SU1447528A1 - Die-casting mould for making investment patterns - Google Patents

Abstract

The invention relates to a foundry, in particular to a process for modifying cast iron in a mold. The purpose of the invention is to improve the quality of castings by increasing the time of contact of the melt with the modifier. This goal is achieved on the lateral surface of the model 10, the stand of the groove groove 14 and the deep-hole hole 11 on the smaller end 12, by means of which the bar modifier 3 is fixed on the model 10, which is shaped and unscrewed from the cavity of the sink, the modifier 3 remains in the form, allowing the pouring to evenly modify the melt. 2 sec. f-ly, 2 ill. about S (L | ib Jz about to 00

Description

FIELD OF THE INVENTION The invention relates to foundry, in particular, to technology for modifying cast iron in mold.

The purpose of the invention is to improve the quality of castings by increasing the time of contact of the melt with the modifier.

FIG. Figure 1 shows the casting mold assembly with a molded bar modifier J in FIG. 2, a model of a stand with a bar modifier wound on it.

The casting mold contains a casting-feeding system 1 with stand 2, in the cavity of which there is a spiral modifier 3 in the form of a spiral, the upper end 4 of which is fixed in the form body, and the lower end 5 is directed along the axis of the stand 2 to the side the filling hole 6, as well as the shaping cavity 7. The form consists of two half-forms - the upper 8 and the lower 9.

Model 10 100 2 has a blind-hole 11 on the smaller end 12. On its side surface 13 there is a screw groove 14 in which modifier 3 is placed in the form of a spiral, one end 4 of which is tangentially directed to surface 13, and the other end 5 is inserted into the end face. hole 11.

Basing of model 10 of stand 2, on sub-model plate 15, is carried out through hole 16 in the bottom end of model of frame with pin 17 fixed in sub-model plate. A groove 18 is made under the protruding part of the wire in the under-model plate.

The mold is made as follows.

A bar modifier 3 is wound on a helical groove 14 of a model 10 of a stand 2, the end 5 is preliminarily inserted into an end hole 11. manual or on the device.

The lower half of the mold 9 is molded, then the upper half of the mold 8. After forming the half of the mold, the submodel slab with the model kit is pulled, the upper half of the mold 8 is set

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on the bottom 9, then the model of the sink from the half-form 8 is unscrewed. After that, the modifier 3 in the form of a spiral remains in the half-form, its upper end 4 is in the body of the form 8. Then the flasks are fastened or nailed. The form is ready for pouring. When pouring through the opening 6, the melt passes through the stack 2, interacts with modifier 3 and flows through the sprue-feeding system 1 into the forming cavity 7. The dissolution of the modifier by the melt occurs evenly and gradually over the entire casting period. Modifying the first portion of the metal entering the mold ensures that the end of the modifier 5 is directed toward the filling hole 6, and the helix is based in the mold because the modifier is recessed into the mold body (in this case half the diameter). is. in the form body.

The use of the invention makes it possible to eliminate scrap in non-metallic inclusions in castings, to obtain castings of any configuration and to combine in the framework of a single technological chain the production of castings from both gray and from modified iron. F, o rmula of the invention

1. A casting mold for producing modified castings containing a shaping cavity, a gating system with a stand and a sump, and a modifier fixed in the stand, characterized in that

in order to increase the quality of castings by increasing the time of contact of the melt with the modifier, the latter is made in the form of a spiral from a rod and placed along the entire height of the stack, while the upper end of the modifier is located tangentially to the surface of the drain and fixed in the body of the mold, and the lower end at the sump level, they are bent up and directed along the axis of

2. A model of a stand for the manufacture of a mold, made in the form of a truncated cone, characterized in that, in order to improve the quality of castings by increasing the contact time, dispense

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Claims (2)

Claim 35 ' 1. A mold for producing modified castings containing a mold cavity, a gating system with a riser and a sump, and a modifier fixed in the riser, characterized in that, in order to improve the quality of castings by increasing the contact time of the melt with the modifier, the last ³ it is made in the form of a spiral from a bar and placed along the entire height of the riser, while the upper end of the modifier is located tangentially to the surface of the riser and is fixed in a body shape ^ and the lower end is bent upward at the level of the sump down on the axis of the riser. 2. The riser model for the manufacture of the mold, made in the form 55 truncated cone, characterized in that, in order to improve the quality of castings by increasing the contact time of the melt with the modifier, on its side stream, and in the center of the lower base of the surface a helical-deaf-hole hole is made.