Fixture for machining workpiece with eccentric inner circle and eccentric outer circle

Abstract

The utility model discloses a clamp for machining an inner circle and outer circle eccentric workpiece. The central axis of a positioning mother plate coincides with the rotating central axis of machining equipment. The zero-point positioning units A and B are fixed on the upper end face of the positioning mother board, and the distance difference between the central axes of the zero-point positioning units A and B and the central axis of the positioning mother board is the distance between the central axes of inner and outer circles of a machined workpiece; a centering blind rivet and a constant angular blind rivet which are matched with the zero point positioning units A and B for use are respectively fixed on the lower end face of the positioning sub-plate, a supporting disc is fixed on the positioning sub-plate, and the central axis of a mounting groove of the supporting disc coincides with the central axis of the outer circle of a machined workpiece; when the outer circle of the workpiece is machined, the centering blind rivet and the constant-angle blind rivet are installed in the zero-point positioning unit A and the zero-point positioning unit B respectively, and when the inner circle of the workpiece is machined, the centering blind rivet and the constant-angle blind rivet are installed in the zero-point positioning unit B and the zero-point positioning unit A. The secondary clamping device has high repeated positioning precision, and high positioning precision and high efficiency of secondary clamping of inner and outer circle eccentric workpieces are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of part processing and relates to a fixture for processing an inner and outer circle eccentric workpiece by a vertical grinding machine. Background Technique

[0002] In the processing of some outer circles and inner holes with high shape precision, grinding is usually adopted. Grinding is a processing method that only ensures the shape precision and the coaxiality of a simple outer circle and inner hole. If the outer circle and the inner hole are not coaxial but have an eccentricity, and the eccentricity precision requirement is high, the outer circle and the inner hole are ground twice. The shape precision of the outer circle and the inner hole is ensured by the grinding machine, but it is not easy to ensure the eccentricity precision of the two. In the existing technology, an eccentric step positioning disk is made in advance. The eccentricity of the two-step outer circles of the positioning disk is the same as that of the outer circle and the inner hole of the workpiece. The workpiece is installed on the positioning disk. When grinding the outer circle, the outer circle of the step of the positioning disk concentric with the outer circle is aligned by dial indicator. When grinding the inner hole, the outer circle of the step of the positioning disk concentric with the inner hole is aligned by dial indicator. This method is time-consuming and laborious, with low efficiency. The eccentricity precision completely depends on the dial indicator precision and is unstable. Content of the Utility Model

[0003] The purpose of the utility model is to solve the above problems existing in the prior art, and provide a fixture for processing an inner and outer circle eccentric workpiece. The fixture has high repeat positioning precision and realizes high positioning precision and high efficiency for the secondary clamping of the inner and outer circle eccentric workpiece.

[0004] To achieve the above object, the technical solution of the present utility model is: A fixture for machining eccentric workpieces with inner and outer circles, including component A and component B; Component A includes a positioning mother board, zero-point positioning unit A and zero-point positioning unit B; The positioning mother board is connected to the workbench of the machining equipment, and its central axis coincides with the rotation central axis of the machining equipment; Zero-point positioning unit A and zero-point positioning unit B are respectively fixed at both ends of the upper end surface of the positioning mother board, and the central axes of the two are in the same plane as the central axis of the positioning mother board. The distance difference between the distances from the central axis of zero-point positioning unit A and the central axis of zero-point positioning unit B to the central axis of the positioning mother board is the distance between the central axes of the inner and outer circles of the workpiece to be machined; A gas passage is arranged inside the positioning mother board. One end of the gas passage is provided with a communication port connected to the external gas circuit, and the other end is provided with air ports communicating with the two zero-point positioning units; Component B includes a positioning sub-board, a support disk, centering pull studs and angular positioning pull studs respectively used in cooperation with zero-point positioning unit A and zero-point positioning unit B; The centering pull studs and angular positioning pull studs are respectively fixedly installed on the lower end surface of the positioning sub-board. The support disk is arranged on the upper end surface of the positioning sub-board. The upper end surface of the support disk is provided with a workpiece installation groove. The positioning sub-board, the support disk and the bottom surface of the workpiece are detachably fixed together. The central axis of the installation groove of the support disk coincides with the central axis of the outer circle of the workpiece to be machined; When machining the workpiece, place the workpiece to be machined in the workpiece installation groove of the support disk. When machining the outer circle of the workpiece, install the centering pull studs and angular positioning pull studs in zero-point positioning unit A and zero-point positioning unit B respectively. At this time, the central axis of the outer circle of the workpiece coincides with the rotation central axis of the grinding machine. When machining the inner circle of the workpiece, rotate the workpiece horizontally by 180°, and install the centering pull studs and angular positioning pull studs in zero-point positioning unit B and zero-point positioning unit A respectively. At this time, the central axis of the inner circle of the workpiece coincides with the rotation central axis of the grinding machine.

[0005] Further preferably, more than three lifting lugs are arranged on the outer circle of the positioning sub-board. It is convenient for the hoisting of component B to achieve the hoisting conversion position of component B and the installation and disassembly of the workpiece.

[0006] Further preferably, more than three mutually penetrating threaded holes are arranged on the bottom edge of the positioning sub-board, the bottom edge of the support disk and the bottom edge of the workpiece. The positioning sub-board, the support disk and the bottom surface of the workpiece are fixed together by locking screws.

[0007] Further preferably, the distance between the central axis of zero-point positioning unit A and the central axis of zero-point positioning unit B is 160 mm; The distance between the central axis of zero-point positioning unit A and the central axis of the positioning mother board is 87.5 ± 0.005 mm, and the distance between the central axis of zero-point positioning unit B and the central axis of the positioning mother board is 72.5 ± 0.005 mm; The distance between the central axes of the inner and outer circles of the workpiece to be machined is 15 ± 0.01 mm.

[0008] Working process: When machining a workpiece, for example, when grinding the inner and outer circles of a workpiece with a vertical grinding machine, the positioning master plate can be connected to the workbench of the grinding machine, and its central axis coincides with the rotational center axis of the grinding machine; place the workpiece to be machined in the workpiece mounting groove of the support plate. First, machine the outer circle of the workpiece. Install the centering pull stud and the angular positioning pull stud in the zero-point positioning unit A and the zero-point positioning unit B respectively. Then, the outer circle grinding head of the grinding machine grinds the outer circle of the workpiece. After the machining is completed, lift the assembly B and the workpiece out of the zero-point positioning unit and rotate them by 180°. Then, lift the assembly B and the workpiece into the zero-point positioning unit. At this time, the centering pull stud and the angular positioning pull stud are installed in the zero-point positioning unit B and the zero-point positioning unit A respectively. Then, the inner circle grinding head of the grinding machine grinds the inner circle of the workpiece.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows: Through zero-point positioning and its eccentric arrangement, the present utility model realizes high positioning accuracy for the secondary clamping of inner and outer circle eccentric workpieces, ensures the position accuracy between the outer circle and the inner hole of the ground workpiece, has a simple structure, is easy to manufacture, and has a low cost; moreover, the operation is simple and the processing efficiency is high. Description of the Drawings

[0010] Figure 1 The front view when machining the inner circle of the workpiece of the present utility model;

[0011] Figure 2 The top view when machining the inner circle of the workpiece of the present utility model;

[0012] Figure 3 is Figure 2 the AA sectional view of

[0013] Figure 4 The structural schematic diagram when machining the outer circle of the workpiece of the present utility model. Specific Embodiments

[0014] The following further describes the present utility model in conjunction with the drawings and specific embodiments.

[0015] Such as Figures 1 to 4As shown in the figure, this embodiment includes component A and component B. Component A includes a positioning mother board 1, a zero-point positioning unit A 21, and a zero-point positioning unit B 22. The positioning mother board 1 is installed on the workbench 15 of the processing equipment, and its central axis coincides with the rotation central axis of the processing equipment. The zero-point positioning unit A 21 and the zero-point positioning unit B 22 are respectively fixed at both ends of the upper end surface of the positioning mother board 1, and the central axes of the two are in the same plane as the central axis of the positioning mother board 1. The distance difference between the central axis of the zero-point positioning unit A 21 and the central axis of the zero-point positioning unit B 22 and the distance between the central axis of the positioning mother board 1 is the distance between the inner and outer circle central axes of the processed workpiece. In this embodiment, the distance between the central axis of the zero-point positioning unit A 21 and the central axis of the zero-point positioning unit B 22 is 160 mm, and the distances between the central axes of the zero-point positioning unit A 21 and the zero-point positioning unit B 22 and the central axis of the positioning mother board 1 are 72.5 ± 0.005 mm and 87.5 ± 0.005 mm respectively, which is suitable for processing workpieces with a distance of 15 ± 0.01 mm between the inner and outer circle central axes. A gas channel is provided in the positioning mother board 1. One end of the gas channel is provided with a communication port connected to the external gas path, and the other end is provided with an air port connected to the two zero-point positioning units 2. A pneumatic quick connector 8 is fixed on the communication port of the positioning mother board 1 connected to the external gas path, and it is connected to the external gas path through the pneumatic quick connector 8. Component B includes a positioning sub-board 4, a support disk 5, a centering pull stud 3 and an angular positioning pull stud 7 that are respectively used in cooperation with the zero-point positioning unit A 21 and the zero-point positioning unit B 22. The centering pull stud 3 and the angular positioning pull stud 7 are respectively fixedly installed on the lower end surface of the positioning sub-board 4. In this embodiment, the distance between the two is set to 160 mm, and it is eccentric 7.5 mm to the left relative to the central axis of the positioning sub-board 4. The support disk 5 is arranged on the upper end surface of the positioning sub-board 4. A workpiece installation groove is provided on the upper end surface of the support disk 5. The positioning sub-board 4, the support disk 5 and the bottom surface of the workpiece are detachably fixed together, and the central axis of the installation groove of the support disk 5 coincides with the outer circle central axis of the processed workpiece 9. Preferably, there are three or more (four, five, etc. can also be set according to needs) mutually penetrating threaded holes on the bottom edge of the positioning sub-board 4, the bottom edge of the support disk 5 and the bottom edge of the workpiece 9. The positioning sub-board 4, the support disk 5 and the bottom surface of the workpiece 9 are fixed together by locking screws 6. Preferably, the positioning sub-board 4 is octagonal, and four (or three, six, etc.) lifting lugs 10 are symmetrically fixed on its outer edge. It is convenient to hoist component B to achieve the hoisting conversion position of component B and the installation and disassembly of the workpiece.When machining the workpiece 9, place the workpiece 9 in the workpiece mounting groove of the support disk 5. When machining the outer circle of the workpiece 9, install the centering pull stud 3 and the angular positioning pull stud 7 in the zero-point positioning unit B22 and the zero-point positioning unit A21 respectively. At this time, the central axis 14 of the outer circle of the workpiece coincides with the rotation central axis 12 of the grinding machine. When machining the inner circle of the workpiece 9, install the centering pull stud 3 and the angular positioning pull stud 7 in the zero-point positioning unit A21 and the zero-point positioning unit B22 respectively. At this time, the central axis 13 of the inner circle of the workpiece coincides with the rotation central axis 12 of the grinding machine.

[0016] Working process: When grinding the inner and outer circles of the workpiece 9 with a vertical grinding machine, the positioning mother board 1 can be connected to the workbench of the grinding machine, and its central axis coincides with the rotation central axis 12 of the grinding machine; place the workpiece 9 in the workpiece mounting groove of the support disk 5. First, machine the outer circle of the workpiece 9, and install the centering pull stud 3 and the angular positioning pull stud 7 in the zero-point positioning units A21 and B22 respectively. In this embodiment, the internal spring drives the tongue to lock, and it is released by air pressure. When the zero-point positioning units A21 and B22 are clamped, no external power source is required, and the rotational machining of the utility model on the lathe can be realized; at this time, the central axis 14 of the outer circle of the workpiece 9 coincides with the rotation central axis 12 of the grinding machine. After grinding the outer circle of the workpiece, pressurize the air circuits of the zero-point positioning units A21 and B22 to release the centering pull stud 3 and the angular positioning pull stud 7. When machining the inner circle of the workpiece 9, lift out the assembly B and the workpiece 9 together and turn them horizontally by 180°. Install the angular positioning pull stud 7 and the centering pull stud 3 in the zero-point positioning unit A21 and the zero-point positioning unit B22 respectively. At this time, the central axis 13 of the inner circle of the workpiece 9 coincides with the rotation central axis 12 of the grinding machine. 11 is the inner-circle grinding wheel, and 16 is the outer-circle grinding wheel.

[0017] Of course, there are also many other embodiments of the present utility model. Without departing from the spirit and essence of the present utility model, those skilled in the art can make corresponding changes and deformations according to the present utility model. However, these corresponding changes and deformations should all belong to the improvement of equivalent technologies and fall within the protection scope of the claims of the present utility model.

Claims

1. A fixture for machining inner and outer circle eccentric workpieces, characterized in that: It includes component A and component B; Component A includes a positioning mother board, zero-point positioning unit A and zero-point positioning unit B; The positioning mother board is connected to the workbench of the processing equipment, and its central axis coincides with the rotation central axis of the processing equipment; Zero-point positioning unit A and zero-point positioning unit B are respectively fixed at both ends of the upper end face of the positioning mother board, and the central axes of the two are in the same plane as the central axis of the positioning mother board. The distance difference between the distances between the central axes of zero-point positioning unit A and zero-point positioning unit B and the central axis of the positioning mother board is the distance between the inner and outer circle central axes of the processed workpiece; A gas passage is provided in the positioning mother board. One end of the gas passage is provided with a communication port connected to the external air circuit, and the other end is provided with air ports communicating with the two zero-point positioning units; Component B includes a positioning sub-board, a support disk, centering pull studs and angle-setting pull studs that are respectively used in cooperation with zero-point positioning unit A and zero-point positioning unit B; The centering pull studs and angle-setting pull studs are respectively fixedly installed on the lower end face of the positioning sub-board. The support disk is arranged on the upper end face of the positioning sub-board. A workpiece installation groove is provided on the upper end face of the support disk. The positioning sub-board, the support disk and the bottom surface of the workpiece are detachably fixed together. The central axis of the installation groove of the support disk coincides with the outer circle central axis of the processed workpiece; When processing the workpiece, place the processed workpiece in the workpiece installation groove of the support disk. When processing the outer circle of the workpiece, install the centering pull studs and angle-setting pull studs in zero-point positioning unit A and zero-point positioning unit B respectively. At this time, the outer circle central axis of the processed workpiece coincides with the rotation central axis of the grinding machine. When processing the inner circle of the workpiece, install the centering pull studs and angle-setting pull studs in zero-point positioning unit B and zero-point positioning unit A respectively. At this time, the inner circle central axis of the processed workpiece coincides with the rotation central axis of the grinding machine.

2. The fixture for machining inner and outer circle eccentric workpieces according to claim 1, wherein: The distance between the central axes of zero-point positioning unit A and zero-point positioning unit B is 160 mm; The distance between zero-point positioning unit A and the central axis of the positioning mother board is 87.5 ± 0.005 mm, and the distance between zero-point positioning unit B and the central axis of the positioning mother board is 72.5 ± 0.005 mm; The distance between the inner and circle central axes of the processed workpiece is 15 ± 0.01 mm.

3. The fixture for machining eccentric workpieces with inner and outer circles according to claim 1 or 2, characterized in that: There are more than three lifting lugs provided on the outer circle of the positioning sub-board.

4. The fixture for machining inner and outer circle eccentric workpieces according to claim 3, wherein: There are more than three mutually penetrating threaded holes provided on the bottom edge of the positioning sub-board, the bottom edge of the support disk and the bottom edge of the workpiece. The positioning sub-board, the support disk and the bottom surface of the workpiece are fixed together by locking screws.

5. The fixture for machining inner and outer circle eccentric workpieces according to claim 1 or 2, characterized in that: There are more than three mutually penetrating threaded holes provided on the bottom edge of the positioning sub-board, the bottom edge of the support disk and the bottom edge of the workpiece. The positioning sub-board, the support disk and the bottom surface of the workpiece are fixed together by locking screws.

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