CN108044324A - Automatic gearbox sun gear manufacturing process and its cold forging Extruding die - Google Patents
Automatic gearbox sun gear manufacturing process and its cold forging Extruding die Download PDFInfo
- Publication number
- CN108044324A CN108044324A CN201711358978.5A CN201711358978A CN108044324A CN 108044324 A CN108044324 A CN 108044324A CN 201711358978 A CN201711358978 A CN 201711358978A CN 108044324 A CN108044324 A CN 108044324A
- Authority
- CN
- China
- Prior art keywords
- transmission gear
- cold forging
- blank
- cavity die
- extrusion molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/30—Making machine elements wheels; discs with gear-teeth
- B21K1/305—Making machine elements wheels; discs with gear-teeth helical
Abstract
The invention discloses a kind of automatic gearbox sun gear manufacturing process, include the following steps：1. blanking；2. spheroidizing；3. base；4. ball blast；5. it lubricates；6. cold forging extrusion molding：Blank after lubricated is put into cold forging Extruding die, cold forging extrusion molding primary transmission gear；7. jumping-up：Blank after cold forging extrusion molding is put into jumping-up cavity plate, the solid shaft part corresponding to upsetting formation secondary transmission gear；8. machining：Machining is carried out to the blank after jumping-up, processing forms secondary transmission gear, annular groove and hollow shaft；9. it is heat-treated.Using cold forging extrusion molding sun gear primary transmission gear, it reduces small size sun gear machining difficulty and reduces machining amount, production efficiency is high, stock utilization is high, and processing cost is low, and metal streamline is not cut off, grain structure is fine and close, primary transmission gear teeth face intensity is improved, mechanical performance high quality is good, disclosure satisfy that the mating requirement of auto parts and components.
Description
Technical field
The present invention relates to a kind of automatic gearbox sun gear more particularly to small size automatic gearbox sun gears
Manufacturing process and extrusion die.
Background technology
Sun gear is that auto gearbox is used for speed-change and gearshift, transfers the important part of varying load, generally comprises hollow
Shaft body, the outer surface of the hollow shaft body are equipped with primary transmission gear 1 and secondary transmission gear 2, the primary transmission tooth
Annular groove 3 is equipped between wheel 1 and secondary transmission gear 2, the primary transmission gear 1 and secondary transmission gear 2 are helical gear.
Sun gear is since size is small thus adds difficulty to helical tooth flank machining, the root diameter of some primary transmission gears
Only 20mm.Existing manufacturing process one is that bar is selected directly to be produced using cutting technology, this technique shortcoming is to cut
It is low to cut processing efficiency, is suitable only for single-piece or small lot production application；Second is that then hot forging is carried out in machining shaping again
Gear on wall, two kinds of production technologies are all using the method formed gear of traditional machining, are produced suitable for small lot, equipment
Fund input is big, and low production efficiency, stock utilization is low, and the production cycle is long, high processing costs；Secondly, in cutting process
Metal streamline is cut off, and flank of tooth compactness is bad, bad mechanical property, it is difficult to meet auto parts and components matching quality requirement.Country
Department of Intellectual Property discloses a kind of automatic gearbox of vehicles sun gear hot-die Forging Technology（CN201510699523.4）, including
Following steps：Base will be heated to 1000-1100 DEG C for manufacturing the steel alloy of sun gear, be then placed in hotdie forging press
In forged, obtain the sun gear blank；Spheroidizing takes sun gear blank obtained by step 1) from hotdie forging press
Go out, be cooled to 800-850 DEG C with the speed of 5 DEG C/min, carry out spheroidizing processing, after keeping the temperature 2-3h, be cooled to room temperature；It oozes
Blank is put into carburizer by carbon, and 900-950 DEG C is heated in carburizer, is taken out, is cooled to room temperature after keeping the temperature 10-15h；
Blank after Carburization Treatment is carried out quenching treatment by quenching, tempering, and hardening heat is 800-850 DEG C, after keeping the temperature 1-2h, with 10
DEG C/speed of min is cooled to room temperature, then carries out temper, 500-550 DEG C of temperature, after keeping the temperature 2-4h, with 10 DEG C/min
Speed be cooled to room temperature；Endoporus is refined, endoporus, diameter of bore 15mm, diameter of bore fine grinding error 0.01- are refined using emery wheel
0.02mm, grinding wheel diameter 10-15mm, 7500 turns/min of grinding wheel speed, surfaces externally and internally concentricity≤0.15mm；Counterbore is ground, with
It on the basis of grinding endoporus, processed on counter bore bit grinder, grind counterbore；Face grinding, grinds off black skin on surface grinding machine, and two
Faces parallel error is less than 0.002mm；Fine cylindrical on the basis of endoporus, refines blank outer circle, outer circle is straight in centerless grinder
It refines to 30mm, error -0.1-0.1mm in footpath；Gear honing carries out gear honing processing, gear honing speed 1-3m/s, more than gear honing on gear honing machine
Amount≤0.025mm, top gem of a girdle-pendant wheel speed 1000-1100 turn/min, length feed amount 0.05-0.065mm/r；Polishing applies antirust oil, send
Enter gear burnishing machine polishing, coat antirust oil, it is dry, obtain the sun gear.In short, existing manufacturing process：1. machine tool is thrown
Enter big；2. cutter loss is big；3. especially because primary transmission gear size is small thus helical tooth flank machining difficulty is big, production
Efficiency is low；It is 4. of high cost；5. base material is directly processed, metal streamline is cut off, and teeth portion intensity is low, of poor quality；6. waste metal material
Material.
The content of the invention
Technique is shaped not using traditional machining present invention is generally directed to small size automatic gearbox sun gear
Foot, provide it is a kind of use cold forging extrusion molding sun gear primary transmission gear, reduce machining difficulty and reduce cutting plus
The manufacturing process of work amount, the process route is reasonable, and equipment funds input is little, and production efficiency is high, with short production cycle, material use
Rate is high, saves raw material, and processing cost is low, and metal streamline is not cut off, and grain structure is fine and close, improves primary transmission gear teeth
Surface intensity, mechanical performance high quality is good, disclosure satisfy that the mating requirement of auto parts and components.
The present invention is achieved by the following technical solution：
Automatic gearbox sun gear manufacturing process should include hollow shaft body, and the outer surface of the hollow shaft body is equipped with
Primary transmission gear and secondary transmission gear are equipped with annular groove between the primary transmission gear and secondary transmission gear, described
Primary transmission gear and secondary transmission gear are helical gear；Its manufacturing process includes the following steps：1. blanking：Select bar straight
Footpath, the bar length as needed for drawing size cut；2. spheroidizing：Bar is fitted into stove and is heated to 720 DEG C of -780 DEG C of progress
Spheroidizing, Oxygen potential >=90%, hardness≤80HRC；3. base：Peeling scale removal and chamfering；4. ball blast：After base
Blank be sent into shot-blasting machine and make blasting treatment, increase surface Ra values；5. it lubricates：It is carried out after blank blasting treatment at surface lubrication
Reason；6. cold forging extrusion molding：Blank after lubricated is put into cold forging Extruding die, cold forging extrusion molding primary transmission tooth
Wheel；7. jumping-up：Blank after cold forging extrusion molding is put into jumping-up cavity plate, the reality corresponding to upsetting formation secondary transmission gear
Mandrel section；8. machining：Machining is carried out to the blank after jumping-up, processing forms secondary transmission gear, annular groove and sky
Mandrel；9. it is heat-treated.
In cold forging extrusion molding step, cold forging Extruding die is including in upper male mould, upper mold positioning sleeve, nitrogen gas spring, activity
Cavity plate, lower cavity die, pressure block, ejector beam, fixed guide circle, top mold frame, mould bases guide sleeve and guide post, upper mold positioning are set on
Punch-pin upper end surrounding, upper mold positioning are set in fixed guide circle and can be under external force along above and below fixed guide circle inner walls
Mobile, nitrogen gas spring is arranged between upper mold positioning sleeve and movable upper cavity die；Movable upper cavity die and lower cavity die are coaxially matched somebody with somebody for two
The axially extending bore circle set of conjunction, movable upper cavity die are connected with fixed guide circle, and fixed guide circle is fixed in top mold frame, top mold frame
It is connected with mould bases guide sleeve, mould bases guide sleeve is sleeved on guide post and can be moved up and down under external force along guide post；The mould of lower cavity die
Cavity wall is equipped with the screw serrated form to match with primary transmission gear, and pressure block is located at the bottom of lower cavity die, and ejector beam is vertical
Enter lower cavity die die cavity through pressure block.
During cold forging extrusion molding of the present invention, movable upper cavity die and lower cavity die molding, upper male mould downlink, upper mold positioning sleeve is along admittedly
Determine guide collar inner wall and move down nitrogen gas spring compression；As nitrogen gas spring relaxes after the completion of cold forging extruding, upper mold positioning sleeve is driven
It is resetted along fixed guide circle inner wall, upper male mould uplink, while mould bases guide sleeve moves up under external force along guide post, makes upper mold
Frame and the fixed guide circle being attached thereto move up, and so as to which drive activity upper cavity die is moved up and separated with lower cavity die, have
Beneficial to enforcement press forging depanning on ejector beam.
The present invention has the advantages that compared with prior art:
1. cold forging extrusion molding sun gear primary transmission gear of the present invention, mold arrangement is on single-station forcing press, to mating
Press tonnage requirement is smaller, so as to greatly reduce the investment of corollary equipment；
2. cold forging extrusion molding sun gear primary transmission gear of the present invention is all that moment completion forging is squeezed on forcing press, for one
Transmission gear size is small thus this big problem of helical tooth flank machining difficulty for grade, reduces machining difficulty, reduces biography
The machining amount of system improves stock utilization, and production efficiency is high, reduces production cost；
3. cold forging extrusion molding sun gear primary transmission gear of the present invention is all that once property forging is extruded into shape, product on forcing press
Accuracy is high, extrusion forming metal streamline is not cut off, and grain structure is fine and close, improves Gear Surface Strength, and product mechanical performance is high
Quality is good.
Description of the drawings
Fig. 1 is the structure diagram of automatic gearbox sun gear in the embodiment of the present invention；
Fig. 2 is blank deformation process flow chart of the embodiment of the present invention；
Fig. 3 is the structure diagram of cold forging Extruding die in cold forging extrusion molding step of the embodiment of the present invention.
Sequence number in figure：1st, primary transmission gear, 2, secondary transmission gear, 3, annular groove, 4, upper male mould, 5, upper mold positioning
Set, 6, nitrogen gas spring, 7, movable upper cavity die, 8, lower cavity die, 9, pressure block, 10, ejector beam, 11, fixed guide circle, 12, upper mold
Frame, 13, mould bases guide sleeve, 14, guide post.
Specific embodiment
The technical solutions of the present invention will be further described by way of example and in conjunction with the accompanying drawings.
Embodiment：It is shown in Figure 1, a kind of automatic gearbox sun gear, including hollow shaft body, the hollow shaft
The outer surface of body is equipped with primary transmission gear 1 and secondary transmission gear 2, the primary transmission gear 1 and secondary transmission gear 2
Between be equipped with annular groove 3, the primary transmission gear 1 and secondary transmission gear 2 are helical gear.
Referring to shown in Fig. 2 and Fig. 3, which includes the following steps：1. blanking：Choosing
Diameter of rod is selected, the bar length as needed for drawing size cut；2. spheroidizing：Bar is fitted into stove be heated to 720 DEG C-
780 DEG C of progress spheroidizings, Oxygen potential >=90%, hardness≤80HRC；3. base：Peeling scale removal and chamfering；4. ball blast：
Blank after base is sent into shot-blasting machine and makees blasting treatment, increases surface Ra values；5. it lubricates：Table is carried out after blank blasting treatment
Face lubricated；6. cold forging extrusion molding：Blank after lubricated is put into cold forging Extruding die, cold forging extrusion molding one
Grade transmission gear 1；Cold forging Extruding die includes upper male mould 4, upper mold positioning sleeve 5, nitrogen gas spring 6, movable upper cavity die 7, lower cavity die
8th, pressure block 9, ejector beam 10, fixed guide circle 11, top mold frame 12, mould bases guide sleeve 13 and guide post 14, upper mold positioning sleeve 7 are arranged on
6 upper end surrounding of upper male mould, upper mold positioning sleeve 7 are arranged in fixed guide circle 11 and can be under external force along fixed guide circles 11
Inner wall moves up and down, and nitrogen gas spring 6 is arranged between upper mold positioning sleeve 5 and movable upper cavity die 7；Movable upper cavity die 7 and lower cavity die 8
Justify set for the axially extending bore of two coaxial cooperations, movable upper cavity die 7 is connected with fixed guide circle 11, and fixed guide circle 11 is fixed on
In top mold frame 12, top mold frame 12 is connected with mould bases guide sleeve 13, and mould bases guide sleeve 13 is sleeved on guide post 14 and can be under external force
It is moved up and down along guide post 14；The mould intracavity wall of lower cavity die 8 is equipped with the screw serrated form to match with primary transmission gear 1, pressure-bearing
Block 9 is located at the bottom of lower cavity die 8, and ejector beam 10 extends vertically through pressure block 9 and enters 8 die cavity of lower cavity die；7. jumping-up：Cold forging is squeezed
Blank after shaping is put into jumping-up cavity plate, the solid shaft part corresponding to upsetting formation secondary transmission gear 2；8. machining：
Machining is carried out to the blank after jumping-up, processing forms secondary transmission gear 2, annular groove 3 and hollow shaft；9. it is heat-treated.
The present invention is for primary transmission gear size is small thus this big problem of helical tooth flank machining difficulty, use are cold
Extrusion molding sun gear primary transmission gear is forged, small size automatic gearbox sun gear machining difficulty is overcome, subtracts
Equipment investment is lacked, has improved production efficiency and save raw material, reduce production cost；Product accuracy is high simultaneously, squeezes
Forming metal streamline is not cut off, and grain structure is fine and close, improves Gear Surface Strength, product mechanical performance high quality is good.
Embodiment does not form the limit to the scope of the present invention only to facilitate understand technical scheme
System, it is every without departing from any letter that technical spirit perhaps according to the invention makees above scheme in technical solution of the present invention
Single modification, equivalent variations and modification, still fall within the scope of the present invention.
Claims (2)
1. automatic gearbox sun gear manufacturing process should include hollow shaft body, the outer surface of the hollow shaft body is set
Have primary transmission gear (1) with secondary transmission gear (2), the primary transmission gear (1) with secondary transmission gear (2) between be equipped with ring
(3), (1) (2) the primary transmission gear is helical gear with secondary transmission gear to shape slot；Its manufacturing process includes the following steps：①
Blanking：Select diameter of rod, the bar length as needed for drawing size cut；2. spheroidizing：Bar is fitted into stove and is heated to
720 DEG C of -780 DEG C of progress spheroidizings, Oxygen potential >=90%, hardness≤80HRC；3. base：Peeling scale removal and chamfering；
4. ball blast：Blank after base is sent into shot-blasting machine and makees blasting treatment, increases surface Ra values；5. it lubricates：Blank blasting treatment
Surface lubrication processing is carried out afterwards；6. cold forging extrusion molding：Blank after lubricated is put into cold forging Extruding die, cold forging squeezes
Pressing formation primary transmission gear is (1)；7. jumping-up：Blank after cold forging extrusion molding is put into jumping-up cavity plate, upsetting formation two level
Transmission gear (2) corresponding solid shaft part；8. machining：Machining is carried out to the blank after jumping-up, processing forms two level
Transmission gear (2), annular groove (3) and hollow shaft；9. it is heat-treated.
2. automatic gearbox sun gear according to claim 1, it is characterised in that:In cold forging extrusion molding step,
Cold forging Extruding die include upper male mould (4), upper mold positioning sleeve (5), nitrogen gas spring (6), movable upper cavity die (7), lower cavity die (8), pressure block
(9), ejector beam (10), fixed guide circle (11), top mold frame (12), mould bases guide sleeve (13) with guide post (14), (7) upper mold positioning sleeve is arranged on upper male mould
(6) (7) upper end surrounding, upper mold positioning sleeve are arranged in fixed guide circle and can be under external force along above and below fixed guide circle inner walls
It is mobile, nitrogen gas spring be (6) arranged on upper mold positioning sleeve (5) and movable upper cavity die (7) between；(7) (8) movable upper cavity die is with lower cavity die
(7) (11) the axially extending bore circle set of two coaxial cooperations, movable upper cavity die are connected with fixed guide circle, (11) fixed guide circle is fixed on
Top mold frame (12) on, (12) (13) top mold frame is connected with mould bases guide sleeve, (13) mould bases guide sleeve is sleeved on guide post (14) upper and can be under external force
It is (14) moved up and down along guide post；The mould intracavity wall of lower cavity die (8) is equipped with the screw serrated form (1) to match with primary transmission gear, holds
(9) briquetting is located at the bottom of lower cavity die (8), (10) ejector beam extends vertically through pressure block and (9) enters lower cavity die (8) die cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711358978.5A CN108044324A (en) | 2017-12-17 | 2017-12-17 | Automatic gearbox sun gear manufacturing process and its cold forging Extruding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711358978.5A CN108044324A (en) | 2017-12-17 | 2017-12-17 | Automatic gearbox sun gear manufacturing process and its cold forging Extruding die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108044324A true CN108044324A (en) | 2018-05-18 |
Family
ID=62133447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711358978.5A Pending CN108044324A (en) | 2017-12-17 | 2017-12-17 | Automatic gearbox sun gear manufacturing process and its cold forging Extruding die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108044324A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110860644A (en) * | 2019-11-26 | 2020-03-06 | 苏州昆仑重型装备制造有限公司 | Closed extrusion forming process and forging die of output gear shaft |
| CN112058936A (en) * | 2019-06-10 | 2020-12-11 | 上海汽车变速器有限公司 | Cold extrusion molding process of bevel gear |
| CN114700702A (en) * | 2021-10-11 | 2022-07-05 | 太仓久信精密模具股份有限公司 | Forming process of high-speed hot upsetting planetary half-shaft gear |
| CN115570340A (en) * | 2022-09-23 | 2023-01-06 | 重庆旺德福机械有限公司 | Cold extrusion processing technology for bevel wheel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58167020A (en) * | 1982-03-26 | 1983-10-03 | Nissan Motor Co Ltd | Method and apparatus for manufacturing gear |
| JPS6087946A (en) * | 1983-10-20 | 1985-05-17 | Oooka Tankoushiyo:Kk | Working method of clutch gear for transmission of automobile |
| CN201913763U (en) * | 2010-12-24 | 2011-08-03 | 宁波双林模具有限公司 | Precision die for duplicate gears with small spiral angles |
| CN202621811U (en) * | 2012-05-21 | 2012-12-26 | 杨其融 | Helical cylindrical gear toothed and cone gear toothed precision forging die, forged by one hammer in one die, of compound gear |
| CN103801650A (en) * | 2012-11-07 | 2014-05-21 | 四川众友机械有限责任公司 | Precision forging technology of tooth forms of duplex straight toothed spur gears |
| CN106640249A (en) * | 2016-11-17 | 2017-05-10 | 河南柴油机重工有限责任公司 | Engine camshaft duplex bevel gear transmission device |
| CN107355486A (en) * | 2017-08-09 | 2017-11-17 | 江苏威鹰机械有限公司 | New-energy automobile slidably engages set and its manufacturing process |
-
2017
- 2017-12-17 CN CN201711358978.5A patent/CN108044324A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58167020A (en) * | 1982-03-26 | 1983-10-03 | Nissan Motor Co Ltd | Method and apparatus for manufacturing gear |
| JPS6087946A (en) * | 1983-10-20 | 1985-05-17 | Oooka Tankoushiyo:Kk | Working method of clutch gear for transmission of automobile |
| CN201913763U (en) * | 2010-12-24 | 2011-08-03 | 宁波双林模具有限公司 | Precision die for duplicate gears with small spiral angles |
| CN202621811U (en) * | 2012-05-21 | 2012-12-26 | 杨其融 | Helical cylindrical gear toothed and cone gear toothed precision forging die, forged by one hammer in one die, of compound gear |
| CN103801650A (en) * | 2012-11-07 | 2014-05-21 | 四川众友机械有限责任公司 | Precision forging technology of tooth forms of duplex straight toothed spur gears |
| CN106640249A (en) * | 2016-11-17 | 2017-05-10 | 河南柴油机重工有限责任公司 | Engine camshaft duplex bevel gear transmission device |
| CN107355486A (en) * | 2017-08-09 | 2017-11-17 | 江苏威鹰机械有限公司 | New-energy automobile slidably engages set and its manufacturing process |
Non-Patent Citations (1)
| Title |
|---|
| 罗绍兴: "汽车双联主动齿轮的冷锻成型工艺", 《汽车工艺与材料》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112058936A (en) * | 2019-06-10 | 2020-12-11 | 上海汽车变速器有限公司 | Cold extrusion molding process of bevel gear |
| CN110860644A (en) * | 2019-11-26 | 2020-03-06 | 苏州昆仑重型装备制造有限公司 | Closed extrusion forming process and forging die of output gear shaft |
| CN114700702A (en) * | 2021-10-11 | 2022-07-05 | 太仓久信精密模具股份有限公司 | Forming process of high-speed hot upsetting planetary half-shaft gear |
| CN114700702B (en) * | 2021-10-11 | 2023-09-12 | 太仓久信精密模具股份有限公司 | Forming process of high-speed hot upsetting planetary half-shaft gear |
| CN115570340A (en) * | 2022-09-23 | 2023-01-06 | 重庆旺德福机械有限公司 | Cold extrusion processing technology for bevel wheel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108044324A (en) | Automatic gearbox sun gear manufacturing process and its cold forging Extruding die | |
| CN104646956B (en) | Process for machining ball cage bell-like shell | |
| CN103659186A (en) | Medical titanium alloy artificial joint precise forging method | |
| CN102350615A (en) | Shunt blocking forming method for star-shaped sleeve | |
| CN104907474A (en) | Aluminum alloy wheel forging forming technology | |
| CN103707017A (en) | Automatically continuously variable transmission (CVT) V-shaped belt pulley axle finish-forging and plastic- molding process | |
| CN103157758A (en) | Precision forging plastic forming process for inner gear ring in planetary reducer | |
| CN102441773A (en) | Hot precision forging and cold precision shaping compound process for spiral bevel gear | |
| CN103522000A (en) | Machine tool spindle blank processing method | |
| CN112846677A (en) | Vertical forging and rough and finish turning process for driving spiral bevel gear with boss | |
| CN105945519A (en) | Cold forging forming technology of hollow pipe output shaft | |
| CN207547509U (en) | A kind of cold forging Extruding die | |
| CN1337284A (en) | Manufacture of combining tooth blank for automobile gear box | |
| CN107252829A (en) | The accurate near-net-shape technique and device of a kind of bevel gear shaft | |
| CN107355486A (en) | New-energy automobile slidably engages set and its manufacturing process | |
| CN101545440A (en) | Method for manufacturing swivel of actuating lever for motorcycle | |
| CN1544181A (en) | Composite fabrication process for tooth blank of automobile gear shifting box combining tooth | |
| CN207195485U (en) | New-energy automobile slidably engages set and its back extrusion concave | |
| CN110625051B (en) | Manufacturing method for integrally forging three-crank-pin crankshaft forging piece | |
| CN208408424U (en) | A kind of mold for big specification straight bevel gear finish forge molding machine | |
| CN107931503A (en) | A kind of cold forging Extruding die | |
| CN112676506A (en) | Universal joint cross shaft closed forging and forging residual heat normalizing processing technology | |
| CN208513587U (en) | A kind of big specification straight bevel gear finish forge molding machine | |
| CN110551888A (en) | Carburized gear pulsating pressure quenching tool and process | |
| CN101347892A (en) | Technique for molding hardware fittings ball and socket |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180518 |