Small arc section part plane grinding combined positioning clamp

Abstract

The utility model discloses a small arc section part plane grinding combined positioning clamp which comprises a base, a sliding arm located on the base and an adjusting handle for adjusting the opening and closing distance of the sliding arm, the sliding arm is provided with an inner clamp body and an outer clamp body which are oppositely arranged, the inner clamp body is provided with a first arc-shaped positioning part and a first positioning step, and the outer clamp body is provided with a second arc-shaped positioning part. And a second arc-shaped positioning part, a second positioning step and an arc-shaped accommodating groove are arranged on the outer clamp body, so that the positioning of the small-arc-section part can be realized, and the grinding of the small-arc-section part is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a combined positioning fixture for surface grinding of small arc-segment parts. Background Art

[0002] In the machining process of parts for steam turbines, gas engines, compressors, etc., small arc-segment parts made of easily deformed materials usually need to be pieced together into a full circle by small arc segments and then processed on a vertical lathe; since the end face of the small arc-segment part needs to be used as the clamping and positioning surface during vertical lathe processing, the end face of the small arc-segment part on one side has the best possible flatness in its natural state before fine machining. The form and position tolerance requirements for this series of parts are very high, ranging from 0.02mm to 0.05mm, to avoid the problem of part dimensional accuracy and form and position tolerance exceeding the tolerance due to deformation caused by forced clamping and flattening on the vertical lathe workbench after the clamping tooling is removed due to poor flatness, which leads to the part returning to its natural state and rebounding deformation.

[0003] In addition, due to the steps on the end faces of the parts, they cannot be laid flat and the end face positioning cannot be used normally for surface grinding. In addition, the non-magnetic characteristics of the material also make it impossible to adsorb it normally on the grinder work surface for fixation. In addition, the material will be greatly deformed if it is clamped or pressed vigorously. Therefore, corresponding special clamping tooling must be made for parts of different diameters and arc segments, which has high production and storage costs. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a combined positioning fixture for surface grinding of small arc segment parts, which can realize the clamping and positioning of small arc segment parts and facilitate the grinding of small arc segment parts; in addition, the inner clamp and the outer clamp can be disassembled and replaced.

[0005] The utility model adopts the following technical solutions:

[0006] A combined positioning fixture for surface grinding of small arc-segment parts comprises a base, a sliding arm located on the base and an adjusting handle for adjusting the opening and closing distance of the sliding arm, the sliding arm is provided with an inner clamping body and an outer clamping body which are relatively arranged, the inner clamping body is provided with a first arc-shaped positioning portion and a first positioning step, the outer clamping body is provided with a second arc-shaped positioning portion, a second positioning step and an arc-shaped accommodating groove.

[0007] Preferably, the base includes a fixed base, a rotating base rotatably matched with the fixed base, and a locking mechanism located on the rotating base.

[0008] Preferably, the sliding arm includes a fixing portion provided on the base and a sliding portion capable of sliding relative to the fixing portion.

[0009] Preferably, the inner clamp body and the outer clamp body are connected to the sliding arm via a fastening connector.

[0010] Preferably, the first arc-shaped positioning portion and the second arc-shaped positioning portion are each provided with two recesses, forming three contact portions respectively.

[0011] Compared with the prior art, the utility model has the following advantages: for small arc segment parts made of non-magnetic materials that are easily deformed and whose clamping and positioning end faces cannot be laid flat, the patent provides a combined positioning fixture, which solves the surface grinding of non-magnetic, extremely easy to deform parts and whose clamping and positioning end faces cannot be laid flat. The fixture has a simple structure and is easy to use. It clamps with a smaller clamping force to minimize or eliminate part deformation caused by the clamping force, so that the end face of the part after grinding has better flatness in a natural state. The positioning fixture can replace the inner and outer clamps to achieve clamping and positioning of small arc segment parts of different sizes and specifications, and has good versatility and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the overall structure diagram;

[0013] Figure 2 It is a detailed structural diagram of the inside and outside;

[0014] Figure 3 It is the structural diagram of the small arc segment part;

[0015] Figure 4 It is a schematic diagram of the positioning of the part fixture;

[0016] Figure 5 This is a schematic diagram of positioning the part fixture from another perspective;

[0017] Figure 6 A cross-sectional view of the fixture.

[0018] In the figure, 1. fixed base; 2. locking mechanism; 3. rotating base; 4. sliding arm; 41. fixed part; 42. sliding part; 5. adjustment handle; 6. fastening connector; 7. outer clamping body; 71. first arc-shaped positioning part; 72. first positioning step; 8. small arc segment part; 9. inner clamping body; 91. second arc-shaped positioning part; 92. second positioning step; 93. arc-shaped receiving groove. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the technical solution of the utility model, a detailed description is given below in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] Since the end faces of small arc segment parts made of non-magnetic materials have stepped surfaces that cannot be laid flat, the end face positioning cannot be used for surface grinding. The non-magnetic characteristics of the material also make it impossible to adsorb on the grinder work surface for fixation. In addition, the material will be greatly deformed when clamped or pressed vigorously, and there are many specifications of parts with different diameters and arc segments. If a special clamping tool corresponding to each other is made, the production and storage costs are quite high.

[0022] Therefore, if Figure 1-6 As shown, this embodiment provides a combined positioning fixture for surface grinding of small arc segment parts, including a base, a sliding arm 4 located on the base, and an adjusting handle 5 for adjusting the opening and closing distance of the sliding arm 4. The sliding arm 4 is provided with an inner clamp body 7 and an outer clamp body 9 arranged relatively to each other for positioning the parts to be processed. The inner clamp body 7 is provided with a first arc-shaped positioning portion 71 and a first positioning step 72, and the outer clamp body 9 is provided with a second arc-shaped positioning portion 91, a second positioning step 92 and an arc-shaped accommodating groove 93. The first arc-shaped positioning portion 71 and the second arc-shaped positioning portion 91 are both arc-shaped surfaces, which are convenient for pressing on the arc-shaped surface of the small arc segment part for positioning. When in use, the lower surface of the small arc segment part The surface is located on the first positioning step 72 and the second positioning step 92, and the lower end protrusion of the small arc segment part is located in the arc accommodating groove 93. There is a certain gap between the lower end protrusion of the small arc segment part and the bottom of the arc accommodating groove 93 to prevent over-positioning. The first arc shaped positioning portion 71 and the second arc shaped positioning portion 91 are respectively against the two arc surfaces of the part to position the part, and then the upper surface of the part is processed by a processing tool (such as a grinder, a milling machine, etc.), which solves the surface grinding when the part is non-magnetic, easy to deform, and the end face of the part cannot be flattened during clamping and positioning. The fixture has a simple structure and is easy to use. It is clamped with a small clamping force to minimize or eliminate the deformation of the part caused by the clamping force.

[0023] In addition, if Figure 2 As shown, the first arc-shaped positioning portion 71 and the second arc-shaped positioning portion 91 are each provided with two depressions, forming three contact portions respectively, so that the first arc-shaped positioning portion 71 and the second arc-shaped positioning portion 91 are positioned with the workpiece to be processed by three-point clamping and the clamping points can be spot welded with pure copper to reduce clamping deformation.

[0024] like Figure 6 As shown, the inner clamp body 7 and the outer clamp body 9 are connected to the sliding arm 4 through a fastening connector 6. In this embodiment, the fastening connector 6 can be a bolt, and the inner clamp body 7 and the outer clamp body 9 can be detachably mounted on the sliding arm 4 by the bolt. When surface grinding is performed on parts with different arc shapes or sizes, different inner clamp bodies 7 and outer clamp bodies 9 can be replaced.

[0025] In this embodiment, the base includes a fixed base 1, a rotating base 3 rotatably matched with the fixed base 1, and a locking mechanism 2 located on the rotating base 3. The fixed base 1 can be fixed on the work surface of the equipment, and the rotating base 3 is installed on the fixed base 1. The rotating base 3 can be rotated around the fixed base 1 to adjust the position, and is fixed with the locking mechanism 2 after the position is adjusted.

[0026] like Figure 1 , 6 As shown, the sliding arm 4 includes a fixed portion 41 arranged on the base and a sliding portion 42 that can slide relative to the fixed portion 41. The rotating base 3 is provided with a mounting hole, and the adjustment handle 5 has a long axis extending into the sliding portion 42. Preferably, the mounting hole is a bolt hole, and one end of the long axis has a thread. The position adjustment of the sliding portion 42 is achieved by the cooperation of the long axis and the bolt hole.

[0027] The above are only preferred embodiments of the present invention. The protection scope of the present invention shall be based on the scope defined by the claims. Several improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall also be regarded as the protection scope of the present invention.

Claims

1. A combined positioning fixture for surface grinding of small arc segment parts, characterized in that: The invention comprises a base, a sliding arm (4) located on the base, and an adjusting handle (5) for adjusting the opening and closing distance of the sliding arm (4); the sliding arm (4) is provided with an inner clamp body (7) and an outer clamp body (9) arranged opposite to each other; the inner clamp body (7) is provided with a first arc-shaped positioning portion (71) and a first positioning step (72); the outer clamp body (9) is provided with a second arc-shaped positioning portion (91), a second positioning step (92) and an arc-shaped receiving groove (93).

2. A small arc segment part surface grinding combined positioning fixture according to claim 1, characterized in that: The base comprises a fixed base (1), a rotating base (3) rotatably matched with the fixed base (1), and a locking mechanism (2) located on the rotating base (3).

3. The combined positioning fixture for surface grinding of small arc parts according to claim 1 is characterized in that: The sliding arm (4) comprises a fixing portion (41) arranged on a base and a sliding portion (42) capable of sliding relative to the fixing portion (41).

4. The combined positioning fixture for surface grinding of small arc parts according to claim 1 is characterized in that: The inner clamp body (7) and the outer clamp body (9) are connected to the sliding arm (4) via a fastening connection piece (6).

5. The combined positioning fixture for surface grinding of small arc parts according to claim 1 is characterized in that: The first arc-shaped positioning portion (71) and the second arc-shaped positioning portion (91) are each provided with two recesses, forming three contact portions respectively.

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