CN108480644A - A kind of full-automatic production equipment special and production method of powder metallurgical helical gear - Google Patents
A kind of full-automatic production equipment special and production method of powder metallurgical helical gear Download PDFInfo
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- CN108480644A CN108480644A CN201810327128.7A CN201810327128A CN108480644A CN 108480644 A CN108480644 A CN 108480644A CN 201810327128 A CN201810327128 A CN 201810327128A CN 108480644 A CN108480644 A CN 108480644A
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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
- B22F3/003—Apparatus, e.g. furnaces
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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
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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
- B22F3/03—Press-moulding apparatus therefor
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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
- B22F3/24—After-treatment of workpieces or articles
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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- 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
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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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
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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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
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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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Gears, Cams (AREA)
Abstract
The invention discloses the full-automatic production equipment special and production method of a kind of powder metallurgical helical gear, equipment includes raw material mixed cell, helical gear forming unit, helical gear sintering unit, helical gear surface compact unit, helical gear quenching unit；Its production method includes：(1) preset mass percent is pressed, the powder of each raw material component is uniformly mixed, powder raw material is obtained；(2) powder raw material is placed in beveled wheel mold, the compression moulding at 125~130T of pressure obtains into parison；(3) by described at parison under nitrogen hydrogen sintering atmosphere protective effect, by three-stage sintering technique, obtain density 6.9g/cm3Sintered article；(4) sintered article is placed in device for compactly, densified is carried out by level Four cavity block mold, obtains density 7.0g/cm3Helical gear；(5) alloy is subjected to carburization process, then carries out shaping, deburring, obtain the powder metallurgical helical gear.The present invention solves the problems, such as that helical gear low production efficiency, high rejection rate, automation degree of equipment are high.
Description
Technical field
The invention belongs to powder metallurgy production technical fields, and in particular to a kind of powder metallurgical helical gear it is full-automatic special
Production equipment and production method.
Background technology
In machine driving, gear train is a kind of important transmission system, with the continuous development of science and technology and mechanic
Gear drive is widely used in various engineering in the raising of industry level, and in the automotive industry, gear is the weight of automotive transmission
Want one of parts.Helical gear is a kind of novel transmission parts, it the advantages of it is very much, such as：It is small, light-weight, transmission
Torque increases, and transmission ratio classification is fine, and bearing capacity enhances, and uses lasting, good economy performance.
With Chinese national economy high speed development and machine-building market it is increasingly mature, to the performance requirement of gear
Higher and higher, in the prior art, gear can be also prepared by powder metallurgy, but existing powder metallurgy be prepared it is oblique
Gear is due to preparation process and equipment, the gear of the preparation high rejection rate when needing to carry out finishing, machining in the later stage,
The powder metallurgical helical gear being prepared is caused to cannot be satisfied the needs of rapid economic development.
Invention content
The purpose of the present invention is regarding to the issue above and defect, provide a kind of production equipment of powder metallurgical helical gear and life
Production method.It solves in existing production technology, the technology of gear high rejection rate when needing to carry out finishing, machining in the later stage lacks
It falls into.
In order to achieve the above objectives, present invention employs following technical proposals：
A kind of full-automatic production equipment special of powder metallurgical helical gear includes raw material mixed cell, helical teeth wheel shaping list
Member, helical gear sintering unit, helical gear surface compact unit, helical gear quenching unit and several manipulators；
The raw material mixed cell discharge port is connect with helical gear forming unit feed inlet, helical gear forming unit discharge port
It is connect with helical gear sintering unit feed mouth, manipulator is provided between helical gear sintering unit and helical gear surface compact unit
For semi-finished product to be transported to next unit by a upper unit, set between helical gear surface compact unit and helical gear quenching unit
Manipulator is equipped with for semi-finished product to be transported to next unit by a upper unit；
Shaping grinding apparatus is equipped in the helical gear forming unit, the helical gear, which quenches, is equipped with fine and close dress in unit
It sets；The device for compactly includes the 1st grade of former, the 2nd grade of former, 3rd level former, the 4th grade of former and upper trimming die；1st grade of former,
2nd grade of former, 3rd level former gold and the 4th grade of former are from top to bottom sequentially arranged the former for constituting device for compactly, and upper trimming die is located at
Above former, and helical gear semi-finished product can be pushed to complete surface compact by the former.
As the preferred embodiment of the present invention, the helical gear quenches alternating cloth on the outside of the indoor heating zone of heating of unit
It is equipped with cooling spray and quenching nozzle, solves the problems, such as the excessively high copper pipe melting of temperature.
As the preferred embodiment of the present invention, the compacting tool set of the helical gear forming unit include former, upper mold and under
Mould, wherein lower die are fixed, and upper mold and former are connected with electric rotating machine, can be rotated, and the rotation side of upper mold and former
To opposite.
The invention also discloses a kind of production methods of powder metallurgical helical gear, include the following steps：
(1) preset mass percent is pressed, the powder of each raw material component is uniformly mixed in raw material mixed cell, is obtained
Powder raw material；
(2) powder raw material is placed in the compacting tool set of helical gear forming unit, is suppressed at 125~130T of pressure
Molding, obtains into parison；The compacting tool set is multilayer template powder compaction apparatus, and mould bases is by upper three totally four layers of template once
Composition；
(3) by described at parison under nitrogen hydrogen sintering atmosphere protective effect, by three-stage sintering technique, obtain density
6.9g/cm3Sintered article；
(4) sintered article is placed in device for compactly, densified is carried out by level Four cavity block mold, obtains density
7.0g/cm3Helical gear.
(5) alloy is subjected to carburization process, then carries out shaping, deburring, obtain the powder metallurgical helical gear.
As the preferred embodiment of the present invention, during the step 2) obtains into parison, by keeping lower die to fix,
Former and upper mold are rotated toward opposite direction to be demoulded.
As the preferred embodiment of the present invention, in the step (2) at 125~130T of pressure, carry out heating die compaction at
Type.
As the preferred embodiment of the present invention, the step (3) is specially by three-stage sintering technique：It is sintered gas in nitrogen hydrogen
Under atmosphere protective effect, the pre-heat treatment through 550 DEG C, 650 DEG C, 750 DEG C, 850 DEG C four stages will be preheated to 850 DEG C, respectively at parison
Warm-up phase preheats 20min, by pre- hot article under nitrogen hydrogen sintering atmosphere protective effect, through 1080 DEG C of high temperature sintering 20min, it
First sintered article, through 1130~1140 DEG C of high temperature sintering 20min, is obtained into density under nitrogen hydrogen sintering atmosphere protective effect afterwards
6.9g/cm3Sintered article.
As the preferred embodiment of the present invention, the step (5) is heated to 850~900 DEG C in gaseous carburizing medium,
Isothermal holding 1 hour, oil is cooled to 90~110 DEG C, and rear tempering 3 hours obtains powder metallurgical helical gear.
As the preferred embodiment of the present invention, by percentage to the quality, raw material components composition：Carbon 0.8-1%, copper 0.8-
1.5%, nickel 0.9-1.0%, manganese 0.1-0.3%, micro mist wax 0.6-0.8%, surplus are iron, and the grain size of wherein each component is as follows：
23 μm of carbon dust, 48 μm of copper powder, 48 μm of nickel powder, 48 μm of manganese powder, 23 μm of micro mist wax, 75 μm of iron powder.
Compared with prior art, beneficial effects of the present invention are embodied in：
Raw material is carried out rational proportion by the present invention so that the even density of lower platen on powder metallurgy saw blade of the invention,
And the density of pressing plate is up to 7.0g/cm3More than, the tensile strength of lower platen is reachable on powder metallurgy saw blade of the invention
960MPa, impact energy 5J, case hardness HRB30.The present invention is produced from raw material proportioning to final finished product, realizes helical gear
Automated production, improve work efficiency, reduce employment cost, and ensure that the safety of production.
Description of the drawings
Fig. 1 is the connection diagram of the special equipment of the present invention；
Fig. 2 is helical gear surface compact dedicated unit schematic diagram；
In figure, raw material mixed cell 1, helical gear forming unit 2, helical gear sintering unit 3, helical gear surface compact unit
4, helical gear quenching unit 5, compacting tool set 6, device for compactly 7, the 1st grade of former 8, the 2nd grade of former 9,3rd level former 10, the 4th grade
Former 11, upper trimming die 12.
Specific implementation mode
As shown in Figure 1, a kind of full-automatic production equipment special of powder metallurgical helical gear include raw material mixed cell 1, tiltedly
Gear forming unit 2, helical gear sintering unit 3, helical gear surface compact unit 4, helical gear quenching unit 5 and several machineries
Hand；
1 discharge port of raw material mixed cell is connect with 2 feed inlet of helical gear forming unit, and helical gear forming unit 2 goes out
Material mouth is connect with helical gear sintering 3 feed inlet of unit, is arranged between helical gear sintering unit 3 and helical gear surface compact unit 4
There is manipulator for semi-finished product to be transported to next unit, helical gear surface compact unit 4 and helical gear quenching by a upper unit
Manipulator is provided between unit 5 for semi-finished product to be transported to next unit by a upper unit；
Shaping grinding apparatus is equipped in the helical gear forming unit 2, the helical gear, which quenches, is equipped with fine and close dress in unit 5
Set 7；The device for compactly 7 includes the 1st grade of former 8, the 2nd grade of former 9,3rd level former 10, the 4th grade of former 11 and upper trimming die 12；
1st grade of former 8, the 2nd grade of former 9,10 gold medal of 3rd level former and the 4th grade of former 11, which are from top to bottom sequentially arranged, constitutes device for compactly 7
Former, upper trimming die 12 is located above former, and helical gear semi-finished product can be pushed to pass through the former and complete surface compact.
As the preferred embodiment of the present invention, the helical gear quenches on the outside of the indoor heating zone of heating of unit 5 alternately
It is disposed with cooling spray and quenching nozzle, solves the problems, such as the excessively high copper pipe melting of temperature.
As the preferred embodiment of the present invention, the compacting tool set 6 of the helical gear forming unit 2 include former, upper mold and
Lower die, wherein lower die are fixed, and upper mold and former are connected with electric rotating machine, can be rotated, and the rotation of upper mold and former
Direction is opposite.
The invention also discloses a kind of production methods of powder metallurgical helical gear, include the following steps：
(1) preset mass percent is pressed, the powder of each raw material component is uniformly mixed in raw material mixed cell 1, is obtained
To powder raw material；
(2) powder raw material is placed in the compacting tool set of beveled wheel mold helical gear forming unit 2, in pressure 125
Compression moulding under~130T, obtains into parison；The compacting tool set be multilayer template powder compaction apparatus, mould bases by it is upper once
Three totally four layers of template compositions；
(3) by described at parison under nitrogen hydrogen sintering atmosphere protective effect, by three-stage sintering technique, obtain density
6.9g/cm3Sintered article；
(4) sintered article is placed in device for compactly, densified is carried out by level Four cavity block mold, obtains density
7.0g/cm3Helical gear.
(5) alloy is subjected to carburization process, then carries out shaping, deburring, obtain the powder metallurgical helical gear.
As the preferred embodiment of the present invention, during the step (2) obtains into parison, by keeping lower die solid
Fixed, former and upper mold are rotated toward opposite direction and are demoulded.
As the preferred embodiment of the present invention, in the step (2) at 125~130T of pressure, carry out heating die compaction at
Type.
As the preferred embodiment of the present invention, the step (3) is specially by three-stage sintering technique：It is sintered gas in nitrogen hydrogen
Under atmosphere protective effect, the pre-heat treatment through 550 DEG C, 650 DEG C, 750 DEG C, 850 DEG C four stages will be preheated to 850 DEG C, respectively at parison
Warm-up phase preheats 20min, by pre- hot article under nitrogen hydrogen sintering atmosphere protective effect, through 1080 DEG C of high temperature sintering 20min, it
First sintered article, through 1130~1140 DEG C of high temperature sintering 20min, is obtained into density under nitrogen hydrogen sintering atmosphere protective effect afterwards
6.9g/cm3Sintered article.
As the preferred embodiment of the present invention, the step (5) is heated to 850~900 DEG C in gaseous carburizing medium,
Isothermal holding 1 hour, oil is cooled to 90~110 DEG C, and rear tempering 3 hours obtains powder metallurgical helical gear.
As the preferred embodiment of the present invention, by percentage to the quality, raw material components composition：Carbon 0.8-1%, copper 0.8-
1.0%, nickel 0.9-1.0%, manganese 0.1-0.3%, micro mist wax 0.6-0.8%, surplus are iron, and the grain size of wherein each component is as follows：
23 μm of carbon dust, 48 μm of copper powder, 48 μm of nickel powder, 48 μm of manganese powder, 23 μm of micro mist wax, 75 μm of iron powder.
Embodiment 1
A kind of powder metallurgical helical gear production method proposed by the present invention, includes the following steps：
(1) carbon 0.9%, copper 0.9%, nickel 0.95%, manganese 0.2%, micro mist wax 0.7%, the quality percentage that surplus is iron are pressed
Than the powder of each raw material component being uniformly mixed, wherein each raw material component grain size is as follows：Wherein 23 μm of carbon dust, 48 μm of copper powder, nickel
48 μm of powder, 23 μm of micro mist wax, 75 μm of iron powder obtain powder raw material；
(2) powder raw material is placed in beveled wheel mold, the compression moulding at pressure 127T, using multilayer template powder
Last press device compacting obtains into parison, uses rotation mode to complete helical gear compacting in forming process；
(3) by described at parison under nitrogen hydrogen sintering atmosphere protective effect, through 550 DEG C, 650 DEG C, 750 DEG C, 850 DEG C of quadravalences
The pre-heat treatment of section will be preheated to 850 DEG C at parison, and each warm-up phase preheats 20min, by pre- hot article in nitrogen hydrogen sintering atmosphere
Under protective effect, through 1080 DEG C of high temperature sintering 20min, later by first sintered article under nitrogen hydrogen sintering atmosphere protective effect,
Through 1135 DEG C of high temperature sintering 20min, temperature fluctuation controls within ± 2 DEG C, obtains density 6.9g/cm3Sintered article.
(4) sintered article is placed in device for compactly, densified is carried out by level Four cavity block mold, obtains density
7.0g/cm3Helical gear.
(5) alloy is subjected to carburization process, then carries out shaping, deburring, obtain the powder metallurgical helical gear.
Comparative example 1
Powder metallurgical helical gear production method is as follows in this comparative example：Carbon 0.8%, copper 0.9%, nickel 0.9%, manganese 0.1%,
Micro mist wax 0.6%, the mass percent that surplus is iron, the powder of each raw material component is uniformly mixed, powder raw material is obtained；Remaining
Step is identical as the preparation process of powder metallurgical helical gear is prepared in embodiment 1.
Comparative example 2
Powder metallurgical helical gear production method is as follows in this comparative example：Carbon 1.0%, copper 1.0%, nickel 1.0%, manganese 0.3%,
Micro mist wax 0.8%, the mass percent that surplus is iron, the powder of each raw material component is uniformly mixed, powder raw material is obtained；Remaining
Step is identical as the preparation process of powder metallurgical helical gear is prepared in embodiment 1.
Comparative example 3
Powder metallurgical helical gear production method is as follows in this comparative example：18 μm of reduction each component grain size carbon dust, 45 μm of copper powder,
45 μm of nickel powder, 45 μm of manganese powder, 18 μm of micro mist wax, 62 μm of iron powder obtain powder raw material；Powder is prepared in remaining step and embodiment 1
Last metallurgical helical gear preparation process is identical.
Comparative example 4
Powder metallurgical helical gear production method is as follows in this comparative example：25 μm of increase each component grain size carbon dust, 53 μm of copper powder,
53 μm of nickel powder, 53 μm of manganese powder, 25 μm of micro mist wax, 80 μm of iron powder obtain powder raw material；Powder is prepared in remaining step and embodiment 1
Last metallurgical helical gear preparation process is identical.
Comparative example 5
Powder metallurgical helical gear production method is as follows in this comparative example：Densification technique (4) in embodiment 1 is reduced, remaining step
Suddenly identical as the preparation process of powder metallurgical helical gear is prepared in embodiment 1.
Performance detection is carried out to embodiment one and the pressing plate of production, testing result is as follows：
Testing result shows that embodiment and comparative example compares, and the tensile strength and impact energy of embodiment are substantially better than
Comparative example.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of full-automatic production equipment special of powder metallurgical helical gear, it is characterised in that including raw material mixed cell (1), tiltedly
Gear forming unit (2), helical gear sintering unit (3), helical gear surface compact unit (4), helical gear quenching unit (5) and if
Dry manipulator；
Raw material mixed cell (1) discharge port is connect with helical gear forming unit (2) feed inlet, helical gear forming unit (2)
Discharge port is connect with helical gear sintering unit (3) feed inlet, and helical gear is sintered unit (3) and helical gear surface compact unit (4)
Between be provided with manipulator for semi-finished product to be transported to next unit by a upper unit, helical gear surface compact unit (4) and
Manipulator is provided between helical gear quenching unit (5) for semi-finished product to be transported to next unit by a upper unit；
Shaping grinding apparatus (6) is equipped in the helical gear forming unit (2), the helical gear, which quenches, is equipped with densification in unit (5)
Device (7)；The device for compactly (7) includes the 1st grade of former (8), the 2nd grade of former (9), 3rd level former (10), the 4th grade of former
(11) and upper trimming die (12)；1st grade of former (8), the 2nd grade of former (9), 3rd level former (10) gold and the 4th grade of former (11) are by upper
The former for constituting device for compactly (7) is sequentially arranged under, upper trimming die (12) is located above former, and can push helical gear semi-finished product
Surface compact is completed by the former.
2. a kind of full-automatic production equipment special of powder metallurgical helical gear according to claim 1, it is characterised in that institute
It is alternatingly arranged with cooling spray and quenching nozzle on the outside of the indoor heating zone of heating for the helical gear quenching unit (5) stated.
3. a kind of full-automatic production equipment special of powder metallurgical helical gear according to claim 1, it is characterised in that institute
The compacting tool set (6) for the helical gear forming unit (2) stated includes former, upper die and lower die, and wherein lower die is fixed, upper mold and
Former is connected with electric rotating machine, can be rotated, and the direction of rotation of upper mold and former is opposite.
4. equipment described in a kind of claim 1 carries out the production method of powder metallurgical helical gear, it is characterised in that including following step
Suddenly：
(1) preset mass percent is pressed, the powder of each raw material component is uniformly mixed in raw material mixed cell (1), is obtained
Powder raw material；
(2) powder raw material is placed in the compacting tool set of helical gear forming unit (2), is suppressed at 125~130T of pressure
Molding, obtains into parison；The compacting tool set is multilayer template powder compaction apparatus, and mould bases is by upper three totally four layers of template once
Composition；
(3) by described at parison under nitrogen hydrogen sintering atmosphere protective effect, by three-stage sintering technique, obtain density 6.9g/cm3
Sintered article；
(4) sintered article is placed in device for compactly, densified is carried out by level Four cavity block mold, obtains density
7.0g/cm3Helical gear.
(5) alloy is subjected to carburization process, then carries out shaping, deburring, obtain the powder metallurgical helical gear.
5. production method according to claim 4, it is characterised in that during the step (2) obtains into parison,
By keeping lower die to fix, former and upper mold are rotated toward opposite direction and are demoulded.
6. production method according to claim 4, it is characterised in that in the step (2) at 125~130T of pressure, into
Row heating die compaction is molded.
7. production method according to claim 4, it is characterised in that the step (3) is specific by three-stage sintering technique
For：Under nitrogen hydrogen sintering atmosphere protective effect, the pre-heat treatment through 550 DEG C, 650 DEG C, 750 DEG C, 850 DEG C four stages will be molded
Base is preheated to 850 DEG C, and each warm-up phase preheats 20min, by pre- hot article under nitrogen hydrogen sintering atmosphere protective effect, through 1080 DEG C
High temperature sintering 20min is burnt later by first sintered article under nitrogen hydrogen sintering atmosphere protective effect through 1130~1140 DEG C of high temperature
20min is tied, density 6.9g/cm is obtained3Sintered article.
8. production method according to claim 4, it is characterised in that the step (5) adds in gaseous carburizing medium
Heat is to 850~900 DEG C, and isothermal holding 1 hour, oil is cooled to 90~110 DEG C, and rear tempering 3 hours obtains powder metallurgy helical teeth
Wheel.
9. production method according to claim 4, which is characterized in that by percentage to the quality, raw material components composition：Carbon
0.8-1%, copper 0.8-1.5%, nickel 0.9-1.0%, manganese 0.1-0.3%, micro mist wax 0.6-0.8%, surplus are iron, wherein each group
The grain size divided is as follows：23 μm of carbon dust, 48 μm of copper powder, 48 μm of nickel powder, 48 μm of manganese powder, 23 μm of micro mist wax, 75 μm of iron powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810327128.7A CN108480644A (en) | 2018-04-12 | 2018-04-12 | A kind of full-automatic production equipment special and production method of powder metallurgical helical gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810327128.7A CN108480644A (en) | 2018-04-12 | 2018-04-12 | A kind of full-automatic production equipment special and production method of powder metallurgical helical gear |
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| Publication Number | Publication Date |
|---|---|
| CN108480644A true CN108480644A (en) | 2018-09-04 |
Family
ID=63315975
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810327128.7A Pending CN108480644A (en) | 2018-04-12 | 2018-04-12 | A kind of full-automatic production equipment special and production method of powder metallurgical helical gear |
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| CN (1) | CN108480644A (en) |
Cited By (2)
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| CN111468715A (en) * | 2020-06-03 | 2020-07-31 | 荆州九菱科技股份有限公司 | Production process for preparing powder metallurgy driving gear and preparation device thereof |
| CN112893845A (en) * | 2021-01-19 | 2021-06-04 | 上海大学 | Powder metallurgy high-precision helical gear manufacturing method |
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