A device for testing the tensile degree of a pcbn cutter and a testing method thereof

Abstract

The application relates to the technical field of PCBN cutter machining detection, in particular to a PCBN cutter tensile degree testing device, which comprises a base and a moving seat arranged on the base, an installation cavity is arranged in the moving seat, a hydraulic rod is fixedly connected to one side of the base, a pull rod is fixedly connected to the movable end of the hydraulic rod and extends into the installation cavity and is in sliding connection with the moving seat, a pressing plate is fixedly connected to one end of the pull rod in the installation cavity, a pressure sensor is arranged on the inner wall of one side of the installation cavity, a contact plate is fixedly connected to the inner wall of the side of the installation cavity away from the pressure sensor, and the side, close to the pressure sensor, of the contact plate is connected with a conductive contact point. The anti-rebound assembly is used to make the contact plate be clamped between the installation cavity and the pressing plate at the moment of cutter fracture, so that the movement of the moving seat is limited, the moving seat can be stopped, the back and forth shaking of the moving seat under the action of inertia and the elastic force of the first spring is prevented, and the damage of the equipment caused by the reciprocating impact is avoided.

Description

Technical Field

[0001] This invention relates to a tensile testing device, and more particularly to a PCBN tool tensile testing device and its testing method, belonging to the field of PCBN tool processing and testing technology. Background Technology

[0002] Cutting tools are among the most commonly used tools in the machining industry, and their tensile strength and bending strength are important indicators for judging their performance. In industrial production, cutting tools are used frequently; if their tensile strength is insufficient, breakage and other problems can easily occur, seriously affecting production efficiency and quality. The cutting edge is often used to process various materials, enduring enormous pressure during processing. If its compressive strength is insufficient, bending, deformation, and breakage can easily occur, affecting product precision and efficiency. Therefore, testing the tensile strength of cutting tools is crucial.

[0003] Currently, when performing tensile testing on PCBN cutting tools, due to the high hardness of PCBN tools, which is second only to diamond, the PCBN tool will suddenly break when the tensile force reaches a level it cannot withstand. The power device applying the tensile force will not stop immediately due to inertia. At the moment of breakage, the power device and even the testing device will be damaged, affecting the testing work.

[0004] Therefore, it is urgent to improve the PCBN tool tensile strength testing device to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a PCBN tool tensile strength testing device and method, which can use an anti-rebound component to lock the contact plate between the mounting cavity and the pressure plate at the moment the tool breaks, thereby restricting the movement of the moving seat and stopping the moving seat. This prevents the moving seat from swaying back and forth under the action of inertia and the elastic force of the first spring, and avoids damage to the equipment caused by reciprocating impacts.

[0006] To achieve the above objectives, the main technical solution adopted by the present invention includes: a PCBN tool tensile strength testing device, comprising a base and a movable seat disposed on the base, wherein the movable seat has an internal mounting cavity, a hydraulic rod is fixedly connected to one side of the base, a pull rod extending into the mounting cavity and slidably connected to the movable seat is fixedly connected to the movable end of the hydraulic rod, a pressure plate is fixedly connected to one end of the pull rod located inside the mounting cavity, a pressure sensor is disposed on one inner wall of the mounting cavity, an abutment plate is fixedly connected to the inner wall of the mounting cavity away from the pressure sensor, a conductive contact is connected to the side of the abutment plate close to the pressure sensor, and a first spring is connected between the pressure plate and the inner wall of the mounting cavity where the pressure sensor is disposed, and an anti-rebound component is disposed inside the mounting cavity to prevent the movable seat from rebounding;

[0007] The anti-rebound assembly includes two movable cavities formed on the bottom inner wall of the mounting cavity and a touch plate slidably connected inside the movable cavities. A second spring is connected between the bottom end of the touch plate and the bottom inner wall of the movable cavity.

[0008] A fixed plate is connected to one side of the movable seat, and a first support rod is provided on the fixed plate. A second support rod parallel to the first support rod is connected to one end of the base near the first support rod.

[0009] Preferably, the movable seat has a limiting groove, and a lifting bracket is slidably connected inside the limiting groove. A motor is fixedly connected to the upper end of the movable seat, and the output end of the motor is connected to a lead screw that is rotatably connected to the inner wall of the bottom of the limiting groove. The lead screw passes through the lifting bracket and is threadedly connected to the lifting bracket.

[0010] Preferably, electromagnets are provided on both the bottom surface of the lifting bracket and the upper surface of the fixing plate.

[0011] Preferably, the first support rod is integrally formed with the fixed plate, and the second support rod is integrally formed with the base.

[0012] Preferably, each of the two touch panels has a connecting rod connected to its opposite side, and the two connecting rods are fixedly connected to a grip rod at one end extending to the outside of the movable seat.

[0013] Preferably, when the pressure plate is attached to the pressure sensor, the distance between the side wall of the pressure plate closest to the pressure sensor and the inner wall of the mounting cavity is equal to the thickness of the contact plate.

[0014] Preferably, the base is provided with a sliding rail, and the movable seat is slidably connected to the base through the sliding rail.

[0015] Preferably, the upper end of the touch plate is provided with a first pressing part, and the bottom of the pressure plate on the side opposite to the touch plate is provided with a second pressing part corresponding to the first pressing part.

[0016] A test method for a PCBN tool tensile strength testing device includes the following steps:

[0017] S1: First, bring the first support rod close to the second support rod, and fit the connecting hole on the tool onto the first and second support rods. Drive the lead screw to rotate through the motor, so that the lifting chuck is locked on the first support rod and moves to the top of the tool to limit the tool.

[0018] S2: Then the hydraulic rod drives the pull rod to move, so that the pressure plate compresses the first spring and comes into contact with the pressure sensor;

[0019] S3: At the moment the tool breaks, the moving seat slides back and forth on the pull rod under the action of inertia and the first spring, so that the first extrusion part generates extrusion force on the second extrusion part. Under the action of the extrusion force, the touch plate compresses the second spring and moves downward. The moving seat drives the touch plate to move to the end of the pressure plate close to the pressure sensor. At this time, the second extrusion part releases the extrusion force on the first extrusion part. Under the action of the second spring, the touch plate moves upward, so that the touch plate is stuck between the pressure plate and the inner wall of the mounting cavity. At this time, the conductive contact is always in contact with the pressure plate, stopping the hydraulic rod from continuing to move.

[0020] Preferably, to further improve the accuracy of the tensile strength test of PCBN tools, the tool can be placed under conditions of 21°C-23°C and 57%-63% relative humidity for 24h-48h and then tested again.

[0021] This invention has at least the following beneficial effects:

[0022] 1. The anti-rebound component locks the contact plate between the mounting cavity and the pressure plate at the moment the tool breaks, thereby restricting the movement of the moving seat and stopping it. This prevents the moving seat from swaying back and forth due to inertia and the force of the first spring, thus avoiding damage to the equipment caused by reciprocating impacts. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0024] Figure 1 Isometric structure schematic provided by the present invention Figure 1 ;

[0025] Figure 2 Isometric structure schematic provided by the present invention Figure 2 ;

[0026] Figure 3 The left view provided for this invention;

[0027] Figure 4 Provided by the present invention Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0028] Figure 5 Provided by the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0029] In the diagram, 1. Base; 11. Movable seat; 12. Mounting cavity; 13. Hydraulic rod; 14. Pull-out rod; 15. Pressure plate; 16. Pressure sensor; 17. Contact plate; 18. Conductive contact; 19. First spring; 101. Movable cavity; 102. Contact plate; 103. Second spring; 104. Fixed plate; 105. First support rod; 106. Second support rod; 2. Limiting slide groove; 201. Lifting seat; 202. Motor; 203. Lead screw; 3. Electromagnet; 4. Connecting rod; 401. Handle; 5. Sliding rail; 6. First extrusion section; 601. Second extrusion section; 7. Cutting tool. Detailed Implementation

[0030] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0031] like Figures 1-5As shown, the PCBN tool tensile strength testing device provided in this embodiment includes a base 1 and a movable seat 11 disposed on the base 1. A fixed plate 104 is connected to one side of the movable seat 11, and a first support rod 105 is provided on the fixed plate 104. A second support rod 106 parallel to the first support rod 105 is connected to one end of the base 1 near the first support rod 105. First, the connecting hole on the tool 7 is fitted onto the first support rod 105 and the second support rod 106. An installation cavity 12 is opened inside the movable seat 11. A hydraulic rod 13 is fixedly connected to one side of the base 1. The hydraulic rod 13 is used to drive the movable seat 11 to move on the base 1. A sliding rail 5 is opened on the base 1. The sliding rail 5 limits the movement of the movable seat 11, so that the movable seat 11 can only move on the base 1. Maintaining linear motion, the movable seat 11 is slidably connected to the base 1 via the sliding rail 5. The movable end of the hydraulic rod 13 is fixedly connected to a pull rod 14 that extends into the mounting cavity 12 and is slidably connected to the movable seat 11. One end of the pull rod 14 located inside the mounting cavity 12 is fixedly connected to a pressure plate 15. A pressure sensor 16 is provided on one side of the inner wall of the mounting cavity 12. When the hydraulic rod 13 drives the pull rod 14 and the pressure plate 15 to move, the pressure plate 15 abuts against the pressure sensor 16. By electrically connecting the pressure sensor 16 to an external display device, the pressure value of the pressure plate 15 on the pressure sensor 16 can be observed. The tension of the first support rod 105 on the tool 7 in the connection hole is converted into the pressure received by the pressure sensor 16 to realize the detection of the tensile performance of the tool 7.

[0032] A contact plate 17 is fixedly connected to the inner wall of the mounting cavity 12 away from the pressure sensor 16. A conductive contact 18 is connected to the side of the contact plate 17 close to the pressure sensor 16. A first spring 19 is connected between the pressure plate 15 and the inner wall of the mounting cavity 12 where the pressure sensor 16 is located. The mounting cavity 12 is equipped with an anti-rebound component to prevent the moving seat 11 from rebounding. At the moment the cutter 7 breaks, the moving seat 11 drives the conductive contact to reciprocate under the action of the first spring 19 and inertia. When the conductive contact comes into contact with the pressure plate 15, the conductive contact closes the hydraulic rod 13 and stops the movement of the moving seat 11.

[0033] The anti-rebound assembly includes two movable cavities 101 formed on the bottom inner wall of the mounting cavity 12 and a touch plate 102 slidably connected inside the movable cavity 101. A second spring 103 is connected between the bottom end of the touch plate 102 and the bottom inner wall of the movable cavity 101. When the moving seat 11 reciprocates under the action of inertia, the first pressing part 6 generates a pressing force on the second pressing part 601. Under the action of the pressing force, the touch plate 102 compresses the second spring 103 and moves downward. The moving seat 11 drives the touch plate 102 to move to the end of the pressure plate 15 close to the pressure sensor 16. At this time, the second pressing part 601 releases the pressing force on the first pressing part 6. Under the action of the second spring 103, the touch plate 102 moves upward, so that the touch plate 102 is stuck between the pressure plate 15 and the inner wall of the mounting cavity 12, stopping the moving seat 11 from continuing to move, so as to prevent the moving seat 11 from impacting and damaging some parts due to reciprocating motion.

[0034] Furthermore, such as Figure 5 As shown, the upper end of the touch plate 102 is provided with a first pressing part 6, and the bottom of the side of the pressure plate 15 opposite to the touch plate 102 is provided with a second pressing part 601 corresponding to the first pressing part 6. Both the first pressing part 6 and the second pressing part 601 are inclined, which can make the touch plate 102 better abut against the pressure plate 15. When the pressure plate 15 is attached to the pressure sensor 16, the distance between the side wall of the pressure plate 15 near the pressure sensor 16 and the inner wall of the mounting cavity 12 is equal to the thickness of the touch plate 102. This can prevent the touch plate 102 from shaking back and forth between the pressure plate 15 and the inner wall of the mounting cavity 12, thereby making the moving seat 11 more stable.

[0035] Furthermore, such as Figure 2 As shown, each of the two touch plates 102 is connected to a connecting rod 4 on its opposite side. The two connecting rods 4 extend to the outer side of the movable seat 11 and are fixedly connected to a gripping rod 401. When the movable seat 11 needs to be reset, the gripping rod 401 drives the two connecting rods 4 to move downward, causing the connecting rods 4 to drive the touch plate 102 to compress the second spring 103 and move downward. Moving the touch plate 102 downward can disengage it from the pressure plate 15 and also disconnect the conductive contact 18 from the pressure plate 15.

[0036] Furthermore, such as Figure 1As shown, a limiting groove 2 is provided on the movable seat 11. A lifting seat 201 is slidably connected inside the limiting groove 2. A motor 202 is fixedly connected to the upper end of the movable seat 11. The output end of the motor 202 is connected to a lead screw 203 that is rotatably connected to the bottom inner wall of the limiting groove 2. The lead screw 203 passes through the lifting seat 201 and is threadedly connected to the lifting seat 201. Under the limiting action of the limiting groove 2 on the lifting seat 201, when the motor 202 drives the lead screw 203 to rotate, the lifting seat 201 can move up and down, so that the lifting seat falls on the upper end of the tool 7, preventing the tool 7 from falling off the first support rod 105 and the second support rod 106 when subjected to tension.

[0037] Furthermore, such as Figure 1 As shown, the first support rod 105 is integrally formed with the fixing plate 104, and the second support rod 106 is integrally formed with the base 1, thereby increasing the connection strength between the first support rod 105 and the second support rod 106.

[0038] Furthermore, such as Figure 2 As shown, electromagnets 3 are provided on the bottom surface of the lifting bracket 201 and the upper surface of the fixing plate 104. When the lifting bracket 201 is placed above the tool 7, the two electromagnets 3 are energized to generate a strong attraction force on the tool 7, thereby clamping the tool 7 more stably.

[0039] like Figures 1-5 As shown in the figure, the testing method of the PCBN tool tensile strength testing device provided in this embodiment includes the following steps:

[0040] S1: First, bring the first support rod 105 close to the second support rod 106, and put the connecting hole on the tool 7 onto the first support rod 105 and the second support rod 106. Drive the lead screw 203 to rotate through the motor 202, so that the lifting bracket 201 is locked on the first support rod 105 and moves to the top of the tool 7 to limit the tool 7.

[0041] S2: Then the hydraulic rod 13 drives the pull rod 14 to move, so that the pressure plate 15 compresses the first spring 19 and abuts against the pressure sensor 16;

[0042] S3: At the moment the cutter 7 breaks, the moving seat 11 slides back and forth on the pull rod 14 under the action of inertia and the first spring 19, so that the first pressing part 6 generates a pressing force on the second pressing part 601. Under the action of the pressing force, the touch plate 102 compresses the second spring 103 and moves downward. The moving seat 11 drives the touch plate 102 to move to the end of the pressure plate 15 close to the pressure sensor 16. At this time, the second pressing part 601 releases the pressing force on the first pressing part 6. Under the action of the second spring 103, the touch plate 102 moves upward, so that the touch plate 102 is stuck between the pressure plate 15 and the inner wall of the mounting cavity 12. At this time, the conductive contact 18 is always in contact with the pressure plate 15, stopping the hydraulic rod 13 from continuing to move.

[0043] Furthermore, to further improve the accuracy of PCBN tool tensile testing, the tool 7 can be equilibrated at a temperature of 21°C-23°C and a relative humidity of 57%-63% for 24-48 hours before being tested again. The hardness of PCBN material can be affected by environmental conditions, especially temperature and humidity. By equilibrating the PCBN tool under specific temperature and humidity conditions, the influence of environmental factors on the hardness test results can be reduced, improving the accuracy and repeatability of the test results. PCBN tools exhibit thermal expansion and contraction at different temperatures, leading to the generation of temperature gradients between the inside and outside of the workpiece. These temperature gradients can affect the hardness test results. By equilibrating the workpiece at a specified temperature, the internal and external temperatures can be made consistent, eliminating the influence of temperature gradients on the hardness test results.

[0044] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0045] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.

[0046] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A PCBN tool tensile strength testing device, comprising a base (1) and a movable seat (11) disposed on the base (1), characterized in that: The movable seat (11) has an installation cavity (12) inside. A hydraulic rod (13) is fixedly connected to one side of the base (1). A pull rod (14) extending into the installation cavity (12) and slidably connected to the movable seat (11) is fixedly connected to the movable end of the hydraulic rod (13). A pressure plate (15) is fixedly connected to one end of the pull rod (14) inside the installation cavity (12). A pressure sensor (16) is provided on one side of the inner wall of the installation cavity (12). A contact plate (17) is fixedly connected to the inner wall of the installation cavity (12) away from the pressure sensor (16). A conductive contact (18) is connected to the side of the contact plate (17) close to the pressure sensor (16). A first spring (19) is connected between the pressure plate (15) and the inner wall of the installation cavity (12) with the pressure sensor (16). An anti-rebound assembly is provided inside the installation cavity (12) to prevent the movable seat (11) from rebounding. The anti-rebound assembly includes two movable cavities (101) opened on the bottom inner wall of the mounting cavity (12) and a touch plate (102) slidably connected inside the movable cavity (101). A second spring (103) is connected between the bottom end of the touch plate (102) and the bottom inner wall of the movable cavity (101). A fixed plate (104) is connected to one side of the movable seat (11). A first support rod (105) is provided on the fixed plate (104). A second support rod (106) parallel to the first support rod (105) is connected to one end of the base (1) near the first support rod (105). A limiting groove (2) is provided on the movable seat (11). A lifting seat (201) is slidably connected inside the limiting groove (2). A motor (202) is fixedly connected to the upper end of the movable seat (11). The output end of the motor (202) is connected to... A lead screw (203) is rotatably connected to the inner wall of the bottom of the limiting slide groove (2). The lead screw (203) passes through the lifting seat (201) and is threadedly connected to the lifting seat (201). Electromagnets (3) are provided on the bottom end face of the lifting seat (201) and the upper end face of the fixing plate (104). A first pressing part (6) is provided on the upper end of the touch plate (102). A second pressing part (601) corresponding to the first pressing part (6) is provided on the bottom side of the pressure plate (15) opposite to the touch plate (102).

2. The PCBN tool tensile strength testing device according to claim 1, characterized in that: The first support rod (105) is integrally formed with the fixed plate (104), and the second support rod (106) is integrally formed with the base (1).

3. The PCBN tool tensile strength testing device according to claim 2, characterized in that: Each of the two touch panels (102) is connected to a connecting rod (4) on its opposite side, and the two connecting rods (4) are fixedly connected to a grip rod (401) at one end extending to the outside of the movable seat (11).

4. The PCBN tool tensile strength testing device according to claim 3, characterized in that: When the pressure plate (15) is attached to the pressure sensor (16), the distance between the side wall of the pressure plate (15) near the pressure sensor (16) and the inner wall of the mounting cavity (12) is equal to the thickness of the contact plate (102).

5. The PCBN tool tensile strength testing device according to claim 4, characterized in that: The base (1) is provided with a sliding rail (5), and the movable seat (11) is slidably connected to the base (1) through the sliding rail (5).

6. A test method for the PCBN tool tensile strength testing device as described in claim 5, characterized in that: Includes the following steps: S1: First, bring the first support rod (105) close to the second support rod (106), and put the connecting hole on the tool (7) onto the first support rod (105) and the second support rod (106). Drive the lead screw (203) to rotate through the motor (202), so that the lifting bracket (201) is locked on the first support rod (105) and moves to the top of the tool (7) to limit the tool (7); S2: Then the hydraulic rod (13) drives the pull rod (14) to move, so that the pressure plate (15) compresses the first spring (19) and comes into contact with the pressure sensor (16); S3: At the moment the tool (7) breaks, the moving seat (11) slides back and forth on the pull rod (14) under the action of inertia and the first spring (19), so that the first extrusion part (6) generates extrusion force on the second extrusion part (601). Under the action of the extrusion force, the touch plate (102) compresses the second spring (103) and moves downward. The moving seat (11) drives the touch plate (102) to move to the end of the pressure plate (15) close to the pressure sensor (16). At this time, the second extrusion part (601) releases the extrusion force on the first extrusion part (6). Under the action of the second spring (103), the touch plate (102) moves upward, so that the touch plate (102) is stuck between the pressure plate (15) and the inner wall of the mounting cavity (12). At this time, the conductive contact (18) always abuts against the pressure plate (15) and stops the hydraulic rod (13) from continuing to move.

7. The test method of the PCBN tool tensile strength testing device according to claim 6, characterized in that: To further improve the accuracy of the PCBN tool tensile strength test, the tool (7) was placed under the conditions of 21-23°C temperature and 57%-63% relative humidity for 24-48 hours to equilibrate before being tested again.

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