SU954169A1 - Injection mould for liquid forming of large-size castings - Google Patents

Description

one

The invention relates to foundry, in particular in liquid stamping, and is intended to produce large castings.

Closest to the present invention is a mold for liquid forming of large-sized castings, containing the upper and lower base plates, a punch holder in which the shanks of the punches are fixed, both are enclosed with a liner and guide columns. When this punch holder is equipped with eccentric bushings placed in pairs one to another, and a spring-loaded plate installed 15 between the punch holder and the upper support plate and having holes for the shanks of the punches, the latter being placed in eccentric bushings And o20

The disadvantage of this mold is in the TQM that the eccentric sleeves do not have rotational stops and the sleeves can unfold

to a position (minimum or maximum eccentricity) from which they cannot be removed by axial force.

The purpose of the invention is to increase the reliability of the operation of the mold by limiting the rotation of the eccentric sleeves.

This goal is achieved by the fact that in the mold, the upper and lower support plates, the holder with punches placed in eccentric bushings installed in pairs one to another, and the spring-loaded plate with holes for the punches' shanks, on the end surface of the external eccentric sleeve and on the side surface of the inner eccentric bushing there are protrusions interacting with each other.

FIG. 1 shows a mold, a vertical section; in fig. 2 - outer eccentric sleeve, vertical section, in FIG. 3 - eccentric bushing inside, vertical section; in fig. i - section A-A in FIG. 2; in fig. 5 is a section BB in FIG. 3 in FIG. 6 shows the limiting position of the eccentric sleeves before the production of castings j in FIG. 7, the limiting position of the eccentric sleeves after the production of the castings, section.

The mold consists of an upper 1 and lower 2 base plates, a punch holder 3 fixed on the plate 1 by means of bars C. A movable plate 5 with springs 6 is installed between the bars k and two eccentric sleeves 7 and 3 are installed in the holes of the punch holder 3 8, one inside the other, the inner diameter of the inner sleeve 7 being a fitting for mounting the shank 9 of the punch 10. On the side surface of the inner eccentric sleeves 7, protrusions 11 are made, and on the end surface of the outer eccentric sleeves 8 are projections 12. The projections 11 and 12 are located on the thickened portions 13 and It of the sleeves 7 and 8. On the lower support plate. 2 is fixed: liner 15. The lower support plate 2 is equipped with guide columns 16 with springs 17 on which a movable sleeve 18 is mounted. Holes 19 are made in the plate 1

The mold works as follows.

After pouring the metal 20 into the matrix formed by the liner 15 and the yoke 18, the press is closed. The upper part of the mold is lowered, and the punches 10 are inserted into the liquid metal 20 and the casting 21 is formed, and the holder 3 presses with its lower end on the upper end of the sleeve 18 and forms a closed mold cavity. Upon further movement of the upper part of the mold down the spring 17 is compressed, the casing 18 is lowered and pressure is applied to the metal. After solidification of the Metal under pressure, the mold is opened, the punches are removed from the resulting cavities of the casting.

In case of a delay in the process of extracting the punches from the cavities of the casting, the latter cools down and the center-to-center distance between the cavities on it decreases. Fastening

the punches 10 in the piercer 3, with eccentric sleeves 7 and 8, allow the punches 10 to move from the initial position

(H + DN) meet each other by the magnitude of a decrease (2 DN) of the center-to-center distance during the cooling of the casting (Fig. 7). After removing the punches from the casting, by lifting the press beam to a certain position, the stops installed on the stationary press frame (not shown) pass through the holes 19 in the plate 1, abut the plate 5 and, squeezing

springs 6, put the plate 5 on the shanks 9 punch; it is 10 and return them to their original position (the eccentric bushings unfold in the opposite direction)

The presence of the protrusions 11 on the sleeves 7 and the protrusions 12 on the sleeves 8 prevents the sleeves from turning to a minimum and maximum eccentricity position from which they cannot be pulled out. Zo The turn of the sleeves is limited by the size of each sleeve. This is achieved by the fact that each of the protrusions covers a quarter of the diameter

bushings

The invention makes it possible to increase the reliability of the operation of the mold, by preventing the sleeves from turning to their minimum and maximum. maximum eccentricity.

Claims (1)

1. USSR author's certificate 616059, cl. B 22 D 27/12, 1976.