CN203804343U - Self-centering tool clamp used for hobbing worm wheel - Google Patents

Abstract

The utility model relates to a self-centering tool clamp used for hobbing a worm wheel. A centering shaft and a support seat which is located outside the centering shaft are coaxially fixed to a workbench; the upper part of the hollow centering shaft is conical; an expansion centering taper sleeve which is matched with the conical shape of the centering shaft sleeves the upper part of the centering shaft; a pull rod is arranged in the middle of the expansion centering taper sleeve; the pull rod penetrates through the centering shaft to stretch to the lower side of the workbench. The self-centering tool clamp has the advantages that the tool clamp is simple in structure and lower in manufacturing cost; the worm wheel can be very conveniently clamped and detached by adopting the tool clamp, a lot of time is saved, the installing and clamping efficiencies of the worm wheel are effectively improved, in addition, the self-centering is realized, the positioning is accurate and the stability is high when the worm wheel is mounted and clamped, and the processing efficiency of the worm wheel is greatly improved.

Description

Self-centering fixture for worm gear hobbing

technical field

The utility model relates to an auxiliary device for processing worm gears, in particular to a self-centering fixture for processing worm gears on a hobbing machine. the

Background technique

When the worm gear is processed on the gear hobbing machine, the worm gear needs to be clamped on the machine table first, and the worm gear is additionally rotated by the machine table. The hob rotates under the drive of the main shaft and is located outside the worm gear for axial feeding, and the worm gear is hobbed. . In order to improve the machining accuracy of worm gears, it is necessary to ensure the fixity of worm gears during machining. For this reason, technicians in the industry have made a lot of efforts in worm gear clamping devices. CN 202742092U discloses a worm wheel finishing tooling with a tensioning device, which includes a workbench body, the center of the workbench body is provided with a positioning boss, and the positioning boss forms a taper from the top to the bottom, and the positioning boss The tension sleeve is matched with the tension sleeve, and the upper part of the tension sleeve is provided with a pressure plate. The adjustment screw can adjust the connection of the pressure plate, tension sleeve and positioning boss in turn, and the tension degree of the tension sleeve on the inner wall of the worm wheel is controlled by the adjustment screw. The worm gear is fixed, but there are several problems in the worm gear finishing tooling: 1. The structure of the device is relatively complicated. After turning the adjusting screw to clamp and process, then loosen the adjusting screw to peel the worm gear off the device. The clamping and dismounting operations are very difficult. Convenient; 2. When adjusting the screw, the tension sleeve between the pressure plates is easy to be eccentric, resulting in poor centering of the worm gear outside the tension sleeve, which seriously affects the processing of the worm gear. the

Utility model content

Design purpose: To avoid the deficiencies in the background technology, to design a self-centering fixture for worm gear hobbing, which has a simple structure and easy operation, and improves the positioning and stability of the worm gear clamping. the

Design scheme: In order to achieve the above design purpose. 1. The design of the centering shaft and the expansion centering taper sleeve matched with its upper part is the first technical characterictic of the present utility model. The purpose of this design is that the hollow centering shaft is fixed in the middle of the workbench and the upper part of the centering shaft is conical, the expansion centering taper sleeve is set on the upper part of the centering shaft and fits with the upper part of the centering shaft in a conical fit, and the worm gear is placed on the centering shaft. In addition to the expansion centering taper sleeve, the worm gear can be automatically centered through the combination of the centering shaft and the expansion centering taper sleeve, and the centering of the worm gear is firm, which avoids the radial runout of the worm gear during processing and effectively improves the processing of the worm gear. In addition, when the expansion centering taper sleeve is pulled down, the worm gear will be tightened and fixed, and the expansion centering taper sleeve can be pushed upward to release the worm gear. Clipping efficiency saves a lot of time. 2. The support seat coaxially fixed on the workbench with the centering shaft is the second technical characterictic of the present utility model. The purpose of this design is that after the worm gear sleeve is in the expansion centering taper sleeve, the bottom surface of the worm gear is supported and fixed by the support seat. The stability of the clamping improves the processing efficiency of the worm gear. the

Technical solution: A self-centering fixture for worm gear hobbing. The centering shaft and the support seat outside it are coaxially fixed on the workbench. The upper part of the hollow centering shaft is conical, and the upper part of the centering shaft is covered with a The expansion and centering taper sleeve matched with the taper, the middle part of the expansion and centering taper sleeve is provided with a pull rod and the pull rod passes through the centering shaft and extends to the bottom of the workbench. the

Preferably, the cross-section of the centering shaft is inverted T-shaped, and the bottom surface of the centering shaft is fixedly connected to the workbench through a plurality of bolts. the

Preferably, the cross-section of the support base is in an inverted T shape, and the bottom surface of the support base is fixedly connected to the workbench through a plurality of bolts. the

Compared with the background technology, the utility model has the advantages of simple structure and low manufacturing cost; second, it is very convenient to clamp and disassemble the worm gear, which saves a lot of time and effectively improves the clamping efficiency of the worm gear; third, it can automatically The centering and positioning are accurate and the stability is high, which greatly improves the processing efficiency of the worm gear. the

Description of drawings

Below in conjunction with accompanying drawing, technical solution of the utility model is further described. the

Accompanying drawing 1 is the structure schematic diagram of the self-centering fixture of the utility model worm gear hobbing. the

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. the

Refer to accompanying drawing 1. A self-centering fixture for worm gear hobbing, which includes a centering shaft 2, an expansion centering tapered sleeve 1 and a support seat 4; the cross-section of the centering shaft 2 is inverted T-shaped, and the centering shaft 2 is vertically fixed on The middle part of the workbench 5; the bottom of the centering shaft 2 is provided with a plurality of bolts fixedly connected with the workbench 5; the support seat 4 is coaxially arranged on the workbench 5 with the centering shaft 2, and the bottom of the support seat 4 It is fixed to the workbench 5 by a plurality of bolts; the upper part of the centering shaft 2 is conical, and its diameter gradually increases from top to bottom; The inner surface of the expansion and centering taper sleeve 1 is conical, and it is conically matched with the upper part of the centering shaft 2; the center of the expansion and centering taper sleeve 1 extends from top to bottom with a pull rod 6; A through hole 7 is opened in the middle of the mandrel 2 ; the tie rod 6 of the expanded centering taper sleeve 1 passes through the through hole 7 of the centering shaft 2 and extends below the workbench 5 . the

The worm gear 3 is set outside the expansion centering taper sleeve 1 and is located on the support seat 4. The support base 4 positions the bottom end face of the worm gear 3 to avoid the end face of the worm gear 3 from beating. At the same time, the centering shaft 2 is combined with a pair of expansion centering taper sleeves. The center of the worm gear 3 is positioned to avoid the radial runout of the worm gear 3; when clamping, the expansion centering taper sleeve 1 is pulled downward, and due to the action of the centering shaft 2 and the expansion centering taper sleeve 1, the worm gear 3 is expanded and followed The gear hobbing can be carried out by rotating the machine table 5; after the processing is completed, the expansion centering taper sleeve 1 is pushed upward, the worm wheel 3 is released, and the worm wheel 3 can be directly removed, and the loading and unloading operation is very convenient. the

What needs to be understood is: although the above-mentioned embodiments have done more detailed text descriptions to the design ideas of the present utility model, these text descriptions are only simple text descriptions to the design ideas of the present utility model, rather than limitations to the design ideas of the present utility model. Any combination, addition or modification that does not exceed the design concept of the present utility model falls within the protection scope of the present utility model. the

Claims (3)

1. A self-centering fixture for worm gear hobbing, characterized in that: the centering shaft (2) and the support seat (4) located outside it are coaxially fixed on the worktable (5), and the hollow centering shaft (2) The upper part is conical, and the upper part of the centering shaft (2) is covered with an expansion centering taper sleeve (1) matching its taper shape. The middle part of the expansion centering taper sleeve (1) is provided with a pull rod (6) and the pull rod (6) ) passes through the centering shaft (2) and extends below the workbench (5). 2. The self-centering fixture for worm gear hobbing according to claim 1, characterized in that: the centering shaft (2) has an inverted T-shaped section, and the bottom surface of the centering shaft (2) passes through multiple bolts and the worktable (5) Fixed connection. 3. The self-centering fixture for worm gear hobbing according to claim 1, characterized in that: the support seat (4) has an inverted T-shaped section, and the bottom surface of the support seat (4) is connected to the workbench (5) by a plurality of bolts ) fixed connection.