CN107511485A - The processing method of hollow body metal parts - Google Patents
The processing method of hollow body metal parts Download PDFInfo
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- CN107511485A CN107511485A CN201710750058.1A CN201710750058A CN107511485A CN 107511485 A CN107511485 A CN 107511485A CN 201710750058 A CN201710750058 A CN 201710750058A CN 107511485 A CN107511485 A CN 107511485A
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- hollow body
- processing method
- subassembly
- blank
- metal parts
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention, which discloses, is related to metal parts processing technique field, especially a kind of processing method of hollow body metal parts, a, the drawing according to parts to be processed, part is divided into multiple subassemblies, and draw the drawing of each subassembly respectively；B, according to the drawing of each subassembly, make respectively corresponding to mould；C, metal dust and binding agent are well mixed, are then prepared into feed pellet；D, feed pellet is expelled in each mould using injection moulding machine, subassembly blank corresponding to formation；E, by each subassembly blank by being welded to connect, so as to constituent part blank；F, part blank is put into sintering furnace carry out it is degreasing sintered, sintering completion obtain finished product.The invention provides a kind of processing method of hollow body metal parts, the product quality of production is good, qualification rate is high.
Description
Technical field
The present invention relates to metal parts processing technique field, especially a kind of processing method of hollow body metal parts.
Background technology
Metal injection molded technology (Metal Injection Molding, abbreviation MIM) is a kind of from injection-moulding plastic
The novel powder metallurgy forming technique extended out in industry.It is well known that the production prices of Plastics Injection Molding Technology are cheap,
Variously-shaped complicated product can be produced, but plastic products intensity is not high, can be by plastic raw materials in order to improve its performance
Metal or ceramic powders are added to improve the intensity of product and wearability.In recent years, development evolvement is maximum to this idea
Limit must improve the content of solids and in subsequent sintering process completely except no-bonder causes the blank after shaping
Densification, it is metal injection molded technology.Metal injection molded basic process steps are：Choose first and meet MIM requirements
Metal dust and binding agent, metal dust and binding agent are mixed into by uniform feed using appropriate method at a certain temperature
Material, be then injection moulded after granulation, acquisition into parison, sintering densification obtains finished product after ungrease treatment.
Powder injection-molded technology have can one-shot forming go out that complex-shaped workpiece, dimensional accuracy are high, are easily achieved
The advantages that high-efficiency automatic produces, it is particularly suitable for high-volume and manufactures complex-shaped, high-precision, high performance small-sized machine zero
Part, it has also become fast-developing new technology.But current metal injection molded technology is substantially all for producing small-sized solid machine
Tool parts, and problems be present in the metal parts production for hollow body：Due to being hollow for hollow body part, adopt
Prepared with powder injection-molded technology and do not break through key technology also, it is impossible to straight forming, traditional technique can only be used, it is traditional
The hollow body part that technique productions go out is easily cracked, deformation, or even can not be molded, and has a strong impact on sintered article quality, gives up
Product rate is too high, low production efficiency.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of processing method of hollow body metal parts, the product of production
Quality is good, qualification rate is high.
The processing method of hollow body metal parts, comprises the following steps used by its technical problem of present invention solution：
A, according to the drawing of parts to be processed, part is divided into multiple subassemblies, and draw the figure of each subassembly respectively
Paper；
B, according to the drawing of each subassembly, make respectively corresponding to mould；
C, metal dust and binding agent are well mixed, are then prepared into feed pellet；
D, feed pellet is expelled in each mould using injection moulding machine, subassembly blank corresponding to formation；
E, by each subassembly blank by being welded to connect, so as to constituent part blank；
F, part blank is put into sintering furnace carry out it is degreasing sintered, sintering completion obtain finished product.
It is further that parts to be processed is shaped as axisymmetric shape, the axle centered on the symmetry axis of parts to be processed, point
For two subassemblies of identical.
It is further that parts to be processed is shaped as circular or ellipse.
It is further that in step c, the weight accounting of metal dust is 89%~92%, the weight accounting of binding agent
For 8%~11%, incorporation time is 40~60min, and mixing temperature is 325~350 DEG C, and temperature during granulation is 180~200
℃。
It is further that in step e, each subassembly blank has been welded to connect by pistol type ultrasonic welding machine
Come.
It is further that in step e, last layer sinter coating is applied at each subassembly blank solder bond.
It is further that sinter coating is to be formed with parts to be processed identical metal dust and hydrosol modulation, and gold
The granularity for belonging to powder is less than 10 microns.
It is further that sinter coating is starchiness.
It is further that in step f, the temperature of sintering furnace is 1300-1400 DEG C, vacuum 0.03-0.05Pa, is burnt
The knot time is 2-3h.
The beneficial effects of the invention are as follows：The present invention by parts to be processed by being divided into multiple subassemblies, by each sub-portion
Part is processed into subassembly blank by injection molding, by each subassembly blank by being welded to connect, so as to constituent part
Blank, part blank be put into sintering furnace carry out it is degreasing sintered, sintering completion obtain finished product, realize by powder injection-molded
Technology produces hollow body part, and obtained finished product will not be cracked and deformed, and global density is uniform, and consistency can be higher than
99.6%, processing step is uncomplicated, and operation is fairly simple, and production efficiency is high, and the product quality of production is good, qualification rate is high, energy
Produce in enormous quantities.
Embodiment
The processing method of hollow body metal parts of the present invention, comprises the following steps：
A, according to the drawing of parts to be processed, part is divided into multiple subassemblies, and draw the figure of each subassembly respectively
Paper, if parts to be processed is shaped as axisymmetric shape, such as circular or ellipse, centered on the symmetry axis of parts to be processed
Axle, it is divided into two subassemblies of identical；
B, according to the drawing of each subassembly, make respectively corresponding to mould；
C, metal dust and binding agent are well mixed, are then prepared into feed pellet；The weight of wherein metal dust accounts for
Than for 89%~92%, the weight accounting of binding agent is 8%~11%, incorporation time is 40~60min, mixing temperature 325
~350 DEG C, temperature during granulation is 180~200 DEG C；
D, feed pellet is expelled in each mould using injection moulding machine, subassembly blank corresponding to formation；
E, by each subassembly blank by being welded to connect, so as to constituent part blank；
F, part blank is put into sintering furnace and carries out degreasing sintered, slough bonding agent, in step f, the temperature of sintering furnace
Spend for 1300-1400 DEG C, vacuum 0.03-0.05Pa, sintering time 2-3h, sintering completion obtains finished product.
The present invention is processed into by the way that parts to be processed is divided into multiple subassemblies by each subassembly by injection molding
Subassembly blank, by each subassembly blank by being welded to connect, so as to constituent part blank, part blank is put into sintering
Carried out in stove it is degreasing sintered, sintering completion obtain finished product, realize by powder injection-molded technology produce hollow body part, obtain
To finished product will not crack and deform, global density is uniform, consistency can be higher than 99.6%, processing step is uncomplicated, behaviour
Make comparisons simple, production efficiency is high, and the product quality of production is good, qualification rate is high, can produce in enormous quantities.
Specifically, in order to ensure the quality of finished product, in step e, each subassembly blank is passed through into pistol type ultrasonic wave
Bonding machine is welded to connect, but also is applying last layer sinter coating at each subassembly blank solder bond, sintering
Coating is to be formed with parts to be processed identical metal dust and hydrosol modulation, and the granularity of metal dust is less than 10 microns,
Sinter coating is starchiness, and the granularity of metal dust is less than 10 microns of convenient junctions for incorporating welding, improves the quality of welding.
Embodiment 1
Prepare diameter 30mm hollow ball, inflated diameter 20mm.
A, according to the drawing of hollow ball, the axle centered on symmetry axis, hollow ball is divided into 2 subassemblies (hemisphere), and divide
Not Hui Zhi subassembly drawing；
B, according to the drawing of subassembly, make respectively corresponding to mould；
C, the powder of stainless steel of weight accounting 92% and the binding agent of weight accounting 8% is taken to be mixed at a temperature of 340 DEG C
Uniformly, incorporation time 55min, and it is prepared into feed pellet at a temperature of 200 DEG C；
D, feed pellet is expelled in each mould using injection moulding machine, subassembly blank corresponding to formation；
E, each subassembly blank is welded to connect by pistol type ultrasonic welding machine, but also in each height
Last layer sinter coating is applied at part blank solder bond, sinter coating is and parts to be processed identical metal dust and water
Colloidal sol modulation forms, and the granularity of metal dust is less than 10 microns, and sinter coating is starchiness, so as to constituent part blank；
F, part blank is put into freezing of a furnace and is heated to 250~280 DEG C to slough binding agent, then sintering furnace continues to heat
To 1350 DEG C of ground, sintering furnace vacuum is 0.05Pa, sintering time 2h, and the finished product consistency for coming out of the stove to obtain after the completion of sintering reaches
99.7%, finished product does not have crackle and deformation.
Embodiment 2
Prepare longest diameter 40mm, most short diameter 20mm spheroid.
A, according to the drawing of hollow ball, the axle centered on symmetry axis, hollow ball is divided into 2 subassemblies (semielliptical), and
The drawing of subassembly is drawn respectively；
B, according to the drawing of each subassembly, make respectively corresponding to mould；
C, the powder of stainless steel of weight accounting 89% and the binding agent of weight accounting 12% is taken to be mixed at a temperature of 350 DEG C
Uniformly, incorporation time 58min, and it is prepared into feed pellet at a temperature of 190 DEG C；
D, feed pellet is expelled in each mould using injection moulding machine, subassembly blank corresponding to formation；
E, each subassembly blank is welded to connect by pistol type ultrasonic welding machine, but also in each height
Last layer sinter coating is applied at part blank solder bond, sinter coating is and parts to be processed identical metal dust and water
Colloidal sol modulation forms, and the granularity of metal dust is less than 10 microns, and sinter coating is starchiness, so as to constituent part blank；
F, part blank is put into freezing of a furnace and is heated to 250~280 DEG C to slough binding agent, then sintering furnace continues to heat
To 1400 DEG C of ground, sintering furnace vacuum is 0.04Pa, sintering time 3h, and the finished product consistency for coming out of the stove to obtain after the completion of sintering reaches
99.8%, finished product does not have crackle and deformation.
Claims (9)
1. the processing method of hollow body metal parts, it is characterised in that：Comprise the following steps：
A, according to the drawing of parts to be processed, part is divided into multiple subassemblies, and draw the drawing of each subassembly respectively；
B, according to the drawing of each subassembly, make respectively corresponding to mould；
C, metal dust and binding agent are well mixed, are then prepared into feed pellet；
D, feed pellet is expelled in each mould using injection moulding machine, subassembly blank corresponding to formation；
E, by each subassembly blank by being welded to connect, so as to constituent part blank；
F, part blank is put into sintering furnace carry out it is degreasing sintered, sintering completion obtain finished product.
2. the processing method of hollow body metal parts as claimed in claim 1, it is characterised in that：Parts to be processed is shaped as
Axisymmetric shape, the axle centered on the symmetry axis of parts to be processed, it is divided into two subassemblies of identical.
3. the processing method of hollow body metal parts as claimed in claim 2, it is characterised in that：Parts to be processed is shaped as
Circular or ellipse.
4. the processing method of hollow body metal parts as claimed in claim 1, it is characterised in that：In step c, metal dust
Weight accounting be 89%~92%, the weight accounting of binding agent is 8%~11%, and incorporation time be 40~60min, and mixing is warm
Spend for 325~350 DEG C, temperature during granulation is 180~200 DEG C.
5. the processing method of hollow body metal parts as claimed in claim 1, it is characterised in that：In step e, by each height
Part blank is welded to connect by pistol type ultrasonic welding machine.
6. the processing method of the hollow body metal parts as described in claim 1 to 5 any one, it is characterised in that：In step e
In, apply last layer sinter coating at each subassembly blank solder bond.
7. the processing method of hollow body metal parts as claimed in claim 6, it is characterised in that：Sinter coating be with it is to be processed
Part identical metal dust forms with hydrosol modulation, and the granularity of metal dust is less than 10 microns.
8. the processing method of hollow body metal parts as claimed in claim 7, it is characterised in that：Sinter coating is starchiness.
9. the processing method of hollow body metal parts as claimed in claim 1, it is characterised in that：In step f, sintering furnace
Temperature is 1300-1400 DEG C, vacuum 0.03-0.05Pa, sintering time 2-3h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710750058.1A CN107511485A (en) | 2017-08-28 | 2017-08-28 | The processing method of hollow body metal parts |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710750058.1A CN107511485A (en) | 2017-08-28 | 2017-08-28 | The processing method of hollow body metal parts |
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Family
ID=60724370
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| CN201710750058.1A Pending CN107511485A (en) | 2017-08-28 | 2017-08-28 | The processing method of hollow body metal parts |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108687348A (en) * | 2018-05-25 | 2018-10-23 | 合肥汇智新材料科技有限公司 | A kind of Novel valve core production technology |
| CN109226773A (en) * | 2018-08-20 | 2019-01-18 | 北京科技大学 | Hollow bolted node sphere of titanium alloy and preparation method thereof |
| CN112371985A (en) * | 2020-10-27 | 2021-02-19 | 上海工艺美术职业学院 | Metal processing technology |
| CN113857479A (en) * | 2021-09-15 | 2021-12-31 | 浙江大学 | Preparation method of titanium metal component based on powder injection molding |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108687348A (en) * | 2018-05-25 | 2018-10-23 | 合肥汇智新材料科技有限公司 | A kind of Novel valve core production technology |
| CN109226773A (en) * | 2018-08-20 | 2019-01-18 | 北京科技大学 | Hollow bolted node sphere of titanium alloy and preparation method thereof |
| CN112371985A (en) * | 2020-10-27 | 2021-02-19 | 上海工艺美术职业学院 | Metal processing technology |
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| CN113857479A (en) * | 2021-09-15 | 2021-12-31 | 浙江大学 | Preparation method of titanium metal component based on powder injection molding |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20180525 Address after: 213000 Yue Lake Road, Jintan District, Changzhou, Jiangsu Province, No. 6 Applicant after: Jiangsu science and Technology Co., Ltd. Address before: 617000 Airport Road, East District, Panzhihua, Sichuan Province, No. 10 Applicant before: Panzhihua University |
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Application publication date: 20171226 |