CN102350475A - Material overlapping and cold precision forging technique for straight toothed spur gear - Google Patents
Material overlapping and cold precision forging technique for straight toothed spur gear Download PDFInfo
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- CN102350475A CN102350475A CN2011102590175A CN201110259017A CN102350475A CN 102350475 A CN102350475 A CN 102350475A CN 2011102590175 A CN2011102590175 A CN 2011102590175A CN 201110259017 A CN201110259017 A CN 201110259017A CN 102350475 A CN102350475 A CN 102350475A
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Abstract
The invention discloses a material overlapping and cold precision forging technique for a straight toothed spur gear, which comprises the steps of: 1) putting two pieces of cylindrical blanks with the same volume in a circular female die along the axial lines thereof in an overlapping manner, overlapping the cylindrical blanks, and primarily extruding the cylindrical blanks; 2) stopping extrusion and taking out the cylindrical blanks if the joining surface of the two cylindrical blanks and the female die is larger than 1/2 of the blank height; 3) exchanging the upper and the lower positions of the two blanks, overlapping the blanks and extruding the blanks again; 4) stopping the extrusion operation if the two blanks are fully joined with the female die and if the tooth forms are fulfilled; and 5) leveling the parts extruded for twice to obtain a final workpiece. The technical can be used for fully filling the material overlapping corner of the straight toothed spur gear under a low extrusion force so that qualified parts are successfully formed by pressing; and the invention has the advantages of forming easiness, filling completeness, simple and reliable mould structure and long service life.
Description
Technical field
The invention belongs to the cold closed-die forging technology in the machine industry, particularly a kind of folded material forging that is applicable to that straight spur gear is produced.
Background technology
Current, straight spur gear is used maximum processing technologys and is still traditional cutting technology, uses forging blank or bar; Through car, mill and heat treatment subsequently finally is shaped, this processes is long man-hour, production efficiency is low; Waste of material is bigger, and it is more to consume energy, and its economic and social benefit is all relatively poor; And the material fiber with toothed section in working angles cuts off the intensity and the service life of having reduced gear.
Along with developing rapidly of industry, the gear part that is used for automobile and aircraft industry requires weight reduction and gains in strength, because the needs of competition also require to reduce cost, the processing of gear finish forge adapts to a kind of technology of this demand just simultaneously.Compare with traditional cutting technology, the gear forging can improve the structure property of gear, has improved the service life of gear, produces the efficient height, and stock utilization is high, and is good in economic efficiency.
For the less gear of straight spur gear especially ratio of height to diameter, profile of tooth during owing to finish forge (corner place particularly) filling difficulty finally causes corner place insufficient fill; The concave die cavity wall will bear very big pressure simultaneously; And there is the stress of height to concentrate, cause the die cracking easily, so the straight spur gear precision forging is tired more much more difficult than bevel gear; Still being in technology at present and exploring and the laboratory research stage, is one of focus of forging technology research both at home and abroad in recent years.
Summary of the invention
The folded material forging that the purpose of this invention is to provide a kind of straight spur gear; This technology is to the difficult point of straight spur gear cold closed-die forging insufficient fill, adopts that two blank deads in line are superimposed up and down carries out twice extruding, can under much little extruding force, successfully suppress qualified parts; Have and be shaped easily; Advantages such as filling is satisfactory, and extruding force is little, and simple and reliable and life-span of mould structure is long.
The objective of the invention is to realize through following technical proposals.
A kind of folded material cold precision forging technology of straight spur gear, this technology comprises the steps:
1) the long-pending identical cylinder blank of two blocks is placed circular die along its dead in line, and two cylinder blank inner faces contacts are carried out superimposed, push for the first time then; At this moment near the material circular die of will at first the fitting end face that contacts with each other of blank, it is intact that type is filled at profile of tooth corner place;
2) when two cylinder blanks and circular die binding face during, stop extruding, two blank are taken out greater than 1/2 blank height;
3) then two blank upper-lower positions are exchanged, put into circular die again, be superimposed with each other with the blank face that following backform pressure head contacts, push once more through last backform;
4) when two blank and circular die is fully fitted, the profile of tooth filling satisfactory after, stop the extruding;
5) will flatten through the part after twice extruding after, promptly get final workpiece.
Further aspect of the present invention is:
The starting stage of said first crimp, being full of the required stress of corner is the yield stress that blank gets into the surrender stage.
The starting stage of said crimp once more is full of the yield stress that the required stress of corner is a bit larger tham first extruding, the yield stress when pushing less than thin material after the sclerosis.
The cold precision forging technology of straight spur gear of the present invention is carried out the contact of two cylinder blank dead in line end faces superimposed, pushes for the first time then, and at this moment material will paste mould earlier near the end face that contacts with each other of blank, and it is intact that type is filled at profile of tooth corner place; After the exchange of two blank upper-lower positions; The end face that is not badly deformed that two blanks originally contacted with the mould pressure head contacts with each other superimposed; The end face that fully had been out of shape in the middle part of originally being in contacts with the mould pressure head; Push once more, the part that is not badly deformed will fully be out of shape, and so just can obtain the satisfactory part of complete filling; The part that the profile of tooth filling is satisfactory flattens and obtains final workpiece.The essence of this technology is that extrusion molding is carried out at the position that the corner position that is difficult to filling can be with common cold extrusion the time is transformed into easy deformation, can under much lower pressure, make the filling of flank profil position complete.
The process that the present invention proposes has following advantage:
1, the flank profil filling is satisfactory.Adopt twice extruding, solved the flank profil corner place difficult problem of filling fully dexterously.
2, resistance of deformation is little, is shaped easily.Because twice extruding all needn't be because of filling corner place intensified pressure, the yield stress when making deformational stress in the whole technology than common extruding or thin material extruding after the sclerosis is little many.
3, mould structure is simple, and the life-span is long.Do not need the idio-morphosis control procedure, only need the simplest deformation process, so mould structure is simple, cost of manufacture is low.
4, process is simple, need not the heating power consumption.Only use prevailing extrusion process, and need not temperature, hot extrusion and also can satisfactoryly fill type, energy-conserving and environment-protective.
Description of drawings
Fig. 1 is the position of blank in mould before the first extruding;
Form when Fig. 2 pushes for blank for the first time;
Fig. 3 is that two blank upper-lower positions exchange the form of back in mould;
Fig. 4 is the final form of blank after the secondary extrusion, and the flank profil filling is complete;
Fig. 5 is the closed state of preceding two blank of first extruding;
Fig. 6 is the shape of first extruding back two blank;
Fig. 7 is that two blank upper-lower positions exchanged the back closed state after first extruding was accomplished;
After Fig. 8 is transposition, the form of blank during through secondary extrusion.
Among the figure: 1, circular die; 2, go up backform; 3, following backform.
The specific embodiment
Below in conjunction with specific embodiment the present invention is done further explanation.
The folded material cold precision forging technology of this straight spur gear comprises the steps:
1) at room temperature, the long-pending identical cylinder blank of two blocks is placed circular die 1 along its dead in line, as shown in Figure 5; And carry out two cylinder blank inner face contacts superimposed; Push for the first time then; As shown in Figure 6, the starting stage of first crimp, being full of the required stress of corner is the yield stress that blank gets into the surrender stage; At this moment near the material circular die 1 of will at first the fitting end face that contacts with each other of blank, it is intact that type is filled at profile of tooth corner place;
2) when two cylinder blanks and circular die 1 binding face during, stop extruding, two blank are taken out greater than 1/2 blank height;
3) then two blank upper-lower positions are exchanged, put into circular die 1 again, be superimposed with each other with the blank face that following backform 3 pressure heads contact through last backform 2, as shown in Figure 7, push once more; Once more the starting stage of crimp, be full of the yield stress that the required stress of corner is a bit larger tham first extruding, the yield stress when pushing after the sclerosis less than thin material.
4) when two blank and circular die is fully fitted, the profile of tooth filling satisfactory after, stop the extruding;
5) will flatten through the part after twice extruding after, promptly get final workpiece.
The present invention is more or less the same when extruding force is with first extruding once more; Blank also will experience with first extrusion type like deformation process; The material at small end face place is easy to outwards bloat, and makes the corner place filling of underfill satisfactory, as shown in Figure 8 once more. obtain two qualified parts through twice extruding like this.
The technological principle that the present invention pushes the cold precision forging that realizes straight spur gear through two blank that superpose is: with two onesize blank A, B superimposed after, see Fig. 1, apply distortion to a certain degree; This moment, the deformation process of two blank was the same (diameter that is this independent material is the same with two blank, and highly is the twice of every blank) with an independent material, was cydariform from the middle part earlier and outwards bloated; See Fig. 2, the top of the bottom of a just top material and a following material outwards bloats simultaneously, and the outer surface that under lower pressure, bloats is adjacent to mould; So original when extruding thin material not place's corner of simple filler just be easy to form satisfactory flank profil, take out blank then, two material upper-lower positions are being exchanged (or not change place and blank upset); See Fig. 3; Put into mould once more and exert pressure, the deformation process that the middle part bloats takes place once more, make another place's corner of blank also be full of die cavity fully; Accomplish whole forming process, see Fig. 4.The key point of this technology is to utilize folded material extruding to make position that the corner position of easy deformation least is transformed into easy deformation with the filling of smooth completion flank profil.
The present invention is identical with common extruding on efficient, and maximum pressure then descends about more than 30% than common extrusion process; The part that obtains can reach 8 class precisions.Because of not needing heats forged; Also needn't fill type fully with what very powerful forcing press can be realized straight spur gear, mould therefor is the ordinary construction mould, and is simple and reliability is high; Easy to manufacture and long service life makes this technology have advantages such as simple, reliable, energy-conservation.
Claims (3)
1. the folded material cold precision forging technology of a straight spur gear is characterized in that this technology comprises the steps:
1) the long-pending identical cylinder blank of two blocks is placed circular die (1) along its dead in line, and two cylinder blank inner faces contacts are carried out superimposed, push for the first time then;
2) when two cylinder blanks and circular die (1) binding face during, stop extruding, two blank are taken out greater than 1/2 blank height;
3) then two blank upper-lower positions are exchanged, put into circular die (1) again, be superimposed with each other with the blank face that following backform (3) pressure head contacts, push once more through last backform (2);
4) when two blank and circular die (1) are fully fitted, the profile of tooth filling satisfactory after, stop extruding;
5) will flatten through the part after twice extruding after, promptly get final workpiece.
2. the folded material cold precision forging technology of a kind of straight spur gear according to claim 1 is characterized in that, the starting stage of said first crimp, being full of the required stress of corner is the yield stress that blank gets into the surrender stage.
3. the folded material cold precision forging technology of a kind of straight spur gear according to claim 1; It is characterized in that; The starting stage of said crimp once more, be full of the yield stress of the required stress of corner, the yield stress when pushing after the sclerosis less than thin material greater than first extruding.
Priority Applications (1)
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CN 201110259017 CN102350475B (en) | 2011-09-02 | 2011-09-02 | Material overlapping and cold precision forging technique for straight toothed spur gear |
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CN 201110259017 CN102350475B (en) | 2011-09-02 | 2011-09-02 | Material overlapping and cold precision forging technique for straight toothed spur gear |
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CN102350475A true CN102350475A (en) | 2012-02-15 |
CN102350475B CN102350475B (en) | 2013-07-10 |
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CN 201110259017 Expired - Fee Related CN102350475B (en) | 2011-09-02 | 2011-09-02 | Material overlapping and cold precision forging technique for straight toothed spur gear |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107160119A (en) * | 2017-07-12 | 2017-09-15 | 安徽凯密克企业管理咨询有限公司 | A kind of Cold Precision Forging of Bevel Gears Used in Car technique |
CN107344190A (en) * | 2017-07-26 | 2017-11-14 | 南通苏通人防防护设备有限公司 | A kind of manufacture method of closed guard gate's steel plate |
CN114589211A (en) * | 2020-12-07 | 2022-06-07 | 河南平高电气股份有限公司 | Spring seat extrusion die |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0085388A1 (en) * | 1982-02-02 | 1983-08-10 | MOTOMAK Motorenbau, Maschinen- und Werkzeugfabrik, Konstruktionen GmbH | Method of making a metal socket starting from a cylindrical tubular piece |
US4433568A (en) * | 1980-05-21 | 1984-02-28 | Kabushiki Kaisha Wako | Precision closed-die forging method |
SU1428521A1 (en) * | 1986-06-09 | 1988-10-07 | Предприятие П/Я А-3759 | Arrangement for all-round reduction |
CN1102144A (en) * | 1993-10-26 | 1995-05-03 | 青岛建筑工程学院 | Spur gear precision die stamping-push-press forming process and its equipment |
CN1868633A (en) * | 2005-05-27 | 2006-11-29 | 河南科技大学 | Shaping method of straight teeth cylindrical gear wheel |
CN201815618U (en) * | 2009-09-05 | 2011-05-04 | 杨其融 | Precision forging die capable of forging tooth form of straight toothed spur gear |
-
2011
- 2011-09-02 CN CN 201110259017 patent/CN102350475B/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4433568A (en) * | 1980-05-21 | 1984-02-28 | Kabushiki Kaisha Wako | Precision closed-die forging method |
EP0085388A1 (en) * | 1982-02-02 | 1983-08-10 | MOTOMAK Motorenbau, Maschinen- und Werkzeugfabrik, Konstruktionen GmbH | Method of making a metal socket starting from a cylindrical tubular piece |
SU1428521A1 (en) * | 1986-06-09 | 1988-10-07 | Предприятие П/Я А-3759 | Arrangement for all-round reduction |
CN1102144A (en) * | 1993-10-26 | 1995-05-03 | 青岛建筑工程学院 | Spur gear precision die stamping-push-press forming process and its equipment |
CN1868633A (en) * | 2005-05-27 | 2006-11-29 | 河南科技大学 | Shaping method of straight teeth cylindrical gear wheel |
CN201815618U (en) * | 2009-09-05 | 2011-05-04 | 杨其融 | Precision forging die capable of forging tooth form of straight toothed spur gear |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107160119A (en) * | 2017-07-12 | 2017-09-15 | 安徽凯密克企业管理咨询有限公司 | A kind of Cold Precision Forging of Bevel Gears Used in Car technique |
CN107344190A (en) * | 2017-07-26 | 2017-11-14 | 南通苏通人防防护设备有限公司 | A kind of manufacture method of closed guard gate's steel plate |
CN114589211A (en) * | 2020-12-07 | 2022-06-07 | 河南平高电气股份有限公司 | Spring seat extrusion die |
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CN102350475B (en) | 2013-07-10 |
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