CN112091550A - Machining method of combined gear - Google Patents
Machining method of combined gear Download PDFInfo
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- CN112091550A CN112091550A CN202010976519.9A CN202010976519A CN112091550A CN 112091550 A CN112091550 A CN 112091550A CN 202010976519 A CN202010976519 A CN 202010976519A CN 112091550 A CN112091550 A CN 112091550A
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- gear
- teeth
- diameter
- cavity
- concave
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
Abstract
A method for processing a combined gear comprises the following steps of processing external teeth, and reserving an undeformed part between the top of the external teeth and the top of a gear blank; flattening the undeformed part into a round cake shape by cold extrusion; extruding the round cake-shaped body through cold extrusion to obtain a disc body, extruding a concave cavity at the top of the disc body, and extruding internal teeth on the inner wall of the concave cavity at the same time, so that the rotating center of the internal teeth and the rotating center of the external teeth are positioned on the same axis; processing a connecting concave part on the bottom surface of the concave cavity, so that the diameter of the connecting concave part is smaller than the diameter of the end part of the connecting shaft; one end of the connecting shaft is inserted and fixed in the connecting concave part of the gear body. The invention has the advantages that: the coaxiality of the inner teeth and the outer teeth is good, the abrasion of the inner teeth and the outer teeth can be reduced during transmission, and the service life of the combined gear is prolonged.
Description
Technical Field
The invention relates to the technical field of gear manufacturing, in particular to a method for processing a combined gear.
Background
The existing Chinese patent application with the application number of CN201810614544.5 named as 'an integral combined gear for a chef machine and a preparation method thereof' discloses an integral combined gear for the chef machine and a preparation method thereof, which comprises a circular ring base body; the outer circumference of the circular ring base body is provided with a spiral helical tooth structure; one end face of the circular ring base body is also provided with a first boss extending outwards, and the first boss is provided with a second boss extending outwards; the end surface of the second boss is also provided with a spiral bevel gear structure; and the inner center of the ring base body is also provided with an inner hole which extends to the first boss and the second boss, and the inner hole is also provided with a double-positioning key groove. The gear of the device is integrally formed, has high precision, low cost, simple structure and stable performance, and can be efficiently matched with the input worm and the rear-section output bevel gear. However, this method requires a high processing temperature and is costly, and therefore, the method is still to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for processing a combined gear, which has the advantages of high forming efficiency, high coaxiality of inner and outer teeth of a finished product and low manufacturing cost, aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the processing method of the combined gear is characterized in that: comprises the following steps of (a) carrying out,
firstly, a gear blank is subjected to cold extrusion through a die to process external teeth on the outer wall of the gear blank, and an undeformed part for manufacturing the internal teeth is reserved between the top of the external teeth and the top of the gear blank;
secondly, the gear blank body with the external teeth is subjected to cold extrusion through a die, and the undeformed part is flattened into a round cake shape;
thirdly, performing cold extrusion on the gear blank body for preparing the round cake-shaped body through a die to extrude the round cake-shaped body to prepare a disc body, extruding a concave cavity at the top of the disc body, and extruding internal teeth on the inner wall of the concave cavity at the same time, so that the rotating center of the internal teeth and the rotating center of the external teeth are positioned on the same axis;
machining a connecting concave part on the bottom surface of the concave cavity by machining the gear blank with the internal teeth through a lathe, and enabling the diameter of the connecting concave part to be smaller than the diameter of the end part of a connecting shaft for connecting a driving gear, namely finishing the manufacturing of a gear body of the combined gear;
and fifthly, inserting and fixing one end of the connecting shaft in the connecting concave part of the gear body to finish the manufacture of the combined gear.
As a modification, in the third step, when the circular cake-shaped body is extruded to make a disk body, a boss portion is extruded on the bottom surface of the disk body, and the diameter of the outer contour line corresponding to the external teeth is smaller than the diameter of the boss portion.
In a further improvement, the top edge and the bottom edge of the disk body are both right-angle edges formed by cold extrusion.
In the fourth step, a circular groove is machined on the bottom surface of the concave cavity through a lathe, and then a connecting concave part is machined on the bottom surface of the circular groove through the lathe.
And further improving, before the fifth step, respectively carburizing and quenching the gear body and the connecting shaft which are processed with the connecting concave parts, so that the surface hardness of the gear body and the connecting shaft reaches 700 HV.
In a further improvement, the bottom edge of the round cake-shaped body is an arc-shaped edge formed in cold extrusion.
As the improvement, the concrete structure of the gear body that makes in step four does be provided with internal tooth and external tooth on the gear body, the gear body by can with drive gear first transmission portion that links mutually, can with the second transmission portion that drive gear linked mutually and can constitute the connecting portion on the bearing with the gear body coupling, first transmission portion, second transmission portion and connecting portion are the integrative structure that cold extrusion formed the top of first transmission portion is provided with the cavity, the internal tooth distributes on the inner wall circumference of cavity can be fixed the concave part of being connected together with connecting axle one end interpolation on the bottom surface of cavity, the external tooth distributes on the outer wall circumference of second transmission portion, the center of rotation of internal tooth and the center of rotation of external tooth are located same axis, first transmission portion is the disc body, the cavity is located the top surface of the disc body, second transmission portion is the cylinder, the diameter of the cylinder is smaller than that of the disc body, and the connecting part is a second cylinder with a diameter smaller than that of the cylinder.
The improved structure is further improved in that the overlook projection of the connecting concave part is circular, and the diameter of the connecting concave part is 0.3-1 mm smaller than that of the end part of the connecting shaft.
In a further improvement, when one end of the connecting shaft is inserted and fixed in the connecting concave part, one end of the connecting shaft extends out of the top opening of the concave cavity.
Further improved, the height of the external teeth is larger than that of the internal teeth.
Compared with the prior art, the invention has the advantages that: the first transmission part, the second transmission part and the connecting part in the gear body manufactured by the invention are of an integrated structure formed by cold extrusion, the coaxiality of the inner teeth and the outer teeth is good, the transmission efficiency of the combined gear is improved, the abrasion of the inner teeth and the outer teeth can be reduced during transmission, and the service life of the combined gear is prolonged; the cold extrusion can improve the precision of the combined gear appearance and the yield through reasonable die design; the cold extrusion forming reduces the cutting amount of the gear blank, saves materials, correspondingly improves the processing efficiency and effectively reduces the processing cost. Because the internal tooth and the external tooth are in an integrally formed structure, the product has complete and smooth appearance and good strength, and the service life of the combined gear is further prolonged.
Drawings
FIG. 1 is a perspective view of an embodiment of the present invention;
FIG. 2 is an exploded view of the structure of FIG. 1;
FIG. 3 is a front perspective view of a gear blank in step one of the embodiments of the present invention;
FIG. 4 is a perspective view of FIG. 3 after processing at step one;
FIG. 5 is a perspective view of FIG. 4 after processing in step two;
FIG. 6 is a perspective view of FIG. 5 at another angle;
FIG. 7 is a perspective view of FIG. 5 after step three machining;
FIG. 8 is a perspective view of FIG. 7 at another angle;
FIG. 9 is a perspective view of FIG. 7 after step four machining;
FIG. 10 is a front elevational view of FIG. 9;
fig. 11 is a bottom view of fig. 9.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to 11, the method for processing a composite gear of the present embodiment includes the steps of,
firstly, cold extruding a gear blank 10 through a die to process external teeth 12 on the outer wall of the gear blank 10, and reserving an undeformed part 101 for manufacturing internal teeth 11 between the top of the external teeth 12 and the top of the gear blank 10;
secondly, the gear blank 10 with the external teeth 12 is subjected to cold extrusion through a die to flatten the undeformed part 101 into a round cake-shaped body 103;
thirdly, performing cold extrusion on the gear blank 10 for preparing the round cake-shaped body 103 through a die to extrude the round cake-shaped body 103 to prepare a disc body 14, extruding a concave cavity 13 at the top of the disc body 14, and extruding internal teeth 11 on the inner wall of the concave cavity 13 at the same time, so that the rotating center of the internal teeth 11 and the rotating center of the external teeth 12 are positioned on the same axis;
fourthly, machining the gear blank 10 with the internal teeth 11 by a lathe to machine a connecting concave part 132 on the bottom surface of the concave cavity 13, and making the diameter of the connecting concave part 132 smaller than the end part diameter of a connecting shaft 2 for connecting a driving gear, namely completing the manufacture of the gear body 1 of the combined gear;
and fifthly, inserting and fixing one end of the connecting shaft 2 into the connecting concave part 132 of the gear body 1 to finish the manufacture of the combined gear.
In the third step, when the circular cake-shaped body 103 is extruded to obtain the disk body 14, the boss portion 141 is extruded on the bottom surface of the disk body 14, and the diameter D of the outer contour line corresponding to the outer teeth is smaller than the boss portion diameter. The top edge and the bottom edge of the circular disk body 14 are both right-angle edges formed by cold extrusion.
In the fourth step, the circular groove 131 is machined on the bottom surface of the cavity 13 by a lathe, and the connecting recess 132 is machined on the bottom surface of the circular groove 131 by the lathe. The bottom edge of the circular cake-shaped body 103 is an arc-shaped edge formed during cold extrusion. The bottom of the gear blank 10 is provided with a connecting part C which can connect the gear body 1 to a bearing. Before the fifth step, the gear body 1 and the connecting shaft 2, in which the connecting recess 132 is formed, are carburized and quenched, respectively, so that the surface hardness of the gear body 1 and the connecting shaft 2 reaches 700 HV. The specific steps of lathe machining, the specific process flow of carburizing and quenching and the surface hardness detection flow belong to the known technology, and therefore, the detailed description is omitted.
The manufacturing of the dies adopted in the above steps belongs to the prior art, the specific shape of the forming cavity in the die is determined according to the forming effect of the parts in each step, the specific distribution method of the upper cavity and the lower cavity of the forming cavity in the die and the specific process of loading the gear blank 10 into each die for forming processing belong to the known technology, and therefore, the detailed description is omitted.
The specific structure of the gear body 1 manufactured in the fourth step is that the gear body 1 is provided with the internal teeth 11 and the external teeth 12, the gear body 1 consists of a first transmission part A which can be linked with the driving gear, a second transmission part B which can be linked with the driving gear and a connecting part C which can connect the gear body 1 on the bearing, the first transmission part A, the second transmission part B and the connecting part C are an integrated structure formed by cold extrusion, the top of the first transmission part A is provided with a concave cavity 13, the internal teeth 11 are distributed on the circumference of the inner wall of the concave cavity 13, a connecting concave part 132 which can be inserted and fixed with one end of the connecting shaft 2 is arranged on the bottom surface of the concave cavity 13, the external teeth 12 are distributed on the circumference of the outer wall of the second transmission part B, the rotation center of the internal teeth 11 and the rotation center of the external teeth 12 are positioned on the same axis, the first transmission part A is a disk body 14, the concave cavity 13 is positioned, the second transmission part B is a cylinder, the diameter of which is smaller than that of the disk body 14, and the connection part C is a second cylinder, the diameter of which is smaller than that of the cylinder. The planar projection of the connecting recess 132 is circular, and the diameter of the connecting recess 132 is 0.3-1 mm smaller than the diameter of the end of the connecting shaft 2. When one end of the connecting shaft 2 is inserted and fixed in the connecting recess 132, one end of the connecting shaft 2 protrudes out of the top opening of the cavity 13. The outer tooth height H is greater than the inner tooth height.
The working principle is as follows: the first transmission part, the second transmission part and the connecting part are of an integrated structure formed by cold extrusion, so that the internal teeth and the external teeth can keep good coaxiality, and the precision of the combined gear is correspondingly improved. The gear shaft assembly is formed by combining a gear body and a connecting shaft in an interference fit manner, wherein the gear body is produced by cold extrusion and machining, the internal teeth and the external teeth are both formed by cold extrusion, and the inner hole and the small end face are formed by machining. The gear body and the end part of the connecting shaft are combined together after carburization and quenching (the surface hardness can reach 700 HV).
When the gear is used, other components are assembled on the connecting shaft, and the components and the inner teeth of the gear body can transmit, so that the connecting shaft and the inner teeth of the gear body need to have good position;
through cold extrusion molding, the coaxiality of the inner teeth and the outer teeth is good, and the product precision is high; the combined gear has the advantages of less machining allowance, high machining efficiency and low machining cost; the inner teeth and the outer teeth are integrally formed, the metal streamline is complete, and the product strength is good.
Claims (10)
1. A machining method of a combined gear is characterized in that: comprises the following steps of (a) carrying out,
firstly, a gear blank (10) is subjected to cold extrusion through a die to process external teeth (12) on the outer wall of the gear blank (10), and an undeformed part (101) for manufacturing internal teeth (11) is reserved between the top of the external teeth (12) and the top of the gear blank (10);
secondly, the gear blank (10) with the external teeth (12) is subjected to cold extrusion through a die to flatten the undeformed part (101) into a round cake-shaped body (103);
thirdly, performing cold extrusion on the gear blank (10) for preparing the round cake-shaped body (103) through a die to extrude the round cake-shaped body (103) to prepare a disc body (14), simultaneously extruding a concave cavity (13) at the top of the disc body (14), and simultaneously extruding internal teeth (11) on the inner wall of the concave cavity (13) to enable the rotation center of the internal teeth (11) and the rotation center of the external teeth (12) to be positioned on the same axis;
fourthly, machining a connecting concave part (132) on the bottom surface of the concave cavity (13) by machining the gear blank (10) with the internal teeth (11) through a lathe, and enabling the diameter of the connecting concave part (132) to be smaller than the end part diameter of a connecting shaft (2) for connecting a driving gear, namely finishing the manufacture of the gear body (1) of the combination gear;
and fifthly, inserting and fixing one end of the connecting shaft (2) into the connecting concave part (132) of the gear body (1) to finish the manufacture of the combined gear.
2. The processing method according to claim 1, characterized in that: in the third step, when the round cake-shaped body (103) is extruded to obtain the disk body (14), a boss part (141) is extruded on the bottom surface of the disk body (14), and the diameter (D) of the outer contour line corresponding to the outer teeth is smaller than the diameter of the boss part.
3. The processing method according to claim 2, characterized in that: the top edge and the bottom edge of the disk body (14) are both right-angle edges formed by cold extrusion.
4. The processing method according to claim 2, characterized in that: in the fourth step, a circular groove (131) is machined on the bottom surface of the cavity (13) by a lathe, and then a connecting concave portion (132) is machined on the bottom surface of the circular groove (131) by the lathe.
5. The processing method according to claim 4, characterized in that: before the fifth step, the gear body (1) and the connecting shaft (2) which are processed with the connecting concave parts (132) are respectively carburized and quenched, so that the surface hardness of the gear body (1) and the surface hardness of the connecting shaft (2) reach 700 HV.
6. The processing method according to claim 1, characterized in that: the bottom edge of the round cake-shaped body (103) is an arc-shaped edge formed in cold extrusion.
7. The processing method according to any one of claims 1 to 6, characterized in that: the specific structure of the gear body (1) prepared in the fourth step is that internal teeth (11) and external teeth (12) are arranged on the gear body (1), the gear body (1) consists of a first transmission part (A) which can be linked with a driving gear, a second transmission part (B) which can be linked with a transmission gear and a connecting part (C) which can connect the gear body (1) on a bearing, the first transmission part (A), the second transmission part (B) and the connecting part (C) are of an integrated structure formed by cold extrusion, a cavity (13) is arranged at the top of the first transmission part (A), the internal teeth (11) are distributed on the circumference of the inner wall of the cavity (13), a connecting concave part (132) which is fixedly inserted and combined with one end of a connecting shaft (2) on the bottom surface of the cavity (13), and the external teeth (12) are distributed on the circumference of the outer wall of the second transmission part (B), the rotation center of internal tooth (11) and the rotation center of external tooth (12) are located same axis, first transmission portion (A) is the disc body (14), cavity (13) are located the top surface of the disc body (14), second transmission portion (B) is the cylinder, the diameter of cylinder is less than the diameter of the disc body (14), connecting portion (C) are the second cylinder that the diameter is less than the cylinder.
8. The process of claim 7, wherein: the overlook projection of the connecting concave part (132) is circular, and the diameter of the connecting concave part (132) is smaller than the diameter of the end part of the connecting shaft (2) by 0.3-1 mm.
9. The process of claim 7, wherein: when one end of the connecting shaft (2) is inserted and fixed in the connecting concave part (132), one end of the connecting shaft (2) extends out of the top opening of the concave cavity (13).
10. The process of claim 7, wherein: the outer tooth height (H) is greater than the inner tooth height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010976519.9A CN112091550A (en) | 2020-09-17 | 2020-09-17 | Machining method of combined gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010976519.9A CN112091550A (en) | 2020-09-17 | 2020-09-17 | Machining method of combined gear |
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| CN112091550A true CN112091550A (en) | 2020-12-18 |
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| US20150031499A1 (en) * | 2013-07-29 | 2015-01-29 | Ford Global Technologies, Llc | Drive hub for planet pinion carrier freeness check |
| CN105179450A (en) * | 2015-09-30 | 2015-12-23 | 江苏威鹰机械有限公司 | Production method of car transmission input axle hubs |
| CN107504156A (en) * | 2017-08-09 | 2017-12-22 | 江苏威鹰机械有限公司 | Farm tractor main clutch and its manufacturing process |
| CN108825752A (en) * | 2018-06-14 | 2018-11-16 | 扬州保来得科技实业有限公司 | A kind of monoblock type built-up gear and preparation method thereof for cook's machine |
| CN109175890A (en) * | 2018-08-20 | 2019-01-11 | 玉环加鑫汽车配件有限公司 | Electromagnetic clutch inner wheel hub manufacturing method |
| CN211501554U (en) * | 2020-01-11 | 2020-09-15 | 浙江东禾机电制造有限公司 | Gear for automobile seat angle adjuster |
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2020
- 2020-09-17 CN CN202010976519.9A patent/CN112091550A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1922419A (en) * | 2004-02-27 | 2007-02-28 | 丰田自动车株式会社 | Composite gear and method of manufacturing the same |
| US7364803B1 (en) * | 2004-07-14 | 2008-04-29 | Keystone Investment Corporation | High density dual helical gear and method for manufacture thereof |
| CN102873124A (en) * | 2012-10-20 | 2013-01-16 | 无锡市神力齿轮冷挤有限公司 | One-off forming device for making gear workpiece with internal and external teeth |
| CN202861030U (en) * | 2012-10-20 | 2013-04-10 | 无锡市神力齿轮冷挤有限公司 | One-time forming device for gear workpiece with inner and outer teeth |
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