Valve bore machining methods, machining equipment, and high-pressure rotary valves

Abstract

This application relates to the field of valve hole processing technology, and discloses a valve hole processing method, processing equipment, and a high-pressure rotary valve. The method includes: using a drilling mechanism to pre-drill blind holes on a rotary valve head; using a grinding mechanism to grind the working surface of the rotary valve head to process the blind holes into valve holes connecting the non-working surface and the working surface of the rotary valve head; and using a rounding mechanism to round the orifice wall of the valve hole to process the orifice wall shape into a rounded structure with a target angle value and achieving a first target surface finish. The embodiments of this application can efficiently remove undesirable features generated on the orifice wall during the processing of valve holes in batches.

Description

Technical Field

[0001] This application relates to the field of valve hole processing technology, and in particular to a valve hole processing method, processing equipment, and a high-pressure rotary valve. Background Technology

[0002] When high-pressure rotary valves are used for high-pressure liquid separation, the valve head and valve core are in high-pressure contact and rotate relative to each other inside the valve. If the orifice wall of the valve head used to house the valve core has burrs or sharp edges, the metal valve head can easily scratch the wear-resistant valve core. Therefore, the machining quality of the orifice wall of the rotary valve head directly affects the performance and lifespan of the high-pressure rotary valve. However, after the valve orifice is machined, fine deposits remain on the orifice wall. These deposits cannot be removed during grinding, polishing, and cleaning, leading to burrs or sharp edges on the orifice wall. Furthermore, due to the small diameter of the orifice, these defects can only be removed manually under a microscope, resulting in low processing efficiency and an inability to guarantee high yield in batches. Summary of the Invention

[0003] The purpose of this application is to provide a valve hole processing method, processing equipment, and high-pressure rotary valve, which can efficiently remove undesirable features generated on the orifice wall of the valve hole during the processing in batches.

[0004] This application provides a valve hole machining method, including:

[0005] A drilling mechanism is used to pre-drill blind holes on the rotary valve head; the blind holes are obtained by opening from the non-working surface of the rotary valve head toward the working surface.

[0006] A grinding mechanism is used to grind the working surface of the rotary valve head to process the blind hole into a valve hole that connects the non-working surface and the working surface of the rotary valve head;

[0007] A rounding mechanism is used to round the orifice wall of the valve hole, so as to process the orifice wall into a rounded structure with a target angle value and a first target surface finish.

[0008] In some embodiments, the pre-drilling of blind holes on the rotary valve head includes:

[0009] The rotary valve head is fixed at the drilling station, driving the tool of the drilling mechanism to drill from the non-working surface toward the working surface. During the drilling process, the tool is periodically fed and chips are removed until the distance between the blind hole and the working surface reaches the target blind hole distance. The tool feed speed of the drilling mechanism is 100 mm / min, and the target blind hole distance is 0.11 mm to 0.15 mm.

[0010] In some embodiments, the grinding of the working surface of the rotary valve head includes:

[0011] The rotary valve head is conveyed to the grinding station, driving the grinding mechanism to perform periodic gradient feed grinding and cooling on the working surface. During the grinding process, cleaning fluid is introduced into the working surface to clean the generated adhesive. The grinding feed amount of the single gradient feed grinding is 0.005mm, 0.003mm and 0.003mm respectively.

[0012] In some embodiments, the rounding of the orifice wall of the valve hole includes:

[0013] The rotary valve head is conveyed to the polishing station, driving the rounding mechanism to use a polishing abrasive to round the orifice wall of the valve hole; the polishing abrasive is made of a blended material, the polishing abrasive is replaced at a frequency of 90 pcs / h, the rounding processing time is 25 min, the target angle value is not less than 40°, and the first target surface finish is... .

[0014] In some embodiments, prior to rounding the orifice wall of the valve hole, the method further includes:

[0015] A cleaning mechanism is used to perform high-pressure pulse cleaning on the inner wall and orifice wall of the valve orifice, so that the inner wall and orifice wall of the valve orifice are free of burrs and adhesions; the cleaning fluid flow rate of the high-pressure pulse cleaning is 300 ml / min, the cleaning frequency of the high-pressure pulse cleaning is 0.25 Hz and 0.5 Hz alternating, and the cleaning pressure of the high-pressure pulse cleaning is 1.2 MPa.

[0016] In some embodiments, prior to rounding the orifice wall of the valve hole, the method further includes:

[0017] A polishing mechanism is used to polish the working surface to achieve a target flatness and a second target surface finish. The polishing axial speed is 200 rad / min, the polishing time is 15 minutes, and a diamond polishing slurry is used. The second target surface finish... The flatness of the target is 0.005 mm.

[0018] In some embodiments, the valve hole machining method further includes:

[0019] An inspection mechanism is used to inspect the angle and surface finish of the valve hole after rounding. The angle inspection value is compared with a preset angle range, and the surface finish inspection value is compared with a preset surface finish range to obtain the corresponding angle inspection results and surface finish inspection results.

[0020] In some embodiments, the diameter of the valve orifice is no greater than 0.5 mm, the cross-sectional shape of the valve orifice is elliptical, and the included angle between the valve orifice and the working surface is 50° to 70°.

[0021] This application embodiment also provides a valve hole processing device, including:

[0022] A drilling mechanism is used to pre-drill blind holes on a rotary valve head; the blind holes are formed from the non-working surface of the rotary valve head toward the working surface.

[0023] A grinding mechanism is used to grind the working surface of the rotary valve head to process the blind hole into a valve hole that connects the non-working surface and the working surface of the rotary valve head;

[0024] The rounding mechanism is used to perform rounding and polishing on the orifice wall of the valve hole, so as to process the orifice wall into a rounded structure with a target curvature value and target smoothness.

[0025] This application also provides a high-pressure rotary valve, including a rotary valve head, wherein the valve orifice of the rotary valve head is processed by the above-described valve orifice processing method.

[0026] The beneficial effects of this application are as follows: The process of machining valve holes is decomposed into two stages: pre-drilling blind holes from the non-working surface towards the working surface using a drilling mechanism, and grinding the working surface using a grinding mechanism to drill through the blind holes into valve holes. This avoids the sudden stress change at the moment of penetration and creates favorable conditions for subsequent rounding. It can largely eliminate the initial formation of large-sized adhesives and burrs on the valve hole orifice wall. The rounding mechanism shapes the valve hole orifice wall to a rounded structure with the target angle value and achieving the first target surface finish, further eliminating small-sized adhesives and burrs formed during machining. This efficiently removes undesirable features generated during the machining process in batches. High-pressure rotary valves machined using this valve hole machining method have no visible burrs, sharp edges, adhesives, or impurities. Attached Figure Description

[0027] Figure 1 This is a flowchart of the valve hole processing method provided in the embodiments of this application.

[0028] Figure 2 This is a rendering of the pre-drilled blind hole on the rotary valve head provided in the embodiment of this application.

[0029] Figure 3 This is a diagram showing the effect of grinding the working surface of a rotary valve head according to an embodiment of this application.

[0030] Figure 4This is an illustration showing the effect of rounding the corners of the valve orifice according to an embodiment of this application.

[0031] Figure 5 This is a diagram illustrating the effect of high-pressure pulse cleaning of the valve orifice provided in an embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the valve hole processing equipment provided in the embodiments of this application.

[0033] Figure 7 This is a rendering of a valve hole processed using existing valve hole processing methods.

[0034] Figure 8 This is a rendering of a valve hole processed by the valve hole processing method of this application embodiment.

[0035] Figure 9 This is a diagram showing the effect of a valve hole processed using existing valve hole processing methods after use.

[0036] Figure 10 This is a diagram showing the effect of a valve hole processed by the valve hole processing method of this application after use.

[0037] Figure 11 This is a diagram showing the scratch effect of a valve hole processed using existing valve hole processing methods.

[0038] Figure 12 This is a scratch effect diagram of a valve hole processed by the valve hole processing method of the present application embodiment.

[0039] Figure 13 This is an image showing the burr effect of a valve hole processed using existing valve hole processing methods.

[0040] Figure 14 This is a burr effect diagram of a valve hole processed by the valve hole processing method of the present application embodiment. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0042] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and drawings are used to distinguish similar objects and are not used to describe a specific order or sequence.

[0043] 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 belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0044] Figure 1 This is a flowchart of the valve hole processing method provided in the embodiments of this application. (See attached document.) Figure 1 In some embodiments, the method includes, but is not limited to, steps S101 to S103.

[0045] Step S101: A drilling mechanism is used to pre-drill blind holes on the rotary valve head.

[0046] The blind hole is created by opening it from the non-working surface of the rotary valve head towards the working surface.

[0047] A drilling mechanism refers to a drilling device with axial feed function. It can be a drilling system driven by a servo motor, and blind hole pre-fabrication is achieved by controlling the tool path. Preferably, a five-axis machining center is used as the drilling mechanism.

[0048] In step S102, a grinding mechanism is used to grind the working surface of the rotary valve head to process the blind hole into a valve hole that connects the non-working surface and the working surface of the rotary valve head.

[0049] The grinding mechanism refers to a precision grinding machine equipped with a cooling system, which removes material through the relative motion between the grinding wheel and the rotating valve head. Preferably, a surface grinder is used as the grinding mechanism.

[0050] Step S103: A rounding mechanism is used to round the corners of the valve hole so that the shape of the hole wall is processed into a rounded structure with a target angle value and a first target surface finish.

[0051] A rounding mechanism refers to a processing device with flexible polishing components, such as a pneumatically controlled rotary grinding head, used for shaping the curvature of the edges of holes. Preferably, the rounding mechanism is a vertical polishing machine tool.

[0052] In the pre-drilling blind hole stage, the drilling depth of the drilling mechanism is controlled, starting from the non-working surface of the rotating valve head and moving towards the working surface, while retaining a thin layer of material on the working surface side as a subsequent grinding allowance. In the working surface grinding stage, a progressive grinding removal method is used by the grinding mechanism to remove residual material at the end of the blind hole while ensuring the flatness of the working surface. This progressive grinding removal method can largely eliminate the initial formation of large-sized deposits and burrs on the valve hole orifice wall. In the rounding stage, a rounding mechanism uses a flexible contact method to shape the valve hole orifice wall, machining it into a rounded structure with the target angle value and achieving the first target surface finish, thereby eliminating small-sized deposits and burrs formed during processing. Therefore, the process of machining valve holes is decomposed into two stages: pre-drilling blind holes from the non-working surface to the working surface using a drilling mechanism, and grinding the working surface using a grinding mechanism to drill the blind holes into valve holes. This avoids the stress change at the moment of penetration and creates favorable conditions for subsequent rounding. It can largely eliminate the initial generation of large-sized adhesives and burrs on the valve hole orifice wall. By machining the shape of the valve hole orifice wall into a rounded structure with the target angle value and the first target surface finish using a rounding mechanism, small-sized adhesives and burrs formed during the machining process can be further eliminated, and the undesirable features generated on the valve hole orifice wall during the machining process can be removed in batches efficiently.

[0053] In some embodiments, pre-drilling blind holes on a rotary valve head includes: fixing the rotary valve head to a drilling station, driving the cutting tool of a drilling mechanism to drill from a non-working surface toward a working surface, periodically feeding the cutting tool and removing chips during the drilling process, until the distance between the blind hole and the working surface reaches the target blind hole distance. The cutting tool feed rate of the drilling mechanism is 100 mm / min, and the target blind hole distance is 0.11 mm to 0.15 mm.

[0054] The drilling station refers to the machining platform used to fix the rotary valve head and perform drilling operations. This can be achieved using a hydraulic clamp with locating pins, ensuring the rotary valve head maintains a stable posture during machining. Periodic feed refers to controlling the tool's feed action in an intermittent motion manner. This can be achieved using a servo motor driving a ball screw mechanism, which avoids heat buildup from continuous cutting. The target blind hole distance refers to the reserved thickness between the bottom of the blind hole and the working surface. This can be monitored in real-time by a displacement sensor to check the drilling depth. This parameter setting prevents the tool from penetrating the working surface, which could lead to large-sized adhesive residue and burrs forming on the valve hole's orifice wall.

[0055] In the pre-drilling blind hole stage, after the rotary valve head is clamped in the drilling station, the drilling mechanism's tool performs drilling operations axially at a preset speed. After each stroke, the tool pauses briefly to remove chips and simultaneously flushes the cutting area with coolant. When the displacement detection system detects that the blind hole depth has reached the target value, the drilling mechanism's tool immediately stops feeding and returns to its initial position. For example, controlling the tool feed rate within 100 mm / min keeps the cutting force within a reasonable range, preventing plastic deformation of the material. Thus, through the periodic feeding operation of the drilling mechanism combined with the forced chip removal mechanism, chips in the machining area can be effectively removed. Simultaneously, the target blind hole distance ensures a uniform allowance layer between the bottom of the blind hole and the working surface, providing a controllable machining reference for subsequent grinding processes after eliminating the initial formation of large-sized deposits and burrs on the valve hole orifice wall. The effect of pre-drilling blind holes on the rotary valve head is as follows. Figure 2 As shown.

[0056] In some embodiments, grinding the working surface of the rotary valve head includes: conveying the rotary valve head to a grinding station, driving a grinding mechanism to perform periodic gradient feed grinding and cooling on the working surface, and introducing cleaning fluid into the working surface during the grinding process to clean the generated adhesive residue. The grinding feed amounts for a single gradient feed grinding are 0.005 mm, 0.003 mm, and 0.003 mm, respectively.

[0057] Periodic gradient feed grinding refers to machining by gradually reducing the grinding depth in stages. This can be achieved using the axial displacement control system of a CNC machine tool, reducing material stress concentration by decreasing the cutting depth in stages. Cooling treatment involves simultaneously injecting cooling medium during the grinding process, which can be achieved using a circulating coolant spray device. This reduces the temperature in the grinding zone and prevents thermal deformation of the material.

[0058] During the grinding stage of the working surface, the rotary valve head is fixed in the grinding station, and the grinding mechanism performs periodic gradient feed grinding. Each gradient feed grinding is carried out in three axial feeds according to a preset gradient, with the feed amount gradually decreasing each time. During each feed, coolant is continuously injected into the grinding area of ​​the working surface to control the temperature, while cleaning fluid is sprayed onto the working surface through pipelines to flush out the metal chips and adhering materials generated during grinding. For example, the initial feed amount can be 0.005mm to remove most of the remaining material, and the subsequent two feed amounts are adjusted to 0.003mm for fine finishing. In this process, the synchronous action of coolant and cleaning fluid can prevent the material from overheating and keep the machined surface clean. Thus, by reducing cutting resistance through a gradient feed method, combined with the dual effects of cooling and cleaning, secondary adhesion of chips is effectively avoided, machining residues can be removed simultaneously during the grinding stage, eliminating the conditions for burr formation on the valve hole orifice wall, ensuring that the working surface reaches the predetermined flatness before subsequent rounding, thereby improving the valve hole machining yield and reducing manual finishing processes. The effect of grinding the working surface of the rotary valve head is as follows Figure 3 As shown.

[0059] In some embodiments, rounding the orifice wall of the valve hole includes: conveying a rotary valve head to a polishing station, and driving a rounding mechanism to round the orifice wall of the valve hole using a polishing abrasive. The polishing abrasive is made of a blended material, the polishing abrasive is replaced at a frequency of 90 pcs / h, the rounding processing time is 25 min, the target angle value is not less than 40°, and the first target surface finish is... .

[0060] Polishing abrasive refers to flexible grinding tools used for surface polishing. Specifically, they can be made from a composite laminate of blended fibers and abrasive, with the fiber gaps accommodating abrasive debris and maintaining a uniform distribution of grinding force. Replacement frequency refers to the number of times the polishing abrasive is replaced per unit time, which can be achieved by setting an automatic replacement device to prevent excessive wear and subsequent degradation of surface finish. Target angle value refers to the angle range at the junction of the fillet and the orifice wall, which can be achieved by adjusting the radius of curvature of the grinding trajectory to meet the optimization requirements of the fillet structure for fluid resistance.

[0061] In the rounding stage, a polishing abrasive made of blended material is mounted on the rotating shaft of the rounding mechanism. Stable grinding capability is maintained by periodically changing the abrasive. After the rotating valve head is fixed in the polishing station, the polishing abrasive reciprocates along a predetermined trajectory along the orifice wall. During grinding, the elastic deformation of the blended fibers ensures uniform contact of the abrasive with the orifice wall surface, gradually removing burrs and forming rounded corners. During this process, grinding parameters are dynamically adjusted according to the target angle value and surface finish requirements. For example, by controlling the contact pressure between the abrasive and the orifice wall and the rotation speed, the angle and surface quality of the rounded corner structure are ensured to meet preset standards. Thus, through automated rounding technology, combined with the material properties and parametric control of the blended abrasive, efficient batch processing of micro-orifice wall structures is achieved, avoiding quality fluctuations introduced by manual operation and further eliminating small-sized adhering substances and burrs formed during processing. The effect of rounding the valve orifice wall is shown in the image. Figure 4 As shown.

[0062] In some embodiments, before rounding the orifice wall of the valve orifice, the process further includes: using a cleaning mechanism to perform high-pressure pulse cleaning on the inner wall and orifice wall of the valve orifice, so that the inner wall and orifice wall of the valve orifice are free of burrs and adhesions. The cleaning fluid flow rate of the high-pressure pulse cleaning is 300 ml / min, the cleaning frequency of the high-pressure pulse cleaning is alternating between 0.25 Hz and 0.5 Hz, and the cleaning pressure of the high-pressure pulse cleaning is 1.2 MPa.

[0063] High-pressure pulse cleaning refers to cleaning the pore walls through periodic, alternating high-pressure fluid impacts. This can be achieved using a cleaning pump with a pulse control module. The alternating pulse frequency enhances penetration into minute gaps. The alternating cleaning frequency refers to the dynamic variation of the high-pressure pulse intervals, which can be achieved by setting the pulse sequence using a programmable logic controller. The alternating frequency can adapt to the peeling requirements of adhesives of different sizes.

[0064] Before rounding the corners, the rotary valve head is transported to the cleaning station. The cleaning mechanism uses high-pressure pulses to directionally spray cleaning fluid onto the inner wall and orifice wall of the valve orifice. The alternating pulse frequency creates periodic impact forces in the fluid, and combined with specific flow rate and pressure, it can peel off tiny metal debris and machining residues adhering to the orifice wall. During the cleaning process, the dynamically changing pulse pattern can cover the adhesive in different locations, while avoiding cleaning blind spots caused by a single frequency. Thus, by combining high-pressure pulses with dynamic frequency, automated and efficient cleaning is achieved without relying on manual intervention under a microscope, while also avoiding valve core scratches caused by burr residue. The cleaning effect on the inner wall and orifice wall of the valve orifice is as follows: Figure 5 As shown.

[0065] In some embodiments, before rounding the orifice wall of the valve hole, the process further includes: polishing the working surface using a polishing mechanism to achieve a target flatness and a second target surface finish. The polishing axial speed is 200 rad / min, the polishing time is 15 min, diamond polishing slurry is used, and the second target surface finish is... The target flatness is 0.005mm.

[0066] Polishing axial speed refers to the rate at which the polishing tool moves along the axial direction. This can be achieved using a servo motor in conjunction with a ball screw. This speed control directly affects the uniformity of polishing. Target flatness refers to the maximum allowable surface undulation deviation of the working surface. This can be measured using a laser interferometer and fed back to the polishing mechanism to achieve closed-loop control, ensuring the flatness of the processed surface.

[0067] After the valve bore grinding is completed, the rotating valve head is transferred to the polishing station. The polishing mechanism drives a polishing tool containing diamond abrasive slurry to move axially along the working surface at a set speed while maintaining constant pressure contact. During polishing, the diamond particles in the slurry cut the microscopic protrusions on the working surface. After 15 minutes, the surface roughness is reduced to the second target finish, and the flatness error is controlled within 0.005mm. This results in a uniform and smooth surface, eliminating microscopic scratches and adhesion residue remaining from the grinding stage. By adding a polishing step, surface defects are thoroughly eliminated before rounding the corners, preventing burrs from protruding from the bore wall due to uneven substrate.

[0068] In some embodiments, the valve hole processing method further includes: using a detection mechanism to perform angle value detection and surface finish detection on the orifice wall of the valve hole after rounding, comparing the angle detection value with a preset angle value range and comparing the surface finish detection value with a preset surface finish range to obtain the corresponding angle value detection result and surface finish detection result.

[0069] Angle value detection refers to the quantitative analysis of the geometric angles of the rounded corner structure of the orifice wall using optical measuring instruments. This can be achieved using a laser profilometer or a digital image processing system, by acquiring orifice wall profile data and calculating the angle deviation value. Surface finish detection refers to the quantitative evaluation of the microscopic morphology of the orifice wall surface, specifically using a contact surface roughness meter or a white light interferometer. This involves measuring the height distribution of surface undulations and calculating roughness parameters. Preset angle value ranges and preset surface finish ranges refer to the qualified judgment ranges pre-set according to valve core assembly requirements, which can be determined through experimental data statistics or process verification.

[0070] After the chamfering process is completed, the inspection mechanism uses a non-contact measuring device to perform a three-dimensional topography scan on the hole wall of the valve hole, generating inspection data including angles and surface topography. The angle inspection module automatically compares the measured angle value with the preset angle value range. If it is within the range, it is determined to be qualified. The surface finish inspection module synchronously analyzes the surface roughness parameters. When the measured value is not higher than the preset surface finish threshold, it is determined to meet the standard. The inspection results are transmitted to the control system in real time through the data interface, realizing the closed-loop feedback of the processing quality. In a specific embodiment, the angle value of the hole wall of the valve hole after chamfering is detected. Specifically, the inspection mechanism focuses on the reference position of the hole wall of the valve hole through the image inspection module, automatically records the Z coordinate information of the reference position, and then the tester adjusts the focus of the image inspection module to the calibration position and automatically records the Z coordinate information of the calibration position. Based on the Z coordinate information of both the reference position and the calibration position, the angle inspection value of the hole wall of the valve hole is fitted, and the fitted angle inspection value is compared with the upper and lower limit values of the preset angle value range to determine whether the angle inspection value meets the inspection requirements. Thus, through the automated inspection system, the synchronous quantitative evaluation of angles and surface finishes is achieved, eliminating the risk of missed inspections caused by manual intervention, and at the same time, the inspection speed can adapt to the batch production rhythm.

[0071] In the above embodiment, the diameter of the valve hole is not greater than 0.5 mm, the cross-sectional shape of the valve hole is oval, and the included angle between the valve hole and the working surface is 50° to 70°.

[0072] Please refer to Figure 6 , the embodiment of the present application further provides a valve hole processing device that can implement the above valve hole processing method. The valve hole processing device includes:

[0073] A punching mechanism 601 for prefabricating a blind hole on the rotating valve head; the blind hole is formed by starting from the non-working surface of the rotating valve head and opening towards the working surface;

[0074] A grinding mechanism 602 for grinding the working surface of the rotating valve head to process the blind hole into a valve hole that communicates with the non-working surface and the working surface of the rotating valve head;

[0075] A chamfering mechanism 603 for chamfering and polishing the hole wall of the valve hole to process the shape of the hole wall into a rounded corner structure with a target radian value and a target surface finish.

[0076] In some embodiments, the valve hole processing device further includes a cleaning mechanism for performing high-pressure pulse cleaning on the inner wall and the hole wall of the valve hole before chamfering the hole wall of the valve hole, so that there is no burr turning outwards and adhesive on the inner wall and the hole wall of the valve hole; the cleaning liquid flow rate of the high-pressure pulse cleaning is 300 ml / min, the cleaning frequency of the high-pressure pulse cleaning is alternately cycled between 0.25 Hz and 0.5 Hz, and the cleaning pressure of the high-pressure pulse cleaning is 1.2 MPa.

[0077] In some embodiments, the valve hole processing equipment further includes a polishing mechanism for polishing the working surface before rounding the orifice wall of the valve hole, so that the working surface achieves a target flatness and a second target surface finish; the polishing axial speed is 200 rad / min, the polishing time is 15 min, diamond polishing slurry is used for polishing, and the second target surface finish is... The target flatness is 0.005mm.

[0078] In some embodiments, the valve hole processing equipment further includes a detection mechanism for detecting the angle value and surface finish of the valve hole wall after rounding, comparing the angle detection value with a preset angle value range and comparing the surface finish detection value with a preset surface finish range to obtain the corresponding angle detection result and surface finish detection result.

[0079] The specific implementation method of the valve hole processing equipment is basically the same as the specific implementation method of the valve hole processing described above, and will not be repeated here.

[0080] This application also provides a high-pressure rotary valve. The high-pressure rotary valve includes a rotary valve head, the valve orifice of which is machined using the valve orifice machining method described above. See also... Figures 7 to 14 Compared with valve holes processed by existing valve hole processing methods, valve holes processed by the valve hole processing method of this embodiment have no obvious burrs, sharp edges, adhesives and impurities, and after a period of use, the valve holes have no obvious chipping and the valve core has no obvious scratches.

[0081] In summary, the valve hole processing method and equipment provided in this application decompose the process of processing the valve hole through into two stages: pre-drilling blind holes from the non-working surface towards the working surface using a drilling mechanism, and grinding the working surface using a grinding mechanism to drill through the blind holes into valve holes. This avoids the sudden stress change at the moment of penetration and creates favorable conditions for subsequent rounding. It can largely eliminate the initial generation of large-sized adhesives and burrs on the valve hole orifice wall. By processing the shape of the valve hole orifice wall into a rounded structure with a target angle value and achieving a first target surface finish through the rounding mechanism, small-sized adhesives and burrs formed during processing can be further eliminated. This efficiently removes undesirable features generated on the valve hole orifice wall during processing in batches. High-pressure rotary valves with valve holes processed using this method have no visible burrs, vertical edges, adhesives, impurities, or other undesirable features.

[0082] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0083] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A method for machining valve holes, characterized in that, include: A drilling mechanism is used to pre-drill blind holes on the rotary valve head; the blind holes are obtained by opening from the non-working surface of the rotary valve head toward the working surface. A grinding mechanism is used to grind the working surface of the rotary valve head to process the blind hole into a valve hole that connects the non-working surface and the working surface of the rotary valve head; A rounding mechanism is used to round the orifice wall of the valve hole, so as to process the shape of the orifice wall into a rounded structure with a target angle value and a first target surface finish. The pre-drilled blind hole on the rotary valve head includes: The rotary valve head is fixed at the drilling station, driving the tool of the drilling mechanism to drill from the non-working surface toward the working surface. During the drilling process, the tool is periodically fed and chips are removed until the distance between the blind hole and the working surface reaches the target blind hole distance. The tool feed rate of the drilling mechanism is 100 mm / min, and the target blind hole distance is 0.11 mm to 0.15 mm. The grinding process on the working surface of the rotary valve head includes: The rotary valve head is conveyed to the grinding station, driving the grinding mechanism to perform periodic gradient feed grinding and cooling on the working surface. During the grinding process, cleaning fluid is introduced into the working surface to clean the generated adhesive. The grinding feed amount of the single gradient feed grinding is 0.005mm, 0.003mm and 0.003mm respectively.

2. The valve hole processing method according to claim 1, characterized in that, The process of rounding the corners of the valve orifice includes: The rotary valve head is conveyed to the polishing station, driving the rounding mechanism to use a polishing abrasive to round the orifice wall of the valve hole; the polishing abrasive is made of a blended material, the polishing abrasive is replaced at a frequency of 90 pcs / h, the rounding processing time is 25 min, the target angle value is not less than 40°, and the first target surface finish is... .

3. The valve hole processing method according to claim 1, characterized in that, Before performing the filleting process on the orifice wall of the valve hole, the method further includes: A cleaning mechanism is used to perform high-pressure pulse cleaning on the inner wall and orifice wall of the valve orifice, so that the inner wall and orifice wall of the valve orifice are free of burrs and adhesions; the cleaning fluid flow rate of the high-pressure pulse cleaning is 300 ml / min, the cleaning frequency of the high-pressure pulse cleaning is 0.25 Hz and 0.5 Hz alternating, and the cleaning pressure of the high-pressure pulse cleaning is 1.2 MPa.

4. The valve hole processing method according to claim 1, characterized in that, Before performing the filleting process on the orifice wall of the valve hole, the method further includes: A polishing mechanism is used to polish the working surface to achieve a target flatness and a second target surface finish. The polishing axial speed is 200 rad / min, the polishing time is 15 minutes, and a diamond polishing slurry is used. The second target surface finish... The flatness of the target is 0.005 mm.

5. The valve hole machining method according to claim 1, characterized in that, Also includes: An inspection mechanism is used to inspect the angle and surface finish of the valve hole after rounding. The angle inspection value is compared with a preset angle range, and the surface finish inspection value is compared with a preset surface finish range to obtain the corresponding angle inspection results and surface finish inspection results.

6. The valve hole machining method according to any one of claims 1 to 5, characterized in that, The diameter of the valve hole is no greater than 0.5 mm, the cross-sectional shape of the valve hole is elliptical, and the included angle between the valve hole and the working surface is 50° to 70°.

7. A high-pressure rotary valve, characterized in that, It includes a rotary valve head, wherein the valve hole of the rotary valve head is processed by the valve hole processing method according to any one of claims 1 to 6.

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