CN1069072C - Manufacture of wear resisting product - Google Patents
Manufacture of wear resisting product Download PDFInfo
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- CN1069072C CN1069072C CN99120823A CN99120823A CN1069072C CN 1069072 C CN1069072 C CN 1069072C CN 99120823 A CN99120823 A CN 99120823A CN 99120823 A CN99120823 A CN 99120823A CN 1069072 C CN1069072 C CN 1069072C
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- solid slurry
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- semi solid
- slurry
- geat
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Abstract
The present invention relates to a semi-solid casting method of wear resisting products. A qualified alloy liquid after being smelted is poured into a preparing chamber of semi-solid slurry under the condition that the temperature is 10 to 20 DEG C higher than the liquidus temperature; semi-solid slurry is poured into a metal mold from the preparing chamber of slurry; the semi-solid slurry is pressurized by a pressing machine in the extruding procedure from a pouring hole and is maintained for a certain period; the semi-solid slurry is solidified into a wear resisting product of a certain shape under the action of pressure; the mold is opened; the workpiece is taken out; a heat treatment is carried out. The present invention has the advantages of continuous operation, short technological process, high productive efficiency, less energy consumption and long service life of molds.
Description
The present invention relates to a kind of semi-solid casting making method of anti-friction material goods.
In the prior art, wear resisting product mainly is to produce with the conventional cast method, mainly contains following deficiency, be rising head must be set come complementary contraction, thereby product yield has only 55～80%; The 2nd, abnormal destruction takes place in wear resisting product internal flaw incidence height easily in the use.Forge and mechanism method also can be produced some wear resisting product, but owing to the anti-friction material plastic deformation ability is poor, they answer scope less.Compression casting and extrusion casint (claiming liquid forging again) are decided in the journey filling type and solidifying subsequently, apply an external force and improve the feeding effect, improve workpiece interior solid degree, but in these two kinds of methods, be the pure liquid state that temperature is higher than liquidus curve when material enters die cavity, impact and mechanical erosion to mould are serious, thereby die life is short, and because its solid phase of solidifying formation mostly is tree skill crystalline substance, thereby commutation resembles seriously partially, easily produce internal fissure, the workpiece serviceability is still not high.The semi-solid alloy forming technique of early seventies invention is form and the quantity by solid phase in the solidliquid mixture of control solid-liquid coexistence temperature range, make this solidliquid mixture have good flowability, and utilize this flowability to carry out a class new technology of moulding by casting.The semisolid extruding is exactly wherein a kind of, existing semisolid extrusion technique mainly is at first to prepare the semi solid slurry that contains the subsphaeroidal solid phase of non-dendrite, and pour into ingot blank, after again ingot badly being reheated semi-solid temperature when needing, fill the type cooling forming under pressure, obtain the blank of machine components.The shortcoming of this semisolid extrusion technique is that twice heating increased energy resource consumption, makes the interior tissue alligatoring easily, and mold still uses cast gate, rising head, and product yield is lower.However present this method only is used for the lower non-ferrous alloy of fusing point, and the wear resisting iron or steel material melting point is higher, and difficult forming is not seen and adopted the method to come moulding.
The object of the present invention is to provide a kind of one-time continuous moulding, technological process is short, productivity ratio, the wear resisting product semi-solid casting making method that product yield is high.
Another purpose of the present invention provides a kind of high-melting-point steel and alloy such as white cast-iron, potassium steel, rich chromium cast iron, the semi-solid casting making method of goods such as medium managese steel.
The present invention is achieved in that the qualified alloy liquid of melting is pouring into the semi solid slurry preparation room under 10～20 ℃ of conditions more than the liquidus temperature, in its top-down motion and whipping process, alloy liquid is subjected to the cooling of semi solid slurry preparation room, form semi solid slurry, when arriving the pulping chamber outlet, solid phase in the semi solid slurry is the subsphaeroidal particle of non-dendrite, and be uniformly distributed in the liquid phase, semi solid slurry injects metal die from pulping chamber, under the refrigeration of metal die, solidify rapidly; Forcing press in the extrusion process pressurizes to it from the geat of metal die, and keeps certain hour, makes semi solid slurry feeding under pressure and further solidifies the wear resisting product that forms definite shape, opens mould subsequently, takes out workpiece and heat-treats.
The present invention compared with prior art has following advantage: 1) with the preparation of semi solid slurry, fill type, extruding and heat treatment and once finish, realized working continuously, technological process is short, the production efficiency height, energy resource consumption is few; 2) materials behavior that enters the metal die cavity is not pure liquid state, but contains the solidliquid mixture of the subsphaeroidal solid phase of non-dendrite, and it fills the type temperature and obviously reduces, thereby die life is long; 3) without riser feeding, but under the metal crimp of outer power with geat, force feeding, realized the densified of workpiece, thereby saved cast gate of the prior art, rising head, product yield can reach absolutely; 4) because technological design is reasonable, can pour into a mould dystectic steel and alloy goods, as abrading-ball, liner plate, the grid section of ball mill, grinder hammerhead, excavator bucket teeth, caterpillar conveyer creeper tread etc.
Below the present invention is described in detail.
The qualified alloy liquid of melting is pouring into the semi solid slurry preparation room under 10～20 ℃ of conditions more than the liquidus temperature, the pulping chamber inwall is made firm by ramming with refractory material and is formed, outer wall is wound with cooling jacket, be used for regulating the intensity of cooling of pulping chamber, and then the fraction solid of control pulping chamber exit semi solid slurry, fraction solid is too high, is difficult to fill smoothly type, crosses low enough nearly spheroidal structures of non-dendrite that is difficult to again form.In its top-down motion and whipping process, alloy liquid is subjected to the cooling of semi solid slurry preparation room, forms semi solid slurry.The agitator that pulping chamber is used can be a mechanical agitator, also can be magnetic stirrer.When arriving the pulping chamber outlet, the solid phase in the semi solid slurry is the subsphaeroidal particle of non-dendrite, and is uniformly distributed in the liquid phase.Semi solid slurry injects metal die from pulping chamber, under the refrigeration of metal die, solidifies rapidly.The operating temperature of metal die is regulated by being installed in its inner cooling water system, makes it remain on 200～250 ℃ of scopes.The geat volume V of metal die
GeatAccording to mold cavity volume V
Die cavity, the cubical contraction ε s of semi solid slurry and pulping chamber exit semisolid be the fraction solid F of material
SCDetermine that its formula is V
Geat=ε sV
Die cavity(1-F
SC).The interior open ended semi solid slurry volume of geat equals the interior semi solid slurry of mold cavity and is transformed into the solid-state body contraction that produces, therefore when the semi solid slurry in the geat all is pressed into mold cavity, just can hang down the Volume Changes that the solidification shrinkage that disappears is brought, obtain no shrink defects, the workpiece of no cast gate, rising head.Forcing press in the extrusion process pressurizes to it from the geat of metal die, and keeps certain hour, makes semi solid slurry feeding under pressure and further solidifies the wear resisting product that forms definite shape.The forcing press that extrusion process is used can have the hydraulic press of pressure holding function, also can be punching machine, and the specific pressure that requires to act on the interior semi solid slurry of metal die geat is 80～120MPa.Open mould subsequently, take out workpiece and heat-treat.Heat treatment comprises quenches and tempering, and the quenching and tempering technological parameter changes with the anti-friction material kind is different.It does not need to be outer thermal source to reheat with the essential different of prior art, cools off and obtains quenching structure but utilize waste heat after the workpiece depanning to carry out air cooling, water-cooled, oil cooling or salt bath.
Abrading-ball production technology with ball mill is that the invention will be further described for example below.
Utilize medium-frequency induction furnace melting composition to be: C:2.8%, Si:1.0%, Mn:0.7%, C
2: 3%, P, S≤0.15%, Mo:0.4%, B:0.002%, surplus is that the network of iron is a white iron, more than liquidus temperature, pour under 15 ℃ in the pulping chamber of making of quartz sand, start magnetic stirrer simultaneously, rotating speed with 1160rPmin carries out contactless stirring, stirs after 2 minutes, and beginning is one by one injected in the abrading-ball mold cavity of φ 80 continuously, change extrusion process after mould is filled with one by one over to, on 80 tons of punching machines, carry out the semisolid extruding by geat.Above-mentioned geat size is V by formula
Geat=ε sV
Die cavity(1-F
SC) after the calculating, be designed to 25 * 19 millimeters of φ.The extruding pressurize is the die sinking cooling after 5 seconds, and oil quenching when the abrading-ball temperature arrives 850 ℃ then carried out temper in 4 hours 230 ℃ of insulations.Calculating shows by statistics, and its stock utilization is up to a hundred per cent, and the internal flaw incidence is zero, and abrading-ball hardness is 58HRC, impact flexibility a
k=9.5J/cm
2, 3.5 meters height falling ball impact test number of times reach 13000 times not to be destroyed, and productivity ratio is 24kg/min.
Claims (6)
1, a kind of casting method of wear resisting product, it is characterized in that: the qualified alloy liquid of melting is pouring into the semi solid slurry preparation room under 10～20 ℃ of conditions more than the liquidus temperature, in its top-down motion and whipping process, alloy liquid is subjected to the cooling of semi solid slurry preparation room, form semi solid slurry, when arriving the pulping chamber outlet, solid phase in the semi solid slurry is the brilliant subsphaeroidal particle of non-skill, and be uniformly distributed in the liquid phase, semi solid slurry injects metal die from pulping chamber, under the refrigeration of metal die, solidify rapidly; Forcing press in the extrusion process pressurizes to it from the geat of metal die, and keeps certain hour, makes semi solid slurry feeding under pressure and further solidifies the wear resisting product that forms definite shape, opens mould subsequently, takes out workpiece and heat-treats.
2, casting method according to claim 1 is characterized in that: utilize the water jacket of pulping chamber outer wall to control half fraction solid because of the attitude slurry in the pulping chamber, form the brilliant nearly spheroidal structure of enough non-skills.
3, casting method according to claim 1 is characterized in that: the forcing press of extrusion process is 80～120MPa to the specific pressure of semi solid slurry in the mould.
4, casting method according to claim 1 is characterized in that: the volume V of mould geat
GeatAccording to mold cavity volume V
Die cavity, the cubical contraction ε s of semi solid slurry and system be the fraction solid F of exit, chamber semi solid slurry
SCDetermine its Gongwei: V
Geat=ε sV
Die cavity(1-F
SC).
5, according to claim 1 or 4 described casting methods, it is characterized in that: utilize the water-cooling system of mould to keep mould 200～250 ℃ of scopes.
6, casting method according to claim 1 is characterized in that: heat treatment step is arranged in after the workpiece depanning, utilizes the waste heat of workpiece to quench and tempering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99120823A CN1069072C (en) | 1999-09-22 | 1999-09-22 | Manufacture of wear resisting product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99120823A CN1069072C (en) | 1999-09-22 | 1999-09-22 | Manufacture of wear resisting product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1249970A CN1249970A (en) | 2000-04-12 |
| CN1069072C true CN1069072C (en) | 2001-08-01 |
Family
ID=5281692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99120823A Expired - Fee Related CN1069072C (en) | 1999-09-22 | 1999-09-22 | Manufacture of wear resisting product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1069072C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323782C (en) * | 2003-11-20 | 2007-07-04 | 北京有色金属研究总院 | Method of preparing semi solid state moltem metal/blank by ultrasonic treatment to control solidification and its device |
| SE531606C2 (en) * | 2007-11-14 | 2009-06-02 | Skf Ab | A process for forming steel |
| CN102756108B (en) * | 2012-06-27 | 2014-10-15 | 西安交通大学 | Semi-solid extruding and casting molding mould of compressor crankshaft and molding process |
| CN102756113A (en) * | 2012-07-28 | 2012-10-31 | 亚太轻合金(南通)科技有限公司 | Casting method of semi-solid state aluminum alloy cast rod for extrusion molding |
| CN104862579A (en) * | 2014-02-26 | 2015-08-26 | 铜陵有色金神耐磨材料有限责任公司 | Grinding ball and manufacturing method thereof |
| CN107159867B (en) * | 2017-04-11 | 2019-05-14 | 华南理工大学 | High pressure rapid cooling prepares the method and device of metal material |
| CN107470583B (en) * | 2017-08-15 | 2019-06-04 | 北京交通大学 | The semi-solid rheological squeeze casting mould and casting method of high-speed rail brake disc |
| CN112113233A (en) * | 2020-09-23 | 2020-12-22 | 苏州格林热能设备有限公司 | Fire grate structure of combustion furnace |
| CN112146113A (en) * | 2020-09-28 | 2020-12-29 | 苏州格林热能设备有限公司 | Improved fire grate of combustion furnace |
| CN112593061A (en) * | 2020-11-18 | 2021-04-02 | 贵州鼎成熔鑫科技有限公司 | Quenching and tempering method for hydraulic plunger pump and motor double-metal cylinder body spline |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122115A (en) * | 1994-01-17 | 1996-05-08 | 皮奇尼铝公司 | Semi-solid metal forming method |
-
1999
- 1999-09-22 CN CN99120823A patent/CN1069072C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122115A (en) * | 1994-01-17 | 1996-05-08 | 皮奇尼铝公司 | Semi-solid metal forming method |
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| CN1249970A (en) | 2000-04-12 |
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