Valve body fixing device for machining center and using method
By using a fluid dynamic component with a flexible contact surface and a composite medium, the deformation problem caused by vibration and stress during valve body processing was solved, and high-frequency impact was used to eliminate residual stress, thereby improving processing accuracy and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-17
- Publication Date
- 2026-04-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing fixing devices cannot effectively eliminate microscopic warping or torsional deformation caused by high-frequency vibration and residual stress when machining valve bodies, affecting machining accuracy and hole parameters.
The fluid dynamic component employs a flexible contact surface and composite medium to eliminate residual stress in the valve body through high-frequency impact and adaptive stiffness adjustment. Combined with cooling and support functions, it achieves online stress relief.
It improves the dimensional stability and fatigue life of the valve body after machining, reduces thermal deformation, and enhances machining accuracy and rigid support.
Smart Images
Figure CN121848153A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of valve body processing equipment, and in particular to a valve body fixing device for a machining center and its usage method. Background Technology
[0002] As a core component of fluid control systems, valve bodies are widely used in petrochemical, hydraulic transmission, and aerospace industries. Their structures typically feature multi-directional hole systems, complex internal cavities, uneven wall thickness, and numerous irregularly shaped surfaces. To meet the demands of high-precision manufacturing, modern industry commonly employs CNC machining centers to perform multi-process machining of valve bodies, including milling, boring, and tapping. During machining, the workpiece must be firmly positioned and clamped to resist cutting forces and ensure the stability of the machining datum.
[0003] Currently, the machining and fixing of valve bodies mainly employs actuators such as general-purpose vises, three-jaw chucks, or dedicated hydraulic tooling fixtures to apply clamping force to the external positioning surfaces of the valve body, thereby rigidly fixing the valve body to the machine tool table. The primary goal of these fixing devices is to provide sufficient rigid support to prevent the workpiece from shifting or vibrating under the action of cutting forces.
[0004] However, under actual machining conditions, especially when large-mass cutting is performed on castings or forgings of valve bodies, the high-frequency vibration and large residual stress generated may cause microscopic warping or torsional deformation of the valve body. Existing fixing devices generally use passive rigid supports to ensure machining stability. Although this effectively limits the macroscopic displacement of the workpiece, it cannot eliminate or alleviate the stress release process that is taking place inside the workpiece in a timely manner, resulting in a large deviation in the hole system parameters after finishing. Summary of the Invention
[0005] To address the aforementioned technical problems, this application provides a valve body fixing device and its usage method for a machining center.
[0006] On the one hand, this application provides a valve body fixing device for a machining center, which adopts the following technical solution: A valve body fixing device for a machining center includes a base and multiple support units disposed on the base; The support unit includes: A support head is used to support the valve body, and the top of the support head is provided with a flexible contact surface for contacting the valve body; A support housing, located below the support head and used to provide support for the support head, has an internal receiving cavity; The fluid dynamics component, located within the receiving cavity, is used to generate corresponding volume changes in response to the vibration of the valve body during cutting. The composite medium is filled into the receiving cavity; The support head has a circulation chamber inside. The hydrodynamic component is used to drive the composite medium to circulate in the containment chamber and circulation chamber under the action of valve body vibration, and to impact the inner wall of the flexible contact surface to eliminate the residual stress generated by cutting of the valve body.
[0007] Optionally, the composite medium includes cutting fluid and impact particles, the impact particles being made of zirconium oxide or tungsten alloy, and the particle size of the impact particles being in the range of 1-1.5 mm.
[0008] Optionally, the hydrodynamic component includes a guide post located within the receiving cavity. The top of the guide post extends upward into the circulation cavity, and the bottom is connected to the base. A guide flow channel is vertically opened inside the guide post. A gap is left between the top of the guide post and the flexible contact surface, and the top opening faces the flexible contact surface to guide the impact particles to move upward.
[0009] Optionally, the fluid dynamics assembly further includes a telescopic bellows located below the support head and within the receiving cavity. The top of the telescopic bellows is fixedly connected to the support head, and the bottom is connected to the base. The inner diameter of the telescopic bellows is larger than the inner diameter of the guide post. The internal cavity of the telescopic bellows is connected to the circulation cavity. The composite medium fills the communicating cavity formed by the internal cavity of the telescopic bellows and the circulation cavity. A first one-way valve is provided at the opening below the guide post. The first one-way valve is configured to allow the composite medium to flow into the guide channel only from the telescopic bellows.
[0010] Optionally, a second check valve is connected to the outside of the telescopic bellows. The second check valve is used to connect to an external cutting fluid supply device and is configured to allow only external cutting fluid to flow into the telescopic bellows.
[0011] Optionally, a cooling pipe is provided inside the side wall of the support head. The inlet end of the cooling pipe is connected to the guide channel, and the outlet end of the cooling pipe is opened on the top surface of the support head and is inclined upward, so as to guide the cutting fluid pumped into the guide channel along with the impact particles to the supported part of the valve body.
[0012] Optionally, the top inner wall of the support head corresponding to the circulation cavity area is configured as a concave arc surface to guide the impact particles that collide with the flexible contact surface back into the telescopic bellows.
[0013] Optionally, the support housing has an annular cavity in the side wall of its upper region, the annular cavity surrounds the receiving cavity and is filled with the impact particles, and the bottom of the support head is sealed and inserted into the annular cavity and in contact with the impact particles.
[0014] Optionally, the cross-section of the annular cavity in the vertical plane is configured as a cone or trapezoid with a gradually decreasing width from top to bottom. After being pressed, the impact particles are compressed and densified in the annular cavity to provide rigid support for the support head.
[0015] On the other hand, this application also provides a method for using a valve body fixing device for a machining center, which uses the above-mentioned valve body fixing device to fix and support the valve body, including the following steps: S1: Clamping, place the valve body on the support unit, apply the main clamping force to make the support head sink, compress the composite medium in the support housing until a rigid support is formed; S2: Machining, the valve body is machined by cutting, and the vibration generated by cutting drives the fluid power component to work. The fluid power component pumps the composite medium to impact the inner wall of the flexible contact surface at the top of the support head, thereby relieving stress on the valve body online. At the same time, the internal composite medium absorbs the energy of the cutting vibration. S3: Disassembly. After the valve body is machined, it is disassembled and the next machining process is carried out.
[0016] In summary, this application includes at least one of the following beneficial effects: 1. A telescopic bellows connected to the base is used, with its top fixedly connected to the support head. The internal cavity of the telescopic bellows communicates with the circulation cavity inside the support head. A guide post is vertically positioned within the communicating cavity formed by the internal cavity of the telescopic bellows and the circulation cavity. A first one-way valve is installed at the bottom opening of the guide post to ensure that the composite medium can only flow unidirectionally from the telescopic bellows into the guide channel inside the guide post. The top opening of the guide post faces upward toward the flexible contact surface of the support head. A second one-way valve is also connected to the outside of the telescopic bellows, allowing only external cutting fluid to flow unidirectionally into the telescopic bellows. The support head can directly contact the valve body to be machined to provide support. During large-mass cutting, the valve body will generate high-frequency vibrations, which will be transmitted to the telescopic bellows through the support head, causing the telescopic bellows to periodically expand and contract. The periodic expansion and contraction of the telescopic bellows causes alternating changes in the internal cavity volume. Since the inner diameter of the telescopic bellows is much larger than that of the guide column, the effective cross-sectional area of the telescopic bellows is much larger than that of the guide column. According to the continuity equation of fluid mechanics, the flow velocity of the composite medium in the guide column will be several times greater than that in the telescopic bellows. According to the relationship between velocity and kinetic energy, the composite medium can be significantly accelerated in the guide column. As a result, the impact particles in the composite medium indirectly impact the outer wall of the valve body at high frequency through high-speed impact on the inner wall of the flexible contact surface. This high-frequency impact excites high-frequency elastic waves inside the metal valve body. This dynamic stress wave superimposed on the residual stress field inside the valve body can promote the microscopic slip and rearrangement of unstable dislocations in the metal lattice, thereby effectively releasing local stress concentration and improving the dimensional stability and fatigue life of the valve body after processing. 2. By opening an annular cavity in the top side wall of the support housing and filling the annular cavity with impact particles, the bottom of the support head is sealed and inserted into the annular cavity and in contact with the impact particles. The impact particles can provide support for the support head. Since the cross-section of the annular cavity in the vertical plane is configured as a cone or trapezoid with a gradually decreasing width from top to bottom, when the support head is pressed down by the valve body, the support head will press down on the impact particles. After being compressed, the impact particles gradually gather and compact towards the bottom in the cone-shaped annular cavity, and the porosity between the particles gradually decreases, resulting in a nonlinear increase in the overall stiffness of the particle layer. This can provide rigid support for the valve body while also providing adaptive stiffness reinforcement when the cutting load of the valve body increases. Thus, it can effectively suppress valve body deformation in the roughing stage and avoid the transmission of micro-vibrations caused by excessive stiffness in the finishing stage. 3. Part of the cutting fluid pressed into the guide column in the composite medium will be sprayed upwards through the cooling pipe onto the clamped surface of the valve body, achieving precise cooling of the clamping area and reducing the thermal deformation of the valve body caused by cutting heat. Attached Figure Description
[0017] Figure 1 This is a schematic diagram illustrating the working principle of the valve body fixing device in Embodiment 1 of this application; Figure 2 This is a structural schematic diagram illustrating the installation position of the support unit in Embodiment 1 of this application; Figure 3 This is a schematic diagram illustrating the overall structure of the support unit in an embodiment of this application; Figure 4 This is a cross-sectional schematic diagram illustrating the internal structure of the support unit in Embodiment 1 of this application; Figure 5 This is a cross-sectional schematic diagram illustrating the working principle of the support unit in Embodiment 1 of this application.
[0018] Explanation of reference numerals in the attached drawings: 1. Base; 11. Mounting hole; 2. Support unit; 21. Support head; 211. First support part; 212. Second support part; 213. Circulation chamber; 214. Cooling pipe; 22. Support shell; 221. Receiving cavity; 222. Annular cavity; 23. Fluid dynamics component; 231. Guide column; 232. Telescopic bellows; 233. Guide flow channel; 24. Flexible contact surface; 25. Impact particle; 26. Connecting ring; 27. First check valve; 28. Second check valve; 3. Valve body. Detailed Implementation
[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.
[0020] Example 1
[0021] Embodiment 1 of this application discloses a valve body fixing device for a machining center, see reference... Figure 1 and Figure 2 The valve body fixing device for the machining center includes a base 1 mounted on the machining center machine tool and multiple support units 2 set on the base 1. The support units 2 are used to contact the valve body 3 and provide stable support for the valve body 3. The specific number of support units 2 can be optimized according to the actual size and weight distribution of the valve body 3. The support units 2 and the base 1 are detachably connected. The detachable connection method is preferably bolt connection. The surface of the base 1 is provided with mounting holes 11 that correspond one-to-one with the support units 2. After the support units 2 are aligned with the mounting holes 11 on the base 1, they can be quickly assembled, disassembled and accurately positioned by tightening bolts.
[0022] In this embodiment, the inlet and outlet faces of the valve body 3 are vertically positioned, while the valve cover openings on the sidewalls are arranged horizontally to facilitate drilling holes in the valve body 3 faces or rough machining of the valve body 3 holes with a large allowance. Therefore, the base 1 includes a horizontally positioned main body and side wing plates vertically positioned corresponding to the valve cover opening faces. The side wing plates can have through slots corresponding to the valve cover openings to avoid machining tools and ensure unobstructed lateral machining paths. Support units 2 are respectively arranged on the top surface of the main body and the inner surface of the side wing plates, forming a three-dimensional constraint system. A clamping mechanism (not shown) independent of the base 1 is also provided on the machining center. The clamping mechanism can drive the pressure head to clamp the valve body 3 face or sidewalls by hydraulic or pneumatic means to achieve uniform force application at multiple points.
[0023] For example, refer to Figures 2 to 5 The support unit 2 includes a support head 21, a support housing 22, and a fluid power component 23 and a composite medium disposed inside the support housing 22. The support head 21 is located at the top of the support housing 22 and is used to directly contact the valve body 3. The bottom of the support housing 22 is detachably connected to the base 1 by bolts. Both the support head 21 and the support housing 22 have cavities inside to accommodate the fluid power component 23 and the composite medium.
[0024] In some embodiments, the support head 21 includes an integrally formed first support portion 211 and a second support portion 212. The first support portion 211 is located above the second support portion 212, and the first support portion 211 and the second support portion 212 together form a double-stage load-bearing structure in the form of a boss in the support head 21. A circulation cavity 213 is opened inside the support head 21, penetrating the first support portion 211 and the second support portion 212. A flexible contact surface 24 is embedded in the top center area of the first support portion 211. The flexible contact surface 24 is preferably made of a titanium alloy sheet with a thickness of 0.8-1mm, so that the flexible contact surface 24 has the characteristics of high strength and low elastic modulus, which can maintain a large and stable contact surface with the surface of the valve body 3 when supporting the valve body 3. The flexible contact surface 24 covers and seals the upper opening of the circulation cavity 213, so that the first support portion 211, the second support portion 212 and the flexible contact surface 24 together form a chamber structure of the support head 21 that is sealed at the top and open at the bottom.
[0025] Furthermore, the support housing 22 is cylindrical in shape, and a receiving cavity 221 is coaxially formed inside the support housing 22. The receiving cavity 221 is connected to the circulation cavity 213 of the support head 21. At the same time, an annular cavity 222 is formed in the side wall of the upper region of the support housing 22. The annular cavity 222 is arranged around the receiving cavity 221 and is independent of the receiving cavity 221. The bottom of the second support part 212 is inserted into the annular cavity 222 and is sealed to the support housing 22. The annular cavity 222 is filled with impact particles 25. The second support part 212 presses down on the impact particles 25 in the annular cavity 222 from the top. To provide stable support for the second support portion 212, the annular cavity 222 is filled with impact particles 25. The gaps between the impact particles 25 within the annular cavity 222 are small. The impact particles 25 are preferably microparticles made of zirconia ceramic or tungsten alloy. Furthermore, the impact particles 25 can employ a two-stage particle size ratio, i.e., large particles and small particles are mixed and filled in a volume ratio, for example, large particles account for 60%–70%, while small particles fill the gaps. This ratio can increase the density of the impact particles 25 when stacked, thereby enhancing the overall rigidity of the impact particles 25 within the annular cavity 222 when compressed. In this embodiment, the particle size of the large particles in the impact particles 25 is preferably in the range of 1-1.5 mm, and the particle size of the small particles is approximately 1 / 3–1 / 2 the size of the large particles, which facilitates the small particles fully filling the gaps between the large particles.
[0026] In some embodiments, in order to further enhance the rigid support of the support head 21, the cross-section of the annular cavity 222 in the vertical plane is configured as a cone or trapezoid with a width that gradually decreases from top to bottom. In the embodiments of this application, a trapezoidal cross-section is preferred.
[0027] Understandably, the impact particles 25 are filled in the annular cavity 222 with a trapezoidal cross-section that is wider at the top and narrower at the bottom. When the second support 212 applies downward pressure, the impact particles 25 are squeezed and slide inward and downward along the cavity wall and lock together. The porosity between the particles gradually decreases, and the impact particles 25 are gradually compressed and densed, forming a self-reinforcing radial constraint force and vertical support force. That is, the greater the downward pressure on the support head 21, the denser the impact particles 25 are compressed, and the stronger the radial constraint force and vertical support force become. This achieves dynamic adaptive stiffness adjustment, which can provide rigid support for the valve body 3 while also providing adaptive stiffness reinforcement when the cutting load of the valve body 3 increases. This nonlinear response support characteristic effectively buffers the high-frequency vibration impact of the valve body 3 caused by large-margin cutting.
[0028] In some embodiments, the hydrodynamic assembly 23 includes a guide post 231 and a telescopic bellows 232, wherein the telescopic bellows 232 is coaxially disposed within the receiving cavity 221 of the support housing 22, and a gap is left between the telescopic bellows 232 and the inner wall of the support housing 22. The top of the telescopic bellows 232 is sealed to the bottom of the first support part 211 through a connecting ring 26, and the bottom is sealed to the top surface of the base 1. The connecting ring 26 can transmit the vibration displacement of the support head 21 to the telescopic bellows 232, and the internal cavity of the telescopic bellows 232 is connected to the circulation cavity 213 inside the support head 21 through the connecting ring 26. The guide post 231 is vertically and coaxially placed inside the telescopic bellows 232. The top of the guide post 231 extends upward into the circulation cavity 213 of the support head 21, while the bottom is fixedly connected to the base 1. A guide flow channel 233 is vertically opened inside the guide post 231. A gap is left between the top of the guide post 231 and the flexible contact surface 24, and the top opening of the guide post 231 faces upward toward the inner wall of the flexible contact surface 24.
[0029] Furthermore, the inner diameter of the telescopic bellows 232 is several times larger than the inner diameter of the guide post 231 and the guide channel 233. In this embodiment, the inner diameter of the telescopic bellows 232 is at least 5 times the diameter of the guide channel 233, thereby ensuring that the telescopic bellows 232 can produce significant axial deformation and volume change when the support head 21 undergoes a small displacement. The sealed cavity formed by the internal cavity of the telescopic bellows 232 and the circulation cavity 213 is filled with a composite medium, which is a mixture of cutting fluid and impact particles 25. The impact particles 25 have the same composition as the impact particles 25 in the annular cavity 222, and the cutting fluid is the same type of cutting fluid used in the valve body 3 machining process. The filling amount of the composite medium is controlled at 65% to 75% of the volume of the annular cavity 222, and the liquid level of the composite medium is located below the top opening of the guide post 231.
[0030] In some embodiments, a first check valve 27 is installed at the opening below the guide post 231. The first check valve 27 is configured to allow only the composite medium to flow into the guide channel from the telescopic bellows 232. Simultaneously, a second check valve 28 is installed on the outer wall of the support housing 22. The second check valve 28 is connected to the internal cavity of the telescopic bellows 232 via a flexible hose and can be connected to an external cutting fluid supply device. The second check valve 28 is configured to allow only external cutting fluid to flow into the telescopic bellows 232. Both the first check valve 27 and the second check valve 28 can be ball valves, i.e., a one-way structure consisting of a sealing ball and a weak-stiffness spring.
[0031] Understandably, after the valve body 3 is installed on the fixing device, when the valve body 3 is performing large-mass cutting, the valve body 3 and the tool will have a violent impact under high-intensity cutting conditions, and the valve body 3 will vibrate. Since the support head 21 is in direct contact with the valve body 3, the vibration generated by the valve body 3 will be transmitted to the support head 21, and then transmitted to the telescopic bellows 232 through the connecting ring 26, causing the telescopic bellows 232 to perform periodic axial expansion and contraction. The periodic expansion and contraction of the telescopic bellows 232 will cause the internal cavity volume to change alternately. When the telescopic bellows 232 extends axially, the internal cavity volume of the telescopic bellows 232 increases, resulting in a decrease in the internal pressure of the telescopic bellows 232. At this time, the first one-way valve 27 closes and the second one-way valve 28 opens, allowing external cutting fluid to be drawn into the telescopic bellows 232 through the second one-way valve 28. When the telescopic bellows 232 compresses axially, the internal cavity volume of the telescopic bellows 232 decreases, resulting in an increase in the internal pressure of the telescopic bellows 232. At this time, the second one-way valve 28 closes and the first one-way valve 27 opens, allowing the composite medium to be pumped upwards at high speed into the circulation chamber 213 through the guide channel 233. The impact particles 25 are ejected at high speed along with the composite medium and then impact the flexible contact surface 24. They impact the position where the valve body 3 is clamped through the flexible contact surface 24, then bounce back and fall back into the composite medium, completing the circulation. For this purpose, the top inner wall of the support head 21 corresponding to the circulation cavity 213 region is configured as a concave arc surface to guide the impact particles 25 that collide with the flexible contact surface 24 back into the telescopic bellows 232.
[0032] Since the inner diameter of the telescopic bellows 232 is much larger than the inner diameter of the guide post 231, specifically, the inner diameter of the telescopic bellows 232 is at least 5 times the diameter of the guide channel 233, that is, the effective cross-sectional area of the telescopic bellows 232 is at least 25 times the cross-sectional area of the guide channel 233 in the guide post 231. According to the continuity equation of fluid mechanics, namely Pascal's principle, the flow velocity of the composite medium in the guide post 231 will be several times greater than the flow velocity in the telescopic bellows 232. According to the relationship between velocity and kinetic energy, the composite medium can be significantly accelerated in the guide post 231. As a result, the impact particles 25 in the composite medium indirectly impact the outer wall of the valve body 3 at high frequency through high-speed impact on the inner wall of the flexible contact surface 24. Unlike the stress relief methods of traditional shot peening, this high-frequency impact excites high-frequency elastic waves inside the metal valve body 3. The superposition of this dynamic stress wave with the residual stress field inside the valve body 3 can induce microscopic slip and rearrangement of unstable dislocations in the metal lattice. It does not require huge energy to deform the valve body 3, but only high-frequency vibration energy to induce microscopic lattice adjustment inside the valve body 3, thereby effectively releasing local stress concentration and improving the dimensional stability and fatigue life of the valve body 3 after processing.
[0033] In some embodiments, a cooling pipe 214 is inserted into the side wall of the first support 211. The cooling pipe 214 is preferably a flexible hose. The inlet end of the cooling pipe 214 is inserted into the guide post 231 and connected to the guide channel 233. A filter screen is installed inside the inlet end of the cooling pipe 214. The mesh diameter of the filter screen is smaller than the outer diameter of the impact particle 25, which can prevent the impact particle 25 from entering the cooling pipe 214. The outlet end of the cooling pipe 214 is opened on the top surface of the support head 21 and is inclined upward. Multiple cooling pipes 214 can be provided as needed. Multiple cooling pipes 214 are distributed at intervals around the flexible contact surface 24. The top surface of the first support 211 is provided with a clearance countersunk hole. The outlet end of the cooling pipe 214 extends from the side wall of the first support 211 corresponding to the clearance countersunk hole, so that the cutting fluid sprayed from the cooling pipe 214 can be directly sprayed onto the supported part of the valve body 3.
[0034] Understandably, a portion of the cutting fluid pressed into the guide column 231 in the composite medium will be sprayed upwards through the cooling pipe 214 onto the clamped surface of the valve body 3. Meanwhile, the impact particles 25 in the composite medium are intercepted by the filter screen and continue to reciprocate within the circulation chamber 213 with the composite medium. The sprayed cutting fluid forms a uniform cooling film on the clamped surface of the valve body 3, which both removes machining heat and lubricates the contact interface, achieving precise cooling of the clamping area and reducing thermal deformation of the valve body 3 caused by cutting heat.
[0035] The implementation principle of a valve body fixing device for a machining center according to an embodiment of this application is as follows: When the valve body 3 is cut, the micro-amplitude vibration generated by the cutting force is transmitted to the support head 21. The support head 21 transmits the vibration to the telescopic bellows 232 through the connecting ring 26. The telescopic bellows 232 converts the vibration into reciprocating elastic deformation in the vertical axis, thereby causing periodic changes in the pressure inside the cavity of the telescopic bellows 232. When the telescopic bellows 232 extends, it can draw external cutting fluid into the telescopic bellows 232. When the telescopic bellows 232 contracts, it can pump the internal composite medium into the guide channel 233 in the guide column 231. The high-speed impact particles 25 ejected from the guide channel 233 impact the flexible contact surface 24, thereby generating knocking vibration on the clamping surface of the valve body 3 through the flexible contact surface 24, thereby performing high-frequency micro-vibration aging treatment on the valve body 3, and simultaneously exciting the dynamic relaxation of the internal lattice of the valve body 3, so as to effectively and timely eliminate the stress generated by the cutting of the valve body 3.
[0036] Example 2
[0037] Embodiment 2 of this application discloses a method for using a valve body fixing device for a machining center, which uses the above-mentioned valve body 3 fixing device to fix and support the valve body 3, including the following steps: S1: Clamping, placing the valve body 3 on the support unit 2, applying the main clamping force, causing the support head 21 to sink, compressing the impact particles 25 in the support housing 22 until a rigid support is formed; S2: Machining, the valve body 3 is machined by cutting, and the vibration generated by cutting drives the fluid power component 23 to work. Specifically, the telescopic bellows 232 periodically expands and contracts, and the composite medium is pumped into the guide channel 233 in the guide column 231. The high-speed impact particles 25 ejected from the guide channel 233 impact the flexible contact surface 24, and then generate knocking vibration on the clamping surface of the valve body 3 through the flexible contact surface 24, thereby performing high-frequency micro-vibration aging treatment on the valve body 3 and eliminating stress in the valve body 3 online. At the same time, the internal composite medium absorbs the cutting vibration energy. S3: Disassembly. After the valve body 3 is machined, it is disassembled and the next machining process is carried out.
[0038] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0039] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.
[0040] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.
Claims
1. A valve body fixing device for a machining center, characterized in that: It includes a base (1) and multiple support units (2) disposed on the base (1); Support unit (2) includes: The support head (21) is used to support the valve body (3), and the top of the support head (21) is provided with a flexible contact surface (24) for contacting the valve body (3). The support housing (22) is located below the support head (21) and is used to provide support for the support head (21). The support housing (22) has a receiving cavity (221) inside. The fluid power component (23) is located in the receiving cavity (221) and is used to generate corresponding volume changes in response to the vibration of the valve body (3) during cutting; The composite medium is filled into the receiving cavity (221); The support head (21) has a circulation chamber (213) inside. The fluid power component (23) is used to drive the composite medium to circulate in the containment chamber (221) and circulation chamber (213) under the vibration of the valve body (3), and impact the inner wall of the flexible contact surface (24) to eliminate the residual stress generated by the cutting of the valve body (3).
2. The valve body fixing device for a machining center according to claim 1, characterized in that: The composite medium includes cutting fluid and impact particles (25). The impact particles (25) are made of zirconium oxide or tungsten alloy and have a particle size of 1-1.5 mm.
3. The valve body fixing device for a machining center according to claim 2, characterized in that: The fluid dynamics assembly (23) includes a guide post (231) located in the receiving cavity (221). The top of the guide post (231) extends upward into the circulation cavity (213), and the bottom is connected to the base (1). A guide channel (233) is vertically opened inside the guide post (231). The top of the guide post (231) has a gap with the flexible contact surface (24), and the top opening faces the flexible contact surface (24) to guide the impact particles (25) to move upward.
4. The valve body fixing device for a machining center according to claim 3, characterized in that: The fluid dynamics assembly (23) also includes a telescopic bellows (232), which is located below the support head (21) and inside the receiving cavity (221). The top of the telescopic bellows (232) is fixedly connected to the support head (21), and the bottom is connected to the base (1). The inner diameter of the telescopic bellows (232) is larger than the inner diameter of the guide post (231). The internal cavity of the telescopic bellows (232) is connected to the circulation cavity (213). The composite medium is filled in the communicating cavity formed by the internal cavity of the telescopic bellows (232) and the circulation cavity (213). A first one-way valve (27) is provided at the opening below the guide post (231). The first one-way valve (27) is configured to allow the composite medium to flow into the guide channel from the telescopic bellows (232).
5. The valve body fixing device for a machining center according to claim 4, characterized in that: The telescopic bellows (232) is externally connected to a second check valve (28), which is used to connect to an external cutting fluid supply device. The second check valve (28) is configured to allow only external cutting fluid to flow into the telescopic bellows (232).
6. The valve body fixing device for a machining center according to claim 4, characterized in that: The support head (21) has a cooling pipe (214) inside its side wall. The inlet end of the cooling pipe (214) is connected to the guide channel (233). The outlet end of the cooling pipe (214) is opened on the top surface of the support head (21) and is inclined upwards. It is used to guide the cutting fluid pumped into the guide channel (233) along with the impact particles (25) to the supported part of the valve body (3).
7. The valve body fixing device for a machining center according to claim 6, characterized in that: The top inner wall of the support head (21) corresponding to the circulation chamber (213) area is configured as a concave arc surface to guide the impact particles (25) that collide with the flexible contact surface (24) to flow back into the telescopic bellows (232).
8. The valve body fixing device for a machining center according to claim 2, characterized in that: The support housing (22) has an annular cavity (222) in the side wall of its upper region. The annular cavity (222) surrounds the receiving cavity (221) and is filled with the impact particles (25). The bottom of the support head (21) is sealed and inserted into the annular cavity (222) and is in contact with the impact particles (25).
9. The valve body fixing device for a machining center according to claim 8, characterized in that: The cross-section of the annular cavity (222) in the vertical plane is configured as a cone or trapezoid with a gradually decreasing width from top to bottom. After being pressed, the impact particles (25) are compressed and compacted in the annular cavity (222) to provide rigid support for the support head (21).
10. A method of using a valve body fixing device for a machining center, characterized in that: The valve body is fixedly supported using the valve body fixing device for machining centers as described in any one of claims 1-9, comprising the following steps: S1: Clamping, place the valve body (3) on the support unit (2), apply the main clamping force to make the support head (21) sink down and compress the composite medium in the support housing (22) until a rigid support is formed; S2: Machining, the valve body (3) is machined by cutting, and the vibration generated by cutting is used to drive the fluid power component (23) to work. The fluid power component (23) pumps the composite medium to impact the inner wall of the flexible contact surface (24) at the top of the support head (21) to relieve the stress of the valve body (3) online. At the same time, the internal composite medium absorbs the energy of the cutting vibration. S3: Disassembly. After the valve body (3) is cut and machined, disassemble it and proceed to the next machining step.