A metal material sample polishing fixture and operation method thereof

Abstract

The present invention discloses a metal material sample polishing fixture and an operating method thereof, comprising a main body, a screw is arranged at the bottom axis of the main body, an arc-shaped guide surface is formed by transition between the upper part of the screw and the main body, a nut is assembled on the screw, a plurality of assembly grooves are arranged in an annular manner on the outer wall of the nut, a clamping claw is assembled in the assembly groove, a right-angle clamping groove is processed on the bottom of the clamping claw, a rear contact surface is formed after the arc-shaped transition at the upper end of the clamping claw, when the clamping claw moves upward, the contact surface acts on the arc-shaped guide surface, and as the nut continues to rotate upward, the lower ends of the plurality of clamping claws are retracted; the device can effectively clamp the inlaid component during polishing and prevent the hand from being too close to the polishing machine.

Description

Technical Field

[0001] The invention relates to a metal material sample block polishing fixture and an operating method thereof. Background Art

[0002] In the machinery industry, it is often necessary to investigate the properties of metal materials, such as metallographic structure, hardened layer depth, crystal grain size, etc. Generally, metal parts are relatively large, and for the convenience of measurement and polishing, they need to be cut into smaller samples. Although the sample size has become smaller, it is more difficult to grind and polish the surface of the sample, which requires the sample to be inlaid, and then the inlaid parts are grinded and polished after the sample is inlaid. However, in order to make the inlay powder melt better under heat and complete the inlay work, the height and diameter of the inlay are generally small. Especially when polishing on a polishing machine, it is necessary to add water to cool the sample and add abrasive paste to make the sample better polished, but usually the hand and the inlay are slippery, which can easily cause it to fall off during polishing and cause damage to the fingers of the operator.

[0003] Based on the above problems, we designed a metal material sample polishing fixture and its operation method, which can effectively clamp the inlay during grinding and prevent the hand from getting too close to the polishing machine. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a metal material sample polishing fixture and an operating method thereof which can effectively clamp the inlay during grinding and prevent the hand from being too close to the polishing machine.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A metal material sample polishing fixture comprises a main body, a screw is arranged at the bottom axis of the main body, an arc-shaped guide surface is formed by transition between the upper part of the screw and the main body, a nut is mounted on the screw, a plurality of assembly grooves are arranged in an annular manner on the outer wall of the nut, a claw is mounted in the assembly groove, a right-angle groove is processed on the bottom of the claw, a rear contact surface is formed after the arc-shaped transition at the upper end of the claw, when the claw moves upward, the contact surface acts on the arc-shaped guide surface, and as the nut continues to rotate upward, the lower ends of the plurality of claws are retracted.

[0007] Preferably, an index finger groove and a thumb groove are provided at the upper end of the main body; the edges of the index finger groove and the thumb groove are chamfered; when we are grinding, we need to control the main body. If we apply clamping force on the outside of the main body, our hands may touch the grinding wheel. After adopting the above-mentioned index finger groove and thumb groove, firstly, it is easier to apply a fixed torque to the main body. Secondly, the index finger and thumb are respectively located in the index finger groove and the thumb groove, so that the hand is blocked by the main body. Even if an operating error occurs during polishing, the hand can still be prevented from touching the polishing machine.

[0008] Preferably, a knurled portion is machined on the outside of the nut.

[0009] Preferably, a stress-bearing hole is drilled on the outer side of the nut, and the stress-bearing hole is located on the diameter line of the nut; the stress-bearing hole can actively apply a rotational torque to the nut with the help of a tool such as a screwdriver.

[0010] Preferably, a circular groove is processed on the top of the nut, the two ends of the circular groove are closed, the circular groove passes through a plurality of the assembly grooves, an annular rod is assembled in the circular groove, the annular rod fits the circular groove, a first screw is matched between the annular rod and the nut, and the part of the annular rod that fits in the assembly groove is a straight rod part; the claw has a through hole for passing through the straight rod part, and the through hole can rotate along the straight rod part; the assembly clearance between the claw and the assembly groove is less than 0.5mm. The claw will wear or deform after use, resulting in insufficient tight fit between the claw and the inlay, causing the inlay to slip and loosen, affecting polishing, and the claw needs to be replaced at this time. In the traditional technology, a pin is passed through the through hole, and then the two ends of the pin are welded to the groove wall of the assembly groove. The above technical means require sufficient gap for spot welding between the claw and the assembly groove, and the claw must be rotatable, so the claw cannot be welded with the pin, so that the claw can be offset along the pin; the positioning of the claw is inaccurate. The technical means in the present device can effectively avoid this problem. First, the clearance between the claw and the assembly groove is smaller, which prevents the claw from loosening. Second, the claw is sleeved on the annular rod, and the annular rod is detachable, which makes the installation of the above structure unnecessary by welding, and the assembly is more convenient. When the claw is deformed, it is only necessary to remove the annular rod and replace the claw.

[0011] Preferably, a retreat groove is processed on the inner side of the claw, and a gap of 2 mm to 4 mm is formed between the retreat groove and the bottom of the assembly groove.

[0012] Preferably, a threaded hole is processed at the bottom of the screw, and a limit screw is matched through the threaded hole. The function of the above structure is to limit the position. After adopting the above structure, when the screw is screwed down to a certain extent, it will abut against the embedded part and cannot be screwed in further. The purpose is to avoid further tightening of the claw when sufficient fixing force is achieved to avoid excessive deformation of the claw.

[0013] An operating method of a metal material sample polishing fixture comprises the following steps:

[0014] ① First, the sample blocks are inlaid;

[0015] ②Then place the inlay under the screw;

[0016] ③ Keep the nut in a fixed state, and then screw down the screw. After the screw is screwed down, the nut moves up relative to the screw. At this time, the contact surface acts on the arc-shaped guide surface. Under the action of the arc-shaped guide surface, the upper end of the claw rotates and moves away from the screw. Correspondingly, the lower end of the claw retracts inward. At this time, the lower end of the claw clamps and fixes the inlay.

[0017] The beneficial effects of the present invention are:

[0018] 1) This device can be equipped with multiple claws. As the screw is turned downward, multiple claws are tightened at the same time, with uniform tightening force and good centering, which is particularly suitable for clamping circular workpiece inlays;

[0019] 2) The device is small in size and structure, easy to hold, and is particularly suitable for clamping inlaid parts;

[0020] 3) The operation of this device is simpler. You only need to rotate the main body to tighten the claws. The operation is simple and convenient.

[0021] 4) The device uses the main body as a handpiece to protect the hands;

[0022] 5) The device has a simple structure and low cost, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a front view of the present invention;

[0025] Figure 2 A top view of the present invention;

[0026] Figure 3 Schematic diagram of the cooperation between the nut and the annular rod;

[0027] Figure 4 is a top view of the nut;

[0028] Figure 5 It is a structural schematic diagram of the claw;

[0029] Figure 6 It is a folding schematic diagram of the present invention;

[0030] Figure 7 This is a schematic diagram of the installation of the limit screw. DETAILED DESCRIPTION

[0031] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0032] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0033] In the description of the present invention, it is necessary to understand that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, in the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "disposed", "socketed", "connected", "through", "plugged" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figures 1 to 7shown.

[0037] Example 1

[0038] A metal material sample polishing fixture comprises a main body 1, a screw 101 is arranged at the bottom axis of the main body 1, an arc-shaped guide surface 102 is formed by transition between the upper part of the screw 101 and the main body 1, a nut 2 is assembled on the screw 101, a plurality of assembly grooves 201 are arranged in an annular manner on the outer wall of the nut 2, a claw 3 is assembled in the assembly groove 201, a right-angle groove 301 is processed at the bottom of the claw 3, a rear contact surface 302 is formed after the arc-shaped transition at the upper end of the claw 3, when the claw 3 moves upward, the contact surface 302 acts on the arc-shaped guide surface 102, and as the nut 2 continues to rotate upward, the lower ends of the plurality of claws 3 are retracted.

[0039] Example 2

[0040] An index finger groove 111 and a thumb groove 112 are provided at the upper end of the main body 1; the edges of the index finger groove 111 and the thumb groove 112 are chamfered; when we are grinding, we need to control the main body 1. If we apply clamping force on the outside of the main body 1, our hands may touch the grinding wheel. After adopting the above-mentioned index finger groove 111 and thumb groove 112, firstly, it is easier to apply a fixed torque to the main body 1. Secondly, the index finger and thumb are respectively located in the index finger groove 111 and the thumb groove 112, so that the hand is blocked by the main body 1. Even if there is an operational error during the polishing process, the hand can still be prevented from touching the polishing machine.

[0041] Example 3

[0042] A knurled portion 211 is processed on the outside of the nut 2 .

[0043] Example 4

[0044] A force-bearing hole 212 is drilled on the outer side of the nut 2 , and the force-bearing hole 212 is located on the diameter line of the nut 2 ; the force-bearing hole 212 can actively apply a rotational torque to the nut 2 with the help of a tool such as a screwdriver.

[0045] Example 5

[0046] A circular groove 4 is processed on the top of the nut 2, and the two ends of the circular groove 4 are closed. The circular groove 4 passes through a plurality of the assembly grooves 201. A ring rod 5 is installed in the circular groove 4, and the ring rod 5 fits the circular groove 4. A first screw 501 is fitted between the ring rod 5 and the nut 2. The part of the ring rod 5 that fits in the assembly groove 201 is a straight rod part 6; the claw 3 has a through hole 331 for passing through the straight rod part 6, and the through hole 331 can rotate along the straight rod part 6; the assembly clearance between the claw 3 and the assembly groove 201 is less than 0.5mm. The claw 3 will wear or deform after use, resulting in insufficient fit between the claw 3 and the inlay, causing the inlay to slip and loosen, affecting polishing. At this time, the claw 3 needs to be replaced. In the traditional technology, a pin is passed through the through hole 331, and then the two ends of the pin are welded to the groove wall of the assembly groove 201. The above technical means require that there be enough gap for spot welding between the claw 3 and the assembly groove 201, and the claw 3 must be rotatable, so the claw 3 cannot be welded to the pin, so that the claw 3 can be offset along the pin; the positioning of the claw 3 is inaccurate. However, after adopting the technical means in this device, this problem can be effectively avoided. First, the matching gap between the claw 3 and the assembly groove 201 is smaller, which avoids the loosening of the claw 3. Secondly, the claw 3 is sleeved on the annular rod 5, and the annular rod 5 is detachable, which makes the installation of the above structure without welding, and the assembly is more convenient. When the claw 3 is deformed, it is only necessary to remove the annular rod 5 and replace the claw 3.

[0047] Example 6

[0048] A retreat groove 332 is processed on the inner side of the clamping claw 3 , and a gap of 2 mm to 4 mm is formed between the retreat groove 332 and the bottom of the assembly groove 201 .

[0049] Example 7

[0050] A threaded hole is processed at the bottom of the screw 101, and the threaded hole cooperates with the limit screw 7. The function of the above structure is to limit the position. After the above structure is adopted, the screw 101 will abut against the embedded part after being screwed down to a certain extent, and it cannot be screwed in further at this time. The purpose is to avoid further tightening of the claw 3 when sufficient fixing force is reached, and avoid excessive deformation of the claw 3.

[0051] Example 8

[0052] An operating method of a metal material sample polishing fixture comprises the following steps:

[0053] ① First, the sample blocks are inlaid;

[0054] ②Then place the inlay under the screw 101;

[0055] ③ Keep the nut 2 in a fixed state, and then screw down the screw 101. After the screw 101 is screwed down, the nut 2 moves up relative to the screw 101; at this time, the contact surface 302 acts on the arc-shaped guide surface 102. Under the action of the arc-shaped guide surface 102, the upper end of the claw 3 rotates and moves away from the screw 101, and correspondingly, the lower end of the claw 3 retracts inward; at this time, the lower end of the claw 3 clamps and fixes the inlay.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A metal material sample polishing fixture, characterized in that: The invention comprises a main body (1), a screw (101) is arranged at the bottom axis of the main body (1), an arc-shaped guide surface (102) is formed between the upper part of the screw (101) and the main body (1), a nut (2) is assembled on the screw (101), a plurality of assembly grooves (201) are arranged in an annular manner on the outer wall of the nut (2), a clamping claw (3) is assembled in the assembly groove (201), a right-angle clamping groove (301) is processed at the bottom of the clamping claw (3), a rear contact surface (302) is formed after the arc-shaped transition at the upper end of the clamping claw (3), when the clamping claw (3) moves upward, the contact surface (302) acts on the arc-shaped guide surface (102), and as the nut (2) continues to rotate upward, the lower ends of the plurality of clamping claws (3) are retracted; Wherein, an index finger groove (111) and a thumb groove (112) are provided at the upper end of the main body (1); the edges of the index finger groove (111) and the thumb groove (112) are both chamfered; A circular groove (4) is machined on the top of the nut (2), the two ends of the circular groove (4) are closed, the circular groove (4) passes through a plurality of the assembly grooves (201), an annular rod (5) is mounted in the circular groove (4), the annular rod (5) fits in the circular groove (4), a first screw (501) is provided between the annular rod (5) and the nut (2), the part of the annular rod (5) fitted in the assembly groove (201) is a straight rod part (6); the claw (3) has a through hole (331) for passing through the straight rod part (6), the through hole (331) can rotate along the straight rod part (6); the assembly clearance between the claw (3) and the assembly groove (201) is less than 0.5 mm.

2. The metal material sample polishing fixture according to claim 1, characterized in that: A knurled portion (211) is machined on the outside of the nut (2).

3. The metal material sample polishing fixture according to claim 2, characterized in that: A force-bearing hole (212) is drilled on the outer side of the nut (2), and the force-bearing hole (212) is located on the diameter line of the nut (2).

4. The metal material sample polishing fixture according to claim 1, characterized in that: A retreat groove (332) is machined on the inner side of the claw (3), and a gap of 2 mm to 4 mm is formed between the retreat groove (332) and the bottom of the assembly groove (201).

5. The metal material sample polishing fixture according to claim 1, characterized in that: A threaded hole is processed at the bottom of the screw (101), and a limit screw (7) is engaged through the threaded hole.

6. A method for operating the metal material sample polishing fixture according to any one of claims 1 to 5, characterized in that: The following steps are involved: First, the sample blocks are mosaicked; Then place the inlay under the screw (101); The nut (2) is kept in a fixed state, and then the screw (101) is screwed down. After the screw (101) is screwed down, the position of the nut (2) moves upward relative to the screw (101); at this time, the contact surface (302) acts on the arc-shaped guide surface (102). Under the action of the arc-shaped guide surface (102), the upper end of the claw (3) rotates and moves in a direction away from the screw (101), and correspondingly, the lower end of the claw (3) retracts inward; at this time, the lower end of the claw (3) clamps and fixes the inlay.

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