CN204700390U - The numerical control gear-hobbing clamp of gear shaft - Google Patents

Abstract

The utility model relates to a numerically controlled gear hobbing fixture for a gear shaft, which comprises a base, a workpiece top, a spacer, a positioning seat, a pull sleeve, a taper sleeve and a clamping column. Cooperate with the base through the spigot and fixedly connect with the base through screws, and place an inverted taper sleeve and a limit plate on the top platform. The outer cylindrical surface of the pull sleeve cooperates with the inner hole of the positioning seat, and is rigidly connected with the pull rod through the spacer and the screw through the base. There are three evenly distributed circular holes on the upper end of the pull sleeve, and a belt is installed in each circular hole. Clamping columns with conical and cylindrical surfaces. The utility model relies on the top of the workpiece and the top of the tailstock of the machine tool to directly locate the workpiece, and transmits the power of the machine tool through the connection of the clamping column, the pull sleeve, the taper sleeve, the positioning seat, the base and the machine tool workbench, which greatly improves the reliability of the clamping. Replace the clamping column with different lengths to realize the processing of the same series of workpieces.

Description

CNC Hobbing Fixture for Gear Shaft

technical field

The utility model relates to the technical field of gear processing, in particular to a numerically controlled gear hobbing fixture for a gear shaft.

Background technique

Gear hobbing is a main processing method to obtain gears, and the gear shaft is a widely used gear transmission part. The subsequent finishing accuracy of the gear part depends on the hobbing accuracy to a certain extent. The gear hobbing accuracy mainly depends on the accuracy of the machine tool and the accuracy of the fixture. To ensure that if the precision of the fixture cannot be achieved, the hobbing accuracy of the gear shaft cannot be improved no matter how high the precision of the machine tool is , The weight is heavy, such as the use of the plum blossom tip, although it is simple and convenient to clamp, but for large-module shaft gear workpieces, it is necessary to use multi-tool hobbing to reduce the hobbing force to avoid wrong teeth or knife cutting, which is not suitable for processing economy The use of jacket-type fixtures has high centering accuracy, but the requirements for the runout of the clamping surface of the shaft teeth are correspondingly high. As we all know, for heavy and large-modulus shaft teeth, precision turning ensures high runout requirements for the clamping surface more difficult.

Contents of the invention

The purpose of this utility model is to overcome the above-mentioned defects, and provide a gear shaft numerical control gear hobbing fixture with simple structure, convenient use and high reliability.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical scheme: a digitally controlled gear hobbing fixture for a gear shaft, including a base 1, a workpiece tip 4, a spacer 3, a positioning seat 5, a pull sleeve 6, a taper sleeve 8 and a clamping Column 9, workpiece tip 4 is installed on the boss in the center of base 1; positioning seat 5 is positioned with base 1 through the seam and fixedly connected with base 1 through screws, and an inverted taper sleeve 8 is placed on the top platform and passed through The screw is fixedly connected with the limit plate 10; the outer cylindrical surface of the pull sleeve 6 is matched with the inner hole of the positioning seat 5, and the spacer 3 and the screw pass through the base 1 to rigidly connect with the pull rod 2. There are three uniformly distributed The circular holes of each circular hole are equipped with a clamping column 9 with a tapered surface and a cylindrical surface, and a cylindrical pin 7 is installed in the longitudinal hole of the clamping column 9. The inner tapered surface of the sleeve 8 is in contact, and the cylindrical surface of the other end is in contact with the outer cylindrical surface of the clamped workpiece.

As one of the preferred solutions, an anti-chip board 11 is installed on the top of the pull sleeve 6.

As one of the preferred solutions, there is a gap between the inner circular table surface of the limit plate 10 and the outer circular table surface of the taper sleeve 8.

The utility model relies on the top of the workpiece and the top of the tailstock of the machine tool to directly locate the workpiece, and transmits the movement of the main shaft of the machine tool through the connection of the clamping column, the pull sleeve, the taper sleeve, the positioning seat and the base and the machine tool workbench, so that the benchmark is unified, the error is reduced, The runout requirement of the clamping part is reduced, the reliability of the clamping is greatly improved, and the precision of the tooth part is improved. By replacing the clamping column with different lengths, the processing of the same series of workpieces can be realized.

Description of drawings

Fig. 1 is a schematic diagram of a longitudinal section structure of the utility model.

Fig. 2 is a partial enlarged view of the longitudinal section of the utility model.

Fig. 3 is a schematic diagram of a longitudinal section of the pull sleeve of the present invention.

Fig. 4 is a schematic longitudinal sectional view of the clamping column of the present invention.

In the figure: 1—base, 2—tie rod, 3—spacer sleeve, 4—top of workpiece, 5—positioning seat, 6—pull sleeve, 7—straight pin, 8—taper sleeve, 9—clamping column, 10—limit Bit plate, 11—chip plate, 12—the top of the tailstock of the machine tool.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model will be further described.

As shown in Figures 1 to 4, the CNC hobbing fixture of the gear shaft includes a base 1, a workpiece tip 4, a spacer 3, a positioning seat 5, a pull sleeve 6, a taper sleeve 8 and a clamping column 9, and the workpiece tip 4 is installed on the base 1 on the boss in the center; the positioning seat 5 is positioned with the base 1 through the seam to ensure that the inner cylindrical surface is concentric with the top 4 of the workpiece, and the positioning seat 5 is fixedly connected with the base 1 through screws; The taper sleeve 8 and the limiting disk 10 fixedly connected with it by screws.

The pull sleeve 6 is provided with a certain tapered surface to guide the workpiece to ensure that the top of the workpiece is pushed into the center hole of the lower end of the gear shaft workpiece, and its outer circular table is matched with the positioning seat 5 according to a matching gap, passing through the positioning seat 5 from the center through the spacer 3 and The screw is rigidly connected with the pull rod 2, so as to realize the connection between the pull sleeve and the oil cylinder of the machine tool. There are three evenly distributed circular holes on the upper end of the pull sleeve 6, and a clamping column 9 with a tapered surface and a cylindrical surface is installed in each circular hole, and a cylindrical pin is installed in the longitudinal hole of the clamping column 9. 7, used to limit its radial travel and rotation. The conical surface of the clamping column 9 is in contact with the inner conical surface of the taper sleeve 8, and the cylindrical surface at the other end is in contact with the outer cylindrical surface of the clamped workpiece.

An anti-chip plate 11 is installed on the top of the pull sleeve 6 to prevent iron filings from entering the working area.

There is a certain gap between the inner circular table surface of the limit plate 10 and the outer circular table surface of the taper sleeve 8, which is used to limit the maximum radial and axial movement of the tapered sleeve 8 and prevent iron filings from entering.

After the gear shaft workpiece is centered through the joint action of the workpiece tip 4 fixed on the base 1 and the machine tool tailstock tip 12, the hydraulic cylinder of the machine tool is started to drive the clamping column 9 to move downward through the pull rod 2 and the pull sleeve 6, and the clamping column 9 passes through the The tapered surface of the taper sleeve 8 cooperates to realize radial movement, thereby clamping the workpiece to form a rigid body. The power of the machine tool is transmitted to the taper sleeve 8 and the clamping column 9 through the base 1 and the positioning seat 5 through friction, which can ensure the synchronous rotation of the workpiece and the machine tool spindle for gear hobbing. Because there is a gap between the limit plate 10 and the taper sleeve 8, the taper sleeve 8 and the three clamping columns 9 float with the outer circle of the centered gear shaft workpiece before clamping the workpiece, so as to avoid interference.

The utility model is not limited to the above-mentioned embodiments, and various changes can be made without departing from the gist of the utility model within the scope of knowledge of those skilled in the art.

Claims (3)

1. A CNC hobbing fixture for a gear shaft, including a base (1), a workpiece tip (4), a spacer (3), a positioning seat (5), a pull sleeve (6), a taper sleeve (8) and a clamping Column (9), characterized in that: A) The workpiece tip (4) is installed on the boss in the center of the base (1); B) The positioning seat (5) is positioned with the base (1) through the spigot and fixedly connected with the base (1) through screws, and the inverted taper sleeve (8) is placed on the top platform and the fixed connection with the screw limit plate (10); C) The outer cylindrical surface of the pull sleeve (6) cooperates with the inner hole of the positioning seat (5), rigidly connects with the pull rod (2) through the spacer (3) and the screw through the base (1), and opens on the upper end of the pull sleeve (6). There are three evenly distributed circular holes, and a clamping column (9) with a tapered surface and a cylindrical surface is installed in each circular hole, and a cylindrical pin (7) is installed in the longitudinal hole of the clamping column (9). ), the tapered surface of the clamping column (9) is in contact with the inner tapered surface of the taper sleeve (8), and the cylindrical surface at the other end is in contact with the outer cylindrical surface of the clamped workpiece. 2. The numerically controlled gear hobbing fixture for gear shafts according to claim 1, characterized in that: an anti-chip plate (11) is installed on the top of the pull sleeve (6). 3. The numerically controlled gear hobbing fixture for a gear shaft according to claim 1, characterized in that there is a gap between the inner circular table surface of the limit plate (10) and the outer circular table surface of the taper sleeve (8).