Flat-pack positioning fixture for periphery grinding of equilateral triangle cutting insert
By designing a flat-mounted positioning fixture, and utilizing a combination of a tool mounting base, positioning pin, positioning cylinder, and push plate, high-precision positioning of the equilateral triangular cutting insert is achieved. This reduces the contact area and grinding friction, solves the problems of high cost and low efficiency caused by traditional positioning fixtures, and improves grinding efficiency and equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU FENGYI YINHU CNC TOOL CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional vertical positioning fixtures, when used for grinding equilateral triangular cutting inserts, have a large contact area, resulting in high grinding friction. This requires high-rigidity equipment, increases production costs, reduces grinding efficiency, and is prone to equipment damage.
Design a flat-mounted positioning fixture, including a tool mounting base, a positioning pin, a positioning cylinder, a positioning push plate, and a pressure plate. The positioning pin achieves center positioning, the positioning cylinder and push plate achieve circumferential positioning, and the pressure plate achieves vertical positioning, thereby reducing the contact area and grinding friction.
It achieves high-precision and reliable positioning and installation, reduces the rigidity requirements of machine tools and grinding wheels, reduces equipment costs, improves grinding efficiency, and avoids equipment damage.
Smart Images
Figure CN224488755U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a positioning fixture for grinding cutting inserts, and more particularly to a flat positioning fixture for grinding the periphery of an equilateral triangular cutting insert. Background Technology
[0002] An equilateral triangular cutting insert is a type of insert shaped like an equilateral triangle, such as... Figure 1 and Figure 2 As shown, a typical equilateral triangular cutting insert 1 has three peripheral surfaces 2 that are all planes, with an included angle of 60° between any two peripheral surfaces 2. A mounting hole 3 is provided at the center of the insert. Part or all (most of the hole in the figure) of the mounting hole 3 has a conical surface. The mounting hole 3 is used to connect to the tool holder.
[0003] For the aforementioned equilateral triangular cutting insert 1, after finishing the two large planes, it is necessary to use a grinding wheel to grind the three peripheral surfaces 2, such as... Figure 3 As shown, the grinding surface of grinding wheel 4 is annular. Before grinding, it needs to be positioned using a positioning fixture ( Figure 3 The equilateral triangular cutting insert 1 to be ground is mounted on the movable seat of the machine tool (not shown in the figure). After starting the machine tool, the grinding wheel 4 on the machine tool (the grinding wheel 4 can also be mounted next to the machine tool instead of on the machine tool) continues to rotate. The movable seat drives the equilateral triangular cutting insert 1 to move in the X-axis direction of the machine tool (the X-axis and Y-axis directions of the machine tool are both horizontal and perpendicular to each other, and the Z-axis direction of the machine tool is vertical, the same below) and gradually approach the grinding wheel 4. Figure 3 The equilateral triangular cutting insert 1 is located in front of the grinding wheel 4 in the Y-axis direction of the machine tool. When the corresponding peripheral surface 2 of the equilateral triangular cutting insert 1 comes into contact with the grinding surface of the grinding wheel 4, the grinding wheel 4 performs the grinding function on the corresponding peripheral surface 2 of the equilateral triangular cutting insert 1. After grinding one peripheral surface 2, the equilateral triangular cutting insert 1 is rotated 120° and fixed, and then another peripheral surface 2 is ground, until all three peripheral surfaces 2 are ground.
[0004] The conventional positioning fixture (not shown in the figure) used to install the above-mentioned equilateral triangular cutting insert 1 is a vertical structure, that is, the large plane direction of the installed equilateral triangular cutting insert 1 is vertical. When the grinding surface of the grinding wheel 4 contacts the corresponding peripheral surface 2 of the equilateral triangular cutting insert 1 and is at the maximum contact area S1, the grinding surface of the grinding wheel 4 can perform grinding operations on the peripheral surface 2 with the maximum area and the fastest speed.
[0005] While the traditional vertical positioning fixture described above can improve grinding efficiency due to its small total feed stroke, it has the following drawbacks: Because the maximum contact area S1 is large (almost half the size of the peripheral surface 2), the grinding friction on the grinding wheel 4 is significant. This places high demands on the rigidity of the machine tool's moving base, positioning fixture, and grinding wheel 4. In practical applications, using machine tools, positioning fixtures, and grinding wheels that meet rigidity requirements results in higher equipment prices. If other processing steps do not require high performance, this leads to wasted functionality and increased production costs. Furthermore, the rotational speed of the grinding wheel 4 and the feed speed of the moving base are reduced due to excessive friction, thus decreasing grinding efficiency. If lower-priced equipment and components are used, frequent damage occurs, requiring downtime during production to replace parts, leading to increased costs and reduced efficiency. Utility Model Content
[0006] The purpose of this invention is to provide a flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert, which can significantly reduce the contact area and grinding friction, in order to solve the above-mentioned problems.
[0007] This utility model achieves the above objectives through the following technical solutions:
[0008] A flat-mounted positioning fixture for peripheral grinding of an equilateral triangular cutting insert includes a tool mounting base, a positioning pin, positioning cylinders, positioning push plates, and a pressure plate. The tool mounting base has a flat surface with a vertical positioning hole. The vertical positioning pin is placed in the positioning hole, and the upper part of the positioning pin is located above the tool mounting base and is used to mate with the mounting hole of the equilateral triangular cutting insert. The pressure plate is located directly above the positioning pin. The center lines of the push rods of the two positioning cylinders are both horizontal, and the included angle between the center lines of the push rods of the two positioning cylinders is 120°. The push rods of the two positioning cylinders are respectively connected to the two positioning push plates, which are respectively located above the tool mounting base and close to the positioning pin.
[0009] Preferably, in order to reduce the contact area between the positioning push plate and the equilateral triangular cutting blade to be ground so as to achieve a more accurate positioning function for the equilateral triangular cutting blade to be ground, the positioning push plate has protrusions on both sides of the end face near the positioning pin, which are respectively provided in the direction of approaching the positioning pin. The end face of the protrusion near the positioning pin is flat and perpendicular to the center line of the push rod of the corresponding positioning cylinder.
[0010] Preferably, in order to improve the directional accuracy of the positioning push plate movement and achieve a more precise positioning function for the equilateral triangular cutting insert to be ground, each positioning push plate is provided with a positioning seat below it, and a positioning groove is provided on the top of the positioning seat. The two side walls of the positioning groove are parallel to each other and parallel to the center line of the push rod of the corresponding positioning cylinder. The positioning push plate is placed in the corresponding positioning groove, and the two sides of the positioning push plate are in contact with the two side walls of the corresponding positioning groove.
[0011] Preferably, in order to improve the center positioning accuracy of the equilateral triangular cutting insert to be ground and to match the conical hole wall of the mounting hole of the equilateral triangular cutting insert, the positioning hole is a blind hole with an open top, a vertical compression spring is provided in the positioning hole and the compression spring is located below the positioning pin, and the upper section of the positioning pin is a conical section that is smaller at the top and larger at the bottom.
[0012] Preferably, in order to achieve the purpose of quickly and reliably pressing the equilateral triangular cutting insert to be ground by means of a pressure plate, the flat positioning fixture for grinding the periphery of the equilateral triangular cutting insert further includes a pressure plate cylinder and a transmission rod. One end of the transmission rod is rotatably connected to the push rod of the pressure plate cylinder, the other end of the transmission rod is rotatably connected to the pressure plate, and the middle section of the transmission rod is rotatably connected to the support column.
[0013] Preferably, in order to facilitate the installation of this device on the moving seat of the machine tool, the center line of the push rod of the pressure plate cylinder is vertical and the upper end of the push rod is rotatably connected to one end of the transmission rod, and the support column is located on the top of the tool mounting seat.
[0014] Preferably, to avoid the problem that the bottom of the pressure plate cannot be in a horizontal position due to the connection structure error between the transmission rod and the pressure plate, the upper middle part of the pressure plate is provided with an upwardly protruding connecting boss, the connecting boss is rotatably connected to the corresponding end of the transmission rod, and a gap is left between the upper part of the pressure plate and the bottom of the corresponding end of the transmission rod.
[0015] The beneficial effects of this utility model are as follows:
[0016] This invention utilizes a design that integrates a tool mounting base, locating pins, locating cylinders, locating push plates, and pressure plates. The locating pins enable center positioning of the equilateral triangular cutting insert to be ground. The two locating cylinders and two locating push plates achieve circumferential positioning of the insert. The pressure plates provide vertical positioning. Ultimately, this design achieves highly reliable and precise horizontal positioning of the equilateral triangular cutting insert, ensuring reliable surface-to-surface contact between the insert and the grinding wheel during grinding for high-precision machining. Furthermore, because the large plane of the equilateral triangular cutting insert to be ground is transverse (i.e., horizontal), the contact area between the grinding surface of the grinding wheel and the corresponding peripheral surface of the equilateral triangular cutting insert is always the same and much smaller than the maximum contact area when using traditional positioning fixtures. The grinding friction is also significantly reduced. Therefore, the rigidity requirements of the machine tool's moving base, positioning fixture, and grinding wheel are significantly reduced, allowing the use of lower-priced equipment. Grinding is less prone to damage, significantly reducing production costs. Moreover, because the grinding friction is small, the rotational speed of the grinding wheel and the feed speed of the machine tool's moving base are not affected, thereby improving grinding efficiency. Attached Figure Description
[0017] Figure 1 This is a top view of a typical equilateral triangular cutting insert.
[0018] Figure 2 yes Figure 1 The AA section view in the diagram is also a schematic diagram of the front section view structure.
[0019] Figure 3 This is a schematic diagram of the structure in contact with the grinding surface of the grinding wheel when a traditional positioning fixture is used to install an equilateral triangular cutting insert for grinding.
[0020] Figure 4 This is a schematic diagram of the main structure of the tool mounting base, positioning pin, pressure plate cylinder, transmission rod and pressure plate of the flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert according to the present invention. The tool mounting base is shown as the main sectional view. The figure also shows the main sectional view of the equilateral triangular cutting insert to be ground and the grinding wheel.
[0021] Figure 5 This is a top view of the two positioning cylinders, two positioning push plates, and two positioning seats of the flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert as described in this utility model. The figure also shows the top view of the equilateral triangular cutting insert to be ground and the grinding wheel.
[0022] Figure 6This is one of the top view structural schematic diagrams of the flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert described in this utility model, used to correct the angular position of the equilateral triangular cutting insert to be ground;
[0023] Figure 7 This is the second top view of the flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert described in this utility model, used to correct the angular position of the equilateral triangular cutting insert to be ground.
[0024] Figure 8 This is a top view schematic diagram of the flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert described in this utility model, used to position and install an equilateral triangular cutting insert after grinding a peripheral surface.
[0025] Figure 9 This is a top view of the flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert, as described in this utility model, used to position and install the equilateral triangular cutting insert after grinding the two peripheral surfaces.
[0026] Figure 10 This is a schematic diagram of the structure of the flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert, as described in this utility model, which is in contact with the grinding surface of the grinding wheel during grinding. Detailed Implementation
[0027] The present invention will be further described below with reference to the accompanying drawings:
[0028] like Figure 4 and Figure 5 As shown, the flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert according to this utility model includes a tool mounting base 7, a positioning pin 10, a positioning cylinder 13, a positioning push plate 14, and a pressure plate 11. The upper surface of the tool mounting base 7 is flat and has a vertical positioning hole (not marked in the figure). The vertical positioning pin 10 is placed in the positioning hole. The upper part of the positioning pin 10 is located above the tool mounting base 7 and is used to cooperate with the mounting hole 3 of the equilateral triangular cutting insert 1. The pressure plate 11 is located directly above the positioning pin 10. The center lines of the push rods of the two positioning cylinders 13 (not marked in the figure) are both horizontal. The included angle between the center lines of the push rods of the two positioning cylinders 13 is 120°. The push rods of the two positioning cylinders 13 are respectively connected to the two positioning push plates 14. The two positioning push plates 14 are respectively located above the tool mounting base 7 and close to the positioning pin 10.
[0029] like Figure 4 and Figure 5 As shown, this utility model also discloses the following more optimized specific structures:
[0030] In order to reduce the contact area between the positioning push plate 14 and the equilateral triangular cutting blade 1 to be ground so as to achieve a more accurate positioning function for the equilateral triangular cutting blade 1 to be ground, the positioning push plate 14 has protrusions 16 on both sides of the end face near the positioning pin 10, which protrude towards the positioning pin 10. The end face of the protrusion 16 near the positioning pin 10 is flat and perpendicular to the center line of the push rod of the corresponding positioning cylinder 13.
[0031] To improve the directional accuracy of the positioning push plate 14 and achieve more precise positioning of the equilateral triangular cutting insert 1 to be ground, a positioning seat 15 is provided below each positioning push plate 14. A positioning groove (not marked in the figure) is provided on the top of the positioning seat 15. The two side walls of the positioning groove are parallel to each other and parallel to the center line of the push rod of the corresponding positioning cylinder 13. The positioning push plate 14 is placed in the corresponding positioning groove, and the two sides of the positioning push plate 14 are in contact with the two side walls of the corresponding positioning groove.
[0032] In order to improve the center positioning accuracy of the equilateral triangular cutting insert 1 to be ground and to match the conical hole wall of the mounting hole 3 of the equilateral triangular cutting insert 1, the positioning hole is a blind hole with an open top. A vertical compression spring 9 is provided in the positioning hole and the compression spring 9 is located below the positioning pin 10. The upper section of the positioning pin 10 is a conical section 12 that is smaller at the top and larger at the bottom.
[0033] In order to achieve the purpose of quickly and reliably pressing the equilateral triangular cutting insert 1 to be ground by the pressure plate 11, the flat positioning fixture for grinding the periphery of the equilateral triangular cutting insert also includes a pressure plate cylinder 5 and a transmission rod 6. One end of the transmission rod 6 is rotatably connected to the push rod (not marked in the figure) of the pressure plate cylinder 5, the other end of the transmission rod 6 is rotatably connected to the pressure plate 11, and the middle section of the transmission rod 6 is rotatably connected to the support column 8.
[0034] To facilitate the installation of this device on the moving seat of a machine tool (not shown in the figure), the center line of the push rod of the pressure plate cylinder 5 is vertical and the upper end of the push rod is rotatably connected to one end of the transmission rod 6. The support column 8 is located on top of the tool mounting seat 7.
[0035] To avoid the problem that the bottom of the pressure plate 11 cannot be in a horizontal position due to the connection structure error between the transmission rod 6 and the pressure plate 11, the upper middle part of the pressure plate 11 is provided with an upwardly protruding connecting boss (not marked in the figure). The connecting boss is rotatably connected to the corresponding end of the transmission rod 6, and a gap is left between the upper part of the pressure plate 11 and the bottom of the corresponding end of the transmission rod 6.
[0036] like Figures 4-9As shown, in application, this fixture is installed on a machine tool. The tool mounting base 7 can be an independent component, in which case the tool mounting base 7, the two positioning cylinders 13, and the pressure plate cylinder 5 are respectively installed on the moving base of the machine tool; alternatively, the moving base of the machine tool can be used as the tool mounting base 7, in which case the two positioning cylinders 13 and the pressure plate cylinder 5 are respectively installed on the tool mounting base 7. The feed direction of the moving base of the machine tool is the X-axis direction of the machine tool, the large plane of the equilateral triangular cutting insert 1 is horizontal, and the three peripheral surfaces 2 are vertical. When installing the equilateral triangular cutting insert 1 to be ground, firstly, the two positioning push plates 14 are moved away from the positioning pin 10 by the positioning cylinder 13, and the pressure plate 11 is moved away from the positioning pin 10 by the pressure plate cylinder 5. The equilateral triangular cutting insert 1 to be ground is then placed on top of the tool mounting base 7 from top to bottom, and the equilateral triangular cutting insert 1 is then placed on top of the tool mounting base 7. The mounting hole 3 of the blade 1 is aligned with the positioning pin 10, and their conical sections correspond to each other, achieving the center positioning of the equilateral triangular cutting blade 1. Then, the pressure plate 11 is moved downward by the pressure plate cylinder 5 and presses against the top of the equilateral triangular cutting blade 1 until the bottom of the equilateral triangular cutting blade 1 contacts the top surface of the tool mounting seat 7. At this time, the clamping force is small, achieving the initial vertical positioning of the equilateral triangular cutting blade 1. During this process, the pressure plate 11 adapts to the change of lateral inclination as the equilateral triangular cutting blade 1 moves, until it finally contacts the top surface of the equilateral triangular cutting blade 1 tightly. Then, one of the positioning cylinders 13 moves the corresponding positioning push plate towards the equilateral triangular cutting blade 1 until one of the protrusions 16 contacts a peripheral surface 2 of the equilateral triangular cutting blade 1. At this time, there are two possibilities, one is as follows: Figure 6 As shown, the actual angular position of the equilateral triangular cutting blade 1 differs from the correct angular position shown by the dotted line in a counterclockwise direction. After the positioning push plate 14 of one of the positioning cylinders 13 moves towards the equilateral triangular cutting blade 1, the first protrusion 16 of the two protrusions 16 on the positioning push plate 14 first contacts one peripheral surface 2 of the equilateral triangular cutting blade 1. The first protrusion 16 pushes the equilateral triangular cutting blade 1 to rotate clockwise around the center line of its mounting hole 3 until the second protrusion 16 of the two protrusions 16 on the positioning push plate 14 contacts and presses against the corresponding peripheral surface 2 of the equilateral triangular cutting blade 1. At this time, the function of preliminary circumferential positioning of the equilateral triangular cutting blade 1 by the positioning cylinder 13 is completed. Then, the other positioning cylinder 13 pushes the other positioning push plate 14 to press against the other peripheral surface 2 of the equilateral triangular cutting blade 1, thus completing the function of final circumferential positioning of the equilateral triangular cutting blade 1 by the two positioning cylinders 13; another... Figure 7As shown, the actual angular position of the equilateral triangular cutting blade 1 differs clockwise from the correct angular position shown by the dashed line. After the positioning push plate 14 of one of the positioning cylinders 13 moves towards the equilateral triangular cutting blade 1, the second protrusion 16 on the positioning push plate 14 first contacts a peripheral surface 2 of the equilateral triangular cutting blade 1. The second protrusion 16 pushes the equilateral triangular cutting blade 1 to rotate counterclockwise around the center line of its mounting hole 3 until the first protrusion 16 of the two protrusions 16 on the positioning push plate 14 contacts and presses against the corresponding peripheral surface 2 of the equilateral triangular cutting blade 1. At this point, the operation of the positioning cylinder 13 is completed. The function of initial circumferential positioning of the equilateral triangular cutting insert 1 is performed. Then, another positioning cylinder 13 pushes another positioning push plate 14 to press against the other peripheral surface 2 of the equilateral triangular cutting insert 1, thus completing the function of final circumferential positioning of the equilateral triangular cutting insert 1 by the two positioning cylinders 13. Then, the pressure plate cylinder 5 pushes the pressure plate 11 to press the equilateral triangular cutting insert 1 tightly, so that the bottom of the pressure plate 11 is in close surface contact with the top of the equilateral triangular cutting insert 1, and the bottom of the equilateral triangular cutting insert 1 is in close surface contact with the top of the mounting base 7. At this time, the pressing force is large, realizing the final vertical positioning of the equilateral triangular cutting insert 1. In this way, the final positioning and installation of the equilateral triangular cutting insert 1 is achieved. After installation, as shown... Figure 5 As shown, at this time, the peripheral surface 2 of the equilateral triangular cutting insert 1 to be machined is parallel to the X-axis direction of the machine tool and the angle between it and the center line of the push rod of any of the positioning cylinders 13 is 30°, and it is also parallel to the grinding surface of the grinding wheel 4. Note: In the above process, in order to prevent the positioning pin 10 from moving downward, a compression spring 9 with sufficient elasticity is required; for more accurate positioning, the two positioning push plates 14 can be selected to repeatedly contact the equilateral triangular cutting insert 1 to complete the circumferential positioning.
[0037] Then the program is started to grind the corresponding peripheral surface 2 of the equilateral triangular cutting insert 1. The grinding process is as follows: the grinding wheel 4 rotates continuously, and the moving seat of the machine tool drives the equilateral triangular cutting insert 1 to move in the X-axis direction of the machine tool and gradually approach the grinding wheel 4. When the corresponding peripheral surface 2 of the equilateral triangular cutting insert 1 comes into contact with the grinding surface of the grinding wheel 4, the grinding wheel 4 performs the grinding function on the corresponding peripheral surface 2 of the equilateral triangular cutting insert 1.
[0038] After grinding one peripheral surface 2 of the equilateral triangular cutting insert 1, reset all components, loosen the equilateral triangular cutting insert 1, and then rotate the equilateral triangular cutting insert 120°. Using the ground peripheral surface 2 as the preferred peripheral surface 2 for circumferential positioning, repeat the same positioning and installation process as above to achieve the final positioning and installation of the equilateral triangular cutting insert 1. Figure 8As shown, the second peripheral surface 2 of the equilateral triangular cutting insert 1 is then ground; then, the equilateral triangular cutting insert 1 is rotated 120°, and the two ground peripheral surfaces 2 are used to circumferentially position the equilateral triangular cutting insert 1. Following the same positioning and installation process as above, the final positioning and installation of the equilateral triangular cutting insert 1 is achieved again, as shown. Figure 9 As shown, the third peripheral surface 2 of the equilateral triangular cutting insert 1 is then ground, thus completing the entire grinding process of the three peripheral surfaces 2 of the equilateral triangular cutting insert 1. Since the positioning accuracy of the equilateral triangular cutting insert 1 can be achieved by mechanical components such as the positioning cylinder 13, positioning push plate 14, positioning seat 15, and positioning pin 10, the included angle between any two peripheral surfaces 2 of the three peripheral surfaces 2 of the equilateral triangular cutting insert 1 after grinding is 60°, which meets the accuracy requirements.
[0039] like Figure 10 As shown, when the equilateral triangular cutting insert 1 to be ground is installed in the flat-mounted positioning fixture for peripheral grinding of the equilateral triangular cutting insert described in this utility model and then ground, the maximum contact area S2 between the grinding surface of the grinding wheel 4 and the corresponding peripheral surface 2 of the equilateral triangular cutting insert 1 is compared with the maximum contact area S2 of the contact stroke. Figure 3 The maximum contact area S1 of the traditional positioning installation shown is much smaller, only about a quarter of the total area. The contact area during most of the grinding process is the maximum contact area S2.
[0040] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.
Claims
1. A flat-mounted positioning fixture for peripheral grinding of equilateral triangular cutting inserts, comprising a tool mounting base, characterized in that: It also includes a positioning pin, a positioning cylinder, a positioning push plate, and a pressure plate. The top of the tool mounting base is flat and has a vertical positioning hole. The vertical positioning pin is placed in the positioning hole. The upper part of the positioning pin is located above the tool mounting base and is used to cooperate with the mounting hole of the equilateral triangular cutting blade. The pressure plate is located directly above the positioning pin. The center lines of the push rods of the two positioning cylinders are both horizontal, and the included angle between the center lines of the push rods of the two positioning cylinders is 120°. The push rods of the two positioning cylinders are respectively connected to the two positioning push plates. The two positioning push plates are respectively located above the tool mounting base and close to the positioning pin.
2. The flat-mounted positioning fixture for peripheral grinding of an equilateral triangular cutting insert according to claim 1, characterized in that: The positioning push plate has protrusions on both sides of one end face near the positioning pin, which protrude towards the positioning pin. The end face of the protrusion near the positioning pin is flat and perpendicular to the center line of the push rod of the corresponding positioning cylinder.
3. The flat-mounted positioning fixture for peripheral grinding of an equilateral triangular cutting insert according to claim 2, characterized in that: Each of the positioning push plates is provided with a positioning seat below it, and a positioning groove is provided on the top of the positioning seat. The two side walls of the positioning groove are parallel to each other and parallel to the center line of the push rod of the corresponding positioning cylinder. The positioning push plate is placed in the corresponding positioning groove, and the two sides of the positioning push plate are in contact with the two side walls of the corresponding positioning groove.
4. The flat-mounted positioning fixture for peripheral grinding of equilateral triangular cutting inserts according to any one of claims 1-3, characterized in that: The positioning hole is a blind hole with an opening at the top. A vertical compression spring is provided inside the positioning hole and is located below the positioning pin. The upper section of the positioning pin is a conical section that is smaller at the top and larger at the bottom.
5. The flat-mounted positioning fixture for peripheral grinding of equilateral triangular cutting inserts according to any one of claims 1-3, characterized in that: The flat-mounted positioning fixture for grinding the periphery of an equilateral triangular cutting insert further includes a pressure plate cylinder and a transmission rod. One end of the transmission rod is rotatably connected to the push rod of the pressure plate cylinder, the other end of the transmission rod is rotatably connected to the pressure plate, and the middle section of the transmission rod is rotatably connected to a support column.
6. The flat-mounted positioning fixture for peripheral grinding of an equilateral triangular cutting insert according to claim 5, characterized in that: The centerline of the push rod of the pressure plate cylinder is vertical, and the upper end of the push rod is rotatably connected to one end of the transmission rod. The support column is located on top of the tool mounting seat.
7. The flat-mounted positioning fixture for peripheral grinding of an equilateral triangular cutting insert according to claim 5, characterized in that: The pressure plate has an upwardly protruding connecting boss at the center of its upper part. The connecting boss is rotatably connected to the corresponding end of the transmission rod. A gap is left between the upper part of the pressure plate and the lower part of the corresponding end of the transmission rod.