CN114131374A

CN114131374A - Clamp for processing eccentric shaft hole

Info

Publication number: CN114131374A
Application number: CN202111500647.7A
Authority: CN
Inventors: 高飒飒; 翟宏哲; 张心怡; 王泽雨; 张文杰
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-03-04

Abstract

The invention discloses a clamp for processing an eccentric shaft hole, which comprises an eccentric shaft sleeve with an eccentric hole, wherein a circle of limiting boss is arranged on the inner wall of the eccentric hole, the thick end of the eccentric shaft sleeve is axially arranged to be an open structure, and the end surfaces on two sides of the open structure are parallel to each other; the end parts of the eccentric shaft sleeves, which are positioned at the two sides of the opening structure, are provided with two symmetrical mounting grooves, and the mounting surfaces of the mounting grooves are parallel to the end surface of the opening structure; the mounting surfaces of the two mounting grooves are respectively provided with two through holes which penetrate through the mounting surface and the end surface of the opening structure and correspond to each other, and the hexagon head reaming holes penetrate through the through holes on the mounting surface on one side of the opening structure and penetrate out of the through holes on the mounting surface on the other side of the opening structure by bolts and are fastened and connected through I-shaped hexagon nuts with thick teeth; and a tightening threaded hole penetrating through the mounting surface and the end surface of the open structure is formed in the mounting surface on one side of the open structure, and a slotted flat-end tightening screw matched with the tightening threaded hole is arranged in the tightening threaded hole.

Description

Clamp for processing eccentric shaft hole

Technical Field

The invention relates to the technology of processing eccentric shaft holes, in particular to a clamp for processing eccentric shaft holes.

Background

The requirements on the position precision and the shape tolerance of the eccentric holes are continuously improved along with the eccentric sleeve parts and the eccentric shaft hole parts. The prior clamp has the following problems: 1. the clamp design is complicated, and the assembly body part is too much, and the cooperation is complicated. Is not suitable for clamping on a lathe, and the time for disassembling and replacing the parts is too long. And during use, the parts on the clamp may fly out of the lathe as the rotation speed of the lathe increases. This not only causes damage to the machine but also threatens the personal safety of the workers. 2. In the existing eccentric shaft hole lathe fixture, the positioning precision of the eccentric circular hole is not high, the form and position tolerance of the final hole cannot be guaranteed, the subsequent process is influenced, and the rejection rate of parts is increased finally to influence the actual production and use. 3. In the existing clamp design, a plurality of clamps cannot be directly clamped on a three-jaw chuck, and five degrees of freedom of parts during machining cannot be well limited. The cost of the clamp is high, the clamp cannot be replaced immediately after being damaged, and the interchangeability is poor. The production line can be stopped in the actual processing process, and unnecessary waste is caused.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a clamp for machining an eccentric shaft hole, which can be used for quickly disassembling and replacing a machined part.

In order to achieve the purpose, the invention adopts the following technical scheme:

a clamp for processing an eccentric shaft hole comprises an eccentric shaft sleeve with an eccentric hole, wherein a circle of limiting boss is arranged on the inner wall of the eccentric hole, the thick end of the eccentric shaft sleeve is axially arranged to be an open structure, and the end surfaces of two sides of the open structure are parallel to each other; the end parts of the eccentric shaft sleeves, which are positioned at the two sides of the opening structure, are provided with two symmetrical mounting grooves, and the mounting surfaces of the mounting grooves are parallel to the end surface of the opening structure; the mounting surfaces of the two mounting grooves are respectively provided with two through holes which penetrate through the mounting surface and the end surface of the opening structure and correspond to each other, and the hexagon head reaming holes penetrate through the through holes on the mounting surface on one side of the opening structure and penetrate out of the through holes on the mounting surface on the other side of the opening structure by bolts and are fastened and connected through the I-shaped hexagon nuts with thick teeth;

and a tightening threaded hole penetrating through the mounting surface and the end surface of the opening structure is formed in the mounting surface on one side of the opening structure, and a slotted flat-end tightening screw matched with the tightening threaded hole is arranged in the tightening threaded hole.

Furthermore, a gasket is arranged between the thick-tooth I-shaped hexagon nut and the mounting surface.

Furthermore, the two through holes in the mounting surface are arranged side by side along the axial direction of the eccentric shaft sleeve, and the fastening threaded hole is positioned between the two through holes in the same mounting surface.

Furthermore, each right-angle side of the eccentric shaft sleeve is of a chamfer structure.

Furthermore, the section of the mounting groove is of an arc-shaped triangular structure, and two straight lines of the triangular structure are perpendicular to each other.

Compared with the prior art, the invention has the following technical effects:

the fixture can ensure the form and position tolerance and the machining precision of the eccentric hole of the shaft part, has the characteristics of convenient disassembly and simple and stable part clamping, can be directly clamped on the three-jaw chuck, and can take out and load the machined part by only unscrewing the I-shaped hexagon nut with the coarse teeth and slightly rotating the flat end set screw of the slotting when the part is replaced. The invention has the characteristics of simple structure, few parts, low manufacturing cost, small investment, quick part replacement, safe use and the like.

Drawings

FIG. 1 is a perspective view of a fixture for machining an eccentric shaft hole according to an embodiment of the present invention;

FIG. 2 is a front view of a fixture for machining an eccentric shaft hole according to an embodiment of the present invention;

FIG. 3 is a left side view of a fixture for machining an eccentric shaft hole according to an embodiment of the present invention;

fig. 4 is a schematic view showing an assembly structure of a bolt for reaming a hexagonal head, a thick-thread i-type hexagon nut, and a washer according to the present invention.

In the figure: 1. an eccentric shaft sleeve; 2. an eccentric hole; 3. a limiting boss; 4. mounting grooves; 5. a mounting surface; 6. a bolt for reaming a hole with a hexagonal head; 7. a coarse I-shaped hexagon nut; 8. a slotted flat end set screw; 9. a gasket.

Detailed Description

The present invention will be explained in further detail with reference to examples.

Referring to fig. 1-4, the embodiment provides a fixture for processing an eccentric shaft hole, which includes an eccentric shaft sleeve 1 with an eccentric hole 2, wherein the inner wall of the eccentric hole 2 is provided with a circle of limiting bosses 3 for limiting five degrees of freedom in part processing and ensuring form and position tolerance and required precision of the eccentric hole 2; the thick end of the eccentric shaft sleeve 1 is axially arranged to be an open structure, and the end surfaces on the two sides of the open structure are parallel to each other; the end parts of the eccentric shaft sleeve 1, which are positioned at the two sides of the opening structure, are provided with two symmetrical mounting grooves 4, the section of each mounting groove 4 is of an arc-shaped triangular structure, two straight lines of the triangular structure are perpendicular to each other, and the mounting surface 5 of each mounting groove 4 is parallel to the end surface of the opening structure; two through holes which are mutually corresponding and penetrate through the mounting surface and the end surface of the opening structure are respectively formed in the mounting surfaces 5 of the two mounting grooves 4 along the axial direction of the eccentric shaft sleeve 1, and a bolt 6 for a hexagon head reaming hole penetrates through the through hole in the mounting surface 5 on one side of the opening structure and penetrates out of the through hole in the mounting surface 5 on the other side of the opening structure and is then fastened and connected through a thick-tooth I-shaped hexagon nut 7; preferably, a gasket 9 is arranged between the thick-tooth I-shaped hexagon nut 7 and the mounting surface 5 to ensure that excessive shear stress cannot be generated during assembly; the distance between the bolt 6 for the hexagon head reaming hole and the central axis of the eccentric hole 2 is larger than the radius of the eccentric hole 2; the tight screw hole that sets up that runs through installation face 5 and open structure terminal surface is equipped with on the installation face 5 of open structure one side, and tight screw hole is located the intermediate position of two through-holes on same installation face 5, and tight screw hole is equipped with the fluting flush end holding screw 8 rather than matching, and fluting flush end holding screw 8 is used for acting as the back screw, when anchor clamps used the back and need to change the part, is used for backing up by tight anchor clamps in order to change the processing part.

Preferably, in order to remove stress concentration, each right-angle side of the eccentric shaft sleeve 1 is set to be in a chamfer structure.

The working principle of the invention is as follows:

in the using process of the invention, the processed shaft is placed in the eccentric hole 2 of the eccentric shaft sleeve 1, and the bottom surface of the processed shaft is ensured to be contacted with the side surface of the limiting lug boss 3 in the eccentric hole 2, so as to ensure that the five degrees of freedom of the processed shaft are limited. After the machined shaft is assembled, the machined shaft is connected and locked by a thick-tooth I-shaped hexagon nut 7, a washer 9 and a hexagon-head reaming bolt 6 and is directly clamped in a lathe three-jaw chuck. After the processing is finished, the I-shaped hexagon nut 7 with the thick teeth is disassembled, the flat end set screw 8 of the open slot is screwed by a flat head screwdriver to jack the opening of the eccentric shaft sleeve 1 open by external force, and the processed part is taken out. When the novel eccentric shaft sleeve is used next time, only the slotted flat-end set screw 8 needs to be unloaded, a new machined piece is installed into the eccentric shaft sleeve 1, and the novel machined piece is screwed up by the thick-tooth I-shaped hexagon nut 3.

It should be noted that, whether the slotted flat-end set screw 8 is installed or not can be determined according to the rotating speed of the lathe rotating shaft during processing, if the rotating speed of the lathe is high, the slotted flat-end set screw 8 can be detached and used only when the shaft to be processed is replaced, and the slotted flat-end set screw serves as a jack-out screw; when the lathe speed is low, the slotted flat-end set screw 8 does not need to be disassembled.

Claims

1. The clamp for processing the eccentric shaft hole is characterized by comprising an eccentric shaft sleeve (1) with an eccentric hole (2), wherein a circle of limiting boss (3) is arranged on the inner wall of the eccentric hole (2), the thick end of the eccentric shaft sleeve (1) is axially arranged to be an open structure, and the end surfaces of two sides of the open structure are parallel to each other; the end parts of the eccentric shaft sleeve (1) positioned at the two sides of the opening structure are provided with two symmetrical mounting grooves (4), and the mounting surfaces (5) of the mounting grooves (4) are parallel to the end surface of the opening structure; two through holes which are mutually corresponding and penetrate through the mounting surface and the end surface of the opening structure are respectively formed in the mounting surface (5) of the two mounting grooves (4), and a bolt (6) for a hexagonal head reaming hole penetrates through the through hole in the mounting surface (5) on one side of the opening structure and penetrates out of the through hole in the mounting surface (5) on the other side of the opening structure and is then fastened and connected through a thick I-shaped hexagon nut (7);

and a tightening threaded hole penetrating through the mounting surface (5) and the end surface of the open structure is formed in the mounting surface (5) on one side of the open structure, and a slotted flat-end tightening screw (9) matched with the tightening threaded hole is arranged in the tightening threaded hole.

2. The jig for processing an eccentric shaft hole according to claim 1, wherein a washer (9) is provided between the thick-tooth i-type hexagon nut (7) and the mounting surface (5).

3. The jig for machining an eccentric shaft hole according to claim 1 or 2, wherein two through holes on the mounting surface (5) are arranged side by side in the axial direction of the eccentric sleeve (1), and the fastening threaded hole is located between the two through holes on the same mounting surface (5).

4. The jig for processing an eccentric shaft hole according to claim 1 or 2, wherein each right-angle side of the eccentric sleeve (1) is provided with a chamfer structure.

5. The jig for processing an eccentric shaft hole according to claim 1 or 2, wherein the section of the mounting groove (4) is a triangular structure with one side being arc-shaped, and two straight sides of the triangular structure are perpendicular to each other.