CN202239575U - Pie-shaped pouring channel for annular casting - Google Patents

Abstract

The utility model discloses a pouring channel design for a large-diameter aluminum ring. A pouring channel is formed by combining a pie-shaped pouring channel of 8-10 millimeters in thickness and six trapezoidal pouring channels. A product poured according to the pouring channel has small deformation after pouring, the phenomena of shrinkage cavities, shrinkage porosity and the like of a casting are avoided, and the delivery requirement of the product can be met completely.

Description

A kind of cheese running channel of annular cast

Technical field

The present invention relates to the Design of Runner System of low pressure metal mould, belong to the liquid condition shaping field of metal material.

Background technology

Along with the voltage of high voltage power transmission and transforming progressively develops to 220KV; The size of annular brace ring also rises to about Φ 730mm from Φ 500mm in the circuit; Whole world high-voltage electrical apparatus producer all competitively develops the support ring of Φ 730mm; The support ring of original Φ 500mm is all comparative maturities of casting aspect or machined aspect; On the basis of Φ 500mm support ring, carry out the trial-production of Φ 730mm support ring,, consider further the increasing of support ring aluminium ring of Φ 730mm with the aluminium amount because the support ring of original Φ 500mm is the trapezoidal running channel that adopts " ten " font of Fig. 1; Space empty in the middle of the support ring is bigger; Aluminium liquid further increases from the distance that middle cast gate arrives peripheral aluminium ring, and liquid aluminium is frozen in long running channel more easily, and the degree of difficulty that liquid aluminium arrives the aluminium ring further strengthens; The trapezoidal running channel of original " ten " font can not satisfy the aluminium liquid of Φ 730mm support ring far away to be carried, and the conveying of the aluminium liquid of Φ 730mm aluminium ring just might be satisfied in the path that must increase the conveying of aluminium liquid.Therefore be designed to the trapezoidal running channel of " ten " font of image pattern 1 during designing mould the trapezoidal running channel of " rice " font of Fig. 2; The aluminium liquid of in casting process, carrying like this is 2 times that the trapezoidal running channel of original " ten " font is carried aluminium; But because running channel lengthening; And aluminium liquid loss of heat in metal pattern is very fast, and aluminium liquid meeting in the running channel and the aluminium liquid in the aluminium ring solidify simultaneously or solidifies one step ahead than the aluminium liquid in the aluminium ring, and the aluminium liquid in the aluminium ring can not get feeding timely in process of setting; So shrinkage cavity, shrinkage porosite phenomenon can appear in aluminium ring inside after finding machined after the trial-production, the running channel of increase still can not satisfy the feeding capacity of foundry goods.

The utility model content

The problem that the utility model will solve is can be transported to aluminium liquid the aluminium ring from what middle cast gate was guaranteed both quality and quantity under the situation how empty space is strengthened in the middle of support ring; And guarantee that support ring is indeformable when heat treatment; Phenomenons such as shrinkage cavity, shrinkage porosite can not occur, meet the product quality of drawing requirement.

For solving the problems of the technologies described above; The cheese running channel of the utility model has comprised the running channel 3 of the patty that middle 8-10mm is thick and 6 trapezoidal running channels 2 of optimal design; Cake type running channel 3 is supported by 6 trapezoidal running channels 2, in casting solidification process, together the annular cast that is solidifying is carried out feeding by cheese running channel 3 and 6 trapezoidal running channels 2, like this along with the aluminium liquid of carrying can be run into metal die less in the space of middle cake running channel; Thermal loss reduces; Aluminium liquid can be owing to solidifying conduct heat for metal die too much in course of conveying, so the aluminium flow is moving very smooth and easy, and required aluminium liquid measure when having the additional aluminium ring of enough aluminium water to solidify.

The advantage that experiment showed, the utility model has promptly solved the defective when aluminium casting is poured into a mould, and guarantees that annular cast is heat treated indeformable, the aluminium consumption when as far as possible reducing casting again.

Description of drawings

Be further described below in conjunction with the embodiment of accompanying drawing the utility model.

Fig. 1 is the trapezoidal running channel of " ten " font.

Fig. 2 is the trapezoidal running channel of " rice " font.

Fig. 3 is that the cheese running channel merges 6 trapezoidal muscle running channels.

Fig. 4 is the foundary methods drawing of annular brace ring.

The specific embodiment

Fig. 4 is the foundary methods drawing of annular brace ring; Form by patrix 5, core 6, counterdie 7 three parts; The location of core is to be placed in patrix 5 through location core print 4, and it is 50mm that patrix 5 is drilled with the phase mutual edge distance, the core steam vent 8 of Φ 5mm; Patrix 5 adopts workpiece alignment pin location with counterdie 7; Upper and lower mould is heated before cast and is made metal pattern reach 150 ℃-200 ℃ spraying temperature, sprays the special-purpose primer of metal mold, fully sprays graphite coating materials continued after the oven dry metal pattern is heated to pouring temperature.Be transported in the holding furnace of air injection machine after aluminium liquid in the smelting furnace meets the requirements through refining, thermometric simultaneously; Patrix, core, counterdie close up, and air injection machine is pressurized to 0.4-0.5 atmospheric pressure, fill 25 seconds-35 seconds type duration; This moment, aluminium liquid was owing to pressure is arrived on the aluminium rings via stalk, cast gate 9, cheese running channel 3 and 6 trapezoidal running channels 2 by holding furnace; Be full of metal mold cavity, increase pressure to 1.5 atmospheric pressure rapidly, the liquid aluminium in cheese running channel 3 and the 6 trapezoidal running channels 2 carries out feeding to the aluminium ring that is solidifying jointly under 1.5 atmospheric effects; Pressurize pressure release form removal after 220 seconds-260 seconds, a support ring is accomplished cast.Treat to heat-treat after foundry goods cools off clear drop core,, hindered the various distortion of aluminium ring in heat treatment like this because the cheese running channel 3 of workpiece is not removed.Carry out machined after the heat treatment; Can as removing cast gate, remove just passable for cheese running channel 3; And the aluminium of the cheese running channel that removes and 6 trapezoidal running channels can also melt down utilization again as the one-level foundry returns; Machine adds the inspection of punching back and does not find that shrinkage cavity, shrinkage porosite phenomenon are arranged, and explains that added cheese running channel 3 is effectively, satisfies the cast requirement of the support ring of Φ 730mm fully.

Another design philosophy of this utility model is to be designed to the same thick cake with support ring to the cheese running channel, is certain to satisfy the cast requirement of product like this, but all uses the waste of words aluminium of cake running channel very big on the one hand; Utilize though can melt down again, melt down in the process and can use fuel more, and aluminium melt down in the process also can some scaling loss; It is surprising to water the support ring weight that outpours on the other hand; The workman is very inconvenient when operation, can cause artificial waste like this, cost waste; Such design is excessive, so be not optimal design.

Claims (2)

1. the cheese running channel of an annular cast; It is characterized in that its patty running channel (3) is supported by 6 trapezoidal running channels (2), and in casting solidification process, together the annular cast that is solidifying is carried out feeding by cheese running channel (3) and 6 trapezoidal running channels (2).

2. cheese running channel as claimed in claim 1 (3) is characterized in that its thickness is 8-10mm.

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