CN102059267B - Inside screw cylindrical gear rotary cold extruding die - Google Patents

Inside screw cylindrical gear rotary cold extruding die Download PDF

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Publication number
CN102059267B
CN102059267B CN201010555775A CN201010555775A CN102059267B CN 102059267 B CN102059267 B CN 102059267B CN 201010555775 A CN201010555775 A CN 201010555775A CN 201010555775 A CN201010555775 A CN 201010555775A CN 102059267 B CN102059267 B CN 102059267B
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CN
China
Prior art keywords
die
punch
bolster
centring ring
roller gear
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CN201010555775A
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Chinese (zh)
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CN102059267A (en
Inventor
赵震
吴公明
庄新村
向华
李宏烨
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上海交通大学
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Priority to CN201010555775A priority Critical patent/CN102059267B/en
Publication of CN102059267A publication Critical patent/CN102059267A/en
Application granted granted Critical
Publication of CN102059267B publication Critical patent/CN102059267B/en

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Abstract

The invention discloses an inside screw cylindrical gear rotary cold extruding die in the technical field of gear machining, which comprises an upper die structure and a lower die structure, wherein the upper die structure comprises a terrace die, a terrace die positioning ring, a terrace die fixing ring, a terrace die base, a terrace die upper padding plate, a thrusting bearing and an upper die base; and the lower die structure comprises a discharging plate, a cavity die, a cavity die positioning ring, a cavity die lower padding plate, a limit block, a mandril sleeve, a mandril and a lower die base. The inside screw cylindrical gear rotary cold extruding die is convenient for production and operation and is beneficial to cost saving; and the defects in the traditional mechanical cutting method and the traditional hobbing method are improved, and the production efficiency, the material utilization rate and the product accuracy can be improved simultaneously.

Description

Inside spin roller gear rotation cold extrusion die

Technical field

What the present invention relates to is the device in a kind of gear machining technology field, specifically is a kind of inside spin roller gear rotation cold extrusion die.

Background technology

Helix cylindrical gear has purposes widely, can be used for the supporting demand of high-power electric instrument and other transmission component.When inside spin roller gear structure was used for transmission mechanism, its profile of tooth contact-ratio was more than the twice of common spur gear, and it is smooth-going to turn round in the work, and noise is little, and helix cylindrical gear also possesses the characteristic of high output torque and low back clearance simultaneously.

The existing processing method of inside spin roller gear is mainly machine cut processing, as adopting turning processing or milling-tapping machine interior milling head processing is installed, and difficulty of processing is big, cost is high, production efficiency is low, and stock utilization is not high.Because cut can produce " the profile of tooth calibration is uneven " this major defect, cut can cause metallic fiber to be cut off simultaneously, so that the reduction of the intensity of the inside spin roller gear that processes, and shorten service life.

Except that cut, also adopt hobbing method processing inside spin roller gear sometimes, obtain the base material after promptly adopting the powder metallurgy repressing and re-sintering, process through gear hobbing technology again.But gear hobbing processing gained part profile accuracy and mechanical performance are relatively poor, and uniformity is poor in batches, are not suitable for producing in enormous quantities.

Retrieval through to prior art is found; The someone adopts the method for extrusion forging to produce helix cylindrical gear in recent years; B.A.BehrenS; E.Doege etc. adopt complete closed molds hot extrusion forging and molding helix cylindrical gear, see B.A.Behrens, E.Doege et.; Precision forging processes for high-duty automotive components (precision forging technology in the high-strength automotive part production), Journal of Materials Processing Technology Vol.185 (2007): 139-146; S.Y.Jung; M.C.Kang etc. adopt two molds earlier with blank cold-extrusion shaping spur gear, again the spur gear that is shaped are swaged into helical gear, see S.Y.Jung; M.C.Kang et.; A Study on the Extrusion by a two-step process formanufacturing helical gear (based on the research of two-step method extrusion production helical gear), Int J Adv Manuf Technol, Vol.41 (2009): 684-693.Said method all adopts closed molds to forge, and forging force is big, and die life is low, and the external spiral gear that is only applicable to be shaped, and about extrusion forging shaping inside spin roller gear, does not also have the open source literature report at present.

Summary of the invention

The present invention is directed to the above-mentioned deficiency that prior art exists, a kind of inside spin roller gear rotation cold extrusion die is provided, the cold extrusion forging method is applied to the production of inside spin roller gear; Not only improve the deficiency that existing machinery cutting process and hobbing method exist, and solved general closed molds forging, the problem that forging force is big of adopting; Prolonged die life; Be convenient to production operation, be beneficial to cost savings, can enhance productivity simultaneously, stock utilization and product precision.

The present invention realizes through following technical scheme, the present invention includes: go up mode structure and following mode structure, wherein:

Last mode structure comprises: punch, punch centring ring, punch retainer plate, convex mould base, punch upper padding plate, thrust bearing and upper bolster; Wherein: the socket successively from outside to inside of punch centring ring, punch retainer plate, punch; Punch centring ring and punch adopt matched in clearance; Punch centring ring and punch retainer plate adopt interference fit, realize inside spin profile of tooth part extruding rotary forming and rotation discharging through the punch rotation, and thrust bearing is arranged in the punch centring ring and with the punch upper end and is connected; Punch centring ring and punch upper padding plate are individually fixed in the convex mould base, and convex mould base is fixedly connected with upper bolster;

Following mode structure comprises: stripper, die, die centring ring, die lower bolster adjustable plate, die lower bolster, limited block, push rod and sleeve, push rod and die shoe; Wherein: stripper is movably set in the die shoe top; Die lower bolster adjustable plate, die lower bolster, limited block and die from bottom to top are arranged in the die centring ring successively; The die centring ring is fixed in the die shoe, and push rod is arranged to be fixed in the push rod and sleeve in the die shoe and with die lower bolster adjustable plate and contacts.

Described punch is the cone that the stairstepping diameter from top to bottom reduces gradually, and as the mandrel of extrusion billet, adjacent with mandrel is the working portion of punch, is processed into screw serrated form in forming process on the top of punch.

Described die both sides are provided with ball bearing; Adopt interference fit between ball bearing and the die, adopt matched in clearance between ball bearing and the die lower bolster, guarantee that the extrusion process die can rotate; Effectively reduce the resistance in the extrusion process, avoid the punch profile of tooth to be damaged.

The center of described die and die lower bolster has through hole and is provided with kicker, and this kicker is a stepped ramp type cylindrical structure, and its center is provided with the through hole identical with the pre-punched hole diameter of extrusion billet.

Vertical some groups of guide pillars, guide pin bushing, spring guide and the discharge arm screw of being provided with between described upper bolster, stripper and the die shoe is to realize the relative motion between the three.

Operation principle of the present invention is: the extrusion billet outside is because the extruding force effect is close to the die inwall, if adopt the non-rotating die, process can produce huge frictional resistance.For reducing the moment of torsion that produces because of frictional resistance; In the mould design, fastening-type punch common, that do not possess spinfunction, die all are placed among the swivel bearing; The metal helical flow that makes progress when being squeezed; The moment of torsion that produces can drive punch, die and in bearing, produce servo rotation, thereby the rotational resistance that flow metal and punch, die are born is reduced to minimum, can shear fracture not take place because of receiving powerful friction torque with the metal that guarantees helical flow.

When adopting mould of the present invention to carry out inside spin roller gear part forming, because the metal spiral flow direction upwards, main torsional interaction is on punch.Support with thrust bearing in the punch upper surface, punch and bearing rotate under twisting force.At this moment, punch is main rotation, and die is the servo-actuated rotation.For guaranteeing that the rotation cold-stamped implements, must make moment of friction MF as far as possible little, turning moment MR can overcome friction square MF, thereby guarantees to produce in the extrusion process rotation that cooperates of workpiece material and punch, die.

The present invention has adopted cold-extrusion shaping to substitute cut, and metal streamline is complete, has improved the intensity and the comprehensive mechanical performance of gear, has increased the transmission capacity of moment of torsion, has improved the bearing capacity and the service life of gear.With respect to prior art, adopt mould of the present invention to carry out the processing of internal helical gear part, can enhance productivity, reduce production costs, promote product quality and life-span.

Description of drawings

Fig. 1 is an overall structure sketch map of the present invention;

Fig. 2 is the punch part drawing of band screw serrated form;

Fig. 3 is the inside spin roller gear part drawing after processing;

Fig. 4 is a counterdie master workspace installation process sketch map.

The specific embodiment

Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.

As shown in Figure 1, present embodiment comprises: go up mode structure and following mode structure, wherein:

Last mode structure comprises:

Critical pieces such as upper bolster 10, punch centring ring 11, punch retainer plate 12, punch 13, punch upper padding plate 14, thrust bearing 15, convex mould base 16.Wherein punch centring ring 11, punch retainer plate 12, punch 13 socket successively from outside to inside; Thrust bearing 15 is arranged in the punch centring ring 11 and with punch 13 upper ends and is connected; Punch centring ring 11 is individually fixed in the convex mould base 16 with punch upper padding plate 14, and convex mould base 16 is fixedly connected with upper bolster 10;

Following mode structure comprises:

Critical pieces such as die shoe 1, discharge arm screw 2, die lower bolster adjustable plate 3, die lower bolster 4, limited block 5, stripper 6, guide pin bushing 7, stripper insert 8, guide pillar 9, extrusion billet 17, die 18, die cover plate 19, kicker 20, spring guide 21, spring 22, ball bearing 23, die centring ring 24, push rod and sleeve 25, push rod 26.Wherein stripper 6 is movably set in die shoe 1 top; Die lower bolster adjustable plate 3, die lower bolster 4, limited block 5 and die 18 from bottom to top are arranged in the die centring ring 24 successively; Die centring ring 24 is fixed in the die shoe 1; Push rod 26 is arranged in the push rod and sleeve 25 and is fixed in the die shoe 1, is supporting die lower bolster adjustable plate 3, and extrusion billet 17 is the products material in the implementation process.

Present embodiment carries out installment work in the following manner:

At first, extrusion billet 17 is placed in the die 18.Die 18 peripheries are with die centring ring 24 and die cover plate 19, and the bottom is lined with die lower bolster 4 and die backing plate adjustment plate 3, cooperates ball bearing 23 can realize rotating in a circumferential direction.Matched in clearance between die cover plate 19 and the ball bearing 23 guarantees through limited block 5, avoids ball bearing 23 in forming process, to be damaged.The placement of extrusion billet 17 in die 18 highly relies on kicker 20 and push rod 26 to control.Like special circumstances, can adopt kicker 20 and push rod 26 that extrusion billet 17 is taken out.

Subsequently, the upper bolster 10 that is fixed on press upper table face moves downward under the press slide effect, drives punch 13 and moves downward.The outer working face of punch 13 has screw serrated form, and is as shown in Figure 2.When it moves downward, be fixed on the upper bolster 10 through the acting in conjunction of convex mould base 16, punch retainer plate 12, punch centring ring 11, punch upper padding plate 14 and thrust bearing 15.Upper bolster 10 moves downward in the process, and spring 22 compresses down in the acting in conjunction of spring guide 21 and stripper 6, and stripper 6, stripper insert 8 and the 2 generation relative motions of discharge arm screw.

When punch 13 be placed on extrusion billet 17 in four moulds 18 when coming in contact; Whole extrusion process begins to carry out; Be that punch 13 continues to move down, extrusion billet 17 makes progress under the effect of backward extrusion power and flows, and acts on place, the punch 13 work zones torsion that screw serrated form produced drive punch 13 simultaneously and in thrust bearing 15 and ball bearing 23, automatically produces rotation with die 18; Until the inside spin roller gear 27 of the desired height that is shaped, as shown in Figure 3.

Be shaped after the completion, stripper 6 resets under the acting in conjunction of spring guide 21, spring 22 and discharge arm screw 2.

Counterdie master workspace 31 complex structures of this mould, installation process will be carried out according to certain order, and is as shown in Figure 4.At first push rod and sleeve 25 and push rod 26 are combined as compound push rod 27, together are placed into die shoe 1 inside, form compound die shoe 28.Meanwhile, die lower bolster adjustable plate 3 and die lower bolster 4 are mounted in the die retainer plate 24, form combined die annex 29.Kicker 20 is put into combined die annex 29 subsequently, and combines with compound die shoe 28, forms compound die annex 30.Ball bearing 23, die 18, limited block 5 and die cover plate 19 are installed at last successively, are about to counterdie master workspace 31 and install.

Claims (5)

1. an inside spin roller gear rotates cold extrusion die, and this mould comprises mode structure and following mode structure, it is characterized in that:
Last mode structure comprises: punch, punch centring ring, punch retainer plate, convex mould base, punch upper padding plate, thrust bearing and upper bolster; Wherein: the socket successively from outside to inside of punch centring ring, punch retainer plate, punch; Punch retainer plate and punch adopt matched in clearance; Punch centring ring and punch retainer plate adopt interference fit, realize inside spin roller gear extruding rotary forming and rotation discharging through the punch rotation, and thrust bearing is arranged in the punch centring ring and with the punch upper end and is connected; Punch centring ring and punch upper padding plate are individually fixed in the convex mould base, and convex mould base is fixedly connected with upper bolster;
Following mode structure comprises: stripper, die, die centring ring, die lower bolster adjustable plate, die lower bolster, limited block, push rod and sleeve, push rod and die shoe; Wherein: stripper is movably set in the die shoe top; Die lower bolster adjustable plate, die lower bolster, limited block and die from bottom to top are arranged in the die centring ring successively; The die centring ring is fixed in the die shoe, and push rod is arranged to be fixed in the push rod and sleeve in the die shoe and with die lower bolster adjustable plate and contacts.
2. inside spin roller gear rotation cold extrusion die according to claim 1 is characterized in that described punch is the cone that the stairstepping diameter reduces gradually from top to bottom.
3. inside spin roller gear rotation cold extrusion die according to claim 1 is characterized in that described die both sides are provided with ball bearing, adopt interference fit between ball bearing and the die, adopts matched in clearance between ball bearing and the die lower bolster.
4. inside spin roller gear rotation cold extrusion die according to claim 1; It is characterized in that; The center of described die and die lower bolster has through hole and is provided with kicker; This kicker is a stepped ramp type cylindrical structure, and its center is provided with the through hole identical with the pre-punched hole diameter of extrusion billet.
5. inside spin roller gear rotation cold extrusion die according to claim 1; It is characterized in that; Vertical some groups of guide pillars, guide pin bushing, spring guide and the discharge arm screw of being provided with between described upper bolster, stripper and the die shoe is to realize the relative motion between the three.
CN201010555775A 2010-11-24 2010-11-24 Inside screw cylindrical gear rotary cold extruding die CN102059267B (en)

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CN201010555775A CN102059267B (en) 2010-11-24 2010-11-24 Inside screw cylindrical gear rotary cold extruding die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201010555775A CN102059267B (en) 2010-11-24 2010-11-24 Inside screw cylindrical gear rotary cold extruding die

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CN102059267B true CN102059267B (en) 2012-09-05

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102601146A (en) * 2012-03-07 2012-07-25 四川绵阳重业齿轮有限责任公司 Cold extrusion die for spur gear
CN103464498A (en) * 2012-06-06 2013-12-25 镇江建华轴承有限公司 Precise processing method for specially-shaped cavity of bearing outer ring
CN102921794B (en) * 2012-11-05 2015-05-20 无锡市亚青机械厂 Blanking die structure of bending press hood
CN106862299B (en) * 2015-12-11 2020-06-19 南京理工大学 Single-process processing method of multilayer metal composite material
CN106001361A (en) * 2016-06-30 2016-10-12 太仓市顺昌锻造有限公司 Forging die
CN106623469A (en) * 2016-11-11 2017-05-10 南京理工大学 Hot extrusion die and technique for thin-wall deep aluminum alloy cartridge piece
CN107685116A (en) * 2017-10-25 2018-02-13 苏州华丰不锈钢紧固件有限公司 A kind of one time punching molded device of bolt
CN108015118A (en) * 2018-01-29 2018-05-11 安徽新悦精密机械有限公司 A kind of cold extrusion shaped mould structure of wire rod
CN108714631B (en) * 2018-05-17 2020-12-01 北京科技大学 Twisting-extruding composite plastic deformation forming method and process device
CN109772919A (en) * 2018-12-19 2019-05-21 河南平高电气股份有限公司 A kind of extrusion die

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2460237Y (en) * 2000-12-26 2001-11-21 武金有 Cold-temp. extruding profiling die of internal-external circul helical gear
DE102007016893A1 (en) * 2006-04-12 2007-12-27 GM Global Technology Operations, Inc., Detroit Method and device for finishing an article
CN101712062A (en) * 2009-11-05 2010-05-26 郑州机械研究所 Plastic precise forming process and device of internal bevel gear or spiral involute internal spline

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Publication number Priority date Publication date Assignee Title
US8061174B2 (en) * 2008-10-03 2011-11-22 Ford Global Technologies, Llc Preventing voids in extruded teeth or splines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2460237Y (en) * 2000-12-26 2001-11-21 武金有 Cold-temp. extruding profiling die of internal-external circul helical gear
DE102007016893A1 (en) * 2006-04-12 2007-12-27 GM Global Technology Operations, Inc., Detroit Method and device for finishing an article
CN101712062A (en) * 2009-11-05 2010-05-26 郑州机械研究所 Plastic precise forming process and device of internal bevel gear or spiral involute internal spline

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Owner name: SHANGHAI MOULD TECHNOLOGY RESEARCH INSTITUTE CO.,

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Address before: 200240 Dongchuan Road, Shanghai, No. 800, No.

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