CN215788215U

CN215788215U - Large-cylinder table top turning clamp for short and small workpieces

Info

Publication number: CN215788215U
Application number: CN202122064598.9U
Authority: CN
Inventors: 徐海昆; 杨德云; 兰超; 杨安帅; 杨瑾; 张光和; 柳杰
Original assignee: Kunming Honggu Machinery Manufacturing Co ltd
Current assignee: Kunming Honggu Machinery Manufacturing Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-02-11
Anticipated expiration: 2031-08-30

Abstract

The utility model discloses a large cylindrical table top turning clamp for short and small workpieces, which comprises a fixed shaft, an eccentric seat, an eccentric cavity and a set screw, wherein the eccentric seat is connected with one end of the fixed shaft, the eccentric cavity is laterally arranged on the eccentric seat, the opening direction of the eccentric cavity is far away from the axis of the fixed shaft, the vertical distance from the bottom of the eccentric cavity to the axis of the fixed shaft is matched with the rotation radius of the large cylindrical table top, a threaded hole parallel to the axis is formed in the rear wall of one end, far away from the fixed shaft, of the eccentric cavity, and the set screw penetrates through the threaded hole. The eccentric seat is provided with the eccentric cavity for positioning, so that the turning radius of the surface to be processed of the workpiece is extended, the workpiece is fixed by the set screw to prevent the workpiece from moving to influence the precision during processing, meanwhile, the eccentric seat can balance the eccentric inertia formed by the eccentricity of the workpiece, so that the processing precision is further improved, and the fixed shaft can be suitable for clamping and processing of a three-jaw chuck, a pipe-retracting type clamp and other chucks and has the characteristics of simple structure, convenience in clamping, good rigidity, high precision and good adaptability.

Description

Large-cylinder table top turning clamp for short and small workpieces

Technical Field

The utility model belongs to the technical field of mechanical clamps, and particularly relates to a large cylindrical table top turning clamp for short and small workpieces, which is simple in structure, convenient to clamp, good in rigidity, high in precision and good in adaptability.

Background

The turning machining has the advantages of simple equipment, simple and convenient operation, high machining efficiency and the like, and can be widely applied to the machining of the inner circle and the outer circle of the rotary workpiece. However, in machining, the turning radius of the cylindrical table surface on some workpieces is often larger than that of the workpiece itself, and in the machining of such parts on a horizontal lathe, an auxiliary rod is required to lengthen the workpiece, but after lengthening, the lathe is vibrated due to a large eccentric amount during rotation, which not only affects the machining precision of the workpiece, but also easily causes damage to the lathe spindle. In addition, turning is performed by adopting an eccentric shaft sleeve mode under the condition that the rotation radius is larger than the workpiece, but the eccentric shaft sleeve is overlarge in size and complex in structure and high in tooling cost for the workpiece with the shape not being a rotation body, so that the application limitation is large. Of course, for a workpiece with a not too large eccentricity, in the prior art, there is also a method of reserving an eccentric clamping portion in advance on a non-rotating body workpiece, then clamping the eccentric clamping portion by a chuck to process a large cylindrical table top, and cutting off the eccentric clamping portion after completion. In addition, a workpiece is eccentrically arranged on a turntable of a vertical lathe for processing, although the workpiece is eccentric, the turntable of the vertical lathe has stronger rigidity than a main shaft of a horizontal lathe, so that the adverse effect caused by the eccentricity can be reduced or even ignored, and the processing of the workpiece can be satisfied; however, because the workpiece is small, the processing cost of the vertical lathe is high, and the method cannot be adopted for a unit without the vertical lathe.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a large cylindrical table top turning clamp for short workpieces, which has the advantages of simple structure, convenience in clamping, good rigidity, high precision and good adaptability.

The purpose of the utility model is realized as follows: including fixed axle, eccentric seat, eccentric chamber, holding screw, eccentric seat become rectangle or cylindrical structure and with the one end fixed connection of fixed axle, eccentric chamber side direction sets up on eccentric seat and the axis that the fixed axle was kept away from to the opening direction, the bottom in eccentric chamber to the perpendicular distance and the big cylinder mesa radius of gyration phase-match of fixed axle axis, be provided with the screw hole parallel with the axis on the back wall of fixed axle one end is kept away from to the eccentric chamber, holding screw threaded connection's the threaded hole of passing and the terminal surface is inside.

The utility model has the beneficial effects that:

1. the eccentric seat is provided with the eccentric cavity to position the workpiece, so that the rotating radius of a large cylindrical table surface of the workpiece is extended, the workpiece is fixed by the set screw to prevent the workpiece from moving to influence the precision during machining, meanwhile, the eccentric seat can balance the eccentric inertia formed by the eccentricity of the workpiece, so that the machining precision is further improved, and the fixed shaft can be suitable for clamping and machining of a three-jaw chuck, a pipe-collecting type clamp and other chucks and has strong adaptability.

2. The utility model forms a front clamping and rear jacking mode for the workpiece by the set screw on the rear wall of the eccentric cavity, has stable and reliable clamping and convenient replacement, and can increase the rigidity of the workpiece during cutting, thereby effectively offsetting the cutting force acting on the workpiece, inhibiting the vibration of the workpiece during high-speed turning and effectively improving the machining precision.

3. The utility model can further arrange a thread adjusting mechanism on the side wall and/or the bottom of the eccentric cavity, and can finely adjust the left and right eccentric amount and the radial eccentric amount of the clamped workpiece, thereby not only improving the precision of the machined workpiece, but also being suitable for the public use of different workpieces within a certain size range, and further improving the adaptability of the workpiece.

In conclusion, the clamp has the characteristics of simple structure, convenience in clamping, good rigidity, high precision and good adaptability.

Drawings

FIG. 1 is a schematic view of a short workpiece with a large cylindrical table according to the present invention;

FIG. 2 is a schematic view of the present invention;

FIG. 3 is a schematic view of the operation of FIG. 2;

FIG. 4 is a second schematic structural diagram of the present invention;

in the figure: 1-fixed shaft, 2-eccentric seat, 3-eccentric cavity, 3A-rear wall, 3B-side wall, 3C-boss, 3D-front wall, 3E-groove, 4-set screw, 5-threaded hole, 6-thrust plate, 7-adjusting screw, 8-adjusting plate, 9-workpiece and 9A-large cylindrical table top.

Detailed Description

The utility model is further illustrated by the following figures and examples, which are not intended to limit the utility model in any way, and any variations or modifications which are based on the teachings of the utility model are intended to be within the scope of the utility model.

As shown in fig. 1, 2 and 3, the eccentric seat comprises a fixed shaft 1, an eccentric seat 2, an eccentric cavity 3 and a set screw 4, wherein the eccentric seat 2 is in a rectangular or cylindrical structure and is fixedly connected with one end of the fixed shaft 1, the eccentric cavity 3 is laterally arranged on the eccentric seat 2, the opening direction of the eccentric cavity 3 is far away from the axis of the fixed shaft 1, the vertical distance from the bottom of the eccentric cavity 3 to the axis of the fixed shaft 1 is matched with the rotation radius of a large cylindrical table surface, a threaded hole 5 parallel to the axis is arranged on a rear wall 3A of the eccentric cavity 3 at one end far away from the fixed shaft 1, and the set screw 4 penetrates through the threaded hole 5 in a threaded manner and faces inwards.

The rear wall 3A of the eccentric cavity 3 is at least provided with two threaded holes 5 parallel to the axis at intervals, and the threaded holes 5 of the rear wall 3A are internally threaded with set screws 4.

A thrust plate 6 is arranged on one side, close to the rear wall 3A, in the eccentric cavity 3, and the end face of the set screw 4 abuts against the surface of the thrust plate 6.

The thrust plate 6 is a flat plate or a right-angle trapezoidal plate with a large upper part and a small lower part, and the end surface of the set screw 4 abuts against the inclined surface of the right-angle trapezoidal plate.

As shown in fig. 2 and 4, the eccentric cavity 3 has no side wall at one side in the axial direction of the fixed shaft 1 and is open, the other side is provided with a side wall 3B, the side wall 3B is provided with a threaded hole 5 or a boss 3C is arranged in the side wall 3B facing the eccentric cavity 3, and the threaded hole 5 of the side wall 3B is connected with an adjusting screw 7 in a threaded manner.

As shown in fig. 2, the side wall 3B of the eccentric chamber 3 is fixedly connected to the front wall 3D and the rear wall 3A of the eccentric chamber 3 by fixing screws 7 at both sides.

As shown in fig. 4, a thrust plate 6 is disposed on a side of the eccentric cavity 3 close to the side wall 3B, and an end surface of the adjusting screw 7 abuts against a surface of the thrust plate 6.

The upper end of the front wall 3D is provided with an indicating line coincident with the axis of the fixed shaft 1.

A groove 3E parallel to the rear wall 3A is formed in the bottom of the eccentric cavity 3 at least on one side close to the rear wall 3A, the length of the bottom of the eccentric cavity 3 after the groove 3E is removed is smaller than that of a pre-machined workpiece, and the thrust plate 6 is arranged in the groove 3E.

The bottom in eccentric chamber 3 is provided with regulating plate 8, the perpendicular interval in bottom in eccentric chamber 3 is provided with screw hole 5, screw hole 5 threaded connection in eccentric chamber 3 bottom has adjusting screw 7 that supports tight regulating plate 8 bottom.

The one end of eccentric seat 2 keeping away from eccentric chamber 3 is provided with

screw hole

5, 5 female connections in screw hole of eccentric seat 2 have the balancing weight.

The working process of the utility model is as follows:

as shown in fig. 1, 2 and 3, during machining, the fixed shaft 1 is clamped on a chuck of a lathe, then the workpiece 9 is placed in the eccentric cavity 3 and the side surface is tightly attached to the thrust plate 6 on one side of the side wall 3B, the set screw 4 is tightened, the thrust plate 6 on one side of the rear wall 3A is slightly pressed against the end surface of the workpiece 9, then the adjusting screw 7 is adjusted to push the thrust plate 6 on one side of the side wall 3B to move, a preset central line on the large cylindrical table top 9A to be machined is aligned with an indication line on the front wall 3D, finally the set screw 4 is tightened to clamp the workpiece 9, and the lathe is started to machine the large cylindrical table top 9A. After the machining is finished, the clamp can be disassembled according to the clamping process, and vice versa.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a big cylinder mesa turning anchor clamps for short and small work piece, its characterized in that includes fixed axle (1), eccentric seat (2), eccentric chamber (3), holding screw (4), eccentric seat (2) become rectangle or cylindrical structure and with the one end fixed connection of fixed axle (1), eccentric chamber (3) side direction sets up on eccentric seat (2) and the axis that fixed axle (1) was kept away from to the opening direction, the bottom of eccentric chamber (3) is provided with screw hole (5) parallel with the axis on back wall (3A) of fixed axle (1) one end is kept away from to eccentric chamber (3) to the vertical distance and big cylinder mesa radius of gyration phase-match of fixed axle (1), holding screw (4) threaded connection pass in screw hole (5) and the terminal surface inwards.

2. The large-column table turning clamp for short workpieces according to claim 1, wherein the rear wall (3A) of the eccentric cavity (3) is provided with at least two threaded holes (5) parallel to the axis at intervals, and the threaded holes (5) of the rear wall (3A) are internally threaded with the set screws (4).

3. The large cylindrical table turning clamp for short workpieces according to claim 2, wherein a thrust plate (6) is arranged on the side of the eccentric cavity (3) close to the rear wall (3A), and the end face of the set screw (4) abuts against the surface of the thrust plate (6).

4. The large cylindrical table turning clamp for short workpieces as claimed in claim 3, wherein the thrust plate (6) is a flat plate or a right-angle trapezoidal plate with a large top and a small bottom, and the end surface of the set screw (4) abuts against the inclined surface of the right-angle trapezoidal plate.

5. The large-cylinder table turning clamp for the short and small workpieces according to claim 3 or 4, characterized in that the eccentric cavity (3) is free of side wall at one side in the axial direction of the fixed shaft (1) and is in an open shape, the other side of the eccentric cavity is provided with a side wall (3B), the side wall (3B) is provided with a threaded hole (5) or the side wall (3B) is provided with a boss (3C) facing the eccentric cavity (3), and the threaded hole (5) of the side wall (3B) is internally threaded with an adjusting screw (7).

6. The large cylindrical table turning fixture for short and small workpieces according to claim 5, characterized in that the side wall (3B) provided with the boss (3C) is fixedly connected with the front wall (3D) and the rear wall (3A) of the eccentric cavity (3) respectively through adjusting screws (7) at both sides.

7. The large cylindrical table turning clamp for short workpieces according to claim 5, wherein a thrust plate (6) is arranged on one side of the inner near wall (3B) of the eccentric cavity (3), and the end face of the adjusting screw (7) abuts against the surface of the thrust plate (6).

8. The large cylindrical table turning fixture for short workpieces as claimed in claim 5, wherein the bottom of the eccentric cavity (3) is provided with a groove (3E) parallel to the rear wall (3A) at least near the rear wall (3A), the length of the bottom of the eccentric cavity (3) after the groove (3E) is removed is less than the length of the pre-machined workpiece, and the thrust plate (6) is arranged in the groove (3E).

9. The large cylindrical table turning clamp for the short and small workpieces according to claim 5, characterized in that an adjusting plate (8) is arranged at the bottom of the eccentric cavity (3), threaded holes (5) are vertically arranged at intervals at the bottom of the eccentric cavity (3), and the threaded holes (5) at the bottom of the eccentric cavity (3) are in threaded connection with adjusting screws (7) which tightly abut against the bottom of the adjusting plate (8).

10. The large cylindrical table turning clamp for short workpieces according to claim 5, characterized in that the eccentric seat (2) is provided with a threaded hole (5) at one end far away from the eccentric cavity (3), and a balancing weight is connected with the threaded hole (5) of the eccentric seat (2) in a threaded way.