Closing process

Abstract

The application relates to a closing process. The closing process is used for closing the end of a workpiece, the workpiece comprising a first part and a second part, the end of the first part being provided with a mounting groove, and the second part being arranged in the mounting groove; the closing process comprises the following steps: eliminating assembly gaps between the outer wall of the second part and the inner wall of the mounting groove; rolling and closing a preset region of the outer wall of the first part at a constant feeding amount and a constant pressure; maintaining the pressure of the preset region after the rolling and closing at a constant feeding amount and a constant pressure; and cutting the end face of the workpiece. The closing process avoids local stress concentration of the workpiece, wrinkles and cracks are not easily generated in the inner wall of the preset region of the first part, and the safety hidden danger of the workpiece in the working process is eliminated.

Description

Technical Field

[0001] This application relates to the field of precision machinery manufacturing technology, and in particular to the finishing process. Background Technology

[0002] The armature assembly of a solenoid valve is the core moving part of the solenoid valve. It converts electromagnetic energy into mechanical energy through interaction with an electromagnet. The armature assembly moves up and down under the action of electromagnetic force to control the opening and closing of the valve core or diaphragm, thereby regulating the flow of fluid.

[0003] In aerospace and other technological fields, the consistency requirements for miniature solenoid valves are extremely high, necessitating precision machining of the armature assembly ends. In related technologies, the end-capping of the armature assembly is often achieved by operator-controlled lathe rolling, which easily leads to uneven rolling pressure and speed. This results in wrinkles and cracks on the inner wall of the metal groove of the armature assembly, creating serious safety hazards. Furthermore, the dimensional consistency of the armature assembly is poor, resulting in a low product qualification rate and failing to meet production needs. Summary of the Invention

[0004] Therefore, it is necessary to provide a finishing process to address the problems of wrinkles and cracks easily appearing on the inner wall of the metal groove, poor dimensional consistency, and low product qualification rate when finishing the end of the armature assembly.

[0005] A finishing process for finishing the ends of a workpiece, the workpiece including a first component and a second component, the end of the first component having a mounting groove, and the second component disposed within the mounting groove; the finishing process includes:

[0006] Eliminate the assembly gap between the outer wall of the second component and the inner wall of the mounting groove;

[0007] The predetermined area of ​​the outer wall of the first component is rolled and closed with a constant feed rate and constant pressure;

[0008] The preset area after rolling and closing is maintained under constant pressure with constant feed rate and constant pressure;

[0009] The end face of the workpiece is cut.

[0010] In one embodiment, prior to the step of eliminating the assembly gap between the outer wall of the second component and the inner wall of the mounting groove, the second component is positioned within the mounting groove at its axial upper limit.

[0011] In one embodiment, in the step of rolling and closing a preset area of ​​the outer wall of the first component with a constant feed rate and constant pressure, the feed stroke is 75%-85% of the preset total feed stroke.

[0012] In one embodiment, in the step of rolling and closing a preset area of ​​the outer wall of the first component with a constant feed rate and constant pressure, the feed direction is the radial direction of the workpiece.

[0013] In one embodiment, in the step of maintaining pressure on the preset area after rolling and closing with a constant feed rate, the pressure holding time is 25s-40s.

[0014] In one embodiment, the step of cutting the end face of the workpiece includes: cutting the end face of the second component to eliminate indentations on the end face of the second component and to meet the requirements for end face perpendicularity and roughness.

[0015] In one embodiment, in the step of cutting the end face of the workpiece, alcohol is used as the cutting fluid when cutting the end face of the second component.

[0016] In one embodiment, after the step of cutting the end face of the workpiece, online detection is further included to detect the outer diameter d of the end face of the second component and the axial height h of the outer wall of the first component excluding the preset area.

[0017] In one embodiment, after the online inspection, the process further includes random sampling and cutting to check the rolling angle of the workpiece after processing.

[0018] In one embodiment, the sampling and cross-sectioning process also includes data traceability.

[0019] The aforementioned finishing process involves rolling a predetermined area on the outer wall of the first component with a constant feed rate and constant pressure. During the finishing process, the predetermined area on the outer wall of the first component is subjected to uniform stress, avoiding localized stress concentration in the workpiece. This makes the inner wall of the predetermined area of ​​the first component less prone to wrinkles and cracks, eliminating potential safety hazards during operation. Furthermore, after rolling finishing, the predetermined area is held under constant feed rate and constant pressure, effectively eliminating any springback deformation that may occur on the outer wall of the first component after rolling finishing. This ensures the structural stability of the workpiece after rolling finishing, guaranteeing dimensional consistency. It also eliminates the need for secondary clamping, simplifying the process flow and resulting in a high product qualification rate that meets production requirements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the relative positions of the workpiece and the cutting tool in this application.

[0021] Figure 2 This is a schematic diagram showing the dimensions of the workpiece after the opening is closed in this application.

[0022] Figure 3This is a flowchart of the finishing process in this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Workpiece; 101. First component; 1011. Preset area; 102. Second component; 2. Roller cutting tool; 3. Chuck. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0031] Currently, when rolling the armature assembly of a solenoid valve, operators often rely on their personal experience to control the feed rate and pressure on a conventional lathe. Due to human error, the rolling pressure and speed applied by the cutting tool to the metal skeleton in the armature assembly are uneven during operation. This leads to wrinkles and cracks easily forming on the inner wall of the metal skeleton mounting groove, which are not easily detected from the outside of the armature assembly, posing a serious safety hazard during operation. Furthermore, because the rolling pressure and speed applied by the cutting tool to the metal skeleton in the armature assembly are uneven during operation, the end face of the armature assembly after rolling can easily become an elliptical structure. The end faces of the non-metallic structural parts in the metal skeleton mounting groove will also become elliptical. In subsequent operations, the solenoid valve seat is prone to misalignment with the non-metallic structural parts of the armature assembly, leading to sealing failure. Furthermore, the current rolling finishing process suffers from uneven rolling pressure and speed applied by the cutting tool to the metal skeleton in the armature assembly. After the armature assembly is rolled, it needs to be remounted and aged for 24 hours at a temperature of 60°C to 70°C. This results in a cumbersome process and makes it difficult to ensure the dimensional consistency of each armature assembly (e.g., large deviations in rolling angle and outer diameter). Consequently, the product qualification rate is low (only 65-75%), the rework rate for sectioning and inspection is high, and the production efficiency is low (single-piece cycle time > 2 minutes), making it difficult to meet the quality traceability requirements of aerospace for small batches and multiple varieties.

[0032] Based on this, this application proposes a finishing process that makes armature components less prone to wrinkles and cracks, has good dimensional consistency, and a high product rationality rate.

[0033] See Figures 1-3 The closing process provided in one embodiment of this application is used to close the end of a workpiece 1. The workpiece 1 includes a first component 101 and a second component 102. The end of the first component 101 has a mounting groove, and the second component 102 is disposed in the mounting groove.

[0034] The finishing process includes:

[0035] Eliminate the assembly gap between the outer wall of the second component 102 and the inner wall of the mounting groove;

[0036] The predetermined area 1011 of the outer wall of the first component 101 is rolled and closed with constant feed rate and constant pressure;

[0037] The preset area 1011 after rolling and closing is kept under constant pressure with constant feed rate and constant pressure;

[0038] The end face of workpiece 1 is cut.

[0039] This finishing process involves rolling a predetermined area 1011 on the outer wall of the first component 101 with a constant feed rate and constant pressure. During the finishing process, the predetermined area 1011 on the outer wall of the first component 101 experiences uniform stress, avoiding localized stress concentration in the workpiece 1. This makes the inner wall of the predetermined area 1011 less prone to wrinkles and cracks, eliminating safety hazards during operation. Furthermore, after rolling finishing, the predetermined area 1011 is maintained under constant feed rate and constant pressure, effectively eliminating any springback deformation that may occur on the outer wall of the first component 101 after rolling finishing. This ensures structural stability of the workpiece 1 after rolling finishing, guaranteeing dimensional consistency. It also eliminates the need for secondary clamping, simplifying the process and resulting in a high product qualification rate that meets production requirements. Moreover, the workpiece 1 (such as an armature assembly) processed by this finishing process has a regular circular cross-sectional shape at its end face. This type of workpiece 1 can accurately and reliably fit with the valve seat, ensuring a sealing effect.

[0040] The closing process of this application is used to close the end of workpiece 1. In one embodiment, workpiece 1 has an assembly end and a closing end. The outer diameter of the assembly end is D. The closing process of this application is used to close the closing end of workpiece 1.

[0041] See Figure 1 and Figure 2As shown, workpiece 1 includes a first component 101 and a second component 102. At the constricted end of workpiece 1, the end of the first component 101 has a mounting groove, and the second component 102 is disposed within the mounting groove. In one embodiment, workpiece 1 is a solenoid valve armature assembly. Specifically, before assembly, the first component 101 and the second component 102 are respectively machined and formed. The end of the first component 101 has a mounting groove with an opening. The second component 102 is adapted to be inserted into the mounting groove through the opening. After the second component 102 is inserted into the mounting groove, the first component 101 and the second component 102 are coaxially arranged.

[0042] In one embodiment, the first component 101 is made of a metallic material, such as a metal skeleton made of a magnetic alloy, and the second component 102 is made of a non-metallic material, such as a non-metallic structural component, such as a fluoroplastic block. The fluoroplastic block in the solenoid valve armature assembly is used to abut against other structures of the solenoid valve (such as valve seat) to achieve a seal.

[0043] The outer wall of the mounting groove of the first component 101 has a preset area 1011 (i.e., a closing area). After the second component 102 is installed into the mounting groove, the preset area 1011 needs to be closed to ensure that the first component 101 covers the second component 102, thereby ensuring the stable installation of the second component 102 and guaranteeing the sealing performance of the solenoid valve under subsequent high temperature and high pressure conditions. The closing process of this application is used to close the end of the workpiece 1, and the closing process is applied to the preset area 1011 on the outer wall of the mounting groove of the first component 101.

[0044] See Figure 3 As shown, the finishing process of this application includes:

[0045] S01. Eliminate the assembly gap between the outer wall of the second component 102 and the inner wall of the mounting groove;

[0046] S02. Roll the predetermined area 1011 of the outer wall of the first component 101 with constant feed rate and constant pressure to close the seam.

[0047] S03. Maintain pressure on the preset area 1011 after rolling and closing with constant feed rate and constant pressure.

[0048] S04. Perform cutting treatment on the end face of workpiece 1.

[0049] After the workpiece 1 is rolled and closed by the closing process of this application, wrinkles and cracks are less likely to appear on the inner wall of the preset area 1011 of the first component 101, which can eliminate the safety hazards of the workpiece 1 during the working process. Moreover, it can effectively eliminate the springback deformation that may occur on the outer wall of the first component 101 after rolling and closing, so that the structure of the workpiece 1 after rolling and closing is stable, and the dimensional consistency of the workpiece 1 after rolling and closing is ensured. No secondary clamping processing is required, which simplifies the process flow and improves the product qualification rate of the workpiece 1.

[0050] In one embodiment, the finishing process of this application utilizes a precision CNC lathe (CNC, Computer Numerical Control, or Computer Numerical Control System) to optimize process steps, process parameters, and tool paths, thereby ensuring the dimensional consistency of workpiece 1 after rolling finishing, simplifying the process flow, and improving the product qualification rate of workpiece 1.

[0051] The precision CNC lathe has the following parameters: spindle radial runout ≤ 0.002 mm, repeatability ≤ 0.003 mm, and the rolling cutter 2 is made of high-carbon chromium bearing steel. The lathe's fixture is a chuck 3, specifically a pneumatic three-jaw chuck with adjustable clamping force to prevent deformation of the workpiece 1's outer wall. The lathe's measuring instrument is an online contact probe used for inspecting the first workpiece 1 and for random sampling. The inspection items include the outer diameter d of the end face of the second component 102 of workpiece 1 and the axial height h of the outer wall of the first component 101 excluding the preset area 1011.

[0052] In one embodiment of this application, prior to the step of eliminating the assembly gap between the outer wall of the second component 102 and the inner wall of the mounting groove, the second component 102 is positioned within the mounting groove at its axial upper limit.

[0053] Before step S01, which eliminates the assembly gap between the outer wall of the second component 102 and the inner wall of the mounting groove, in order to prevent the second component 102 from coming out of the mounting groove during the rolling and closing process, it is necessary to limit the second component 102 in the axial direction so that the second component 102 is firmly set in the mounting groove during the rolling and closing process, thus ensuring the smooth progress of the closing process.

[0054] In one embodiment, a top block is provided on the tailstock of a precision CNC lathe. By moving the tailstock, the top block abuts against the end face of the second component 102 that is exposed in the mounting groove opening, preventing the second component 102 from shifting during the rolling and closing process.

[0055] It should be noted that the abutting force applied by the top block to the second component 102 is relatively light and will not damage the end face of the second component 102 exposed in the mounting groove opening.

[0056] In one embodiment of this application, in the step of rolling and closing a preset area 1011 on the outer wall of the first component 101 with a constant feed rate and constant pressure, the feed stroke is 75%-85% of the preset total feed stroke.

[0057] Before the workpiece 1 is finished, the movement path of the rolling tool 2 of the precision CNC lathe is planned in advance, and the preset total feed stroke of the rolling tool 2 is set. Step S02, rolling the preset area 1011 of the outer wall of the first component 101 with constant feed and constant pressure, is one of the main steps of the finishing process of this application. The rolling tool 2 applies a constant feed and constant pressure to the preset area 1011 of the first component 101. During this process, the feed stroke (cumulative feed) of the rolling tool 2 reaches 75%-85% of the preset total feed stroke so that the preset area 1011 of the first component 101 is basically formed, but the required size and shape requirements have not yet been reached.

[0058] For example, in this step, the feed stroke of the rolling tool 2 can be 75%, 78%, 80%, 83%, 85% of the preset total feed stroke, etc.

[0059] In one embodiment of this application, in the step of rolling and closing a preset area 1011 on the outer wall of the first component 101 with a constant feed rate and constant pressure, the feed direction is the radial direction of the workpiece 1.

[0060] Before finishing the workpiece 1, the axial distance between the rolling cutter 2 and the workpiece 1 is adjusted in advance. For example, the axial distance between the end of the rolling cutter 2 and the end face of the workpiece 1 is 0.05mm.

[0061] In step S02, which involves rolling and closing the preset area 1011 of the outer wall of the first component 101 with a constant feed rate and constant pressure, the feed direction of the rolling cutter 2 is the radial direction of the workpiece 1, so as to achieve rolling and closing of the preset area 1011.

[0062] In one embodiment of this application, in the step of maintaining pressure on the preset area 1011 after rolling and closing with a constant feed rate, the pressure holding time is 25s-40s.

[0063] Step S03, holding the preset area 1011 after rolling and closing with constant feed and constant pressure, is another major step in the closing process of this application. It is mainly used to finish the preset area 1011 of the first component 101 and eliminate the springback of the preset area 1011.

[0064] During this process, the pressure holding time of the rolling cutter 2 on the preset area 1011 is 25s-40s to eliminate the springback deformation of the preset area 1011 and make the preset area 1011 form a rolling angle that meets the production requirements.

[0065] For example, the holding time of the rolling cutter 2 for the preset area 1011 can be 25s, 30s, 36s, 40s, etc.

[0066] In one embodiment of this application, the step of cutting the end face of workpiece 1 includes: cutting the end face of the second component 102, eliminating the indentation on the end face of the second component 102, and meeting the requirements for end face perpendicularity and roughness.

[0067] After workpiece 1 is processed by steps S02 and S03, the end face of the second component 102 will protrude from the end face of the first component 101 due to the pressure of the side wall of the mounting groove of the first component 101. In order to facilitate subsequent cutting, the end face of the second component 102 is reserved with a 0.5mm allowance in axial height, so that the end face of the second component 102 after cutting protrudes from the end face of the first component 101, in order to ensure the subsequent sealing effect.

[0068] Of course, in this step, the end face of the first component 101 also needs to be cut to make the end face of the first component 101 flat and meet the dimensional requirements such as perpendicularity.

[0069] Step S04: Perform cutting treatment on the end face of workpiece 1, including:

[0070] Step S041: Cut the end face of the first component 101.

[0071] When cutting the end face of the first component 101, the cutting speed and feed rate of the cutting tool should be reasonably controlled, and cutting fluid should be applied sufficiently for cooling to ensure that the temperature of each component is always below 100℃, so as to ensure the connection quality between the first component 101 and the second component 102.

[0072] Step S042: Rough machining of the end face of the second component 102.

[0073] The end face of the second component 102 is cut with a cutting tool to eliminate the indentation on the end face of the second component 102, and at the same time eliminate the scratches, dents and other defects generated on the end face of the second component 102 during the turnover and transportation of the workpiece 1.

[0074] Step S043: Finish machine the end face of the second component 102.

[0075] The cutting edge of the cutting tool is kept sharp, and the end face of the second component 102 exposed by the mounting slot opening is precision machined to meet the requirements of axial perpendicularity and surface roughness.

[0076] In one embodiment of this application, in the step of cutting the end face of workpiece 1, alcohol is used as the cutting fluid when cutting the end face of the second component 102.

[0077] In one embodiment, in step S04, the end face of workpiece 1 is cut, alcohol is used as the cutting fluid when cutting the end face of the second component 102. This cutting fluid can achieve efficient cooling, is environmentally friendly and leaves no residue, and does not require cutting fluid removal processing, further simplifying the process flow.

[0078] In one embodiment of this application, after the step of cutting the end face of the workpiece 1, online detection is further included to detect the outer diameter d of the end face of the second component 102 and the axial height h of the outer wall of the first component 101 excluding the preset area 1011.

[0079] To ensure the quality of the finishing of workpiece 1, after step S04, which involves cutting the end face of workpiece 1, an online inspection step is also included. The finished workpiece 1 is inspected online, and if the dimensions of workpiece 1 meet the requirements, mass production continues.

[0080] In one embodiment, the dimensions of workpiece 1 are measured using an online contact probe on a precision CNC lathe. The measured dimensions include the outer diameter d of the end face of the second component 102 and the axial height h of the outer wall of the first component 101 excluding the preset area 1011. (See reference...) Figure 2 As shown. If both the outer diameter d and the axial height h meet the production requirements, then mass production continues.

[0081] In one embodiment of this application, after online inspection, the process further includes random sampling and cutting to inspect the rolling angle of the processed workpiece 1.

[0082] To further ensure the quality of the finishing of workpiece 1, after the online inspection step, a sampling inspection step is also included to check whether the rolling angle A of the finished workpiece 1 meets the generation requirements. The generation requirements are: rolling angle A ≥ 25°, and optionally, the rolling angle A is stable within the range of 26° to 27°.

[0083] In one embodiment, one out of every 20 workpieces is randomly selected for inspection. The rolling angle A is detected using an image sensor, and the detection data is automatically uploaded to the MES system (Manufacturing Execution System).

[0084] In one embodiment of this application, after the sampling inspection is performed, data traceability is also included.

[0085] Following the sampling and cutting step, there is also a data traceability step. The CNC system records the spindle load curve, tool compensation value, workpiece number, etc., to achieve full traceability, thereby accurately locating quality problems and improving both quality and efficiency.

[0086] The processing of the second component 102 and the assembly process of the first component 101 and the second component 102 are as follows:

[0087] Select suitable fluoroplastic rods and machine them into fluoroplastic blocks (second component 102) on a precision lathe according to the dimensional requirements of the design drawings, ensuring that the dimensional accuracy of the plastic blocks meets the assembly requirements. Then, slowly press the machined fluoroplastic blocks (second component 102) into the mounting groove of the metal frame (first component 101), ensuring that the plastic blocks fit tightly against the mounting groove of the metal frame.

[0088] The following is in conjunction with the appendix Figures 1-3 The specific steps of the finishing process in this application are described in detail.

[0089] Step 1, Pre-installation

[0090] Workpiece 1 is loaded into the chuck 3 (specifically a three-jaw chuck) of the precision CNC lathe. The chuck 3 clamps and holds the outer wall of workpiece 1, achieving radial positioning of workpiece 1. Furthermore, the end face of workpiece 1 is brought into close contact with the end face (or positioning step) of the chuck 3, achieving axial positioning of workpiece 1. This completes the precise clamping of workpiece 1. The clamping force of the chuck 3 on workpiece 1 is 0.25 MPa.

[0091] Step 2, setting the knife

[0092] The calibrated rolling tool 2 is mounted on the tool post of a precision CNC lathe and fixed by a tool locking device. The radial and axial runout of the rolling tool 2 is then tested to ensure that it is within the allowable range.

[0093] Align the roller burnishing cutter 2 (roller cutter) with the preset area 1011 of the first component 101, and ensure that the axial distance between the end of the roller burnishing cutter 2 and the end face of the workpiece 1 is 0.05 mm. (Refer to...) Figure 1 As shown. Furthermore, by utilizing the coordinate positioning function of a precision CNC lathe, the cutting edge of the rolling tool 2 is accurately aligned with the starting position of the closing edge of the preset area 1011 of the first component 101.

[0094] Step 3, roll to seal the seam

[0095] In this step, the rolling cutter 2 is fed in three stages to achieve a gradual closing of the preset area 1011, avoid local stress concentration in the workpiece 1, make the inner wall of the preset area of ​​the first component less prone to wrinkles and cracks, and at the same time eliminate the springback deformation of the workpiece 1, so that the structure of the workpiece 1 after rolling closing is stable.

[0096] In the rolling and finishing step, the spindle speed of the precision CNC lathe is n = 300 r / min (to reduce the temperature rise of the second component 102), and the feed rate is F = 0.005 mm / r (constant in the CNC system) to achieve constant feed rolling, so that a rolling angle A greater than 25° is formed at the preset area 1011 (finishing point) of the first component 101.

[0097] ① Initial stage: Eliminate the assembly gap between the outer wall of the second component 102 and the inner wall of the mounting groove.

[0098] Since the first component 101 and the second component 102 of workpiece 1 are processed separately before assembly, after the mounting grooves of the first component 101 and the second component 102 are assembled, there is an assembly gap between the outer wall of the second component 102 and the inner wall of the mounting groove. Before rolling and closing, the assembly gap between the outer wall of the second component 102 and the inner wall of the mounting groove should be eliminated to ensure that the second component 102 does not undergo radial displacement during the rolling and closing process.

[0099] Specifically, the tailstock of the precision CNC lathe is moved so that the top block on the tailstock abuts against the end face of the second component 102 exposed in the mounting groove opening, preventing the second component 102 from dislodging from the mounting groove during the rolling process. Then, the rolling cutter 2 is controlled to feed radially by 0.05 mm to eliminate the assembly gap between the outer wall of the second component 102 and the inner wall of the mounting groove. The feed direction of the rolling cutter 2 is as follows: Figure 1 The direction indicated by the middle arrow a.

[0100] ② In the main deformation section, a predetermined area 1011 on the outer wall of the first component 101 is rolled and closed with a constant feed rate and constant pressure.

[0101] The main deformation section is the core stage of the rolling and finishing process. The rolling cutter 2 is controlled to feed radially (moving towards the center of the workpiece 1 along the feed direction). The feed stroke (cumulative feed) of the rolling cutter 2 reaches 75%-85% of the preset total feed stroke, such as 80%. At this time, the preset area 1011 of the first component 101 is basically formed, but it has not yet reached the required size and shape requirements.

[0102] During this process, the rolling condition is monitored in real time to ensure that the preset area 1011 of the first component 101 deforms evenly until the end is firmly closed.

[0103] ③ Finishing section: The preset area 1011 after rolling and closing is pressure-maintained with constant feed rate and constant pressure.

[0104] The rolling cutter 2 is controlled to perform pressure holding feed with a feed amount of 0.02mm to eliminate the springback deformation of the preset area 1011. During this process, the rolling cutter 2 holds the pressure on the preset area 1011 for 25s-40s, for example, 30s.

[0105] Step four: Machining. The end face of workpiece 1 is machined.

[0106] After workpiece 1 has undergone step three processing, the end face of the second component 102 will protrude from the end face of the first component 101 due to the pressure from the side wall of the mounting groove of the first component 101. In order to facilitate subsequent cutting processing, a 0.5mm allowance is reserved in the axial height of the end face of the second component 102, so that the end face of the second component 102 after cutting will protrude from the end face of the first component 101, in order to ensure the subsequent sealing effect.

[0107] ① Cut the end face of the first component 101

[0108] When cutting the end face of the first component 101, the cutting speed and feed rate of the cutting tool should be reasonably controlled, and cutting fluid should be applied sufficiently for cooling to ensure that the temperature of each component is always below 100℃, so as to ensure the connection quality between the first component 101 and the second component 102.

[0109] ② Rough machining of the second component 102 end face

[0110] The end face of the second component 102 is cut with a cutting tool to eliminate the indentation on the end face of the second component 102, and at the same time eliminate the scratches, dents and other defects generated on the end face of the second component 102 during the turnover and transportation of the workpiece 1.

[0111] ③ Finish machining of the end face of the second component 102

[0112] The cutting tool edge is kept sharp, the cutting speed is controlled at 70-100 m / min, and the feed rate is 0.025-0.050 mm / r. The end face of the second component 102 exposed in the mounting slot opening is finish-machined to meet the requirements for axial perpendicularity and surface roughness. Furthermore, alcohol is used as the cutting fluid during the cutting process.

[0113] Step 5, Online Testing

[0114] After completing the above steps, the dimensions of workpiece 1 are measured using an online contact probe on a precision CNC lathe. The measured dimensions include the outer diameter d of the end face of the second component 102 and the axial height h of the outer wall of the first component 101 excluding the preset area 1011. (See reference...) Figure 2 As shown. If both the outer diameter d and the axial height h meet the production requirements, then mass production continues.

[0115] Step 6, random sampling and dissection

[0116] One out of every 20 workpieces is randomly selected for inspection. The rolling angle A is detected using an image sensor, and the inspection data is automatically uploaded to the MES system.

[0117] The workpiece 1, after being rolled and finished, is sectioned along its central axis using a precision machining center to obtain a sectioned sample. The sectioned sample is placed on the worktable of an imaging instrument, and the focus and illumination of the instrument are adjusted to ensure a clear image of the rolling angle A. The rolling angle A is then measured using the instrument's measurement software. If the measurement result shows that the rolling angle A is greater than 25 degrees, the workpiece 1 is deemed qualified.

[0118] Step 7, Data Traceability

[0119] The CNC system records spindle load curves, tool compensation values, workpiece numbers, etc., enabling full traceability throughout the process.

[0120] The sealing process of this application employs a precision CNC lathe (CNC, Computer Numerical Control). By optimizing process steps, process parameters, and tool paths, it achieves consistency between the rolling angle A of each workpiece 1 and the outer diameter d of the end face of the second component 102, while also ensuring the axial height h of the outer wall of the first component 101 excluding the preset area 1011, thereby improving production efficiency and traceability. This sealing process is applicable to manufacturing scenarios such as aerospace and aviation, where extremely high sealing consistency requirements exist for miniature solenoid valves.

[0121] According to DOE (Design of Experiments) verification, when n=300 r / min, F=0.005 mm / r, and the rolling angle A is stable at 26°-27°, the springback of the first component 101 is ≤0.01 mm, and the first component 101 has no tearing or overheating blueing phenomenon.

[0122] The finishing process described in this application ensures the consistency of the rolling angle A of workpiece 1 (rolling angle A is greater than 25° and the error is within 1°), meeting aerospace standards. Furthermore, the cycle time for a single workpiece is reduced to 35 seconds, increasing production efficiency by 3.4 times. The operator only needs to perform one clamping operation and confirm the sampling results, minimizing human interference. Moreover, 100% data closed-loop traceability is achieved through CNC programming and online detection.

[0123] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A finishing process, characterized in that, The process is used to close the end of a workpiece (1), which includes a first component (101) and a second component (102). The workpiece (1) is an armature assembly of a solenoid valve. The first component (101) is a metal frame made of a magnetic alloy, and the second component (102) is a fluoroplastic block. The end of the first component (101) has a mounting groove, and the second component (102) is disposed in the mounting groove. The closing process is used to gradually close a preset area (1011) on the outer wall of the first component (101). The closing process includes: The second component (102) is positioned within the mounting groove at its axial upper limit; Align the rolling cutter (2) with the preset area (1011), the radial direction of the rolling cutter (2) is set at an angle to the radial direction of the workpiece (1), and the feed direction of the rolling cutter (2) is the radial direction of the workpiece (1). The rolling cutter (2) is fed in three stages with a gradual feed: In the initial stage, the rolling cutter (2) is controlled to feed radially to eliminate the assembly gap between the outer wall of the second component (102) and the inner wall of the mounting groove; In the main deformation section, a predetermined area (1011) on the outer wall of the first component (101) is rolled and closed with a constant feed rate and constant pressure. The feed stroke is 75%-85% of the predetermined total feed stroke. In the finishing section, the preset area (1011) after rolling and closing is held under constant pressure with constant feed rate and constant pressure to eliminate the springback deformation of the preset area (1011). The holding time is 25s-40s. The end face of the workpiece (1) is cut.

2. The finishing process according to claim 1, characterized in that, The step of cutting the end face of the workpiece (1) includes: cutting the end face of the second component (102), eliminating the indentation on the end face of the second component (102), and meeting the requirements for end face perpendicularity and roughness.

3. The finishing process according to claim 2, characterized in that, In the step of cutting the end face of the workpiece (1), alcohol is used as the cutting fluid when cutting the end face of the second component (102).

4. The finishing process according to any one of claims 1-3, characterized in that, After the step of cutting the end face of the workpiece (1), the method further includes online detection, which detects the outer diameter d of the end face of the second component (102) and the axial height h of the outer wall of the first component (101) excluding the preset area (1011).

5. The finishing process according to claim 4, characterized in that, After the online inspection, the process also includes random sampling and cutting to check the rolling angle of the workpiece (1) after processing.

6. The finishing process according to claim 5, characterized in that, The sampling inspection process also includes data traceability.

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