CN201913763U - Precision die for duplicate gears with small spiral angles - Google Patents

Precision die for duplicate gears with small spiral angles Download PDF

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Publication number
CN201913763U
CN201913763U CN2010206787198U CN201020678719U CN201913763U CN 201913763 U CN201913763 U CN 201913763U CN 2010206787198 U CN2010206787198 U CN 2010206787198U CN 201020678719 U CN201020678719 U CN 201020678719U CN 201913763 U CN201913763 U CN 201913763U
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CN
China
Prior art keywords
plate
mold insert
backing plate
die
gear
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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.)
Expired - Lifetime
Application number
CN2010206787198U
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Chinese (zh)
Inventor
顾来法
孙武剑
蔡行海
邬建成
蒋林仙
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NINGBO SHUANGLIN MOULD CO Ltd
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NINGBO SHUANGLIN MOULD CO Ltd
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Priority to CN2010206787198U priority Critical patent/CN201913763U/en
Application granted granted Critical
Publication of CN201913763U publication Critical patent/CN201913763U/en
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Abstract

A precision die for duplicate gears with small spiral angles comprises a fixed die seat plate, a gate die plate, a fixed die plate, a movable die plate, a first cushion plate, a second cushion plate and an open die plate. An upper cavity is arranged on the fixed die plate, a lower cavity which corresponds to the upper cavity is disposed on the movable die plate, a shaft insert is laid in the upper cavity, a secondary gear insert is laid on the upper side of the lower cavity, a primary gear insert and a bottom insert are laid in the lower cavity, a connector is fixed to the bottoms of the primary gear insert and the bottom insert, a lead screw is fixed to the bottom of the connector, the lower end of the lead screw is fixed onto the second cushion plate via a press plate, and a nut fixed on the first cushion plate is in running fit with the lead screw. The precision die adopts matching of the lead screw with the nut to drive the primary gear insert and the bottom insert to rotate along the direction of a gear spiral angle of the primary gear insert when an open die of an injection molding machine moves linearly, realizes stripping of products and has the advantages of short forming cycle, small appearance and reliable action.

Description

The precision die that is used for the low pitch angle duplicate gear
Technical field
The utility model relates to a kind of mould that is used to make the low pitch angle duplicate gear, and a kind of specifically can the rotation synchronously when the straight line die sinking makes the mould of low pitch angle duplicate gear automatic demoulding.
Background technology
The helical gear moulding is owing to have helical angle, so demoulding difficulty is higher, to the mold releasability of single helical gear the time, can adopt push rod to move up usually, makes helical gear promote gear and rotates mould.As Patent Office of the People's Republic of China's on July 7th, 2004 disclosed Granted publication number be " plastic beveled wheel mold " of " CN2623438 ", it is by core, tapered core, gear ring, mold insert, moving platen, fixed head, backing plate, push rod is formed, core is contained in the tapered core, and gear ring is connected with mold insert with bearing pin, and mold insert is enclosed within on the tapered core, and cooperate with moving platen by bearing, fixed head be contained in moving platen below, and be connected with backing plate with bearing pin, push rod passes backing plate and tapered core.But to the duplicate gear shaping and demoulding of low pitch angle the time, this mould just can't be finished the demoulding, must be earlier by the spiral mould emptier to the demoulding of one-level gear, again by modes such as push rods to the secondary gear demoulding.Spiral mould emptier now commonly used is oil cylinder, gear, rackwork, or the mechanism of motor, sprocket wheel, chain.These several spiral mould emptiers commonly used all are after injection machine is opened fully, again by the oil hydraulic system effect, drive the motion of oil cylinder or motor and finish the screw demoulding.Like this will be more time-consuming in the process of the demoulding, and this spiral mould emptier anglec of rotation is difficult to coincide with the helical angle of duplicate gear, therefore damages when regular meeting makes product in the demoulding, cause poor product quality, qualification rate low.
The utility model content
The purpose of this utility model is at the defective of above-mentioned prior art and deficiency, a kind of molding cycle is short, die shape is little, the mould that can make low pitch angle duplicate gear moulding automatic demoulding of reliable in action for people provide, and the good product quality of being produced, qualification rate height.
Technical solution adopted in the utility model is for achieving the above object: this is used for the precision die of low pitch angle duplicate gear, it comprises the top clamping plate that sets gradually, the cast gate template, solid plate, moving platen, first backing plate, second backing plate and die sinking plate, wherein the moving platen and first backing plate are fixed, second backing plate and die sinking plate are fixed, described solid plate is provided with upper impression, moving platen is provided with the lower impressions relative with upper impression, on upper impression, be embedded with a mold insert, above lower impressions, be embedded with the secondary gear mold insert, in lower impressions, be embedded with one-level gear mold insert and bottom surface mold insert, one-level gear mold insert is set in the outside of bottom surface mold insert, by upper impression, lower impressions, the axle mold insert, one-level gear mold insert, the space that secondary gear mold insert and bottom surface mold insert are surrounded is the die cavity of duplicate gear, communicate with die cavity by the runner that is opened on solid plate and the upper impression at the sprue bush on the cast gate template, the bottom of described one-level gear mold insert and bottom surface mold insert is set with connector, be interspersed in upper pin on the connector and be horizontally through the sidewall of one-level gear mold insert and bottom surface mold insert, the bottom of connector is plugged with screw mandrel, be interspersed in lower bearing pin on the connector and be horizontally through the sidewall of screw mandrel, the lower end of this screw mandrel is fixed on second backing plate by pressing plate, the nut of fixing on first backing plate cooperates with screw mandrel is movable, in the die sinking plate, be provided with top board guide pillar and support column, the guide pin bushing that has in the top board of push rod is set on the top board guide pillar, be provided with the jacking block that is interspersed in the die sinking plate in the bottom of top board, screw mandrel is passed in described push rod upper end, connector, relative behind the mold insert of bottom surface with cavity bottom.
The helical angle of described screw mandrel and nut is consistent with the gear helical angle direction of one-level gear mold insert.
Be installed with the location mold insert on the upper surface of described connector, the upper end of this location mold insert is a taper seat, offers the detent relative with locating mold insert in the bottom of lower impressions.
The upper end of described push rod offers and the relative location blind hole in axle mold insert bottom.
Be fixed with release link on the described top board, the upper surface that this release link upper end is passed behind second backing plate, first backing plate with moving platen interlocks, and is set with back-moving spring on release link, and back-moving spring is supported between the top board and first backing plate.
The sidewall of described upper impression is interspersed with cooling water pipe, cooling water pipe under the sidewall of lower impressions is interspersed with.
Be interspersed with first pull bar on the described solid plate, this first pull bar top links to each other with the cast gate template by screw thread, the bolt head activity of its bottom is interspersed in the through hole of the moving platen and first backing plate, also be provided with first spring that is sleeved on first pull bar in solid plate, the upper end of this first spring and cast gate template offset.
Be interspersed with second pull bar on described first backing plate, this second pull bar bottom links to each other with second backing plate by screw thread, the bolt head activity at its top is interspersed in the counterbore of moving platen, also be provided with second spring that is sleeved on second pull bar in first backing plate, the lower end of this second spring and second backing plate offset.
Described solid plate sidewall is installed with the die sinking accessory plate, the lower end of this die sinking accessory plate is provided with stopper slot, the described second backing plate sidewall is provided with the limited block relative with stopper slot, the bottom of limited block is equipped with the compression spring, sidewall at limited block is provided with chute with the level, is installed with the limited screw that head stretches into chute on second backing plate.
The outside of described die sinking accessory plate is coated with baffle plate, and this baffle plate fixes by the screw and first backing plate.
The utility model is by the cooperation of screw mandrel and nut, when the rectilinear motion of mould die sinking, screw mandrel can drive the gear helical angle direction that connector, one-level gear mold insert, bottom surface mold insert prolong one-level gear mold insert and rotate synchronously, the one-level gear mold insert and the one-level gear of product are separated, finish the demoulding the one-level gear.Move up together by promotion jacking block drive top board, push rod then, product is slowly released from the secondary gear mold insert, product can prolong the helical angle of self and rotate, thereby finishes the demoulding of secondary gear.The restoring force of back-moving spring can make top board and push rod reset after the secondary gear demoulding is finished.The utlity model has that molding cycle is short, die shape is little, the advantage of reliable in action, and good product quality, the qualification rate height produced.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the A-A cutaway view of Fig. 1.
Fig. 3 is the upper and lower die cavity part partial enlarged drawing of Fig. 1.
The specific embodiment
As shown in Figure 1 and Figure 2, the utility model is a kind of precision die that is used for the low pitch angle duplicate gear, it comprises top clamping plate 44, cast gate template 3, solid plate 5, moving platen 7, first backing plate 8, second backing plate 10 and the die sinking plate 14 that sets gradually, wherein the moving platen 7 and first backing plate 8 are fixing, and second backing plate 10 is fixing with die sinking plate 14.Therefore being the first die joint PL1 between cast gate template 3 and solid plate 5, is the second die joint PL2 between solid plate 5 and moving platen 7, is three parting line PL3 between first backing plate 8 and second backing plate 10.First guide rod 27 is installed on top clamping plate 44, the lower end activity of this first guide rod 27 is interspersed in solid plate 5, moving platen 7, first backing plate 8 and second backing plate 10, be fixed with second guide rod 38 on second backing plate 10, the upper end activity of this second guide rod 38 is interspersed in first backing plate 8, moving platen 7 and the solid plate 5.First guide rod 27 and second guide rod 38 can prevent that mould from misplacing when the opening and closing mould.Be interspersed with first pull bar 16 on the described solid plate 5, these first pull bar, 16 tops link to each other with cast gate template 3 by screw thread, the bolt head activity of its bottom is interspersed in the through hole of the moving platen 7 and first backing plate 8, in solid plate 5, also be provided with first spring 15 that is sleeved on first pull bar 16, the upper end of this first spring 15 and cast gate template 3 offset, when mould die sinking campaign, the restoring force of first spring 15 can make the first die joint PL1 open.When the first die joint PL1 is opened to a certain degree, the bottom bolt head and the solid plate 5 of first pull bar 16 interlock, this moment, solid plate 5 was no longer mobile, moving platen 7, first backing plate 8, second backing plate 10 and 14 of die sinking plates continue to move, and the second die joint PL2 between solid plate 5 and the moving platen 7 is opened.Described solid plate 5 sidewalls are installed with die sinking accessory plate 18, the lower end of this die sinking accessory plate 18 is provided with stopper slot 24, described second backing plate, 10 sidewalls are provided with the limited block 22 relative with stopper slot 24, the bottom of limited block 22 is equipped with compression spring 21, sidewall at limited block 22 is provided with chute with the level, on second backing plate 10, be installed with head and stretch into the limited screw 20 of chute, deviate to prevent limited block 22.When the second die joint PL2 was opened to a certain degree, limited block 22 can offset with the lower edge of stopper slot 24.The outside of described die sinking accessory plate 18 is coated with baffle plate 23, and this baffle plate 23 fixes by the screw and first backing plate 10, in order to prevent the lower end perk of die sinking accessory plate 18.Be interspersed with second pull bar 17 on described first backing plate 8, these second pull bar, 17 bottoms link to each other with second backing plate 10 by screw thread, the bolt head activity at its top is interspersed in the counterbore of moving platen 7, in first backing plate 8, also be provided with second spring 19 that is sleeved on second pull bar 17, the lower end of this second spring 19 and second backing plate 10 offset, when mould die sinking campaign, the restoring force of second spring 19 can make the moving platen 7 and first backing plate 8 move up with respect to second backing plate 10, three parting line PL3 is opened, when the bolt head of the upper end of second pull bar 17 and the counterbore on the moving platen 7 interlocked, three parting line PL3 opened fully.
Described solid plate 5 is provided with at least one upper impression 4, and moving platen 7 is provided with the lower impressions 6 relative with upper impression 4.Be embedded with a mold insert 31 on upper impression 4, be embedded with secondary gear mold insert 32 above lower impressions 6, be embedded with one-level gear mold insert 33 and bottom surface mold insert 34 in lower impressions 6, one-level gear mold insert 33 is set in the outside of bottom surface mold insert 34.The space that is surrounded by upper impression 4, lower impressions 6, axle mold insert 31, one-level gear mold insert 33, secondary gear mold insert 32 and bottom surface mold insert 34 is the die cavity 28 of duplicate gear.Communicate with die cavity 28 by the runner 2 that is opened on solid plate 5 and the upper impression 4 at the sprue bush on the cast gate template 31, from hot melting plastic cooling forming after runner 2 arrives die cavities 28 of sprue bush 1 injection.The sidewall of described upper impression 4 is interspersed with cooling water pipe 29, and cooling water pipe 30 under the sidewall of lower impressions 6 is interspersed with feeds cooling waters at upper and lower cooling water pipe 29,30 product in the die cavity 28 is cooled off fast.Product lower end after the moulding is that one-level gear, upper end are secondary gear.
As shown in Figure 3, the bottom of described one-level gear mold insert 33 and bottom surface mold insert 34 is set with connector 36, be interspersed in upper pin 35 on the connector 36 and be horizontally through the sidewall of one-level gear mold insert 33 and bottom surface mold insert 34, the bottom of connector 36 is plugged with screw mandrel 40, be interspersed in lower bearing pin 37 on the connector 36 and be horizontally through the sidewall of screw mandrel 40, make screw mandrel 40, connector 36, one-level gear mold insert 33 and the bottom surface mold insert 34 can synchronization action.The lower end of screw mandrel 40 is fixed on second backing plate 10 by pressing plate 41, fixes nut 39 and 40 movable cooperations of screw mandrel on first backing plate 8.The helical angle of described screw mandrel is consistent with the gear helical angle direction of one-level gear mold insert, angle when therefore screw mandrel 40 rotates and the helical angle of one-level gear are coincide, screw mandrel 40 drives connector 36, one-level gear mold insert 33,34 rotations of bottom surface mold insert, can make the one-level gear can the complete demoulding, can effectively avoid product when the demoulding, to sustain damage.Be installed with location mold insert 43 on the upper surface of described connector 36, the upper end of this location mold insert 43 is a taper seat, offers the detent relative with locating mold insert 43 in the bottom of lower impressions 6.By cooperating of location mold insert 43 and detent, can accurately locate the position of one-level gear mold insert 33 and bottom surface mold insert 34, make the product size of production meet standard.
In die sinking plate 14, be provided with top board guide pillar 25 and support column 42, the guide pin bushing that has in the top board 12 of push rod 26 is set in top board guide pillar 26, be provided with the jacking block 13 that is interspersed in the die sinking plate 14 in the bottom of top board 12, it is relative with die cavity 28 bottoms that screw mandrel 40, connector 36, bottom surface mold insert 34 backs are passed in described push rod 26 upper ends.Offer and the relative location blind hole in axle mold insert 31 bottoms in the upper end of push rod 26, energy is the position of locating shaft mold insert 31 accurately, product axis hole off-centre when preventing to inject.Be fixed with on the described top board 12 and reset 9, second backing plate 10 is passed in these release link 9 upper ends, first backing plate, 8 backs interlock with the upper surface of moving platen 7, therefore when three parting line PL3 opened, top board 12 and moving platen 7 same moved further can guarantee that push rod 26 pastes mutually with the product bottom.After the demoulding of one-level gear, by promoting jacking block 13 top board 12 drive push rods 26 are moved up, thereby with the slow jack-up of product, product can prolong the helical angle of self and rotate, thereby finish the demoulding of secondary gear.Top board 12 is set with back-moving spring 11 with moving platen 7 on release link 9, back-moving spring 11 is supported between the top board 12 and first backing plate 8, and the restoring force of back-moving spring 11 can make top board 12 and push rod 13 reset after the secondary gear demoulding is finished.
When die sinking, mould drives die sinking plate 14 and moves down, and this moment, the first die joint PL1 opened, and makes sprue bush 1 demoulding under the 15 restoring force effects of first spring.When the first die joint PL1 opens to the bottom bolt head of first pull bar 16 and solid plate 5 and interlocks, solid plate 5 can't continue to move, this moment is under the mould opening force effect, the second die joint PL2 opens, and offsets until the limited block 22 of second backing plate, 10 sidewalls and the lower edge of the stopper slot 24 on the die sinking accessory plate 18.This moment, upper impression 4 was also separated with lower impressions 6, and axle mold insert 31 is thrown off with upper impression 4 and product center, and product is stayed in the lower impressions 6.Under the effect of second spring, 19 restoring forces, three parting line PL3 opens, moving platen 7, first backing plate 8 and top board 12 move up synchronously, because the effect of screw mandrel 40 and nut 39 screw threads, the gear helical angle that screw mandrel 40 drive connectors 36, one-level gear mold insert 33, bottom surface mold insert 34 prolong one-level gear mold insert 33 rotates synchronously, the one-level gear mold insert 33 and the one-level gear of product are separated, finish the demoulding the one-level gear.Jacking block 13 drives top board 12, push rod 26 moves up together by promoting then, and product is slowly released from secondary gear mold insert 32, and product can prolong the helical angle of self and rotate, thereby finishes the demoulding of secondary gear.Top board 12 is set with back-moving spring 11 with moving platen 7 on release link 9, back-moving spring 11 is supported between the top board 12 and first backing plate 8, and the restoring force of back-moving spring 11 can make top board 12 and push rod 13 reset after the secondary gear demoulding is finished.

Claims (10)

1. precision die that is used for the low pitch angle duplicate gear, it comprises top clamping plate (44) the cast gate template (3) that sets gradually, solid plate (5), moving platen (7), first backing plate (8), second backing plate (10) and die sinking plate (14), wherein moving platen (7) is fixing with first backing plate (8), second backing plate (10) is fixing with die sinking plate (14), described solid plate (5) is provided with at least one upper impression (4), moving platen (7) is provided with the lower impressions (6) relative with upper impression (4), on upper impression (4), be embedded with a mold insert (31), be embedded with secondary gear mold insert (32) in lower impressions (6) top, in lower impressions (6), be embedded with one-level gear mold insert (33) and bottom surface mold insert (34), one-level gear mold insert (33) is set in the outside of bottom surface mold insert (34), by upper impression (4), lower impressions (6), axle mold insert (31), one-level gear mold insert (33), secondary gear mold insert (32) and bottom surface mold insert (34) space that is surrounded are the die cavity (28) of duplicate gear, communicate with die cavity (28) by the runner (2) that is opened on solid plate (5) and the upper impression (4) at the sprue bush (1) on the cast gate template (3), the bottom that it is characterized in that described one-level gear mold insert (33) and bottom surface mold insert (34) is set with connector (36), with being interspersed in the sidewall that upper pin (35) on the connector (36) is horizontally through one-level gear mold insert (33) and bottom surface mold insert (34) three is fixed, be plugged with screw mandrel (40) in the bottom of connector (36), be fixed together with being interspersed in the sidewall that lower bearing pin (37) on the connector (36) is horizontally through screw mandrel (40), the lower end of this screw mandrel (40) is fixed on second backing plate (10) by pressing plate (41), nut (39) cooperates with screw mandrel (40) is movable, in die sinking plate (14), be provided with top board guide pillar (25) and support column (42), the guide pin bushing that has in the top board (12) of push rod (26) is set on the top board guide pillar (25), be provided with the jacking block (13) that is interspersed in the die sinking plate (14) in the bottom of top board (12), screw mandrel (40) is passed in described push rod (26) upper end, connector (36), bottom surface mold insert (34) back is relative with die cavity (28) bottom.
2. the precision die that is used for the low pitch angle duplicate gear according to claim 1 is characterized in that the helical angle of described screw mandrel (40) and nut (39) is consistent with the gear helical angle direction of one-level gear mold insert (33).
3. the precision die that is used for the low pitch angle duplicate gear according to claim 1, it is characterized in that being installed with on the upper surface of described connector (36) location mold insert (43), the upper end of this location mold insert (43) is a taper seat, offers in the bottom of lower impressions (7) and locatees the relative detent of mold insert (43).
4. the precision die that is used for the low pitch angle duplicate gear according to claim 1 is characterized in that the upper end of described push rod (26) offers and the relative location blind hole in axle mold insert (31) bottom.
5. the precision die that is used for the low pitch angle duplicate gear according to claim 1, it is characterized in that being fixed with on the described top board (12) release link (9), second backing plate (10) is passed in this release link (9) upper end, first backing plate (8) back interlocks with the upper surface of moving platen (7), be set with back-moving spring (11) on release link (9), this back-moving spring (11) is supported between top board (12) and first backing plate (8).
6. according to claim 1 or 2 or 3 or the 4 or 5 described precision dies that are used for the low pitch angle duplicate gear, the sidewall that it is characterized in that described upper impression (4) is interspersed with cooling water pipe (29), cooling water pipe (30) under the sidewall of lower impressions (6) is interspersed with.
7. the precision die that is used for the low pitch angle duplicate gear according to claim 6, it is characterized in that being interspersed with on the described solid plate (5) first pull bar (16), this first pull bar (16) top links to each other with cast gate template (3) by screw thread, the bolt head activity of its bottom is interspersed in the through hole of moving platen (7) and first backing plate (8), also be provided with first spring (15) that is sleeved on first pull bar (16) in solid plate (5), the upper end of this first spring (15) and cast gate template (3) offset.
8. the precision die that is used for the low pitch angle duplicate gear according to claim 7, it is characterized in that being interspersed with on described first backing plate (8) second pull bar (17), this second pull bar (17) bottom links to each other with second backing plate (10) by screw thread, the bolt head activity at its top is interspersed in the counterbore of moving platen (7), also be provided with second spring (19) that is sleeved on second pull bar (17) in first backing plate (8), the lower end of this second spring (19) and second backing plate (10) offset.
9. the precision die that is used for the low pitch angle duplicate gear according to claim 8, it is characterized in that described solid plate (5) sidewall is installed with die sinking accessory plate (18), the lower end of this die sinking accessory plate (18) is provided with stopper slot (24), described second backing plate (10) sidewall is provided with the limited block (22) relative with stopper slot (24), the bottom of limited block (22) is equipped with compression spring (21), sidewall at limited block (22) is provided with chute with the level, is installed with the limited screw (20) that head stretches into chute on second backing plate (10).
10. the precision die that is used for the low pitch angle duplicate gear according to claim 9 is characterized in that the outside of described die sinking accessory plate (18) is coated with baffle plate (23), and this baffle plate (23) fixes by screw and first backing plate (8).
CN2010206787198U 2010-12-24 2010-12-24 Precision die for duplicate gears with small spiral angles Expired - Lifetime CN201913763U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010206787198U CN201913763U (en) 2010-12-24 2010-12-24 Precision die for duplicate gears with small spiral angles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010206787198U CN201913763U (en) 2010-12-24 2010-12-24 Precision die for duplicate gears with small spiral angles

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CN201913763U true CN201913763U (en) 2011-08-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102101350A (en) * 2010-12-24 2011-06-22 宁波双林模具有限公司 Precision mold for small-spiral-angle duplex gear
CN105500630A (en) * 2016-02-24 2016-04-20 厦门精卫模具有限公司 Die capable of injection molding plastic part with outer thread and bevel gear
CN106626259A (en) * 2017-01-12 2017-05-10 常州工学院 Injection molding die of equal-diameter both-way plastic helical gear
CN108044324A (en) * 2017-12-17 2018-05-18 江苏威鹰机械有限公司 Automatic gearbox sun gear manufacturing process and its cold forging Extruding die
CN108262920A (en) * 2018-01-23 2018-07-10 湖北工业大学 The combinatory core and injection mold of moulding plastics gear

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102101350A (en) * 2010-12-24 2011-06-22 宁波双林模具有限公司 Precision mold for small-spiral-angle duplex gear
CN102101350B (en) * 2010-12-24 2013-06-26 宁波双林模具有限公司 Precision mold for small-spiral-angle duplex gear
CN105500630A (en) * 2016-02-24 2016-04-20 厦门精卫模具有限公司 Die capable of injection molding plastic part with outer thread and bevel gear
CN105500630B (en) * 2016-02-24 2017-08-01 厦门精卫模具有限公司 It is a kind of to be molded simultaneous with external screw thread and the mould of helical gear plastic cement part
CN106626259A (en) * 2017-01-12 2017-05-10 常州工学院 Injection molding die of equal-diameter both-way plastic helical gear
CN108044324A (en) * 2017-12-17 2018-05-18 江苏威鹰机械有限公司 Automatic gearbox sun gear manufacturing process and its cold forging Extruding die
CN108262920A (en) * 2018-01-23 2018-07-10 湖北工业大学 The combinatory core and injection mold of moulding plastics gear

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RGAV Abandon patent right to avoid regrant
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Granted publication date: 20110803

Effective date of abandoning: 20130626