CN212121960U

CN212121960U - Driven gear ring double-piece hobbing tool

Info

Publication number: CN212121960U
Application number: CN202020104778.8U
Authority: CN
Inventors: 王永明
Original assignee: Jiangyin Kaihua Machinery Manufacturing Co ltd
Current assignee: Jiangyin Kaihua Machinery Manufacturing Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-12-11
Anticipated expiration: 2030-01-17

Abstract

The utility model discloses a driven gear ring double-piece hobbing tool, which comprises an expansion mandrel in a stepped cylindrical shape, wherein the size of a shaft shoulder at the lower part of the expansion mandrel is larger than the bore diameter of a driven gear to be hobbed; the hobbing tool further comprises an anti-expansion sleeve matched with the upper end of the expansion mandrel, and the anti-expansion sleeve is arranged in the inner hole of the driven gear and is tightly matched with the inner hole of the driven gear after being sleeved on the expansion mandrel. The utility model provides a receive the clamp force and successively factor influence such as manufacturing procedure in the course of working the problem that the work piece is very easily out of shape, the cylindricity of hole diameter can reach higher requirement to also can reach higher pinhole position degree requirement. The two parts can be processed together, and the processing efficiency is improved.

Description

Driven gear ring double-piece hobbing tool

Technical Field

The utility model relates to a high-efficient high accuracy driven gear double-piece gear hobbing frock.

Background

The driven gear is a high-speed gear used on a traffic track. Therefore, the precision requirement is high, and the gear meshing backlash is controlled to be 0.251-0.563 mm (within 0.312 mm). The current general process route is as follows: blanking, rough turning, UT flaw detection, normalizing, semi-finish turning, gear hobbing, carburizing and quenching, finish turning, drilling and tapping, finish turning 2, finish grinding, gear grinding, magnetic particle inspection and final inspection; however, the processing period is long, the efficiency is low, the cost is high, and the requirements of customers cannot be met. Because the wall of the driven gear is thin, the radial rigidity is very weak, and the driven gear is very easy to deform in processing. The main technical requirements are the sizes of an inner hole and an outer circle, an inner hole step arc wall buckle and a circle of pin holes. The cylindricity requirement of the inner bore diameter is high, and the position requirement of the pin hole is relatively high. The machining process is easily deformed under the influence of factors such as clamping force, sequential machining procedures and the like, so that the technical requirements are difficult to guarantee. The current processing technology is as follows: the end face of the inner hole is semi-finish turned to keep the grinding amount, and the pin hole is directly drilled, so that the requirements on the position degree of the pin hole are difficult to guarantee due to the fact that factors such as deformation exist after heat treatment although the precision can be guaranteed. Finish turning end face location, excircle press from both sides tightly, carry out the finish machining, adopt high accuracy numerical control oil engine lathe during the finish machining, the performance is excellent, and the cutter apolegamy is also reasonable, considers simultaneously to use ordinary three-jaw can be because the clamping area is less to take place the factor of deformation, has designed primary and secondary to attach the claw alone, has increaseed area of contact, and whole work piece is all embraced basically, and the atress is even in theory, should not produce the deformation, what state adds man-hour, what state should be after the processing jack catch loosens. But the cylindricity of the actually processed inner hole is out of tolerance, and the requirement of the process is not ensured. It can be seen that cylindricity is the key of the workpiece, and how to control cylindricity is crucial.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a high-efficient high accuracy driven gear two-piece gear hobbing frock, solved and influenced the problem that the work piece is very easily out of shape by factors such as clamp force and successively manufacturing procedure in the course of working, the cylindricity of hole diameter can reach higher requirement to also can reach higher pinhole position degree requirement. The two parts can be processed together, and the processing efficiency is improved.

In order to achieve the purpose, the technical scheme of the utility model is to design a driven gear ring two-piece hobbing tool, which comprises an expansion mandrel in a stepped cylindrical shape, wherein the size of a shaft shoulder at the lower part of the expansion mandrel is larger than the bore diameter of a driven gear to be hobbed; the hobbing tool further comprises an anti-expansion sleeve matched with the upper end of the expansion mandrel, and the anti-expansion sleeve is arranged in the inner hole of the driven gear and is tightly matched with the inner hole of the driven gear after being sleeved on the expansion mandrel. Because the hobbing procedure is between the semi-finish turning procedure and the finish turning procedure, the inner hole in the shaft shoulder at the lower part of the expansion mandrel, which is larger than the inner hole aperture of the driven gear to be hobbed, refers to the hole after the semi-finish turning (namely the inner hole is a cylindrical hole). The circumference of the workpiece is uniformly stressed, and the cylindricity of the inner hole is ensured. Meanwhile, the position degree of the pin hole can be ensured by drilling the pin hole. Adopt the utility model discloses can two process together in the time of gear hobbing clamping, improve the efficiency of processing.

The further technical scheme is that the expansion-proof sleeve comprises two parts, wherein the first part is in a circular groove shape, the second part is in a ring shape, and the thickness of the second part is equal to that of the two driven gears; the expansion mandrel comprises an upper end, a middle section and a shaft shoulder which are sequentially arranged from top to bottom; the first part of the expansion-proof sleeve is sleeved at the upper end of the expansion mandrel, the second part of the expansion-proof sleeve is sleeved on the middle section, and the second part is positioned at the inner hole of the two superposed driven gears. The expansion mandrel is sleeved with the gasket and then sleeved with the second part of the anti-expansion sleeve, the expansion mandrel is inserted into the inner holes of the two parts from bottom to top until the gasket abuts against the lower end face of the part below, then the first part of the anti-expansion sleeve is sleeved at the upper end of the expansion mandrel until the lower end face of the first part of the anti-expansion sleeve abuts against the upper end face of the part above, so that the parts are tightly abutted by the expansion mandrel and the anti-expansion sleeve during hobbing, and the problem that workpieces are easily deformed due to factors such as clamping force, machining procedures and the like during hobbing can be solved.

A further technical scheme is that an annular gasket is arranged above the shaft shoulder, one end of the gasket is abutted against the end face of the shaft shoulder, and the other end of the gasket is abutted against the end face of the driven gear.

The expansion core shaft is in a multi-step cylindrical shape from top to bottom, and the size of the expansion core shaft is larger and larger from top to bottom; the second part of the expansion-preventing sleeve comprises a base ring, wherein an annular groove concentric with the base ring is formed in the base ring, a pair of annular grooves is formed in each annular groove and is respectively formed in the upper end face and the lower end face of the base ring, an annular plug-in is matched with the annular groove, a connecting ring larger than the annular plug-in size is further integrally connected to the upper end of the annular plug-in, an annular expansion sleeve is integrally arranged on the outer edge of the connecting ring, the annular plug-in, the connecting ring and the annular expansion sleeve are concentrically arranged, and the height of the. The part homoenergetic that can make different thickness through the setting of annular extension cover adopts this cover of preventing rising to realize that the hole is propped the problem of the deformation that prevents the hobbing man-hour with reaching man-hour, has improved the utility model discloses an adaptability.

The second part of the expansion-proof sleeve, the annular expansion sleeve and the annular plug-in are provided with longitudinal pressure relief grooves. The setting of pressure release groove can guarantee that the second part of preventing the cover that rises overlaps easily on the inflation dabber, in the annular groove of annular plug-in components easy insertion base ring, can also guarantee that annular extension cover overlaps easily outside the base ring and be in the inner bore.

The improvement on the process comprises the following steps: and during semi-finish turning, the verticality between the end face and the inner hole is ensured to be within 0.05mm, and during finish turning, the end face is firstly polished to be positioned. Besides, the original primary and secondary claws are not used, and the integral auxiliary claw is adopted. The circumferential stress of the workpiece is uniform, and the cylindricity of the inner hole is ensured. Meanwhile, the position degree of the pin hole can be ensured by drilling the pin hole. Adopt the utility model discloses can two be processed together in the time of gear hobbing clamping, improved the efficiency of processing, the cooperation carries out profile modification and profile modification to the driving gear, carries out profile modification to driven gear, improves the transmission quality and the reliability of gear, dynamic load when reducing initial engagement, reduction unbalance loading, noise reduction.

The utility model has the advantages and the beneficial effects that: by improving the machining process and the tool clamp, the deformation of the thin wall during cold machining is reduced, and the requirement of a drawing is met. The circumference of the workpiece is uniformly stressed, and the cylindricity of the inner hole is ensured. Meanwhile, the position degree of the pin hole can be ensured by drilling the pin hole. Adopt the utility model discloses can two process together in the time of gear hobbing clamping, improve the efficiency of processing. The problem of receive the clamp force in the course of working and successively process factors influence the work piece very easily to warp is solved, and the cylindricity of hole diameter can reach higher requirement to also can reach higher pinhole position degree requirement. The two parts can be processed together, and the processing efficiency is improved. The part homoenergetic that can make different thickness through the setting of annular extension cover adopts this cover of preventing rising to realize that the hole is propped the problem of the deformation that prevents the hobbing man-hour with reaching man-hour, has improved the utility model discloses an adaptability. The setting of pressure release groove can guarantee that the second part of preventing the cover that rises overlaps easily on the inflation dabber, in the annular groove of annular plug-in components easy insertion base ring, can also guarantee that annular extension cover overlaps easily outside the base ring and be in the inner bore.

Drawings

Fig. 1 is a schematic view of a first embodiment of a high-efficiency high-precision driven gear double-piece hobbing tool of the present invention;

FIG. 2 is an exploded schematic view of FIG. 1;

fig. 3 is a schematic view of an expansion mandrel according to a second embodiment of the present invention;

FIG. 4 is an exploded view of the second part of the anti-expansion sleeve and the annular insert according to the second embodiment of the present invention;

fig. 5 is a cross-sectional view of fig. 4.

In the figure: 1. an expansion mandrel; 2. a shaft shoulder; 3. a driven gear; 4. a first portion; 5. a second portion; 6. an upper end; 7. a gasket; 8. an annular groove; 9. an annular insert; 10. a connecting ring; 11. an annular expansion sleeve.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The first embodiment is as follows:

as shown in fig. 1 to 2, the utility model relates to a high-efficiency high-precision driven gear two-piece hobbing tool, which comprises an expansion mandrel 1 in a stepped cylindrical shape, wherein the size of a shaft shoulder 2 at the lower part of the expansion mandrel 1 is larger than the inner hole aperture of a driven gear 3 to be hobbed; the hobbing tool further comprises an anti-expansion sleeve matched with the upper end 6 of the expansion mandrel 1, and the anti-expansion sleeve is arranged in the inner hole of the driven gear 3 and is tightly matched with the inner hole of the driven gear 3 after being sleeved on the expansion mandrel 1. The anti-expansion sleeve comprises two parts, wherein the first part 4 is in a circular groove shape, the second part 5 is in a ring shape, and the thickness of the second part 5 is the thickness of the two driven gears 3; the expansion mandrel 1 comprises an upper end 6, a middle section and a shaft shoulder 2 which are arranged from top to bottom in sequence; the first part 4 of the expansion-proof sleeve is sleeved at the upper end 6 of the expansion mandrel 1, the second part 5 of the expansion-proof sleeve is sleeved on the middle section, and the second part 5 is positioned at the inner hole of the two overlapped driven gears 3. An annular gasket 7 is arranged above the shaft shoulder 2, one end of the gasket 7 abuts against the end face of the shaft shoulder 2, and the other end of the gasket abuts against the end face of the driven gear 3.

Example two:

the difference from the first embodiment is that, as shown in fig. 3 to 5, the expansion mandrel 1 is in a multi-step cylindrical shape from top to bottom and has increasingly larger size from top to bottom; the second part 5 of the expansion-proof sleeve comprises a base ring, wherein an annular groove 8 concentric with the base ring is formed in the base ring, a pair of annular grooves 8 are formed in the annular groove 8 and are respectively formed in the upper end face and the lower end face of the base ring, an annular plug-in unit 9 is matched with the annular groove 8, a connecting ring 10 larger than the annular plug-in unit 9 in size is further integrally connected to the upper end of the annular plug-in unit 9, an annular expansion sleeve 11 is integrally arranged on the outer edge of the connecting ring 10, the annular plug-in unit 9, the connecting ring 10 and the annular expansion sleeve 11 are concentrically arranged, and. The second part 5 of the expansion-preventing sleeve, the annular expansion sleeve 11 and the annular insert 9 are provided with longitudinal pressure relief grooves (i.e. grooves parallel to the rotation axis of the annular insert are provided on the outer surface).

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The driven gear ring two-piece hobbing tool is characterized by comprising an expansion mandrel in a stepped cylindrical shape, wherein the size of a shaft shoulder at the lower part of the expansion mandrel is larger than the aperture of an inner hole of a driven gear to be hobbed; the hobbing tool further comprises an anti-expansion sleeve matched with the upper end of the expansion mandrel, and the anti-expansion sleeve is arranged in the inner hole of the driven gear and is tightly matched with the inner hole of the driven gear after being sleeved on the expansion mandrel.

2. The driven gear ring two-piece hobbing tool according to claim 1, wherein the anti-expansion sleeve comprises two parts, the first part is in a shape of a circular groove, the second part is in a shape of a ring, and the thickness of the second part is equal to that of the two driven gears; the expansion mandrel comprises an upper end, a middle section and a shaft shoulder which are sequentially arranged from top to bottom; the first part of the expansion-proof sleeve is sleeved at the upper end of the expansion mandrel, the second part of the expansion-proof sleeve is sleeved on the middle section, and the second part is positioned at the inner hole of the two superposed driven gears.

3. The driven gear ring two-piece hobbing tool according to claim 2, wherein an annular gasket is arranged above the shaft shoulder, one end of the gasket abuts against the end face of the shaft shoulder, and the other end of the gasket abuts against the end face of the driven gear.

4. The driven gear ring double-piece hobbing tool according to claim 3, wherein the expansion mandrel is in a multi-step cylindrical shape from top to bottom and is increasingly larger in size from top to bottom; the second part of the expansion-preventing sleeve comprises a base ring, wherein an annular groove concentric with the base ring is formed in the base ring, a pair of annular grooves is formed in each annular groove and is respectively formed in the upper end face and the lower end face of the base ring, an annular plug-in is matched with the annular groove, a connecting ring larger than the annular plug-in size is further integrally connected to the upper end of the annular plug-in, an annular expansion sleeve is integrally arranged on the outer edge of the connecting ring, the annular plug-in, the connecting ring and the annular expansion sleeve are concentrically arranged, and the height of the.

5. The driven gear ring two-piece hobbing tool according to claim 4, wherein the second part of the expansion-prevention sleeve, the annular expansion sleeve and the annular insert are provided with longitudinal pressure relief grooves.