A diamond graphite milling cutter hardness testing device

Abstract

The present invention provides a diamond graphite milling cutter hardness testing device, which belongs to the testing field of diamond graphite milling cutters, and includes a Rockwell hardness tester, which is composed of a frame and a loading mechanism and a test bench arranged at its upper and lower ends, a pressure head being arranged at the lower end of the loading mechanism, and a limit adjustment unit being arranged at the upper end of the test bench. The limit adjustment unit adopted by the present invention can make the milling cutter in a fixed state rotate circumferentially, flexibly change the test point position of the milling cutter in the circumferential direction during the hardness test, and ensure that different points can perform effective hardness tests at the same time, obtain the hardness values ​​of multiple points from one test, increase the diversity of test data, improve the accuracy of test results, and also help to shorten the test time and improve the test efficiency.

Description

Technical Field

[0001] The invention relates to the field of testing of diamond graphite milling cutters, in particular to a device for testing the hardness of diamond graphite milling cutters. Background Art

[0002] Diamond graphite milling cutter is a cutting tool used for processing graphite materials. It has the characteristics of high hardness, wear resistance, high thermal conductivity, etc. It is usually used in high-precision processing fields such as processing graphite molds and graphite electrodes. Hardness testing is a key method to evaluate the quality and performance of diamond graphite milling cutters. By understanding the hardness level of the tool, the wear resistance and life of the tool can be determined. At the same time, the design and manufacturing process of the diamond graphite milling cutter can be optimized to improve the hardness and wear resistance of the tool. The hardness test of diamond graphite milling cutters is usually performed using a Rockwell hardness tester.

[0003] However, there are still the following problems in the process of hardness testing of diamond graphite milling cutters:

[0004] (1) During the hardness test, the location and number of the milling cutter test points are limited, so the test data obtained is relatively insufficient. The hardness test of the milling cutter may be affected by the location of the test points and the depth of the milling cutter spiral groove, which makes it difficult to fully understand the hardness distribution of the milling cutter.

[0005] (2) Usually, the test point of the milling cutter is manually changed. When faced with non-single-point testing of multiple milling cutters, this method is not only time-consuming and reduces the test efficiency, but also causes differences in the test points of different milling cutters due to human errors, resulting in low accuracy and reliability of the test results.

[0006] (3) Usually, the milling cutter to be tested is directly placed on the test table of the tester, and then the test table is moved upward. However, during the upward movement and when the tester applies downward pressure to the milling cutter, the stability of the milling cutter cannot be guaranteed. If the milling cutter is offset, it will directly affect the test result of that point.

[0007] Therefore, in order to solve the problems existing in the hardness test process of the diamond graphite milling cutter, the present invention provides a diamond graphite milling cutter hardness testing device. Summary of the invention

[0008] The invention provides a diamond graphite milling cutter hardness testing device, comprising a Rockwell hardness tester, the Rockwell hardness tester is composed of a frame and a loading mechanism and a test bench arranged at the upper and lower ends thereof, a pressure head is arranged at the lower end of the loading mechanism, and a limit adjustment unit is arranged at the upper end of the test bench; the limit adjustment unit comprises a vertical guide rail symmetrically arranged at the upper end of the test bench, a moving plate is slidably arranged up and down between the left and right vertical guide rails, an electric slider fixedly connected to the upper end surface of the moving plate is slidably arranged on the vertical guide rail, an installation groove is arranged at the upper end of the moving plate, a transverse guide rail is arranged between the left and right inner walls of the installation groove, and a sliding plate is slidably arranged on the transverse guide rail An electric skateboard is provided, and a supporting plate slidably connected to the moving plate is installed on the upper end of the electric skateboard; an L-shaped plate is provided on the upper end of the support plate, and a clamping assembly for fixing the milling cutter is provided on the upper end of the horizontal section of the L-shaped plate, and the clamping assembly includes a rotating column, a driven gear is installed on the left end of the rotating column, and a driving gear is meshed below the driven gear, and the left end of the driving gear is connected to the output shaft of the driving motor installed on the vertical section of the L-shaped plate, and a mounting rod located on the right side of the clamping assembly is provided on the upper end of the horizontal section of the L-shaped plate, and an arc-shaped support plate is installed on the upper end of the mounting rod, and a flip assembly for driving the L-shaped plate and the clamping assembly to rotate left and right as a whole is also provided on the upper end of the support plate.

[0009] In one possible implementation, the clamping assembly also includes a fixed ring installed at the upper end of the horizontal section of the L-shaped plate, a rotating plate is rotatably installed inside the fixed ring, the left end face of the rotating plate is fixedly connected to the rotating column, and an arc-shaped clamping plate symmetrical in upper and lower directions is provided at the right end of the rotating plate, the arc-shaped clamping plate located at the bottom is fixedly connected to the rotating plate, the arc-shaped clamping plate located at the top is slidably connected to the rotating plate up and down, and a threaded rod symmetrically installed in front and back and with threads passing through the arc-shaped clamping plate located at the top is installed at the upper end of the arc-shaped clamping plate located at the bottom.

[0010] In one possible implementation, the flip assembly includes a fixed frame symmetrically installed on the upper end of the support plate, turntables are installed on the front and rear ends of the L-shaped plate at right angles, and rotating gears are installed on the side away from the front and rear turntables. The rotating gears are rotatably connected to the rectangular plate installed on the upper end of the corresponding fixed frame, and the lower end of the rotating gear is meshed with a rack slidably connected to the fixed frame. A push block sliding through the fixed frame is installed at the lower end of the middle part of the rack, and the right end of the push block is connected to the push end of the cylinder installed at the lower end of the fixed frame. A support assembly for supporting the rotation of the L-shaped plate is provided at the upper right end of the support plate.

[0011] In one possible implementation, the support assembly includes a telescopic rod that is symmetrically hinged at the upper end of the right side of the support plate, a horizontal plate that is symmetrically installed at the lower end of the horizontal section of the L-shaped plate, and adjustment slots are provided at the lower end and front and rear ends of the cross plate. The telescopic section of the telescopic rod is slidably connected to the adjustment slot at the lower end of the cross plate, and a pin is rotatably installed at the upper end of the telescopic section of the telescopic rod, and the pin is slidably connected to the adjustment slots on the front and rear sides of the cross plate.

[0012] In a possible implementation, a front-to-rear symmetrical arc frame is installed on the upper end of the support plate, the arc frame is located between the front and rear fixed frames, an arc-shaped through groove is opened on the arc frame, and the arc frame located on the front side is engraved with scale lines evenly arranged along the arc-shaped through groove, and an inclined plate connected between the L-shaped vertical section and the horizontal section is provided on the side away from the front and rear arc frames, and the end of the inclined plate is slidably connected to the arc-shaped through groove, and the arc-shaped through groove is concentric with the turntable.

[0013] In a possible implementation, the driven gear, the rotating column and the rotating plate are all provided with through holes extending from left to right, and a horizontal scale plate located on the right side of the fixing ring is installed at the upper end of the L-shaped horizontal section.

[0014] In a possible implementation, a sliding groove is provided on the horizontal section of the L-shaped plate, a bolt slidably connected to the sliding groove is installed at the lower end of the mounting rod, and a nut is threadedly installed after the bolt passes through the sliding groove.

[0015] In one possible implementation, a fixing column is installed on the upper end of the rectangular plate located on the front side, a connecting plate is sleeved on the fixing column, an insertion rod is installed on the lower end of the connecting plate close to the turntable, and the outer ring surface of the turntable is provided with circumferentially evenly arranged holes that are plugged into and cooperate with the insertion rod.

[0016] In a possible implementation, the vertical guide rails are sleeved with limit rings, an inverted profile is connected between the limit rings on the left and right sides, and a left-right symmetrical vertical scale plate is installed at the front end of the frame of the Rockwell hardness tester.

[0017] In one possible implementation, a left-right symmetrical square frame is installed at the upper end of the transverse section of the inverted frame, and a square rod is installed in the square frame for forward and backward sliding. Square holes evenly arranged up and down are opened at the positions corresponding to the square rods at the front end of the frame, and the square rods are plugged into the corresponding square holes.

[0018] Beneficial effects of the present invention:

[0019] 1. The limit adjustment unit used in the present invention can make the milling cutter in a fixed state rotate circumferentially, flexibly change the test point of the milling cutter in the circumferential direction during the hardness test, and at the same time ensure that effective hardness tests can be performed at different points, and obtain the hardness values ​​of multiple points from one test, thereby increasing the diversity of test data, improving the accuracy of test results, and also facilitating the shortening of test time and improving test efficiency.

[0020] 2. The limit adjustment unit used in the present invention can also enable the milling cutter in a fixed state to move linearly left and right, adjust the test point of the milling cutter in the axial direction, and reduce the test error caused by material unevenness by testing at different axial positions. At the same time, different positions on the blade and spiral groove of the milling cutter are tested to obtain more accurate and comprehensive test results.

[0021] 3. The present invention can obtain more realistic test results by performing axial multi-point tests, circumferential multi-point tests and multi-point tests under inclined states on the milling cutter, which is helpful to predict the hardness performance of the tool under different conditions, comprehensively understand the hardness distribution of the milling cutter, evaluate the hardness performance of the milling cutter, and improve the accuracy and reliability of the test results.

[0022] 4. The present invention can provide stable and strong support for the milling cutter under different test conditions through the cooperation of the clamping assembly and the supporting assembly, thereby improving the stability of the milling cutter, ensuring that the milling cutter does not shake during movement and testing, and avoiding the displacement of the milling cutter position during testing and affecting the test results.

[0023] In addition to the technical problems solved by the embodiments of the present invention described above, the technical features that constitute the technical scheme, and the beneficial effects brought about by the technical features of the technical scheme, other technical problems that can be solved by a diamond graphite milling cutter hardness testing device provided by an embodiment of the present application, other technical features included in the technical scheme, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the main stereoscopic structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the movable plate, the supporting plate, the electric skateboard and the transverse guide rail of the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the limit adjustment unit of the present invention.

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the flip assembly and the supporting assembly of the present invention.

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the clamping assembly of the present invention.

[0030] Figure 6 It is a three-dimensional structural schematic diagram of the driving gear, the driven gear and the rotating plate of the present invention.

[0031] In the figure: 1. Rockwell hardness tester; 11. test bench; 12. limit adjustment unit; 121. vertical guide rail; 122. moving plate; 124. transverse guide rail; 125. electric skateboard; 126. support plate; 127. L-shaped plate; 128. fixing ring; 129. rotating plate; 130. arc clamping plate; 131. threaded rod; 132. rotating column; 133. driven gear; 134. driving gear; 135. driving motor; 136. mounting rod; 137. arc support plate; 138. Sliding slot; 139, through hole; 140, fixed frame; 141, turntable; 142, rotating gear; 143, rectangular plate; 144, rack; 145, cylinder; 146, fixed column; 147, plug rod; 148, plug hole; 149, telescopic rod; 150, horizontal plate; 151, adjustment slot; 152, arc frame; 153, arc slot; 154, inclined plate; 155, limit ring; 156, inverted frame; 157, square frame; 158, square rod; 159, square hole. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] See also Figure 1 A diamond graphite milling cutter hardness testing device includes a Rockwell hardness tester 1, which is composed of a frame and a loading mechanism and a test bench 11 arranged at the upper and lower ends thereof. A pressure head is arranged at the lower end of the loading mechanism, and a limit adjustment unit 12 is arranged at the upper end of the test bench 11.

[0034] See also Figure 1 and Figure 2 The limit adjustment unit 12 includes a vertical guide rail 121 symmetrically installed on the upper end of the test bench 11, a movable plate 122 is slidably installed between the left and right vertical guide rails 121, an electric slider fixedly connected to the upper end surface of the movable plate 122 is slidably installed on the vertical guide rail 121, an installation groove is opened at the upper end of the movable plate 122, a transverse guide rail 124 is installed between the left and right inner walls of the installation groove, an electric slide plate 125 is slidably installed on the transverse guide rail 124, and a support plate 126 slidably connected to the movable plate 122 is installed on the upper end of the electric slide plate 125.

[0035] See also Figure 1 , Figure 3 , Figure 5 and Figure 6An L-shaped plate 127 is provided at the upper end of the support plate 126, and a clamping assembly for fixing the milling cutter is provided at the upper end of the horizontal section of the L-shaped plate 127. The clamping assembly includes a fixing ring 128 installed at the upper end of the horizontal section of the L-shaped plate 127, and a rotating plate 129 is rotatably installed inside the fixing ring 128. An arc-shaped clamping plate 130 symmetrically arranged at the right end of the rotating plate 129 is provided. The arc-shaped clamping plate 130 located at the bottom is fixedly connected to the rotating plate 129, and the arc-shaped clamping plate 130 located at the top is slidably connected to the rotating plate 129 up and down. A threaded rod 131 symmetrically arranged at the front and back and having threads passing through the arc-shaped clamping plate 130 located at the top is installed at the upper end of the arc-shaped clamping plate 130.

[0036] See also Figure 3 , Figure 5 and Figure 6 The left end of the rotating plate 129 is equipped with a rotating column 132, and the left end of the rotating column 132 is equipped with a driven gear 133. A driving gear 134 is meshed below the driven gear 133. The left end of the driving gear 134 is connected to the output shaft of a driving motor 135 installed on the vertical section of the L-shaped plate 127. The upper end of the horizontal section of the L-shaped plate 127 is provided with a mounting rod 136 located on the right side of the clamping assembly. The upper end of the mounting rod 136 is equipped with an arc-shaped support plate 137. The horizontal section of the L-shaped plate 127 is provided with a sliding The movable through groove 138, the lower end of the mounting rod 136 is equipped with a bolt that is slidably connected to the sliding through groove 138, and a nut is threadedly installed after the bolt passes through the sliding through groove 138. The driven gear 133, the rotating column 132 and the rotating plate 129 are all provided with through holes 139 that pass through the left and right. The upper end of the horizontal section of the L-shaped plate 127 is equipped with a horizontal scale plate located on the right side of the fixing ring 128, and the upper end of the support plate 126 is also provided with a flip assembly for driving the L-shaped plate 127 and the clamping assembly to rotate left and right as a whole.

[0037] During work: Before performing a hardness test on the milling cutter, the milling cutter must first be clamped and fixed by a clamping assembly. Specifically, the milling cutter can be placed horizontally on the right end of the rotating plate 129, and supported by the arc-shaped support plate 137 located below. The arc-shaped support plate 137 can not only ensure that the milling cutter is in a horizontal and stable state, but also provide a stable supporting force for subsequent hardness tests. Then, the threaded rods 131 on the front and rear sides can be rotated at the same time, so that the arc-shaped clamping plate 130 located above moves downward along the rotating plate 129 until it is pressed against the milling cutter. The milling cutter is fixed by the cooperation between the upper and lower arc-shaped clamping plates 130, ensuring that the milling cutter will not move or shake during the test, so that the hardness test of the milling cutter can be performed stably later.

[0038] In addition, the driven gear 133, the rotating column 132 and the through hole 139 on the rotating plate 129 can be used to move the milling cutter left and right before being fixed, and the milling cutter can be accurately moved left and right to a specific position along the through hole 139 with the help of the horizontal scale plate to adjust the clamping point of the upper and lower arc clamps 130 on the milling cutter. The clamping force of the milling cutter at different clamping points also changes. Subsequently, the hardness test of the milling cutter in different clamping states can be carried out multiple times, and the clamping points of the milling cutter can be recorded to obtain the hardness under different clamping states. The test results can be used to more comprehensively test whether the milling cutter has potential defects or unevenness, thereby ensuring the accuracy and reliability of the test results. At the same time, the bolt can be slid left and right along the sliding groove 138 according to the clamping state of the milling cutter, and the mounting rod 136 and the arc-shaped support plate 137 will move synchronously therewith, and the arc-shaped support plate 137 will be moved to a position that can stably support the milling cutter. Then, the mounting rod 136 and the arc-shaped support plate 137 can be fixed to the upper end of the horizontal section of the L-shaped plate 127 by the cooperation of nuts and bolts, so as to implement bottom support for the position to be tested of the milling cutter.

[0039] Secondly, the driving motor 135 can also be used to drive the driving gear 134 to rotate, and the driving gear 134 can drive the driven gear 133 to rotate synchronously. The driven gear 133 can drive the rotating plate 129 to rotate synchronously through the rotating column 132. At this time, the rotating plate 129 can drive the milling cutter in a fixed state to rotate synchronously through the cooperation between the upper and lower arc-shaped clamping plates 130, so as to change the force points of the milling cutter in the circumferential direction during subsequent hardness tests, increase the position diversity of the force points, obtain hardness values ​​of multiple points in one test, increase test data, and improve test efficiency and the accuracy of test results.

[0040] See also Figure 1-Figure 4 The flip assembly includes a fixing frame 140 symmetrically mounted on the upper end of the support plate 126, and a turntable 141 is mounted on both ends of the front and rear ends of the L-shaped plate 127 at a right angle. A rotating gear 142 is mounted on the side away from the front and rear turntables 141. The rotating gear 142 is rotatably connected to a rectangular plate 143 mounted on the upper end of the corresponding fixing frame 140. The lower end of the rotating gear 142 is meshed with a rack 144 slidably connected to the fixing frame 140. The lower end of the middle part of the rack 144 is equipped with a gear 144 that slides through the fixing frame. The push block 140 has its right end connected to the pushing end of the cylinder 145 installed at the lower end of the fixed frame 140, and a fixing column 146 is installed at the upper end of the rectangular plate 143 located on the front side. A connecting plate is sleeved on the fixing column 146, and an insert rod 147 is installed at the lower end of the connecting plate close to the turntable 141. The outer ring surface of the turntable 141 is provided with circumferentially evenly arranged sockets 148 that are plugged into the insert rod 147, and a support assembly for supporting the rotation of the L-shaped plate 127 is provided at the upper right end of the support plate 126.

[0041] See also Figure 3 and Figure 4The support assembly includes a telescopic rod 149 which is symmetrically hinged at the upper end of the right side of the support plate 126. A horizontal plate 150 which is symmetrically installed at the lower end of the horizontal section of the L-shaped plate 127. Adjustment slots 151 are provided at the lower end and front and rear ends of the cross plate 150. The telescopic section of the telescopic rod 149 is slidably connected to the adjustment slot 151 at the lower end of the cross plate 150. A pin is rotatably installed at the upper end of the telescopic section of the telescopic rod 149. The pin is slidably connected to the adjustment slots 151 on the front and rear sides of the cross plate 150.

[0042] See also Figure 2-Figure 5 A front-to-rear symmetrical arc frame 152 is installed on the upper end of the support plate 126. The arc frame 152 is located between the front and rear fixing frames 140. An arc through groove 153 is opened on the arc frame 152. The arc frame 152 located on the front side is engraved with scale lines evenly arranged along the arc through groove 153. The sides away from the front and rear arc frames 152 are both provided with an inclined plate 154 connected between the vertical section and the horizontal section of the L-shaped plate 127. The end of the inclined plate 154 is slidably connected to the arc through groove 153, and the arc through groove 153 is coaxial with the turntable 141.

[0043] During operation: before the hardness test of the milling cutter is performed, the cylinders 145 on the front and rear sides can simultaneously push the corresponding push blocks and the racks 144 to move left and right along the corresponding fixed frame 140. During the movement of the rack 144, the rotating gear 142 drives the turntable 141 to rotate synchronously. Under the action of the rotating gears 142 and the turntable 141 on the front and rear sides, the L-shaped plate 127 can drive the driving motor 135, the driving gear 134, the driven gear 133, the clamping assembly and the milling cutter to rotate synchronously as a whole. The arc frame 152 and the arc through groove 153 can guide and support the rotation of the L-shaped plate 127, and the inclined plate 154 can strengthen the connection stability between the vertical section and the horizontal section of the L-shaped plate 127 and the arc frame 152 In order to further ensure the stability of the L-shaped plate 127 during the rotation process, during the rotation process of the L-shaped plate 127, the telescopic rods 149 on the front and rear sides are synchronously extended and retracted and rotated around the hinge point between them and the support plate 126. As the L-shaped plate 127 rotates, the telescopic section and the pin shaft of the telescopic rod 149 can slide along the adjustment groove 151 on the cross plate 150 accordingly. Using the telescopic plate to support the L-shaped plate 127 can prevent the L-shaped plate 127 from being in a cantilever state during the hardness test, and avoid the L-shaped plate 127 in the cantilever state from shaking when it is under pressure, thereby increasing the stability of the L-shaped plate 127, which is beneficial to improving the test accuracy and test efficiency and ensuring the safety during the test.

[0044] With the help of the scale lines on the arc frame 152, the L-shaped plate 127, the clamping assembly and the milling cutter can be rotated to a suitable angle as a whole, and then the connecting plate and the plug rod 147 can be moved along the fixed column 146 to above the turntable 141, and then the connecting plate can be moved downward along the fixed column 146 and the plug rod 147 can be inserted into the socket 148 on the turntable 141. The rotation of the turntable 141 can be limited by the cooperation between the plug rod 147 and the socket 148 to ensure that the turntable 141, the rotating gear 142 and the L-shaped plate 127 are in a fixed state, preventing the L-shaped plate 127 from being affected by external force and rotating again after being rotated to a suitable angle. When the L-shaped plate 127 needs to be rotated again in the future, the connecting plate and the plug rod 147 can be moved along the fixed column 146 to be reset away from the turntable 141. At this time, the turntable 141, the rotating gear 142 and the L-shaped plate 127 can continue to rotate.

[0045] When the L-shaped plate 127 in a horizontal state rotates 90 degrees, the milling cutter rotates synchronously from a horizontal state to a vertical state. At this time, the hardness test can be performed on the top of the milling cutter. When the L-shaped plate 127 rotates to an inclined state, the milling cutter is synchronously tilted. At this time, the hardness test can be performed on the milling cutter body in an inclined state. The pressure direction and magnitude of the milling cutter at different inclination angles in the hardness test are also different. Through multi-directional and multi-point pressure tests, more accurate test results can be obtained. In addition, the inclination angles of the L-shaped plate 127 and the milling cutter need to be recorded corresponding to the scale lines on the arc frame 152, so as to compare and analyze the test results later.

[0046] After the milling cutter is adjusted to a suitable test state, the support plate 126 can be driven by the electric slide 125 to move left and right along the transverse guide rail 124, and the support plate 126 drives the flip assembly, the clamping assembly and the milling cutter to move synchronously as a whole, so as to move the milling cutter to directly below the pressure head of the Rockwell hardness tester 1, and then the movable plate 122 can be driven by the electric sliders on the left and right sides to move upward along the left and right vertical guide rails 121 at the same time, and the movable plate 122 drives the support plate 126, the flip assembly, the clamping assembly and the milling cutter to move upward synchronously as a whole. Before the milling cutter moves up to the hardness test position, the support plate 126 can be driven by the electric slide 125 again to move left and right along the transverse guide rail 124 to adjust the left and right position of the milling cutter, change the test point of the subsequent milling cutter, realize multi-point testing in the axial direction, increase detection data, reduce test errors, ensure the reliability of test results, and improve test efficiency.

[0047] Before the hardness test, the Rockwell hardness tester 1 needs to be adjusted to zero to ensure that it is in a good calibration state. Then, a small preload can be applied to the indenter through the loading mechanism. After the milling cutter is moved to a suitable test point, the electric slider can be used to drive it up again until it is in slight contact with the indenter, so that the indenter is stably positioned on the milling cutter. On the basis of the preload, the main load is quickly applied to the milling cutter through the loading mechanism and maintained for a period of time (usually 2-3 seconds). Then, the main load can be quickly released, but the preload is retained to allow the indenter to continue to contact the test point of the milling cutter. When the main load is completely unloaded, the Rockwell hardness tester 1 will automatically read the change in the indentation depth, thereby calculating the hardness value of the milling cutter. At this time, the obtained hardness value can be recorded according to the digital display on the Rockwell hardness tester 1.

[0048] After completing the test of one point on the milling cutter, the electric slider can be used to move the milling cutter as a whole downward along the vertical guide rail 121 along the movable plate 122, the support plate 126, the flip assembly, the clamping assembly and the milling cutter away from the pressure head. Then the milling cutter can be rotated circumferentially to a certain angle in the manner described above, and the hardness test can be performed on different points in the circumferential direction of the milling cutter in the same manner. In addition, the milling cutter can be moved left and right in the manner described above, so that the pressure head can perform hardness tests on different points in the axial direction of the milling cutter. At the same time, the milling cutter can be moved left and right while rotating the milling cutter circumferentially to perform hardness tests on different positions on the blade or spiral groove part of the milling cutter. In addition, the inclination angle of the milling cutter can be adjusted in the manner described above to change the direction in which the test force acts on the milling cutter. By performing axial multi-point tests, circumferential multi-point tests and multi-point tests in an inclined state on the milling cutter, more realistic test results can be obtained, which is helpful to predict the hardness performance of the tool under different cutting conditions, comprehensively evaluate the hardness performance of the milling cutter, and improve the accuracy and reliability of the test results.

[0049] See also Figure 1 The vertical guide rails 121 are sleeved with limit rings 155, and an inverted frame 156 is connected between the limit rings 155 on the left and right sides. A left-right symmetrical square frame 157 is installed on the upper end of the horizontal section of the inverted frame 156. A square rod 158 is slidably installed in the square frame 157. The front end of the frame corresponding to the square rod 158 is provided with square holes 159 evenly arranged up and down. The square rod 158 is plugged into the corresponding square hole 159. The front end of the frame of the Rockwell hardness tester 1 is installed with a left-right symmetrical vertical scale plate.

[0050] In the process of the electric slider driving the support plate 126 to move upward along the vertical guide rail 121, the limit ring 155 on the vertical guide rail 121 can limit the movement of the electric slider to ensure that the electric slider can drive the milling cutter to move to a suitable test position to avoid insufficient or excessive contact between the milling cutter and the pressure head. In addition, when the milling cutter is tilted at a certain angle, the distance between different test points on the milling cutter and the pressure head changes synchronously, and the height of the electric slider moving upward changes synchronously. At this time, the square rod 158 can be moved to disengage from the square hole 159 , and then the inverted frame 156 can be moved up and down corresponding to the vertical scale plate, and the limit rings 155 on the left and right sides move synchronously with the inverted frame 156 along the corresponding vertical guide rails 121 until the limit rings 155 move to a suitable position, so that the limit rings 155 can limit the electric slider with different movement requirements, and then the square rod 158 can be moved backward along the square frame 157 and the square rod 158 can be plugged into the square hole 159 again to fix the inverted frame 156 on the frame, and the limit rings 155 are fixed on the vertical guide rails 121.

[0051] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A diamond graphite milling cutter hardness testing device, comprising a Rockwell hardness tester (1), the Rockwell hardness tester (1) comprising a frame and a loading mechanism arranged at the upper and lower ends thereof and a test bench (11), a pressure head being arranged at the lower end of the loading mechanism, characterized in that: A limit adjustment unit (12) is provided at the upper end of the test bench (11); The limit adjustment unit (12) comprises a vertical guide rail (121) symmetrically mounted on the upper end of the test bench (11); a movable plate (122) is slidably mounted between the left and right vertical guide rails (121); an electric slider fixedly connected to the upper end surface of the movable plate (122) is slidably mounted on the vertical guide rail (121); a mounting groove is provided at the upper end of the movable plate (122); a transverse guide rail (124) is mounted between the left and right inner walls of the mounting groove; an electric slide plate (125) is slidably mounted on the transverse guide rail (124); and a support plate (126) slidably connected to the movable plate (122) is mounted at the upper end of the electric slide plate (125); The upper end of the support plate (126) is provided with an L-shaped plate (127), the upper end of the horizontal section of the L-shaped plate (127) is provided with a clamping assembly for fixing the milling cutter, the clamping assembly comprises a rotating column (132), the left end of the rotating column (132) is provided with a driven gear (133), a driving gear (134) is meshed below the driven gear (133), the left end of the driving gear (134) is connected to the output shaft of a driving motor (135) installed on the vertical section of the L-shaped plate (127), the upper end of the horizontal section of the L-shaped plate (127) is provided with a mounting rod (136) located on the right side of the clamping assembly, the upper end of the mounting rod (136) is provided with an arc-shaped supporting plate (137), and the upper end of the support plate (126) is also provided with a flip assembly for driving the L-shaped plate (127) and the clamping assembly to rotate left and right as a whole.

2. A diamond graphite milling cutter hardness testing device according to claim 1, characterized in that: The clamping assembly also includes a fixing ring (128) installed at the upper end of the horizontal section of the L-shaped plate (127), a rotating plate (129) is rotatably installed inside the fixing ring (128), the left end surface of the rotating plate (129) is fixedly connected to the rotating column (132), and the right end of the rotating plate (129) is provided with an arc-shaped clamping plate (130) symmetrical in upper and lower directions, the arc-shaped clamping plate (130) located at the bottom is fixedly connected to the rotating plate (129), and the arc-shaped clamping plate (130) located at the top is connected to the rotating plate (129) in an upper and lower sliding manner, and a threaded rod (131) symmetrical in front and back and threadedly penetrating the arc-shaped clamping plate (130) located at the top is installed at the upper end of the arc-shaped clamping plate (130).

3. A diamond graphite milling cutter hardness testing device according to claim 1, characterized in that: The flip assembly comprises a fixed frame (140) symmetrically mounted on the upper end of the support plate (126) in front and back directions, a turntable (141) is mounted on both the front and rear ends at a right angle of the L-shaped plate (127), a rotating gear (142) is mounted on the side away from the front and rear turntables (141), the rotating gear (142) is rotatably connected to a rectangular plate (143) mounted on the upper end of the corresponding fixed frame (140), a rack (144) slidably connected to the fixed frame (140) is meshed at the lower end of the rotating gear (142), a push block slidably penetrating the fixed frame (140) is mounted at the lower end of the middle part of the rack (144), the right end of the push block is connected to the pushing end of a cylinder (145) mounted at the lower end of the fixed frame (140), and a support assembly for supporting the rotation of the L-shaped plate (127) is arranged at the upper right end of the support plate (126).

4. A diamond graphite milling cutter hardness testing device according to claim 3, characterized in that: The support assembly comprises a telescopic rod (149) symmetrically hinged to the upper right end of the support plate (126); a horizontal plate (150) symmetrically mounted to the lower end of the horizontal section of the L-shaped plate (127); an adjustment slot (151) is provided at the lower end and front and rear ends of the cross plate (150); the telescopic section of the telescopic rod (149) is slidably connected to the adjustment slot (151) at the lower end of the cross plate (150); a pin is rotatably mounted on the upper end of the telescopic section of the telescopic rod (149); the pin is slidably connected to the adjustment slots (151) at the front and rear sides of the cross plate (150).

5. A diamond graphite milling cutter hardness testing device according to claim 3, characterized in that: A front-to-rear symmetrical arc frame (152) is installed at the upper end of the support plate (126), the arc frame (152) is located between the front and rear fixed frames (140), an arc through groove (153) is opened on the arc frame (152), and scale lines evenly arranged along the arc through groove (153) are engraved on the front arc frame (152), and an inclined plate (154) connected between the L-shaped vertical section and the horizontal section is arranged on the side away from the front and rear arc frames (152), and the end of the inclined plate (154) is slidably connected to the arc through groove (153), and the arc through groove (153) and the rotating disk (141) are cocentric.

6. A diamond graphite milling cutter hardness testing device according to claim 2, characterized in that: The driven gear (133), the rotating column (132) and the rotating plate (129) are all provided with through holes (139) which pass through the left and right sides, and a horizontal scale plate located on the right side of the fixing ring (128) is installed at the upper end of the L-shaped horizontal section.

7. A diamond graphite milling cutter hardness testing device according to claim 1, characterized in that: A sliding groove (138) is provided on the horizontal section of the L-shaped plate (127), and a bolt slidably connected to the sliding groove (138) is installed at the lower end of the mounting rod (136). A nut is threadedly installed after the bolt passes through the sliding groove (138).

8. A diamond graphite milling cutter hardness testing device according to claim 3, characterized in that: A fixing column (146) is installed at the upper end of the rectangular plate (143) located at the front side, a connecting plate is sleeved on the fixing column (146), an insert rod (147) is installed at the lower end of the connecting plate on the side close to the rotating disk (141), and the outer ring surface of the rotating disk (141) is provided with circumferentially evenly arranged insert holes (148) that are plugged into and matched with the insert rod (147).

9. A diamond graphite milling cutter hardness testing device according to claim 1, characterized in that: The vertical guide rails (121) are sleeved with limit rings (155), and an inverted profile frame (156) is connected between the limit rings (155) on the left and right sides. The front end of the frame of the Rockwell hardness tester (1) is equipped with a vertical scale plate that is symmetrical on both sides.

10. A diamond graphite milling cutter hardness testing device according to claim 9, characterized in that: A left-right symmetrical square frame (157) is installed at the upper end of the transverse section of the inverted profile frame (156), and a square rod (158) is slidably installed in the square frame (157) forward and backward. Square holes (159) evenly arranged up and down are opened at the positions corresponding to the square rods (158) at the front end of the frame, and the square rods (158) are plugged into the corresponding square holes (159).

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