SU1219207A1 - Apparatus for shaping hollow articles - Google Patents

Description

one

The invention relates to the processing of materials by pressure, namely, sheet stamping, and can be used in all areas of mechanical engineering for the manufacture of hollow articles.

The purpose of the device is to simplify the design and improve the accuracy of products by reducing the load on the punch.

Fig. 1 shows the device, the general view (to the left of the axis the initial position is shown, and to the right the end of the shaping process) | in FIG. 2, node I in FIG. 1 | in FIG. 3, node II in FIG. 1.

The device contains a removable matrix 15 enclosed in a container 2 so that its outer diameter is larger than the diameter of the receiving cavity 3 of the device, having a section 4 formed by the intersection of the cylindrical surface of the container 2 with the mirror of matrix 1. A blank 5 is located on the mirror of the matrix, cavity 3 is fitted with an elastic element 6. In the receiving cavity 3 of the device with the possibility of relative axial movement of the clamp 7 with the catcher 8.

The safety device 8 has the shape of the internal surface of the finished product, is located in the working cavity 9 of the matrix and interacts with the internal cavity of the ejector 10, the latter is installed coaxially with the matrix and has the ability to reciprocate from the hydraulic (pneumatic) drive 11, the upper stage 12 of the clamp is located in the receiving cavity 3 of the device and interacts with the elastic element 6, the Matrix is attached to the press table 13, and the clamp is respectively attached to the upper press plate (not shown).

The device works as follows.

In the receiving cavity 3 of the device set the workpiece 5 with a thickness of Sp, diameters D, and d and an elastic element 6. When lowering the press slide (not shown) down, the clamp 7 fixed on it with the safety gear 8 enters the working cavity 9 of the die and interacts with the internal ejector cavity 10. This thereby ensures the centering of the workpiece 5 and the clamping 7 relative to the mat 21207 2

1. At THIS, the upper part 12 of the clamp interacts first with the elastic element 6 and then with the workpiece 5. As the pressure of the clamp 7 increases, the elastic element and the draft flange squeeze.

This process is accompanied by a simultaneous increase in lateral loads on the clamp at the point of transition of the upper stage 12 to the safety gear 8, which is made along the radius R, and tends to bend it.

However, due to the fact that

15, a portion of the lower catcher 8 of the clamp is in constant interaction with the internal cavity of the ejector 10, unloading of the catcher 8 from the bending moment is achieved, and storing a predetermined uniform shaping gap. This ensures high accuracy of the parts in terms of thickness and internal diameter and an increase in the efficiency of the clamp.

25 — The joint draft of the flange of the workpiece and the accompanying compression of the elastic ring leads to the formation of a significant expansion chamber 30 yci in the area 4 of the receiving cavity.

Since the receiving cavity 3 is made composite and is formed by conjugation of the container 2 and the plane

The JC mirrors of matrix 1, the expanding forces that occur, are perceived by the tensile tensioner. This achieves the elimination of hazardous voltage concentrators on the Q Qe 4 site of the receiving cavity and thereby its strength. As a result of the fact that the diameter of the outer surface of the matrix is larger than the diameter of the receiving cavity, the leakage of the elastic

2 elements in the process of its compression in section 4. With the further movement of the clamp, the metal of the workpiece, which is under the combined influence of the clamp and the elastic element, is put into a plastic state and is squeezed out along the radius R into the forming gap. When the desired height of the product is reached, the shaping process is terminated. At this point, a command is issued to retract the clamp to the upper initial position and press the article out of the die. The manufacturing cycle ends.

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55

12

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FIG 2

Editor E. Papp

Compiled by I. Lanska

Tehred A. Babinets Corrector L. Patay

Order 1188/14 Circulation 783 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (2)

'1. DEVICE FOR FORMING HOLLOW PRODUCTS, containing a container with a matrix and placed together with it, a clamp and an elastic element, t ouching it with the fact that, in order to simplify the design and increase the accuracy of products by reducing the loads on the punch, it equipped with a centering unit for the workpiece and the clamp relative to the matrix, made in the form of a trap located coaxially and facing one another, located on the clamp with the possibility of reciprocating movement, and an “ejector from the inner floor a bridge for guiding the catcher. 2. The device according to p. ^ Characterized in that the matrix is removable, while ° nm *> where D _H is the outer diameter of the matrix, mm; D _np is the outer diameter of the clamp, mm