CN115213282A - Method for improving spinning forming precision of internal and external tooth parts - Google Patents
Method for improving spinning forming precision of internal and external tooth parts Download PDFInfo
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- CN115213282A CN115213282A CN202110404309.7A CN202110404309A CN115213282A CN 115213282 A CN115213282 A CN 115213282A CN 202110404309 A CN202110404309 A CN 202110404309A CN 115213282 A CN115213282 A CN 115213282A
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- 238000009987 spinning Methods 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 23
- 230000033001 locomotion Effects 0.000 claims abstract description 17
- 238000013459 approach Methods 0.000 claims description 3
- 210000004210 tooth component Anatomy 0.000 claims description 2
- 230000008859 change Effects 0.000 description 5
- 238000003754 machining Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010862 gear shaping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
- B21D22/16—Spinning over shaping mandrels or formers
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
The invention discloses a method for improving the spinning forming precision of an inner tooth part and an outer tooth part, wherein in the spinning forming process, a core mold and a spinning wheel synchronously rotate, and the spinning wheel performs radial feeding motion; and in the process of forming the tooth profile, the rotating directions of the core die and the spinning wheel are changed for a single number of times according to the feeding depth of the spinning wheel. The invention carries out control by adding reverse rotation in the spinning process, and solves the problem of insufficient plastic forming process of the internal and external tooth parts.
Description
Technical Field
The invention relates to a spinning forming technology, in particular to a method for improving the spinning forming precision of an inner tooth part and an outer tooth part.
Background
The internal and external tooth parts are usually machined by machining modes such as hobbing and gear shaping, and the machining modes are cutting modes, so that material fibers are damaged, and the further improvement of the performance of the parts is limited. In order to further improve the performance of parts, some enterprises and institutions also adopt plastic forming methods to process tooth-shaped parts, and several plastic forming methods are commonly used, including rolling extrusion, rolling beating, radial forging, precision extrusion and the like, in the plastic forming methods, either single tooth profile is formed and circulated one by one, or adjacent teeth are formed and circulated one by one, and a section of the part is formed and expanded along the axial direction, in the forming processes, the rotary pressing tool is accompanied with axial and radial reciprocating feeding motions, so that the production efficiency is low, the formed teeth at the back can influence the formed teeth at the front, or the formed teeth at the back can influence the formed teeth at the front, and the high-precision tooth profile shape is difficult to obtain. Particularly, in the deformation process of the internal and external tooth parts, the deformed area and the undeformed area have asymmetry, so that the deformed area has asymmetric deformation conditions, and the side wall thickness of the parts is asymmetric. And the tooth depth deformation amount is achieved once, so that the deviation of the thickness precision is aggravated.
Fig. 1 shows the deformation of the inner and outer teeth parts at a certain moment during the spin forming process, as shown in the figure, the shapes of the blank 1 are different in the deformed region (i region) and the undeformed region (ii region), and in the deformed regions (iii region and iv region), the contact conditions between the mandrel 2 and spinning roller 3 of the deformed region (iii region) and the blank 1 are different from those of the deformed region (iv region), mainly because the mandrel 2 and spinning roller 3 are rotating and are distinguished from the material deformation angle, the deformed region (iii region) is the screwing-in side (first contact and first separation), and the deformed region (iv region) is the screwing-out side (second contact and then separation). The different contact states of the two and the tool result in the difference of friction force, so that different flowing results are generated, and the thicknesses of the screwing-in side and the screwing-out side are different.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for improving the spinning forming precision of an inner and outer tooth part, which is controlled by adding reverse rotation in the spinning process and solves the problem of insufficient plastic forming process of the inner and outer tooth part.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving the spinning forming precision of an inner tooth part and an outer tooth part comprises the following steps:
in the spinning forming process, the core mold and the spinning roller synchronously rotate, and the spinning roller performs radial feeding motion;
and in the process of forming the tooth profile, the rotating directions of the core die and the spinning wheel are changed for a single number of times according to the feeding depth of the spinning wheel.
Preferably, the radial feed motion of the rotary wheel is specifically as follows:
and in the process that the spinning wheel approaches the core mold, the rotating speed ratio between the spinning wheel and the core mold is kept unchanged.
Preferably, the rotation direction of the core mold and the spinning wheel is changed at the position where the spinning wheel is radially advanced to the maximum tooth depth position.
Preferably, the rotation direction of the core mold and the rotating wheel is changed once or three times.
Preferably, the rotation direction of the core mold and the spinning wheel is changed once, and when the spinning wheel is fed to the maximum tooth depth position, the core mold and the spinning wheel are rotated in opposite directions, and the feeding motion of the spinning wheel is stopped.
Preferably, the rotation direction of the core mold and the spinning wheel is changed for three times, and when the spinning wheel is fed to a first position before the maximum tooth depth position, the rotation direction is changed for the first time, so that the core mold and the spinning wheel are converted into reverse rotation, and the spinning wheel continues to feed;
when the spinning wheel is fed to a second position before the maximum tooth depth position, the rotation direction is changed for the second time, so that the core mold and the spinning wheel are converted into forward rotation, and the spinning wheel continues to feed;
when the rotary wheel is fed to the position with the maximum tooth depth, the rotation direction is changed for the third time, the core mould and the rotary wheel are converted into reverse rotation again, and the feeding motion of the rotary wheel is stopped.
Preferably, the first position is 2/3-3/4 of the maximum tooth depth; the second position is 5/6-7/8 of the maximum tooth depth.
Preferably, the core mold angle for changing the rotation direction for the second time is smaller than the core mold angle for changing the rotation direction for the first time, and the core mold angle for changing the rotation direction for the third time is smaller than the core mold angle for changing the rotation direction for the second time;
the mandrel angle is defined as the angle formed between the radial feed of the spinning wheel in millimeters and the feed time in seconds.
The method for improving the spinning forming precision of the internal and external tooth parts, provided by the invention, solves the problem of asymmetric thickness of the side wall of the tooth profile of the existing internal and external tooth parts, and also has the following beneficial effects:
1) The machining efficiency of the internal and external tooth parts is improved;
2) The forming precision of the internal and external tooth parts is improved.
Drawings
FIG. 1 is a schematic view of the deformation at a certain instant during a spin forming process;
FIG. 2 is a schematic view of the inner and outer tooth components;
fig. 3 is a partial view of the feed pattern of the spinning wheel relative to the mandrel during press forming in the spinning method of the present invention;
FIG. 4 is a graph showing the relationship between the forward and reverse feeding times, the radial feeding amount of the spinning roller, and the maximum tooth depth when the core mold and the spinning roller change their rotation directions several times in the spinning method of the present invention;
FIG. 5 is a graph showing the relationship between the forward and reverse feed times, the radial feed amount of the spinning roller, and the maximum tooth depth, when the rotation direction of the core mold and the spinning roller is changed several times to three times in the spinning method of the present invention.
Detailed Description
In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.
The invention provides a method for improving the spinning forming precision of an inner tooth part and an outer tooth part, which comprises the following steps:
in the spinning forming process, except for the rotating motion of the tool, the core mold and the spinning wheel rotate synchronously, and the feeding motion of the spinning wheel is radial motion, so that the processing efficiency of the internal and external tooth parts is effectively improved;
in the process of forming the tooth profile, the rotating directions of the core die and the spinning wheel are changed for a single time according to the feeding depth of the spinning wheel so as to overcome the phenomenon that the thicknesses of the side walls of the tooth profiles of the inner tooth part and the outer tooth part are not symmetrical.
Referring to fig. 1 and 2, for the internal and external teeth parts spin-formed as shown in fig. 1, spin-forming is performed according to the running form of the core mold 3 and the spinning roller 4 shown in fig. 2 (the rotating direction is shown by the arrow of the core mold 3 and the spinning roller 4 in fig. 2), the feeding motion of the spinning roller 4 is specifically a radial motion:
the core mold 3 and the spinning wheel 4 keep rotating synchronously, and the rotating speed ratio k between the spinning wheel 4 and the core mold 3 is kept constant in the process that the spinning wheel 4 approaches the core mold 3.
In order to solve the phenomenon that the thickness of the side wall of the tooth profile of the internal and external tooth parts is asymmetric, the rotation direction of the core die 3 and the rotating wheel 4 is changed into one or three times for control.
As shown in fig. 4, when the core mold 3 and the spinning roller 4 change the rotation direction for several times, the following is detailed:
when the spinning wheel 4 is fed to the maximum tooth depth position, the core mould 3 and the spinning wheel 4 rotate reversely, the feeding motion of the spinning wheel 4 is stopped, the reverse rotation angle of the core mould 3 and the spinning wheel 4 is smaller than the forward rotation angle, the reverse rotation angle of the core mould 3 and the spinning wheel 4 is 2/3-3/4 of the forward rotation angle, and the reverse rotation process is the shaping process.
Since the deviation accumulation of the thickness of the screw-in side and the screw-out side is large in the whole deformation process, the excessively thinned screw-out side may not be increased by one-time shaping, and for this reason, it is proposed to change the rotation direction of the core mold 3 and the spinning wheel 4 for three times, specifically as follows:
when the spinning wheel 4 is fed to a certain moment before the maximum tooth depth position (such as 2/3-3/4 position), the core mould 3 and the spinning wheel 4 rotate reversely by 2/3-3/4 of the angle, and the spinning wheel 4 continues to feed (such as 1/6 of the tooth depth);
the core mould 3 and the spinning wheel 4 rotate in the forward direction again, the spinning is carried out to the position with the maximum tooth depth, the feeding motion of the spinning wheel 4 is stopped, and the core mould 3 and the spinning wheel 4 rotate in the reverse direction again by 2/3-3/4 of the angle for shaping.
Referring to fig. 5, the core mold 3 and the spinning roller 4 change their rotation directions three times, and the radial feeding speed of the spinning roller 4 is gradually reduced each time, mainly because the deformation resistance is gradually increased with the gradual increase of the blank deformation amount, and the feeding speed needs to be properly reduced.
Through the shaping process of changing the rotation direction of the core mold 3 and the spinning wheel 4, high-precision internal and external tooth spinning forming parts can be obtained, and meanwhile, the machining efficiency of the parts is effectively improved.
Examples
A typical internal and external tooth part (as shown in figure 1) processed by the method for improving the spinning forming precision of the internal and external tooth part has the tooth depth of 3.3mm. The part material is an SPHC acid-washing hot-rolled high-strength steel plate produced according to the enterprise standard Q/BQB 302-2009. When the inner and outer tooth profiles are formed, the cup-shaped piece is used as a blank, and after a core die, a spinning wheel and the blank are designed and installed, the spinning forming is carried out according to the process that the core die 3 and the spinning wheel 4 change the three-time rotating direction:
1) Through the synchronizing mechanism, the spinning wheel 4 is close to the surface of the blank, the core mould 3 is started to rotate in the positive direction, and the synchronizing mechanism drives the spinning wheel 4 to rotate. The rotary wheel 4 is radially fed for 3 seconds, and the feeding is stopped when the tooth depth is 2.2 mm.
2) The rotation direction of the core mold 3 and the spinning roller 4 is changed for the first time and the feeding is stopped when the spinning roller 4 is continuously fed in the radial direction by 0.55mm for 2 seconds.
3) The rotation direction of the core mold 3 and the spinning wheel 4 is changed for the second time and the feeding is stopped when the spinning wheel 4 is continuously fed in the radial direction by 0.55mm for 3 seconds.
4) And changing the rotating direction of the core mould 3 and the spinning wheel 4 for the third time, but the spinning wheel 4 is not fed any more, finishing the spinning forming after keeping for 2 seconds, and withdrawing the spinning wheel 4 to finish the spinning forming process of the internal and external teeth parts.
In summary, the automatic transmission is mostly adopted in the high-grade automobile at present, the basic structural form of the clutch hub is the internal and external tooth form, and from the future development trend, the machining method of the parts is gradually replaced by the spinning forming process no matter considering the production efficiency, the product quality, the material utilization rate and other factors. The quality of the parts, especially the external dimensions and the wall thickness dimensional accuracy of the parts, are important indexes for judging the quality of the products. Therefore, the improvement of the precision of the internal and external tooth parts is an important aspect which needs to be considered when the spinning process is adopted to produce the internal and external tooth parts, and has wide application prospect.
The method for improving the spinning forming precision of the inner and outer tooth parts can realize the manufacturing of the inner and outer tooth parts, provides a new manufacturing solution for high-end parts of automobiles, improves the production efficiency, effectively improves the size precision of the parts, improves the product percent of pass, and realizes the performance improvement and cost optimization for a host factory.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (8)
1. A method for improving the spinning forming precision of internal and external tooth parts is characterized in that:
in the spinning forming process, the core mold and the spinning roller synchronously rotate, and the spinning roller performs radial feeding motion;
and in the process of forming the tooth profile, the rotating directions of the core die and the spinning wheel are changed for a single number of times according to the feeding depth of the spinning wheel.
2. The method for improving the spinning forming precision of the inner and outer tooth parts according to claim 1, wherein the radial feed motion of the spinning wheel is specifically as follows:
and in the process that the spinning wheel approaches the core mold, the rotating speed ratio between the spinning wheel and the core mold is kept unchanged.
3. The method for improving the spinning forming precision of the internal and external tooth parts according to claim 1, characterized in that: and changing the rotation direction of the core mold and the spinning wheel when the spinning wheel radially feeds to the position of the maximum tooth depth.
4. The method for improving the spin forming accuracy of parts with inner and outer teeth according to claim 3, wherein: the rotation direction of the core mold and the spinning wheel is changed for one time or three times.
5. The method of improving accuracy of spin forming of internal and external teeth parts according to claim 3, wherein the direction of rotation of said core mold and said spinning roller is changed once, and when said spinning roller is fed to the maximum depth position, the core mold and said spinning roller are rotated in opposite directions, and the feed motion of said spinning roller is stopped.
6. The method for improving the accuracy of spin forming of internal and external tooth components of claim 3, wherein the direction of rotation of said mandrel and said spinning wheel is changed three times,
when the spinning wheel is fed to a first position before the maximum tooth depth position, the rotating direction is changed for the first time, so that the core mold and the spinning wheel are converted into reverse rotation, and the spinning wheel continues to feed;
when the spinning wheel is fed to a second position before the maximum tooth depth position, the rotation direction is changed for the second time, so that the core mold and the spinning wheel are converted into forward rotation, and the spinning wheel continues to feed;
when the spinning wheel is fed to the position with the maximum tooth depth, the rotation direction is changed for the third time, the core mould and the spinning wheel are converted into reverse rotation again, and the feeding motion of the spinning wheel is stopped.
7. The method for improving the spinning forming precision of the internal and external tooth parts according to claim 6, wherein the steps of: the first position is 2/3-3/4 of the maximum tooth depth; the second position is 5/6-7/8 of the maximum tooth depth.
8. The method for improving the spin forming accuracy of internal and external tooth parts according to claim 4 or 5, wherein: the core mold angle for changing the rotation direction for the second time is smaller than the core mold angle for changing the rotation direction for the first time, and the core mold angle for changing the rotation direction for the third time is smaller than the core mold angle for changing the rotation direction for the second time;
the core rotation angle is defined as the angle formed between the radial feed of the spinning wheel in millimeters and the feed time in seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404309.7A CN115213282A (en) | 2021-04-15 | 2021-04-15 | Method for improving spinning forming precision of internal and external tooth parts |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110404309.7A CN115213282A (en) | 2021-04-15 | 2021-04-15 | Method for improving spinning forming precision of internal and external tooth parts |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002035879A (en) * | 2000-07-28 | 2002-02-05 | Honda Motor Co Ltd | Internal gear formation method |
| JP2010284662A (en) * | 2009-06-09 | 2010-12-24 | Nippon Spindle Mfg Co Ltd | Apparatus and method for manufacturing cup-like gear |
| CN103316983A (en) * | 2013-06-06 | 2013-09-25 | 西安交通大学 | Two-wheel flexible spinning technology applicable to radial grooves of synchronous cog belt pulleys |
| CN103624129A (en) * | 2012-08-23 | 2014-03-12 | 中国航天科技集团公司长征机械厂 | Spinning forming new technology of shell part with inner and outer teeth |
| CN110076230A (en) * | 2019-04-04 | 2019-08-02 | 华南理工大学 | A kind of profiled parts rolling rotary pressing moulding device and method |
-
2021
- 2021-04-15 CN CN202110404309.7A patent/CN115213282A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002035879A (en) * | 2000-07-28 | 2002-02-05 | Honda Motor Co Ltd | Internal gear formation method |
| JP2010284662A (en) * | 2009-06-09 | 2010-12-24 | Nippon Spindle Mfg Co Ltd | Apparatus and method for manufacturing cup-like gear |
| CN103624129A (en) * | 2012-08-23 | 2014-03-12 | 中国航天科技集团公司长征机械厂 | Spinning forming new technology of shell part with inner and outer teeth |
| CN103316983A (en) * | 2013-06-06 | 2013-09-25 | 西安交通大学 | Two-wheel flexible spinning technology applicable to radial grooves of synchronous cog belt pulleys |
| CN110076230A (en) * | 2019-04-04 | 2019-08-02 | 华南理工大学 | A kind of profiled parts rolling rotary pressing moulding device and method |
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