CN108435912B - Cylindrical helical gear twisting and pressing forming die and forming method thereof - Google Patents
Cylindrical helical gear twisting and pressing forming die and forming method thereof Download PDFInfo
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- CN108435912B CN108435912B CN201810188893.5A CN201810188893A CN108435912B CN 108435912 B CN108435912 B CN 108435912B CN 201810188893 A CN201810188893 A CN 201810188893A CN 108435912 B CN108435912 B CN 108435912B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/02—Ejecting devices
- B21D45/04—Ejecting devices interrelated with motion of tool
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
- B21D53/28—Making other particular articles wheels or the like gear wheels
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a cylindrical helical gear twisting and pressing forming die and a forming method thereof, wherein the forming die comprises an upper male die, a sleeve, a female die and a lower male die, the upper male die is in a stepped shaft shape and comprises an upper male die fixing part and a gear pressing part, the sleeve is arranged below the upper male die, the gear pressing part is inserted into the sleeve and has freedom degree of moving up and down along the inner wall of the sleeve, the female die is arranged below the sleeve in parallel, a through hole matched with the inner diameter of the sleeve is formed in the middle of the female die along the thickness direction, a tooth-shaped spiral groove is formed in the hole wall of the through hole, the lower male die is inserted into the through hole from the lower part of the female die along the tooth-shaped spiral groove in a matching manner, and a cylindrical. The forming method comprises the steps of realizing torsional pressing forming by using a torsional pressing forming machine and the like. The invention has simple structure and convenient operation, can ensure that the cylindrical helical gear has better forming effect, and has the advantages of convenient automatic demoulding and high demoulding efficiency.
Description
Technical Field
The invention relates to the technical field of dies, in particular to a cylindrical helical gear twisting and pressing forming die and a forming method thereof.
Background
The plastic forming of the cylindrical helical gear is a helical gear forming method superior to the traditional mechanical processing, and the helical gear after the plastic forming has the advantages of complete metal streamline, strong anti-fatigue life of the gear, high material utilization rate and the like. However, the cylindrical helical gear can be formed by adopting the traditional plastic forming method because the tooth profile of the cylindrical helical gear has a helical angle, but the cylindrical helical gear is inconvenient to demould and is forced to eject, so that the gear and a die are greatly damaged, and the demoulding problem becomes the biggest bottleneck of the plastic forming of the cylindrical helical gear.
In some documents, the cylindrical helical gear is formed by using a split combined die, which solves the difficult problem of die stripping, but has the following two difficulties: 1. by adopting the petal-combined structure, the cylindrical helical gear is easy to generate burrs at the petal-combined position, and the burrs need to be polished and cleaned after being demoulded; 2. after each forming, the mold is required to be opened to take out the cylindrical helical gear, and then the cylindrical helical gear is assembled to be processed and formed next time, so that the production efficiency of enterprises is seriously influenced. Therefore, how to design a processing method capable of both plastically forming the cylindrical helical gear and meeting the requirement of high-efficiency production of enterprises has become an important research topic at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cylindrical helical gear twisting and pressing forming die and a forming method thereof, which can enable the demoulding of the cylindrical helical gear to be more convenient on the premise of ensuring the forming effect of the cylindrical helical gear.
The utility model provides a cylinder helical gear twists and presses forming die, including last terrace die, the sleeve, die and lower terrace die, it is the step shaft form to go up the terrace die, including last terrace die fixed part and gear pressing portion, the diameter of going up the terrace die fixed part is greater than gear pressing portion, the sleeve sets up the below at last terrace die, gear pressing portion inserts in the sleeve and has the degree of freedom that reciprocates along the sleeve inner wall, die parallel arrangement is in telescopic below, the through-hole with sleeve internal diameter size looks adaptation is seted up along the thickness direction in the middle part of the die, the profile of tooth helicla flute has been seted up on the pore wall of through-hole, the lower terrace die inserts in the through-hole along the cooperation of profile of tooth helicla flute from the below of die, go up the terrace die.
As a further description of the above technical solution:
and the top surface of the lower male die is provided with a gear restraining groove.
As a further description of the above technical solution:
the cylindrical helical gear twisting and pressing forming die is installed in a twisting and pressing forming machine, the twisting and pressing forming machine comprises a lower pressing workbench and a twisting workbench which are arranged up and down oppositely, an upper male die is installed in the lower pressing workbench, and a lower male die is fixed on the twisting workbench.
A method for forming a cylindrical helical gear by using a twisting and pressing forming die for the cylindrical helical gear comprises the following steps:
(1) installing the upper male die on a lower pressing workbench of a twisting and pressing forming machine, and installing the lower male die on the twisting workbench of the twisting and pressing forming machine;
(2) screwing the female die into the lower male die;
(3) fixing the sleeve on the upper end surface of the female die;
(4) placing the cylindrical blank in a female die;
(5) starting the twisting and pressing forming machine, pressing the upper convex die downwards, and rotating the lower convex die to twist and press the cylindrical blank into the cylindrical helical gear;
(6) the upper male die and the sleeve are lifted, the lower male die rotates reversely, and the formed cylindrical helical gear is ejected;
(7) and taking the material.
Compared with the prior art, the invention has the beneficial effects that:
1. the twisting and pressing forming die for the cylindrical helical gear, provided by the invention, is simple in structure and convenient to operate, can ensure that the cylindrical helical gear has a good forming effect, and has the advantages of convenience in automatic demolding and high demolding efficiency;
2. the torsional pressing forming method provided by the invention is more beneficial to radial filling of the cylindrical helical gear because the axial force and the radial force are simultaneously applied to the blank during forming, and is convenient for complete filling of the corner part of the gear;
3. because the female die is not of a petal structure, no flash is generated around the cylindrical helical gear during forming, the time for removing the flash is saved, and the production efficiency is improved;
4. after the cylindrical helical gear is formed, the lower convex die rotates reversely by utilizing the helical angle of the cylindrical helical gear, so that the cylindrical helical gear is convenient to demould, the operation is convenient, and the demoulding efficiency is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the working principle of the present invention.
Illustration of the drawings:
1. an upper male die; 11. an upper male die fixing part; 12. a gear pressing section; 2. A sleeve; 3. a female die; 31. a through hole; 32. a toothed spiral groove; 33. a gear restraint groove; 4. A lower male die; 5. A cylindrical blank.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
Referring to fig. 1, the cylindrical helical gear twisting and pressing forming die provided by the invention comprises an upper male die 1, a sleeve 2, a female die 3 and a lower male die 4, wherein the upper male die 1 is in a stepped shaft shape and comprises an upper male die fixing part 11 and a gear pressing part 12, the diameter of the upper male die fixing part 11 is larger than that of the gear pressing part 12, the sleeve 2 is arranged below the upper male die 1, the gear pressing part 12 is inserted into the sleeve 2 and has the freedom degree of moving up and down along the inner wall of the sleeve 2, the female die 3 is arranged below the sleeve 2 in parallel, a through hole 31 matched with the inner diameter of the sleeve 2 is formed in the middle of the female die 3 along the thickness direction, a tooth-shaped helical groove 32 is formed in the hole wall of the through hole 31, the lower male die 4 is inserted into the through hole 31 from the lower part of the female die 3 along the tooth-shaped helical gear 32 in a.
With reference to fig. 2, when in use, a cylindrical blank 5 (the diameter of which is slightly smaller than the gear tooth root circle to be formed) is placed in the female die 3, downward pressure is applied to the upper male die 1, and a rotating force is applied to the lower male die 4, and because a matching structure is adopted between the lower male die 4 and the female die 3, the female die 3 and the lower male die 4 run synchronously in the rotating process of the lower male die 4, and the cylindrical blank 5 is compressed along with the gradual downward pressing of the upper male die 1, and is driven along with the rotation of the lower male die 4 and the female die 3, so that the shaping in the tooth-shaped spiral groove 32 is realized, and the cylindrical blank 5 forms a cylindrical helical gear.
After the cylindrical helical gear is formed, the downward pressure applied to the upper male die 1 is removed, the upper male die 1 upwards leaves the female die 3, the sleeve 2 is separated from the female die 3, and at the moment, the lower male die 4 is lifted to drive the formed cylindrical helical gear to be smoothly demoulded.
In this embodiment, the top surface of the lower punch 4 is provided with a gear restraining groove 33. The purpose is to restrain the cylindrical helical gear, so that the lower punch 4 drives the cylindrical helical gear to rotate together when rotating reversely along the tooth-shaped spiral groove 32, and the cylindrical helical gear is ejected out of the female die.
In this embodiment, the cylindrical helical gear twisting and pressing forming die is installed in a twisting and pressing forming machine, the twisting and pressing forming machine comprises a pressing-down workbench and a twisting workbench which are arranged up and down oppositely, an upper male die 1 is installed in the pressing-down workbench, and a lower male die 4 is fixed on the twisting workbench. The purpose is that the automatic processing and manufacturing of the cylindrical helical gear can be more conveniently realized by using the twisting and pressing forming machine to match with the die, and the quality and the precision of the product can also be ensured.
A method for forming a cylindrical helical gear by using a twisting and pressing forming die for the cylindrical helical gear comprises the following steps:
(1) the upper male die 1 is arranged on a lower pressing workbench of a twisting and pressing forming machine, and the lower male die 4 is arranged on the twisting workbench of the twisting and pressing forming machine;
(2) screwing the female die 3 into the lower male die 4;
(3) fixing the sleeve 2 on the upper end surface of the female die 3;
(4) placing the cylindrical blank 5 in the female die 3;
(5) starting the twisting and pressing forming machine, pressing the upper male die 1 downwards, and rotating the lower male die 4 to twist and press the cylindrical blank 5 into a cylindrical helical gear;
(6) the upper male die 1 and the sleeve 2 are lifted, and the lower male die 4 rotates reversely to eject the formed cylindrical helical gear;
(7) and taking the material.
The forming method enables the force of the die on the blank to be decomposed into a radial force and an axial force in the twisting and pressing process of the cylindrical blank 5, the axial force enables the material to move downwards to realize upsetting, the radial force enables the material to flow horizontally, and filling of the corner part of the gear is facilitated. After the gear is formed, the upper male die 1 moves upwards along with the return stroke of the lower pressing workbench of the twisting and forming hydraulic machine, the female die 3 does not move, the lower male die 4 moves upwards along with the reverse rotation of the twisting workbench of the twisting and forming hydraulic machine, and the formed cylindrical helical gear is ejected out of the female die.
The upper male die 1 applies downward pressure F to the blank, the lower male die 4 rotates to apply torque to the blank by utilizing friction force, the forming method is large plastic deformation, crystal grains of the blank can be greatly refined, the strength of a finished piece is improved, meanwhile, the application of the torque is related to the distance from the central axis of the blank, the torque is zero at the central axis of the blank, the torque applied to the outermost side of the blank is the largest, the crystal grains are the smallest, and the strength is the highest. The gear is used as a transmission member, and the strength of teeth positioned on the outer side of the gear is required to be high mainly by the contact transmission force of tooth profiles, so that the special requirement is that the gear is processed by a torsional forming method, and the cylindrical helical gear has a helical angle due to the special shape of the tooth profile, and is not easy to be demoulded after being formed by a traditional plastic forming method, so that the torsional forming method is used for processing the cylindrical helical gear.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (1)
1. A method for forming a cylindrical helical gear uses a twisting and pressing forming die for the cylindrical helical gear, and is characterized in that: the method comprises the following steps:
1) the upper male die (1) is arranged on a lower pressing workbench of the twisting and pressing forming machine, and the lower male die (4) is arranged on the twisting workbench of the twisting and pressing forming machine;
2) screwing the female die (3) into the lower male die (4);
3) fixing the sleeve (2) on the upper end surface of the female die (3);
4) placing the cylindrical blank (5) in the concave die (3);
5) starting the twisting and pressing forming machine, pressing the upper male die (1) downwards, and rotating the lower male die (4) to twist and press the cylindrical blank (5) into a cylindrical helical gear;
6) the upper male die (1) and the sleeve (2) rise, the lower male die (4) rotates reversely, and the formed cylindrical helical gear is ejected;
7) taking materials;
the cylindrical helical gear twisting and pressing forming die comprises an upper male die (1), a sleeve (2), a female die (3) and a lower male die (4), wherein the upper male die (1) is in a stepped shaft shape and comprises an upper male die fixing part (11) and a gear pressing part (12), the diameter of the upper male die fixing part (11) is larger than the gear pressing part (12), the sleeve (2) is arranged below the upper male die (1), the gear pressing part (12) is inserted into the sleeve (2) and has the freedom degree of moving up and down along the inner wall of the sleeve (2), the female die (3) is arranged below the sleeve (2) in parallel, a through hole (31) matched with the inner diameter size of the sleeve (2) is formed in the middle of the female die (3) along the thickness direction, a helical groove (32) is formed in the hole wall of the through hole (31), and the lower tooth form (4) is inserted into the through hole (31) from the lower part of the female die, a cylindrical helical gear twisting and pressing forming cavity is formed among the upper male die (1), the female die (3) and the lower male die (4), a gear restraining groove (33) is formed in the top surface of the lower male die (4), the cylindrical helical gear twisting and pressing forming die is installed in a twisting and pressing forming machine, the twisting and pressing forming machine comprises a lower pressing workbench and a twisting workbench which are arranged up and down oppositely, the upper male die (1) is installed in the lower pressing workbench, and the lower male die (4) is fixed on the twisting workbench.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810188893.5A CN108435912B (en) | 2018-03-08 | 2018-03-08 | Cylindrical helical gear twisting and pressing forming die and forming method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810188893.5A CN108435912B (en) | 2018-03-08 | 2018-03-08 | Cylindrical helical gear twisting and pressing forming die and forming method thereof |
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| Publication Number | Publication Date |
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| CN108435912A CN108435912A (en) | 2018-08-24 |
| CN108435912B true CN108435912B (en) | 2020-06-30 |
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| CN201810188893.5A Active CN108435912B (en) | 2018-03-08 | 2018-03-08 | Cylindrical helical gear twisting and pressing forming die and forming method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114227183B (en) * | 2021-11-04 | 2023-12-08 | 深圳大学 | Preparation method of helical gear forming die |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0685971B2 (en) * | 1990-11-28 | 1994-11-02 | 大岡技研株式会社 | Helical gear formation method |
| JP2698335B2 (en) * | 1995-10-23 | 1998-01-19 | アカマツフォーシス株式会社 | Helical gear manufacturing method and helical gear dice device |
| JP4159063B2 (en) * | 1998-12-25 | 2008-10-01 | アイシン機工株式会社 | Forging equipment |
| JP4228671B2 (en) * | 2002-07-17 | 2009-02-25 | アイシン・エィ・ダブリュ株式会社 | Gear forming apparatus and method |
| PL2208552T5 (en) * | 2009-01-19 | 2014-10-31 | Finova Feinschneidtechnik Gmbh | Method and device for fine cutting of workpieces |
| CN101879536B (en) * | 2010-07-02 | 2012-02-15 | 洛阳理工学院 | Method for forming helical gear by radial cold extrusion and die thereof |
| TWI558482B (en) * | 2014-10-27 | 2016-11-21 | 財團法人金屬工業研究發展中心 | Apparatus for forging bevel gears |
| CN105436390B (en) * | 2015-11-03 | 2017-11-21 | 南昌大学 | Straight/helical teeth cylindricality gear the accurate forming method and mould that a kind of corner is easily full of |
| CN105328097B (en) * | 2015-12-11 | 2017-08-25 | 武汉理工大学 | The method that helix cylindrical gear floating die assembly structure is determined based on speed difference |
| CN208514951U (en) * | 2018-03-08 | 2019-02-19 | 皖西学院 | A kind of cylindric spiral gear twisted multi-leg block mold |
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