CN211360920U - Multi-head diameter-increasing worm gear hob - Google Patents
Multi-head diameter-increasing worm gear hob Download PDFInfo
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- CN211360920U CN211360920U CN201922133865.6U CN201922133865U CN211360920U CN 211360920 U CN211360920 U CN 211360920U CN 201922133865 U CN201922133865 U CN 201922133865U CN 211360920 U CN211360920 U CN 211360920U
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- 238000005520 cutting process Methods 0.000 claims abstract description 76
- 244000309464 bull Species 0.000 claims description 10
- 238000003754 machining Methods 0.000 abstract description 18
- 238000009434 installation Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
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- 239000003638 chemical reducing agent Substances 0.000 description 2
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Abstract
A multi-head diameter-increasing worm gear hob is characterized in that the pitch, the head number and the helix angle of a hob body and a multi-head worm are consistent, and the reference circle diameter of the hob body is increased by 5% -15% compared with that of the multi-head worm; the cutter body comprises a cutting column and a cutting cone positioned at the cutter feeding end, and the cutting column is consistent with the tooth profile angle, the tooth thickness and the tooth height of the multi-head worm; the taper of the cutting cone is 10-15 degrees, the length of the cutting cone at least comprises 4 complete teeth, and the tooth thickness is smaller than that of the cutting column. Because the worm gear hob and the multi-head worm have the same number of heads and the same spiral angle, the interference of the cutter teeth during installation is avoided, and the tooth form of the multi-head worm gear is ensured to be correct. The diameter of the reference circle of the cutter body is increased by 5% -15%, a correct meshing area can be obtained, noise can be effectively reduced, the meshing effect is improved, and the purpose of improving machining precision is finally achieved. The cutting cone enables the worm gear hob to have a rough machining step during feeding, and when the cutting column starts to perform fine machining, the cutting pressure is effectively reduced, so that the service life of the worm gear hob is prolonged.
Description
Technical Field
The utility model belongs to the technical field of metal cutting tool, a bull number increases footpath worm gear hobbing cutter is related to.
Background
The worm and gear mechanism is commonly used for transmitting the motion and the power between two staggered shafts, is the most common transmission mode, has a larger transmission ratio, and has the characteristics of compact structure, stable transmission, low noise and self-locking function. The gear reducer is widely applied to the fields of speed reducers, special transmissions, engineering machinery, war industry, equipment manufacturing and the like. Since the transmission ratio of the worm and gear mechanism is more and more required in various fields, the demand for a multi-head worm and gear pair is greatly increased. The multi-head worm-gear worm pair consists of a multi-head worm with the head number larger than 2 and a multi-head worm gear.
The multi-head worm gear pair is adopted more and more, and the corresponding requirement on the processing precision of the multi-head worm gear pair is higher and higher. In the existing method for machining a multi-head worm gear and worm pair, a multi-head worm can be machined by a high-precision worm grinding machine, and a multi-head worm gear is machined by adjusting the installation angle by adopting a single-head worm gear hob. The problems of the multi-head worm wheel processed by the method are as follows: the meshing area of the multi-head worm wheel processed by the single-head worm wheel hob is inconsistent with the required meshing area, and the design requirement cannot be met. This is due to: the helix angle of a multi-start worm gear is typically greater than 15, while the helix angle of a single start worm gear hob is relatively small. The helical angle of the worm gear is large, so that the tooth form of the worm gear has certain spatial distortion. When a worm gear is machined by adopting the single-head worm gear hob, the machined worm gear tooth shape has errors by adjusting the installation angle, finally, meshing areas of the multi-head worm gear and the multi-head worm are positioned at two ends of the worm gear in the tooth direction when meshing, and the normal meshing area is in the middle of the worm gear. From the above, it is known that a multi-head worm gear and worm pair requiring high precision cannot machine a multi-head worm gear by using a single-head worm hob. In addition, current worm gear hobbing cutter all is cylindrical, when carrying out bull worm wheel machining, can't distinguish rough machining and finish machining, and this life that just causes the hobbing cutter reduces.
The chamfering of the worm wheel is one of important links of worm wheel processing, and the chamfering of the worm wheel usually has two modes, one mode is manual chamfering, and the other mode is chamfering by adopting a special worm wheel chamfering deburring machine. Both methods are performed after the worm gear is machined. The processing quality of the manual chamfering is unstable, when the worm gear chamfering deburring machine is used for chamfering, the tooth profile of the worm gear needs to be processed firstly, and then the worm gear chamfering deburring machine is installed on the chamfering machine for processing, so that the chamfering link is added in the production process, and the production efficiency of the worm gear is reduced.
Disclosure of Invention
In view of this, the utility model provides a bull number increases footpath worm gear hobbing cutter improves the machining precision of bull worm wheel, makes the bull worm wheel of processing out have correct meshing region, makes the hobbing cutter have longer life simultaneously.
The utility model adopts the technical proposal that: the utility model provides a bull number increases footpath worm gear hobbing cutter, includes handle of a knife and cutter body, and helical arrangement has sword tooth, its characterized in that on the cutter body: the pitch, the number of heads and the helix angle of the cutter body and the multi-head worm are consistent, and the reference circle diameter of the cutter body is increased by 5-15% compared with the reference circle diameter of the multi-head worm; the cutter body comprises a cylindrical cutting column and a conical cutting cone, the cutting cone is located at the feed end of the worm gear hob, the cutting column is consistent with the tooth profile angle, the tooth thickness and the tooth height of the multi-head worm, the taper of the cutting cone is 10-15 degrees, the length of the cutting cone at least comprises 4 complete teeth, and the tooth thickness of the cutting cone is smaller than that of the cutting column.
Furthermore, the tooth thickness of the cutting cone is 0.2-0.4 mm smaller than that of the cutting column.
Furthermore, the same chamfer teeth are arranged at the bottom of the tooth shape of the cutting column and the cutting cone, the height of the chamfer teeth is 0.1-0.3 times of the tooth shape modulus of the cutting column, and the angle of the chamfer teeth is 40-50 degrees.
Furthermore, the number of heads of the worm gear hob is 2-12.
The utility model has the advantages that: because the worm gear hob and the multi-head worm have the same number of heads and the same spiral angle, the interference of cutter teeth during installation is avoided, the multi-head worm can be machined only by determining the installation angle without repeatedly adjusting the installation angle, and the correctness of the tooth form of the multi-head worm is ensured. Under the condition that the pitch of the base circle is the same as the spiral angle, the diameter of the reference circle of the worm gear hob is increased by 5% -15%, when the worm gear hob is used for machining a multi-head worm gear, the bases of the inlet and outlet meshing ends of the upper end and the lower end of the worm gear can be correspondingly removed, finally, when the multi-head worm gear pair is actually meshed, the contact area can be close to the middle of the worm gear pair, once the worm gear pair is loaded, the contact area runs to the two sides, the correct meshing area is finally obtained, the noise can be effectively reduced, the meshing effect is improved, and the purpose of improving the. In addition, the cutting cone is arranged to enable the worm gear hob to have rough machining during feeding, when the cutting column starts to perform fine machining, cutting pressure is effectively reduced, and the service life of the worm gear hob is further prolonged.
In the additional technical characteristics, the chamfer teeth arranged at the bottoms of the cutting column and the cutting conical teeth can finish the chamfer of the tooth top part of the multi-head worm gear by one-step processing when the multi-head worm gear is processed by the worm gear hob, and because the chamfer teeth are consistent, the processed chamfer quantity is consistent, on one hand, the processing quality of the multi-head worm gear is improved, and on the other hand, the processing efficiency is also effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the tooth profile of a cutting cylinder cutter tooth.
Fig. 3 is a schematic view of the tooth profile of a cutting cone.
In the figure: 1. the chamfering tool comprises a tool handle, 2 parts of a tool body, a detection table, 3 parts of a transition shaft, 4 parts of a tool body, 4-1 parts of a cutting column, 4-2 parts of a cutting cone, 5 parts of a chamfering tooth, wherein L is the length of the cutting cone, alpha is the angle of the chamfering tooth, and h is the height of the chamfering tooth.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the multi-head diameter-increasing worm gear hob comprises a hob handle 1 and a hob body 4. Cutter teeth are spirally arranged on the cutter body 4. The utility model discloses in use the bull worm in the bull worm gear worm pair as the reference, worm gear hob's cutter body 4 is all unanimous with the base circle pitch, the first number and the helix angle of bull worm. The number of heads of the worm gear hob is 2-12. The diameter of the reference circle of a large number of worms is increased by 5% -15% only on the diameter of the reference circle of the worm gear hob body 4. As the worm gear hob and the multi-head worm have the same head number and the same spiral angle, the interference of the hob teeth during installation is avoided. Therefore, the multi-head worm can be machined only by determining the installation angle without repeatedly adjusting the installation angle, and the tooth form of the multi-head worm wheel is ensured to be correct. Under the condition that the pitch of the base circle is the same as the spiral angle, the diameter of the reference circle of the worm gear hob is increased by 5% -15%, when the worm gear hob is used for machining a multi-head worm gear, the bases of the inlet and outlet meshing ends of the upper end and the lower end of the worm gear can be correspondingly removed, finally, when the multi-head worm gear pair is actually meshed, the contact area can be close to the middle of the worm gear pair, once the worm gear pair is loaded, the contact area runs to the two sides, the correct meshing area is finally obtained, noise can be effectively reduced, the meshing effect is improved, and the purpose of improving the machining precision.
As shown in fig. 1, the cutter body 4 includes a cylindrical cutting post 4-1 and a tapered cutting cone 4-2, the cutting cone 4-2 being located at the feed end of the worm gear hob. Specifically, the direction of the cutting cone 4-2 is the same as the helix, for a left-handed worm gear hob, the cutting cone 4-2 is on the left side, and for a right-handed worm gear hob, the cutting cone 4-2 is on the right side. The cutting column 4-1 is consistent with the tooth profile angle, the tooth thickness and the tooth height of the multi-start worm. The taper of the cutting cone 4-2 is 10-15 degrees, the length L of the cutting cone 4-2 at least ensures that more than 4 complete teeth exist, and the tooth thickness of the cutting cone 4-2 is smaller than that of the cutting column 4-1. When the worm gear hob cuts, the cutting cone 4-2 at the cutter feeding end can be fed gradually, so that the cutting force during cutting is reduced. Meanwhile, the tooth thickness of the cutting cone 4-2 is 0.2-0.4 mm smaller than that of the cutting column 4-1, when the worm gear is machined by adopting tangential feeding, the cutting cone 4-2 firstly takes part in cutting to remove most of allowance, and the allowance of 0.2-0.4 mm is reserved on the tooth profile, so that the cutting column 4-1 can efficiently machine the tooth profile of the worm gear with high quality. Because the cutting cone 4-2 and the cutting column 4-1 are respectively subjected to rough machining and finish machining, the machining allowance of the cutting column 4-1 is reduced, and the service life of the worm gear hob can be effectively prolonged.
In addition, because the cutting cone 4-2 has an angle of 10-15 degrees, when the worm gear hob adopts tangential feeding, the cutter tooth structure strength of the cutting cone 4-2 is good, and the cutting resistance is small for gradual cutting, and when the cutter tooth of the cutting column 4-1 is tangentially walked, the machining allowance of the multi-head worm gear is already small. Thereby improving the processing efficiency of the worm wheel.
As shown in figures 2 and 3, the same chamfer teeth 5 are arranged at the tooth form bottoms of the cutting column 4-1 and the cutting cone 4-2, the height h of the chamfer teeth 5 is 0.1-0.3 times of the tooth form modulus of the cutting column 4-1, and the angle alpha of the chamfer teeth 5 is 40-50 degrees. When the worm hob cuts the multi-head worm gear, the chamfer of the tooth crest part of the multi-head worm gear is processed at one time, and because the chamfer teeth 5 are consistent, the processed chamfer amount is consistent, on one hand, the processing quality of the multi-head worm gear is improved, and on the other hand, the processing efficiency is also effectively improved.
The gear hob is convenient to detect jumping and relief grinding tooth shapes during manufacturing of the gear hob and also is used for detecting radial jumping during use of the gear hob, and mounting accuracy and machining quality are improved. As shown in figure 1, the two sides of the cutter teeth of the worm gear hob are provided with detection platforms 2, the width of the detection platforms is 5mm, and the outer diameter of the detection platforms is 2mm larger than that of the transition shaft 3.
Claims (4)
1. The utility model provides a bull number increases footpath worm gear hobbing cutter, includes handle of a knife and cutter body, and helical arrangement has sword tooth, its characterized in that on the cutter body: the pitch, the number of heads and the helix angle of the cutter body and the multi-head worm are consistent, and the reference circle diameter of the cutter body is increased by 5-15% compared with the reference circle diameter of the multi-head worm; the cutter body comprises a cylindrical cutting column and a conical cutting cone, the cutting cone is located at the feed end of the worm gear hob, the cutting column is consistent with the tooth profile angle, the tooth thickness and the tooth height of the multi-head worm, the taper of the cutting cone is 10-15 degrees, the length of the cutting cone at least comprises 4 complete teeth, and the tooth thickness of the cutting cone is smaller than that of the cutting column.
2. The multi-head increasing diameter worm gear hob according to claim 1, characterized in that: the tooth thickness of the cutting cone is 0.2-0.4 mm smaller than that of the cutting column.
3. A multi-head diameter-increasing worm gear hob as claimed in claim 1 or 2, wherein: the same chamfer teeth are arranged at the bottom of the tooth shape of the cutting column and the cutting cone, the height of the chamfer teeth is 0.1-0.3 times of the tooth shape modulus of the cutting column, and the angle of the chamfer teeth is 40-50 degrees.
4. The multi-head increasing diameter worm gear hob according to claim 1, characterized in that: the number of heads of the worm gear hob is 2-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922133865.6U CN211360920U (en) | 2019-12-03 | 2019-12-03 | Multi-head diameter-increasing worm gear hob |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922133865.6U CN211360920U (en) | 2019-12-03 | 2019-12-03 | Multi-head diameter-increasing worm gear hob |
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| Publication Number | Publication Date |
|---|---|
| CN211360920U true CN211360920U (en) | 2020-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922133865.6U Active CN211360920U (en) | 2019-12-03 | 2019-12-03 | Multi-head diameter-increasing worm gear hob |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113275668A (en) * | 2021-05-17 | 2021-08-20 | 宁波夏拓智能科技有限公司 | Bidirectional hob, chamfering, groove milling and deburring method |
| WO2022116500A1 (en) * | 2020-12-01 | 2022-06-09 | 浙江上优刀具有限公司 | Worm gear hob capable of preventing chip attaching damage |
-
2019
- 2019-12-03 CN CN201922133865.6U patent/CN211360920U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022116500A1 (en) * | 2020-12-01 | 2022-06-09 | 浙江上优刀具有限公司 | Worm gear hob capable of preventing chip attaching damage |
| CN113275668A (en) * | 2021-05-17 | 2021-08-20 | 宁波夏拓智能科技有限公司 | Bidirectional hob, chamfering, groove milling and deburring method |
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