A valve seat sealing interface machining tool assembly

Abstract

A valve seat sealing interface processing tool assembly is used to process the sealing interface of the valve seat, comprising a tool and a tool head positioning seat. The tool and the tool head positioning seat are respectively arranged on both sides of the valve seat, that is, the tool is fixed on the tool seat of a CNC machine tool, the tool head positioning seat and the workpiece are respectively fixed in a workpiece fixture, and the tool head positioning seat is located on the inner side of the workpiece. When processing the valve seat, the end of the tool abuts against the tool head positioning seat. The tool is used to process the valve seat, and the tool head positioning seat is used to position and support the end of the tool to prevent the tool from swinging, thereby ensuring the processing accuracy of the valve seat and improving the yield rate of the valve seat.

Description

Technical Field

[0001] The invention belongs to the technical field of numerically controlled machine tools, and in particular relates to a valve seat sealing interface machining tool assembly. Background Art

[0002] CNC machine tools are digitally controlled machine tools, which are automated machine tools equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, express them in coded numbers, and input them into the CNC device through information carriers. After calculation and processing, the CNC device sends various control signals to control the movement of the machine tool and automatically process the parts according to the shape and size required by the drawing.

[0003] A stainless steel valve seat and a valve needle are provided in the electronic expansion valve. When in use, it is necessary to ensure that the contact surface between the valve seat and the valve needle has good sealing performance. When processing the stainless steel valve seat, since the distance between the sealing interface of the valve seat and the end face of the valve seat is relatively long, the sealing interface needs to be processed by a longer tool. When the distance between the cutting edge of the tool and the tool holder is too large, the tool will swing when processing the sealing interface, affecting the processing accuracy of the sealing interface and causing a decrease in the valve seat processing yield rate. Summary of the invention

[0004] In view of the above shortcomings, the technical problem to be solved by the present invention is to provide a valve seat sealing interface machining tool assembly for preventing the tool from swinging during machining, thereby improving the machining accuracy of the valve seat.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A valve seat sealing interface processing tool assembly is used to process the sealing interface of the valve seat, including a tool and a tool head positioning seat respectively arranged on both sides of the valve seat, the end of the tool abuts on the tool head positioning seat to position the end of the tool through the tool head positioning seat, the tool head positioning seat includes a fixture base and a positioning rod, the positioning rod is slidably installed on the fixture base, the positioning rod is adapted to the valve seat, a positioning groove is provided on the positioning rod, and the end of the tool abuts in the positioning groove; a pad for absorbing the size error of the valve seat is provided in the middle of the positioning rod, and the length of the positioning rod is changed by squeezing the pad at both ends of the positioning rod to absorb the size error of the valve seat.

[0007] As a preferred solution of the present invention, a conical sliding surface is provided on the fixture base, and the positioning rod abuts against the conical sliding surface, and the positioning rod is pushed toward the valve seat through the conical sliding surface.

[0008] As a preferred solution of the present invention, a deformation groove is provided on the clamp base, the clamp base is extended and retracted through the deformation groove, and the deformation groove is connected to the conical push surface.

[0009] As a preferred solution of the present invention, the clamp base includes a clamp fixing part and a guide installation part which are connected to each other, the conical sliding surface is arranged on the inner side of the clamp fixing part, a guide plate is installed on the guide installation part, and the positioning rod is slidably installed on the guide plate.

[0010] As a preferred solution of the present invention, a return spring is provided between the positioning rod and the guide plate, and the positioning rod abuts against the conical sliding surface through the return spring.

[0011] As a preferred solution of the present invention, a pushing head and a positioning head are respectively installed at both ends of the positioning rod. The pushing head is slidably installed in the fixture base, the positioning head is arranged on the outside of the fixture base and is adapted to the valve seat, and the positioning groove is arranged at the end of the positioning head.

[0012] As a preferred solution of the present invention, a mounting cavity is provided in the pushing head, the end of the positioning rod is installed in the mounting cavity, and a cushion block is filled between the inner wall of the mounting cavity and the positioning rod.

[0013] As a preferred solution of the present invention, a rotating shaft hole is provided in the positioning head, a rotating member is rotatably installed in the rotating shaft hole, and the positioning groove is arranged on the rotating member.

[0014] As a preferred solution of the present invention, the tool comprises a tool body, a cutting edge section and a positioning cutter head which are connected in sequence, and the cutting edge section is provided with an arc-shaped turning edge for machining the sealing interface of the valve seat.

[0015] As a preferred solution of the present invention, a flow channel is provided on the tool body, and the flow channel opening is arranged toward the arc-shaped turning edge.

[0016] The beneficial effects of the present invention are as follows: (1) the end of the tool is positioned and supported by the tool head positioning seat to ensure that the tool and the valve seat are coaxially arranged, and at the same time, the tool is prevented from swinging during the processing, thereby improving the processing accuracy of the valve seat and improving the yield rate of the valve seat.

[0017] (2) By setting the spacer, the shrinkage of the positioning rod is facilitated, and the size error of the valve seat to be processed is eliminated, thereby ensuring that the positioning rod can abut against each valve seat.

[0018] (3) By abutting the end of the tool against the positioning groove, the positioning groove can position and fix the tool, thereby improving the processing accuracy of the valve seat and improving the yield rate of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the usage structure of the machining tool assembly.

[0020] Figure 2 It is a cross-sectional view of the machining tool assembly in use.

[0021] Figure 3 It is a cross-sectional view of the valve seat.

[0022] Figure 4 It is a schematic diagram of the structure of the tool.

[0023] Figure 5 It is a cross-sectional view of the cutter head positioning seat.

[0024] Figure markings: valve seat 1, sealing interface 1-1, V-shaped hole 1-2, through hole 1-3, tool 2, tool body 2-1, cutting edge section 2-2, positioning tool head 2-3, arc turning edge 2-4, flow channel 2-5, chip groove 2-6, slope 2-7, tool head positioning seat 3, fixture base 3-1, positioning rod 3-2, positioning groove 3-3, conical push surface 3-4, deformation groove 3-5, fixture fixing part 3-6, guide mounting part 3-7, guide plate 3-8, return spring 3-9, push head 3-10, positioning head 3-11, mounting cavity 3-12, cushion block 3-13, shaft hole 3-14, rotating part 3-15. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] A valve seat sealing interface machining tool assembly is used to machine a sealing interface 1-1 of a valve seat 1. A coaxial through hole 1-3 and a V-shaped hole 1-2 are provided in the valve seat 1. The through hole 1-3 and the V-shaped hole 1-2 are connected. The sealing interface 1-1 is located at the connection between the through hole 1-3 and the V-shaped hole 1-2. Due to the large length of the through hole 1-3, the tool 2 for machining the sealing interface 1-1 is a slender tool. During the machining process of the slender tool, the tool is prone to swing, which affects the machining accuracy of the sealing interface 1-1. This embodiment is to prevent the tool from swinging during the machining process. The tool assembly includes a tool 2 and a tool head positioning seat 3. The tool 2 and the tool head positioning seat 3 are respectively arranged on both sides of the valve seat 1, that is, the tool 2 is fixed on the tool seat of the CNC machine tool, the tool head positioning seat 3 and the workpiece are respectively fixed in the workpiece fixture, and the tool head positioning seat 3 is located on the inner side of the workpiece. When the valve seat 1 is processed, the end of the tool 2 abuts on the tool head positioning seat 3. The tool 2 is used to process the valve seat 1, and the tool head positioning seat 3 is used to position and support the end of the tool 2 to prevent the tool 2 from swinging, thereby ensuring the processing accuracy of the valve seat 1 and improving the yield rate of the valve seat 1.

[0027] Among them, the tool head positioning seat 3 includes a clamp base 3-1 and a positioning rod 3-2. The positioning rod 3-2 can be slidably installed on the clamp base 3-1. The positioning rod 3-2 is adapted to the valve seat 1. When the clamp clamps the workpiece, the clamp base 3-1 will shrink as the clamp clamps, thereby pushing the positioning rod 3-2 installed on the clamp base 3-1 to move, and the positioning rod 3-2 is abutted against the V-shaped hole 1-2 of the valve seat 1, so that the positioning rod 3-2 is coaxially arranged with the V-shaped hole 1-2 of the valve seat 1; a positioning groove 3-3 is provided on the positioning rod 3-2. During processing, the end of the tool 2 abuts against the positioning groove 3-3, and the tool 2 is positioned and fixed through the positioning groove 3-3.

[0028] In this embodiment, the V-shaped hole 1-2 of the valve seat 1 can position the end of the positioning rod 3-2, ensuring that the positioning groove 3-3 at the end of the positioning rod 3-2 is coaxial with the V-shaped hole 1-2, and the positioning groove 3-3 is a V-shaped groove. When the tool 2 abuts against the positioning groove 3-3, the tool 2 and the V-shaped groove 3-3 are coaxially arranged, thereby ensuring that the tool 2 is coaxial with the V-shaped hole 1-2. Since the sealing interface 1-1 is arranged close to the V-shaped hole 1-2, the processing accuracy of the sealing interface 1-1 is ensured by ensuring that the tool 2 is coaxial with the V-shaped hole 1-2.

[0029] The clamp base 3-1 includes a clamp fixing part 3-6 and a guide installation part 3-7 which are connected to each other. The diameter of the clamp fixing part 3-6 is larger than the diameter of the guide installation part 3-7. The clamp base 3-1 is installed in the clamp through the clamp fixing part 3-6. A conical sliding surface 3-4 is provided in the clamp fixing part 3-6, and the positioning rod 3-2 abuts against the conical sliding surface 3-4. When the clamp fixing part 3-6 is contracted by the action of the clamp, the conical sliding surface 3-4 of the clamp fixing part 3-6 contracts, and the positioning rod 3-2 is driven to move toward the valve seat 1 through the conical sliding surface 3-4.

[0030] In order to facilitate the movement of the positioning rod 3-2 by contracting the clamp fixing part 3-6, the clamp fixing part 3-6 is a hollow part, and a deformation groove 3-5 is provided on the clamp fixing part 3-6. When the clamp is clamped, the width of the deformation groove 3-5 of the clamp fixing part 3-6 is reduced, thereby realizing the contraction of the clamp fixing part 3-6. The deformation groove 3-5 is connected to the conical sliding surface 3-4 to ensure that the conical sliding surface 3-4 can contract. Preferably, the deformation groove 3-5 extends into the guide mounting part 3-7 to ensure that the clamp fixing part 3-6 can contract as a whole.

[0031] A guide plate 3-8 is installed on the guide installation part 3-7, one end of the positioning rod 3-2 is limitedly installed in the clamp base 3-1 through the guide plate 3-8, and a guide hole is provided on the guide plate 3-8, and the positioning rod 3-2 is slidably connected to the guide plate 3-8 through the guide hole.

[0032] A return spring 3-9 is provided between the positioning rod 3-2 and the guide plate 3-8, and the positioning rod 3-2 abuts against the conical push surface 3-4 through the return spring 3-9, ensuring that the positioning rod 3-2 moves under the action of the conical push surface 3-4.

[0033] A pushing head 3-10 and a positioning head 3-11 are respectively installed at both ends of the positioning rod 3-2. The pushing head 3-10 is slidably installed in the fixture base 3-1, and the pushing head 3-10 is truncated cone-shaped to ensure that the pushing head 3-10 abuts against the conical pushing surface 3-4. The positioning head 3-11 is arranged on the outside of the fixture base 3-1, and the positioning head 3-11 is adapted to the V-shaped hole 1-2 of the valve seat 1, that is, the positioning head 3-11 abuts against the V-shaped hole 1-2. Preferably, the positioning head 3-11 is spherical. When the positioning head 3-11 abuts against the V-shaped hole 1-2, the positioning head 3-11 is coaxially arranged with the V-shaped hole 1-2. The positioning groove 3-3 is arranged at the end of the positioning head 3-11 and is coaxially arranged with the positioning head 3-11. When the positioning head 3-11 is coaxial with the V-shaped hole 1-2, the positioning groove 3-3 is also in a coaxial state with the V-shaped hole 1-2.

[0034] Due to the deviation of the axial dimension of the valve seat 1, it is easy for the end of the positioning rod 3-2 to fail to abut against the V-shaped hole 1-2. In order to ensure that the positioning rod 3-2 can always abut against the V-shaped holes 1-2 of different valve seats 1, a structure that can shorten the positioning rod 3-2 is set on the positioning rod 3-2. In the process of the clamp clamping each valve seat 1, the positioning rod 3-2 is shortened by the force of the conical push surface 3-4 and the V-shaped hole 1-2, ensuring that the positioning rod 3-2 abuts against the V-shaped hole 1-2. An installation cavity 3-12 is provided in the push head 3-10, and the end of the positioning rod 3-2 is installed in the installation cavity 3-12. A cushion block 3-13 is filled between the inner wall of the installation cavity 3-12 and the positioning rod 3-2. Preferably, the shrinkage of the cushion block 3-13 is 0.5-1mm. The shrinkage of the positioning rod 3-2 is achieved by shrinking the cushion block 3-13, thereby ensuring that the positioning rod 3-2 can abut against each valve seat 1.

[0035] In order to prevent the positioning groove 3-3 from rubbing against the tool 2 and causing damage to the tool 2, a shaft hole 3-14 is provided in the positioning head 3-11, and a rotating part 3-15 is rotatably installed in the shaft hole 3-14. The positioning groove 3-3 is arranged on the rotating part 3-15, so that the positioning groove 3-3 can rotate relative to the positioning rod 3-2.

[0036] The tool 2 includes a tool body 2-1, a cutting edge section 2-2 and a positioning cutter head 2-3 which are connected in sequence. The tool body 2-1, the cutting edge section 2-2 and the positioning cutter head 2-3 are all cylindrical, and the end of the positioning cutter head 2-3 is spherical to ensure that when the positioning cutter head 2-3 abuts against the positioning groove 3-3, the positioning cutter head 2-3 is coaxially arranged with the positioning groove 3-3. An arc-shaped turning edge 2-4 is provided on the cutting edge section 2-2. The arc-shaped turning edge 2-4 is used to process the sealing interface 1-1 of the valve seat 1. In order to facilitate chip removal during the processing of the arc-shaped turning edge 2-4, a spiral chip removal groove 2-6 is provided on the side wall of the cutting edge section 2-2.

[0037] A flow channel 2-5 is provided on the tool body 2-1, and the opening of the flow channel 2-5 is arranged toward the arc-shaped turning edge 2-4, and is used to flush the arc-shaped turning edge 2-4, on the one hand to prevent thermal expansion and contraction caused by the heating of the workpiece, and on the other hand to prevent waste chips from scratching the sealing interface 1-1. Preferably, a slope 2-7 is provided on the tool body 2-1, so that waste chips generated by processing can be discharged out of the through hole 1-3 through the slope 2-7, and the opening of the flow channel 2-5 is located inside the slope 2-7.

[0038] The working principle of this tool assembly is as follows:

[0039] First, fix the tool 2 on the tool holder of the CNC machine tool, install the tool head positioning seat 3 in the fixture, and the axial position of the tool head positioning seat 3 and the fixture is fixed; then, fix the valve seat 1 on the fixture, and clamp the fixture. During the clamping process, the fixture base 3-1 shrinks due to the force of the fixture, and the positioning rod 3-2 moves toward the valve seat 1 under the action of the conical push surface 3-4, so that the positioning rod 3-2 abuts against the V-shaped hole 1-2 of the valve seat 1. As the fixture continues to be clamped, the cushion block 3-13 is compressed, and at the same time The fixture clamps the valve seat 1; the tool 2 is quickly fed to a position 1mm away from the sealing interface 1-1, and then slowly fed to process the sealing interface 1-1. During the feeding process of the tool 2 annular surface, the cutting amount of the tool 2 changes from small to large. When the cutting amount is small, the tool 2 will not swing. When the tool 2 abuts in the positioning groove 3-3, the cutting amount of the tool is the largest. However, due to the supporting effect of the positioning groove 3-3 on the tool 2, the tool 2 can be effectively prevented from shaking during the feeding process, thereby ensuring the processing accuracy of the sealing interface 1-1.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0041] Although this article uses more terms corresponding to the figure marks in the figures, it does not exclude the possibility of using other terms; these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A valve seat sealing interface machining tool assembly, used for machining a sealing interface (1-1) of a valve seat (1), characterized in that: The invention comprises a tool (2) and a tool head positioning seat (3) respectively arranged on both sides of a valve seat (1), the end of the tool (2) abuts against the tool head positioning seat (3) so that the end of the tool (2) is positioned by the tool head positioning seat (3), the tool head positioning seat (3) comprises a fixture base (3-1) and a positioning rod (3-2), the positioning rod (3-2) is slidably mounted on the fixture base (3-1), the positioning rod (3-2) is adapted to the valve seat (1), a positioning groove (3-3) is provided on the positioning rod (3-2), and the end of the tool (2) abuts against the positioning groove (3-3); A cushion block (3-13) for absorbing the size error of the valve seat is provided in the middle of the positioning rod (3-2), and the length of the positioning rod (3-2) is changed by squeezing the cushion block (3-13) at both ends of the positioning rod (3-2) to absorb the size error of the valve seat; The fixture base (3-1) is provided with a conical push surface (3-4), the positioning rod (3-2) abuts against the conical push surface (3-4), and the positioning rod (3-2) is pushed toward the valve seat (1) via the conical push surface (3-4); The clamp base (3-1) is provided with a deformation groove (3-5), the clamp base (3-1) is extended and retracted through the deformation groove (3-5), and the deformation groove (3-5) is connected to the conical push surface (3-4); The clamp base (3-1) comprises a clamp fixing portion (3-6) and a guide mounting portion (3-7) which are connected to each other, a conical sliding surface (3-4) is arranged on the inner side of the clamp fixing portion (3-6), a guide plate (3-8) is mounted on the guide mounting portion (3-7), a positioning rod (3-2) is slidably mounted on the guide plate (3-8), and a deformation groove (3-5) extends into the guide mounting portion (3-7).

2. A valve seat sealing interface machining tool assembly according to claim 1, characterized in that: A return spring (3-9) is provided between the positioning rod (3-2) and the guide plate (3-8), and the positioning rod (3-2) abuts against the conical sliding surface (3-4) via the return spring (3-9).

3. The sealing interface machining tool assembly for a valve seat according to claim 1, characterized in that: A push head (3-10) and a positioning head (3-11) are respectively installed at both ends of the positioning rod (3-2); the push head (3-10) is slidably installed in the fixture base (3-1); the positioning head (3-11) is arranged outside the fixture base (3-1) and is adapted to the valve seat (1); and the positioning groove (3-3) is arranged at the end of the positioning head (3-11).

4. A valve seat sealing interface machining tool assembly according to claim 3, characterized in that: The pushing head (3-10) is provided with a mounting cavity (3-12), the end of the positioning rod (3-2) is mounted in the mounting cavity (3-12), and a cushion block (3-13) is filled between the inner wall of the mounting cavity (3-12) and the positioning rod (3-2).

5. A valve seat sealing interface machining tool assembly according to claim 3, characterized in that: A rotating shaft hole (3-14) is provided in the positioning head (3-11), a rotating member (3-15) is rotatably installed in the rotating shaft hole (3-14), and the positioning groove (3-3) is arranged on the rotating member (3-15).

6. A valve seat sealing interface machining tool assembly according to claim 1, characterized in that: The tool (2) comprises a tool body (2-1), a cutting edge section (2-2) and a positioning tool head (2-3) which are connected in sequence, and the cutting edge section (2-2) is provided with an arc-shaped turning edge (2-4) for machining a sealing interface (1-1) of a valve seat (1).

7. A valve seat sealing interface machining tool assembly according to claim 6, characterized in that: The tool body (2-1) is provided with a flow channel (2-5), and the opening of the flow channel (2-5) is arranged toward the arc-shaped turning edge (2-4).

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