Thin-wall inner gear ring gear turning clamp

Abstract

A thin-wall inner gear ring gear turning clamp comprises a bottom plate, a shell, a pull rod, a tie bar, a gear ring supporting seat, an expansion sleeve, a pressing head and the like, outer circle clamping and centering are achieved through the expansion sleeve, meanwhile, clamping force is small, deformation of a gear ring caused by large clamping force is reduced, a hydraulic system of a machine tool is adopted for driving the pressing head to achieve end face pressing, the clamping force is large, and workpiece fixing rigidity is good. The gear ring can resist cutting force generated by a gear turning cutter and is not prone to loosening, meanwhile, the machining precision is greatly improved and can reach the national standard sixth-level precision, the cylindricity of the outer circle of a part can be controlled within 0.01 mm, the assembly precision of the gear ring is improved, and the service life of the gear ring is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fixture, especially the technical field of new energy axle gear ring machining fixture. BACKGROUND

[0002] With the wide popularity of new energy commercial vehicles, the demand for motor integrated drive axle increases, and the electric drive axle pursues light weight and low noise, so higher requirements on the reliability, precision and weight of the inner gear ring, an internal key part of the electric drive axle, are required, which requires the gear ring to be subjected to nitriding heat treatment to increase the gear contact fatigue and bending fatigue strength, and at the same time, the wall thickness is as thin as possible to reduce the weight of the part under the condition of meeting the strength. Figure 1 As shown in the figure, the thin-walled part usually has an inner hole diameter d greater than 150mm and a wall thickness t less than 15mm. Considering the machining efficiency, cost and inner tooth precision, gear machining has many advantages and is widely used in inner gear ring machining. Since the inner gear ring is usually thin-walled, clamping deformation and heat treatment deformation cannot be avoided during gear machining, which requires us to improve the machining precision of the inner tooth and reduce the clamping force. The existing gear machine fixture mainly clamps the outer circle through 6 points, and the clamping force is small, which is easy to cause the part to loosen and cause the tool to break, and the clamping force is large, which is easy to cause clamping deformation, and the machined inner tooth precision, workpiece outer circle cylindricity and heat treatment deformation are large, the gear precision is more than 8 levels, which cannot meet the use requirements. CONTENT OF THE UTILITY MODEL

[0003] The utility model provides a kind of gear machine thin-walled inner gear ring special vehicle fixture, adopts small clamping force clamping centering of outer circle, end face pressure head is pressed, solve the technical problems such as thin-walled inner gear ring clamping easy deformation and low machining precision.

[0004] The utility model discloses a technology scheme for realizing the above-mentioned purpose is: thin wall inner gear ring gear clamping fixture, install the casing 6 on the bottom plate 15, install the supporting plate 12 on the casing 6 and the top of bottom plate 15, and the center hole of supporting plate 12 and bottom plate 15 is installed through the pull bar 20, and the upper portion of pull bar 20 is installed with the taper surface cooperation of supporting plate 12, and the upper side center of supporting plate 12 is fixedly installed with the pad iron 16, and the lower side of pad iron 16 is installed with the upper surface plane cooperation of pull bar 20, and two pull rods 4 are installed symmetrically through the casing 6, and the lower end of pull rod 4 is fixedly installed on supporting plate 12, and the upper end of pull rod 4 is installed with the pressure head 1, and the horizontal casing inner plate 29 is symmetrically arranged in the inside of casing 6, and the fixed disc 10 is arranged on the lower side of casing inner plate 29, and the fixed disc 10 is located above pad iron 16, and the spring 22 is installed in the spring positioning hole of the lower side of casing inner plate 29 and the upper side of fixed disc 10, and the guide column 8 is symmetrically installed on the fixed disc 10, and the upper portion of guide column 8 is installed with the expansion sleeve support seat 26, and the upper portion of expansion sleeve support seat 26 is installed with the expansion sleeve 3, and the expansion sleeve 3 is installed with the taper surface cooperation of casing 6, and the gear ring support seat 5 is installed in the inside of casing inner plate 29 and expansion sleeve support seat 26, and the guide groove 27 is arranged on pull rod 4, and the guide bolt 7 is installed transversely on the casing 6 and is matched with the guide groove 27.

[0005] The lower side of the inside end aperture of casing inner plate 29 is provided with the pressing pad 23 matched with the lower surface plane of casing inner plate 29, and the pressing pad 23 is fixedly connected with the gear ring support seat 5 through the seventh bolt 24.

[0006] The guide pad 18 is fixedly installed on the bottom plate 15 and located outside the pull bar 20 through the fifth bolt 19.

[0007] The fixed disc 10, the guide column 8 and the expansion sleeve support seat 26 are fixedly connected through the second bolt 9.

[0008] The casing 6 is provided with the chip removal hole 28.

[0009] The thin wall inner gear ring gear clamping fixture of the utility model, through the outer circle clamping centering, the clamping force is small, the deformation of gear ring caused by the big clamping force is reduced, the hydraulic system end face of machine tool is pressed, the clamping force is big, the workpiece fixed rigidity is good, can resist the cutting force produced by gear cutting tool, is not easy to loosen, and the machining precision is also greatly improved, can reach the national standard 6 level precision, the part outer circle cylindricity can be controlled within 0.01mm, improves the assembly precision and service life of gear ring. DRAWINGS

[0010] Figure 1 It is the thin wall gear ring plan view.

[0011] Figure 2 It is the thin wall inner gear ring gear clamping fixture main view of the utility model.

[0012] In the figure: pressure head 1, first bolt 2, expansion sleeve 3, pull rod 4, gear ring support seat 5, shell 6, guide bolt 7, guide column 8, second bolt 9, fixed disc 10, gasket 11, supporting plate 12, third bolt 13, nut 14, bottom plate 15, pad iron 16, fourth bolt 17, guide pad 18, fifth bolt 19, pull bar 20, sixth bolt 21, spring 22, compression pad 23, seventh bolt 24, gear ring 25, expansion sleeve support seat 26, guide groove 27, chip removal hole 28, shell inner plate 29. DETAILED DESCRIPTION

[0013] The thin-wall inner gear ring gear clamping jig of the utility model is shown as follows: Figure 2 The shell 6 is installed on the bottom plate 15, the supporting plate 12 is installed above the bottom plate 15 in the shell 6, the pull bar 20 is installed in the central hole of the supporting plate 12 and the bottom plate 15, the guide pad 18 is fixedly installed on the bottom plate 15 outside the pull bar 20 through the fifth bolt 19, the pull bar 20 upper portion is installed in cooperation with the conical surface of the supporting plate 12, the pad iron 16 is fixedly installed at the central position of the upper side of the supporting plate 12, and the pad iron 16 lower side is installed in cooperation with the upper surface plane of the pull bar 20; two pull rods 4 are symmetrically installed in the longitudinal direction through the shell 6, the lower end of the pull rod 4 is fixedly installed on the supporting plate 12, and the upper end of the pull rod 4 is installed with the pressure head 1; the horizontal shell inner plate 29 is symmetrically arranged on the inner side of the shell 6, the fixed disc 10 is arranged on the lower side of the shell inner plate 29, the fixed disc 10 is located above the pad iron 16, the spring 22 is installed in the spring positioning hole arranged on the upper side of the shell inner plate 29 and the lower side of the fixed disc 10 in a corresponding mode; the guide column 8 is symmetrically installed on the fixed disc 10, the expansion sleeve support seat 26 is installed on the upper portion of the guide column 8, the expansion sleeve 3 is installed on the upper portion of the expansion sleeve support seat 26, and the expansion sleeve 3 is installed in cooperation with the conical surface of the shell 6; the gear ring support seat 5 is installed on the inner side of the shell inner plate 29 and the expansion sleeve support seat 26; the guide groove 27 is arranged on the pull rod 4, and the guide bolt 7 is transversely installed on the shell 6 in a matching mode with the guide groove 27. The compression pad 23 that cooperates with the lower surface plane of the shell inner plate 29 is arranged below the inner end hole gap of the shell inner plate 29, and the compression pad 23 is fixedly connected with the gear ring support seat 5 through the seventh bolt 24. The chip removal hole 28 is arranged on the shell 6.

[0014] In use, the clamping body is fixed on the workbench of the gear turning machine through the bottom plate 15 and the third bolt 13, the pull bar 20 of the gear turning clamping body is connected with the hydraulic system of the machine tool, and the pull bar 20 is controlled to move up and down through the machine tool hydraulic system.

[0015] When installing, first install the four springs 22 in the four spring positioning holes of the housing 6 and the four spring positioning holes of the housing inner plate 29, then fix the four expansion sleeve support seats 26, the guide column 8 and the fixed disc 10 together through the four second bolts 9, and at the same time, the one end of the spring 22 that leaks out is installed in the spring positioning hole of the fixed disc 10. Under the action of the spring tension, the fixed disc 10, the guide column 8 and the expansion sleeve 3 are driven to move downwards, the expansion sleeve 3 is contracted and clamped in cooperation with the taper surface of the housing 6, and the gear ring can be centered.

[0016] Insert the two pull rods 4 into the housing 6, and at the same time, the upper end is fixed with the pressing head 1 on the pull rod 4 through the first bolt 2. The guide bolt 7 is arranged on the side surface of the housing 6, and the guide bolt 7 is screwed into the guide groove 27 of the pull rod 4. When the pull rod 4 moves up and down, the guide bolt 7 slides in the guide groove 27, so that the pull rod 4 can be rotated by 90°. When the pressing head 1 is turned above the gear ring 25 and pulled down at the same time, the end surface pressing function of the gear ring 25 can be realized. When the pressing head 1 is turned away from the gear ring 25, the space above the upper expansion sleeve 3 is emptied, and the gear ring 25 can be put into the expansion sleeve 3.

[0017] The gusset iron 16 and the supporting plate 12 are connected together through the fourth bolt 17, and the bolt hole of the supporting plate 12 is connected together through the gasket 11 and the nut 14, which forms an integral whole. When the pull bar 20 moves upwards, the pull bar 20 cooperates with the plane of the gusset iron 16, drives the supporting plate 12 and the two pull rods 4 to move upwards, and under the action of the guide bolt 7, the pressing head is turned away from the gear ring, so that the space above is emptied and the gear ring can be put into the expansion sleeve. At the same time, the upper end surface of the gusset iron 16 pushes the lower end surface of the fixed disc 10 to move upwards, and at the same time, the spring 22 is compressed, so that the fixed disc 10, the guide column 8 and the expansion sleeve 3 are driven to move upwards. The expansion sleeve 3 is expanded under the rubber expansion force, the inner hole diameter of the expansion sleeve is greater than the outer diameter of the gear ring by 0.1 mm, so that the gear ring can be freely put into the expansion sleeve. When the pull bar 20 moves downwards, the upper end surface of the gusset iron 16 is separated from the lower end surface of the fixed disc 10, and under the action of the spring tension, the guide column 8 and the expansion sleeve 3 are driven to move downwards. The expansion sleeve 3 is contracted and clamped in cooperation with the taper surface of the housing 6, so that the gear ring 25 can be clamped and centered. Since the clamping force is only affected by the spring force, the spring force can be adjusted to realize smaller clamping deformation. When the pull bar 20 further moves downwards, the pull bar 20 cooperates with the taper surface of the supporting plate 12 to drive the two pull rods to move downwards, and under the action of the guide bolt 7, the pressing head is turned above the gear ring, and then the upper end surface of the gear ring 25 is pressed.

[0018] The shell 6 is fastened to the bottom plate 15 by four bolts 21, and the bottom plate 15 is fixed to the worktable of the gear turning machine by six bolts 13 to realize the fixing and positioning functions of the whole fixture. The shell 6 and the support seat 5 are provided with a discharge hole, which can realize the rapid discharge of the iron chips generated during the gear turning machining under the flushing of the cooling liquid, and prevent the iron chips from being clamped on the tooth surface and affecting the machining precision of the tooth surface.

[0019] The guide pad 18 is fastened to the bottom plate 15 by four bolts 19, and the pull rod 20 is matched with the inner hole of the guide pad 18 to realize the positioning and guiding functions by moving up and down. The lower threaded part of the pull rod 20 is matched with the hydraulic system of the machine tool to control the up and down movement of the pull rod through the hydraulic system of the machine tool.

Claims

1. A thin-walled ring gear tooth forming fixture, characterized in that: The shell (6) is installed on the bottom plate (15), the supporting plate (12) is installed above the bottom plate (15) in the shell (6), the center hole of the supporting plate (12) and the bottom plate (15) is penetrated by the tension bar (20), the upper part of the tension bar (20) is installed in cooperation with the taper surface of the supporting plate (12), the center of the upper side of the supporting plate (12) is fixedly installed with the pad iron (16), the lower side of the pad iron (16) is installed in cooperation with the upper surface of the tension bar (20); two tension rods (4) are symmetrically installed through the shell (6) in the longitudinal direction, the lower end of the tension rod (4) is fixedly installed on the supporting plate (12), and the upper end of the tension rod (4) is installed with the pressure head (1); the horizontal inner plate (29) of the shell is symmetrically arranged in the shell (6), the lower side of the inner plate (29) of the shell is provided with the fixed disc (10), the fixed disc (10) is located above the pad iron (16), the spring (22) is installed in the spring positioning hole arranged on the upper side of the fixed disc (10) and corresponding to the lower side of the inner plate (29) of the shell; the guide column (8) is symmetrically installed on the fixed disc (10), the upper part of the guide column (8) is installed with the expansion sleeve support seat (26), the upper part of the expansion sleeve support seat (26) is installed with the expansion sleeve (3), and the expansion sleeve (3) is installed in cooperation with the taper surface of the shell (6); the inner plate (29) of the shell and the expansion sleeve support seat (26) are installed with the gear ring support seat (5); the guide groove (27) is arranged on the tension rod (4), and the guide bolt (7) is transversely installed on the shell (6) and matched with the guide groove (27).

2. The thin wall ring gear tooth vehicle tooth fixture of claim 1 wherein: The inner end aperture of the inner plate (29) of the shell is provided below with the pressing pad (23) matched with the lower surface of the inner plate (29) of the shell, and the pressing pad (23) and the gear ring support seat (5) are fixedly connected through the seventh bolt (24).

3. The thin wall ring gear tooth vehicle tooth fixture of claim 1 wherein: The guide pad (18) is fixedly installed on the outer side of the tension bar (20) on the bottom plate (15) through the fifth bolt (19).

4. The thin wall ring gear tooth vehicle tooth fixture of claim 1 wherein: The fixed disc (10), the guide column (8) and the expansion sleeve support seat (26) are fixedly connected through the second bolt (9).

5. The thin wall ring gear tooth vehicle tooth fixture of claim 1 wherein: The shell (6) is provided with the chip removal hole (28).

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