A metal plate strength detection device

Abstract

The application relates to a metal plate strength detection device, belonging to the technical field of metal plate strength detection, which comprises a detection table, a detection base plate is fixedly installed at the center of the top surface of the detection table, protective shells are fixedly installed on the left and right sides of the detection base plate on the top surface of the detection table, mounting racks are fixedly and jointly installed on the opposite surfaces of the two protective shells on the top surface of the detection table, hydraulic top cylinders are fixedly installed at the rear side in the mounting racks, unfolding assemblies are arranged on the left and right sides of the output shafts of the hydraulic top cylinders, and connecting vertical plates are fixedly installed on the left and right sides of the mounting racks. The application can polish and clean the surface of a detection area before detection, avoids the phenomenon that uneven stress distribution in the extrusion process and false yielding are caused by surface defects of the metal plate, avoids the problem that the detection value is lower than the actual value, and after detection, the device can repair the dents generated in the detection process, thereby avoiding the secondary repair cost of the metal plate.

Description

Technical Field

[0002] This invention relates to the field of metal plate strength testing technology, specifically to a metal plate strength testing device. Background Technology

[0003] Metal plate strength testing is a general term for experimental methods used to evaluate the ability of metal plates to resist deformation and fracture under stress. It mainly uses physical force to compress and observe the changes on the surface to determine the test results. Therefore, metal plate strength testing is also a common physical analysis.

[0004] During the metal plate strength testing process, issues such as oil stains, dust, and oxide scale may occur on the surface of the metal plate being tested due to processing, storage, and transportation. These impurities may affect the accuracy of the metal plate strength test. Furthermore, after the metal plate is processed, indentations will appear on its surface. The general treatment for these indentations is secondary polishing. Therefore, conventional metal plate strength testing devices cannot avoid the problem of impurities on the metal plate surface affecting the accuracy of the test. In addition, traditional testing devices cannot handle the indentations that appear on the metal plate after testing.

[0005] To address the aforementioned issues, we propose a metal plate strength testing device. Summary of the Invention

[0006] To achieve the above objectives, the present invention provides the following technical solution: a metal plate strength testing device, comprising a testing platform, a testing pad fixedly installed at the center of the top surface of the testing platform, and protective shells fixedly installed on both the left and right sides of the top surface of the testing platform located on the testing pad. A mounting frame is fixedly installed on the opposite sides of the two protective shells on the top surface of the testing platform. A hydraulic cylinder is fixedly installed on the rear side inside the mounting frame. An unfolding assembly is provided on both the left and right sides of the output shaft of the hydraulic cylinder. A connecting longitudinal plate is fixedly installed on both the left and right sides of the mounting frame. A guide assembly for limiting the unfolding assembly is provided on the opposite sides of the two connecting longitudinal plates. A testing end rod is fixedly installed at the output end of the hydraulic cylinder. The guide assembly includes two connecting blocks fixedly installed on the surface of the connecting longitudinal plate. Guide bends are fixedly installed on the side of each connecting block near the hydraulic jack cylinder, and stop blocks are fixedly installed at both the upper and lower ends of the two guide bends.

[0007] Furthermore, the unfolding assembly includes two rotating blocks fixedly installed on the surface of the hydraulic top cylinder output shaft, and a semi-circular shell is rotatably installed between the two rotating blocks. A rotary spring is fixedly installed between the surface of the semi-circular shell and the surfaces of the two rotating blocks. The inner wall of the semi-circular shell is provided with a telescopic assembly. A pressing rod is fixedly installed on the side of the semi-circular shell away from the detection end rod, and the surface of the pressing rod is in close contact with the surface of the guide bend.

[0008] Furthermore, the telescopic assembly includes a semicircular block slidably mounted on the inner wall of the semicircular shell, and a telescopic semicircular cylinder is fixedly mounted on the bottom surface of the semicircular block. Several damping springs are fixedly mounted on the upper side of the inner wall of the semicircular shell, and magnetic attraction drive components and magnetic attraction execution components are respectively provided on the lower sides of the two corresponding telescopic semicircular cylinders on opposite sides. One of the telescopic semi-cylinders has a polishing nozzle fixedly installed on its surface. The other telescopic semi-cylinder has a trapezoidal groove on its bottom surface, and a trapezoidal ring is slidably installed on the inner wall of the trapezoidal groove. A polishing component is provided on the upper side of the trapezoidal groove. A storage box is fixedly installed inside the left protective shell. A pump chamber is provided on the lower side of the inside of the storage box, and a delivery pump is fixedly installed on the lower side of the inner wall of the pump chamber.

[0009] Furthermore, the polishing assembly includes an output groove formed on the top surface of the trapezoidal groove, an output motor embedded in the inner wall of the output groove, a transmission gear fixedly installed at the output end of the output motor, a plurality of connecting teeth embedded in the top surface of the trapezoidal ring, and a polishing wheel fixedly installed on the bottom surface of the trapezoidal ring.

[0010] Furthermore, several connecting teeth are arranged in a circular array on the top surface of the trapezoidal ring, and the surface of the transmission gear is in contact with the corresponding connecting teeth. The output end of the output motor is rotatably connected to the inner wall of the output slot.

[0011] Furthermore, the top surface of the polishing wheel is fitted with a cleaning shell for cleaning the detection rod, and the top surface of the cleaning shell is concave to fit the end of the detection rod. A sponge pad is fixedly installed on the top of the cleaning shell, and two cotton strips are fixedly installed on the surface of the sponge pad, with the lower ends of the two cotton strips extending through into the interior of the cleaning shell.

[0012] Furthermore, the guide bend includes a closed vertical section, an expanded bend section, and an expanded horizontal section, which are arranged sequentially from top to bottom.

[0013] Furthermore, the bottom surface of the telescopic semi-cylinder extends through to the bottom surface of the semi-circular shell, the output ends of several damping springs are fixedly connected to the top surface of the semi-circular block, the input end of the delivery pump extends through to the lower side inside the storage tank, and the output end of the delivery pump is fixedly connected to the upper end of the polishing nozzle.

[0014] Furthermore, a liquid addition vertical pipe is fixedly installed on the top surface of the storage tank, and a liquid addition inclined pipe is fixedly installed on one side of the surface of the cleaning shell.

[0015] Furthermore, the polishing wheel includes a fixed plate and a polishing wheel head, the polishing wheel head being detachably mounted on the end face of the fixed plate, and the polishing wheel head being replaceable according to the polishing precision requirements.

[0016] Compared with the prior art, the present invention provides a metal plate strength testing device, which has the following beneficial effects: 1. The device can polish and clean the surface of the test area before testing, so as to avoid uneven stress distribution and false yielding caused by defects on the surface of the metal plate during the extrusion process. This avoids the problem of the test value being lower than the actual value. In addition, the device can repair the dents generated during the testing process after the test, avoiding the cost of secondary repair of the metal plate.

[0017] 2. The surface of the telescopic semi-cylinder in this device is stepped, which can ensure its own telescopic characteristics, reduce the overall manufacturing cost, and avoid the waste of excess materials. The elastic compression of the damping spring, together with the polishing wheel, can clean the metal plate before inspection and also ensure the repair of the dents on the metal plate after inspection.

[0018] 3. This device utilizes a trapezoidal ring to not only enable the polishing wheel to rotate, but also to ensure that the polishing wheel will not fall off while rotating, thus guaranteeing the stability of the polishing wheel in use.

[0019] 4. The device utilizes cotton strips to come into contact with a sponge pad soaked in cleaning ethanol, thereby absorbing and conducting the liquid and keeping the sponge pad moist. Attached Figure Description

[0020] Figure 1 This is a perspective view of the entire invention; Figure 2 This is a cross-sectional perspective view of the entire invention; Figure 3 This is a perspective view of the hydraulic jacking cylinder of the present invention; Figure 4 for Figure 3 Enlarged structural diagram of section A in the middle; Figure 5 This is a perspective view of the semi-circular shell of the present invention; Figure 6 This is a vertical sectional perspective view of the semi-circular shell of the present invention; Figure 7 for Figure 6 Enlarged structural diagram of section B; Figure 8 This is a vertical sectional perspective view of the trapezoidal ring of the present invention; Figure 9 for Figure 8 Enlarged structural diagram of section C.

[0021] In the diagram: 1. Testing platform; 2. Testing pad; 3. Protective housing; 4. Mounting bracket; 5. Hydraulic jacking cylinder; 6. Unfolding assembly; 601. Rotating block; 602. Semi-circular shell; 603. Rotary spring; 604. Extrusion rod; 7. Connect the longitudinal plates; 8. Guide assembly; 801. Connecting block; 802. Guide bend; 8021. Closed vertical section; 8022. Unfolding bend; 8023. Unfolding horizontal section; 803. Stop block; 9. Telescopic assembly; 901. Semicircular block; 902. Telescopic semicircular cylinder; 903. Damping spring; 904. Magnetic drive component; 905. Magnetic actuation component; 906. Polishing nozzle; 907. Trapezoidal groove; 908. Trapezoidal ring; 909. Storage tank; 910. Pump chamber; 911. Delivery pump; 10. Polishing assembly; 1001. Output slot; 1002. Output motor; 1003. Transmission gear; 1004. Connecting gear; 1005. Polishing wheel; 11. Detection end rod; 12. Cleaning shell; 13. Sponge pad; 14. Cotton swab; 15. Liquid filling vertical tube; 16. Liquid filling inclined tube. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 9 The metal plate strength testing device in this embodiment includes a testing platform 1. A testing pad 2 is fixedly installed at the center of the top surface of the testing platform 1. Protective shells 3 are fixedly installed on both the left and right sides of the top surface of the testing platform 1 on the testing pad 2. A mounting frame 4 is fixedly installed on the opposite sides of the two protective shells 3 on the top surface of the testing platform 1. A hydraulic cylinder 5 is fixedly installed on the rear side inside the mounting frame 4. An unfolding component 6 is provided on both the left and right sides of the output shaft of the hydraulic cylinder 5. A connecting longitudinal plate 7 is fixedly installed on both the left and right sides of the mounting frame 4. A guide component 8 for limiting the unfolding component 6 is provided on the opposite sides of the two connecting longitudinal plates 7. A testing end rod 11 is fixedly installed at the output end of the hydraulic cylinder 5. The guide assembly 8 includes two connecting blocks 801 fixedly installed on the surface of the connecting longitudinal plate 7. Guide bends 802 are fixedly installed on the side of the two connecting blocks 801 near the hydraulic cylinder 5. Stops 803 are fixedly installed at both the upper and lower ends of the two guide bends 802. The guide bends 802 include a closed vertical section 8021, an unfolded bend section 8022, and an unfolded horizontal section 8023, and the unfolded bend section 8022, the closed vertical section 8021, and the unfolded horizontal section 8023 are arranged sequentially from top to bottom.

[0024] The unfolding component 6 includes two rotating blocks 601 fixedly installed on the surface of the output shaft of the hydraulic top cylinder 5, and a semi-circular shell 602 is rotatably installed between the two rotating blocks 601. A rotary spring 603 is fixedly installed between the surface of the semi-circular shell 602 and the surfaces of the two rotating blocks 601. The inner wall of the semi-circular shell 602 is provided with a telescopic component 9. A pressing rod 604 is fixedly installed on the side of the semi-circular shell 602 away from the detection end rod 11, and the surface of the pressing rod 604 is in close contact with the surface of the guide bend 802.

[0025] The telescopic component 9 includes a semi-circular block 901 that is slidably installed on the inner wall of the semi-circular shell 602, and a telescopic semi-circular cylinder 902 is fixedly installed on the bottom surface of the semi-circular block 901. Several damping springs 903 are fixedly installed on the upper side of the inner wall of the semi-circular shell 602. Magnetic drive component 904 and magnetic actuation component 905 are respectively provided on the lower sides of the two corresponding telescopic semi-circular cylinders 902 on opposite sides. In this application, the magnetic drive component 904 is a common permanent magnet and the magnetic actuation component 905 is a common reed switch. When the semi-circular shell 602 is combined, the reed switch contacts close. This closing signal is transmitted to a control module, which then sends a start signal to the power supply circuit of the output motor 1002 and the delivery pump 911 to start them working. This working principle is a mature existing technology and will not be described in detail in this application. One of the telescopic semi-cylinders 902 has a polishing nozzle 906 fixedly installed on its surface. The bottom surface of the other telescopic semi-cylinder 902 has a trapezoidal groove 907, and a trapezoidal ring 908 is slidably installed on the inner wall of the trapezoidal groove 907. A polishing component 10 is provided on the upper side of the trapezoidal groove 907. A storage box 909 is fixedly installed inside the left protective shell 3. A pump chamber 910 is provided on the lower side of the inside of the storage box 909, and a delivery pump 911 is fixedly installed on the lower side of the inner wall of the pump chamber 910. The bottom surface of the telescopic semi-cylindrical cylinder 902 extends through to the bottom surface of the semi-cylindrical shell 602. The output ends of several damping springs 903 are fixedly connected to the top surface of the semi-cylindrical block 901. The input end of the delivery pump 911 extends through to the lower side inside the storage tank 909, while the output end of the delivery pump 911 is fixedly connected to the upper end of the polishing nozzle 906. A liquid filling vertical pipe 15 is fixedly installed on the top surface of the storage tank 909, and a liquid filling inclined pipe 16 is fixedly installed on one side of the surface of the cleaning shell 12.

[0026] The polishing assembly 10 includes an output groove 1001 formed on the top surface of a trapezoidal groove 907. An output motor 1002 is embedded in the inner wall of the output groove 1001, and a transmission gear 1003 is fixedly installed at the output end of the output motor 1002. A plurality of connecting teeth 1004 are embedded in the top surface of a trapezoidal ring 908, and a polishing wheel 1005 is fixedly installed on the bottom surface of the trapezoidal ring 908. The polishing wheel 1005 includes a fixing plate and a polishing wheel head. The polishing wheel head is detachably installed on the end face of the fixing plate, and the polishing wheel head can be replaced according to the polishing precision requirements. A plurality of connecting teeth 1004 are arranged in a circular array on the top surface of the trapezoidal ring 908, and the surface of the transmission gear 1003 contacts the corresponding connecting teeth 1004. The output end of the output motor 1002 is rotatably connected to the inner wall of the output groove 1001. The top surface of the polishing wheel 1005 is snapped with a cleaning shell 12 for cleaning the detection rod 11, and the top surface of the cleaning shell 12 is concave to fit the end of the detection rod 11. A sponge pad 13 is fixedly installed on the top of the cleaning shell 12, and two cotton strips 14 are fixedly installed on the surface of the sponge pad 13. The lower ends of the two cotton strips 14 extend through into the interior of the cleaning shell 12. The pressure sensor integrated on the detection rod 11 transmits the real-time pressure signal to the data acquisition unit located inside the protective shell 3. After processing, the signal is displayed on the display screen on the surface of the protective shell 3. This is a mature existing technology.

[0027] The working principle of the above embodiments is as follows: Before the device is used, the output shaft of the hydraulic top cylinder 5 is in the retracted position, which drives the detection end rod 11 to the highest position to avoid affecting the placement of the metal plate. The protective shell 3 on the right side of the device is equipped with an oil supply structure to ensure the normal use effect of the hydraulic top cylinder 5. Since it is a mature existing technology, this application will not elaborate further. Under the elastic action of the rotary spring 603, the unfolding component 6 of the device is tightly attached to the surface of the wire bend 802 by the extrusion rod 604 and is in an unfolded state. Before the metal plate is detected, cleaning ethanol is added to the cleaning shell 12 through the liquid addition inclined pipe 16 to ensure the cleanliness of the surface of the inspection end rod 11. Polishing liquid is also added to the storage tank 909 through the liquid addition vertical pipe 15 to ensure the polishing effect on the surface of the metal plate. When performing strength testing on a metal plate, the metal plate to be tested is placed on the test pad 2, and the hydraulic top cylinder 5 is started. Its output shaft drives the test end rod 11 to move directly downward, applying pressure to the metal plate for strength testing. When the hydraulic top cylinder 5 runs from top to bottom, the extrusion rod 604 will pass through the unfolding curved section 8022, the closed vertical section 8021, and the unfolding horizontal section 8023 in sequence. When the hydraulic top cylinder 5 starts to move, the extrusion rod 604, under the bending action of the unfolding bend 8022, will overcome the rotational force of the rotary spring 603, causing the two semi-circular shells 602 to tend to merge. When the two semi-circular shells 602 are completely merged, the extrusion rod 604 also moves to the position of the closed vertical section 8021. When the hydraulic top cylinder 5 moves to the closed vertical section 8021, the two semi-circular shells 602 tend to merge. In this way, the magnetic suction actuator 905 and the magnetic suction drive 904 will magnetically adhere to each other. When the two sets of magnetic suction actuators 905 and magnetic suction drive 904 adhere to each other, the output motor 1002 and the delivery pump 911 will be started. This ensures that after the two semi-circular shells 602 adhere to each other, the polishing wheel 1005 rotates and polishes and cleans the detection area of ​​the metal plate, ensuring the accuracy of the detection. This is because the output motor 1002 drives the trapezoidal ring 908 connected by the connecting teeth 1004 through the transmission gear 1003, which in turn drives the polishing wheel 1005 to rotate. At the same time as the polishing wheel 1005 rotates, the delivery pump 911 can spray the polishing liquid in the storage tank 909 onto the surface of the polishing wheel 1005 through the polishing nozzle 906, so that the polishing can proceed smoothly. When the hydraulic top cylinder 5 moves to the horizontal section 8023, under the rotational force of the rotary spring 603, the extrusion rod 604 will be fully opened at the horizontal position of the horizontal section 8023, thus ensuring the contact between the detection end rod 11 and the metal plate and performing extrusion testing. The protective shell 3 on the right side is equipped with instruments such as pressure gauges, which can detect the surface strength of the metal plate and complete the metal plate testing process. When the hydraulic top cylinder 5 is in the closed vertical section 8021 position, it will press downwards. At this time, the telescopic component 9 will have a telescopic effect. At this time, the lower end of the detection rod 11 will extend into the concave surface of the cleaning shell 12 and come into contact with the sponge pad 13 soaked in cleaning ethanol to achieve rotational wiping cleaning. The cotton strip 14 plays the role of absorbing and conducting liquid to keep the sponge pad 13 moist. After the metal plate strength test is completed, the output shaft of the hydraulic top cylinder 5 begins to retract, and the semi-circular shell 602 will move in the opposite direction to the above-mentioned running direction, from the unfolded horizontal section 8023 to the closed vertical section 8021, so as to contact and polish the metal plate test position, thereby polishing away the dents in the test process and avoiding the secondary processing cost of the operator. After the device is reset, the tested metal plate is removed, thus ensuring the processing of the next metal plate.

[0028] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

Claims

1. A metal plate strength testing device, comprising a testing table (1), characterized in that: A test pad (2) is fixedly installed at the center of the top surface of the test platform (1), and protective shells (3) are fixedly installed on both the left and right sides of the test pad (2) on the top surface of the test platform (1). A mounting frame (4) is fixedly installed on the opposite sides of the two protective shells (3) on the top surface of the test platform (1). A hydraulic cylinder (5) is fixedly installed on the rear side inside the mounting frame (4). An unfolding component (6) is provided on both the left and right sides of the output shaft of the hydraulic cylinder (5), and a connecting longitudinal plate (7) is fixedly installed on both the left and right sides of the mounting frame (4). A guide component (8) for limiting the unfolding component (6) is provided on the opposite sides of the two connecting longitudinal plates (7). A test end rod (11) is fixedly installed at the output end of the hydraulic cylinder (5). The guide assembly (8) includes two connecting blocks (801) fixedly installed on the surface of the connecting longitudinal plate (7). Guide bends (802) are fixedly installed on the side of the two connecting blocks (801) near the hydraulic top cylinder (5), and stop blocks (803) are fixedly installed at both the upper and lower ends of the two guide bends (802).

2. The metal plate strength testing device according to claim 1, characterized in that: The unfolding assembly (6) includes two rotating blocks (601) fixedly installed on the surface of the output shaft of the hydraulic top cylinder (5), and a semi-circular shell (602) is rotatably installed between the two rotating blocks (601). A rotary spring (603) is fixedly installed between the surface of the semi-circular shell (602) and the surface of the two rotating blocks (601). The inner wall of the semi-circular shell (602) is provided with a telescopic assembly (9). A pressing rod (604) is fixedly installed on the side of the semi-circular shell (602) away from the detection end rod (11), and the surface of the pressing rod (604) is in close contact with the surface of the guide bend (802).

3. The metal plate strength testing device according to claim 2, characterized in that: The telescopic assembly (9) includes a semi-circular block (901) that is slidably installed on the inner wall of the semi-circular shell (602), and a telescopic semi-circular cylinder (902) is fixedly installed on the bottom surface of the semi-circular block (901). Several damping springs (903) are fixedly installed on the upper side of the inner wall of the semi-circular shell (602). Magnetic drive components (904) and magnetic actuation components (905) are respectively provided on the lower sides of the two corresponding telescopic semi-circular cylinders (902) on opposite sides. One of the telescopic semi-cylinders (902) has a polishing nozzle (906) fixedly installed on its surface. The other telescopic semi-cylinder (902) has a trapezoidal groove (907) on its bottom surface, and a trapezoidal ring (908) is slidably installed on the inner wall of the trapezoidal groove (907). A polishing component (10) is provided on the upper side of the trapezoidal groove (907). A storage box (909) is fixedly installed inside the left protective shell (3). A pump chamber (910) is provided on the lower side of the inside of the storage box (909), and a delivery pump (911) is fixedly installed on the lower side of the inner wall of the pump chamber (910).

4. The metal plate strength testing device according to claim 3, characterized in that: The polishing assembly (10) includes an output groove (1001) formed on the top surface of a trapezoidal groove (907). An output motor (1002) is embedded in the inner wall of the output groove (1001), and a transmission gear (1003) is fixedly installed at the output end of the output motor (1002). Several connecting teeth (1004) are embedded in the top surface of the trapezoidal ring (908), and a polishing wheel (1005) is fixedly installed on the bottom surface of the trapezoidal ring (908).

5. The metal plate strength testing device according to claim 4, characterized in that: A number of connecting teeth (1004) are arranged in a circular array on the top surface of the trapezoidal ring (908), and the surface of the transmission gear (1003) is in contact with the corresponding connecting teeth (1004). The output end of the output motor (1002) is rotatably connected to the inner wall of the output groove (1001).

6. The metal plate strength testing device according to claim 4, characterized in that: The top surface of the polishing wheel (1005) is fitted with a cleaning shell (12) for cleaning the detection rod (11), and the top surface of the cleaning shell (12) is concave to fit the end of the detection rod (11). A sponge pad (13) is fixedly installed on the top of the cleaning shell (12), and two cotton strips (14) are fixedly installed on the surface of the sponge pad (13), with the lower ends of the two cotton strips (14) extending through into the interior of the cleaning shell (12).

7. The metal plate strength testing device according to claim 2, characterized in that: The guide bend (802) includes a closed vertical section (8021), an unfolded bend (8022), and an unfolded horizontal section (8023), and the unfolded bend (8022), the closed vertical section (8021), and the unfolded horizontal section (8023) are arranged sequentially from top to bottom.

8. The metal plate strength testing device according to claim 3, characterized in that: The bottom surface of the telescopic semi-cylindrical tube (902) extends through to the bottom surface of the semi-cylindrical shell (602), the output ends of several damping springs (903) are fixedly connected to the top surface of the semi-cylindrical block (901), the input end of the delivery pump (911) extends through to the lower side inside the storage tank (909), and the output end of the delivery pump (911) is fixedly connected to the upper end of the polishing nozzle (906).

9. A metal plate strength testing device according to claim 6, characterized in that: A liquid addition vertical pipe (15) is fixedly installed on the top surface of the storage tank (909), and a liquid addition inclined pipe (16) is fixedly installed on one side of the surface of the cleaning shell (12).

10. A metal plate strength testing device according to claim 4, characterized in that: The polishing wheel (1005) includes a fixed plate and a polishing wheel head. The polishing wheel head is detachably mounted on the end face of the fixed plate, and the polishing wheel head can be replaced according to the polishing precision requirements.

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