A clamping positioning device and a clamping positioning method

Abstract

The present application relates to a kind of clamping positioning device and clamping positioning method.The clamping positioning device includes arc positioning sheet, with magnetism, arc, first protruding portion is formed in the side along its arc length direction, first recess portion is formed in the other side, first protruding portion and first recess portion shape cooperation;Linear positioning sheet, with magnetism, in the linear form in the side in its width direction, second protruding portion is formed in the side along its length direction, second recess portion is formed in the other side, second protruding portion and second recess portion shape cooperation;Cylindrical pin, suitable for inserting first positioning hole to fix two pieces or more pieces of stacked arc positioning sheet, and suitable for inserting second positioning hole to fix two pieces or more pieces of stacked linear positioning sheet.The present application proposes a kind of clamping positioning device and clamping positioning method, suitable for square platform surface grinding machine, for fixing weak magnetic parts to facilitate surface grinding.

Description

Technical Field

[0001] This invention relates to the field of surface grinding technology, and in particular to a clamping and positioning device and a clamping and positioning method. Background Technology

[0002] During the research and assembly of aero-engine components, some parts often require rework or repair due to factors such as shape interference or dimensional mismatch to meet the product's assembly requirements. For example, components with multi-faceted mating relationships, such as sealing plates, adjusting shims, pipe mounting brackets, and rocker arm assemblies, often require surface grinding due to unsuitable part thickness or interference between mating surfaces.

[0003] For surface grinding, the most commonly used equipment is the rectangular table surface grinder. The rectangular table has a magnetic attraction function, using strong magnetic force to attract parts or their clamping fixtures, and then completing the grinding process on the part's surface. However, since most aero-engine components are manufactured using high-temperature alloys, titanium alloys, or high-quality stainless steel, these materials are usually non-magnetic or weakly magnetic. When using a rectangular table surface grinder to grind the surface of these parts, the problem of how to quickly, efficiently, and economically clamp and fix the parts, given their weak magnetism, needs to be solved. The usual approach is to create a magnetic clamping fixture based on the dimensions of the part to be processed, and then use the magnetic attraction between the grinding machine's rectangular table and the clamping fixture to ensure a stable clamping state for the workpiece. Alternatively, a vise can be used to clamp the part, level the surface, and then perform the grinding process.

[0004] For the two traditional clamping methods mentioned above, in the case of small batches and variable types of parts to be ground, using dedicated clamping fixtures for grinding not only results in high processing costs, long manufacturing cycles, and low tooling utilization, but also low timeliness for parts requiring rapid turnaround. While vises can clamp parts relatively quickly, they have certain limitations regarding the shape of the parts. For some round or irregularly shaped parts, vises have difficulty ensuring stable clamping and preventing loosening or wobble. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention proposes a clamping and positioning device and method, applicable to a rectangular table surface grinder, for fixing weakly magnetic parts to facilitate surface grinding.

[0006] Specifically, this invention proposes a clamping and positioning device suitable for rectangular table surface grinders, wherein the clamping and fixing device includes:

[0007] An arc-shaped positioning piece is magnetic and arc-shaped. A first protrusion is formed on one side along its arc length, and a first recess is formed on the other side. The first protrusion and the first recess are shaped to match each other. Adjacent arc-shaped positioning pieces are fixed by their respective first protrusions and first recesses. A first positioning hole is provided on the first protrusion.

[0008] A linear positioning piece is magnetic, and is straight on one side in its width direction. A second protrusion is formed on one side in its length direction, and a second recess is formed on the other side. The second protrusion and the second recess are shaped to fit together. Adjacent linear positioning pieces are fixed by their respective second protrusions and second recesses. A second positioning hole is provided on the second protrusion.

[0009] A cylindrical pin is adapted to be inserted into the first positioning hole to fix two or more stacked arc-shaped positioning pieces, and is also adapted to be inserted into the second positioning hole to fix two or more stacked linear positioning pieces.

[0010] According to one embodiment of the present invention, the first protrusion includes a first neck and a first head, wherein the first head is connected to one side of the arcuate positioning piece in the arc length direction via the first neck;

[0011] The first head is circular, and its diameter is greater than the width of the first neck.

[0012] According to one embodiment of the present invention, the second protrusion includes a second neck and a second head, wherein the second head is connected to one side of the linear positioning piece in the length direction via the second neck;

[0013] The second head is round, and its diameter is greater than the width of the second neck.

[0014] According to one embodiment of the present invention, the arc-shaped positioning piece has the same curvature on both sides along its arc length direction.

[0015] According to one embodiment of the present invention, the arc-shaped positioning plate and the linear positioning plate are made of magnetizable martensitic stainless steel.

[0016] According to one embodiment of the present invention, the thickness of the arc-shaped positioning piece and the linear positioning piece is 0.5 to 1.5 mm.

[0017] According to one embodiment of the present invention, the length of the cylindrical pin is 1.5 to 3.0 mm.

[0018] According to one embodiment of the present invention, the surface flatness of the arc-shaped positioning piece and the linear positioning piece is ≤0.02mm.

[0019] The present invention also provides a clamping and positioning method applicable to the aforementioned clamping and positioning device, comprising the following steps:

[0020] S1, Select suitable arc-shaped positioning plates and / or linear positioning plates according to the shape characteristics of the weak magnetic parts;

[0021] S2, place the weak magnetic part and the selected arc-shaped positioning piece and / or linear positioning piece on the working surface of the rectangular table surface grinder, so that the arc-shaped positioning piece and / or linear positioning piece fits the weak magnetic part to achieve positioning;

[0022] S3. Use a feeler gauge to check the gap between the arc-shaped positioning plate and / or the linear positioning plate and the working surface of the rectangular table surface grinder to ensure that the gap meets the requirements.

[0023] S4, the working surface of the rectangular table surface grinder is magnetized.

[0024] According to one embodiment of the present invention, in step S1, it is determined whether the thickness of the arc-shaped positioning plate and the linear positioning plate and the thickness of the weak magnetic part meet the surface grinding conditions. If they do not meet the conditions, the arc-shaped positioning plate and / or the linear positioning plate need to be superimposed in step S2 to meet the surface grinding requirements.

[0025] The present invention provides a clamping and positioning device, which is designed with magnetic arc-shaped positioning plates and linear positioning plates, and is suitable for rectangular table surface grinders to fix weakly magnetic parts to facilitate surface grinding.

[0026] It should be understood that the above general description and the following detailed description of the present invention are exemplary and illustrative, and are intended to provide further explanation of the present invention. Attached Figure Description

[0027] The accompanying drawings are included to provide a further understanding of the invention. They are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the invention and, together with this specification, serve to explain the principles of the invention.

[0028] In the attached image:

[0029] Figure 1 A schematic diagram of the clamping and positioning device according to an embodiment of the present invention is shown.

[0030] Figure 2 A flowchart of a clamping and positioning method according to an embodiment of the present invention is shown.

[0031] Figure 3 A diagram showing the usage state of a clamping and positioning device according to an embodiment of the present invention is provided.

[0032] Figure 4 A diagram showing the usage state of a clamping and positioning device according to another embodiment of the present invention is provided.

[0033] Figure 5 A diagram showing the usage state of a clamping and positioning device according to another embodiment of the present invention is provided.

[0034] The above figures include the following reference numerals:

[0035] Clamping and positioning device 100

[0036] Arc-shaped positioning piece 101

[0037] Linear positioning piece 102

[0038] Cylindrical pin 103

[0039] First protrusion 104

[0040] First recess 105

[0041] First positioning hole 106

[0042] Second protrusion 107

[0043] Second recess 108

[0044] Second positioning hole 109

[0045] First neck 110

[0046] First head 111

[0047] Second neck 112

[0048] Second head 113

[0049] Irregularly oval-shaped thin sheet parts 114

[0050] Irregular circular thin sheet parts 115

[0051] Relatively thick parts 116 Detailed Implementation

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0056] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0058] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0059] Figure 1 A schematic diagram of a clamping and positioning device according to an embodiment of the present invention is shown. As shown, a clamping and positioning device 100 suitable for a rectangular table surface grinder mainly includes an arc-shaped positioning plate 101, a linear positioning plate 102, and a cylindrical pin 103.

[0060] The arc-shaped positioning piece 101 is magnetic and arc-shaped. A first protrusion 104 is formed on one side along the arc length of the arc-shaped positioning piece 101, and a first recess 105 is formed on the other side. The first protrusion 104 and the first recess 105 are shaped to fit together. Adjacent arc-shaped positioning pieces 101 are fixed by the structural cooperation of their respective first protrusions 104 and first recesses 105. That is to say, multiple arc-shaped positioning pieces 101 can be connected end to end to form a series and then magnetically fixed on the working surface of the rectangular table surface grinder. A first positioning hole 106 is provided on the first protrusion 104.

[0061] The linear positioning piece 102 is magnetic. One side of the linear positioning piece 102 is straight in the width direction, and a second protrusion 107 is formed on one side along its length direction, while a second recess 108 is formed on the other side. The second protrusion 107 and the second recess 108 are shaped to fit together. Adjacent linear positioning pieces 102 are fixed by the structural fit between their respective second protrusions 107 and second recesses 108. That is, multiple linear positioning pieces 102 can be connected end-to-end in a series and magnetically fixed to the working surface of the rectangular table surface grinder. The fact that the same side of the multiple linear positioning pieces 102 is straight facilitates contact with the flat side surface of a weakly magnetic part. A second positioning hole 109 is provided on the second protrusion 107.

[0062] The cylindrical pin 103 is adapted to be inserted into the vertically aligned first positioning hole 106 to fix two or more stacked arc-shaped positioning pieces 101. According to the grinding requirements of the weakly magnetic parts, the cylindrical pin 103 is used to fix the stacked arc-shaped positioning pieces 101, thereby strengthening the positioning and increasing the thickness of the arc-shaped positioning pieces 101. Similarly, the cylindrical pin 103 is adapted to be inserted into the vertically aligned second positioning hole 109 to fix two or more stacked linear positioning pieces 102, thereby strengthening the positioning and increasing the thickness of the linear positioning pieces 102.

[0063] Preferably, the first protrusion 104 includes a first neck 110 and a first head 111. The first head 111 is connected to one side of the arc-shaped positioning piece 101 along its arc length direction via the first neck 110. The first head 111 is circular, and its diameter is larger than the width of the first neck 110. This makes it difficult for the first head 111 of one arc-shaped positioning piece 101 to disengage from the first recess 105 of the other arc-shaped positioning piece 101 on the working plane after the two arc-shaped positioning pieces 101 are joined end to end, thus ensuring the overall structure is stable.

[0064] Preferably, the second protrusion 107 includes a second neck 112 and a second head 113. The second head 113 is connected to one side of the linear positioning piece 102 along its length via the second neck 112. The second head 113 is circular, with a diameter greater than the width of the second neck 112. This ensures that after the two linear positioning pieces 102 are joined end-to-end, the second head 113 of one linear positioning piece 102 is difficult to dislodge from the second recess 108 of the other mating linear positioning piece 102 on the working plane, resulting in a stable overall structure.

[0065] Preferably, the arc-shaped positioning piece 101 has the same curvature on both sides along its arc length direction.

[0066] Preferably, the arc-shaped positioning piece 101 and the linear positioning piece 102 are made of magnetizable martensitic stainless steel. By way of example and not limitation, the arc-shaped positioning piece 101 and the linear positioning piece 102 may also be made of a magnetizable metal material with a certain degree of hardness.

[0067] Preferably, the thickness of the arc-shaped positioning piece 101 and the linear positioning piece 102 is 0.5–1.5 mm. More preferably, the arc-shaped positioning piece 101 and the linear positioning piece 102 are manufactured by wire cutting. The splicing structure of the arc-shaped positioning piece 101 and the linear positioning piece 102 is beneficial for manufacturing.

[0068] Preferably, the length of the cylindrical pin 103 is 1.5 to 3.0 mm.

[0069] Preferably, the surface flatness of the arc-shaped positioning piece 101 and the linear positioning piece 102 is ≤0.02mm.

[0070] The present invention also provides a clamping and positioning method applicable to the aforementioned clamping and positioning device 100. Figure 2 A flowchart of a clamping and positioning method according to an embodiment of the present invention is shown. As shown, the clamping and positioning method includes the following steps:

[0071] S1. Select the appropriate arc-shaped positioning piece 101 and / or linear positioning piece 102 according to the shape characteristics of the weak magnetic part.

[0072] S2, place the weak magnetic component and the selected arc-shaped positioning piece 101 and / or linear positioning piece 102 on the working surface of the rectangular table surface grinder, so that the arc-shaped positioning piece 101 and / or linear positioning piece 102 are spliced ​​and / or stacked to fit the outer side of the weak magnetic component to limit the movement of the weak magnetic component. This ensures that the arc-shaped positioning piece 101 and / or linear positioning piece 102 limit the weak magnetic component in all four directions (up, down, left, and right), achieving a good fixing effect.

[0073] S3. Use a feeler gauge to check the clearance between the arc-shaped locating plate 101 and / or the linear locating plate 102 and the working surface of the rectangular table surface grinder to ensure it meets the clearance requirements. Ideally, there should be no clearance between the bottom surface of the arc-shaped locating plate 101 and the linear locating plate 102 and the working surface of the rectangular table surface grinder. Local clearance is permissible, but the clearance value must not exceed 0.02 mm, and the clearance area should not exceed 20% of the total contact area. If the clearance is unacceptable, the arc-shaped locating plate 101 and the linear locating plate 102 should be corrected, or qualified locating plates should be replaced.

[0074] S4, the working surface of the rectangular table surface grinder is magnetized to fix the arc-shaped positioning plate 101 and / or the linear positioning plate 102 with magnetic attraction, in preparation for surface grinding of weakly magnetic parts.

[0075] Preferably, in step S1, it is determined whether the thicknesses of the arc-shaped positioning piece 101 and the linear positioning piece 102 meet the planar grinding conditions for the thickness of the weakly magnetic part. If not, in step S2, the arc-shaped positioning piece 101 and / or the linear positioning piece 102 need to be stacked to meet the planar grinding requirements. For example, if the final thickness of the weakly magnetic part to be ground is δ, and the arc-shaped positioning piece 101 is used for fixing, the planar grinding condition satisfied by the thickness δ1 of the stacked arc-shaped positioning piece 101 is: 1 / 2δ ≤ δ1 < δ. If the thickness of a single arc-shaped positioning piece 101 already meets this requirement, then stacking is unnecessary. Similarly, this planar grinding condition applies to the linear positioning piece 102.

[0076] The following, in conjunction with the accompanying drawings, provides a detailed description of the specific implementation scheme of the clamping and positioning device 100 for surface grinding of weakly magnetic thin sheet parts.

[0077] Figure 3 A diagram illustrating the usage state of a clamping and positioning device according to an embodiment of the present invention is shown. As shown, the weakly magnetic part to be ground is an irregularly elliptical thin sheet part 114. The clamping and positioning method includes the following steps:

[0078] S1. Select a suitable arc-shaped positioning piece 101 based on the irregular elliptical shape. The thickness of the irregular elliptical thin sheet part 114 before grinding is 2.15mm, and the required thickness δ after grinding is 2.0mm. The thickness of the selected arc-shaped positioning piece 101 is 1.5±0.1mm. According to the plane grinding conditions, the thickness of a single arc-shaped positioning piece 101 already satisfies 1 / 2δ≤δ1<δ, so there is no need to stack arc-shaped positioning pieces 101.

[0079] S2, the irregularly elliptical thin sheet part 114 and the selected arc-shaped positioning plates 101 are placed on the working surface of the rectangular table surface grinder. Three arc-shaped positioning plates 101 are spliced ​​end to end on each side of the irregularly elliptical thin sheet part 114. As shown in the figure, the first protrusion 104 and the first recess 105 are fitted and fixed together. Since the diameter of the first head 111 is slightly larger than the first neck 110, the first head 111 cannot be dislodged from the first recess 105 on the working surface of the rectangular table surface grinder, and the adjacent arc-shaped positioning plates 101 form a stable structure. The arc-shaped positioning plates 101 on the left and right sides form a clamping structure for the irregularly elliptical thin sheet part 114, achieving the purpose of limiting positioning.

[0080] S3. Use a feeler gauge to check the gap between the arc-shaped positioning plate 101 and the working surface of the rectangular table surface grinder to ensure that the gap meets the requirements.

[0081] S4, the working surface of the rectangular table surface grinder is magnetized to fix the arc-shaped positioning plate 101 with magnetic attraction, in preparation for surface grinding of the irregular elliptical thin sheet part 114.

[0082] Figure 4 A diagram illustrating the usage state of a clamping and positioning device according to another embodiment of the present invention is shown. As shown, the weakly magnetic part to be ground is an irregularly shaped circular thin sheet part 115. The clamping and positioning method includes the following steps:

[0083] S1. Select a suitable arc-shaped positioning piece 101 based on the irregular circle. In this embodiment, the thickness of a single arc-shaped positioning piece 101 already meets the requirements for surface grinding, so there is no need to stack arc-shaped positioning pieces 101.

[0084] S2, place the irregular circular thin sheet part 115 and the selected arc-shaped locating plates 101 on the working surface of the rectangular table surface grinder. One arc-shaped locating plate 101 is arranged on the upper and lower inner sides of the irregular circular thin sheet part 115, and three arc-shaped locating plates 101 are arranged at approximately equal intervals on the outer side of the irregular circular thin sheet part 115. The five arc-shaped locating plates 101 shown in the figure form a clamping structure for the irregular circular thin sheet part 115, achieving the purpose of limiting its position. As an example and not a limitation, more arc-shaped locating plates 101 can also be used for limiting the position.

[0085] S3. Use a feeler gauge to check the gap between the arc-shaped positioning plate 101 and the working surface of the rectangular table surface grinder to ensure that the gap meets the requirements.

[0086] S4, the working surface of the rectangular table surface grinder is magnetized to fix the arc-shaped positioning plate 101 with magnetic attraction, in preparation for surface grinding of the irregular circular thin sheet part 115.

[0087] Figure 5 A diagram illustrating the usage state of a clamping and positioning device according to another embodiment of the present invention is shown. As shown, the weakly magnetic part to be ground is a relatively thick part 116 with flat edges. The clamping and positioning method includes the following steps:

[0088] S1. Select a suitable linear locating piece 102 based on the flattened edge. The relatively thick part 116 has a thickness of 3.56 mm before grinding, and the required thickness δ after grinding is 3.48 mm to 3.50 mm. The thickness of the selected linear locating piece 102 is 1.5 ± 0.1 mm. According to the surface grinding conditions, the thickness δ1 (3.0 ± 0.2 mm) of the two stacked linear locating pieces 102 can satisfy 1 / 2δ ≤ δ1 < δ.

[0089] S2, place the relatively thick part 116 with flat edges and the selected linear positioning plates 102 on the working surface of the rectangular table surface grinder, as shown in the figure. Four linear positioning plates 102 are used on the upper edge of the relatively thick part 116, joined end-to-end in pairs and then stacked on the working surface. The second protrusion 107 and second recess 108 of each of the two adjacent linear positioning plates 102 are fitted and fixed. Since the diameter of the second head 113 is slightly larger than the second neck 112, the second head 113 cannot dislodge from the second recess 108 on the working surface of the rectangular table surface grinder, forming a stable structure with the adjacent linear positioning plates 102. The stacked linear positioning plates 102 are aligned with the second positioning holes 109 of the second protrusion 107. A 3.0 mm long cylindrical pin 103 is inserted into the second positioning hole 109 for fixation. Similarly, four linear positioning plates 102 are used for positioning on the lower edge of the relatively thick part 116. Two linear positioning plates 102 are arranged on each of the left and right sides of the relatively thick part 116. No splicing is required; simply stack the two linear positioning plates 102 and fix them with cylindrical pins 103. The linear positioning plates 102 shown in the figure form a clamping structure for the relatively thick part 116 with flat edges in four directions (up, down, left, and right), achieving the purpose of limiting positioning.

[0090] S3. Use a feeler gauge to check the gap between the linear positioning plate 102 and the working surface of the rectangular table surface grinder to ensure that the gap meets the requirements.

[0091] S4, the working surface of the rectangular table surface grinder is magnetized to fix the linear positioning plate 102 with magnetic attraction, in preparation for surface grinding of the relatively thick part 116.

[0092] The clamping and positioning device and method provided by the present invention have the following advantages:

[0093] 1. The concave and convex structure of the arc-shaped positioning piece and the linear positioning piece allows the two types of positioning pieces to be spliced ​​and extended in the length direction;

[0094] 2. By fixing with cylindrical pins, the arc-shaped positioning piece and the linear positioning piece are stacked to obtain a certain thickness, thereby improving the limiting effect;

[0095] 3. The clamping and positioning device has a simple overall structure, is easy and flexible to clamp, and is suitable for surface grinding of parts of various shapes;

[0096] 4. Enables rapid processing, shortens the production cycle, and reduces costs.

[0097] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A clamping and positioning device, suitable for a rectangular table surface grinder, wherein the clamping and fixing device comprises: An arc-shaped positioning piece is magnetic and arc-shaped. A first protrusion is formed on one side along its arc length, and a first recess is formed on the other side. The first protrusion and the first recess are shaped to match each other. Adjacent arc-shaped positioning pieces are fixed by their respective first protrusions and first recesses. A first positioning hole is provided on the first protrusion. A linear positioning piece is magnetic, and is straight on one side in its width direction. A second protrusion is formed on one side in its length direction, and a second recess is formed on the other side. The second protrusion and the second recess are shaped to fit together. Adjacent linear positioning pieces are fixed by their respective second protrusions and second recesses. A second positioning hole is provided on the second protrusion. A cylindrical pin is adapted to be inserted into the first positioning hole to fix two or more stacked arc-shaped positioning pieces, and is also adapted to be inserted into the second positioning hole to fix two or more stacked linear positioning pieces.

2. The clamping and positioning device as described in claim 1, characterized in that, The first protrusion includes a first neck and a first head, and the first head is connected to one side of the arc-shaped positioning piece in the arc length direction through the first neck; The first head is circular, and its diameter is greater than the width of the first neck.

3. The clamping and positioning device as described in claim 1, characterized in that, The second protrusion includes a second neck and a second head, the second head being connected to one side of the linear positioning piece along its length via the second neck; The second head is round, and its diameter is greater than the width of the second neck.

4. The clamping and positioning device as described in claim 1, characterized in that, The arc-shaped positioning piece has the same curvature on both sides along its arc length direction.

5. The clamping and positioning device as described in claim 1, characterized in that, The arc-shaped positioning plate and the linear positioning plate are made of magnetizable martensitic stainless steel.

6. The clamping and positioning device as described in claim 1, characterized in that, The thickness of the arc-shaped positioning piece and the linear positioning piece is 0.5 to 1.5 mm.

7. The clamping and positioning device as described in claim 6, characterized in that, The length of the cylindrical pin is 1.5 to 3.0 mm.

8. The clamping and positioning device as described in claim 1, characterized in that, The surface flatness of the arc-shaped positioning piece and the linear positioning piece is ≤0.02mm.

9. A clamping and positioning method, applicable to the clamping and positioning device as described in claim 1, characterized in that, Including the following steps: S1. Select suitable arc-shaped positioning plates and / or linear positioning plates according to the shape characteristics of the weakly magnetic parts. S2, place the weak magnetic part and the selected arc-shaped positioning piece and / or linear positioning piece on the working surface of the rectangular table surface grinder, so that the arc-shaped positioning piece and / or linear positioning piece fits the weak magnetic part to achieve positioning; S3. Use a feeler gauge to check the gap between the arc-shaped positioning plate and / or the linear positioning plate and the working surface of the rectangular table surface grinder to ensure that the gap meets the requirements. S4, the working surface of the rectangular table surface grinder is magnetized.

10. The clamping and positioning method as described in claim 9, characterized in that, In step S1, it is determined whether the thickness of the arc-shaped positioning plate and the linear positioning plate meets the surface grinding conditions with the thickness of the weak magnetic part. If not, the arc-shaped positioning plate and / or the linear positioning plate need to be superimposed in step S2 to meet the surface grinding requirements.

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