CN105642874A

CN105642874A - Pouring technology for bearing alloy

Info

Publication number: CN105642874A
Application number: CN201410723690.3A
Authority: CN
Inventors: 银琦
Original assignee: Chongqing Xuxinyue Nc Machinery Co Ltd
Current assignee: Chongqing Xuxinyue Nc Machinery Co Ltd
Priority date: 2014-12-04
Filing date: 2014-12-04
Publication date: 2016-06-08

Abstract

The invention discloses a pouring technology for bearing alloy. The pouring technology comprises the steps of 1, fully stirring alloy liquid before pouring, leaving the alloy liquid to stand for 2-4 minutes and clearing dross, wherein the pouring temperature of tin-antimony alloy ranges from 400 DEG C to 440 DEG C; 2, preheating all pouring tools to 150-200 DEG C before pouring and taking out dies preheated to 270-300 DEG C; 3, in the pouring process, guaranteeing that the temperature of the inner surfaces of the dies is always higher than the temperature of a steel shell bearing bush surface because the temperature decides the condensation direction of the liquid alloy; 4, for completing the pouring process, placing a die base on a platform before pouring, immediately pouring molten babbitt metal into an iron ladle preheated to 270-300 DEG C for carrying out casting after preparation work is completed, controlling the speed to be low at the initial stage of pouring, gradually increasing the speed and cooling the alloy through quenching and slow cooling after pouring is completed.

Description

A kind of pouring technology of bearing metal

Technical field

The present invention relates to the pouring technology of a kind of bearing metal.

Background technology

The pouring technology of current bearing metal is more complicated, also without unified specification, it does not have unified standard, cause ultimogenitary bearing quality uneven, a lot of operations that repeat also make under production efficiency, increase the work burden of workman, make the competitiveness of product in market not high simultaneously. For some operators just entered a profession, it does not have a clear and definite method technique, cause, when operation, mistakes and omissions often occur, in some instances it may even be possible to cause serious consequence.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved is to provide the pouring technology of a kind of bearing metal, and this pouring technology method is simple, eliminates a lot of repeatability operation, improves work efficiency, and the bearing quality of production is good.

For achieving the above object, the invention provides a kind of bearing alloy casting process, it is characterised in that comprise the steps, 1) it is sufficiently stirred for aluminium alloy before cast, stand 2��4min, scum silica frost is cleaned out. Its tin pewter pouring temperature is 400��440 DEG C;

2) before casting, instrument of all pouring into a mould is preheating to 150��200 DEG C, the mould taking-up of 270��300 DEG C will be preheating to, and the box hat of tining assembles, in order to prevent babbit from spilling when casting, available clay 65% of pressing, Sal 17%, the coating of water 18% proportioning modulation seals;

3) during cast, temperature decides the condensation direction of liquid alloy, ensure that mould inner surface temperature is consistently higher than the temperature in box hat bearing shell face, so will increase liquid alloy and press to the condensing power in bearing shell face, thus obtaining bonding reliable, the good alloy-layer of compactness, the cast of alloy adopts static casting, and static casting can adopt the method for static upright direct casting---and-babbit the liquid that is up to uniform temperature fills rapidly die cavity continuously;

4) casting process: first mold base is placed on platform before (1) casting, then through being preheated to 250��300 DEG C. In order to coring is convenient, can being coated with one layer of graphite powder and gasoline mixture or one layer of chromium of plating on plug, rod core should twine blank sheet of paper, and so after cooling of having cast, plug is easily drawn out;

(2) after preparation completes, the babbit melted is poured into be pre-heated in the ferrum spoon of 270��300 DEG C to cast immediately.Now, alloy solution first flows in dies cavity, is full of after alloy solution until dies cavity, is just uniformly injected in tire along the outer surface of plug, more slowly steadily rises. Air is made to discharge, nonmetal impurities emersion liquid level. This method, not only simple but also can guarantee that quality, therefore widely used;

(3) should not be too fast when starting to pour into a mould, speed should be accelerated gradually, and conventional scarfing cinder iron staff removes the slag on melted alloy surface, foreign material, in order to avoid in foreign body being poured into watt, the bearing shell hanging stannum is as far as possible short to the time of casting, is usually no more than 8 seconds, in order to avoid oxidation;

(4) after cast, the cooling of alloy adopts chilling and slow cooling two step to carry out; Chilling is usually employing room temperature cold water and uniformly cools down bearing casing cabable middle and lower part; Then adopt slow cooling, refer to that the alloy being cooled to solid-state is by 200 DEG C of processes naturally cooling to room temperature in atmosphere; It is fully cooled to ability collapsible die after room temperature until bearing shell; Slow cooling in order that reduce internal stress, it is prevented that deformation and alloy shelling.

The invention has the beneficial effects as follows: pouring technology method of the present invention is simple, eliminating a lot of repeatability operation, improve work efficiency, the bearing quality of production is good.

Detailed description of the invention

Technical scheme disclosed by the invention is a kind of bearing alloy casting process, it is characterised in that comprise the steps, 1) it is sufficiently stirred for aluminium alloy before cast, stand 2��4min, scum silica frost is cleaned out. Its tin pewter pouring temperature is 400��440 DEG C;

(2) after preparation completes, the babbit melted is poured into be pre-heated in the ferrum spoon of 270��300 DEG C to cast immediately. Now, alloy solution first flows in dies cavity, is full of after alloy solution until dies cavity, is just uniformly injected in tire along the outer surface of plug, more slowly steadily rises. Air is made to discharge, nonmetal impurities emersion liquid level. This method, not only simple but also can guarantee that quality, therefore widely used;

(4) after cast, the cooling of alloy adopts chilling and slow cooling two step to carry out; Chilling is usually employing room temperature cold water and uniformly cools down bearing casing cabable middle and lower part;Then adopt slow cooling, refer to that the alloy being cooled to solid-state is by 200 DEG C of processes naturally cooling to room temperature in atmosphere; It is fully cooled to ability collapsible die after room temperature until bearing shell; Slow cooling in order that reduce internal stress, it is prevented that deformation and alloy shelling.

This pouring technology method is simple, eliminates a lot of repeatability operation, improves work efficiency, and the bearing quality of production is good.

The preferred embodiment of the present invention described in detail above. Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work. Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims

1. a bearing alloy casting process, it is characterised in that comprise the steps, 1) it is sufficiently stirred for aluminium alloy before cast, stand 2��4min, scum silica frost is cleaned out, its tin pewter pouring temperature is 400��440 DEG C;

2) before casting, instrument of all pouring into a mould is preheating to 150��200 DEG C, the mould taking-up of 270��300 DEG C will be preheating to, and the box hat of tining assembles, in order to prevent babbit from spilling when casting, available clay 65% of pressing, Sal 17%, the coating of water 18% proportioning modulation seals; 3) during cast, temperature decides the condensation direction of liquid alloy, ensure that mould inner surface temperature is consistently higher than the temperature in box hat bearing shell face, so will increase liquid alloy and press to the condensing power in bearing shell face, thus obtaining bonding reliable, the good alloy-layer of compactness, the cast of alloy adopts static casting, and static casting can adopt the method for static upright direct casting---and-babbit the liquid that is up to uniform temperature fills rapidly die cavity continuously; 4) casting process: first mold base is placed on platform before (1) casting, then through being preheated to 250��300 DEG C; In order to coring is convenient, can being coated with one layer of graphite powder and gasoline mixture or one layer of chromium of plating on plug, rod core should twine blank sheet of paper, and so after cooling of having cast, plug is easily drawn out; (2) after preparation completes, the babbit melted is poured into be pre-heated in the ferrum spoon of 270��300 DEG C to cast immediately; Now, alloy solution first flows in dies cavity, is full of after alloy solution until dies cavity, is just uniformly injected in tire along the outer surface of plug, slowly steadily rise again, make air discharge, nonmetal impurities emersion liquid level, this method, not only simple but also can guarantee that quality, therefore widely used; (3) should not be too fast when starting to pour into a mould, speed should be accelerated gradually, and conventional scarfing cinder iron staff removes the slag on melted alloy surface, foreign material, in order to avoid in foreign body being poured into watt, the bearing shell hanging stannum is as far as possible short to the time of casting, is usually no more than 8 seconds, in order to avoid oxidation; (4) after cast, the cooling of alloy adopts chilling and slow cooling two step to carry out; Chilling is usually employing room temperature cold water and uniformly cools down bearing casing cabable middle and lower part; Then adopt slow cooling, refer to that the alloy being cooled to solid-state is by 200 DEG C of processes naturally cooling to room temperature in atmosphere; It is fully cooled to ability collapsible die after room temperature until bearing shell; Slow cooling in order that reduce internal stress, it is prevented that deformation and alloy shelling.