Valve seat machining system and method

Abstract

This invention discloses a valve seat machining system and method, belonging to the field of valve seat machining technology. It includes a machining center and a wire EDM machine arranged sequentially, a frame positioned on one side of the machining center and wire EDM machine, a rotating table rotatably mounted on the frame and rotating past the machining center and wire EDM machine, and a clamping assembly mounted on the rotating table for clamping the valve seat blank. The machining method includes the following steps: S1, clamping the cylindrical valve seat blank with the end to be milled facing upwards; S2, rotating the valve seat blank to the milling position, machining the milled groove at the end to be milled; S3, after milling the groove, rotating the valve seat blank to allow the positioning clip to engage with the milled groove, restricting the rotation of the valve seat blank; S4, rotating the valve seat blank to the wire EDM machining position with the cylindrical wall facing upwards, and machining the opening in the cylindrical wall. Through the rapid clamping and releasing function of the clamping assembly and the rapid and precise rotation of the rotating table, the conversion between different machining stages of the valve seat blank is quick and accurate.

Description

Technical Field

[0001] This invention belongs to the field of valve seat processing technology, specifically relating to a valve seat processing system and processing method. Background Technology

[0002] In the valve manufacturing industry, due to the wide range of applications and diverse functions of valves, the valve seat structures of different manufacturers and different types of valves vary considerably. Taking one type of valve seat as an example, it has a cylindrical structure, closed at one end and open at the other end with a milled groove, while a window is opened on the cylindrical wall.

[0003] For the machining of this type of valve seat, milling grooves are usually completed with the help of a machining center, while the window needs to be machined by wire cutting machine. There are strict positioning requirements between the window and the milled groove.

[0004] In existing machining techniques, a window is typically machined using a wire EDM machine. Then, an attempt is made to fix and position the valve seat by inserting a plunger into the window to block one end, followed by milling. However, precise positioning of the plunger during insertion is difficult, and the valve seat is prone to slight displacement during subsequent machining. Even if positioning appears successful initially, the cutting force generated during milling can cause the valve seat to shift due to poor plunger positioning. Once the valve seat position changes, the relative positional accuracy between the window and the milled groove cannot be guaranteed, resulting in a valve seat that does not meet design requirements. This not only affects valve assembly but may also lead to problems such as poor valve sealing and unstable fluid control, reducing the overall quality and performance of the valve.

[0005] With the increasing demands for valve quality and precision in industrial production, existing valve seat machining and positioning technologies are no longer sufficient. Therefore, developing a valve seat machining system and method that can effectively solve the positioning problem between the valve seat and the milled groove, ensuring the machining accuracy of the valve seat, is urgently needed. This is of great significance for improving valve manufacturing quality and promoting the development of the valve industry. Summary of the Invention

[0006] The purpose of this invention is to provide a valve seat machining system and machining method to improve valve seat machining efficiency and positioning accuracy.

[0007] To achieve the above objectives, embodiments of the present invention provide a valve seat machining system for machining valve seat blanks into valve seats. The valve seat blank is cylindrical, with one end closed and the other end open and serving as the end to be milled. The cylindrical wall of the valve seat blank needs to have a window to be opened. The valve seat machining system includes a machining center and a wire cutting machine arranged sequentially, and further includes: A frame, which is disposed on one side of the machining center and the wire cutting machine; A rotating table, which is rotatably mounted on the machine frame, passes sequentially through the machining center and the wire cutting machine after rotation; A clamping assembly is disposed on the rotating table for clamping the valve seat blank.

[0008] For example, at least one embodiment of this disclosure provides a valve seat machining system, wherein the fixture assembly includes: The base body is disposed on the rotating platform; The first V-shaped clamp is fixedly mounted on the base body; The second V-shaped clamp is movably mounted on the seat body. After moving, it moves closer to or further away from the first V-shaped clamp and is positioned opposite to the first V-shaped clamp. It is used to clamp the valve seat blank. A first linear drive unit is disposed on the seat body and connected to the second V-clamp for driving the second V-clamp to clamp the valve seat blank.

[0009] For example, at least one embodiment of this disclosure provides a valve seat processing system in which the rotation axis of the rotating table is vertical, the seat body is rotatably mounted on the rotating table, and the rotation axis is horizontal. The rotation of the seat body is used to change the angle of the valve seat blank, so that the valve seat blank has a milling groove state, an adjustment state, and a wire machining state. In the milling groove state, the end of the valve seat blank to be milled faces the processing center; in the adjustment state, the end of the valve seat blank to be milled faces downward; and in the wire machining state, the end of the valve seat blank to be milled faces one side, and the wall of the valve seat blank to be opened faces the wire cutting machine.

[0010] For example, at least one embodiment of the present disclosure provides a valve seat processing system, which further includes a positioning clamp. The positioning clamp is slidably disposed in the middle of the first V-shaped clamp. The positioning clamp has a limiting state and a retraction state. When it is in the limiting state, the positioning clamp slides into the milling groove to restrict the rotation of the valve seat blank. When it is in the retraction state, the positioning clamp moves away from the valve seat blank. When the valve seat blank is in a milled groove state, the positioning clamp is in a recessed state; when the valve seat blank is in a wire-machined state, the positioning clamp is in a limited state; when the valve seat blank is in an adjusted state, the positioning clamp moves from being away from the milled groove to being close to the milled groove, and then to a limited state.

[0011] For example, a valve seat machining system provided in at least one embodiment of this disclosure further includes: The upper sliding push block is raised and lowered relative to the rotating table. It is used to push the valve seat blank upward after the milling groove is machined and rotated 180 degrees, so that the positioning clip moves from away from the milling groove to close to the milling groove. The second linear drive is disposed on the rotating platform and is capable of pushing the upper sliding push block, causing the upper sliding push block to rise and fall.

[0012] For example, at least one embodiment of this disclosure provides a valve seat processing system in which the sliding direction of the upper sliding push block is perpendicular to the sliding direction of the positioning card; the upper sliding push block has a pushing inclined surface, the positioning card has a pushed inclined surface, the pushing inclined surface can contact the pushed inclined surface to push the positioning card to slide, thereby causing the positioning card to change from an open state to a limited state.

[0013] For example, a valve seat machining system provided in at least one embodiment of this disclosure further includes: A first elastic element, one end of which acts on the positioning clip and the other end of which acts on the base, provides a force to keep the positioning clip in an open state.

[0014] For example, at least one embodiment of this disclosure provides a valve seat processing system, wherein the seat body has a clearance space, and the second linear drive member can pass through the clearance space to push the upper sliding push block up and down.

[0015] This invention also provides a valve seat machining method, comprising the following steps: S1. Clamping step: Clamp the cylindrical valve seat blank so that the end of the valve seat blank to be milled faces upward. S2, Milling step: Transfer the valve seat blank to the milling position and machine the milling groove at the end of the valve seat blank to be milled. S3. Adjustment steps: After milling the groove, rotate the valve seat blank so that the positioning clip can be inserted into the milling groove. The rotation of the valve seat blank is restricted by the positioning clip being inserted into the milling groove. S4. Wire EDM step: Transfer the valve seat blank to the wire EDM machining position and make the cylinder wall of the valve seat blank with the window to be opened facing upwards, and perform window opening machining on the cylinder wall.

[0016] For example, in at least one embodiment of the present disclosure, a valve seat processing method is provided. In the clamping step, in the adjustment step, the rotation of the valve seat blank further includes: after milling the groove, first rotating the valve seat blank 180 degrees around the horizontal axis so that the end to be milled faces down, and then pushing the valve seat blank upward so that the positioning clip is engaged in the milled groove.

[0017] The significant technical effects of the embodiments of the present invention are as follows: The quick clamping and releasing functions of the fixture assembly, along with the rapid and precise rotation of the rotary table, enable rapid and accurate transfer of valve seat blanks between different processing stages. The rotary table can rotate the valve seat blank to the designated position in a short time, reducing equipment waiting time, improving equipment utilization, and thus enhancing overall processing efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the valve seat machining system in one embodiment of the present invention; Figure 2 for Figure 1 A magnified schematic diagram of part A in the middle; Figure 3 for Figure 1 Top view of the valve seat machining system; Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the middle BB; Figure 5 for Figure 4 A magnified schematic diagram of the C-shaped structure. In the figure: frame 100, rotating table 200, clamp assembly 300, base 310, clearance space 311, first V-clamp 320, second V-clamp 330, first linear drive 340, positioning clip 400, pushed inclined surface 410, sliding push block 500, pushing inclined surface 510, second linear drive 600, first elastic element 700. Detailed Implementation

[0020] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0025] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components.

[0027] Please see Figures 1-5This document illustrates a valve seat processing system according to an embodiment of the present invention, used to process a valve seat blank into a valve seat. The valve seat blank is cylindrical, with one end closed and the other end open and being the end to be milled. The cylindrical wall of the valve seat blank needs to have a window to be opened. The valve seat processing system includes a machining center and a wire cutting machine arranged in sequence, and also includes a frame 100, a rotary table 200, and a clamping assembly 300. The frame 100 is arranged on one side of the machining center and the wire cutting machine. The rotary table 200 is rotatably arranged on the frame 100 and passes through the machining center and the wire cutting machine in sequence after rotation. The clamping assembly 300 is arranged on the rotary table 200 and is used to clamp the valve seat blank.

[0028] The clamp assembly 300 includes a base 310, a first V-clamp 320, a second V-clamp 330, and a first linear drive 340. The base 310 is mounted on the rotary table 200. The first V-clamp 320 is fixedly mounted on the base 310. The second V-clamp 330 is movably mounted on the base 310. After moving, it approaches or moves away from the first V-clamp 320 and is positioned opposite to the first V-clamp 320. It is used to clamp the valve seat blank. The first linear drive 340 is mounted on the base 310 and is connected to the second V-clamp 330 to drive the second V-clamp 330 to clamp the valve seat blank.

[0029] The rotating axis of the rotating table 200 is vertical, and the seat 310 is rotatably mounted on the rotating table 200 with a horizontal rotating axis. The rotation of the seat 310 is used to change the angle of the valve seat blank, so that the valve seat blank has a milling groove state, an adjustment state, and a wire machining state. In the milling groove state, the end of the valve seat blank to be milled faces the machining center. In the adjustment state, the end of the valve seat blank to be milled faces downward. In the wire machining state, the end of the valve seat blank to be milled faces one side, and the window opening cylinder wall of the valve seat blank faces the wire cutting machine.

[0030] For example, the frame 100 supports the rotary table 200 and the fixture assembly 300 mounted thereon, and withstands various forces generated during machining. As the supporting structure of the entire machining system, the frame 100 provides a stable mounting base for the rotary table 200. It positions the rotary table 200 on one side of the machining center and the wire EDM machine, allowing the rotary table 200 to rotate smoothly between the two, thereby realizing the orderly transfer of valve seat blanks between different processing equipment and ensuring the continuity and stability of the machining process.

[0031] The rotary table 200 is mainly disc-shaped. Driven by a motor, it rotates around a vertical axis, causing the fixture assembly 300 and the valve seat blank mounted on it to pass sequentially through the machining center and the wire EDM machine. It can also automatically load and unload at the loading and unloading positions. By controlling the rotation angle, the valve seat blank can be positioned appropriately at different processing stages. For example, during milling, the valve seat blank is rotated to the milling position so that the end to be milled faces the machining center accurately; during wire EDM of the window, it is rotated to the wire EDM position so that the wall of the window to be opened is aligned with the wire EDM machine.

[0032] The fixture assembly 300 has a base 310 that can rotate relative to the rotating table 200. The base 310 is provided with mounting positions for mounting the first V-clamp 320, the second V-clamp 330, and the first linear drive 340. The base 310 itself can also rotate about a transverse axis through a dedicated rotation mechanism, which may include bearings, a rotating shaft, and a drive device, for changing the angle of the valve seat blank.

[0033] The seat 310 serves two purposes: firstly, it acts as the mounting base for the first V-clamp 320, the second V-clamp 330, and the first linear drive component 340, ensuring their relative positions are fixed and accurate; secondly, through its own rotation around the transverse axis, it drives the valve seat blank to switch between different angles, meeting the angle requirements of the valve seat blank in different states such as milling, adjustment, and wire machining, ensuring the smooth progress of the machining process. The rotation drive of the seat 310 can be achieved by a motor or a cylinder; any conventional drive method will suffice and will not be described in detail here.

[0034] The first V-clamp 320 is firmly fixed to the seat body 310. The first V-clamp 320 cooperates with the second V-clamp 330 to position and clamp the outer cylindrical surface of the valve seat blank from one side. When clamping the valve seat blank, the V-groove can provide a large contact area, apply clamping force evenly, effectively prevent radial displacement of the valve seat blank during processing, and ensure processing accuracy.

[0035] The second V-clamp 330 moves on the base 310 via a guide rail slider mechanism. The guide rail is a high-precision linear guide, ensuring the straightness and accuracy of the second V-clamp 330's movement. The slider is fixedly connected to the bottom of the second V-clamp 330, allowing the second V-clamp 330 to move closer to or further away from the first V-clamp 320 along the guide rail direction. Driven by the first linear drive 340, the second V-clamp 330 moves along the guide rail, clamping the valve seat blank together with the first V-clamp 320. During clamping, it can adaptively adjust according to the outer diameter of the valve seat blank, ensuring reliable clamping of valve seat blanks of different specifications, preventing loosening or displacement of the valve seat blank during processing, and guaranteeing processing stability and accuracy.

[0036] The first linear drive 340 can be a cylinder, hydraulic cylinder, or electric actuator, etc., providing clamping and releasing power to the second V-clamp 330. By controlling the stroke and output force of the drive, the clamping force between the second V-clamp 330 and the first V-clamp 320 can be precisely adjusted to ensure that the valve seat blank is firmly clamped while avoiding damage to the valve seat blank due to excessive clamping force. After machining, the second V-clamp 330 can be easily released to remove the machined valve seat or replace it with a new valve seat blank.

[0037] The fixture assembly 300, through the cooperation of the first V-clamp 320 and the second V-clamp 330, can accurately position and reliably clamp the valve seat blank. The V-groove design of the V-clamps ensures accurate radial positioning of the valve seat blank, effectively preventing displacement during machining. The first linear drive 340 can precisely control the clamping force, ensuring the valve seat blank remains stable during milling and wire cutting processes, thereby guaranteeing the relative positional accuracy between the window and the milled groove, improving the machining accuracy of the valve seat, and making it more in line with design requirements.

[0038] The dual rotation function of the rotary table 200 and the seat 310 allows the valve seat blank to accurately switch angles between milling, adjustment, and wire machining states. In milling mode, the end of the valve seat blank to be milled is precisely aligned with the machining center, ensuring accurate milling positioning. In wire machining mode, the wall of the valve seat blank to be opened is precisely aligned with the wire EDM machine, ensuring the machining accuracy of the window. This precise angle control avoids machining errors caused by deviations in the valve seat blank's position, further improving the overall machining accuracy of the valve seat.

[0039] By organically combining the machining center and wire EDM machine through the rotary table 200, an integrated process for valve seat processing is realized. Clamped by the fixture assembly 300, the valve seat blank can be sequentially milled at the machining center and then processed for the window on the wire EDM machine via the rotation of the rotary table 200. This eliminates the need for cumbersome re-clamping and positioning between different machines, significantly reducing auxiliary processing time and improving processing efficiency.

[0040] The quick clamping and releasing function of the clamping assembly 300, and the rapid and precise rotation of the rotary table 200, enable the valve seat blank to be transferred quickly and accurately between different processing stages. The first linear drive 340 can quickly drive the second V-clamp 330 to clamp or release the valve seat blank, and the rotary table 200 can rotate the valve seat blank to the designated position in a short time, reducing equipment waiting time, improving equipment utilization, and thus improving overall processing efficiency.

[0041] The adjustability of the clamping assembly 300 allows the machining system to adapt to valve seat blanks of different specifications. The movable design of the second V-clamp 330 allows it to be adjusted according to the outer diameter of the valve seat blank, working together with the first V-clamp 320 to clamp valve seat blanks of different sizes. This versatility reduces the hassle of changing clamps for different valve seat specifications, improving the equipment's applicability and flexibility.

[0042] The design of the machining system fully considers the needs of two different machining processes: milling and wire cutting. Through the cooperation of the rotary table 200 and the fixture assembly 300, the two machining methods can be realized by reasonably adjusting the position and angle of the valve seat blank, which enhances the adaptability of the equipment to different machining process sequences.

[0043] In some examples, a positioning clip 400 is also included, which is slidably disposed in the middle of the first V-clamp 320. The positioning clip 400 has a limiting state and a retraction state. When it is in the limiting state, the positioning clip 400 slides into the milling groove to restrict the rotation of the valve seat blank. When it is in the retraction state, the positioning clip 400 moves away from the valve seat blank. When the valve seat blank is in the milled groove state, the positioning clamp 400 is in the open state; when the valve seat blank is in the wire machining state, the positioning clamp 400 is in the limit state; when the valve seat blank is in the adjustment state, the positioning clamp 400 moves from away from the milled groove to close to the milled groove, and then to the limit state.

[0044] For example, one end of the positioning clip 400 is a chuck that mates with a milling groove. The end of the chuck can be chamfered to facilitate entry into the milling groove. The size and shape of the chuck precisely match the milling groove to be machined on the valve seat blank, allowing it to be tightly embedded in the groove and achieve rotational limiting of the valve seat blank. The other end of the positioning clip 400 can be pushed. The positioning clip 400 is slidably positioned in the middle of the first V-shaped clamp 320. To prevent the positioning clip 400 from accidentally disengaging from the guide rail due to external force during sliding, a limit can be set to restrict the sliding range of the positioning clip 400.

[0045] When the valve seat blank is in the milling groove state, the positioning clamp 400 is in the open state. At this time, the positioning clamp 400 slides to a position away from the valve seat blank to avoid interfering with the milling groove machining of the machining center. During the milling groove machining process, the fixture assembly 300 reliably clamps the valve seat blank through the first V-clamp 320 and the second V-clamp 330 to ensure the smooth progress of the milling groove machining.

[0046] When the valve seat blank rotates to the wire cutting state, the positioning clamp 400 is in a limited position. The clamping head of the positioning clamp 400 accurately enters the milled groove already machined in the valve seat blank. Since the shape and size of the milled groove are fixed, the clamping head of the positioning clamp 400 fits tightly with the milled groove, thereby effectively restricting the rotation of the valve seat blank. This rotational limitation ensures that during wire EDM window machining, the relative position between the window and the milled groove will not deviate due to rotation, ensuring the accuracy of wire EDM machining and solving the problem of bidirectional rotational limitation of windows in the prior art.

[0047] When the valve seat blank is in the adjustment state, the angle of the valve seat blank is adjusted, and the positioning clamp 400 slides from a position away from the milling groove towards the milling groove. The positioning clamp 400 slides until its clamping head is fully inserted into the milling groove, reaching the limit state. In this process, the accurate movement of the positioning clamp 400 helps to maintain effective control over the rotation of the valve seat blank when the angle is adjusted, providing a stable positioning basis for subsequent wire EDM machining.

[0048] When the valve seat blank is in the wire-cutting process, the positioning clip 400 provides reliable rotational limiting for the valve seat blank through its tight fit with the milling groove. Compared to existing technologies where bidirectional rotational limiting is difficult to achieve when using a window for positioning, the fit between the positioning clip 400 and the milling groove can precisely limit the rotation of the valve seat blank in all directions, effectively avoiding positional deviations caused by the rotation of the valve seat blank during wire cutting of the window. This greatly improves the relative positional accuracy between the window and the milling groove, thereby improving the overall machining accuracy of the valve seat, ensuring that the machined valve seat better meets design requirements, and reducing valve assembly problems, poor sealing, and unstable fluid control caused by positional deviations.

[0049] During the transition of the valve seat blank from the milled groove state to the in-line machining state, the accurate movement of the positioning clamp 400 in the adjustment state ensures the positional stability of the valve seat blank during the transition between different machining stages. By gradually rotating and limiting the valve seat blank in the adjustment state, cumulative errors caused by changes in the position of the valve seat blank are avoided, further improving machining accuracy. This positional stability during machining is crucial for ensuring high-precision machining of the valve seat, and can effectively improve the quality and performance of the valve.

[0050] The design of the positioning clip 400 simplifies the positioning operation of the valve seat blank. In existing technologies, positioning by inserting a pin into the window is complex and difficult to achieve precise positioning. However, the positioning clip 400 simply slides along the linear guide slider mechanism in different machining states to switch between limit and open states, making operation simple and quick. This simplified positioning operation reduces positioning time during machining and improves machining efficiency.

[0051] The orderly movement of the positioning clamp 400 in the adjustment state makes the transition of the valve seat blank between different processing states smoother. Because the positioning clamp 400 can accurately enter the limit state, it reduces the time required for repeated adjustments to the processing steps due to inaccurate positioning. For example, in the prior art, inaccurate window positioning may require readjusting the valve seat blank position for milling after wire cutting the window. This solution effectively avoids this situation through the positioning clamp 400, thereby improving the efficiency of the entire processing flow.

[0052] The size and shape of the positioning clamp 400 can be customized according to the milling groove specifications of different valve seat blanks. By replacing different specifications of the positioning clamp 400, this valve seat machining system can adapt to the machining needs of various valve seats. This flexibility allows the equipment to machine valve seats of different types of valves without large-scale adjustments to the overall structure; only the corresponding specifications of the positioning clamp 400 need to be replaced, thus enhancing the versatility and adaptability of the equipment.

[0053] The tight fit between the positioning clamp 400 and the milling groove, along with the high-precision linear guide slider mechanism, makes the positioning operation more reliable. Compared to existing technologies that use window positioning, which are prone to slight displacement of the valve seat blank, the positioning clamp 400 can maintain a stable limit on the valve seat blank throughout the machining process, reducing machining errors caused by unreliable positioning, improving the reliability of equipment machining, and reducing the scrap rate of products.

[0054] In some examples, an upper sliding pusher 500 and a second linear drive 600 are also included. The upper sliding pusher 500 is raised and lowered relative to the rotary table 200 to push the valve seat blank upward after the milled groove is machined and rotated 180 degrees, so that the positioning clip 400 moves from away from the milled groove to near the milled groove. The second linear drive 600 is disposed on the rotary table 200 and can push the upper sliding pusher 500, so that the upper sliding pusher 500 is raised and lowered.

[0055] The sliding direction of the upward sliding push block 500 is perpendicular to the sliding direction of the positioning card 400; the upward sliding push block 500 has a pushing inclined surface 510, and the positioning card 400 has a pushed inclined surface 410. The pushing inclined surface 510 can contact the pushed inclined surface 410, pushing the positioning card 400 to slide, thereby changing the positioning card 400 from the open state to the limited state.

[0056] For example, the sliding pusher 500 can slide smoothly on the seat 310 along a straight line perpendicular to the sliding direction of the positioning clip 400. The sliding pusher 500 has a pushing ramp 510 on the side near the positioning clip 400 to ensure good cooperation with the pushed ramp 410 of the positioning clip 400, achieving efficient pushing action. The portion of the sliding pusher 500 that contacts the valve seat blank provides uniform thrust, preventing deformation of the valve seat blank due to uneven force.

[0057] After the valve seat blank is machined with a milled groove and rotated 180 degrees, the upper sliding pusher 500, pushed by the second linear drive 600, slides upward along the linear guide rail on the seat body 310. First, the upper sliding pusher 500 pushes the valve seat blank upward, positioning it appropriately within the fixture assembly 300, preparing it for the action of the positioning clamp 400. Simultaneously, at the appropriate position, as the upper sliding pusher 500 continues to rise, its pushing inclined surface 510 contacts the pushed inclined surface 410 of the positioning clamp 400, pushing the positioning clamp 400 to slide along the linear guide rail on the first V-clamp 320. This causes the positioning clamp 400 to gradually change from a position away from the milled groove to a position closer to the milled groove, thus achieving precise positioning of the valve seat blank and providing reliable positioning assurance for subsequent wire EDM machining. This dual-function design simplifies the operation steps in the valve seat machining process and improves the continuity and efficiency of machining.

[0058] The second linear drive 600 can be a linear drive device such as an electric push rod, a pneumatic cylinder, or a hydraulic cylinder. The second linear drive 600 precisely controls the sliding of the upper sliding push block 500 according to the needs of the machining process. After the valve seat blank has been milled and rotated 180 degrees, the control system issues a command to start the second linear drive 600. According to preset stroke and thrust parameters, the second linear drive 600 pushes the upper sliding push block 500 upwards along the linear guide rail on the seat 310, achieving precise control of the upper sliding push block 500. This ensures that the valve seat blank and the positioning clamp 400 can operate according to the predetermined action sequence and position requirements, improving the automation and accuracy of the machining process.

[0059] The cooperation between the upper sliding pusher 500 and the second linear drive 600 automates the positioning operation during valve seat machining. After the valve seat blank is milled and rotated, the second linear drive 600 automatically pushes the upper sliding pusher 500, sequentially adjusting the position of the valve seat blank and limiting the positioning clamp 400. This eliminates the need for manual intervention in moving the positioning clamp 400, reducing manual operation time and errors, and improving machining efficiency. The entire process is executed automatically according to a preset program, improving the continuity and stability of machining and making the machining process smoother.

[0060] The second linear drive 600 can precisely control the stroke and thrust of the upper sliding pusher 500, thereby accurately pushing the valve seat blank and the positioning clamp 400 to the predetermined position. The dual-function design of the upper sliding pusher 500 ensures that the position adjustment of the valve seat blank and the limiting action of the positioning clamp 400 are closely connected, quickly achieving accurate positioning of the valve seat blank, saving time for subsequent wire EDM processing, and further improving the overall processing efficiency.

[0061] The sliding pusher 500 and the positioning clamp 400 are engaged by inclined surfaces, enabling precise movement and limiting of the positioning clamp 400. The design of the pushing inclined surface 510 and the pushed inclined surface 410 ensures the stability and accuracy of the positioning clamp 400 during sliding, avoiding positioning deviations caused by manual operation or other unstable factors. This precise positioning control ensures the positional accuracy of the valve seat blank at different processing stages, effectively improving the relative positional accuracy between the window and the milled groove, thereby enhancing the processing quality of the valve seat.

[0062] After the upper sliding pusher 500 pushes the positioning clip 400 into the limit state, it can provide stable limit support. During the subsequent wire EDM process, the external force interference to the valve seat blank may attempt to rotate it, but the positioning clip 400, in synergy with the upper sliding pusher 500, can better resist these external forces, maintain a stable positioning state, reduce machining errors caused by unstable positioning, and improve machining reliability.

[0063] In some examples, a first elastic element 700 is also included, one end of which acts on the positioning clip 400 and the other end on the seat 310, providing a force to keep the positioning clip 400 in an open state. The seat 310 has a clearance space 311 through which the second linear drive 600 can pass to push the sliding push block 500 to slide.

[0064] For example, the first elastic element 700 is a compression spring, with one end abutting in a pre-set fixing groove or screw hole on the seat 310, and the other end abutting against the positioning clip 400. The first elastic element 700 always provides a force to the positioning clip 400 to keep it in an open state. During the milling stage, the positioning clip 400 moves away from the valve seat blank under the action of the spring, avoiding interference with the milling process. When it is necessary to switch the positioning clip 400 to the limit state, the upper sliding push block 500 overcomes the elastic force of the first elastic element 700 and pushes the positioning clip 400 to slide in the direction of milling. When the machining is completed and it is necessary to return the positioning clip 400 to the open state, the first elastic element 700 releases its elastic force, allowing the positioning clip 400 to quickly return to its initial position away from the milling groove, preparing for the next machining cycle. This automatic reset function simplifies the operation process and improves machining efficiency.

[0065] The clearance space 311 is a through-hole structure created in the base 310, ensuring that the free drive end of the second linear drive 600 can pass smoothly and accurately dock with the upper sliding push block 500, achieving effective thrust transmission. The clearance space 311 provides a reasonable installation and operating space for the second linear drive 600, allowing its free drive end to pass through the base 310 and directly push the upper sliding push block 500. This design optimizes the structural layout of the machining system, making the connections between components more compact, reducing potential problems caused by interference between components, and improving the stability and reliability of the entire machining system. Simultaneously, the clearance space 311 also facilitates the installation, debugging, and maintenance of the second linear drive 600.

[0066] The first elastic element 700 enables the positioning latch 400 and the upper sliding push block 500 to automatically reset after machining is completed. This function requires no manual intervention, saving manual operation time and improving the automation level of the machining system. For example, after a machining cycle is completed, the positioning latch 400 quickly returns to the open state under the action of the first elastic element 700, preparing for the next machining, which greatly improves the continuity of machining.

[0067] The design of the clearance space 311 optimizes the structural layout of the machining system, making the connection between the second linear drive 600 and the upper sliding push block 500 more compact and reasonable. This optimized layout helps improve the stability of the entire machining system, reduces potential failures caused by complex connections between components, and further enhances the level of automation and consistency of machining.

[0068] This embodiment also provides a valve seat machining method, including the following steps: S1, Clamping Steps The cylindrical valve seat blank is clamped using the fixture assembly 300, ensuring that the end of the valve seat blank to be milled faces upwards. Specifically, the valve seat blank is placed between the first V-clamp 320 and the second V-clamp 330. The second V-clamp 330 is moved closer to the first V-clamp 320 by the first linear drive member 340, thereby firmly clamping the valve seat blank onto the seat body 310. During this process, it is essential to ensure that the axis of the valve seat blank is parallel or perpendicular to the relevant reference line of the seat body 310 to guarantee the accuracy of subsequent machining.

[0069] Accurate clamping is fundamental to the entire machining process, providing a stable positioning reference for subsequent milling, wire EDM, and other machining operations. Positioning the end to be milled upwards facilitates milling of the valve seat blank by the machining center, effectively ensuring the accuracy of the milling position and the convenience of machining. Simultaneously, the reliable clamping of the fixture assembly 300 prevents displacement of the valve seat blank during machining, ensuring machining accuracy and avoiding machining errors caused by loosening of the valve seat blank.

[0070] S2, Milling steps The valve seat blank is rotated to the milling position using a rotary table 200. At this point, the valve seat blank is in the milling state, with the end to be milled facing the machining center. The machining center, according to a preset program and parameters, uses a suitable milling cutter to mill the end of the valve seat blank. During the machining process, it is crucial to control parameters such as the milling cutter's rotational speed, feed rate, and depth of cut to ensure the dimensional accuracy and surface quality of the milled groove. Simultaneously, attention must be paid to the machining center's cooling and chip removal systems to ensure smooth machining operations.

[0071] Milling is one of the key processes in valve seat machining. The accuracy of milling directly affects the performance of the valve seat and the positioning accuracy of the subsequent wire-cut window. Accurately machining milled grooves that meet design requirements provides a precise positioning reference for the subsequent insertion of the positioning clamp 400. Milling gives the valve seat blank specific structural features, meeting the functional requirements of valve assembly and use. At the same time, reasonable control of machining parameters can improve milling efficiency and reduce machining costs.

[0072] S3, Adjustment Steps After milling, there are two ways to rotate the valve seat blank. One is the conventional method, where the valve seat blank is directly rotated so that the positioning clip 400 engages with the milled groove, thus restricting the rotation of the valve seat blank. The other method is to first rotate the valve seat blank 180 degrees around the horizontal axis after milling, so that the end to be milled faces down, and then use the upper sliding push block 500 to push the valve seat blank upward. Under the push of the second linear drive member 600, the upper sliding push block 500 slides upward along the linear guide rail on the seat body 310, first pushing the valve seat blank so that the valve seat blank is in the appropriate position in the fixture assembly 300. During this process, the pushing inclined surface 510 of the upper sliding push block 500 contacts the pushed inclined surface 410 of the positioning clip 400, pushing the positioning clip 400 to slide, so that the positioning clip 400 changes from a state away from the milled groove to a state of being close to the milled groove, thereby achieving precise positioning of the valve seat blank. During this process, the first elastic element 700 provides the positioning card 400 with a corresponding reset force to ensure that it can return to the appropriate initial position after the action is completed.

[0073] The purpose of the adjustment steps is to provide accurate positioning for wire EDM machining. By engaging the positioning clip 400 into the milling groove, the rotation of the valve seat blank is restricted, effectively avoiding the problem of bidirectional rotational limiting when using window positioning in existing technologies. This significantly improves the positional stability of the valve seat blank during wire EDM machining and ensures the relative positional accuracy between the window and the milling groove. The method of first flipping and then pushing the valve seat blank, combined with the cooperation of the upper sliding push block 500 and the positioning clip 400, enables more precise positioning and further improves machining accuracy. Simultaneously, the inclusion of elastic elements makes the movement of each component more stable and reliable, providing favorable conditions for subsequent machining.

[0074] S4, Wire EDM Steps The valve seat blank is rotated to the wire EDM machining position via a rotary table 200°, with the cylindrical wall to be opened facing upwards. The wire EDM machine, according to the preset program and parameters, uses the electrode wire to machine the window on the cylindrical wall of the valve seat blank. During the machining process, it is crucial to control the wire feed speed and discharge parameters to ensure the dimensional accuracy, shape accuracy, and surface quality of the window. Simultaneously, attention must be paid to the working fluid system of the wire EDM machine to ensure effective cooling and chip removal during machining, preventing problems such as wire breakage.

[0075] Wire EDM is the final and crucial step in valve seat machining, where a window is cut to give the valve seat blank a complete functional structure. Accurately machining the window to meet design requirements is essential for the valve's fluid control and sealing performance. While ensuring the window's machining accuracy, the relative positional accuracy between the window and the milled groove must also be guaranteed to meet valve assembly requirements. Properly controlling machining parameters can improve the efficiency of wire EDM, ensure machining quality, and reduce the scrap rate.

[0076] By employing a clamping method, precise adjustments after milling, and a tight fit between the positioning clip 400 and the milling groove, the rotation and displacement of the valve seat blank during processing are effectively limited, ensuring the relative positional accuracy between the window and the milling groove. Compared with traditional processing methods, this avoids processing errors caused by inaccurate positioning, greatly improves the processing accuracy of the valve seat, makes the processed valve seat more in line with design requirements, and improves the overall quality and performance of the valve.

[0077] The clamping, milling, adjustment, and wire cutting steps work in close coordination, with each step providing an accurate foundation for subsequent steps. For example, accurate clamping provides stable positioning for milling, the precision of milling provides the precise engagement position for the positioning clip 400 in the adjustment step, and the accurate positioning in the adjustment step ensures the positional accuracy of the wire cutting window. This multi-step collaborative machining method improves the overall machining accuracy of the valve seat.

[0078] This machining method optimizes the valve seat machining process, reducing unnecessary operation steps and repetitive positioning processes. Through the rotation of the rotary table 200, the valve seat blank can be quickly switched between the milling and wire EDM machining positions, while the seamless transitions between each step improve machining continuity. Compared to traditional machining methods, it reduces auxiliary machining time and improves machining efficiency.

[0079] During the processing, some operations, such as rotating the valve seat blank and pushing the upper sliding pusher 500, can be achieved through automated or semi-automated devices, reducing manual operation time and errors. For example, the second linear drive 600 automatically pushes the upper sliding pusher 500 to achieve the limiting action of the positioning clamp 400, improving the accuracy and efficiency of the operation. This combination of automation and semi-automation further enhances processing efficiency.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of protection of the claims of the present invention.

Claims

1. A valve seat machining system for machining a valve seat blank into a valve seat, the valve seat blank being cylindrical, with one end closed and the other end open and being the end to be milled, the cylindrical wall of the valve seat blank needing to have a window to be opened, the valve seat machining system comprising a machining center and a wire cutting machine arranged sequentially, characterized in that, Also includes: A frame (100) is disposed on one side of the machining center and the wire cutting machine; A rotating table (200) is rotatably mounted on the frame (100) and passes through the machining center and the wire cutting machine in sequence after rotation; A clamping assembly (300) is disposed on the rotary table (200) for clamping the valve seat blank.

2. The valve seat machining system according to claim 1, characterized in that, The clamp assembly (300) includes: A seat (310) is disposed on the rotating platform (200); The first V-shaped clip (320) is fixedly mounted on the base (310); The second V-shaped clamp (330) is movably disposed on the seat (310). After moving, it moves closer to or further away from the first V-shaped clamp (320) and is disposed opposite to the first V-shaped clamp (320). It is used to clamp the valve seat blank. A first linear drive (340) is disposed on the seat (310) and connected to the second V-clamp (330) for driving the second V-clamp (330) to clamp the valve seat blank.

3. The valve seat machining system according to claim 2, characterized in that, The rotating axis of the rotating table (200) is vertical, and the seat (310) is rotatably mounted on the rotating table (200) with the rotating axis being horizontal. The rotation of the seat (310) is used to change the angle of the valve seat blank, so that the valve seat blank has a milling state, an adjustment state, and a wire machining state. When it is in the milling state, the end of the valve seat blank to be milled faces the machining center. When it is in the adjustment state, the end of the valve seat blank to be milled faces downward. When it is in the wire machining state, the end of the valve seat blank to be milled faces one side, and the window opening cylinder wall of the valve seat blank faces the wire cutting machine.

4. The valve seat machining system according to claim 3, characterized in that, It also includes a positioning clip (400), which is slidably disposed in the middle of the first V-shaped clamp (320). The positioning clip (400) has a limiting state and a retraction state. When it is in the limiting state, the positioning clip (400) slides into the milling groove to restrict the rotation of the valve seat blank. When it is in the retraction state, the positioning clip (400) moves away from the valve seat blank. When the valve seat blank is in the milled groove state, the positioning clip (400) is in the open state; when the valve seat blank is in the wire machining state, the positioning clip (400) is in the limit state; when the valve seat blank is in the adjustment state, the positioning clip (400) moves from away from the milled groove to close to the milled groove, and then to the limit state.

5. A valve seat machining system according to claim 4, characterized in that, Also includes: The upper sliding push block (500) is raised and lowered relative to the rotating table (200) and is used to push the valve seat blank upward after the milling groove is machined and rotated 180 degrees, so that the positioning clip (400) moves from away from the milling groove to close to the milling groove. The second linear drive (600) is disposed on the rotary table (200) and can push the upper sliding push block (500) so that the upper sliding push block (500) rises and falls.

6. A valve seat machining system according to claim 5, characterized in that, The sliding direction of the upper sliding push block (500) is perpendicular to the sliding direction of the positioning card (400); the upper sliding push block (500) has a pushing slope (510), and the positioning card (400) has a pushed slope (410). The pushing slope (510) can contact the pushed slope (410) to push the positioning card (400) to slide, thereby changing the positioning card (400) from the open state to the limited state.

7. A valve seat machining system according to claim 6, characterized in that, Also includes: A first elastic element (700) acts on the positioning clip (400) at one end and on the seat (310) at the other end, providing a force to keep the positioning clip (400) in an open state.

8. A valve seat machining system according to claim 6, characterized in that, The seat (310) has a clearance space (311) through which the second linear drive (600) can pass to push the upper sliding push block (500) up and down.

9. A method for machining a valve seat, characterized in that, Includes the following steps: S1. Clamping step: Clamp the cylindrical valve seat blank so that the end of the valve seat blank to be milled faces upward. S2, Milling step: Transfer the valve seat blank to the milling position and machine the milling groove at the end of the valve seat blank to be milled. S3. Adjustment steps: After milling the groove, rotate the valve seat blank so that the positioning clip can be inserted into the milling groove. The rotation of the valve seat blank is restricted by the positioning clip being inserted into the milling groove. S4. Wire EDM step: Transfer the valve seat blank to the wire EDM machining position and make the cylinder wall of the valve seat blank with the window to be opened facing upwards, and perform window opening machining on the cylinder wall.

10. A valve seat processing method according to claim 9, characterized in that, In the clamping step, in the adjustment step, the rotation method of the valve seat blank further includes: after milling the groove, first rotate the valve seat blank 180 degrees around the horizontal axis so that the end to be milled faces down, and then push the valve seat blank upward so that the positioning clip is inserted into the milled groove.

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