SU1666270A1 - Casting mold for die casting - Google Patents

Abstract

The invention relates to foundry, in particular to injection molding. The purpose of the invention is to improve the quality of the casting and the reliability of the operation of the mold. The mold includes a movable half-form 1 with a divider mounted in the sprue bushing 5 movably in the axial direction, working cavities 6, sprue channels 7, washer 8, channel 9 connecting the lower part of the inner cavity of the sprue bushing with washer, and ejection system 10. The runner channels 7 connect the top of the washer 8 to the working cavities 6 of the mold. The divider consists of a housing 2 and a diaphragm 3, the end surface of which is curved and directed toward the sprue bushing, with the divider body 2 being equipped with a shank 4 having the ability to interact with the ejection system 10 and the diaphragm 3 of the divider. When the metal is pressed in, the contaminated metal from the bottom of the sprue bushing 5 enters the washer 8, and the pure metal thereafter, through the top of the washer and the gating channels 7, into the working cavities. Under pressure, the diaphragm 3 bends and seals the gap between the half-form 1 and the body 2 of the splitter. 1 hp ff, 5 ill.

Description

The invention relates to foundry, in particular to injection molding.

The aim of the invention is to improve the quality of castings and reliability of operation.

FIG. 1 shows the described mold in the closed position before pressing in the metal, a section; Fig; 2 shows a section A-A in Fig. 1; on fig.Z - the mold at the time of pressing the metal section; figure 4 - node i in figure 1; Fig. 5 shows a mold at the stage of casting formation, a section.

The injection mold consists of a movable coupling half 1, a dissector consisting of a housing 2, and a diaphragm.

3 and the shank 4 mounted in the sprue bushing 5 movably in the axial direction of the working cavities 6, gating channels 7, the washer 8, the channel 9 connecting the lower part of the inner cavity of the sprue bushing 5 with the washer 8, the ejection system 10. In this case, the gating channels 7 are connected to the upper part of the washer 8 and the working cavities 6 of the mold, and the end surface of the diaphragm 3 is made convex and directed towards the gating sleeve 5. Shank 4 of the splitter

4 there is an opportunity to interact with the ejection system 10 and the diaphragm 3 of the dissector. The shank 4 has a flange and a support surface B,

In the working position before pressing metal mold is closed (figure 1). The diaphragm 3 of the dissector closes the channel 9 and is located in the sprue bushing 5 with a gap a (FIG. 4) allowing the free movement of the dissector. In addition, the diaphragm 3 fits snugly to the housing 2 of the dissector on the surface B and is installed with a gap b relative to its end (figure 1). The flange of the body 2 of the dissector is adjacent to the mold 1, and the supporting surface B of the shank 4 is adjacent to the body of the dissector.

When metal is poured into the extrusion chamber, the first portions of the metal, flowing over its bottom towards the movable half-form, interact with excess lubricant, saturate with gases, cool and accumulate as a solidifying crust into the zone of the Gating sleeve 5.

After filling the pressing chamber

the metal on its surface contains a contaminated layer of their gas inclusions, oxide films and slag, arising from the interaction of a metal jet with air and gases in a pressing chamber.

Under the pressure of the pressing piston, the liquid metal fills the entire volume of the pressing chamber and the sprue bushing 5. In this case, the contaminated surface layer of the metal is localized in the upper part

the sprue bushing 5 (zone D), and the divider moves to the extreme left position — until it stops at the movable mold I, the channel 9 and the contaminated metal from the zone G of the sprue bushing 5 are opened through the channel 9

rushes to the bottom of the washer 8, and the clean metal from the bottom of the sprue bushing 5 through channel 9, through the upper part of the washer 8 and through the gating channels 7 enters the working cavities 6 of the mold,

Under the action of increasing pressure on the metal in the pressing chamber, the diaphragm 3 bends in the gap b, fits snugly to the end part of the body 2 of the splitter, and

its peripheral surface selects the gap a (due to the elastic deformation) between the divider and the movable half-form, completely preventing the ingress of liquid metal into it (figure 4). With this shank

4 is moved to the left by the amount of gap b. At the end of the pressing cycle, a press residue is formed from the contaminated metal in the zone of the sprue bushing 5.

After the casting has hardened, the mold is opened and the ejection system 10 extracts the casting from the mold. In this case, the shank 4 with the end interacts with the ejection system 10 and with

by means of the supporting surface B returns the body 2 of the dissector to its original position. In addition, the shank, 4 to the original

the position is returned and the diaphragm 3 of the dissector.

Thus, the guaranteed size of the gap is provided between the body 2 of the dissector and the diaphragm 3.

When closing the mold, the divider enters the sprue bushing 5 and closes the channel 9.

The process is repeated.

The invention makes it possible to localize the contaminated portions of metal formed in the upper and lower zones of the compression chamber in the press residue, washer and runner channels, which improves the quality of the casting.

In addition, the presence of the diaphragm, located in the second part of the splitter, makes it possible, when pressing in the metal, to eliminate the gap between the splitter and the movable half-shell, which prevents liquid metal from getting there and the jamming of the splitter.

Claims (2)

Claim 1. Injection mold for injection molding, comprising a movable mold with a spreader and an ejector system a fixed half-form with a gating bushing, in the lower part of which a channel is made, connected through a gating channel to a working cavity, characterized in that, in order to improve the quality of the castings, under the channel of the gating bushing, a washer is connected, This divider is mounted for movement in the axial direction. 2. Mold 1, characterized in that, in order to increase the reliability of operation, the divider consists of a body placed at its end of the diaphragm with a curved surface convex to the side a runner sleeve, and a liner associated with the diaphragm and having the ability to interact with the ejector system. Aa Schi 2 fi & w / L Y //////////; Y / YA; 9 2 & J ftetf