CN116174720A - Powder metallurgy parking limiting block and production method thereof - Google Patents
Powder metallurgy parking limiting block and production method thereof Download PDFInfo
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- CN116174720A CN116174720A CN202211392975.4A CN202211392975A CN116174720A CN 116174720 A CN116174720 A CN 116174720A CN 202211392975 A CN202211392975 A CN 202211392975A CN 116174720 A CN116174720 A CN 116174720A
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- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000010791 quenching Methods 0.000 claims abstract description 33
- 230000000171 quenching effect Effects 0.000 claims abstract description 33
- 238000005245 sintering Methods 0.000 claims abstract description 33
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 238000003825 pressing Methods 0.000 claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 10
- 239000010439 graphite Substances 0.000 claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000004615 ingredient Substances 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 18
- 238000005496 tempering Methods 0.000 claims description 17
- 238000003801 milling Methods 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 239000000314 lubricant Substances 0.000 description 20
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 230000003449 preventive effect Effects 0.000 description 4
- 239000012744 reinforcing agent Substances 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical group [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000007822 coupling agent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000013905 glycine and its sodium salt Nutrition 0.000 description 2
- 239000004247 glycine and its sodium salt Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- -1 polyethylene isobutyl ether Polymers 0.000 description 2
- 229940029258 sodium glycinate Drugs 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical group CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- 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
- B22F3/02—Compacting only
-
- 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
-
- 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
- B22F3/24—After-treatment of workpieces or articles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
-
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention provides a production method of a powder metallurgy parking limiting block, which comprises the following steps: batching, pressing, sintering, drilling and quenching; the ingredients are evenly mixed with iron powder, copper powder and graphite to prepare a mixture; after the mixture is pressed and molded, a sintered part is prepared by sintering; and drilling and quenching the sintered part to obtain the powder metallurgy parking limiting block. The invention also provides a powder metallurgy parking limiting block, which comprises the following components in percentage by mass: 0.2-1.0% of C, 1.0-5.0% of Cu, and the balanceThe balance of Fe and unavoidable impurities, the density is more than 6.8g/cm 3 . The invention effectively solves the problems of difficult processing and manufacturing, low production efficiency and high comprehensive production cost of the parking limiting block with a specific structure in the prior art due to the complex structure, high requirements on the inner surface finish and angle and the like.
Description
Technical Field
The invention relates to the field of parking limiting blocks, in particular to a powder metallurgy parking limiting block and a production method thereof.
Background
With the continuous development of technology, the requirements on the parking system of the motor vehicle are also increasing. The traditional parking device is usually matched with mechanisms such as a hand brake pull rod, a parking limiting block and the like, and the parking limiting of the motor vehicle is realized through matching.
The powder metallurgy part has good physical and mechanical properties, higher design flexibility and lower production cost, so the powder metallurgy part is widely applied in the field of motor vehicles, and has application in key parts of motor vehicles such as motor vehicle chassis, brake system, fuel pump, oil pump, engine, transmission, brake booster vacuum pump and the like. Particularly, in recent years, with the rapid development of the motor vehicle industry, more and more parts are produced by adopting a powder metallurgy process in design for the production cost of the compressor motor vehicle while ensuring the performance.
In the prior art, the existing production process of the parking limiting block product is usually carried out in a mode of milling and drilling by a machining center after precision casting. But the structure of current parking stopper is comparatively complicated, and needs to slide with parking cooperation piece relatively to realize should parking spacing effect. The inner surface of the parking limiting block cannot completely meet the process requirements in finish and angle by processing through the existing process.
At present, the existing production process of the parking limiting block is difficult to process and manufacture due to the fact that the structure is complex, the inner surface smoothness and the angle requirements are high, the production efficiency is low, and the comprehensive production cost is high. Meanwhile, the parking limiting block manufactured through the existing parking limiting block production process is low in precision, low in yield, incapable of being effectively lifted, poor in product reliability, serious in abrasion in the actual use process, potential safety hazards exist, and the safety use requirements cannot be completely met.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the powder metallurgy parking limiting block and the production method thereof, which can effectively improve the production efficiency on the basis of ensuring the surface smoothness and the angle requirement of the inner surface of the parking limiting block; the parking stopper precision that makes is high, effectively promotes the yields, and product performance is stable, effectively eliminates the potential safety hazard, can satisfy the safe operation requirement.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a production method of a powder metallurgy parking limiting block comprises the following steps: batching, pressing, sintering, drilling and quenching;
the ingredients are evenly mixed with iron powder, copper powder and graphite to prepare a mixture;
after the mixture is pressed and molded, a sintered part is prepared by sintering; drilling and quenching the sintered part to obtain a powder metallurgy parking limiting block;
the powder metallurgy parking limiting block comprises the following components in percentage by mass: c0.2-1.0%, cu 1.0-5.0%, and Fe and unavoidable impurities as the rest.
Further, the pressing is carried out by adopting a last powder forming die carrier and a next powder forming die carrier to press and form the mixture, and a blank is obtained; the density of the blank is 6.85-6.95g/cm 3 。
Further, the pressing pressure is 30-32T, the demoulding pressure is 15-17T, and the powder adding amount of the mixture is 2-2.2 times of the die volume.
Further, the sintering temperature is 1110-1130 ℃ and the sintering time is 40-50 minutes.
Further, the drilling is carried out on the sintered part by adopting a machining center;
the drilling adopts an alloy drill bit and a milling cutter;
and the rotating speed of a main shaft of the drilling and processing center is 5000-6000rpm.
Further, quenching and tempering are sequentially carried out on the sintered part after drilling, and then vibration grinding and oil immersion are carried out to obtain the powder metallurgy parking limiting block;
the quenching temperature is 810-830 ℃, and the tempering temperature is 180-190 ℃;
the quenching and tempering treatment time is 1-1.2h;
the vibration grinding is carried out, the vibration grinding power is 3.5-5KW, and the vibration grinding time is 60-70min.
The powder metallurgy parking limiting block is manufactured by adopting the production method;
the powder metallurgy parking stopper includes: a semicircular inner hole and a positioning wall;
the semicircle hole is hollow semicircle arc, including: a first bore region and a second bore region;
the first inner hole area is in transitional connection with the second inner hole area through steps; the steps are smooth step inclined planes;
the positioning wall is arranged on the opposite side of the semicircular inner hole accommodating space and is integrally formed with the outer wall of the semicircular inner hole;
the positioning wall is provided with a positioning hole for fixing the powder metallurgy parking limiting block at a preset position.
Further, the outer diameter of the first inner bore region is equal to the outer diameter of the second inner bore region;
the inner diameter of the first inner bore region is greater than the inner diameter of the second inner bore region.
Further, the ratio of the inner diameters of the first inner hole area and the second inner hole area is 1.05-1.1:1.
Further, the density of the powder metallurgy parking limiting block is more than 6.8g/cm 3 The roughness of the first inner hole area 101, the second inner hole area 102 and the step inclined plane 103 is not more than Ra0.8; the roughness of the positioning hole is not more than Ra1.6.
Compared with the prior art, the invention has the beneficial effects that:
(1) The production method of the powder metallurgy parking limiting block effectively solves the problems that when the powder metallurgy parking limiting block is used for producing the parking limiting block with the specific structure in the prior art, the processing and the manufacturing of the parking limiting block are difficult due to the fact that the structure is complex, the inner surface smoothness and the angle requirements are high, the production efficiency is low, and the comprehensive production cost is high.
(2) According to the production method of the powder metallurgy parking limiting block, through matching of specific raw materials and combination of a specific production process, smooth transition of the first inner hole area, the second inner hole area and the step inclined plane of the parking limiting block can be achieved, on the basis that the surface roughness of the step inclined plane of the semicircular inner hole in the parking limiting block is not more than Ra0.8 and the angle tolerance is controlled to be +/-1 degree, production efficiency is effectively improved, and compared with the prior art, the production efficiency is effectively improved by more than 50% in number of qualified products produced in unit time.
(3) According to the production method of the powder metallurgy parking limiting block, the precision of the manufactured parking limiting block is high, the tolerance of a hole can be controlled below 0.1mm, the angle tolerance is controlled below +/-1 DEG, the roundness is controlled below 0.01mm, and the production yield can be effectively improved to 99.3%.
(4) According to the production method of the powder metallurgy parking limiting block, the prepared parking limiting block is stable in performance and controllable in quality; the powder metallurgy parking limiting block is stable in abrasion loss in the actual use process, effectively eliminates potential safety hazards and can meet the safety use requirement.
(5) The production method of the powder metallurgy parking limiting block is simple and efficient, and the parking limiting block meeting the requirements of precision and angle can be manufactured through compression molding, sintering, drilling in a machining center and quenching, so that the production process is fast and efficient, and the industrial mass production requirements can be met.
Drawings
FIG. 1 is a perspective view of a powder metallurgy park stopper of the present invention;
FIG. 2 is a top view of a powder metallurgy park brake block of the present invention;
FIG. 3 is a cross-sectional view taken at A-A in FIG. 2;
FIG. 4 is a cross-sectional view taken at B-B in FIG. 2;
in the figure, 10-semicircle inner holes, 20-positioning walls, 101-first inner hole areas, 102-second inner hole areas, 103-step inclined planes, 201-first positioning holes and 202-second positioning holes.
Detailed Description
Specific embodiments of the present invention will now be described in order to provide a clearer understanding of the technical features, objects and effects of the present invention.
Example 1
As shown in fig. 1-4, a powder metallurgy parking stopper includes: a semi-circular inner bore 10, a positioning wall 20;
the semi-circular inner hole 10 is hollow semi-circular arc, and a containing space is formed in the arc area of the semi-circular arc so as to slide relatively with the parking shaft and the parking matching piece, thereby realizing parking limit.
The semi-circular inner hole 10 comprises: a first bore region 101 and a second bore region 102; the first inner hole area 101 is in transitional connection with the second inner hole area 102 through steps; the step is a smooth step bevel 103.
Wherein the outer diameter of the first bore region 101 is equal to the outer diameter of the second bore region 102.
The inner diameter of the first bore region 101 is larger than the inner diameter of the second bore region 102.
The ratio of the inner diameters of the first inner bore region 101 and the second inner bore region 102 is 1.05-1.1:1.
The roughness of the first inner hole area 101, the second inner hole area 102 and the step inclined surface 103 is not more than Ra0.8.
The connection part of the first inner hole area 101 and the step inclined plane 103 is provided with a round angle tangent to ensure smooth transition between the first inner hole area 101 and the step inclined plane 103.
The connection part of the second inner hole area 102 and the step inclined plane 103 is provided with a round angle tangent to ensure smooth transition between the second inner hole area 102 and the step inclined plane 103.
The positioning wall 20 is disposed on the opposite side of the accommodating space of the semi-circular inner hole 10, and is integrally formed with the outer wall of the semi-circular inner hole 10, and is used for fixing the powder metallurgy parking limiting block at a predetermined position.
The positioning wall 20 is provided with two positioning holes: a first positioning hole 201 and a second positioning hole 202.
The two positioning holes are sequentially distributed along the direction from the first inner hole area 101 to the second inner hole area 102.
The positioning holes are positioning step holes.
The roughness of the positioning step hole is not more than Ra1.6.
Example 2
A production method of a powder metallurgy parking limiting block comprises the following specific steps:
1. proportioning materials
And (3) putting the iron powder, the copper powder, the graphite and the lubricant into a mixer, and uniformly mixing to obtain the mixture.
The lubricant is a conventional lubricant in the field of powder metallurgy, the lubricant adopted in the embodiment is stearic acid, and the addition amount of the lubricant is 0.5wt% of the total mass of the mixture.
2. Pressing
And (3) adopting a last powder forming die carrier and a next powder forming die carrier to press and form the mixture, and obtaining the blank.
The density of the blank was 6.85g/cm 3 。
The pressing forming is carried out, the pressing pressure is 30T, the demoulding pressure is 15T, and the powder adding amount of the mixture is 2 times of the volume of the die.
3. Sintering
Sintering the blank by adopting a mesh belt type sintering furnace, wherein the sintering temperature is 1110 ℃, and the sintering time is 40 minutes; after the sintering is completed, a sintered article is produced.
During sintering, the blank is placed on a flat graphite plate and two layers are placed.
4. Drilling holes
And placing the sintered part in a machining center, and drilling a positioning hole by adopting an alloy drill bit and a milling cutter.
And the spindle rotating speed of the drilling and processing center is 5000rpm.
5. Quenching
And (3) placing the drilled sintered part in a mesh belt quenching furnace, sequentially carrying out quenching and tempering treatment, and then carrying out vibration grinding, appearance full inspection and rust preventive oil immersion to obtain the powder metallurgy parking limiting block in the embodiment 1, wherein the production yield is 99.3%.
The quenching temperature is 810 ℃, and the tempering temperature is 180 ℃.
The quenching and tempering treatment time is 1h.
And the vibration grinding is carried out, the vibration grinding power is 3.5KW, and the vibration grinding time is 60min.
The powder metallurgy parking limiting block comprises the following components in percentage by mass: 0.2% of C, 1.0% of Cu, and the balance of Fe and unavoidable impurities.
The density of the powder metallurgy parking limiting block is 6.89g/cm 3 The first bore region 101 has an inner diameter of φ 18.41 and the second bore region 102 has an inner diameter of φ 19.91; the roughness of the first inner hole area 101, the second inner hole area 102 and the step inclined surface 103 is Ra0.8, and the roughness of the first positioning hole 201 and the second positioning hole 202 is Ra1.6.
Example 3
A production method of a powder metallurgy parking limiting block comprises the following specific steps:
1. proportioning materials
And (3) putting the iron powder, the copper powder, the graphite and the lubricant into a mixer, and uniformly mixing to obtain the mixture.
The lubricant is a conventional lubricant in the field of powder metallurgy, the lubricant adopted in the embodiment is zinc stearate, and the addition amount of the lubricant is 0.7wt% of the total mass of the mixture.
2. Pressing
And (3) adopting a last powder forming die carrier and a next powder forming die carrier to press and form the mixture, and obtaining the blank.
The density of the blank is 6.90g/cm 3 。
The pressing forming is carried out, the pressing pressure is 31T, the demoulding pressure is 16T, and the powder adding amount of the mixture is 2.1 times of the volume of the die.
3. Sintering
Sintering the blank by adopting a mesh belt type sintering furnace, wherein the sintering temperature is 1120 ℃, and the sintering time is 45 minutes; after the sintering is completed, a sintered article is produced.
During sintering, the blank is placed on a flat graphite plate and two layers are placed.
4. Drilling holes
And placing the sintered part in a machining center, and drilling a positioning hole by adopting an alloy drill bit and a milling cutter.
And the spindle rotating speed of the drilling and processing center is 5500rpm.
5. Quenching
And (3) placing the drilled sintered part in a mesh belt quenching furnace, sequentially carrying out quenching and tempering treatment, and then carrying out vibration grinding, appearance full inspection and rust preventive oil immersion to obtain the powder metallurgy parking limiting block in the embodiment 1, wherein the production yield is 99.2%.
The quenching temperature is 820 ℃, and the tempering temperature is 185 ℃.
The time of quenching and tempering treatment is 1.1h.
And the vibration grinding is carried out, the vibration grinding power is 4KW, and the vibration grinding time is 65min.
The powder metallurgy parking limiting block comprises the following components in percentage by mass: 0.6% of C, 3.0% of Cu, and the balance of Fe and unavoidable impurities.
The density of the powder metallurgy parking limiting block is 6.91g/cm 3 The inner diameter of the first inner hole area 101 is phi 18.50, the inner diameter of the second inner hole area 102 is phi 19.93, the roughness of the first inner hole area 101, the second inner hole area 102 and the step inclined plane 103 is Ra0.8, and the roughness of the first positioning hole 201 and the second positioning hole 202 is Ra1.6.
Example 4
A production method of a powder metallurgy parking limiting block comprises the following specific steps:
1. proportioning materials
And (3) putting the iron powder, the copper powder, the graphite and the lubricant into a mixer, and uniformly mixing to obtain the mixture.
The lubricant is a conventional lubricant in the field of powder metallurgy, the lubricant adopted in the embodiment is stearic acid amide, and the addition amount of the lubricant is 0.9wt% of the total mass of the mixture.
2. Pressing
And (3) adopting a last powder forming die carrier and a next powder forming die carrier to press and form the mixture, and obtaining the blank.
The density of the blank was 6.95g/cm 3 。
The pressing forming is carried out, the pressing pressure is 32T, the demoulding pressure is 17T, and the powder adding amount of the mixture is 2.2 times of the volume of the die.
3. Sintering
Sintering the blank by adopting a mesh belt type sintering furnace, wherein the sintering temperature is 1130 ℃ and the sintering time is 50 minutes; after the sintering is completed, a sintered article is produced.
During sintering, the blank is placed on a flat graphite plate and two layers are placed.
4. Drilling holes
And placing the sintered part in a machining center, and drilling a positioning hole by adopting an alloy drill bit and a milling cutter.
And the rotating speed of the main shaft of the drilling and processing center is 6000rpm.
5. Quenching
And (3) placing the drilled sintered part in a mesh belt quenching furnace, sequentially carrying out quenching and tempering treatment, and then carrying out vibration grinding, appearance full inspection and rust preventive oil immersion to obtain the powder metallurgy parking limiting block in the embodiment 1, wherein the production yield is 99.0%.
The quenching temperature is 830 ℃, and the tempering temperature is 190 ℃.
The time of quenching and tempering treatment is 1.2h.
And the vibration grinding is carried out, the vibration grinding power is 5KW, and the vibration grinding time is 70min.
The powder metallurgy parking limiting block comprises the following components in percentage by mass: c1.0%, cu 5.0%, and the balance of Fe and unavoidable impurities.
The density of the powder metallurgy parking limiting block is 6.98g/cm 3 The inner diameter of the first inner hole area 101 is phi 18.48, the inner diameter of the second inner hole area 102 is phi 19.97, the roughness of the first inner hole area 101, the second inner hole area 102 and the step inclined plane 103 is Ra0.8, and the roughness of the first positioning hole 201 and the second positioning hole 202 is Ra1.6.
Example 5
A production method of a powder metallurgy parking limiting block comprises the following specific steps:
1. proportioning materials
And (3) putting the iron powder, the copper powder, the graphite, the lubricant and the reinforcing agent into a mixer, and uniformly mixing to obtain the mixture.
The lubricant is a conventional lubricant in the field of powder metallurgy, the lubricant adopted in the embodiment is stearic acid, and the addition amount of the lubricant is 0.5wt% of the total mass of the mixture.
The production method of the reinforcing agent comprises the steps of putting carbon fiber, polyethylene isobutyl ether, N-hydroxymethyl sodium glycinate, zinc stearate and a coupling agent KH-550 into a ball mill, controlling the ball-material ratio to be 12:1, and performing ball milling at 650rpm for 30min to obtain a ball-milled product; placing the ball-milled material in nitrogen atmosphere, adopting the following steps at 40 DEG C 60 Carrying out irradiation treatment on the ball-milled material by a Co radiation source, and controlling the irradiation metering to be 100KGy; after the irradiation treatment is finished, pressurizing to 12MPa at a pressurizing rate of 3MPa/min, and maintaining the pressure for 20min; then standing for 1h at 80 ℃ under the vacuum degree of 0.08MPa to prepare the reinforcing agent.
Wherein the weight ratio of the carbon fiber to the polyethylene isobutyl ether to the N-hydroxymethyl sodium glycinate to the zinc stearate to the coupling agent KH-550 is 30:10:2:12:0.2.
The length of the carbon fiber is 8 μm.
The addition amount of the reinforcing agent is 3wt% of the total mass of the mixture.
2. Pressing
And (3) adopting a last powder forming die carrier and a next powder forming die carrier to press and form the mixture, and obtaining the blank.
The density of the blank was 6.85g/cm 3 。
The pressing forming is carried out, the pressing pressure is 30T, the demoulding pressure is 15T, and the powder adding amount of the mixture is 2 times of the volume of the die.
3. Sintering
Heating the blank to 800 ℃ under the pressure condition of 20MPa by adopting high-energy pulse current, and preserving heat for 20min; then heating to 950 ℃, and preserving heat for 10min; then heating to 1120 ℃ at a heating rate of 20 ℃/min, and preserving heat for 15min to obtain the sintered part.
4. Drilling holes
And placing the sintered part in a machining center, and drilling a positioning hole by adopting an alloy drill bit and a milling cutter.
And the rotating speed of the main shaft of the drilling and processing center is 6000rpm.
5. Quenching
And (3) placing the drilled sintered part in a mesh belt quenching furnace, sequentially carrying out quenching and tempering treatment, and then carrying out vibration grinding, appearance full inspection and rust preventive oil immersion to obtain the powder metallurgy parking limiting block in the embodiment 1, wherein the production yield is up to 99.5%.
The quenching temperature is 820 ℃, and the tempering temperature is 180 ℃.
The quenching and tempering treatment time is 1h.
And the vibration grinding is carried out, the vibration grinding power is 5KW, and the vibration grinding time is 60min.
The powder metallurgy parking limiting block comprises the following components in percentage by mass: c1.0%, cu 3.0%, and the balance being Fe and unavoidable impurities.
The density of the powder metallurgy parking limiting block is 6.86g/cm 3 The inner diameter of the first inner hole area 101 is phi 18.40, the inner diameter of the second inner hole area 102 is phi 19.90, the roughness of the first inner hole area 101, the second inner hole area 102 and the step inclined plane 103 is Ra0.4, and the roughness of the first positioning hole 201 and the second positioning hole 202 is Ra1.6.
The percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The production method of the powder metallurgy parking limiting block is characterized by comprising the following steps of: batching, pressing, sintering, drilling and quenching;
the ingredients are evenly mixed with iron powder, copper powder and graphite to prepare a mixture;
after the mixture is pressed and molded, a sintered part is prepared by sintering; drilling and quenching the sintered part to obtain a powder metallurgy parking limiting block;
the powder metallurgy parking limiting block comprises the following components in percentage by mass: c0.2-1.0%, cu 1.0-5.0%, and Fe and unavoidable impurities as the rest.
2. The method for producing the powder metallurgy parking limiting block according to claim 1, wherein the pressing is performed by adopting a last powder forming die carrier and a next powder forming die carrier to press and form the mixture, and a blank is obtained; the density of the blank is 6.85-6.95g/cm 3 。
3. The method for producing the powder metallurgy parking limiting block according to claim 1, wherein the pressing pressure is 30-32T, the demoulding pressure is 15-17T, and the powder adding amount of the mixture is 2-2.2 times of the volume of the die.
4. The method for producing a powder metallurgy parking stopper according to claim 1, wherein the sintering is performed at a sintering temperature of 1110-1130 ℃ for 40-50 minutes.
5. The method for producing a powder metallurgy parking limiting block according to claim 1, wherein the drilling is performed by drilling a sintered piece by a machining center;
the drilling adopts an alloy drill bit and a milling cutter;
and the rotating speed of a main shaft of the drilling and processing center is 5000-6000rpm.
6. The method for producing the powder metallurgy parking limiting block according to claim 1, wherein the quenching is performed sequentially on a sintered piece after drilling, and then the powder metallurgy parking limiting block is produced through vibration grinding and oil immersion;
the quenching temperature is 810-830 ℃, and the tempering temperature is 180-190 ℃;
the quenching and tempering treatment time is 1-1.2h;
the vibration grinding is carried out, the vibration grinding power is 3.5-5KW, and the vibration grinding time is 60-70min.
7. A powder metallurgy parking stopper, characterized in that it is manufactured by the manufacturing method according to any one of claims 1 to 6;
the powder metallurgy parking stopper includes: a semi-circular inner hole (10) and a positioning wall (20);
the semi-circular inner hole (10) is hollow semi-arc, and comprises: a first bore region (101) and a second bore region (102);
the first inner hole area (101) is in transitional connection with the second inner hole area (102) through steps; the steps are smooth step inclined planes (103);
the positioning wall (20) is arranged on the opposite side of the accommodating space of the semi-circular inner hole (10) and is integrally formed with the outer wall of the semi-circular inner hole (10);
the positioning wall (20) is provided with a positioning hole for fixing the powder metallurgy parking limiting block at a preset position.
8. The powder metallurgy park stopper according to claim 7, wherein the outer diameter of the first inner bore region (101) is equal to the outer diameter of the second inner bore region (102);
the inner diameter of the first inner bore region (101) is larger than the inner diameter of the second inner bore region (102).
9. The powder metallurgy park stopper according to claim 7, wherein the ratio of the inner diameters of the first inner bore region (101) and the second inner bore region (102) is 1.05-1.1:1.
10. Powder metallurgy park stopper according to any of claims 7-9, characterized in that it has a density > 6.8g/cm 3 The roughness of the first inner hole area (101), the second inner hole area (102) and the step inclined surface (103) is not more than Ra0.8; the roughness of the positioning hole is not more than Ra1.6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211392975.4A CN116174720A (en) | 2022-11-08 | 2022-11-08 | Powder metallurgy parking limiting block and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211392975.4A CN116174720A (en) | 2022-11-08 | 2022-11-08 | Powder metallurgy parking limiting block and production method thereof |
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| CN116174720A true CN116174720A (en) | 2023-05-30 |
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| CN202211392975.4A Pending CN116174720A (en) | 2022-11-08 | 2022-11-08 | Powder metallurgy parking limiting block and production method thereof |
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| CN214146556U (en) * | 2020-11-26 | 2021-09-07 | 江苏新能源汽车研究院有限公司 | Multimode case parking braking mechanism |
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| CN1480667A (en) * | 2002-09-28 | 2004-03-10 | 姜堰市嘉诚粉末制品有限公司 | Method for manufacturing interlock board and stopper |
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