary punching machines. Installing a fine-blanking mold base for fine blanking is widely used. Since the fine-blanking mold base with double-column guidance, three-column guidance and four-column guidance cannot perform multi-station punching and blanking on different parts of the same large plate, Thus came into being Figure 7 The U-shaped single-arm blanki...

AI Technical Summary

Problems solved by technology

[0002] In modern manufacturing and processing industry, precision blanking plays a very important role. Fine blanking needs to be carried out on precision stamping machines. Because fine blanking has high requirements for the precision of precision stamping machines, its cost is also very high, so it is necessary to perform on ordinary punching machines. Installing a fine-blanking mold base for fine blanking is widely used. Since the fine-blanking mold base with double-column guidance, three-column guidance and four-column guidance cannot perform multi-station punching and blanking on different parts of the same large plate, Thus came into being Figure 7 The U-shaped single-arm blanking formwork shown, because the cantilever of this formwork is longer, so the plate can be placed in any position in a considerable range, and the multi-station blanking is completed. The blanking process is: when When the slide block of the punch press moves down and presses on the upper pressure head 43, due to the high rigidity of the disc spring 45, the upper pressure sleeve 44 cannot move down, only the upper end cover 46 compresses the spring 47 to move down, and the crimping die set 48 together with the crimping die 53 moves down at the same time and presses on the sheet material 49, after that, the disc spring 45 is compressed, and the punch handle 50 moves down together with the punch 51, and the sheet material 49 is punched under the joint action of the punch 51 and the die 52 , but, there is following shortcoming in this blanking formwork: the effective displacement amount of disk spring 45 has certain limit, and once the material, size and shape of disk spring are selected, its elasticity just will be determined thereupon. It is a sliding fit between the blank holder die cover 48 and the formwork main body 54. During the working process, the blank holder die cover 48 carries out frequent reciprocating movements relative to the formwork main body 54 and produces friction loss. A gap is formed between the side mold cover 48 and the formwork main body 54, so the precision requirement of fine blanking cannot be guaranteed. Therefore, the processing accuracy and the wear resistance of the material of the blank holder 48 and the formwork main body 54 are very high; When punching a thicker plate, after the blanking die set presses the plate, when the punch 51 and the die 52 cut the plate 49, it is difficult to install a device for reversely pressing the plate in the die, resulting in The quality of the blanking section is poor, and even burrs appear. Therefore, it is imperative to develop a fine-blanking formwork that can not only retain the advantages of the U-shaped cantilever formwork, but also overcome the above shortcomings.

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