RU2522912C2 - Method of blanking - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to blanking at dies and can be used in production of thin-wall parts. Prior to placing at die, stack of blanks is formed at fitting process shims from top and bottom and between all stacked adjacent blanks to be jointed together by permanent joint. Produced stack is placed at die pad to cut blanks. Then, process shims are removed. Corrugated sheet is used as said process shims Stack of blanks is formed by fitting sheets in every crimps and locking them therein by permanent joint.

EFFECT: higher quality of parts and process efficiency.

2 cl, 4 dwg

Description

The invention relates to the manufacture of parts by punching on presses and can be used in the manufacture of various thin-walled parts, for example, space-woven nets from wire of small diameter.

A known method of manufacturing parts by cutting in a stamp from a sheet. According to this method, a flat metal billet is laid on the die matrix, and the part is cut out with a punch passing through the hole in the die (V.P. Romanovsky. Handbook on cold stamping. L., Engineering, 1979, pp. 11-12, Fig. 3).

The disadvantage of this method is the difficulty of aligning the workpiece before cutting, which leads to distortion of the shape and size of the cut part. In addition, the cutting of grids consisting of thin wires requires the use of precise, expensive dies with a minimum gap between the punch and the die, since with a large gap, individual wires are pulled into the gap and break off there in a chaotic manner.

The use of laser or EDM cutting is unacceptable in connection with the possible contamination of the finished mesh particles of molten metal or erosion products. Therefore, at present, such nets are cut out in a low-productivity locksmith method - cutting with hand scissors.

A known method of cutting from non-metallic sheet materials by exposing the workpiece on one side of an elastic matrix, and on the other a hard punch. The method is characterized in that on the workpiece from the side facing the matrix, a gasket of material is placed, the tensile strength of which exceeds the tensile strength of the processed material (AS No. 479533, B26F 1/00).

The disadvantage of this method is that in the process of cutting, a gasket from a material stronger than the material being processed unacceptably deforms the workpiece, which leads to marriage. In addition, the high-strength gasket accelerates wear on the cutting edges of the rigid punch. Felling parts by the piece, and not in a bundle, significantly reduces labor productivity.

As the closest analogue, the method of cutting thin-sheet non-metallic parts with a knife stamp is selected. According to this method, stamping in batches of up to 50 sheets is used, and there are two methods: stamping through on a fiber, polyurethane or wooden lining and stamping half of the sheets of a thickened bundle, the second half of the sheets serving as a lining (V. P. Romanovsky. Handbook on cold stamping. L ., Engineering, 1979, p.242, Fig. 207).

The disadvantage of this method is that in the process of cutting mesh parts, weaving along the contour of the part ends of the dangling wires of adjacent blanks. This prevents the finished parts from being cut out of the bundle without damage.

The problem solved by the invention is to improve the quality of cutting parts from a pack of sheet materials having, for example, a non-rigid structure, increased productivity.

The problem is solved in that in the method of cutting parts from a pack of sheet materials in a stamp before installing them into a stamp, a package of blanks is formed by placing technological gaskets on top, bottom and between all adjacent sheet materials assembled in a pack with their subsequent stationary connection to each other, set formed the package on the lining of the stamp and carry out cutting down, after which the process gaskets are removed.

In addition, the problem is solved by the fact that in the method of cutting parts from a pack of sheet materials in a stamp, corrugated sheet is used as technological gaskets, a package of blanks is formed by installing sheet material in each of the corrugations, followed by their fixed connection to each other.

Figure 1 shows the finished part 1 and the workpiece 2, intended for cutting parts 1, figure 2 is a diagram of cutting, for example, grids according to the proposed method, figure 3 is a felled bundle consisting of finished parts separated by process gaskets, Fig. 4 is a diagram of cutting when using a corrugated sheet as a technological strip.

The implementation of the method of cutting in the stamp parts from a pack of sheet materials, consider the following example.

It is required to make round parts 1. For this, take a roll of mesh or foil, unwind it into a ribbon and cut it (cut) from a pack, for example, of metal sheet materials of a mesh non-rigid structure or from a foil (aluminum or copper) with a thickness of 0.03 ÷ 0.05 mm on rectangular blanks 2.

Billets 2 in the amount of 20 ... 30 pieces are collected in a bag using technological gaskets 3, which are installed between all adjacent metal sheets 2 assembled into a bundle, as well as from the bottom and top of the bundle to protect against accidental pollution.

As process gaskets 3, for example, paper or plastic film is used.

Workpieces 2 assembled in a package in the form of metal sheets of non-rigid construction and located between them, as well as above and below, technological pads 3 are fixedly connected to each other by means of clamps 4. As clamps 4, for example, clamps or bent leaf springs 5 with levers can be used 6, providing the opening of the spring before compressing the pack.

The compression of the pack, consisting of blanks 2 and technological gaskets 3, along the edges with the help of clamps 4 provides its necessary rigidity and the absence of a relative shift of the layers between themselves during cutting.

A package of blanks 2 with technological gaskets 3 is installed on the lining 7 of the stamp and cut out on a press with a matrix 8. In this case, we get a bundle 9 consisting of finished parts 1 separated by technological gaskets, which are subsequently removed.

The manufacture of an experimental batch of parts showed that the pack 9, thanks to the technological gaskets 3, can be easily divided into finished parts 1. Thus, in one working stroke of the press, 20 ... 30 finished parts are obtained.

In addition, cutting in the stamp parts from a pack of sheet materials can be carried out by using as a technological strip 3 bent, for example, from paper in the form of a corrugation sheet 10.

Form a package of blanks: cut blanks 2 before cutting are installed in each of the corrugations of sheet 10 with subsequent fixed connection between them.

The formed package is installed on the lining 7 of the stamp and cut out on a press with a matrix of 8.

The result is a pack of 9, consisting of finished parts.

With this method, the alignment of the workpieces during assembly of the bundle before cutting is facilitated and greater rigidity of the bundle of workpieces is ensured.

Thus, the set of operations performed and the technological devices used allow us to ensure high-performance cutting down of parts from a pack of sheet materials, for example, from non-rigid space-braided nets from small diameter wires on a structurally simple and cheap stamp, and to improve their quality.

Claims (2)

1. The method of cutting parts from a pack of sheet materials in a stamp, characterized in that before being installed in the stamp, a package of blanks is formed by placing technological gaskets on top, bottom and between all adjacent sheet materials assembled in a pack with their subsequent motionless connection between them; on the lining of the stamp and carry out cutting, after which the process gaskets are removed. 2. The method according to claim 1, characterized in that the corrugated sheet is used as process gaskets, the package of blanks being formed by installing sheet material in each of the corrugations, followed by their fixed connection to each other.

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