A compound turning device for valve disc machining

Abstract

The application relates to the technical field of turning machine tools, and discloses a composite turning equipment for valve disc machining, which comprises a machine tool body and a turning mechanism assembled on the machine tool body. The machine tool body is assembled with a three-jaw chuck for clamping workpiece raw materials through a driving unit arranged in the machine tool body. The turning mechanism comprises a bearing seat slidingly installed on the machine tool body and connected with the driving unit. The bearing seat is assembled with a mounting seat through a sliding rail unit one arranged on the bearing seat. The mounting seat is assembled with a tool seat through a sliding rail unit two arranged on the mounting seat. The composite turning equipment for valve disc machining can effectively solve the problem that, in the prior art, after a turning tool completes a turning process on the contour of a valve disc, an operator or a machine tool holder needs to perform a tool changing action to replace the turning tool with a cutting tool, and then cut the formed valve disc from a metal shaft material.

Description

Technical Field

[0001] This invention relates to the field of turning machine tool technology, and more specifically to a composite turning equipment for valve disc machining. Background Technology

[0002] In a valve body containing a valve disc, the hydraulic operation is a dynamic control process based on the balance between fluid pressure and mechanical force. Hydraulic oil, as the force transmission medium, enters the valve body. Because the valve disc is usually designed with a specific geometry, when the hydraulic oil flows through the valve disc, it creates a pressure difference between its upstream and downstream surfaces or acts directly on the pressure-bearing area, thereby generating an axial or radial hydraulic pressure. When the hydraulic pressure is greater than the sum of the spring preload and friction, the hydraulic pressure overcomes the resistance, pushing the valve disc away from the valve seat, and the valve opens. When the spring force is greater than the hydraulic pressure, the spring presses the valve disc tightly against the valve seat sealing surface, and the valve closes.

[0003] Existing turning equipment often employs a single tool configuration when performing the aforementioned process. After the turning tool completes the turning operation on the valve disc's outline, the operator or machine tool holder needs to perform a tool change to replace the turning tool with a parting tool in order to cut the formed valve disc off the metal shaft. Furthermore, before the turning process begins, one end of the metal shaft is usually clamped using the machine tool's three-jaw chuck, and the other end is held in place by the tailstock tip to form a stable clamping state with both ends fixed. However, as the valve discs are cut off one by one, the effective length of the metal shaft is reduced. In order to maintain reliable clamping of the remaining shaft, the operator must manually adjust the position of the tailstock on the machine bed multiple times to re-clamp the tailstock tip against the end face of the shaft, making the operation quite cumbersome. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a composite turning equipment for valve disc processing, which can effectively solve the problem in the prior art that after the turning tool completes the turning process of the valve disc outline, the operator or machine tool tool holder needs to perform a tool change action to replace the turning tool with a parting tool and then cut the formed valve disc from the metal shaft material.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a composite turning equipment for valve disc processing, including a machine tool body and a turning mechanism assembled on the machine tool body. The machine tool body is equipped with a three-jaw chuck for clamping the workpiece material by means of a drive motor set therein. The machine tool body is also provided with a power unit for adjusting the position of the turning mechanism. The turning mechanism includes a support seat that is slidably mounted on the machine tool body and connected to the power unit. The support seat is equipped with a mounting base via a slide rail unit 1. The mounting base is equipped with a tool holder via a slide rail unit 2. There are two tool holders. One tool holder is equipped with a turning tool body for turning the outer contour of the valve disc, and the other tool holder is equipped with a cutting tool body for cutting off the workpiece. The machine tool body is also equipped with a tailstock mechanism for clamping the workpiece.

[0006] Furthermore, an extrusion plate is fixedly connected to the outer side of the mounting base, and the outer side of the extrusion plate is designed with an angled surface.

[0007] Furthermore, the tailstock mechanism includes a tailstock base plate that is slidably mounted on the machine tool body, and the tailstock base plate is fitted with a tailstock body through a guide groove provided on its top, and a center sleeve is fitted inside the tailstock body, the central axis of the center sleeve being coaxial with the three-jaw chuck.

[0008] Furthermore, the tailstock base plate is connected to the support seat via an adjusting screw located inside it. There are two adjusting screws symmetrically distributed along the center plane of the tailstock base plate. A scale is mounted on the outer side of the support seat. The operator can accurately set the distance between the support seat and the tailstock base plate according to the scale to match the valve disc processing length requirements, thereby reducing dimensional errors caused by manual adjustment.

[0009] Furthermore, the tailstock mechanism is also equipped with a switching unit for adjusting the position of the tailstock body; The switching unit includes a fixing plate mounted on the tailstock base plate, and a guide rod connected to the tailstock body is slidably installed inside the fixing plate. There are two guide rods symmetrically distributed along the center plane of the fixing plate, and a strong spring is sleeved on the outer circumference of the guide rod.

[0010] Furthermore, the switching unit also includes a fixing seat fixedly installed on the tail seat base plate, and the fixing seat has two fixing seats that are symmetrically distributed along the center plane of the tail seat base plate. The fixing seat is equipped with an abutment plate that fits against the outer side of the tail seat body, and the outer side of the abutment plate is designed with an inclined surface.

[0011] Furthermore, the outer side of the tailstock body is fitted with rollers that fit against the outer side of the abutment plate.

[0012] Furthermore, a connecting rod is fitted on the outer side of the abutment plate, and the connecting rod is connected to the tailstock base plate through a pin set inside it. A fixing rod assembly is fixedly connected to the bottom of the tailstock base plate, and a movable frame connected to the side of the connecting rod away from the abutment plate is slidably connected to the outer circumference of the fixing rod assembly. A return spring is sleeved on the outer circumference of the fixing rod assembly, and the movable frame is arc-shaped on the side away from the connecting rod.

[0013] The technical solution provided by this invention has the following advantages compared with the prior art: This invention features a tailstock mechanism. Two tool holders are symmetrically arranged along the central plane on the mounting base, each equipped with a lathe tool body for machining the valve disc contour and a cutting tool body for cutting off the workpiece. The tool holders are driven to move radially via a slide rail unit. When the lathe tool enters the machining area, the cutting tool automatically avoids it, and when the cutting tool enters, the lathe tool automatically retracts. This eliminates the need for manual tool changing or tool changing operations by the machine tool holder. During turning feed, the inclined extrusion plate on the outer side of the mounting base pushes the movable frame with displacement. Through linkage and abutment plate, it overcomes the force of the strong spring and pushes the tailstock body along the guide groove toward the workpiece, causing the center sleeve to automatically clamp the end of the workpiece. This automates the workpiece clamping and clamping without manual operation of the center. When switching to the cutting tool position, the extrusion plate and the movable frame gradually separate. The return spring drives the movable frame to return to its original position, and the abutment plate releases its constraint on the tailstock body. The return spring causes the tailstock body and center sleeve to retract axially, freeing up radial feed space for the cutting tool and structurally preventing rigid collisions between the cutting tool and the center. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-dimensional separation structure of the turning mechanism according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the planar structure of the tool holder according to an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the tailstock mechanism according to an embodiment of the present invention; Figure 5 This is a three-dimensional separation structure diagram of the tailstock body, the center sleeve, and the tailstock base plate according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the three-dimensional separation structure of the switching unit in an embodiment of the present invention; Figure 7 This is a schematic diagram of the planar structure of the tailstock body according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the workpiece material being processed according to an embodiment of the present invention.

[0016] The labels in the diagram represent: 100. Raw materials for the workpiece; 1. Machine tool body; 2. Turning mechanism; 21. Bearing seat; 211. Scale; 22. Slide rail unit one; 221. Slide rail unit two; 23. Mounting seat; 231. Extrusion plate; 24. Tool holder; 25. Turning tool body; 26. Cutting tool body; 3. Drive unit; 4. Three-jaw chuck; 5. Power unit; 6. Tailstock mechanism; 61. Tailstock base plate; 611. Guide groove; 62. Tailstock body; 621. Roller; 63. Center sleeve; 64. Adjusting screw; 65. Switching unit; 651. Fixing plate; 652. Guide rod; 653. Strong spring; 654. Fixing seat; 655. Abutment plate; 656. Connecting rod; 6561. Pin; 657. Fixing rod group; 6571. Return spring; 658. Movable frame. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] The present invention will be further described below with reference to embodiments.

[0019] Example:

[0020] Please see Figures 1-8 The present invention provides a technical solution: a composite turning equipment for valve disc processing, including a machine tool body 1 and a turning mechanism 2 assembled on the machine tool body 1. The machine tool body 1 is equipped with a three-jaw chuck 4 for clamping the workpiece material 100 through a drive unit 3 set inside it. The machine tool body 1 is also provided with a power unit 5 for adjusting the position of the turning mechanism 2. The turning mechanism 2 includes a support seat 21 slidably mounted on the machine tool body 1 and connected to the power unit 5. The support seat 21 is equipped with a mounting seat 23 via a slide rail unit 22. The mounting seat 23 is equipped with a tool holder 24 via a slide rail unit 221. There are two tool holders 24. One tool holder 24 is equipped with a turning tool body 25 for turning the outer contour of the valve disc, and the other tool holder 24 is equipped with a cutting tool body 26 for cutting off the workpiece. The machine tool body 1 is also equipped with a tailstock mechanism 6 for clamping the workpiece.

[0021] An extrusion plate 231 is fixedly connected to the outer side of the mounting base 23, and the outer side of the extrusion plate 231 is designed with a bevel.

[0022] The tailstock mechanism 6 includes a tailstock base plate 61 that is slidably mounted on the machine tool body 1. The tailstock base plate 61 is fitted with a tailstock body 62 through a guide groove 611 on its top. A center sleeve 63 is fitted inside the tailstock body 62. The central axis of the center sleeve 63 is coaxial with the three-jaw chuck 4. The axis of the center sleeve 63 is forced to be coaxial with the three-jaw chuck 4, so that the workpiece rotation is eccentric and the form and position errors such as turning vibration and ovality are reduced. When the tailstock body 62 is assembled, the coaxiality is used as the reference. The linkage mechanism only performs axial displacement and has no radial runout, ensuring pure rotational motion of the workpiece.

[0023] The tailstock base plate 61 is connected to the support seat 21 by adjusting screws 64 disposed inside it. There are two adjusting screws 64, which are symmetrically distributed along the center plane of the tailstock base plate 61. A scale 211 is mounted on the outer side of the support seat 21.

[0024] The tailstock mechanism 6 is also equipped with a switching unit 65 for adjusting the position of the tailstock body 62; The switching unit 65 includes a fixing plate 651 mounted on the tailstock base plate 61, and a guide rod 652 connected to the tailstock body 62 is slidably installed in the fixing plate 651. There are two guide rods 652, which are symmetrically distributed along the center plane of the fixing plate 651. A strong spring 653 is sleeved on the outer circumference of the guide rod 652. The strong spring 653 is sleeved on the guide rod 652, with one end fixedly installed on the tailstock body 62 and the other end fixedly installed on the fixing plate 651.

[0025] The switching unit 65 also includes a fixing seat 654 fixedly installed on the tail seat base plate 61. The fixing seat 654 has two fixing seats that are symmetrically distributed along the center plane of the tail seat base plate 61. The fixing seat 654 is equipped with an abutment plate 655 that fits against the outer side of the tail seat body 62. The outer side of the abutment plate 655 is designed with a slope.

[0026] The outer side of the tailstock body 62 is equipped with a roller 621 that fits against the outer side of the abutment plate 655. The roller 621 on the outer side of the tailstock body 62 forms rolling contact with the abutment plate 655, and the rolling friction replaces the sliding friction, which helps to improve the smoothness of the movement of the abutment plate 655.

[0027] A connecting rod 656 is mounted on the outer side of the abutment plate 655, and the connecting rod 656 is connected to the tailstock base plate 61 through a pin 6561 set inside it. A fixed rod assembly 657 is fixedly connected to the bottom of the tailstock base plate 61, and a movable frame 658 connected to the side of the connecting rod 656 away from the abutment plate 655 is slidably connected to the outer circumference of the fixed rod assembly 657. A return spring 6571 is sleeved on the outer circumference of the fixed rod assembly 657, and the movable frame 658 is arc-shaped on the side away from the connecting rod 656.

[0028] The working principle and advantages of this composite turning equipment used for valve disc machining: Workpiece clamping process: When performing batch valve disc processing, the operator selects a metal bar of suitable length and diameter as the workpiece material 100, inserts one end of the metal bar into the clamping hole of the three-jaw chuck 4 at the front end of the machine tool body 1, and then retracts the jaws in the three-jaw chuck 4 to center and clamp the first end of the workpiece material 100. For turning of longer shaft parts, in order to prevent the workpiece from bending, deforming or vibrating under the action of the turning radial force, the tailstock mechanism 6 is used to axially clamp the tail end of the workpiece.

[0029] In the initial state, the tailstock body 62 together with the center sleeve 63 is located on the tailstock base plate 61. The operator first adjusts the relative position of the tailstock base plate 61 on the guide rail of the machine tool body 1 according to the total length of the valve disc to be processed, using the scale 211 set on the outside of the bearing seat 21 as a reference.

[0030] Since the tailstock base plate 61 is connected to the carrier seat 21 through the adjusting screw 64, the distance between the carrier seat 21 and the tailstock base plate 61 can be adjusted by turning the adjusting screw 64. When the carrier seat 21 is fed under the drive of the power unit 5, it ensures that the tailstock base plate 61 and the turning area maintain a reasonable distance match. The tailstock base plate 61 is connected to the carrier seat 21 through the adjusting screw 64, so that the carrier seat 21 and the tailstock base plate 61 can form a "whole". When the carrier seat 21 moves along the guide rail of the machine tool body 1, the tailstock base plate 61 can move synchronously with the carrier seat 21, so that the distance between the adjusted tailstock base plate 61 and the carrier seat 21 always maintains the preset distance.

[0031] By adjusting the screw 64 to switch the distance between the bearing seat 21 and the tailstock base plate 61, it can be ensured that each time the valve disc that has been turned is separated from the workpiece material 100, the center sleeve 63 always remains in the same position, without the need for subsequent manual adjustment.

[0032] The tailstock base plate 61 is provided with a guide groove 611, and the tailstock body 62 is connected to the fixed plate 651 through the guide rod 652. At the same time, a strong spring 653 is sleeved on the guide rod 652. During the workpiece clamping process, the switching unit 65 is not activated. At this time, the strong spring 653 is not subjected to any external force, so the tailstock body 62 is in the initial position. At this time, there is a reserved gap between the tailstock body 62 and the inner wall of the guide groove 611. Even if the center sleeve 63 moves to the preset position, it still maintains the reserved gap with the center hole of the workpiece.

[0033] It is worth noting that a support frame is installed on the carrier 21, and this support frame does not affect the normal movement of the mounting base 23. When the center sleeve 63 is not in close contact with the workpiece material 100, the support frame supports the workpiece material 100 to prevent it from tilting due to its own weight if it is too long, which would affect the normal use of the center sleeve 63. Furthermore, since the tailstock base plate 61 is connected to the carrier 21 by a rigid adjusting screw 64, the operator only needs to adjust the spacing when processing the first piece. In subsequent batch production, the position of the tailstock base plate 61 relative to the tool holder remains constant regardless of where the carrier 21 moves. This means that when changing to different batches of bar stock with the same specifications, there is no need to find the tailstock clamping point again; the center sleeve 63 will always stop at the same small gap reserved on the workpiece end face, greatly shortening auxiliary time and improving the consistency of batch processing.

[0034] Composite turning process: When the CNC system of the machine tool issues a machining command, the power unit 5 drives the bearing seat 21 to move axially along the guide rail on the machine tool body 1, causing the turning mechanism 2 and the tailstock mechanism 6 to move synchronously to the preset machining position. At the same time, the slide rail unit 22 drives the mounting seat 23 to move the tool holder 24, which is equipped with the cutting tool body 25, radially toward the workpiece until the cutting tool body 25 reaches the preset turning start position, ready to perform turning machining on the workpiece.

[0035] During this process, as the mounting base 23 moves, the pressing plate 231 mounted on the outside of the mounting base 23 moves synchronously. When the contact and pressing degree between the inclined surface of the pressing plate 231 and the arc-shaped end face of the movable frame 658 is still in a small stage, the movable frame 658 maintains its initial position under the elastic holding force of the return spring 6571. As the mounting base 23 feeds further, the pushing action of the inclined surface of the pressing plate 231 relative to the arc-shaped end face of the movable frame 658 gradually intensifies until the pushing force is sufficient to overcome the elastic threshold of the return spring 6571, forcing the movable frame 658 to slide downward along the axial direction of the fixed rod assembly 657.

[0036] The downward movement of the movable frame 658 causes the connecting rod 656, which is hinged to it, to rotate angularly around the central axis of its corresponding pin 6561. Since one end of the connecting rod 656 is fixed to the abutment plate 655 and the other end is connected to the movable frame 658, and the connecting rod 656 can swing around the pin 6561 as a fulcrum, the linear displacement of the movable frame 658 is converted into the synchronous swing motion of the abutment plate 655.

[0037] As the two abutment plates 655 converge synchronously toward the center surface of the tailstock base plate 61, the inclined portion of the abutment plate 655 forms a rolling contact engagement with the roller 621 mounted on the outside of the tailstock body 62. The inclined surface of the abutment plate 655 continuously applies an axial thrust toward the workpiece direction to the tailstock body 62. When this thrust exceeds the preload elastic resistance of the strong spring 653, the strong spring 653 undergoes elastic deformation and is stretched. The tailstock body 62 then slides along the guide groove 611 toward the end of the workpiece until the corresponding end face of the tailstock body 62 forms a tight fit with the inner wall limiting surface of the guide groove 611. At this point, the roller 621 has passed the inclined area of ​​the abutment plate 655 and forms a surface contact engagement with the flat holding section of the abutment plate 655, thereby achieving a stable limiting and locking of the tailstock body 62.

[0038] It is worth noting that the length of the extrusion plate 231 is greater than the initial distance between the workpiece surface to be machined and the cutting tool body 25. Therefore, the aforementioned mechanical linkage and the locking action of the tailstock body 62 are completed before the cutting tool body 25 actually contacts the workpiece. When the cutting tool body 25 begins to remove material from the workpiece, the contact with the roller 621 has been switched to the planar holding section of the abutment plate 655. Even if the mounting seat 23 undergoes further minor displacement during the cutting feed, the planar section of the abutment plate 655 can still continuously apply limiting constraints to the tailstock body 62, preventing the tailstock body 62 from undergoing unexpected reset action under the restoring force of the strong spring 653, thereby ensuring that the stable holding and limiting function of the center sleeve 63 on the end of the workpiece is not affected.

[0039] Furthermore, based on the symmetrical layout of the two tool holders 24 on the mounting base 23, when the cutting tool body 25 moves towards the workpiece side with the tool holder 24 and enters the cutting interference zone, the other tool holder 24 equipped with the cutting tool body 26 simultaneously retreats to the safe avoidance zone in the direction away from the workpiece; conversely, when the cutting tool body 26 is called to move towards the workpiece, the cutting tool body 25 retreats simultaneously.

[0040] During the turning process, the tool holder 24 is driven by the slide rail unit 221 to perform two-dimensional interpolation motion along a preset trajectory, thereby driving the tool body 25 to complete the precise turning and shaping of the valve disc outline.

[0041] Valve disc cut-off process: After the turning and forming process is completed, the support seat 21 retracts along the guide rail of the machine tool body 1 to the preset safe tool changing position. At this time, the slide rail unit 22 inside the mounting seat 23 responds to the control system command and performs a lateral displacement action. The tool holder 24, which was originally in the standby avoidance state, carries the cutting tool body 26 and cuts radially into the center of the machining area. At the same time, another tool holder 24 equipped with the turning tool body 25 simultaneously retracts radially away from the cutting interference zone, completing the interference-free switching of the tool position. As the support seat 21 feeds axially again, the cutting tool body 26 continues to move towards the workpiece and performs a radial cutting and cutting action at the root of the turned valve disc until the finished valve disc is completely separated from the metal shaft material.

[0042] During the cutting feed process, the tip and body of the cutter body 26 need to penetrate into the workpiece cross-section in a direction perpendicular to the workpiece axis until the material is completely cut off. If the center sleeve 63 still occupies the axial extension space of the workpiece tail area at this time, as the cutter body 26 penetrates radially, the tool holder 24 or the cutter body is very likely to have a rigid structural collision with the conical surface or outer wall of the center sleeve 63. This can result in minor damage to the cutting edge and loss of accuracy of the center conical surface, or even cause the tool holder system to bear abnormal loads and overload deformation.

[0043] Corresponding to the movement of the cutter body 26 towards the workpiece, the pressing plate 231 mounted on the outside of the mounting base 23 and the arc-shaped end face of the movable frame 658 gradually separate. As the cutter body 26 approaches the workpiece, the contact area between the pressing plate 231 and the movable frame 658 gradually transitions from a planar holding section to an inclined section, and the degree of pushing constraint of the pressing plate 231 on the arc-shaped end face of the movable frame 658 weakens accordingly. Under the action of the elastic restoring force stored in the return spring 6571, the movable frame 658 gradually slides upward and resets along the axial direction of the fixed rod group 657. The upward movement of the movable frame 658 is transmitted through the hinged connecting rod 656, driving the two abutment plates 655 to simultaneously rotate away from the workpiece, so that the contact area between the abutment plate 655 and the outer roller 621 of the tailstock body 62 gradually transitions from a planar limiting section to an inclined release section. As a result, the axial limiting constraint force of the abutment plate 655 on the tailstock body 62 is gradually released, and the elastic potential energy accumulated by the powerful spring 653 is released, pushing the tailstock body 62 to perform a reset action along the guide groove 611, thereby driving the center sleeve 63 to simultaneously retract axially and disengage from the tail end area of ​​the workpiece. This linkage retraction mechanism provides an unobstructed radial feed path for the cutter body 26, ensuring that the subsequent cutting process can smoothly separate the machined valve disc from the workpiece material 100.

[0044] Two tool holders 24 are provided. The distance between the tool holder 24 for assembling the cutter body 26 and the axis of the workpiece material 100 is greater than the distance between the tool holder 24 for assembling the lathe tool body 25 and the axis of the workpiece material 100. This allows the cutter body 26 to move towards the workpiece material 100. Since the distance between the cutter body 26 and the workpiece material 100 is greater than the distance between the lathe tool body 25 and the workpiece material 100, this distance difference is sufficient to ensure that when the cutter body 26 moves towards the workpiece material 100 until it reaches the preset position, the extrusion plate 231 has separated from the movable frame 658, the tailstock body 62 has been reset, and thus the center sleeve 63 is separated from the workpiece material 100.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite turning machine for valve disc machining, comprising a machine tool body (1) and a turning mechanism (2) mounted on the machine tool body (1), characterized in that, The machine tool body (1) is equipped with a three-jaw chuck (4) for clamping the workpiece material (100) by a drive unit (3) set inside it. The machine tool body (1) is also equipped with a power unit (5) for adjusting the position of the turning mechanism (2). The turning mechanism (2) includes a support seat (21) that is slidably mounted on the machine tool body (1) and connected to the power unit (5). The support seat (21) is equipped with a mounting seat (23) through a slide rail unit (22) set thereon. The mounting seat (23) is equipped with a tool holder (24) through a slide rail unit (221) set thereon. There are two tool holders (24). One tool holder (24) is equipped with a turning tool body (25) for turning the outer contour of the valve disc. The other tool holder (24) is equipped with a cutting tool body (26) for cutting off the workpiece. The machine tool body (1) is also equipped with a tailstock mechanism (6) for clamping the workpiece.

2. The composite turning equipment for valve disc machining according to claim 1, characterized in that: An extrusion plate (231) is fixedly connected to the outer side of the mounting base (23), and the outer side of the extrusion plate (231) is designed with a bevel.

3. The composite turning equipment for valve disc machining according to claim 1, characterized in that: The tailstock mechanism (6) includes a tailstock base plate (61) that is slidably mounted on the machine tool body (1), and the tailstock base plate (61) is fitted with a tailstock body (62) through a guide groove (611) on its top, and a center sleeve (63) is fitted inside the tailstock body (62), the central axis of the center sleeve (63) being coaxial with the three-jaw chuck (4).

4. The composite turning equipment for valve disc machining according to claim 3, characterized in that: The tailstock base plate (61) is connected to the support seat (21) by an adjusting screw (64) disposed inside it. There are two adjusting screws (64) and they are symmetrically distributed along the center plane of the tailstock base plate (61). A scale (211) is mounted on the outer side of the support seat (21).

5. The composite turning equipment for valve disc machining according to claim 1, characterized in that: The tailstock mechanism (6) is also equipped with a switching unit (65) for adjusting the position of the tailstock body (62). The switching unit (65) includes a fixing plate (651) mounted on the tail seat base plate (61), and a guide rod (652) connected to the tail seat body (62) is slidably installed in the fixing plate (651). The guide rod (652) has two rods and is symmetrically distributed along the center plane of the fixing plate (651). A strong spring (653) is sleeved on the outer circumference of the guide rod (652).

6. A composite turning equipment for valve disc machining according to claim 5, characterized in that: The switching unit (65) further includes a fixing seat (654) fixedly installed on the tail seat base plate (61), and the fixing seat (654) has two and is symmetrically distributed along the center plane of the tail seat base plate (61). The fixing seat (654) is equipped with an abutment plate (655) that fits against the outer side of the tail seat body (62), and the outer side of the abutment plate (655) is designed with a slope.

7. A composite turning equipment for valve disc machining according to claim 6, characterized in that: The outer side of the tailstock body (62) is fitted with a roller (621) that fits against the outer side of the abutment plate (655).

8. A composite turning equipment for valve disc machining according to claim 7, characterized in that: A connecting rod (656) is mounted on the outer side of the abutment plate (655), and the connecting rod (656) is connected to the tailstock base plate (61) through a pin (6561) set inside it. A fixed rod assembly (657) is fixedly connected to the bottom of the tailstock base plate (61), and a movable frame (658) is slidably connected to the side of the connecting rod (656) away from the abutment plate (655) on the outer circumference of the fixed rod assembly (657). A return spring (6571) is sleeved on the outer circumference of the fixed rod assembly (657), and the movable frame (658) is arc-shaped on the side away from the connecting rod (656).

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