SU64990A1 - Installation for pressure casting of compressed gas of rivets and other parts - Google Patents

Description

The installation of P1red1na1zachena for casting under pressure of compressed gas zaklapo-to other (x parts and; differs in that the form- for casting is made of three parts on the heat conduction parts.

Gutter plate made the least; heat conductive and partially immersed in the cast metal. Own1H (But the shape is made of steel, and the most heat conductive part is made of massive copper plate. The shape design and such a choice of materials for preparing its individual parts provide directional crystallization during casting due to the fact that cooling of the metal, and its continuous full feeding in the process of crisscallis CI1I. This guarantees the production of cast weeds, which in their quality are not different from the ovail strain.

The drawing shows the proposed installation. with a mold for casting, naprimer, riveted.

In the furnace 1 hermetically placed

boiler 2 with pa S1Plavalenny metallag 3. Metal loading is made 4eipei3 window 4. Partition 5 - serves to retard slags. The cover of the boiler B1sta is 1s litnikOVa plate 6. In the case of work with aluminum alloys, it can be cast iron. Vertical channels corresponding to the number of rivets made are made in it, the diameter of the channels is made — not less than the diagietra of rivets. The level of the molten metal is kept constant n-romanno. half the height of the gating plate.

A steel mold 7 for casting rivets is attached to the LITTING SURFACE TOP. On form 7, a copper plate 8 is placed, cooled by water (the cooling system is not shown on the Drawing). The sprue plate 6 is covered on top of the chill mold, which reduces heat transfer from the sprue plate to form 7-8.

Thereafter, Form 7-8 is pressed, against the gate plate, into the cat, ate 2 is given with the help of a compressed B-spirit

slight pressure, on the order of several hundred milli-meters of mercury. The metal is lifted up along the gating channel Kam I1 for the complete form 7-8. Zakleggok crystallization goes from top to bottom, from the head, cooled most intensively, to the sprue, growing ns mediation in the bath of liquid metal, the temperature of which does not change during operation.

At the end of the hardening of the rivet, at the moment when the crystallization of the metal is in progress, the pressure is removed in liter of the BOIM channel, and the level of the liquid metal in the gating channel; x decreases. Form 7-8 is pressed, the lithium pot, the end of which is pulled out of the liquid metal and has a correspondingly pointed shape, is cut off, the cast rivets are removed from the mold 7-8 and sent to thermal treatment.

Installing rivets takes 3-4 seconds; The Bioero cycle duration is determined by the degree of mechanization of auxiliary operations — supply and release of pressure, sprue runners, excavation of castings, etc.

As mentioned above, a necessary condition for iBbicoKoro product quality (in the considered nipHiM-eipe of rivet casts is a combination of intensive cooling of the crystallized metal; and fully feeding it. For this, in a liquid metal near the eons of the installation, you should always be in a way to get it. Also, the temperature should rise sharply from the head of the rivet to its tail.

If the head of the rivet is intensively cooled, then its temperature and its temperature should constantly be kept high. In the proposed construction, the maintenance of this required temperature is achieved by partially immersing the gating plate in the vial of liquid metal. The rivets are powered by the entire vaginal fluid

metal litnichki have very small sizes.

The thinner the gate plate, the better it warms up, but the more difficult it is to catch the moment when the part is completely crystallized, and the lytics have not yet come out of the gate channels into the depths of the baths (at the same time they grow to the sides and the shape cannot be removed from the GHG plate). ), practically the thickness of the gating plate should be calculated by several millimeters.

The advantages of the new method of casting OiCo6eBHo are revealed by comparing it with injection molding. When casting under the next stage, sequential crystallization and full feeding of the crystallizing metal: they do not have MiQcTa. Immediately after filling in the form, the gating springs harden, the feed to the part stops and the internal shrinkage voids appear in it.

When sold (the impact of liquid metal, THROUGH the narrow channels, large pressures are applied, the machine structure is complex, the quality of the discharge is low, and the metal consumption for liPnica is high.

For 1I1polzovaniya of a semi-immersion LITTING plate, because of the constant: high temperature of the runner channels, the pressure is low, the design of the machine 1 is simple, the parts are not inferior to (their qualities are stamped, the metal consumption per lithium is low.

Subject invention

1. Installation - for casting with pressure of compressed gava of rivets of Illy of other parts, characterized in that, in order to ensure during casting (Directional crystallization, the mold for castings is made of three different parts (different in thermal conductivity of the parts - the least heat-conducting ligonic plate B, immersed in the poured bake; metal metal, its own form 7 of steel and the most gel-conducting-massive copper. Dne-Kokil 8. 2. In yiCTaiHQiBiKe according to claim 1, to reduce heat transfer from the casting plate 6 to form 1--8 : Ski gusts paint.