SU1187912A1 - Method of pressing intermittent-section articles of powder in rigid injection die - Google Patents

Abstract

METHOD OF PRESSING FROM POWDER OF ACCESSORIES OF THE ACCELERATED SECTION IN THE HARD PRESS FORM, mainly step across the section, including installation of the matrix on a removable stop, placing inside the matrix of a removable stop, external and internal lower punches, powder filling into the cavity, installation in the external upper punch matrix , filling the powder into the cavity, installing an inner upper punch, installing a removable stop on the outer upper punch, compacting and pushing out products, characterized in that To increase the equal density of the products, first, the part of the latter with the largest cross-sectional area is compacted by simultaneous movement of the upper punches and the die before the latter touches the removable stops, then the removable stops and then compaction (the remaining parts are removed simultaneously with the movement of the upper and lower punches . 00 with to

Description

1 The invention relates to metallurgy powders, namely the manufacture of articles from metal powders by pressing in rigid molds. The purpose of the invention is to increase the wound density of products of variable cross section with a stepwise decrease in cross section to the ends. The explanation is carried out using the example of manufacturing a piece of glass with a shank of powder of an alloy based on PZH iron. FIG. Figure 1 shows schematically the filling of powder with a mold (on the left, filling a ring junction and a transition with a maximum cross-sectional area; on the right — setting the upper punch and filling the tail part with a powder); in fig. 2 - pressing of the cross-over having the maximum cross-sectional area (on the left - the beginning of pressing; on the right - the end of pressing); in fig. 3 - pressing the tail of the Vika and the ring transition of the part (on the left - the beginning of pressing; on the right - the end of pressing); in fig. 4 ejection of the product (on the left — ejection of the junction with the maximum cross-sectional area; on the right, ejection of the shank). Three transitions are fitted in the product: ring, base, shank. The weight of the sample for each selected element M, M2, My is determined by a calculation method. Inside the matrix I, a removable support 2 with an elastic element 3 is placed. The matrix 1 is mounted on a removable internal support 4, a lower external 5 and an internal 6 punches. In the cavity formed by the lower punches and the die, weights are loaded to compress the ring M and the base M2 (Fig. 1, left). Then in the matrix I on the layer of the fixed. The powder installs the upper outer punch 7 and a portion for pressing the shank M is poured into it (Fig. 1, right). In the upper outer punch 7 install the inner punch 8, and on it is placed the upper removable stop 9 (Fig. 2, left). The press slide, moving down, acts simultaneously on the upper punch 8 and, through the stop 9, on the external punch 7. At the same time, the powder is compacted in the base, the transition having the maximum cross-sectional area. Under the influence of the frictional forces that occur during compaction of the powder, the matrix 1 also begins to move downward, overcoming the resistance of the elastic element 3. When the matrix 1 contacts the abutment 2 with the lower end and the abutment 9 with the upper end, the transition pressing the base ends (Fig. 2, on right). After that, the removable stops 2, 4, 9 are removed, and the press slide continues downward movement (Fig. 3, left). Matrix I gets a floating position. As a result, the effect of simultaneous oncoming movement of the upper and lower punches is created and bilateral pressing of the other transitions of the part: the shank and ring occurs. Pressing the part ends when the punches are fully inserted into the die, and the slider touches the upper face of the die, and the lower end of the die touches the press table (Fig. 3, right). The table shows the density values of each element of the parts manufactured by the proposed and known methods. As can be seen from the table, the proposed method allows to increase the uniformity of parts and improve their quality.

Ring

Base

Shank

5.1

28,8

7.1b 5.35

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Table continuation

d

m I

one /}./ ///

Fig 3

Fig

Claims (1)

METHOD OF PRESSING FROM THE POWDER OF VARIABLE SECTION PRODUCTS IN A RIGID PRESS FORM, mainly stepwise in cross-section, including installing the matrix on a removable stop, placing inside the matrix a removable stop, external and internal lower punches, filling the powder into the cavity, installing an external upper puncheon, filling in the matrix powder into the cavity, the installation of the inner upper punch, the installation of a removable stop on the outer upper punch, sealing and pushing products, characterized in that, in order to increase avnoplotnosti product initially produce the seal of the last with the largest cross-sectional area by the simultaneous movement of the upper punches and dies to contact the latter with movable abutments, removable stops are then removed and the remaining parts of the seal produce simultaneous movement of the upper and lower punches. SU.,., 1187912 Fce! 1 187912