SU1235657A2 - Injection mould for pressing continuous articles - Google Patents

Description

The invention relates to powder metallurgy, in particular, to molds for pressing long articles of powders, preferably of low plasticity, and is an improvement of the device according to the main author. No. 1090498.

The purpose of the invention is to improve the quality of products.

FIG. Figure 1 shows the mold at the time of pressing the first part of the product; in fig. 2 shows a section A-A in FIG. 1 in FIG. 3 - mold at subsequent stages of the pressing process.

The mold consists of a lining 1, an intermediate ring 2, on which a prefabricated matrix 3 is installed, inside of which a central core 4 is placed, forming a ring

target gap 5 with the surface of the matrix, 20 are yoke holder 16 by means of clamp 17,

and punch 6, limiter 7, auxiliary ring 8 and stop bolts 9.

Matrix 3 is made of a national team with connectors in the horizontal and vertical planes. It consists of the upper 10, central 11 and intermediate 12 parts, while the central part 11 of the matrix covers the intermediate replaceable parts 12 by making protrusions 13 in it, which are included in the grooves 14 of the intermediate parts 12. The protrusions 13 and the grooves 14 are made so that they form locking connection preventing vertical displacement of the matrix components, but not preventing their displacement in the horizontal plane. The magnitude of this displacement can be adjusted using stop bolts 9 installed in the central part 11 of the die 3. With their help, it is also possible to adjust this displacement.

In addition, the central 11 and each of the interchangeable intermediate parts 12 of the matrix 3 consist of three vertical cap parts 15, fastened with split holders 16 by means of a clamp 17. The rod 4 is also made assembled, having connectors in a horizontal plane, and consists of an upper 18 , central 19 and replaceable intermediate 20 parts. In this case, the planes of the connector 21 of the rod 4 coincide with the planes of the connector 22 of the matrix 3.

The device works as follows.

In the gap 5 between the rod 4, composed of the upper 18 and interchangeable intermediate 20 parts, and the matrix

3, composed of the upper 10 and intermediate 12 parts, the clamped frame 16 by means of the clamp 17, is loaded with the first portion of the powder, the punch bis is inserted using a press (not shown) to press. The upper parts 10 and 18 of the matrix 3 and the rod

4, as well as the punch 6, are easily removed thanks to the fact that the connector planes of the matrix 1 3 and the rod 4 coincide with the forming plane of the punch 6. The central 11 and 19 parts of the matrix 3 and the rod 4 are installed, and the installation of the central part of the matrix is performed in parts with the stub bolt turned out, after which its height is 5 0 s

five

0

five

| With the aid of stop bolts 9, the central part 11 of the die is exposed relative to its intermediate part 12 so that their forming surfaces coincide.

After that, the auxiliary ring 8, the upper 10 and 18 parts of the matrix 3 and the rod 4 are installed. In the matrix cavity thus formed, pour the next batch of powder and press again. After removing the top 10 and 18 parts of the matrix and the rod, the matrix 3 and the rod 4 are further expanded with their replaceable intermediate 12 and 20 parts. The vertical parts 15 of the intermediate part 12 of the die are inserted alternately into the corresponding groove, which is made in the central part of the matrices 11. The stop bolts 9 are then turned out. As a result, it is possible to install the entire set of vertical parts 15 of the intermediate part 12 into the central part 11 of the matrix. Thereafter, the vertical portions 15 of the slice section 12 of the matrix 1 are clamped by means of clamp 17. With the help of stop bolts 9, the intermediate section 12 of the matrix is aligned with its central part 11 so that their forming surfaces coincide.

Another portion of the powder is poured into the formed working cavity, a punch 6 is inserted, after which the pressing is performed. All compressed

parts of the workpiece are joined together with the elimination of the interface between them, as well as delaminating cracks.

To remove the compacted preform, the upper part 10 of the die is removed from the mold, after which the core 4 is pressed out in the usual way. Then remove the clip 16, releasing the pre-clamps 17, first with interchangeable intermediate 12, and only then from the Central part 11 of the matrix. Such a cage sequence ensures simultaneous release of the workpiece from the matrix along its entire height, which eliminates the consequences of an elastic consequence,.

When pressing a batch of long thin-walled bushings in the amount of 100 pcs. in a known mold, the number of rejects due to spillage of the sleeves is 20 pieces, while using the proposed mold reduces the number of defective sleeves to 4, i.e., the number of rejects during pressing is reduced by 80%. At the same time, labor costs are reduced by 20%.

/ 7

Editor Oh, Bugir

fig j

Compiled by A. Tumanov

Tehred Oh, Gortvay Proofreader G. Reshetnik

Order 3044/11 Circulation 757 Subscription

VNIIPI USSR State Committee

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

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

PRESS FORM FOR PRESSING 'LONG-DIMENSIONAL PRODUCTS by ed. No. 1090498, characterized in that, in order to improve the quality of products, it is equipped with fixed bolts installed in the central part of the matrix, and the mating grooves and protrusions of the matrix parts are configured to form a locking joint in the axial direction. 1235657 A 2 of figure 1