CN113333755A - Preparation method of powder metallurgy face tooth of angle grinder - Google Patents
Preparation method of powder metallurgy face tooth of angle grinder Download PDFInfo
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- CN113333755A CN113333755A CN202110555094.9A CN202110555094A CN113333755A CN 113333755 A CN113333755 A CN 113333755A CN 202110555094 A CN202110555094 A CN 202110555094A CN 113333755 A CN113333755 A CN 113333755A
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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
- B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
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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
- B22F3/02—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
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- 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
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F2003/145—Both compacting and sintering simultaneously by warm compacting, below debindering temperature
-
- 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
- B22F2003/241—Chemical after-treatment on the surface
-
- 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
- B22F2003/248—Thermal after-treatment
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a preparation method of a powder metallurgy face tooth of an angle grinder, which comprises the following steps: analyzing the tooth shape of the face tooth: making various sizes of the face teeth of the angle grinder, analyzing the tooth form of the face teeth of the angle grinder through KISSsoft software, establishing a three-dimensional model of the face teeth, and checking the strength to meet the strength requirement; designing a primary die for the face teeth: and (3) according to the geometric parameters of the three-dimensional model of the face tooth in the step 1), giving a design scheme of the primary die of the face tooth through KISSsoft software. The face tooth is made of metal powder, compared with the traditional spiral bevel gear transmission, the weight of the powder metallurgy face tooth structure is reduced by 40%, and the face tooth does not need to be arranged in a staggered mode in the transmission process, so that certain economic benefit can be brought; on the other hand, the powder metallurgy is used for replacing the traditional gear machine processing and forming, and has the characteristics of high production efficiency, good product consistency, high material utilization rate, small environmental pollution and the like during batch production, and the economic benefit and the social benefit of the product can be further improved.
Description
Technical Field
The invention relates to the technical field of powder metallurgy treatment, in particular to a preparation method of a powder metallurgy face tooth of an angle grinder.
Background
Most of gears used in an angle grinder in the prior art are spiral bevel gears, and face teeth on the spiral bevel gears are usually manufactured by machining, for example, a gear shaping machine and the like due to the structural characteristics, but the production efficiency is low, the material utilization rate is low, and the single product cost is high.
However, in the prior art, the angle grinder face teeth are manufactured by adopting a mold and the like, but the strength of the angle grinder face teeth manufactured by the mold and the like in the prior art is not ideal enough.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects in the prior art, the preparation method of the powder metallurgy face tooth of the angle grinder is provided.
The technical scheme is as follows: in order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a method for preparing powder metallurgy face teeth of an angle grinder comprises the following steps:
1) analyzing the tooth shape of the face tooth: making various sizes of the face teeth of the angle grinder, analyzing the tooth form of the face teeth of the angle grinder through KISSsoft software, establishing a three-dimensional model of the face teeth, and checking the strength to meet the strength requirement;
2) designing a primary die for the face teeth: according to the geometric parameters of the face tooth three-dimensional model in the step 1), giving a design scheme of the face tooth preliminary die through KISSsoft software, and manufacturing an upper punching tooth surface of the face tooth preliminary die according to the three-dimensional model;
3) designing a face tooth powder metallurgy die: according to the production process of the powder metallurgy gear, required metal powder is filled into the face tooth primary die, and a powder metallurgy green compact is pressed on a forming machine;
4) warm-pressing forming technology treatment: processing the powder metallurgy green compact obtained in the step 3) by a warm compaction forming technology; in the process, the work hardening rate of the iron-based powder is low, and the plastic deformation capacity is enhanced, so that the plastic deformation of the iron-based powder in the forming and pressing process is facilitated, the density uniformity of the green body is improved after the warm pressing technology is adopted, and the porosity of the green body can reach more than 94%.
5) Sintering heat treatment process: sintering the powder metallurgy green compact obtained in the step 4) through a sintering heat treatment process; obtaining a powder metallurgy face tooth with errors; in the process, the internal structure of the product is changed, the martensite structure in the structure is rapidly increased, and the strength and the hardness of the product are obviously improved.
6) The principle of backward pushing: comparing the size of the powder metallurgy face tooth with the error in the step 5) with each size of the face tooth formulated in the step 1), and calculating the change rate of the powder metallurgy face tooth after warm-pressing forming technology treatment and sintering heat treatment process according to a back-off principle, thereby determining the rebound rate of the die, determining the correct size of the primary die of the face tooth, and defining the correct size as the final face tooth powder metallurgy die;
7) preparing powder metallurgy face teeth of an angle grinder: manufacturing a face tooth powder metallurgy die according to the size of the final face tooth powder metallurgy die determined in the step 6), filling required metal powder into the face tooth powder metallurgy die, and finally obtaining the angle mill powder metallurgy face tooth meeting the size requirement according to the sequence of the steps 3), 4) and 5).
Further, in the warm-pressing forming technology treatment of the step 4), the alloy powder green body is subjected to forming pressing at a temperature of 130-150 ℃.
Further, in the sintering thermal process treatment in the step 5), the formed and pressed powder metallurgy green body is sintered at the temperature range of 1120 ℃, the heat treatment temperature is 890 ℃, the temperature is kept for 2 hours under the condition that the carbon potential is 0.6, and then the green body is carburized at 180 ℃ for 2 hours to improve the strength.
Further, the female die in the face tooth powder metallurgy die finally obtained in the step 7) is made of 40CrNiMo, the upper punch and the lower punch are made of DRM2, and the core rod is made of SKH 9.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1) according to the invention, powder metallurgy is adopted to prepare the angle grinder face tooth, and a low-temperature forming technology and a sintering heat treatment technology are adopted in the preparation process, so that the actually prepared powder metallurgy face tooth has an error with the size of the required powder metallurgy face tooth;
2) the face tooth is made of metal powder, compared with the traditional spiral bevel gear transmission, the weight of the powder metallurgy face tooth structure is reduced by 40%, the vibration is small, the face tooth does not need to be placed and staggered in the transmission process, and certain economic benefit can be brought; on the other hand, the powder metallurgy is used for replacing the traditional gear machine processing and forming, and has the characteristics of high production efficiency, good product consistency, high material utilization rate, small environmental pollution and the like during batch production, so that the economic benefit and the social benefit of the product can be further improved;
3) the warm-pressing forming technology adopted by the powder metallurgy face tooth can improve the density of the blank, effectively improve the strength of the green blank and is beneficial to improving the mechanical property of the product; the change process of pores is accelerated by sintering and hardening in the adopted sintering heat treatment process technology, the internal microstructure of the product is changed, the hardness of the product can reach HRC38, the martensite is greatly increased, the tensile strength is improved by 26 percent, and the elongation is reduced to 0.6 percent; the performance test of the finished product of the face tooth shows that the density of the face tooth reaches 7.38g/cm, the porosity is 7.17 percent, the torsion value is 580N, the related performance meets the design requirement of the product, and the method has good practicability.
Detailed Description
The present invention will be further illustrated by the following specific examples, which are carried out on the premise of the technical scheme of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
A method for preparing powder metallurgy face teeth of an angle grinder comprises the following steps:
1) analyzing the tooth shape of the face tooth: making various sizes of the face teeth of the angle grinder, analyzing the tooth form of the face teeth of the angle grinder through KISSsoft software, establishing a three-dimensional model of the face teeth, and checking the strength to meet the strength requirement;
2) designing a primary die for the face teeth: according to the geometric parameters of the face tooth three-dimensional model in the step 1), giving a design scheme of the face tooth preliminary die through KISSsoft software, and manufacturing an upper punching tooth surface of the face tooth preliminary die according to the three-dimensional model;
3) designing a face tooth powder metallurgy die: according to the production process of the powder metallurgy gear, required metal powder is filled into the face tooth primary die, and a powder metallurgy green compact is pressed on a forming machine;
4) warm-pressing forming technology treatment: processing the powder metallurgy green compact obtained in the step 3) by a warm compaction forming technology;
5) sintering heat treatment process: sintering the powder metallurgy green compact obtained in the step 4) through a sintering heat treatment process; obtaining a powder metallurgy face tooth with errors;
6) the principle of backward pushing: comparing the size of the powder metallurgy face tooth with the error in the step 5) with each size of the face tooth formulated in the step 1), and calculating the change rate of the powder metallurgy face tooth after warm-pressing forming technology treatment and sintering heat treatment process according to a back-off principle, thereby determining the rebound rate of the die, determining the correct size of the primary die of the face tooth, and defining the correct size as the final face tooth powder metallurgy die;
7) preparing powder metallurgy face teeth of an angle grinder: manufacturing a face tooth powder metallurgy die according to the size of the final face tooth powder metallurgy die determined in the step 6), filling required metal powder into the face tooth powder metallurgy die, and finally obtaining the angle mill powder metallurgy face tooth meeting the size requirement according to the sequence of the steps 3), 4) and 5).
In the warm-pressing forming technology treatment of the step 4), forming and pressing the alloy powder green compact at the temperature of 130-150 ℃; in the process, the work hardening rate of the iron-based powder is low, and the plastic deformation capacity is enhanced, so that the plastic deformation of the iron-based powder in the forming and pressing process is facilitated, the density uniformity of the green body is improved after the warm pressing technology is adopted, and the porosity of the green body can reach more than 94%.
In the sintering heat treatment process of the step 5), the formed and pressed powder metallurgy green compact is sintered at the temperature range of 1120 ℃, the heat treatment temperature is 890 ℃, the carbon potential is 0.6, the heat preservation is carried out for 2 hours, and the carburization is carried out under the condition of tempering at 180 ℃ for 2 hours to improve the strength; in the process, the internal structure of the product is changed, the martensite structure in the structure is rapidly increased, and the strength and the hardness of the product are obviously improved.
The female die in the finally obtained face tooth powder metallurgy die in the step 7) is made of 40CrNiMo, the upper punch and the lower punch are made of DRM2, and the core rod is made of SKH 9.
According to the invention, the angle grinder face tooth is prepared by adopting powder metallurgy, and a low-temperature forming technology and a sintering heat process treatment technology are adopted in the preparation process, so that the actually prepared powder metallurgy face tooth has an error with the size of the required powder metallurgy face tooth.
The face tooth is made of metal powder, compared with the traditional spiral bevel gear transmission, the weight of the powder metallurgy face tooth structure is reduced by 40%, the vibration is small, the face tooth does not need to be placed and staggered in the transmission process, and certain economic benefit can be brought; on the other hand, the powder metallurgy is used for replacing the traditional gear machine processing and forming, and has the characteristics of high production efficiency, good product consistency, high material utilization rate, small environmental pollution and the like during batch production, and the economic benefit and the social benefit of the product can be further improved.
The warm-pressing forming technology adopted by the powder metallurgy face tooth can improve the density of the blank, effectively improve the strength of the green blank and is beneficial to improving the mechanical property of the product; the change process of pores is accelerated by sintering and hardening in the adopted sintering heat treatment process technology, the internal microstructure of the product is changed, the hardness of the product can reach HRC38, the martensite is greatly increased, the tensile strength is improved by 26 percent, and the elongation is reduced to 0.6 percent; the performance test of the finished product of the face tooth shows that the density of the face tooth reaches 7.38g/cm, the porosity is 7.17 percent, the torsion value is 580N, the related performance meets the design requirement of the product, and the method has good practicability.
The detailed description is to be construed as exemplary only and is not intended to limit the invention from practice or the scope of the appended claims, which are intended to include all equivalent variations and modifications within the scope of the invention as claimed.
Claims (5)
1. A method for preparing powder metallurgy face teeth of an angle grinder is characterized by comprising the following steps: the method comprises the following steps:
1) analyzing the tooth shape of the face tooth: making various sizes of the face teeth of the angle grinder, analyzing the tooth form of the face teeth of the angle grinder through KISSsoft software, establishing a three-dimensional model of the face teeth, and checking the strength to meet the strength requirement;
2) designing a primary die for the face teeth: according to the geometric parameters of the face tooth three-dimensional model in the step 1), giving a design scheme of the face tooth preliminary die through KISSsoft software, and manufacturing an upper punching tooth surface of the face tooth preliminary die according to the three-dimensional model;
3) designing a face tooth powder metallurgy die: according to the production process of the powder metallurgy gear, required metal powder is filled into the face tooth primary die, and a powder metallurgy green compact is pressed on a forming machine;
4) warm-pressing forming technology treatment: processing the powder metallurgy green compact obtained in the step 3) by a warm compaction forming technology;
5) sintering heat treatment process: treating the powder metallurgy green compact obtained in the step 4) through a sintering thermal process; obtaining a powder metallurgy face tooth with errors;
6) the principle of backward pushing: comparing the size of the powder metallurgy face tooth with the error in the step 5) with each size of the face tooth formulated in the step 1), calculating the change rate of the powder metallurgy face tooth after warm-pressing forming technology treatment and sintering heat treatment process according to a back-off principle, determining the correct size of a primary face tooth mould according to the rebound rate of the mould, and defining the correct size as a final face tooth powder metallurgy mould;
7) preparing powder metallurgy face teeth of an angle grinder: manufacturing a face tooth powder metallurgy die according to the size of the final face tooth powder metallurgy die determined in the step 6), filling required metal powder into the face tooth powder metallurgy die, and finally obtaining the angle mill powder metallurgy face tooth meeting the size requirement according to the sequence of the steps 3), 4) and 5).
2. The method for preparing the powder metallurgy face tooth of the angle grinder as claimed in claim 1, wherein: the warm compaction forming technology of the step 4) adopts a powder heating system, a powder conveying system and a die heating system to mix the alloy mixed powder and a novel polymer lubricant suitable for the warm compaction process, and then the temperature is raised to 130-150 ℃ to be compacted into green compacts.
3. The method for preparing the powder metallurgy face tooth of the angle grinder as claimed in claim 1, wherein: in the sintering heat treatment process of the step 5), the formed and pressed powder metallurgy green compact is sintered at the temperature range of 1120 ℃, and carburization is carried out under the heat treatment condition to improve the strength.
4. The method for preparing the powder metallurgy face tooth of the angle grinder as claimed in claim 1, wherein: the female die in the face tooth powder metallurgy die finally obtained in the step 7) is made of 40CrNiMo, the upper punch and the lower punch are made of DRM2, and the core rod is made of SKH 9.
5. The method for preparing the angle grinder powder metallurgy face tooth according to the claim 3, wherein: the specific conditions of the heat treatment in the sintering heat treatment process are as follows: the temperature is kept at 890 ℃ and the carbon potential is 0.6 for 2 hours, and then tempering is carried out at 180 ℃ for 2 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110555094.9A CN113333755A (en) | 2021-05-21 | 2021-05-21 | Preparation method of powder metallurgy face tooth of angle grinder |
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| CN202110555094.9A CN113333755A (en) | 2021-05-21 | 2021-05-21 | Preparation method of powder metallurgy face tooth of angle grinder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029513A (en) * | 2022-08-12 | 2022-09-09 | 苏州亚太精睿传动科技股份有限公司 | Manufacturing method of main inductive copper body of gear quenching inductor |
| CN115255369A (en) * | 2022-09-26 | 2022-11-01 | 扬州保来得科技实业有限公司 | Preparation method of powder metallurgy cam lock for head-up type cook machine |
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| CN112264625A (en) * | 2020-10-26 | 2021-01-26 | 扬州海昌新材股份有限公司 | Preparation method of high-density gear |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029513A (en) * | 2022-08-12 | 2022-09-09 | 苏州亚太精睿传动科技股份有限公司 | Manufacturing method of main inductive copper body of gear quenching inductor |
| CN115255369A (en) * | 2022-09-26 | 2022-11-01 | 扬州保来得科技实业有限公司 | Preparation method of powder metallurgy cam lock for head-up type cook machine |
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