Clamp suitable for blade flank scratch and nanoindentation testing

Abstract

The utility model provides a kind of clamp suitable for blade relief scratch and nano indentation test, including fixed module and clamping module being connected with each other;One side of the clamping module is opened with the positioning recess for accommodating blade, and positioning recess is recessed from the surface of side to the inside of clamping module, and positioning recess extends from side to top surface;When blade is placed in positioning recess, the relief of blade faces upwards.Relative to prior art, the utility model can be suitable for the blade of complex geometry;There is no rigid clamping, solve the technical problem that the rigid clamping mode of prior art to blade can cause local excessive stress and thereby interfere with test result.Further, the adjustment angle of clamping module is equal to the angle of relief angle, design is ingenious, can ensure the accuracy of adjustment angle, improve the accuracy of test.The whole clamp is simple and intuitive, even non-professional personnel can quickly get started, reduce the operation difficulty and training cost.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and more specifically, to a fixture suitable for testing the back face scratches and nano-indentations of cutting blades. Background Technology

[0002] CNC cutting inserts, as the "precision teeth" of industrial manufacturing, efficiently cut various materials in fields such as automotive, aerospace, mold making, energy, and medical. With micron-level precision, intelligent control, and diverse coating technologies, they enable automated machining of complex parts, driving the continuous evolution of the manufacturing industry towards high precision, high efficiency, and intelligence. They are a core technology carrier connecting traditional manufacturing and intelligent manufacturing. The performance of the surface coating of CNC cutting inserts (such as adhesion, hardness, and wear resistance) directly affects the tool's service life and machining quality. Hard coatings deposited through processes such as PVD and CVD can significantly improve the hardness, wear resistance, high-temperature resistance, and anti-adhesion ability of the inserts, effectively suppressing the accumulation of cutting heat and tool wear.

[0003] The testing of tool coatings is of great significance for tool performance and the development of new coatings. Currently, scratch testing (to assess coating adhesion) and nanoindentation testing (to measure coating hardness and elastic modulus) are important methods for evaluating coating performance. Currently, samples for both scratch and nanoindentation tests are directly clamped in the vise of the testing equipment, such as... Figure 1 and Figure 2 As shown, this requires the sample to have two parallel surfaces. However, due to the design of the back angle of the CNC insert, its surface often cannot simultaneously meet the sample clamping requirements of scratch testing and nano-indentation testing, resulting in low testing efficiency and easy damage to the insert during the testing process, which increases the testing cost.

[0004] Application number 201821726164.2, entitled "Utility Model Patent for a Test Device for the Wear Resistance of Finished Tool Coatings," discloses an angle-adjustable clamp, including a fixed plate and a movable block. The movable block has a circular through-hole and an arc-shaped through-hole on its side for connection with the fixed plate, and a rectangular groove and a fixing threaded hole on its front for clamping / fixing the tool under test. This technical solution considers that the sample to be tested needs to have two parallel surfaces during wear resistance testing; therefore, the movable block can rotate relative to the fixed block to adjust the angle of the tool placed on the movable block, facilitating the wear resistance testing of the coating. However, this solution features a rectangular groove on the movable block. Such a clamp, designed for planar samples, is difficult to adapt to the complex geometry of CNC cutting tools (different back angles, arc-shaped cutting edges, chip breakers, etc.). For example, clamping a cutting tool with a back angle can easily lead to displacement or vibration during testing. Furthermore, the upper wall of the rectangular groove has a fixing threaded hole. The tool under test is placed in the rectangular groove and fixed through the fixing threaded hole. Such rigid clamping may cause excessive local stress, thus interfering with the test results. Although the movable block can be adjusted in angle, it still needs to be repeatedly adjusted to a suitable angle before testing, resulting in low testing efficiency and accuracy. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing fixtures for testing blade scratches and nano-indentations are not suitable for tools with complex geometries such as back angles, the rigid clamping method of the fixture may cause excessive local stress and thus interfere with the test results, and the adjustment of the movable block has low testing efficiency and accuracy. The present invention provides a fixture that can solve the above technical problems and is suitable for testing blade back face scratches and nano-indentations.

[0006] A fixture suitable for testing the flank scratch and nano-indentation of a cutting blade includes a fixing module and a clamping module connected to each other. A positioning groove for accommodating the cutting blade is formed on one side of the clamping module. The positioning groove is recessed from the surface of the side of the clamping module toward the inside of the clamping module, and the depth of the recess is matched to the thickness of the cutting blade. The positioning groove extends from the side to the top surface, so that when the cutting blade is placed in the positioning groove, one flank of the cutting blade protrudes upwards from the top surface of the clamping module. Fasteners are used to fix the cutting blade to the clamping module through the positioning hole of the cutting blade.

[0007] In this invention, the side and top surfaces of the movable module refer to the top surface of the clamping module when the fixture is installed on the indentation and scratch testing equipment, and the two sides of the top surface are the side surfaces. "Upward" in "the back face of the blade faces upward" refers to the direction of the top surface. The blade itself has positioning holes for fixing the blade to the handle. In this invention, fasteners are used to fix the blade to the clamping module using these positioning holes.

[0008] The distance between the upper and lower surfaces of the blade is generally referred to as the blade thickness. The depth of the locating groove recessed into the clamping module to match the blade thickness means that the depth of the locating groove is greater than, equal to, or less than the blade thickness. One flank face of the blade protruding from the top surface of the clamping module means that one flank face of the blade protrudes from the top surface of the clamping module, is parallel to the top surface of the clamping module, or is lower than the top surface.

[0009] The positioning groove is used to accommodate and position the blade. The positioning groove is a groove on the side. When installing the blade, it is simply placed in the positioning groove and then fastened with a fastener through the positioning hole of the blade. The blade is not subjected to rigid clamping force. It should be noted that in this invention, the blade is placed in the positioning groove, unlike the prior art patent which clamps it in a rectangular groove. This invention processes the positioning groove on the side of the movable block according to the shape of the blade, which is convenient to process. The shape of the positioning groove matches the shape of the blade, making it suitable for blades with complex geometries. There is no rigid clamping, solving the technical problem that the rigid clamping method of the prior art may cause excessive local force, thus interfering with test results. The blade is only fixed by fasteners, enabling quick installation and replacement. When the blade is placed in the positioning groove, the back face of the blade faces upwards.

[0010] When the blade is a back-angle blade, and scratch and nano-indentation tests are required on the back face of the blade, the blade is placed directly in the positioning groove, and the back face cannot be parallel to the horizontal plane. Therefore, this utility model further incorporates the following design.

[0011] Furthermore, the blade is a back-angle blade, and the clamping module is connected to the fixing module via a rotary joint; when the blade is placed in the positioning groove, the back face of the blade faces upward. By rotating the clamping module, the back face of the blade is made parallel to the horizontal plane, which facilitates testing. The horizontal plane is the mounting plane of the fixing module.

[0012] Furthermore, angle scale lines are provided on the mounting surfaces of the fixing module and the clamping module, and the angle scale lines are located below the clamping module. When rotating the clamping module, the angle of rotation of the clamping module can be determined by the angle scale lines.

[0013] Furthermore, when the clamping module is in a horizontal position, corresponding to 0 degrees on the angle scale, the angle between the back face of the blade and the horizontal plane is equal to the back angle of the blade. After the blade is installed, rotating the clamping module by the back angle allows for quick and intuitive adjustment. The horizontal position of the clamping module refers to its position when it is not rotating.

[0014] The clamping module can rotate relative to the fixed module. This structure allows the clamp to be used with blades of different back angles. When the blade is installed in the positioning groove, the blade thickness can be less than, equal to, or greater than the depth of the positioning groove. The clamp can be used with blades of the same shape but different back angles. When the shapes and back angles are different, the clamping module can be replaced. The clamping module and the fixed module can be connected by fasteners, allowing for quick replacement.

[0015] The clamping module's adjustment angle is equal to the rear angle, a clever design that ensures precise angle adjustment and improves testing accuracy. The entire fixture is simple and intuitive to operate, allowing even non-professionals to quickly learn how to use it, reducing operational difficulty and training costs.

[0016] Furthermore, both the fixing module and the clamping module are cubic. The bottom surfaces of the fixing module and the clamping module are parallel to the fixture mounting plane, which is a horizontal plane.

[0017] Furthermore, the rotary joint is a threaded joint, including a threaded hole passing through the fixing module and the clamping module, and a screw that mates with the threaded hole. After adjusting the clamping module to a suitable angle, tighten the screw to fix the clamping module and the fixing module.

[0018] Furthermore, the screw extends from the movable module, and a knob is fixed to the end of the extended portion of the screw to facilitate turning the screw.

[0019] Furthermore, the clamping module is made of high-strength aluminum alloy or steel to ensure clamping rigidity and long-term stability.

[0020] Furthermore, the fixing module and the clamping module are an integrated structure, and the blade is a back-angle blade. When the blade is placed in the positioning groove, the back face of the blade faces upward and is parallel to the horizontal plane. Another design of this utility model allows for the fixing module and the clamping module to be integrated. The positioning groove is designed to ensure that when the blade is placed in the positioning groove, the back face of the back-angle blade faces upward and is parallel to the horizontal plane. This integrated structure is only suitable for blades with the same back-angle angle.

[0021] Furthermore, the maximum size of the fixture is 30×30×30mm.

[0022] This utility model has the following beneficial effects: 1. A positioning groove is formed on the side of the clamping module. The shape of the positioning groove is designed according to the shape of the blade. When placing the blade, simply place the blade directly into the positioning groove and use fasteners passing through the blade positioning holes to fix the blade to the clamping module. Compared with the prior art, the fixture can be used for tools with complex geometries such as back angles, and since the blade is not clamped in the positioning groove, the blade will not be subjected to excessive local stress due to rigid clamping, thus avoiding interference with the test results.

[0023] 2. The clamping module is connected to the fixed module via a rotary joint. When the blade is a back angle blade, it is necessary to adjust the back face of the back angle blade to be parallel to the horizontal plane. Rotating the clamping module allows for quick and convenient adjustment. Furthermore, an angle scale line is set on the fixed module, and when the clamping module is in a horizontal position, it corresponds to 0 degrees on the angle scale line. The angle between the back face of the blade and the horizontal plane of the clamping module is equal to the back angle of the blade. This ingenious design ensures the accuracy of angle adjustment and improves the accuracy of testing by simply rotating the clamping module to the back angle angle when adjusting the angle. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 A schematic diagram (I) of the blade mounting on the clamping device of the testing equipment when performing blade scratch and nanoindentation tests for existing technologies. Figure 2 Schematic diagram (II) of the structure of the blade mounting device in the testing equipment clamping device when performing blade scratch and nanoindentation tests for existing technology. Figure 3 This is a schematic diagram of the fixture structure for testing the flank scratches and nano-indentations of the cutting tool as described in Example 2; Figure 4 This is a schematic diagram of the fixture structure for testing the flank scratches and nano-indentations of the cutting tool as described in Example 3; Figure 5 This is a schematic diagram of the fixture for testing blade back face scratches and nano-indentation, as described in Example 3, mounted on the clamping device of the testing equipment.

[0025] The serial numbers are: 1-clamping device for testing equipment, 2-diamond scribing needle, 3-blade, 4-fixing module, 5-clamping module, 5a-top surface, 5b-side surface, 6-positioning groove, 7-angle dial, 8-angle scale line, 9-knob, 10-integrated structure of fixing module and clamping module, 11-fastener. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0027] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Example 1 A fixture suitable for testing the flank scratch and nano-indentation of a cutting blade includes a fixing module 4 and a clamping module 5 connected to each other. A positioning groove 6 for accommodating a cutting blade 3 is formed on one side 5b of the clamping module 5. The positioning groove 6 is recessed from the surface of the side 5b of the clamping module into the clamping module 5, and the depth of the positioning groove 6 inward into the clamping module 5 matches the thickness of the cutting blade. The positioning groove 6 extends from the side 5b to the top surface 5a so that when the cutting blade 3 is placed in the positioning groove 6, one flank of the cutting blade 3 is exposed from the top surface of the clamping module 5 with its flank facing upward. A fastener 11 is used to fix the cutting blade 3 to the clamping module 5 through the positioning hole of the cutting blade 3.

[0030] This embodiment is applicable to blades without a back angle. When performing scratch and nano-indentation tests on the back face, the blade 3 is placed in the positioning groove 6 with the back face facing upwards and parallel to the horizontal plane. Fasteners 11 are used to pass through the positioning holes of the blade 3 to fix the blade 3 to the clamping module 5. After installing the blade 3 in the fixture, the fixture is then clamped onto the vise of the testing equipment for testing. In this embodiment, a positioning groove 6 is provided on the side 5b of the clamping module 5. The shape of the positioning groove 6 is designed according to the shape of the blade 3. When placing the blade 3, it is directly placed in the positioning groove 6, and fasteners 11 are used to pass through the positioning holes of the blade 3 to fix the blade 3 to the clamping module 5. Compared with the prior art, this fixture is suitable for tools with complex geometries, and since the blade is not clamped in the positioning groove 6, the blade will not be subjected to excessive local force due to rigid clamping, thus avoiding interference with the test results.

[0031] Example 2 A fixture suitable for scratch and nano-indentation testing of the flank face of an insert, wherein the insert 3 is a back-angle insert, and the fixture is used to perform scratch and nano-indentation testing on the flank face of the insert 3; the fixture includes a fixing module 4 and a clamping module 5 connected to each other; as shown Figure 3 As shown, both the fixing module 4 and the clamping module 5 are cubic. The fixing module 4 is used on one hand to fix itself to the clamping device of the scratch instrument or nanoindentation instrument, and on the other hand to install the clamping module 5. Figure 3 As shown, the clamping module 5 is mounted on the fixed module 4. The volume of the clamping module 5 is smaller than that of the fixed module 4, and the top surface 5a of the clamping module 5 extends out of the fixed module 4. The clamping module 5 is made of high-strength aluminum alloy or steel to ensure clamping rigidity and long-term stability.

[0032] The clamping module 5 has a positioning groove 6 on one side 5b for accommodating the blade 3. The positioning groove 6 is recessed from the surface of the side 5b toward the inside of the clamping module 5, and the depth of the recess in the positioning groove 6 matches the thickness of the blade 3. Furthermore, the positioning groove 6 extends from the side 5b to the top surface 5a, so that when the blade is placed in the positioning groove 6, one rear cutting face of the blade 3 protrudes from the top surface of the clamping module 5 with its back face upwards. Figure 3 As shown, in this embodiment, when the blade 3 is placed in the positioning groove 6, the rear cutting surface of the blade 3 faces upward and protrudes from the top surface 5a of the clamping module 5; the blade 3 is fixed to the clamping module 5 by using fasteners 11 passing through the positioning hole of the blade 3.

[0033] like Figure 3The diagram shows the fixture mounted on the testing equipment. The fixing module 4 and the clamping module 5 are arranged in parallel. The upper surface of the cube is the top surface. The top surface of the fixing module 4 is parallel to the top surface 5a of the clamping module 5, and the bottom surface of the fixing module 4 is parallel to the bottom surface of the clamping module 5. The bottom surface of the fixing module 4 is connected to the vise of the testing equipment. The bottom surface of the fixing module 4 and the mounting surface of the testing equipment are horizontal planes.

[0034] The clamping module 5 is connected to the fixing module 4 via a rotary joint; for example... Figure 3 As shown, an angle scale 7 is provided on the mounting surface of the fixing module 4 and the clamping module 5. The angle scale 7 has angle scale lines 8 and is located below the clamping module 5.

[0035] When the clamping module 5 is in a horizontal position, corresponding to 0 degrees on the angle scale line 8, the angle between the back face of the blade 3 and the horizontal plane is equal to the back angle of the blade 3. The rotation angle of the clamping module 5 is equal to the back angle of the blade 3. When the clamping module 5 rotates to the back angle, the back face is parallel to the horizontal plane of the fixture.

[0036] The rotary joint is a threaded joint, including a threaded hole passing through the fixed module 4 and the clamping module 5, and a screw that mates with the threaded hole. The screw extends from the movable module, and a knob 9 is fixed to the end of the extended portion of the screw.

[0037] The difference between Example 2 and Example 1 is that the fixture described in Example 2 is suitable for the back angle blade 3, and the clamping module 5 can rotate relative to the fixed module 4 to adjust the back face of the blade 3 to be parallel to the horizontal plane, which facilitates the testing of scratches and nano-indentations. Furthermore, ingeniously, the adjustment angle of the clamping module 5 is equal to the back angle of the blade 3, allowing for intuitive and precise adjustment, ensuring the accuracy of the angle and the accuracy of the test.

[0038] The procedure is as follows: Place the blade 3 in the positioning groove 6 with the back face facing upwards. Use the fastener 11 to pass through the positioning hole of the blade 3 to fix the blade 3 to the clamping module 5. Rotate the clamping module 5 so that the rotation angle is equal to the back angle, and then tighten the screw to fix the clamping module 5 to the fixing module 4. Mount the fixture on the vise of the testing equipment for testing.

[0039] Example 3 A fixture suitable for scratch and nano-indentation testing of the flank face of an insert, wherein the insert 3 is a back-angle insert 3, and the fixture is used to perform scratch and nano-indentation testing on the flank face of the insert 3; the fixture includes a fixing module 4 and a clamping module 5 connected to each other, such as... Figure 4 and Figure 5As shown, the fixing module 4 and the clamping module 5 are an integrated structure, with clamp dimensions of 30×30×30 mm. A positioning groove 6 for accommodating the blade 3 is formed on one side 5b of the clamping module 5. The positioning groove 6 is recessed from the surface of the side 5b towards the inside of the clamping module 5, and the depth of the recess matches the thickness of the blade. Furthermore, the positioning groove 6 extends from the side 5b to the top surface 5a, so that when the blade 3 is placed in the positioning groove, one flank face of the blade protrudes from the top surface of the clamping module. Figure 4 As shown, in this embodiment, when the blade 3 is placed in the positioning groove 6, the rear cutting surface of the blade 3 faces upward and is parallel to the horizontal plane; the blade 3 is fixed to the clamping module 5 by using the fastener 11 through the positioning hole of the blade 3.

[0040] The difference between Embodiment 3 and Embodiment 2 is that the fixing module 4 and the clamping module 5 are integrated into one unit. Embodiment 3 does not require angle adjustment; a positioning groove 6 is directly created on the integrated module, and then the integrated module is clamped onto the vise of the testing equipment. In designing the positioning groove 6 in Embodiment 3, it is necessary to ensure that when the blade 3 is placed in the positioning groove 6, the rear cutting face of the blade 3 faces upward and is parallel to the horizontal plane.

[0041] The solution in Example 1 is suitable for inserts without a clearance angle. The solution in Example 2 is suitable for inserts with a clearance angle, and the rotation angle of the clamping module 5 can be adjusted according to the clearance angle to ensure that the clearance face of the insert 3 is parallel to the horizontal plane; the same fixture can be used for CNC inserts 3 of the same shape but different clearance angles; for inserts 3 of different shapes, the clamping module 5 needs to be replaced. The solution in Example 3 is suitable for inserts 3 with a clearance angle; the design of the positioning groove 6 ensures that the clearance face of the insert 3 is parallel to the horizontal plane, and it can accommodate inserts 3 of different thicknesses; for inserts with different clearance angles and different shapes, the fixture needs to be changed.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the present utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the scope of the present utility model.

Claims

1. A fixture suitable for testing the flank scratches and nanoindentations of cutting blades, comprising a fixing module and a clamping module interconnected; characterized in that, The clamping module has a positioning groove on one side for accommodating the blade. The positioning groove is recessed from the surface of the side of the clamping module toward the inside of the clamping module. The depth of the positioning groove recessing toward the inside of the clamping module matches the thickness of the blade. The positioning groove extends from the side to the top surface, so that when the blade is placed in the positioning groove, one of the back cutting faces upward and protrudes from the top surface of the clamping module. Secure the blade to the clamping module using fasteners that pass through the blade's positioning holes.

2. The fixture for testing blade flank scratches and nano-indentations according to claim 1, characterized in that, The blade is a back-angle blade, and the clamping module is connected to the fixing module through a rotary joint; when the blade is placed in the positioning groove, the back face of the blade faces upward.

3. The fixture for testing blade flank scratches and nano-indentations according to claim 2, characterized in that, Angle scale lines are provided on the mounting surfaces of the fixing module and the clamping module, and the angle scale lines are located below the clamping module.

4. The fixture for testing blade flank scratches and nano-indentations according to claim 3, characterized in that, When the clamping module is in a horizontal position, it corresponds to 0 degrees of the angle scale line, and the angle between the back face of the blade and the horizontal plane is equal to the back angle of the blade.

5. The fixture for testing blade flank scratches and nano-indentations according to claim 4, characterized in that, Both the fixing module and the clamping module are cubes.

6. The fixture for testing blade flank scratches and nano-indentations according to claim 5, characterized in that, The rotary joint is a threaded joint, including a threaded hole passing through the fixing module and the clamping module, and a screw that mates with the threaded hole.

7. The fixture for testing blade flank scratches and nano-indentations according to claim 6, characterized in that, The screw extends from the movable module, and a knob is fixed to the end of the extended part of the screw.

8. The fixture for testing blade flank scratches and nano-indentations according to claim 1, characterized in that, The clamping module is made of high-strength aluminum alloy or steel.

9. The fixture for testing blade flank scratches and nano-indentations according to claim 1, characterized in that, The fixing module and the clamping module are integrated into one structure. The blade is a back-angle blade. When the blade is placed in the positioning groove, the back cutting face of the blade faces upward and is parallel to the horizontal plane.

10. The fixture for testing blade flank scratches and nano-indentations according to claim 1, characterized in that, The maximum size of the fixture is 30×30×30 mm.

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