CN107287521A - A kind of gear casting production process - Google Patents
A kind of gear casting production process Download PDFInfo
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- CN107287521A CN107287521A CN201710510199.6A CN201710510199A CN107287521A CN 107287521 A CN107287521 A CN 107287521A CN 201710510199 A CN201710510199 A CN 201710510199A CN 107287521 A CN107287521 A CN 107287521A
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Gears, Cams (AREA)
Abstract
The invention discloses a kind of gear casting production process, it is related to gear casting field, comprises the following steps：1) raw material simple substance is subjected to melting, obtains fused solution；2) mold and lower mould is made, mold and lower mould are assembled into core shooter, is pressed molding sand in full model by core shooter, molding sand is heating and curing after shaping, standby；3) fused solution is cast into moulding, obtains gear semi-finished product；4) finally by gear semi-finished product after normalizing, tempering and annealing heat-treats.This kind of gear casting production process is simple and convenient, be easily achieved, and production efficiency is high, have the advantages that wearability is good, tensile strength is high, good extending performance, shear strength it is high.
Description
Technical field
The present invention relates to gear casting field, and in particular to a kind of gear casting production process.
Background technology
Gear industry has been obtained for developing rapidly in China.Gear is mutually engageable machine components with teeth, tooth
The application taken turns in transmission is occurred in that very early.
In machine building industry, the material used in manufacture gear has steel, iron, copper alloy and non-metallic material by many kinds
Material etc., it is typically maximum with steel gear application, but steel gear is that its anti-wear performance is poor by being machined manufacture mostly, other
The gear of material, due to respectively there is some different and defects, is only applicable in the occasion of some special requirements.At present, pass
System machining make gear process include blanking, forge, rough turn, normalizing, smart car, gear hobbing, gear shaping, chamfering, chamfered edge and
Grinding out etc., traditional Gear Production process is more, technique is more complicated, and the production cycle is long, and low production efficiency, production cost also compares
It is high.Gear of the prior art is made up of aluminum alloy materials mostly, shareholder, shear strength and extensibility before its wearability, tension
Can have much room for improvement.The technique of manufacture gear is generally now：Stirring-shaping-sintering-packaging.In such a technique, a lot
Company is in order to reduce cost, using simplifying formula or reducing the modes such as technique, although simplifying formula saves cost, can to product
Performance quality, which lacks, to be ensured, can only be used for the product of some least significant ends.
The content of the invention
For problems of the prior art, the invention provides a kind of gear casting production process, this kind of gear casting
Make that simple production process is convenient, be easily achieved, production efficiency is high, with wearability is good, tensile strength is high, good extending performance, cut
The high advantage of shearing stress.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of gear casting production process, is followed the steps below：
(1) raw material simple substance is delivered to melting in electric furnace, obtains fused solution；
The raw material simple substance includes following component by weight ratio：Fe90-110 parts, C0.50-1.10 parts, Si0.74-
1.60 parts, Mn0.80-1.20 parts, Ni0.12-0.18 parts, S0.05-0.07 parts and P0.04-0.06 parts；
(2) design molding is required according to drawing of rough casting paper size, mould includes mold and lower mould, by mold and lower mould
Tool is assembled into core shooter, is pressed molding sand in full model by core shooter, and molding sand is heating and curing under the conditions of temperature is 130-140 DEG C
It is standby after shaping；
(3) fused solution made from step (1) is added into inovulant under the conditions of temperature is 1420-1560 DEG C, stands 40-
In 60min, then the moulding cast into step (2), after the completion of casting, water cooling obtains gear semi-finished product to 430-470 DEG C；
(4) finally by gear semi-finished product after normalizing, tempering and annealing heat-treats.
Further, in step (1), the smelting temperature is 1580-1720 DEG C, and smelting time is 2-3h, heating speed
Rate is 80-100 DEG C/min.
Further, the raw material simple substance includes following component by weight ratio：Fe100 parts, C0.80 parts, Si1.24
Part, Mn1.00 parts, Ni0.15 parts, S0.06 parts and P0.05 parts.
Preferably, in step (2), the molding sand includes the following raw material counted by weight：60 parts of silica sand, modification are recessed
10 parts of native 40 parts of powder, 10 parts of acrylic resin, 8 parts of tertiary amine, 6 parts of silane coupler and water.
Further, the modified attapulgite powder is made by following steps：Concave-convex clay rod is crushed to granular size
To particle diameter≤1mm, then it is immersed into clear water, 10-20min is stirred with electric blender, speed setting is 300~500r/
Min, is then filtered solute being immersed into water-bath heat treatment 1-2h in dilute mineral acid solution, and temperature is set between 70~90 DEG C,
Add dispersant sodium pyrophosphate into the suspension after acidifying again to be sufficiently stirred for, after collaboration supersonic, water-heating method processing 2-3h, finally
Centrifugal treating is carried out to it, after centrifugation, takes upper strata suspension to be transported to after filtering, drying in swinging drying oven and is calcined
1~2h, sintering temperature is 250~350 DEG C.
Further, the molding sand through the following steps that obtain：After silica sand and water are well mixed, third is slowly added to
Olefin(e) acid resin and modified attapulgite powder, are stirring evenly and then adding into silane coupler, are eventually adding tertiary amine, quick stirring mixing 3-5min
After obtain molding sand.
Further, the addition of the inovulant is the 2-4% of mother liquor weight.
Preferably, the inovulant is silicon strontium inovulant.
Further：In step (4), the normalizing is to protect gear semi-finished product under the conditions of temperature is 640-660 DEG C
Warm 30-40min, then it is warming up to 780-810 DEG C, insulation 40-60min；Tempering is that gear semi-finished product are cooled into 430-470 DEG C,
40-50min is incubated, then is risen again to 540-560 DEG C, 40-60min is incubated；Annealing is that gear semi-finished product are cooled into 490-530
DEG C, keep 1-2h.
The present invention has following beneficial effect：Gear casting production process of the present invention is simple and convenient, and production efficiency is high, raw
Process stabilization is produced, highly reliable, the gear product good quality produced, performance indications are high；
(1) more than 60HRC, inner hardness are positively retained at by gear surface hardness level made from production technology of the present invention
Grade is maintained at more than 40HRC, and case-hardening thickness degree is 1.5-1.7mm.Above product gear parameter causes gear using
During cementation zone be not easily disconnected from, gear impact resistance, wearability and intensity it is suitable, the service life of gear is equal
10-20 times of the gear obtained using existing Technology for Heating Processing；
(2) by gear made from production technology of the present invention, its tensile strength is up to more than 480Mpa, and shear strength is up to
More than 300Mpa, and elongation percentage is more than 8, anti-wear performance, case hardness is 2000~2500HV, and wearability is good.Process time is short,
High in machining efficiency, production cost is low.
Embodiment
The embodiment of the present invention is further described with reference to embodiment, following examples are only used for more
Technical scheme is clearly demonstrated, and can not be limited the scope of the invention with this.
Embodiment 1
A kind of gear casting production process, is followed the steps below：
(1) the raw material simple substance needed for gear casting is weighed：Fe80kg、C0.35kg、Si0.52kg、Mn0.40kg、
Ni0.08kg, S0.03kg and P0.02kg；
Raw material simple substance is delivered to melting in electric furnace, the heating rate that electric furnace starts is 80 DEG C/min, and its smelting temperature is
1580 DEG C, smelting time is 2h, and melting finishes to obtain fused solution；
(2) design molding is required according to drawing of rough casting paper size, mould includes mold and lower mould, by mold and lower mould
Tool is assembled into core shooter, is pressed molding sand in full model by core shooter, and molding sand is the shaping that is heating and curing under the conditions of 130 DEG C in temperature
Afterwards, it is standby；
(3) by fused solution made from step (1) under the conditions of temperature is 1420 DEG C, the silicon strontium for adding mother liquor weight 2% is pregnant
Agent is educated, is stood in 40min, then the moulding cast into step (2), after the completion of casting, water cooling obtains gear semi-finished product to 430 DEG C；
(4) gear that gear semi-finished product are finally completed to the present invention after normalizing, tempering and annealing heat-treats casts life
Production, it is comprised the following steps that：Gear semi-finished product are incubated 30min, then be warming up to 780 by normalizing under the conditions of temperature is 640 DEG C
DEG C, it is incubated 40min；Gear semi-finished product are cooled to 430 DEG C by tempering, are incubated 40min, then are risen again to 540 DEG C, are incubated 40min；
Gear semi-finished product are cooled to 490 DEG C by annealing, keep 1h.
Wherein, above-mentioned molding sand includes following raw material：Silica sand 60kg, modified attapulgite powder 40kg, acrylic resin 10kg, uncle
Amine 8kg, silane coupler 6kg and water 10kg.After silica sand and water are well mixed by its preparation method, acrylic resin is slowly added to
With modified attapulgite powder, silane coupler is stirring evenly and then adding into, tertiary amine is eventually adding, type is obtained after quick stirring mixing 3min
Sand.
Above-mentioned modified attapulgite powder is made by following steps：By Concave-convex clay rod be crushed to granular size to particle diameter≤
1mm, is then immersed into clear water, stirs 10min with electric blender, speed setting is 300r/min, is then filtered solute
It is immersed into water-bath in dilute mineral acid solution and is heat-treated 1h, temperature is set between 70 DEG C, then is added into the suspension after acidifying
Dispersant sodium pyrophosphate is sufficiently stirred for, and after collaboration supersonic, water-heating method processing 2h, finally carries out centrifugal treating to it, after centrifugation,
Upper strata suspension is taken to be transported to roasting 1h in swinging drying oven after filtering, drying, sintering temperature is 250 DEG C.
Embodiment 2
A kind of gear casting production process, is followed the steps below：
(1) the raw material simple substance needed for gear casting is weighed：Fe100kg、C0.80kg、Si1.24kg、Mn1.00kg、
Ni0.15kg, S0.06kg and P0.05kg；
Raw material simple substance is delivered to melting in electric furnace, the heating rate that electric furnace starts is 90 DEG C/min, and its smelting temperature is
1650 DEG C, smelting time is 2.5h, and melting finishes to obtain fused solution；
(2) design molding is required according to drawing of rough casting paper size, mould includes mold and lower mould, by mold and lower mould
Tool is assembled into core shooter, is pressed molding sand in full model by core shooter, and molding sand is the shaping that is heating and curing under the conditions of 135 DEG C in temperature
Afterwards, it is standby；
(3) by fused solution made from step (1) under the conditions of temperature is 1490 DEG C, the silicon strontium for adding mother liquor weight 3% is pregnant
Agent is educated, is stood in 50min, then the moulding cast into step (2), after the completion of casting, water cooling obtains gear semi-finished product to 450 DEG C；
(4) gear that gear semi-finished product are finally completed to the present invention after normalizing, tempering and annealing heat-treats casts life
Production, it is comprised the following steps that：Gear semi-finished product are incubated 35min, then be warming up to 795 by normalizing under the conditions of temperature is 650 DEG C
DEG C, it is incubated 50min；Gear semi-finished product are cooled to 450 DEG C by tempering, are incubated 45min, then are risen again to 550 DEG C, are incubated 50min；
Gear semi-finished product are cooled to 520 DEG C by annealing, keep 1.5h.
Wherein, above-mentioned molding sand includes following raw material：Silica sand 60kg, modified attapulgite powder 40kg, acrylic resin 10kg, uncle
Amine 8kg, silane coupler 6kg and water 10kg.After silica sand and water are well mixed by its preparation method, acrylic resin is slowly added to
With modified attapulgite powder, silane coupler is stirring evenly and then adding into, tertiary amine is eventually adding, type is obtained after quick stirring mixing 4min
Sand.
Above-mentioned modified attapulgite powder is made by following steps：By Concave-convex clay rod be crushed to granular size to particle diameter≤
1mm, is then immersed into clear water, stirs 15min with electric blender, speed setting is 400r/min, is then filtered solute
It is immersed into water-bath in dilute mineral acid solution and is heat-treated 1.5h, temperature is set between 80 DEG C, then is added into the suspension after acidifying
Enter dispersant sodium pyrophosphate to be sufficiently stirred for, after collaboration supersonic, water-heating method processing 2.5h, centrifugal treating finally is carried out to it, it is centrifuged
Afterwards, upper strata suspension is taken to be transported to roasting 1.5h in swinging drying oven after filtering, drying, sintering temperature is 300
℃。
Embodiment 3
A kind of gear casting production process, is followed the steps below：
(1) the raw material simple substance needed for gear casting is weighed：Fe120kg、C1.42kg、Si1.84kg、Mn1.60kg、
Ni0.24kg, S0.08kg and P0.07kg；
Raw material simple substance is delivered to melting in electric furnace, the heating rate that electric furnace starts is 100 DEG C/min, and its smelting temperature is
1720 DEG C, smelting time is 3h, melting finishes to obtain fused solution；
(2) design molding is required according to drawing of rough casting paper size, mould includes mold and lower mould, by mold and lower mould
Tool is assembled into core shooter, is pressed molding sand in full model by core shooter, and molding sand is the shaping that is heating and curing under the conditions of 140 DEG C in temperature
Afterwards, it is standby；
(3) by fused solution made from step (1) under the conditions of temperature is 1560 DEG C, the silicon strontium for adding mother liquor weight 4% is pregnant
Agent is educated, is stood in 60min, then the moulding cast into step (2), after the completion of casting, water cooling obtains gear semi-finished product to 470 DEG C；
(4) gear that gear semi-finished product are finally completed to the present invention after normalizing, tempering and annealing heat-treats casts life
Production, it is comprised the following steps that：Gear semi-finished product are incubated 40min, then be warming up to 810 by normalizing under the conditions of temperature is 660 DEG C
DEG C, it is incubated 60min；Gear semi-finished product are cooled to 470 DEG C by tempering, are incubated 50min, then are risen again to 560 DEG C, are incubated 60min；
Gear semi-finished product are cooled to 530 DEG C by annealing, keep 2h.
Wherein, above-mentioned molding sand includes following raw material：Silica sand 60kg, modified attapulgite powder 40kg, acrylic resin 10kg, uncle
Amine 8kg, silane coupler 6kg and water 10kg.After silica sand and water are well mixed by its preparation method, acrylic resin is slowly added to
With modified attapulgite powder, silane coupler is stirring evenly and then adding into, tertiary amine is eventually adding, type is obtained after quick stirring mixing 5min
Sand.
Above-mentioned modified attapulgite powder is made by following steps：By Concave-convex clay rod be crushed to granular size to particle diameter≤
1mm, is then immersed into clear water, stirs 20min with electric blender, speed setting is 500r/min, is then filtered solute
It is immersed into water-bath in dilute mineral acid solution and is heat-treated 2h, temperature is set between 90 DEG C, then is added into the suspension after acidifying
Dispersant sodium pyrophosphate is sufficiently stirred for, and after collaboration supersonic, water-heating method processing 3h, finally carries out centrifugal treating to it, after centrifugation,
Upper strata suspension is taken to be transported to roasting 2h in swinging drying oven after filtering, drying, sintering temperature is 350 DEG C.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, it still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic.All essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (9)
1. a kind of gear casting production process, it is characterised in that comprise the following steps：
(1) raw material simple substance is delivered to melting in electric furnace, obtains fused solution；
The raw material simple substance includes following component by weight ratio：90-110 parts of Fe, 0.50-1.10 parts of C, Si0.74-
0.04-0.06 parts of 1.60 parts, 0.80-1.20 parts of Mn, 0.12-0.18 parts of Ni, 0.05-0.07 parts of S and P；
(2) design molding is required according to drawing of rough casting paper size, mould includes mold and lower mould, by mold and lower set of molds
Core shooter is attached to, is pressed molding sand in full model by core shooter, molding sand is the shaping that is heating and curing under the conditions of 130-140 DEG C in temperature
Afterwards, it is standby；
(3) fused solution made from step (1) is added into inovulant under the conditions of temperature is 1420-1560 DEG C, stands 40-
In 60min, then the moulding cast into step (2), after the completion of casting, water cooling obtains gear semi-finished product to 430-470 DEG C；
(4) finally by gear semi-finished product after normalizing, tempering and annealing heat-treats.
2. a kind of gear casting production process according to claim 1, it is characterised in that：In step (1), the melting
Temperature is 1580-1720 DEG C, and smelting time is 2-3h, and heating rate is 80-100 DEG C/min.
3. a kind of gear casting production process according to claim 1, it is characterised in that：The raw material simple substance is by weight
Proportioning includes following component：100 parts of Fe, 0.80 part of C, 1.24 parts of Si, 1.00 parts of Mn, 0.15 part of Ni, 0.06 part of S and P
0.05 part.
4. a kind of gear casting production process according to claim 1, it is characterised in that：In step (2), the molding sand
Including the following raw material counted by weight：60 parts of silica sand, 40 parts of modified attapulgite powder, 10 parts of acrylic resin, 8 parts of tertiary amine, silicon
10 parts of 6 parts of alkane coupling agent and water.
5. a kind of gear casting production process according to claim 4, it is characterised in that the modified attapulgite powder by with
Lower step is made：Concave-convex clay rod is crushed to granular size to particle diameter≤1mm, is then immersed into clear water, uses electric mixing
Machine stirring 10-20min is mixed, speed setting is 300~500r/min, then filters solute being immersed into dilute mineral acid solution reclaimed water
Bath heat treatment 1-2h, temperature is set between 70~90 DEG C, then addition dispersant sodium pyrophosphate fills into the suspension after acidifying
Divide after stirring, collaboration supersonic, water-heating method processing 2-3h, centrifugal treating finally is carried out to it, after centrifugation, take upper strata suspension warp
Filtering, dry after be transported to 1~2h of roasting in swinging drying oven, sintering temperature is 250~350 DEG C.
6. a kind of gear casting production process according to claim 5, it is characterised in that the molding sand is by following step
Suddenly obtain：After silica sand and water are well mixed, acrylic resin and modified attapulgite powder are slowly added to, silicon is stirring evenly and then adding into
Alkane coupling agent, is eventually adding tertiary amine, and molding sand is obtained after quick stirring mixing 3-5min.
7. a kind of gear casting production process according to claim 1, it is characterised in that the addition of the inovulant is
The 2-4% of mother liquor weight.
8. a kind of gear casting production process according to claim 7, it is characterised in that the inovulant is that silicon strontium breeds
Agent.
9. a kind of gear casting production process according to claim 1, it is characterised in that：In step (4), the normalizing
It is that gear semi-finished product are incubated 30-40min under the conditions of temperature is 640-660 DEG C, then is warming up to 780-810 DEG C, insulation 40-
60min；Tempering is that gear semi-finished product are cooled into 430-470 DEG C, is incubated 40-50min, then is risen again to 540-560 DEG C, is incubated
40-60min；Annealing is that gear semi-finished product are cooled into 490-530 DEG C, keeps 1-2h.
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| CN201710510199.6A CN107287521A (en) | 2017-06-28 | 2017-06-28 | A kind of gear casting production process |
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Cited By (3)
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|---|---|---|---|---|
| CN108588553A (en) * | 2018-03-28 | 2018-09-28 | 徐州东鑫铸造有限公司 | A kind of gear casting production process |
| CN110229988A (en) * | 2019-05-21 | 2019-09-13 | 台州格凌机械有限公司 | A kind of high-strength vehicle mileometer gear and preparation method thereof |
| CN111673400A (en) * | 2020-06-18 | 2020-09-18 | 苏州伊泰克汽配科技有限公司 | Machining process of automobile seat adjuster gear |
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| 李传栻 等: "《铸造技术应用手册》", 31 January 2012, 中国电力出版社 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108588553A (en) * | 2018-03-28 | 2018-09-28 | 徐州东鑫铸造有限公司 | A kind of gear casting production process |
| CN110229988A (en) * | 2019-05-21 | 2019-09-13 | 台州格凌机械有限公司 | A kind of high-strength vehicle mileometer gear and preparation method thereof |
| CN111673400A (en) * | 2020-06-18 | 2020-09-18 | 苏州伊泰克汽配科技有限公司 | Machining process of automobile seat adjuster gear |
| CN111673400B (en) * | 2020-06-18 | 2022-04-01 | 苏州伊泰克汽配科技有限公司 | Machining process of automobile seat adjuster gear |
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