CN107363260B - A kind of production technology of powder metallurgy transmission gear - Google Patents
A kind of production technology of powder metallurgy transmission gear Download PDFInfo
- Publication number
- CN107363260B CN107363260B CN201710609203.4A CN201710609203A CN107363260B CN 107363260 B CN107363260 B CN 107363260B CN 201710609203 A CN201710609203 A CN 201710609203A CN 107363260 B CN107363260 B CN 107363260B
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- Prior art keywords
- transmission gear
- sintering
- finished product
- processing
- green compact
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
- B22F3/162—Machining, working after consolidation
-
- 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
-
- 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
-
- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
The invention discloses a kind of production technologies of powder metallurgy transmission gear, drilling after original high temperature sintering present low temperature presintering knot is changed to including processes such as mixing, compression moulding, pre-sintering processing, bore hole/chamfering, deburring, this sintering processes, carburizing and quenching, sandblasting, mill inner hole, inspection, purged and packeds to handle, high temperature sintering again after drilling, since low-temperature sintering product hardness is extremely low, it is convenient for drilling processing.Its remarkable result is: the technique not only meets boring procedure problem through the invention, while meeting the properties of product of client's needs by high temperature sintering, mentions and big improves production efficiency and product drilling processing quality.
Description
Technical field
The present invention relates to transmission gear production technical fields, specifically, being a kind of life of powder metallurgy transmission gear
Production. art.
Background technique
Existing transmission gear is machined out using 40Cr material, and 40Cr material component is fixed, and price compared with
Height can not carry out flexibly allotment to material component itself according to use environment to reach the performance of suitable use condition；And not
It can be made into the part of oil-containing, self-lubricating property is poor.Moreover, process for machining exists, energy consumption is high, the product processing ruler processed
It is very little be difficult to accurately to control, the deficiencies such as Product Precision is low；Meanwhile machining process wants a large amount of raw material of mill off, causes material
Waste, increases cost of manufacture.The prior art also has to be made of powder metallurgy processing technology.
But whether be process for machining or powder metallurgical technique the problem is that: due to transmission gear need into
Row drilling, the hole cannot directly adopt mold molding, it is necessary to use machining mode.And since its bore position is in oblique
Face, if being not easy to bore positive position very much as shown in Figure 1, product hardness is high at this time；If product hardness is low, intensity, hardness
Process requirements are not achieved.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of production technology of powder metallurgy transmission gear,
To overcome the various defects in prior art.
In order to achieve the above objectives, The technical solution adopted by the invention is as follows:
A kind of production technology of powder metallurgy transmission gear, key be the following steps are included:
Step 1: taking each raw material by the parts by weight of constitutive material, after mixing for use；
Step 2: by the green compact of qualified mixed-powder compression moulding transmission gear；
Step 3: green compact being placed on backing plate, and ensure that there are certain intervals between green compact, are sent into sintering furnace and carry out
Pre-sintering processing, sintering time are 1.5~2 hours, and suitable nitrogen and hydrogen are continually fed into sintering furnace；
Step 4: bore hole and chamfered are carried out to treated green compact are pre-sintered using high precision digital control lathe；
Step 5: being positioned by transmission gear of the drilling tool to semi-finished product, and drilling processing is carried out using drilling machine；
Step 6: deburring processing is carried out using transmission gear of the brass wire brush to semi-finished product；
Step 7: the transmission gear of semi-finished product being placed on backing plate, and ensures that there are certain intervals between adjacent, are sent into
This sintering processes is carried out in sintering furnace, sintering time is 1.5~2 hours, and suitable nitrogen and hydrogen are continually fed into sintering furnace；
Step 8: the transmission gear of semi-finished product is heat-treated；
Step 9: the transmission gear of semi-finished product being surface-treated, the transmission gear of finished product is obtained；
Step 10: examining the parameters of finished product transmission gear, after the assay was approved purged and packed.
Further, in step 2 transmission gear green compact compression moulding step are as follows:
Step 2-1: qualified mixed-powder is evacuated in the powder bucket of shaping press；
Step 2-2: the running parameter of shaping press is adjusted, is arranged according to the technological requirements；
Step 2-3: 3~10 green compact samples of pressure testing, using density tester, micrometer respectively to the close of green compact sample
Degree, size are detected, and carry out continuous production after detection is qualified, otherwise shut down simultaneously return step 2-2；
Step 2-4: the green compact after compression moulding are placed in dedicated container.
Further, the density requirements of green compact sample are 7 in step 2-30 +0.05g/cm3, size requirement is 21.80 +0.1mm。
Further, pre-sintering processing described in step 3 is in meshbeltfurnace in carrying out, meshbeltfurnace setting there are three warm area,
The furnace temperature of first warm area is 350~450 DEG C, and the furnace temperature of the second warm area is 550~650 DEG C, the furnace temperature of third warm area is 750~
850 DEG C, green compact are consistent in three warm area duration.
The temperature of each warm area in strict control pre-burning area, so that sintered transmission gear semi-finished product have good structure
Intensity guarantees that hardness is convenient for drilling processing, improves the efficiency and product quality of drilling processing to avoid deformation or damage again.
Further, drilling tool described in step 5 includes drill jig sleeve, mandrel, pressing plate, hold-down bolt, in the drill jig
Set is centrally formed processing district, and the support level for being supported to workpiece slope, the brill are provided in the processing district
Die sleeve is additionally provided with the position limiting structure for being limited to side surface of workpiece, is removably connected with the core at the center of processing district
Axis offers the screw hole that can be matched with hold-down bolt in the free end of the mandrel, and the screw hole is along the center of the mandrel
Line arrangement carries out end face compression to the workpiece being threaded through on mandrel by the pressing plate, hold-down bolt, the one of the drill jig sleeve
Side is also provided with location hole, and the location hole also inwardly runs through the mandrel.
Further, the drill jig sleeve includes generally U-shaped intermediate, is passed through respectively tightly in the two sides of the intermediate
Fixing bolt is connected with baffle, and the intermediate and baffle surround the processing district, the position limiting structure are arranged on the baffle.
In drilling processing, the mandrel of suitable size is fixed on to the processing district center of drill jig sleeve first, it then will be to be drilled
Hole workpiece is sheathed on mandrel, and is limited by position-limit mechanism, is then compressed workpiece by pressing plate and hold-down bolt, this
When workpiece inclined-plane, side and end face be fixed, therefore by location hole can carry out workpiece drilling on inclined surface processing, on
It is easy to operate to state process, production efficiency can be effectively improved；Precision after drilling simultaneously is high, is effectively guaranteed product quality；It adopts
With modular composite structure, the low cost of tooling, it is easy to accomplish and promote；Mandrel uses detachable connection fixed form, can
With certain versatility, enterprise is facilitated to be managed tooling, and reduces the cost of enterprise's fabricating tools.
Further, this sintering processes described in step 7 are carried out using meshbeltfurnace, which is provided with pre-burning area and burns
Interface, wherein the pre-burning area be provided with furnace temperature be respectively 350~450 DEG C, 550~650 DEG C, 750~850 DEG C of three temperature
Area, the sintering zone be provided with furnace temperature be respectively 1000~1100 DEG C, 1100~1130 DEG C, 1100~1130 DEG C, 1100~
1130 DEG C of four warm areas, the hardness of semi-finished product transmission gear is not less than HRB45 after sintering.
Further, heat treatment described in step 8 includes Carburization Treatment, is quenched, drains processing, tempering, heat
The hardness of the transmission gear of semi-finished product is HRC38~42 after processing, depth of hardening is 0.5~0.8mm.
Further, described in step 9 surface treatment include using sand-blasting machine carry out blasting treatment, using internal grinder into
Row mill inner hole processing.
Further, the finished product transmission gear needs the parameters examined to have: size, hardness, bounce, inner hole cone
Degree, roughness and appearance.
Remarkable result of the invention is: drilling after original high temperature sintering is changed to present low temperature presintering knot and is handled, drilling
High temperature sintering again afterwards is convenient for drilling processing since low-temperature sintering product hardness is extremely low, and the technique is not only through the invention
Boring procedure problem is met, while meeting the properties of product of client's needs by high temperature sintering, the big production that improves is proposed and imitates
Rate and product drilling processing quality.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of transmission gear shown in the present invention；
Fig. 2 is the structural schematic diagram of the drilling tool；
Fig. 3 is the schematic diagram of internal structure of the drilling tool；
Fig. 4 is that Fig. 2 removes the structural schematic diagram after pressing plate.
Specific embodiment
Specific embodiment and working principle of the present invention will be described in further detail with reference to the accompanying drawing.
A kind of production technology of powder metallurgy transmission gear, specific steps are as follows:
Step 1: taking each raw material by the parts by weight of constitutive material, after mixing for use；
Step 2: by the green compact of qualified mixed-powder compression moulding transmission gear, step are as follows:
Step 2-1: qualified mixed-powder is evacuated in the powder bucket of shaping press；
Step 2-2: the running parameter of shaping press is adjusted, is arranged according to the technological requirements；
Step 2-3: 5 green compact samples of pressure testing, using density tester, micrometer respectively to the density of green compact sample, ruler
The detection of little progress row carries out continuous production and otherwise shuts down simultaneously return step 2-2, density requirements 7 after detection is qualified0 +0.05g/cm3,
Size requires to be 21.80 +0.1mm；
Step 2-4: the green compact after compression moulding are placed in dedicated container.
Step 3: green compact being placed on backing plate, and ensure that there are certain intervals between green compact, are sent into net belt type sintering furnace
Pre-sintering processing is inside carried out, sintering time is 1.5~2 hours, and suitable nitrogen and hydrogen are continually fed into sintering furnace, is being implemented
When, meshbeltfurnace setting is 350~450 DEG C there are three warm area, the furnace temperature of the first warm area, and the furnace temperature of the second warm area is 550~650
DEG C, the furnace temperature of third warm area is 750~850 DEG C, and green compact are consistent in three warm area duration；
Step 4: bore hole and chamfered are carried out to treated green compact are pre-sintered using high precision digital control lathe；
Step 5: being positioned by transmission gear of the drilling tool to semi-finished product, and drilling processing is carried out using drilling machine；
In the present embodiment, the drilling tool includes drill jig sleeve 1, mandrel 2, pressing plate 3, hold-down bolt 4, referring to attached drawing 2
~attached drawing 4 is provided in the processing district in the processing district that is centrally formed of the drill jig sleeve 1 for propping up workpiece slope
The support level 5 of support, the drill jig sleeve 1 is additionally provided with the position limiting structure 6 for being limited to side surface of workpiece, in processing district
Center is removably connected with the mandrel 2, and the spiral shell that can be matched with hold-down bolt 4 is offered in the free end of the mandrel 2
Hole, which arranges along the center line of the mandrel 2, by the pressing plate 3, hold-down bolt 4 to the workpiece being threaded through on mandrel 2
End face compression is carried out, is also provided with location hole 7 in the side of the drill jig sleeve 1, the location hole 7 also inwardly runs through the mandrel
2。
As shown in Figure 2 and Figure 3, the drill jig sleeve 1 includes generally U-shaped intermediate 1a, in the two sides of intermediate 1a
Baffle 1c, the intermediate 1a and baffle 1c are connected with by fastening bolt 1b respectively and surround the processing district, in the baffle
The position limiting structure 6 is set on 1c.
In the present embodiment, the position limiting structure 6 is limiting slot, and the width of the limiting slot is with the tooth thickness with transmission gear
Degree swings to avoid workpiece when drilling subject to being mutually suitable for and influences processing quality.
Referring to attached drawing 3, the support level 5 is divided into two sides opposite in drill jig sleeve 1, and the top of the support level 5
It is formed to the inclined slope surface 8 in 1 center of drill jig sleeve.
Referring to attached drawing 3 and attached drawing 4, the mandrel 2 is substantially cylindrical, two positioning planes is formed on the mandrel 2, in institute
State it is corresponding on drill jig sleeve 1 be equipped with fixing bolt 9 and be connected to the positioning plane, to realize the fixation of the mandrel 2.
In drilling processing, the mandrel 2 of suitable size is fixed on to the processing district center of drill jig sleeve 1 first, it then will be to
Drilling-workpiece is sheathed on mandrel 2, and is limited by position-limit mechanism 6, then passes through pressing plate 3 and hold-down bolt 4 for workpiece
It compresses, the inclined-plane of workpiece, side and end face are fixed at this time, therefore are bored by the inclined-plane that location hole 7 can carry out workpiece
Hole machined.
Step 6: deburring processing is carried out using transmission gear of the brass wire brush to semi-finished product；
Step 7: the transmission gear of semi-finished product being placed on backing plate, and ensures that there are certain intervals between adjacent, are sent into
This sintering processes is carried out in net belt type sintering furnace, sintering time is 1.5~2 hours, and suitable nitrogen is continually fed into sintering furnace
And hydrogen；The pre-burning area be provided with furnace temperature be respectively 350~450 DEG C, 550~650 DEG C, 750~850 DEG C of three warm areas,
It is respectively 1000~1100 DEG C, 1100~1130 DEG C, 1100~1130 DEG C, 1100~1130 DEG C that the sintering zone, which is provided with furnace temperature,
Four warm areas, after sintering the hardness of semi-finished product transmission gear be not less than HRB45.
Step 8: to the transmission gear of semi-finished product, to carry out include Carburization Treatment, is quenched, drains processing, tempering etc.
The heat treatment process for the treatment of process, the hardness of the transmission gear of semi-finished product is HRC38~42 after heat treatment, depth of hardening is
0.5~0.8mm.
Step 9: blasting treatment being carried out to the transmission gear of semi-finished product, carries out mill inner hole processing using internal grinder, is obtained
The transmission gear of finished product；
Step 10: examining the items such as size, hardness, bounce, hole taper, roughness and the appearance of finished product transmission gear
Parameter, after the assay was approved purged and packed.
Drilling after original high temperature sintering is changed to present segmented sintering processing by this programme: progress low temperature presintering knot first
Processing, this sintering processes of high temperature, convenient for drilling processing, pass through originally since low-temperature sintering product hardness is extremely low again after drilling
It invents the technique and not only meets boring procedure problem, while meeting the properties of product of client's needs by high temperature sintering, mention
Big improves production efficiency and product drilling processing quality.
Claims (8)
1. a kind of production technology of powder metallurgy transmission gear, it is characterised in that include the following steps:
Step 1: taking each raw material by the parts by weight of constitutive material, after mixing for use；
Step 2: by the green compact of qualified mixed-powder compression moulding transmission gear；
Step 3: green compact being placed on backing plate, and ensure that there are certain intervals between green compact, are sent into sintering furnace and carry out pre-burning
Knot processing, sintering time are 1.5~2 hours, and suitable nitrogen and hydrogen are continually fed into sintering furnace；
Step 4: bore hole and chamfered are carried out to treated green compact are pre-sintered using high precision digital control lathe；
Step 5: being positioned by transmission gear of the drilling tool to semi-finished product, and drilling processing is carried out using drilling machine；
Step 6: deburring processing is carried out using transmission gear of the brass wire brush to semi-finished product；
Step 7: the transmission gear of semi-finished product being placed on backing plate, and ensures that there are certain intervals between adjacent, are sent into sintering
This sintering processes is carried out in furnace, sintering time is 1.5~2 hours, and suitable nitrogen and hydrogen are continually fed into sintering furnace；
Step 8: the transmission gear of semi-finished product is heat-treated；
Step 9: the transmission gear of semi-finished product being surface-treated, the transmission gear of finished product is obtained；
Step 10: examining the parameters of finished product transmission gear, after the assay was approved purged and packed；
Drilling tool described in step 5 includes drill jig sleeve (1), mandrel (2), pressing plate (3), hold-down bolt (4), in the drill jig sleeve
(1) the support level (5) for being centrally formed processing district, being provided with for being supported to workpiece slope in the processing district, institute
It states drill jig sleeve (1) and is additionally provided with position limiting structure (6) for being limited to side surface of workpiece, detachably connect at the center of processing district
The mandrel (2) are connected to, the screw hole that can be matched with hold-down bolt (4), the spiral shell are offered in the free end of the mandrel (2)
Hole is arranged along the center line of the mandrel (2), by the pressing plate (3), hold-down bolt (4) to the work being threaded through on mandrel (2)
Part carries out end face compression, is also provided with location hole (7) in the side of the drill jig sleeve (1), the location hole (7) is also inwardly run through
The mandrel (2)；
The drill jig sleeve (1) includes generally U-shaped intermediate (1a), passes through fastening spiral shell respectively in the two sides of the intermediate (1a)
Bolt (1b) is connected with baffle (1c), and the intermediate (1a) and baffle (1c) surround the processing district, on the baffle (1c)
The position limiting structure (6) are set.
2. the production technology of powder metallurgy transmission gear according to claim 1, it is characterised in that: driving cog in step 2
Take turns the compression moulding step of green compact are as follows:
Step 2-1: qualified mixed-powder is evacuated in the powder bucket of shaping press；
Step 2-2: the running parameter of shaping press is adjusted, is arranged according to the technological requirements；
Step 2-3: 3~10 green compact samples of pressure testing, using density tester, micrometer respectively to the density of green compact sample, ruler
The detection of little progress row, carries out continuous production after detection is qualified, otherwise shuts down simultaneously return step 2-2；
Step 2-4: the green compact after compression moulding are placed in dedicated container.
3. the production technology of powder metallurgy transmission gear according to claim 2, it is characterised in that: green compact in step 2-3
The density requirements of sample are 70 +0.05g/cm3, size requirement is 21.80 +0.1mm。
4. the production technology of powder metallurgy transmission gear according to claim 1, it is characterised in that: pre- described in step 3
Sintering processes in meshbeltfurnace in carrying out, and there are three warm area, the furnace temperature of the first warm area is 350~450 DEG C for meshbeltfurnace setting, and second
The furnace temperature of warm area is 550~650 DEG C, and the furnace temperature of third warm area is 750~850 DEG C, and green compact are consistent in three warm area duration.
5. the production technology of powder metallurgy transmission gear according to claim 1, it is characterised in that: described in step 7 originally
Sintering processes are carried out using meshbeltfurnace, which is provided with pre-burning area and sintering zone, wherein the pre-burning area is provided with furnace temperature
Respectively 350~450 DEG C, 550~650 DEG C, 750~850 DEG C of three warm areas, the sintering zone is provided with furnace temperature and is respectively
1000~1100 DEG C, 1100~1130 DEG C, 1100~1130 DEG C, 1100~1130 DEG C of four warm areas, semi-finished product pass after sintering
The hardness of moving gear is not less than HRB45.
6. the production technology of powder metallurgy transmission gear according to claim 1, it is characterised in that: heat described in step 8
Processing includes Carburization Treatment, is quenched, drains processing, tempering, and the hardness of the transmission gear of semi-finished product is after heat treatment
HRC38~42, depth of hardening are 0.5~0.8mm.
7. the production technology of powder metallurgy transmission gear according to claim 1, it is characterised in that: table described in step 9
Surface treatment includes carrying out blasting treatment using sand-blasting machine, carrying out mill inner hole processing using internal grinder.
8. the production technology of powder metallurgy transmission gear according to claim 1, it is characterised in that: the finished product driving cog
Wheel needs the parameters examined to have: size, hardness, bounce, hole taper, roughness and appearance.
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| CN201710609203.4A CN107363260B (en) | 2017-07-25 | 2017-07-25 | A kind of production technology of powder metallurgy transmission gear |
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| CN201710609203.4A CN107363260B (en) | 2017-07-25 | 2017-07-25 | A kind of production technology of powder metallurgy transmission gear |
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| CN111318711B (en) * | 2018-12-17 | 2022-04-22 | 米巴精密零部件（中国）有限公司 | Method for producing at least one hole in a sintered component |
| CN111872642A (en) * | 2020-08-03 | 2020-11-03 | 宁波瑞丰汽车零部件有限公司 | Environment-friendly and energy-saving process method for one-step finished product of small toothed plate of automobile seat |
| CN113560573B (en) * | 2021-08-10 | 2023-06-09 | 苏州中耀科技有限公司 | Surface treatment method for metal powder injection molding pre-sintered blank |
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| JP3702719B2 (en) * | 1999-08-12 | 2005-10-05 | セイコーエプソン株式会社 | Screw manufacturing method |
| KR20020069395A (en) * | 2001-02-26 | 2002-09-04 | 발레오만도전장시스템스코리아 주식회사 | A flanetary gear fabrication method of a starter |
| CN104028765B (en) * | 2014-06-27 | 2016-01-20 | 张家港振江粉末冶金制品有限公司 | A kind of production method of the metallic sintered products with installation through hole |
| CN105312583A (en) * | 2014-08-04 | 2016-02-10 | 吴雯雯 | High-performance powder metallurgy gear convenient to assemble |
| CN204524345U (en) * | 2014-12-29 | 2015-08-05 | 海城市石油机械制造有限公司 | A kind of opening gear ring radial bore fixture |
| CN105499554A (en) * | 2015-11-27 | 2016-04-20 | 宁波市群星粉末冶金有限公司 | Lightweight abrasion-resistant automobile gear and preparation method thereof |
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