CN212525861U - Combined die combining back taper and finishing of toothed gear - Google Patents
Combined die combining back taper and finishing of toothed gear Download PDFInfo
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- CN212525861U CN212525861U CN202020761279.6U CN202020761279U CN212525861U CN 212525861 U CN212525861 U CN 212525861U CN 202020761279 U CN202020761279 U CN 202020761279U CN 212525861 U CN212525861 U CN 212525861U
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Abstract
The utility model relates to a combined die combining the back taper and finishing of a toothed gear, which comprises a back taper module, a finishing module, a die positioning ring, a fixed distance ring, a supporting pad, a vertical moving device, an inner cone pressing sleeve and a compression spring; the outer side of the inverted cone module is sleeved with an inner conical surface pressing sleeve, and the inner side of the inverted cone module is provided with an elastic ring; the lower end of the finishing module is coaxially provided with an adjusting pad; the up-down moving device is coaxially arranged at the lower end of the supporting pad; the lower end of the fixed distance ring is contacted with the supporting pad, the upper end of the fixed distance ring is provided with a groove, and the upper end of the spring is contacted with the lower end surface of the inner cone pressing sleeve; the inner surface of each tooth block of the inverted cone module is provided with inner teeth, the outer surface of each tooth block of the inverted cone module is a conical surface, the tooth blocks are cut along the radial direction one by one and divided into one tooth block, and the upper half sector-shaped groove of the positioning ring of the die is in clearance fit with the tooth blocks of the inverted cone module; the lower end of the finishing module is provided with a cylindrical extension part, and the cylindrical extension part is in clearance fit with an inner hole of the die positioning ring; the tooth sheet at the flange at the lower part of the finishing module is in clearance fit with the groove of the die positioning ring, and the die is stably and accurately positioned.
Description
Technical Field
The utility model relates to a gear precision forging field, specifically say, relate to an automotive transmission combines cold finishing of tooth gear and the precision forging assembling die of crowded back taper.
Background
With the development of the automobile industry, the demand of the finish-forged combined gear of the automobile transmission gear is increasing. At present, the technological process commonly adopted by the precision forging of the automobile transmission gear and the gear at home and abroad is as follows: blanking, hot die forging, normalizing, phosphorizing, cold finishing and inverted cone extruding. Wherein the cold finishing process requires an expensive cold extrusion press and requires normalization and phosphating pretreatment. The finishing die is usually processed by electric spark discharge, which is labor-consuming, time-consuming and short in service life. In order to simplify the process, realize energy-saving and material-saving and green and environment-friendly, CN 107497985B provides a combined tooth precision forging combined process, and adopts a precision forging combined die to change the traditional process extrusion metal flowing and filling forming mode into radial extrusion deformation, so that the finishing process and the inverted cone process in the traditional combined gear precision forging process are combined into one process, and the process of the process is as follows: blanking, hot die forging and back taper, and the normalizing, phosphorizing and finishing processes of the original process are cancelled.
When the composite process is tried to be produced and implemented, the assembly of the die is very time-consuming, and the dozens of inverted cone modules are fixed only by the movable retaining ring in the middle, so that the accurate positioning is difficult in the circumferential direction. After the machining is finished, the radial runout of the gear ring of the combined tooth is unstable, the out-of-tolerance is more, and the combined tooth is easy to be unqualified.
SUMMERY OF THE UTILITY MODEL
This application is mainly to the precision forging assembling die among CN 107497985B, and the combination gear radial runout super poor problem that causes provides a neotype back taper, the assembling die of finishing.
One technical scheme of the application is as follows: a combined die combining back taper and finishing of a toothed gear is arranged between an upper die holder and a lower die holder and comprises a back taper module, a finishing module, a die positioning ring, a fixed distance ring, a supporting pad, an up-and-down moving device, an inner cone pressing sleeve and a compression spring; the inverted cone module is fixed on the die positioning ring, the outer side of the inverted cone module is sleeved with the inner conical surface pressing sleeve, and an elastic ring is arranged between the inner side of the inverted cone module and the finishing module; the finishing module is coaxially arranged in an inner cavity of the inverted cone module, the lower end of the finishing module is coaxially provided with an adjusting pad, and the adjusting pad penetrates through the die positioning ring and the supporting pad; the up-down moving device is coaxially arranged at the lower end of the supporting pad and sleeved on a guide supporting column in the inner cavity of the lower die base; the lower end of the fixed distance ring is contacted with the supporting pad, the upper end of the fixed distance ring is provided with a plurality of grooves for placing compression springs, the upper end of each spring is contacted with the lower end surface of the inner conical pressing sleeve, and the pressing sleeve is lifted after the pressure is cancelled; the inner surface of each tooth block of the inverted cone module is provided with inverted cone inner teeth which have the same shape as the combined tooth, the outer surface of each tooth block of the inverted cone module is a conical surface, the tooth blocks are cut along the radial direction one by one, and are divided into one tooth block, the upper half part of the die positioning ring is circumferentially provided with a fan-shaped groove, the size and the shape of the fan-shaped groove are consistent with those of the tooth blocks of the inverted cone module, and the fan-shaped groove and the tooth blocks form clearance fit; the lower end of the finishing module is provided with a cylindrical extension part, and the cylindrical extension part is in clearance fit with an inner hole of the die positioning ring; and a toothed sheet is arranged on the lower flange of the finishing module in the circumferential direction and is in clearance fit with the groove of the die positioning ring.
Preferably, the up-down moving means is a disc spring.
Preferably, four grooves for placing compression springs are formed in the upper end of the fixed distance ring.
Preferably, the conical surface has a cone angle of 10 °.
Preferably, the depth of the fan-shaped groove is 10-20 mm.
Preferably, the clearance L between supporting pad and the die holder is 3 ~ 5 mm.
Preferably, the upper end of the finishing module has a die cavity for shaping the combined tooth locking angle.
The utility model provides a working principle who combines assembling die of pinion back taper and finishing does:
in the initial state, the inner cone pressing sleeve 8 is lifted up under the action of the compression spring 10, the tooth block of the inverted cone module 1 is loosened by the elastic ring 9, and a workpiece is easily installed in a die;
after a workpiece is loaded, the upper die base 7 moves downwards to push the inner cone pressing sleeve 8 to move downwards together, the inverted cone module 1 is back to the inner cone pressing sleeve 8 and extrudes towards the center along the fan-shaped groove of the die positioning ring 3, and when the inner cone pressing sleeve 8 moves downwards to press the fixed-range ring 5, inverted cone is completed. Working pressure surpasses belleville spring 6 and sets for back taper pressure this moment, and back taper module 1, mould position circle 3, stroke setting circle 4, supporting pad 5 drive work piece downstream distance are seen figure 1 for L, and finishing module 2 of arranging the work piece below carries out the plastic to combining the tooth lock angle, accomplishes the processing of combining tooth back taper angle and lock angle.
After the workpiece is processed, the upper die base 7 is retracted, the die is restored to the initial state, the workpiece is unloaded, and a processing cycle is completed.
Compared with the prior art, the utility model, following positive effect has:
1. in the patent document CN 107497985B, each tooth block of the reverse taper module 1 is connected with the finishing module 2 by the spline of the external spline, and the tooth block can be positioned in the circumferential direction and the radial direction. Because the positioning of the reverse taper module 1 in the circumferential direction is only at the internal tooth part of each tooth block with the reverse taper, the matched length and depth are very short, and compared with the reverse taper module with a larger side surface area, the positioning space is too small, so that the reverse taper module is not stable enough in the circumferential direction and is difficult to accurately position; after the machining is finished, the radial runout of the gear ring of the combined tooth is unstable, the out-of-tolerance is large, and the combined tooth is easy to disqualify.
In the application, the outer surface of the upper end of the finishing module 2 is not provided with a positioning external spline, and the surface of the cylindrical extension part at the lower end of the finishing module is in clearance fit with the surface of an inner hole of the die positioning ring 3, so that the finishing module can play a role in radial positioning; the die positioning ring 3 is provided with a positioning fan-shaped groove corresponding to the tooth socket of the combined tooth, the groove is deep and matched with the inverted cone module 1, and the positioning is stable and accurate; the flange at the lower end of the finishing module 2 is also circumferentially provided with tooth blocks which correspond to tooth grooves of the positioning ring 3 and can be in clearance fit with each other, so that the finishing module 2 is stably and accurately positioned in the circumferential direction. The back taper module and the finishing die are uniformly positioned in the circumferential direction and the radial direction by taking the positioning ring 3 as a reference, so that the problem of the radial runout of the combined tooth caused by inaccurate positioning of the die in the patent document with the publication number of CN 107497985B is solved.
2. In the patent document disclosed in publication No. CN 107497985B, when the mold is assembled, several tens of inverted cone modules are fixed only by the movable retaining ring in the middle, so that the assembly is time-consuming and the production efficiency is low. In this application, save the retainer ring to the hole and the tooth's socket of retainer ring 3 are the location benchmark, and the locating surface is big, and the location is stable, accurate, and production efficiency improves greatly.
Drawings
Fig. 1 is a schematic view of an assembly structure of a combined die combining tooth finishing and back taper provided by the present invention;
FIG. 2 is a perspective view of the mold cage 3 of FIG. 1;
FIG. 3 is a front cross-sectional view of the finishing module of FIG. 1;
fig. 4 is a top view of the finishing module of fig. 1.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The utility model provides a combination die combining inverted cone and finishing of a toothed gear, which is shown in the figures 1-4 and is arranged between an upper die base 7 and a lower die base 12, and comprises an inverted cone module 1, a finishing module 2, a die positioning ring 3, a fixed distance ring 4, a supporting pad 5, an up-down moving device 6, an inner cone pressing sleeve 8 and a compression spring 10; the inverted cone module 1 is fixed on the die positioning ring 3, an inner conical surface pressing sleeve 8 is sleeved on the outer side of the inverted cone module 1, and an elastic ring 9 is arranged between the inner side of the inverted cone module 1 and the finishing module 2; the finishing module 2 is coaxially arranged in the inner cavity of the inverted cone module 1, the lower end of the finishing module 2 is coaxially provided with an adjusting pad 11, and the adjusting pad 11 penetrates through the die positioning ring 3 and the supporting pad 5; the up-down moving device 6 is coaxially arranged at the lower end of the supporting pad 5 and is sleeved on a guide supporting column 15 in the inner cavity of the lower die base; the lower end of the fixed distance ring 4 is contacted with the supporting pad 5, the upper end of the fixed distance ring 4 is provided with a plurality of grooves for placing compression springs 10, the springs 10 are fixed in the grooves, the upper end of the springs is contacted with the lower end surface of the inner conical pressing sleeve 8, and the pressing sleeve 8 is lifted up after the pressure is cancelled; the inner surface of each tooth block of the inverted cone module 1 is the same as the tooth shape of the combined tooth and is provided with inverted cone inner teeth, the outer surface of each tooth block of the inverted cone module 1 is a conical surface, the tooth blocks are cut along the radial direction one by one and are divided into one tooth block, the upper half part of the die positioning ring 3 is circumferentially provided with a fan-shaped groove 18, the size and the shape of the fan-shaped groove are consistent with those of the tooth block of the inverted cone module 1, and the fan-shaped groove and the tooth block form clearance fit; the lower end of the finishing module 2 is provided with a cylindrical extension part 14 which is in clearance fit with an inner hole of the die locating ring 3; the lower flange 16 of the finishing module 2 is circumferentially provided with a toothed plate 17 which is in clearance fit with the groove of the die locating ring 3. The up-down moving device is generally a disc spring, and four grooves for placing compression springs 10 are generally formed in the upper end of the fixed distance ring 4. The taper angle of the conical surface is preferably 10 °.
The working principle of the combined die combining the back taper and finishing of the tooth gear is as follows:
in the initial state, the inner cone pressing sleeve 8 is lifted up under the action of the compression spring 10, the tooth block of the inverted cone module 1 is loosened by the elastic ring 9, and a workpiece is easily installed in a die;
after a workpiece is loaded, the upper die base 7 moves downwards to push the inner cone pressing sleeve 8 to move downwards together, the inverted cone module 1 is back to the inner cone pressing sleeve 8 and extrudes towards the center along the fan-shaped groove of the die positioning ring 3, and when the inner cone pressing sleeve 8 moves downwards to press the fixed-range ring 5, inverted cone is completed. Working pressure surpasses belleville spring 6 and sets for back taper pressure this moment, and back taper module 1, mould position circle 3, stroke setting circle 4, supporting pad 5 drive work piece downstream distance are seen figure 1 for L, and finishing module 2 of arranging the work piece below carries out the plastic to combining the tooth lock angle, accomplishes the processing of combining tooth back taper angle and lock angle.
After the workpiece is processed, the upper die base 7 is retracted, the die is restored to the initial state, the workpiece is unloaded, and a processing cycle is completed.
In the application, the depth of the fan-shaped groove is preferably 10-20 mm, so that the fan-shaped groove is added compared with the original design, and the depth of the fan-shaped groove is set to be relatively deep after 10-20 mm, and the fan-shaped groove is matched with the inverted cone module 1, so that the positioning is more stable and accurate.
In this application, the clearance L between supporting pad 5 and the die holder 12 is preferred 3 ~ 5mm to distance between work piece and the finishing mould in this scheme of adaptation.
Of course, the upper end of the finishing module 2 has a cavity 13 for shaping the associated tooth locking angle, which is well known to the person skilled in the art and will not be described in further detail here.
Compared with the prior art, the utility model, following positive effect has:
1. in the patent document CN 107497985B, each tooth block of the reverse taper module 1 is connected with the finishing module 2 by the spline of the external spline, and the tooth block can be positioned in the circumferential direction and the radial direction. Because the positioning of the reverse taper module 1 in the circumferential direction is only at the internal tooth part of each tooth block with the reverse taper, the matched length and depth are very short, and compared with the reverse taper module with a larger side surface area, the positioning space is too small, so that the reverse taper module is not stable enough in the circumferential direction and is difficult to accurately position; after the machining is finished, the radial runout of the gear ring of the combined tooth is unstable, the out-of-tolerance is large, and the combined tooth is easy to disqualify.
In the application, the outer surface of the upper end of the finishing module 2 is not provided with a positioning external spline, and the surface of the cylindrical extension part at the lower end of the finishing module is in clearance fit with the surface of an inner hole of the die positioning ring 3, so that the finishing module can play a role in radial positioning; the die positioning ring 3 is provided with a positioning fan-shaped groove corresponding to the tooth socket of the combined tooth, the groove is deep and matched with the inverted cone module 1, and the positioning is stable and accurate; the flange at the lower end of the finishing module 2 is also circumferentially provided with tooth blocks which correspond to tooth grooves of the positioning ring 3 and can be in clearance fit with each other, so that the finishing module 2 is stably and accurately positioned in the circumferential direction. The back taper module and the finishing die are uniformly positioned in the circumferential direction and the radial direction by taking the positioning ring 3 as a reference, so that the problem of the radial runout of the combined tooth caused by inaccurate positioning of the die in the patent document with the publication number of CN 107497985B is solved.
2. In the patent document disclosed in publication No. CN 107497985B, when the mold is assembled, several tens of inverted cone modules are fixed only by the movable retaining ring in the middle, so that the assembly is time-consuming and the production efficiency is low. In this application, save the retainer ring to the hole and the tooth's socket of retainer ring 3 are the location benchmark, and the locating surface is big, and the location is stable, accurate, and production efficiency is high a lot.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the present invention, and the words first, second, etc. are used only for the distinction of names and not for the limitation of technical terms, and it is obvious to those skilled in the art that the present invention can be variously modified and changed. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A combined die combining back taper and finishing of a toothed gear is arranged between an upper die holder (7) and a lower die holder (12), and comprises a back taper module (1), a finishing module (2), a die positioning ring (3), a stroke fixing ring (4), a supporting pad (5), an up-down moving device (6), an inner cone pressing sleeve (8) and a compression spring (10); the inverted cone module (1) is fixed on the die positioning ring (3), the outer side of the inverted cone module is sleeved with an inner conical surface pressing sleeve (8), and an elastic ring (9) is arranged between the inner side of the inverted cone module and the finishing module (2); the finishing module (2) is coaxially arranged in an inner cavity of the inverted cone module (1), the lower end of the finishing module is coaxially provided with an adjusting pad (11), and the adjusting pad (11) penetrates through the die positioning ring (3) and the supporting pad (5); the up-down moving device (6) is coaxially arranged at the lower end of the supporting pad (5) and is sleeved on a guide supporting column (15) in the inner cavity of the lower die base; the lower end of the fixed distance ring (4) is in contact with the supporting pad (5), the upper end of the fixed distance ring is provided with a plurality of grooves for placing compression springs (10), the upper end of each spring (10) is in contact with the lower end face of the inner conical pressing sleeve (8), and the pressing sleeve (8) is lifted up after the pressure is cancelled;
the mold is characterized in that the inner surface of each tooth block of the inverted cone module (1) is provided with inverted cone inner teeth with the same shape as that of a combined tooth, the outer surface of each tooth block of the inverted cone module (1) is a conical surface, the tooth blocks are cut along the radial direction one by one to be divided into one tooth block, the upper half part of the mold positioning ring (3) is circumferentially provided with a fan-shaped groove (18), the size and the shape of the fan-shaped groove are consistent with those of the tooth block of the inverted cone module (1), and the fan-shaped groove and the tooth block form clearance fit; the lower end of the finishing module (2) is provided with a cylindrical extension part (14), and the cylindrical extension part is in clearance fit with an inner hole of the die locating ring (3); and a tooth sheet (17) is arranged on the lower flange (16) of the finishing module (2) in the circumferential direction and is in clearance fit with the groove of the die locating ring (3).
2. The combination die for combining back taper and finishing of a toothed gear according to claim 1, wherein the up-and-down moving means is a belleville spring.
3. The combination die for back taper and finishing of the combined-tooth gear is characterized in that the upper end of the fixed distance ring (4) is provided with four grooves for placing the compression springs (10).
4. A combination die for back taper and finishing of a combination toothed gear as set forth in claim 1, wherein said conical surface has a taper angle of 10 °.
5. The combination reverse taper and finishing die for a combination toothed gear according to claim 1, wherein the depth of the scalloped grooves is 10-20 mm.
6. The combination die combining the back taper and the finishing of the toothed gear according to claim 1, wherein the clearance L between the supporting pad (5) and the lower die holder (12) is 3-5 mm.
7. A combination reverse taper and finishing die for combination toothed gears according to claim 1, characterized in that the upper end of the finishing module (2) has a die cavity (13) for shaping the locking angle of the combination teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020761279.6U CN212525861U (en) | 2020-05-09 | 2020-05-09 | Combined die combining back taper and finishing of toothed gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020761279.6U CN212525861U (en) | 2020-05-09 | 2020-05-09 | Combined die combining back taper and finishing of toothed gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212525861U true CN212525861U (en) | 2021-02-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020761279.6U Active CN212525861U (en) | 2020-05-09 | 2020-05-09 | Combined die combining back taper and finishing of toothed gear |
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| Country | Link |
|---|---|
| CN (1) | CN212525861U (en) |
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- 2020-05-09 CN CN202020761279.6U patent/CN212525861U/en active Active
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