Shaft workpiece machining clamp for gear hobbing machine tool

Abstract

The utility model relates to the technical field of machine tools, in particular to a shaft workpiece machining clamp for a gear hobbing machine tool, which comprises a base, an outer barrel and an inner barrel which are coaxially arranged are arranged on the upper end face of the base, an annular piston cavity is formed between the inner barrel and the outer barrel, and a pressure transmitting hole is arranged at the bottom of the barrel wall of the inner barrel; the top of an inner cavity of the inner barrel is slidably and hermetically connected with a top column, a piston sleeve extending out of the piston cavity is slidably and hermetically connected into the piston cavity, a conical opening is formed in the top of the piston sleeve, a matched conical locking sleeve is placed in the conical opening, and the top of the conical locking sleeve extends out of the conical opening. The rotary cutting device has the advantages that the rotary cutting device is simple in structure and low in manufacturing and using cost, a shaft workpiece is overlapped with a central machining area of a machine tool by matching with a tip, and the rotary cutting operation of the shaft workpiece is more stable and reliable by clamping and fixing the shaft workpiece through an encircling structure.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tools, in particular to a shaft workpiece processing fixture used for a gear hobbing machine tool. Background Art

[0002] At present, when shaft workpieces are processed by gear hobbing machines, two types of fixtures are generally selected. One type uses two opposing pins to support and fix the rotating shaft. Although this type of fixture is low in cost, it is unstable during rotary cutting operations. The other type uses a three-jaw chuck. This type of fixture can stably fix the rotating shaft, but it needs to be equipped with a hydraulic drive device and needs to connect cumbersome hydraulic transmission pipelines, resulting in high equipment and usage costs. Summary of the invention

[0003] The purpose of the utility model is to address the defects of the prior art and to provide a shaft workpiece processing fixture for a gear hobbing machine tool. The fixture has a simple structure and low manufacturing and use costs. The shaft workpiece is overlapped with the center processing area of ​​the machine tool by cooperating with the center, and the shaft workpiece is clamped and fixed by an embracing structure to make the rotating cutting operation more stable and reliable.

[0004] The technical solution of the utility model is: a shaft workpiece processing fixture for a gear hobbing machine tool, comprising a base, an outer cylinder and an inner cylinder arranged coaxially on the upper end surface of the base, the inner cylinder is located at the bottom of the outer cylinder cavity, an annular piston cavity is formed between the inner cylinder and the outer cylinder, and a pressure transmission hole is provided at the bottom of the cylinder wall of the inner cylinder to connect the piston cavity with the inner cylinder cavity;

[0005] The top of the inner cavity of the inner cylinder is slidably and sealably connected with a top column, the piston cavity is slidably and sealably connected with a piston sleeve extending out of the piston cavity, and the cavities of the inner cylinder and the piston cavity are filled with hydraulic oil;

[0006] The top of the piston sleeve is provided with a conical opening, an adapted conical locking sleeve is placed in the conical opening, the top of the conical locking sleeve extends out from the conical opening, and the top of the outer cylinder is detachably connected with an annular end cover for limiting the conical locking sleeve;

[0007] The conical locking sleeve is provided with a group of slits around it, and the inner cavity can be elastically contracted when the outer side of the conical locking sleeve is subjected to force through the slits.

[0008] Preferably, the top of the top column is a pointed cone structure.

[0009] Preferably, a group of first annular grooves are provided on the outer peripheral surface of the piston sleeve, and a sealing ring is provided in the first annular groove.

[0010] Preferably, a group of second annular grooves are provided on the outer peripheral surface of the top column, and a sealing ring is provided in the second annular groove.

[0011] Preferably, a group of mounting holes are provided on the base.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The utility model cooperates with the top of the machine tool to fix the rotating shaft and overlap with the central processing area of ​​the machine tool, and the rotating shaft is clamped and fixed by the embracing structure to make the rotary cutting operation more stable and reliable.

[0014] Compared with the traditional three-jaw chuck, the utility model has a simple structure and does not need to be used with a hydraulic drive device or the complicated operation of connecting external pipelines, and the equipment cost and the use cost are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the utility model in a half-section state;

[0017] Figure 3 It is a schematic diagram of the structure of a tapered locking sleeve;

[0018] Figure 4 This is a schematic diagram of the use state of the utility model;

[0019] In the figure: 1, annular end cover, 2, outer cylinder, 3, base, 4, mounting hole, 5, piston sleeve, 6, inner cylinder, 7, conical locking sleeve, 8, ejector column, 9, first ring groove, 10, second ring groove, 11, piston chamber, 12, pressure transmission hole, 13, slit, 14, ejector pin, 15, rotating shaft. DETAILED DESCRIPTION

[0020] The utility model is further described below with reference to the accompanying drawings and embodiments. Example 1

[0021] like Figures 1 to 3 A shaft workpiece processing fixture for a gear hobbing machine comprises a disc-shaped base 3, on which a group of mounting holes 4 are provided, and the base 3 can be fixed on the gear hobbing machine by inserting bolts into the mounting holes 4.

[0022] The upper end surface of the base 3 is provided with a coaxially arranged outer cylinder 2 and inner cylinder 6, the inner cylinder 6 is located at the bottom of the cavity of the outer cylinder 2, an annular piston cavity 11 is formed between the inner cylinder 6 and the outer cylinder 2, and the bottom of the cylinder wall of the inner cylinder 6 is provided with a pressure transmission hole 12 that connects the piston cavity 11 and the inner cavity of the inner cylinder 6.

[0023] A top column 8 is slidably and sealably connected to the top of the inner cavity of the inner cylinder 6, a piston sleeve 5 extending out of the piston cavity 11 is slidably and sealably connected to the piston cavity 11, and the cavities of the inner cylinder 6 and the piston cavity 11 are filled with hydraulic oil.

[0024] A conical opening is provided at the top of the piston sleeve 5, and an adapted conical locking sleeve 7 is placed in the conical opening of the piston sleeve 5. The top of the conical locking sleeve 7 extends out from the conical opening, and an annular end cover 1 for limiting the conical locking sleeve 7 is detachably connected to the top of the outer cylinder 2.

[0025] like Figure 3 A group of slits 13 are formed around the conical locking sleeve 7. The slits 13 are divided into two types, one of which is extended downward from the top of the conical locking sleeve 7, and the other is extended upward from the bottom of the conical locking sleeve 7.

[0026] The slits 13 cause the outer side of the conical locking sleeve 7 to deform when a force is applied, so that the inner cavity can shrink elastically.

[0027] Working principle:

[0028] like Figure 4 When in use, the base 3 is fixed on the tailstock of the gear hobbing machine, and the conical locking sleeve 7 is coaxially arranged with the ejector pin 14 on the gear hobbing machine;

[0029] Then insert the rotating shaft 15 to be processed into the conical locking sleeve 7 from the annular end cover 1, and the other end is pushed on the ejector pin 14, and then the ejector pin 14 is driven to extend through the rotating shaft 15 to push the ejector column 8 to move inward;

[0030] When the push column 8 moves, the hydraulic oil in the inner cylinder 6 is squeezed into the piston cavity 11 from the pressure transmission hole 12, thereby driving the piston sleeve 5 to move outward, and applying pressure to the outside of the conical locking sleeve 7 through the slope surface on the top of the piston sleeve 5, so that the inner cavity of the conical locking sleeve 7 elastically contracts, thereby clamping the rotating shaft 15.

[0031] After the operation is completed, the ejector pin 14 is controlled to retract, and the conical locking sleeve 7 is elastically reset to release the clamping of the rotating shaft 15.

[0032] The cooperation between the utility model and the center of the machine tool can make the rotating shaft 15 overlap with the central processing area of ​​the machine tool, and the rotating shaft 15 is clamped and fixed by the embracing structure to make the rotary cutting operation more stable and reliable.

[0033] Compared with the traditional three-jaw chuck, the utility model has a simple structure, does not need to be used with a hydraulic drive device, and does not require complicated operations of connecting external pipelines, and has low manufacturing and use costs. Example 2

[0034] This embodiment is further optimized on the basis of the above embodiment, specifically:

[0035] The outer edge of the top column 8 can be designed to be a pointed cone structure, so that it can be positioned in coordination with the rotating shaft 15 with a positioning hole at the end.

[0036] A group of first annular grooves 9 are provided on the outer circumference of the piston sleeve 5, and a sealing ring is provided in the first annular groove 9. A group of second annular grooves 10 are provided on the outer circumference of the top column 8, and a sealing ring is provided in the second annular groove 10. The sealing ring plays a sealing role during sliding cooperation.

[0037] The present invention is not limited to the above-mentioned implementation modes. Within the knowledge scope of those skilled in the art, various changes can be made without departing from the purpose of the present invention. The changed contents still belong to the protection scope of the present invention.

Claims

1. A shaft workpiece processing fixture for a gear hobbing machine tool, comprising a base, characterized in that: The upper end surface of the base is provided with a coaxially arranged outer cylinder and inner cylinder, the inner cylinder is located at the bottom of the outer cylinder cavity, an annular piston cavity is formed between the inner cylinder and the outer cylinder, and the bottom of the cylinder wall of the inner cylinder is provided with a pressure transmission hole connecting the piston cavity and the inner cylinder cavity; The top of the inner cavity of the inner cylinder is slidably and sealably connected with a top column, the piston cavity is slidably and sealably connected with a piston sleeve extending out of the piston cavity, and the cavities of the inner cylinder and the piston cavity are filled with hydraulic oil; The top of the piston sleeve is provided with a conical opening, an adapted conical locking sleeve is placed in the conical opening, the top of the conical locking sleeve extends out from the conical opening, and the top of the outer cylinder is detachably connected with an annular end cover for limiting the conical locking sleeve; The conical locking sleeve is provided with a group of slits around it, and the inner cavity can be elastically contracted when the outer side of the conical locking sleeve is subjected to force through the slits.

2. The shaft workpiece processing fixture for a gear hobbing machine tool according to claim 1, characterized in that: The top of the top column is in a pointed cone structure.

3. The shaft workpiece processing fixture for a gear hobbing machine tool according to claim 1, characterized in that: A group of first annular grooves are arranged on the outer peripheral surface of the piston sleeve, and a sealing ring is arranged in the first annular groove.

4. The shaft workpiece processing fixture for a gear hobbing machine tool according to claim 1, characterized in that: A group of second annular grooves are arranged on the outer peripheral surface of the top column, and a sealing ring is arranged in the second annular groove.

5. The shaft workpiece processing fixture for a gear hobbing machine tool according to claim 1, characterized in that: A group of mounting holes is arranged on the base.

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