CN105710300A - Yoke casting method - Google Patents
Yoke casting method Download PDFInfo
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- CN105710300A CN105710300A CN201410741895.4A CN201410741895A CN105710300A CN 105710300 A CN105710300 A CN 105710300A CN 201410741895 A CN201410741895 A CN 201410741895A CN 105710300 A CN105710300 A CN 105710300A
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Abstract
The invention relates to a yoke casting method. A refractory material is replaced by ceramic wear-resistant particles, a liquid paint prepared from the ceramic wear-resistant particles and an adhesive is coated on the surface of a die, a pattern die is made, a wax die is fused, alloy liquid is filled, and a casting is formed with the cooling and condensation of the filled alloy liquid. Ceramic wear-resistant particles are led to the surface of the casting, and then, thermal treatment is carried out to increase a ceramic hardened layer on the surface of the casting, so that the surface hardness of the casting is improved. By adopting the casting method, the casting is formed at a time, the surface is smooth, the size is accurate, and a little cutting or non-cutting purpose can be achieved. The hardness of the surface provided with the ceramic hardened layer is greatly improved, so that the method is particularly suitable for preparing alloy castings requiring high surface hardness, such as yokes.
Description
Technical field
The present invention relates to a kind of casting method, specifically, relate to a kind of yoke casting method.
Background technology
Yoke is usually employing high strength steel, is first processed as yoke base, then carries out the technical processs such as machining, the processing of yoke shape, heat treatment, polish and make, and process cycle is long, and processing technique is complicated, and machining difficulty is big.And requiring that the yoke torsional fatigue strength prepared is high, case hardness is high, and wearability is good.
Casting is one of main method of manufactured parts blank, it it is preparation method quite efficiently, part particularly with some brittle metal or alloy material, the processing method that foundry engieering is commonly used especially, its forming principle is: METAL HEATING PROCESS melted so that it is have mobility, is then poured in the effigurate casting mold die cavity of tool, under the effect of gravity or external force, it is full of die cavity, cools down and be frozen into foundry goods or part.
Traditional casting technique generally comprises following steps: a, shape according to product make the apperance of molding and core making；B, apperance is put in sandbox, carry out mould assembling after back-up sand, consolidation, molding；C, by fusing after liquid metal be poured in the die cavity in sandbox；D, peeling foundry goods.
At present, traditional casting technique all needs substantial amounts of manpower when the preparation of molding sand, in the manufacturing process of sand mold and in the peeling foundry goods in later stage, and labor intensity is relatively big, wastes a large amount of valuable human resources, casting each product to be required for repeating above-mentioned operation, production efficiency is low simultaneously.Based on drawbacks described above, the present invention is directed to the feature of yoke, it is provided that the yoke casting method of a kind of improvement.
Summary of the invention
It is an object of the invention to provide a kind of casting method that can be used for yoke.
Casting method of the present invention is the investment casting method improved, and model casting is also known as " lost-wax casting ".This method is that easy fusible pattern material is injected die mould (in mould), makes fusible pattern, it is assembled into module, is then coated with the liquid coating that application refractory material and binding agent are made on module surface, then spreads fire-resistant sand grains on coating, subsequently so as to shelling of hardening.So repeated multiple times, just form multilamellar shell.Shell is heated, makes fusible pattern be melted out, after housing is fired, toward wherein pouring into liquid alloy, after solidification, namely obtain foundry goods through operations such as cleanings.
Based on the requirement to yoke, namely torsional fatigue strength is high, and case hardness is high, wearability is good, the present invention is using ceramic wear-resisting granule as refractory material, and the liquid coating that binding agent is made into is coated in module surface, makes pattern, inject alloy liquid, along with the cooled and solidified of the alloy liquid injected forms foundry goods, ceramic wear-resisting granule is introduced cast(ing) surface, subsequently heat-treated, make cast(ing) surface increase by one layer of ceramic hardened layer, improve the case hardness of foundry goods.
Specifically, the casting method that invention is described, comprise the following steps:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, described model is formed coating, dry；
2) to step 1) described coating on the slurry that constitutes of sprayable refractory granule or coating refractory material granule and colloidal liquid binder, dry；
3) molten mistake fusible pattern, Baking；
4) alloyage material, alloy material melting, cast；
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings.
Described colloidal liquid binder is one or both mixture of polyacrylamide and polyacrylate；
In the slurry that ceramic particle and colloidal liquid binder are constituted, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.1-10；Preferred 1:0.3-1.
Adopting model casting, foundry goods is once-forming, and any surface finish, size are accurate, it is possible to reach few cutting or the purpose without cutting, and surface has ceramic hardened layer, and hardness is greatly improved, and being particularly suitable for preparing gear etc. needs the alloy-steel casting of high surfaces hardness.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further.As without specializing, the raw material used by the present invention is commercial.
Embodiment 1
According to following steps, cast yoke sample:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, on described model, form coating, spray drying whereby；Described ceramic particle can be carborundum, silicon nitride or tungsten carbide, granule be sized to 20-50 μm；Described colloidal liquid binder is polyacrylamide；In the slurry that ceramic particle and colloidal liquid binder are constituted, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.1；
Wherein, step 1) repeat 3 times；
2) to step 1) described coating on the slurry that constitutes of coating refractory material granule and colloidal liquid binder, spray drying；Wherein, described refractory material is silicon dioxide；The weight ratio that described fire resisting material particle forms material with gelling is 100:5；
Wherein, step 2) repeat 2 times；
3) 1 hour molten mistake fusible pattern of 200 DEG C of insulations, Baking；；
4) alloyage material, chemical composition is in Table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1580 DEG C, and pouring temperature is 1530 DEG C；
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings: 860 DEG C insulation 1 hour after oil quenching, 500 DEG C insulation 1 hour after furnace cooling.
Claims (2)
1. yoke casting method, it is characterised in that comprise the following steps:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, on described model, form coating whereby, dry；
2) to step 1) described coating on the slurry that constitutes of sprayable refractory granule or coating refractory material granule and colloidal liquid binder, dry；
3) molten mistake fusible pattern, Baking；
4) alloyage material, alloy material melting, cast；
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings；Described colloidal liquid binder is one or both mixture of polyacrylamide and polyacrylate.
2. gear casting method according to claim 1, it is characterised in that in the slurry that ceramic particle and colloidal liquid binder are constituted, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.1-10；Preferred 1:0.3-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410741895.4A CN105710300A (en) | 2014-12-05 | 2014-12-05 | Yoke casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410741895.4A CN105710300A (en) | 2014-12-05 | 2014-12-05 | Yoke casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105710300A true CN105710300A (en) | 2016-06-29 |
Family
ID=56144302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410741895.4A Pending CN105710300A (en) | 2014-12-05 | 2014-12-05 | Yoke casting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105710300A (en) |
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2014
- 2014-12-05 CN CN201410741895.4A patent/CN105710300A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160629 |
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| WD01 | Invention patent application deemed withdrawn after publication |