Clamping and positioning device and clamping and positioning method

Abstract

The invention relates to a clamping and positioning device and a clamping and positioning method. The clamping and positioning device comprises an arc-shaped positioning piece which has magnetism and is in an arc shape, a first protruding part is formed on one side of the arc-shaped positioning piece in the arc length direction, a first concave part is formed on the other side of the arc-shaped positioning piece, and the first protruding part is matched with the first concave part in shape; the linear positioning sheet is magnetic, one side of the linear positioning sheet in the width direction is linear, a second convex part is formed on one side of the linear positioning sheet in the length direction, a second concave part is formed on the other side of the linear positioning sheet, and the second convex part is matched with the second concave part in shape; and the cylindrical pin is suitable for being inserted into the first positioning hole to fix two or more overlapped arc-shaped positioning sheets and is suitable for being inserted into the second positioning hole to fix two or more overlapped linear positioning sheets. The invention provides a clamping and positioning device and a clamping and positioning method, which are suitable for a rectangular table surface grinding machine and are used for fixing weak magnetic parts to facilitate surface grinding.

Description

Technical Field

[0001] The invention relates to the technical field of surface grinding, and in particular to a clamping and positioning device and a clamping and positioning method. Background Art

[0002] During the development and assembly of aircraft engine parts, some parts often need to be reworked or repaired due to external interference or size matching to meet the assembly requirements of the product. For example, sealing pieces, adjustment gaskets, pipe mounting seats, rocker arm assemblies and other components with multi-faceted assembly relationships often need to be ground due to inappropriate thickness or interference of assembly surfaces.

[0003] For surface grinding, the most commonly used equipment is the rectangular table surface grinder. The rectangular table has a magnetic suction function, which absorbs parts or part clamping fixtures through strong magnetic force, and then completes the grinding of the part surface. However, since most aircraft engine parts are made of materials such as 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 such parts, due to the weak magnetism of the parts, how to quickly, efficiently and economically complete the clamping and fixing of the parts is a problem that needs to be solved. The usual practice is to make a set of magnetic fixed clamping fixtures according to the outer dimensions of the parts to be processed, and to ensure that the processed parts have a good and stable clamping state through magnetic adsorption and fixation between the grinder rectangular table and the clamping fixture. Alternatively, the parts can be clamped directly with a vise, and the surface of the parts can be leveled before grinding.

[0004] For the above two traditional clamping methods, in the case of small batches and unfixed types of parts to be ground, if a special clamping tool is used for grinding, not only will the processing cost be high, the manufacturing cycle be long, and the tooling utilization rate be low, but also the timeliness is low for parts that require quick-reverse processing. Although the use of a vise can clamp parts quickly, the vise has certain limitations on the shape of the parts. For some round or irregular parts, it is difficult for the vise to ensure stable clamping of the parts so that they do not loosen or deflect. Summary of the invention

[0005] In view of the above problems in the prior art, the present invention proposes a clamping and positioning device and a clamping and positioning method, which are suitable for a rectangular table surface grinder and are used to fix weakly magnetic parts to facilitate surface grinding.

[0006] Specifically, the present invention proposes a clamping and positioning device suitable for a rectangular table surface grinder, wherein the clamping and fixing device comprises:

[0007] The arc-shaped positioning piece is magnetic and arc-shaped, with a first protrusion formed on one side along the arc length direction and a first recessed portion formed on the other side, the first protrusion and the first recessed portion are matched in shape, and adjacent arc-shaped positioning pieces are fixed by the first protrusion and the first recessed portion structure respectively, and a first positioning hole is provided on the first protrusion;

[0008] The linear positioning piece is magnetic, one side of which is in a straight line in the width direction, a second protrusion is formed on one side of the length direction, and a second recess is formed on the other side, the second protrusion matches the second recess in shape, adjacent linear positioning pieces are fixed by the second protrusion and the second recess in structure, and the second protrusion is provided with a second positioning hole;

[0009] The cylindrical pin is suitable for being inserted into the first positioning hole to fix two or more stacked arc-shaped positioning pieces, and is suitable for being 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 portion and a first head portion, and the first head portion is connected to one side of the arc-shaped positioning piece in the arc length direction through the first neck portion;

[0011] The first head is circular, and a diameter thereof is greater than a 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, and the second head is connected to one side of the linear positioning piece in the length direction through the second neck;

[0013] The second head portion is circular, and a diameter thereof is greater than a width of the second neck portion.

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

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

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

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

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

[0019] The present invention also provides a clamping and positioning method, which is applicable to the aforementioned clamping and positioning device, and comprises the steps of:

[0020] S1, selecting an adaptive arc-shaped positioning piece and / or a linear positioning piece according to the appearance characteristics of the weak magnetic part;

[0021] S2, placing 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, using a feeler gauge to check the clearance between the arc-shaped positioning piece and / or the linear positioning piece and the working surface of the rectangular table surface grinder to ensure that the clearance meets the clearance requirement;

[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 sheet and the linear positioning sheet and the thickness of the weakly magnetic part meet the surface grinding conditions. If not, it is necessary to superimpose the arc-shaped positioning sheet and / or the linear positioning sheet in step S2 to meet the surface grinding requirements.

[0025] The invention provides a clamping and positioning device, which is designed with arc-shaped positioning pieces and linear positioning pieces with magnetism, and is suitable for a rectangular table surface grinder and is used for fixing weakly magnetic parts to facilitate surface grinding.

[0026] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as described. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] In the attached figure:

[0029] Figure 1 A schematic structural diagram of a 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 The figure shows the use state of the clamping and positioning device according to one embodiment of the present invention.

[0032] Figure 4 A diagram showing the use status of a clamping and positioning device according to another embodiment of the present invention is shown.

[0033] Figure 5 A diagram showing the use status of a clamping and positioning device according to another embodiment of the present invention is shown.

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

[0035] Clamping and positioning device 100

[0036] Arc positioning piece 101

[0037] Linear positioning piece 102

[0038] Cylindrical pin 103

[0039] The first protrusion 104

[0040] The first recessed portion 105

[0041] First positioning hole 106

[0042] The second protrusion 107

[0043] The second recessed portion 108

[0044] The second positioning hole 109

[0045] First neck 110

[0046] The first head 111

[0047] Second neck 112

[0048] The second head 113

[0049] Irregular oval shaped thin sheet parts 114

[0050] Irregular round thin parts 115

[0051] Relatively thick parts 116 DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually merely illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0056] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

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

[0058] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

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

[0060] Among them, the arc-shaped positioning piece 101 is magnetic and arc-shaped. A first protrusion 104 is formed on one side of the arc length direction of the arc-shaped positioning piece 101, and a first recessed portion 105 is formed on the other side. The first protrusion 104 and the first recessed portion 105 match in shape. Adjacent arc-shaped positioning pieces 101 are fixed by the structural matching of their respective first protrusions 104 and first recessed portions 105. In other words, multiple arc-shaped positioning pieces 101 can be connected into a string by end-to-end splicing, 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 in the width direction is in a straight line, a second protrusion 107 is formed along one side of the linear positioning piece 102 in the length direction, and a second recessed portion 108 is formed on the other side. The second protrusion 107 matches the second recessed portion 108 in shape. Adjacent linear positioning pieces 102 are fixed by the structural matching of their respective second protrusions 107 and second recessed portions 108. In other words, multiple linear positioning pieces 102 can be connected into a string by end-to-end splicing, and then magnetically fixed on the working surface of the rectangular table surface grinder. The same side of multiple linear positioning pieces 102 is in a straight line, which is convenient for abutting against the flat side of weakly magnetic parts. A second positioning hole 109 is provided on the second protrusion 107.

[0062] The cylindrical pin 103 is suitable for inserting into the first positioning hole 106 aligned up and down to fix two or more stacked arc-shaped positioning pieces 101. According to the grinding requirements of weak magnetic parts, the stacked arc-shaped positioning pieces 101 are fixed by the cylindrical pin 103, which plays a role in strengthening the positioning and increasing the thickness of the arc-shaped positioning pieces 101. Similarly, the cylindrical pin 103 is suitable for inserting into the second positioning hole 109 aligned up and down to fix two or more stacked linear positioning pieces 102, which plays a role in strengthening the positioning and increasing the thickness of the linear positioning pieces 102.

[0063] Preferably, the first protruding portion 104 includes a first neck portion 110 and a first head portion 111. The first head portion 111 is connected to one side of the arc-length direction of the arc-shaped positioning piece 101 through the first neck portion 110. The first head portion 111 is circular, and its diameter is greater than the width of the first neck portion 110, so that when the two arc-shaped positioning pieces 101 are spliced ​​end to end, the first head portion 111 of one arc-shaped positioning piece 101 is difficult to escape from the first recessed portion 105 of the other arc-shaped positioning piece 101 that cooperates with each other on the working plane, so that the overall structure is stable.

[0064] Preferably, the second protruding portion 107 includes a second neck portion 112 and a second head portion 113. The second head portion 113 is connected to one side of the linear positioning piece 102 in the length direction through the second neck portion 112. The second head portion 113 is circular, and its diameter is greater than the width of the second neck portion 112. In this way, after the two linear positioning pieces 102 are spliced ​​end to end, the second head portion 113 of one linear positioning piece 102 is difficult to escape from the second recessed portion 108 of the other matching linear positioning piece 102 on the working plane, so that the overall structure is stable.

[0065] Preferably, the arc angles of the arc-shaped positioning piece 101 on both sides along the arc length direction are the same.

[0066] Preferably, the arc-shaped positioning piece 101 and the linear positioning piece 102 are made of magnetizable martensitic stainless steel. As an example but not a limitation, the arc-shaped positioning piece 101 and the linear positioning piece 102 can also be made of a magnetizable metal material with a certain 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 processed by wire cutting. The splicing structure of the arc-shaped positioning piece 101 and the linear positioning piece 102 is conducive to processing and manufacturing.

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

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

[0070] The present invention also provides a clamping and positioning method, which is 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 in the figure, the clamping and positioning method includes the following steps:

[0071] S1, selecting an adaptive arc-shaped positioning piece 101 and / or a linear positioning piece 102 according to the appearance characteristics of the weak magnetic part;

[0072] S2, place the weak magnetic part and the selected arc positioning piece 101 and / or linear positioning piece 102 on the working surface of the rectangular table surface grinder, so that the arc positioning piece 101 and / or linear positioning piece 102 are spliced ​​and / or overlapped to fit the outer side of the weak magnetic part to achieve the position limiting of the weak magnetic part. Ensure that the arc positioning piece 101 and / or linear positioning piece 102 can limit the weak magnetic part in the four directions of up, down, left, and right, and achieve a better fixing effect.

[0073] S3, use a feeler gauge to check the gap between the arc locating piece 101 and / or the linear locating piece 102 and the working surface of the rectangular table surface grinder to ensure that the gap meets the gap requirements. Conventionally, it is best if there is no gap between the bottom surface of the arc locating piece 101 and the linear locating piece 102 and the working surface of the rectangular table surface grinder. Local gaps are allowed, but the gap value shall not be greater than 0.02mm, and the gap area shall not exceed 20% of the total contact area. If the gap is unqualified, the arc locating piece 101 and the linear locating piece 102 should be calibrated, or replaced with qualified locating pieces.

[0074] S4, the working surface of the rectangular table surface grinder is magnetized to fix the arc-shaped positioning piece 101 and / or the linear positioning piece 102 by magnetic attraction, so as to prepare for surface grinding of the weakly magnetic parts.

[0075] Preferably, in step S1, it is determined whether the thickness of the arcuate positioning piece 101 and the linear positioning piece 102 and the thickness of the weak magnetic part meet the surface grinding conditions. If not, it is necessary to superimpose the arcuate positioning piece 101 and / or the linear positioning piece 102 in step S2 to meet the surface grinding requirements. For example, if the final thickness of the weak magnetic part to be ground after grinding is δ, if the arcuate positioning piece 101 is fixed, the surface grinding condition satisfied by the thickness δ1 of the superimposed arcuate positioning piece 101 is: 1 / 2δ≤δ1<δ. If the thickness of a single arcuate positioning piece 101 already meets this requirement, there is no need to superimpose it. Similarly, this plane non-smiling condition applies to the linear positioning piece 102.

[0076] The specific implementation scheme of the clamping and positioning device 100 for surface grinding of weakly magnetic thin-film parts is described in detail below in conjunction with the accompanying drawings.

[0077] Figure 3 The following is a diagram showing the use state of a clamping and positioning device according to an embodiment of the present invention. As shown in the figure, the weakly magnetic part to be ground is an irregular elliptical thin sheet part 114. The clamping and positioning method comprises the following steps:

[0078] S1, select an arc-shaped positioning piece 101 according to the irregular elliptical shape. The thickness of the irregular elliptical thin sheet part 114 before grinding is 2.15mm, and the required thickness value δ after grinding is 2.0mm. The thickness of the arc-shaped positioning piece 101 is selected to be 1.5±0.1mm. According to the surface grinding conditions, the thickness of a single arc-shaped positioning piece 101 has satisfied 1 / 2δ≤δ1<δ, so there is no need to superimpose the arc-shaped positioning piece 101.

[0079] S2, place the irregular elliptical thin-film part 114 and the selected arc-shaped positioning piece 101 on the working surface of the rectangular table surface grinder. Three arc-shaped positioning pieces 101 are spliced ​​end to end on the left and right sides of the irregular elliptical thin-film part 114. As shown in the figure, the first protrusion 104 is fixed with the first recessed part 105. Since the diameter of the first head 111 is slightly larger than the first neck 110, the first head 111 cannot escape from the first recessed part 105 on the working surface of the rectangular table surface grinder, and the adjacent arc-shaped positioning pieces 101 form a stable structure. The arc-shaped positioning pieces 101 on the left and right sides form a clamping structure for the irregular elliptical thin-film part 114 to achieve the purpose of limiting.

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

[0081] S4, the working surface of the rectangular table surface grinder is magnetized to fix the arc-shaped positioning piece 101 by magnetic attraction, and prepares to perform surface grinding on the irregular elliptical thin-film part 114.

[0082] Figure 4 The following is a diagram showing the use state of a clamping and positioning device according to another embodiment of the present invention. As shown in the figure, the weakly magnetic part to be ground is an irregular circular thin sheet part 115. The clamping and positioning method comprises the following steps:

[0083] S1, selecting an adapted arc-shaped positioning piece 101 according to the irregular circle. In this embodiment, the thickness of a single arc-shaped positioning piece 101 has met the surface grinding conditions, so there is no need to superimpose the arc-shaped positioning piece 101.

[0084] S2, place the irregular circular thin sheet part 115 and the selected arc-shaped positioning piece 101 on the working surface of the rectangular table surface grinder. Arrange an arc-shaped positioning piece 101 on the upper and lower inner sides of the irregular circular thin sheet part 115, and use three arc-shaped positioning pieces 101 on the outer side of the irregular circular thin sheet part 115 in a substantially evenly spaced manner. The five arc-shaped positioning pieces 101 shown in the figure have formed a clamping structure for the irregular circular thin sheet part 115, achieving the purpose of limiting. As an example but not a limitation, more arc-shaped positioning pieces 101 can also be used for limiting.

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

[0086] S4, the working surface of the rectangular table surface grinder is magnetized to fix the arc-shaped positioning piece 101 by magnetic attraction, and prepare to perform surface grinding on the irregular circular thin sheet part 115.

[0087] Figure 5 The following is a diagram showing the use state of a clamping and positioning device according to another embodiment of the present invention. As shown in the figure, the weakly magnetic part to be ground is a relatively thick part 116 with a flat edge. The clamping and positioning method comprises the following steps:

[0088] S1, select the appropriate linear positioning piece 102 according to the flat edge. The thickness of the relatively thick part 116 before grinding is 3.56mm, and the required thickness value δ after grinding is 3.48mm~3.50mm. The thickness of the selected linear positioning piece 102 is 1.5±0.1mm. According to the surface grinding conditions, the thickness δ1 (3.0±0.2mm) of the two stacked linear positioning pieces 102 can satisfy 1 / 2δ≤δ1<δ.

[0089] S2, place the relatively thick part 116 with a flat edge and the selected linear positioning piece 102 on the working surface of the rectangular table surface grinder. As shown in the figure. Four linear positioning pieces 102 are used on the upper edge of the relatively thick part 116, and they are spliced ​​end to end and then stacked on the working surface. The second protrusion 107 of each adjacent linear positioning piece 102 is fixed with the second recessed portion 108. Since the diameter of the second head 113 is slightly larger than the second neck 112, the second head 113 cannot escape from the second recessed portion 108 on the working surface of the rectangular table surface grinder, and the adjacent linear positioning pieces 102 form a stable structure. The stacked linear positioning pieces 102 are aligned with the second positioning hole 109 of the second protrusion 107. A cylindrical pin 103 with a length of 3.0 mm is inserted into the second positioning hole 109 for fixing. Similarly, four linear positioning pieces 102 are used to limit the lower edge of the relatively thick part 116. Two linear positioning pieces 102 are arranged on the left and right sides of the relatively thick part 116, without splicing, and only need to overlap two linear positioning pieces 102 and fix them by cylindrical pins 103. The linear positioning pieces 102 shown in the figure have formed a clamping structure for the relatively thick part 116 with a flat edge in four directions of up, down, left and right, so as to achieve the purpose of limiting.

[0090] S3, use a feeler gauge to check the clearance between the linear positioning piece 102 and the working surface of the rectangular table surface grinder to ensure that the clearance meets the clearance requirement.

[0091] S4, the working surface of the rectangular table surface grinder is magnetized to fix the linear positioning piece 102 by magnetic attraction, and prepares for surface grinding of the relatively thick part 116.

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

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

[0094] 2. Fixing by cylindrical pins allows the arc-shaped positioning piece and the linear positioning piece to have a certain thickness in an overlapping manner, thereby improving the limiting effect;

[0095] 3. The overall structure of the clamping and positioning device is simple, the clamping is simple and flexible, and it can be used for surface grinding of parts of various shapes;

[0096] 4. Realize rapid processing, shorten construction period and reduce costs.

[0097] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A clamping and positioning device, suitable for a rectangular table surface grinder, the clamping and fixing device comprising: The arc-shaped positioning piece is magnetic and arc-shaped, with a first protrusion formed on one side along the arc length direction and a first recessed portion formed on the other side, the first protrusion and the first recessed portion are matched in shape, and adjacent arc-shaped positioning pieces are fixed by the first protrusion and the first recessed portion structure respectively, and a first positioning hole is provided on the first protrusion; The linear positioning piece is magnetic, one side of which is in a straight line in the width direction, a second protrusion is formed on one side of the length direction, and a second recess is formed on the other side, the second protrusion matches the second recess in shape, adjacent linear positioning pieces are fixed by the second protrusion and the second recess in structure, and the second protrusion is provided with a second positioning hole; The cylindrical pin is suitable for being inserted into the first positioning hole to fix two or more stacked arc-shaped positioning pieces, and is suitable for being inserted into the second positioning hole to fix two or more stacked linear positioning pieces.

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

3. The clamping and positioning device according to claim 1, characterized in that: The second protrusion includes a second neck and a second head, and the second head is connected to one side of the linear positioning piece in the length direction through the second neck; The second head portion is circular, and a diameter thereof is greater than a width of the second neck portion.

4. The clamping and positioning device according to claim 1, characterized in that: The arc length directions of the arc-shaped positioning pieces have the same arc angle on both sides.

5. The clamping and positioning device according to claim 1, characterized in that: The arc-shaped positioning piece and the linear positioning piece are made of magnetizable martensitic stainless steel.

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

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

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

9. A clamping and positioning method, applicable to the clamping and positioning device according to claim 1, characterized in that: Includes steps: S1, selecting an adaptive arc-shaped positioning piece and / or a linear positioning piece according to the appearance characteristics of the weak magnetic part; S2, placing 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, using a feeler gauge to check the clearance between the arc-shaped positioning piece and / or the linear positioning piece and the working surface of the rectangular table surface grinder to ensure that the clearance meets the clearance requirement; S4, the working surface of the rectangular table surface grinder is magnetized.

10. The clamping and positioning method according to claim 9, characterized in that: In step S1, determine whether the thickness of the arcuate positioning piece and the linear positioning piece and the thickness of the weak magnetic part meet the surface grinding conditions. If not, it is necessary to superimpose the arcuate positioning piece and / or the linear positioning piece in step S2 to meet the surface grinding requirements.

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