CN210188364U - Die for gear precision forging process - Google Patents
Die for gear precision forging process Download PDFInfo
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- CN210188364U CN210188364U CN201921127872.9U CN201921127872U CN210188364U CN 210188364 U CN210188364 U CN 210188364U CN 201921127872 U CN201921127872 U CN 201921127872U CN 210188364 U CN210188364 U CN 210188364U
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Abstract
The utility model discloses a mould for gear precision forging process, which comprises a female mould and an upper mould, wherein the female mould is provided with a cavity, the upper mould is used for forging, a first boss is arranged in the middle of the cavity of the female mould, the first boss is in the shape of a truncated cone, and the tip of the first boss is the top end of the first boss; the lower end of the upper die is also provided with a second boss, the appearance of the second boss is in a cone frustum shape, and the tip end of the second boss is the bottom end of the second boss; during forging, the first boss is coaxial with the second boss. The die can be used for forging gears with larger thickness by adopting the gear precision forging technology.
Description
Technical Field
The utility model relates to a gear machining technical field especially relates to a mould for gear finish forging technology.
Background
At present, the straight toothed spur gear is mainly manufactured by a traditional metal cutting machining method or a method combining hot die forging blank forming with cutting machining, the cutting machining manufacturing method has the problems of low production efficiency, low material utilization rate, damage to the continuity of metal fibers of gear teeth and the like, and the straight toothed spur gear has the defects of poor comprehensive performance, low gear service life and the like.
As described in the technical solution provided in the utility model with application number 201811273204.7, in the prior art, a gear machining process based on forging is provided. It is generally accepted in the industry that machining gears by precision forging (finish forging) can improve material utilization, improve production efficiency, improve mechanical properties of gears, reduce cost and enhance market competitiveness. Especially has greater benefit and potential for mass production and gear precision forging in the automobile industry.
Despite the numerous advantages of gear precision forging and its use in the scale production of bevel gears, there is some distance from the scale production that applies to the sizing of spur and helical gears.
SUMMERY OF THE UTILITY MODEL
The gear precision forging that proposes to the aforesaid apart from applying to the technical problem that the large-scale production of the cylinder straight-teeth gear of certain size and helical gear still has the certain distance, the utility model provides a mould for gear precision forging technology. The die can be used for forging gears with larger thickness by adopting the gear precision forging technology.
To the above problem, the utility model provides a mould for gear finish forging technology solves the problem through following technical essential: the die for the gear precision forging process comprises a female die and an upper die, wherein a cavity is formed in the female die, the upper die is used for forging, a first boss is arranged in the middle of the cavity of the female die, the first boss is in a truncated cone shape, and the tip of the first boss is the top end of the first boss;
the lower end of the upper die is also provided with a second boss, the appearance of the second boss is in a cone frustum shape, and the tip end of the second boss is the bottom end of the second boss;
during forging, the first boss is coaxial with the second boss.
In the prior art, although the gear precision forging process can be applied to processing of straight toothed spur gears, in the forging process, generally, the middle position of a blank in the axial direction is firstly subjected to forging deformation, and in the forging process, if the thickness of a gear to be prepared is too thick, the positions on the side surface of the blank are difficult to be subjected to uniform plastic deformation to fill a cavity of a female die, so that the conventional processing scheme of not arranging pore passages on the blank in advance is adopted, and the gear precision forging process can be generally only applied to processing of the gear with the thickness of less than 10 mm; the machining scheme that a pore channel is arranged on a blank in advance, and a core rod is embedded into the pore channel during forging is adopted, so that the gear precision forging process can be generally only applied to the machining of the gear with the thickness of less than 20 mm.
This scheme is when concrete application, and a blank for the finish forge includes the blank body, the blank body is: the center of the blank body is provided with a columnar structure with two blind holes, the two blind holes are coaxial, the axes of the blind holes are collinear with the axis of the blank body, orifices of the two blind holes are positioned at different ends of the blank body, the two blind holes are conical round holes, and the position with the largest diameter of each blind hole is positioned at the opening end of the blind hole; the appearance of the first boss is matched with that of one blind hole (the blind hole at the lower side of the blank body), the middle part of the lower end of the upper die for forging is provided with a second boss, and the appearance of the second boss is matched with that of the other blind hole (the blind hole at the upper side of the blank body); when the precision forging is carried out, the first boss is attached to the hole wall of the blind hole at the lower end of the blank, and the second boss is attached to the hole wall of the blind hole at the upper end of the blank.
When the scheme is used for precision forging, the blind hole walls on the blank are constrained through points on the first boss and the second boss, so that the blank has uniform stress on each position in the axis direction and each position in the circumferential direction, the purpose of deformation of each point on the side surface of the blank in an even precision forging process or a process step is achieved by optimizing the rigidity and the fluidity of blank metal, and the gear precision forging process can be well applied to the gear machining with the thickness less than 100 mm. By adopting the scheme, the taper of the finish forging piece obtained by the finish forging process is 40 percent or even less than that of the finish forging piece obtained by other existing finish forging processes or finish forging steps, and the effects of improving the gear machining efficiency and reducing the gear machining cost are achieved by reducing the subsequent machining allowance. Simultaneously, the gear manufacturing method has the advantages that the manufacturing of the gears is not limited to the traditional cutting manufacturing method, so that the product quality of the thick-size gear can be improved.
The blank can be a gear blank suitable for being manufactured by a precision forging process, such as a straight toothed spur gear, a bevel gear and the like.
Aiming at the automobile industry, such as a Steyr bridge series 0122 planet wheel, an AC16 bridge series 029 planet wheel, a Beiben bridge series 071 planet wheel, an Dongfeng Dalishen series 2405ZHS01-032 planet wheel and the like, the die provided by the scheme can be processed and prepared by a precision forging process. Aiming at the manufacture of the gears, the problems that the continuity of the metal fibers of the gear teeth is damaged and the like caused by a gear cutting manufacturing method are solved, so that the production efficiency is high, the material utilization rate is high, and meanwhile, the comprehensive performance of the gears is better and the service life of the gears is longer.
When specifically using, for making the blank can obtain stable side deformation, set up as: in the precision forging process, the upper end face of the blank is attached to the lower end face of the upper die, the lower end face of the blank is attached to the bottom face of the cavity of the female die, the surface of the first boss is attached to the corresponding blind hole, and the surface of the second boss is attached to the corresponding blind hole. Namely, the matching surface of the die for matching with the blank comprises the surfaces of the first boss and the second boss, the bottom surface of the upper cavity of the female die and the lower end surface of the upper die.
The further technical scheme is as follows:
to realize the following steps: be used for on this mould and the fitting surface of blank including the surface of first boss and second boss, also include the bottom surface of die cavity on the die and the lower terminal surface of last mould, set up to: the sum of the length value of the first boss and the length value of the second boss is smaller than the thickness value of the gear. As a person skilled in the art, in specific application, the size of the first boss is consistent with that of the blind hole matched with the first boss, the size of the second boss is consistent with that of the blind hole matched with the second boss, and the difference value of the sizes is the skinning thickness between the bottom surfaces of the two blind holes.
In order to obtain more uniform finish forging deformation, the method comprises the following steps: the diameter of the lower end of the first boss and the diameter of the upper end of the second boss are both 1-2mm smaller than the diameter of a gear shaft hole on the finished gear;
summing the length value of the first boss and the length value of the second boss to obtain a value A, wherein the difference value between the thickness value of the gear and the value A is a value B, and the value B is less than or equal to 10% of the thickness of the gear;
the conicity of the first boss and the second boss is less than 2 degrees.
In order to realize that the die can change different die cores to adapt to different products according to specific forging requirements, the purpose of improving the adaptability of the die is achieved, and the die is arranged as follows: the female die comprises a lower die core detachably connected to the female die, and the first boss is arranged on the lower die core;
go up the mould including dismantling the last mould core of connecting on last mould, the second boss sets up on last mould core.
As a specific form of gear, the gear is a spur gear or a bevel gear.
The utility model discloses following beneficial effect has:
when the scheme is used for precision forging, the blind hole walls on the blank are constrained through points on the first boss and the second boss, so that the blank has uniform stress on each position in the axis direction and each position in the circumferential direction, the purpose of deformation of each point on the side surface of the blank in an even precision forging process or a process step is achieved by optimizing the rigidity and the fluidity of blank metal, and the gear precision forging process can be well applied to the gear machining with the thickness less than 100 mm. By adopting the scheme, the taper of the finish forging piece obtained by the finish forging process is 40 percent or even less than that of the finish forging piece obtained by other existing finish forging processes or finish forging steps, and the effects of improving the gear machining efficiency and reducing the gear machining cost are achieved by reducing the subsequent machining allowance. Simultaneously, the gear manufacturing method has the advantages that the manufacturing of the gears is not limited to the traditional cutting manufacturing method, so that the product quality of the thick-size gear can be improved.
Drawings
Fig. 1 is a sectional view of a specific embodiment of a die for a gear precision forging process according to the present invention;
fig. 2 is a cross-sectional structural view of a blank matched to the die provided in fig. 1.
The labels in the figure are respectively: 1. blank, 2, blind hole, 3, connecting skin, 4, tooth form, 5, female die, 6, die cavity, 7, first boss, 8, second boss, 9 and upper die.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples:
example 1:
as shown in fig. 1 and 2, the die for the gear precision forging process comprises a female die 5 provided with a cavity 6 and an upper die 9 for forging, wherein a first boss 7 is arranged in the middle of the cavity 6 of the female die 5, the first boss 7 is in a truncated cone shape, and the tip of the first boss 7 is the top end of the first boss 7;
the lower end of the upper die 9 is also provided with a second boss 8, the second boss 8 is in a shape of a truncated cone, and the tip end of the second boss 8 is the bottom end of the second boss 8;
during forging, the first boss 7 is coaxial with the second boss 8.
In the prior art, although the gear precision forging process can be applied to processing of straight toothed spur gears, in the forging process, generally, the middle position in the axial direction of a blank is firstly subjected to forging deformation, and in the forging process, if the thickness of the gear to be prepared is too thick, the positions on the side surface of the blank are difficult to be subjected to uniform plastic deformation to fill the cavity 6 of the female die 5, so that the conventional processing scheme of not arranging pore passages on the blank in advance is adopted, and the gear precision forging process can be generally only applied to processing of the gear with the thickness of less than 10 mm; the machining scheme that a pore channel is arranged on a blank in advance, and a core rod is embedded into the pore channel during forging is adopted, so that the gear precision forging process can be generally only applied to the machining of the gear with the thickness of less than 20 mm.
This scheme is when concrete application, and a blank for the finish forge includes blank body 1, blank body 1 is: the center of the blank body is provided with a columnar structure with two blind holes 2, the two blind holes 2 are coaxial, the axes of the blind holes 2 are collinear with the axis of the blank body 1, the orifices of the two blind holes 2 are positioned at different ends of the blank body 1, the two blind holes 2 are conical round holes, and the position with the largest diameter of each blind hole 2 is positioned at the opening end of the blind hole 2; the appearance of the first boss 7 is matched with that of one blind hole 2 (the blind hole 2 at the lower side of the blank body 1), a second boss 8 is arranged in the middle of the lower end of an upper die 9 for forging, and the appearance of the second boss 8 is matched with that of the other blind hole 2 (the blind hole 2 at the upper side of the blank body 1); when the precision forging is carried out, the first boss 7 is attached to the hole wall of the blind hole 2 at the lower end of the blank, and the second boss 8 is attached to the hole wall of the blind hole 2 at the upper end of the blank.
When the scheme is used for precision forging, the hole walls of the blind holes 2 in the blank are constrained through points on the first boss 7 and the second boss 8, so that the blank has uniform stress on each position in the axis direction and each position in the circumferential direction, the purpose of deformation of each point on the side surface of the blank in an even precision forging process or a process step is achieved by optimizing the rigidity and the fluidity of blank metal, and the gear precision forging process can be well applied to gear processing with the thickness smaller than 100 mm. By adopting the scheme, the taper of the finish forging piece obtained by the finish forging process is 40 percent or even less than that of the finish forging piece obtained by other existing finish forging processes or finish forging steps, and the effects of improving the gear machining efficiency and reducing the gear machining cost are achieved by reducing the subsequent machining allowance. Simultaneously, the gear manufacturing method has the advantages that the manufacturing of the gears is not limited to the traditional cutting manufacturing method, so that the product quality of the thick-size gear can be improved.
The blank can be a gear blank suitable for being manufactured by a precision forging process, such as a straight toothed spur gear, a bevel gear and the like.
Aiming at the automobile industry, such as a Steyr bridge series 0122 planet wheel, an AC16 bridge series 029 planet wheel, a Beiben bridge series 071 planet wheel, an Dongfeng Dalishen series 2405ZHS01-032 planet wheel and the like, the die provided by the scheme can be processed and prepared by a precision forging process. Aiming at the manufacture of the gears, the problems that the continuity of the metal fibers of the gear teeth is damaged and the like caused by a gear cutting manufacturing method are solved, so that the production efficiency is high, the material utilization rate is high, and meanwhile, the comprehensive performance of the gears is better and the service life of the gears is longer.
When specifically using, for making the blank can obtain stable side deformation, set up as: in the precision forging process, the upper end face of the blank is attached to the lower end face of the upper die 9, the lower end face of the blank is attached to the bottom face of the cavity 6 of the female die 5, the surface of the first boss 7 is attached to the corresponding blind hole 2, and the surface of the second boss 8 is attached to the corresponding blind hole 2. Namely, the matching surface of the die for matching with the blank comprises the surfaces of the first boss 7 and the second boss 8, the bottom surface of the upper cavity 6 of the female die 5 and the lower end surface of the upper die 9.
Example 2:
this embodiment is further limited on the basis of embodiment 1, and to implement the following: be used for on this mould with the fitting surface of blank include first boss 7 and second boss 8 the surface, also include die 5 on the bottom surface of die cavity 6 and the lower terminal surface of last mould 9, set up to: the sum of the length value of the first boss 7 and the length value of the second boss 8 is smaller than the thickness value of the gear. As a person skilled in the art, in a specific application, the first boss 7 is consistent with the size of the blind hole 2 matched with the first boss, the second boss 8 is consistent with the size of the blind hole 2 matched with the second boss, and the difference value is the thickness of the connecting skin 3 between the bottom surfaces of the two blind holes 2.
In order to obtain more uniform finish forging deformation, the method comprises the following steps: the diameter of the lower end of the first boss 7 and the diameter of the upper end of the second boss 8 are both 1-2mm smaller than the diameter of a gear shaft hole on the finished gear;
the length value of the first boss 7 and the length value of the second boss 8 are summed to obtain a value A, the difference value between the thickness value of the gear and the value A is a value B, and the value B is less than or equal to 10% of the thickness of the gear;
the conicity of the first boss 7 and the second boss 8 is less than 2 degrees.
In order to realize that the die can change different die cores to adapt to different products according to specific forging requirements, the purpose of improving the adaptability of the die is achieved, and the die is arranged as follows: the female die 5 comprises a lower die core detachably connected to the female die 5, and the first boss 7 is arranged on the lower die core;
go up mould 9 including dismantling the last mould core of connecting on last mould 9, second boss 8 sets up on last mould core.
As a specific form of gear, the gear is a spur gear or a bevel gear.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments thereof. To the utility model belongs to the technical field of the ordinary skilled person say, do not deviate from the utility model discloses a other embodiments that reach under the technical scheme all should be contained the utility model discloses a within the scope of protection.
Claims (8)
1. The die for the gear precision forging process comprises a female die (5) provided with a cavity (6) and an upper die (9) used for forging, and is characterized in that a first boss (7) is arranged in the middle of the cavity (6) of the female die (5), the first boss (7) is in a truncated cone shape, and the tip of the first boss (7) is the top end of the first boss (7);
the lower end of the upper die (9) is also provided with a second boss (8), the second boss (8) is in a truncated cone shape, and the tip end of the second boss (8) is the bottom end of the second boss (8);
during forging, the first boss (7) is coaxial with the second boss (8).
2. The die for gear precision forging process according to claim 1, wherein the sum of the length value of the first boss (7) and the length value of the second boss (8) is smaller than the thickness value of the gear.
3. The die for gear precision forging process according to claim 2, wherein the diameter of the lower end of the first boss (7) and the diameter of the upper end of the second boss (8) are both 1-2mm smaller than the diameter of the gear shaft hole on the finished gear.
4. The die for gear precision forging process according to claim 2, wherein the sum of the length value of the first boss (7) and the length value of the second boss (8) is a value A, the difference between the thickness value of the gear and the value A is a value B, and the value B is less than or equal to 10% of the thickness of the gear.
5. The die for gear precision forging process according to claim 1, wherein the female die (5) comprises a lower core detachably connected to the female die (5), and the first boss (7) is provided on the lower core.
6. The die for gear precision forging process according to claim 1, wherein the upper die (9) comprises an upper die core detachably connected to the upper die (9), and the second boss (8) is provided on the upper die core.
7. The die for gear precision forging process according to any one of claims 1 to 6, wherein the gear is a spur gear or a bevel gear.
8. The die for gear precision forging process according to any one of claims 1 to 6, wherein the taper of the first boss (7) and the taper of the second boss (8) are both less than 2 degrees.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921127872.9U CN210188364U (en) | 2019-07-17 | 2019-07-17 | Die for gear precision forging process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921127872.9U CN210188364U (en) | 2019-07-17 | 2019-07-17 | Die for gear precision forging process |
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| CN210188364U true CN210188364U (en) | 2020-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113976809A (en) * | 2021-10-27 | 2022-01-28 | 通裕重工股份有限公司 | Device and method for determining punching position of fan main shaft and fan main shaft manufacturing method |
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2019
- 2019-07-17 CN CN201921127872.9U patent/CN210188364U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113976809A (en) * | 2021-10-27 | 2022-01-28 | 通裕重工股份有限公司 | Device and method for determining punching position of fan main shaft and fan main shaft manufacturing method |
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