End face grinding and polishing clamp for small compression or impact sample
By designing a small compression or impact sample end surface grinding and polishing fixture, the existing technology problems of low grinding and polishing efficiency of small samples and sample damage are solved, an efficient and precise grinding and polishing process is achieved, and costs and waste are reduced.
Patent Information
- Application Number
- CN202421137074.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The prior art is difficult to efficiently process and test small refractory alloy samples, especially in compression and impact mechanical properties testing. Manual grinding and polishing technology requires high requirements and low efficiency, which can easily lead to sample damage and inlay waste.
A small end-face grinding and polishing fixture for compression or impact specimens is designed. The specimen is mounted in a specimen slot and can be hand-held or combined with an automatic grinding machine to achieve automatic grinding and polishing, which improves the grinding and polishing efficiency and improves the efficiency of grinding and polishing. Sample damage is reduced.
It improves the accuracy and efficiency of end-face grinding and polishing of compression or impact specimens, reduces labor costs and waste of insert materials, and avoids arc-shaped grinding and polishing of samples and injuries to the operator's hands.
Smart Images
Figure CN222371335U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of end surface grinding and polishing of compression or impact specimens, and in particular relates to a small end surface grinding and polishing fixture of compression or impact specimens. Background Art
[0002] Due to the poor formability of refractory alloys, it is difficult to process thin and large plates for tensile performance testing, especially for button ingots prepared in the laboratory using a small vacuum arc furnace. The main mechanical property testing methods are compression and impact testing. When conducting compression and impact mechanical property tests in the laboratory, such as quasi-static compression and Hopkinson bar tests, the two ends of the cylindrical sample need to be ground and polished so that the sample can be subjected to vertical force and the accuracy of the experimental data is guaranteed. However, the compression or impact specimens prepared in the laboratory are small in size, especially the Hopkinson bar test specimens, whose height is only about 3mm or less. Small-sized specimens place high demands on sample preparation. Manual grinding and polishing requires high grinding and polishing skills from the experimental operator. When the force is unevenly applied, it is easy to grind the two end faces into an arc shape, and the loss of the sample is also large.
[0003] Especially for small-sized samples, it is too small to be held by fingers, and it is easy to damage the operator's hands when the grinding and polishing time is long. If multiple samples are mounted together and polished simultaneously, the efficiency can be improved, but it is difficult to ensure that each sample can be placed vertically, and the mounting material needs to be physically destroyed to remove the sample, which will inevitably damage the sample and waste the mounting material.
[0004] Therefore, it is very important to improve the accuracy and efficiency of grinding and polishing the end face of a compression or impact specimen while ensuring safety, and it is necessary to provide a small end face grinding and polishing fixture for a compression or impact specimen. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide a small end face grinding and polishing fixture for compression or impact specimens in view of the deficiencies of the above-mentioned prior art. The end face grinding and polishing fixture clamps the compression or impact specimens by setting a specimen slot, thereby realizing end face grinding and polishing of multiple compression or impact specimens at the same time, and can be hand-held or bonded to a cylindrical inlay material adapted to an automatic sample grinding machine to realize automatic grinding and polishing. When the grinding and polishing of one end face of the compression or impact specimen is completed, the same steps of grinding and polishing are performed on the other end face, thereby improving the grinding and polishing efficiency, and no operations such as inlaying are required, reducing steps and saving inlay materials, improving work efficiency, and reducing labor costs.
[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a small end face grinding and polishing fixture for compression or impact specimens, characterized in that the grinding and polishing fixture includes a main body, a specimen slot for clamping the compression or impact specimen is provided on the main body, and a locking assembly is also provided on the main body for clamping the compression or impact specimen.
[0007] The above-mentioned end face grinding and polishing fixture for a small compression or impact specimen is characterized in that the main body is an integrated main body, a V-shaped notch is provided at the top of the integrated main body, and an integrated specimen groove connected to the V-shaped notch is provided in the middle of the integrated main body.
[0008] The above-mentioned end surface grinding and polishing fixture for a small compression or impact specimen is characterized in that the integrated specimen slot includes a plurality of circular through holes arranged from small to large in diameter.
[0009] The above-mentioned end face grinding and polishing fixture for a small compression or impact specimen is characterized in that the width of the middle portion of the one-piece body is smaller than the width at both ends, and a reserved hole communicating with the one-piece specimen slot is also provided on the one-piece body.
[0010] The above-mentioned end face grinding and polishing fixture for small compression or impact specimens is characterized in that the one-piece body is provided with a V-shaped notch and one end is penetrated by an inner hole for matching a locking assembly, and the locking assembly includes a screw passing through the inner hole and a nut matching the screw.
[0011] The above-mentioned end face grinding and polishing fixture for a small compression or impact specimen is characterized in that the main body is composed of two split main bodies with the same structure, and a front notch, a split specimen groove and a rear notch are sequentially arranged on one side of the split main body.
[0012] The above-mentioned end surface grinding and polishing fixture for a small compression or impact specimen is characterized in that the split specimen slot includes a plurality of semicircular through holes with the same diameter.
[0013] The above-mentioned end face grinding and polishing fixture for a small compression or impact specimen is characterized in that two inner holes for matching two locking components are respectively opened at both ends of the split body, and the locking components include bolts that pass through the two split bodies in sequence and nuts that match the bolts.
[0014] Compared with the prior art, the utility model has the following advantages:
[0015] 1. The utility model provides a sample slot to clamp the compression or impact sample, thereby realizing end face grinding and polishing of multiple compression or impact samples at the same time, with a high tolerance for size processing of the compression or impact sample, and can be hand-held or bonded to a cylindrical inlay adapted to an automatic sample grinder to realize automatic grinding and polishing. After the grinding and polishing of one end face of the compression or impact sample is completed, the compression or impact sample is fine-tuned, and the fixture is turned over to perform the same grinding and polishing steps on the other end face, thereby improving the grinding and polishing efficiency, and eliminating the need for operations such as inlaying, reducing steps and saving inlays, improving work efficiency, and reducing labor costs.
[0016] 2. The fixture of the utility model has a simple structure and is easy to process. It can be adjusted according to the actual situation of the sample and can be used repeatedly.
[0017] 3. When the end face grinding and polishing fixture of the utility model is used for end face grinding and polishing of a compression or impact sample, the sample is placed vertically in the sample slot, and the clamping force of the fixture is adjusted to make the sample completely vertical to the horizontal plane. In this case, the sample is ground and polished by holding a fixture whose surface area is much larger than the end face surface of the sample. The force distributed on the entire surface of the fixture is relatively uniform, and horizontal grinding and polishing of the end face of the sample can be achieved, avoiding uneven end faces such as arcs caused by uneven force during the grinding and polishing of the sample by simply holding the sample.
[0018] 4. The utility model is aimed at smaller Hopkinson specimens and compression or impact specimens, avoiding damage to the operator's hands. At the same time, the fixture can realize the synchronous grinding and polishing of multiple samples, greatly improving the grinding and polishing efficiency, and does not require operations such as inlaying, reducing steps and saving inlay materials. In summary, the compression or impact specimen end face grinding and polishing fixture of the utility model is simple to operate, easy to process and use.
[0019] The technical solution of the utility model is further described in detail below through the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the end surface grinding and polishing fixture of the utility model whose main body is an integrated main body.
[0021] Figure 2 The utility model is a schematic diagram of the structure of an end face grinding and polishing fixture in which the main body is composed of two split main bodies with the same structure.
[0022] Description of reference numerals:
[0023] 1—One-piece body; 2—V-shaped notch; 3—One-piece sample slot;
[0024] 4—reserved hole; 5—screw; 6—nut;
[0025] 7—Split main body; 8—Front notch; 9—Split sample slot;
[0026] 10—rear notch; 11—bolt; 12—nut. DETAILED DESCRIPTION
[0027] The utility model discloses a small end surface grinding and polishing fixture for a compression or impact sample, comprising a main body, a sample slot for clamping the compression or impact sample is provided on the main body, and a locking component for matching the main body to clamp the compression or impact sample is also provided on the main body.
[0028] It should be noted that the sample slot is arranged along the central axis of the main body to clamp the compression or impact sample, so as to realize the end face grinding and polishing of multiple compression or impact samples at the same time. The tolerance rate for the size processing of the compression or impact sample is high, and it can be selected to be handheld or bonded with a cylindrical inlay that is compatible with the automatic sample grinder to realize automatic grinding and polishing. When one of the end faces of the compression or impact sample is ground and polished, the compression or impact sample is fine-tuned, and the fixture is turned over, and the same steps of grinding and polishing are performed on the other end face, which improves the grinding and polishing efficiency, and does not require operations such as inlaying, reduces steps and saves inlays, and the compression or impact sample in the sample slot is locked by using a locking assembly to ensure that the main body is tightly clamped with the compression or impact sample.
[0029] It should be noted that the sample groove is processed according to the number and size of the compression or impact samples.
[0030] It should be noted that the thickness of the main body is selected based on the height of the commonly used compression or impact specimens and the comfort of holding, and is generally close to or slightly lower than the height of the compression or impact specimens.
[0031] It should be noted that the material of the main body is selected according to the hardness of the compression or impact specimen, and generally a stainless steel material with a higher hardness is selected.
[0032] Example 1
[0033] In this embodiment, the main body is an integrated main body 1 .
[0034] like Figure 1 As shown, in this embodiment, the main body is an integrated main body 1, a V-shaped notch 2 is provided at the top of the integrated main body 1, and an integrated sample groove 3 connected to the V-shaped notch 2 is provided in the middle of the integrated main body 1. The V-shaped notch 2 is provided to facilitate the compression or impact sample to be loaded into the integrated sample groove 3, and the V-shaped notch 2 is connected to the integrated sample groove 3, so that the V-shaped notch 2 is opened to open the integrated sample groove 3 to load the compression or impact sample.
[0035] like Figure 1As shown, in this embodiment, the integrated sample slot 3 includes a plurality of circular through holes arranged from small to large in diameter. The plurality of circular through holes arranged from small to large in diameter can be used to clamp a plurality of compression or impact samples of different sizes at one time, and can be ground and polished simultaneously.
[0036] like Figure 1 As shown, in this embodiment, the width of the middle part of the one-piece body 1 is smaller than the width of the two ends, and a reserved hole 4 connected to the one-piece sample slot 3 is also provided on the one-piece body 1. By providing a long strip of reserved holes 4 along the central axis of the one-piece body 1 and connecting to the one-piece sample slot 3, it is convenient to adjust the shape and size of the one-piece sample slot 3 in the one-piece body 1, to facilitate the placement of the compression or impact sample, and to facilitate the compression and deformation of the two ends of the one-piece body 1 when the locking assembly is locked, so as to tighten the clamped compression or impact sample.
[0037] like Figure 1 As shown, in this embodiment, the one-piece body 1 has a V-shaped notch 2 at one end and is penetrated by an inner hole for matching a locking assembly, and the locking assembly includes a screw 5 inserted in the inner hole and a nut 6 matched with the screw 5. The inner hole is provided to facilitate the insertion of the screw 5, and the nut 6 is provided to compress and deform both ends of the one-piece body 1 when tightened, so that the clamped compression or impact specimen is tightened, and the clamping force of the one-piece body 1 on the compression or impact specimen is adjusted.
[0038] like Figure 1 As shown, in actual use, the material of the integrated body 1 is stainless steel, the thickness of the integrated body 1 is 5mm, the longest width is 30mm, and the length is 35mm. A V-shaped notch 2 is set on the upper end surface, the length of the V-shaped notch 2 is 10mm, and the widest width of the V-shaped notch 2 is 6mm; the integrated body 1 is processed with an integrated sample groove 3 along the central axis part, and the integrated sample groove 3 is composed of 3 circular through holes with different diameters arranged in sequence, and the diameters of the circular through holes are 3.8mm, 4mm and 4.2mm respectively, and the circular through holes are arranged downward from the lower end of the V-shaped notch 2 from small to large in diameter; the middle part of the integrated body 1 is processed into a width of 18mm and a length of 20mm, and the reserved hole 4 is processed into a square hole with a length of 8mm and a width of 2mm; the inner hole diameter of the top of the integrated body 1 is 2mm, and the inner hole runs through the entire integrated body 1, and a screw 5 with a diameter slightly smaller than 2mm and a length greater than 30mm is selected to pass through the inner hole, and a nut 12 is used to fix it at the other end;
[0039] In this embodiment, TaW12 alloy and HfNbTaTiZr refractory high entropy alloy compression specimens with a size of 4mm×7mm diameter×height are selected for end face grinding and polishing. Due to the deviation of the reserved amount of wire cutting processing and the corrosion of the side, the diameter of the compression specimen deviates slightly from 4mm. According to the actual situation of the compression specimen, the compression specimen is vertically placed in the integrated specimen slot 3 of the integrated body 1, and the lower end of the compression specimen is slightly higher by about 0.5mm. The compression specimen is clamped with a nut 12 so that the compression specimen cannot move up and down in the vertical direction. Then, the integrated body 1 together with the clamped compression specimen is placed on sandpaper. The operator holds the integrated body 1 and grinds and polishes one end face of the compression specimen with sandpaper. The grits of the sandpaper are selected as 220#, 400#, 800#, 1000#, 2000# and 3000# respectively. After the grinding and polishing is completed, the integrated body 1 is rotated, and the height of the compression specimen is adjusted. The other end face of the compression specimen is ground and polished using the same method.
[0040] Example 2
[0041] In this embodiment, the main body is composed of two split main bodies 7 with the same structure.
[0042] like Figure 2 As shown, in this embodiment, the main body is composed of two split main bodies 7 of the same structure, and one side of the split main body 7 is sequentially provided with a front notch 8, a split sample slot 9 and a rear notch 10. The compression or impact sample clamping is achieved by splicing two split main bodies 7 of the same structure.
[0043] like Figure 2 As shown, in this embodiment, the split sample slot 9 includes a plurality of semicircular through holes with the same diameter. By providing a plurality of semicircular through holes with the same diameter, a plurality of compression or impact samples with the same diameter can be clamped, thereby realizing simultaneous grinding and polishing of a plurality of compression or impact samples with the same diameter.
[0044] like Figure 2 As shown, in this embodiment, two inner holes for matching two locking components are respectively opened at both ends of the split body 7, and the locking components include bolts 11 that pass through the two split bodies 7 in sequence and nuts 12 that match the bolts 11. The two split bodies 7 are assembled by the two bolts 11, and the two split bodies 7 are brought close by tightening the nuts 12, so as to tighten the clamped compression or impact specimens, and adjust the clamping strength of the two split bodies 7 on the compression or impact specimens.
[0045] like Figure 2As shown, in actual use, in order to facilitate hand-holding, the split body 7 has a thickness of 3mm, a width of 20mm, a length of 30mm, and a quantity of two. Both ends of one side of the split body 7 are processed with a front notch 8 and a rear notch 10 with a length of 6mm, and 6 semicircular through holes with a diameter of 2.8mm are processed, and both ends of the split body 7 are processed with an inner hole with an inner diameter of 2mm. Bolts 11 with a diameter less than 2mm are selected to pass through the inner holes of the two split bodies 7 in sequence, and are fixed with matching nuts 12;
[0046] In this embodiment, the end surface of the TaW12 alloy and HfNbTaTiZr refractory high entropy alloy Hopkinson impact specimens with a size of 3mm×3mm diameter×height is selected for end surface grinding and polishing. First, two bolts 11 are used to splice the two split main bodies 7, and the nuts 12 are tightened to make the two split main bodies 7 close to each other, leaving a distance of about 3.5mm. The impact specimen is placed vertically, the nuts 12 are tightened, and the height of the impact specimen is fine-tuned so that the impact specimen is about 0.5mm away from the fixture plane. Then, the two split main bodies 7 together with the clamped impact specimens are placed on sandpaper. The operator holds the two split main bodies 7 and grinds and polishes one end surface of the impact specimen. The grits of the sandpaper are selected as 220#, 400#, 800#, 1000#, 2000# and 3000# respectively. After the grinding and polishing is completed, the two split main bodies 7 are rotated, and the height of the impact specimen is adjusted. The same method is used to grind and polish the other end surface of the impact specimen.
[0047] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the utility model still falls within the protection scope of the technical solution of the utility model.
Claims
1. A small compression or impact specimen end surface grinding and polishing fixture, characterized in that: The grinding and polishing fixture comprises a main body, on which a sample slot for clamping a compression or impact sample is provided, and on which a locking assembly for cooperating with the main body to clamp the compression or impact sample is also provided.
2. The end surface grinding and polishing fixture for a small compression or impact specimen according to claim 1, characterized in that: The main body is an integrated main body (1), a V-shaped notch (2) is provided at the top of the integrated main body (1), and an integrated sample groove (3) connected to the V-shaped notch (2) is provided in the middle of the integrated main body (1).
3. The end surface grinding and polishing fixture for a small compression or impact specimen according to claim 2, characterized in that: The integrated sample slot (3) comprises a plurality of circular through holes arranged from small to large in diameter.
4. The end surface grinding and polishing fixture for a small compression or impact specimen according to claim 2, characterized in that: The width of the middle portion of the integrated body (1) is smaller than the width of the two ends, and a reserved hole (4) communicating with the integrated sample slot (3) is also provided on the integrated body (1).
5. The end surface grinding and polishing fixture for a small compression or impact specimen according to claim 2, characterized in that: The one-piece body (1) is provided with a V-shaped notch (2) and one end of the body is penetrated by an inner hole for matching a locking assembly. The locking assembly comprises a screw (5) passing through the inner hole and a nut (6) matching the screw (5).
6. The end surface grinding and polishing fixture for a small compression or impact specimen according to claim 1, characterized in that: The main body is formed by assembling two split main bodies (7) of the same structure, and one side of the split main body (7) is provided with a front notch (8), a split sample slot (9) and a rear notch (10) in sequence.
7. The end surface grinding and polishing fixture for a small compression or impact specimen according to claim 6, characterized in that: The split sample slot (9) comprises a plurality of semicircular through holes with the same diameter.
8. The end surface grinding and polishing fixture for a small compression or impact specimen according to claim 6, characterized in that: Two inner holes for matching two locking components are respectively formed at the two ends of the split body (7), and the locking components include bolts (11) passing through the two split bodies (7) in sequence and nuts (12) matching the bolts (11).