Swing grinding and polishing device and micro sealing spherical surface polishing method

Abstract

The invention provides a swing grinding and polishing device and a micro sealing spherical surface polishing method. The swing grinding and polishing device comprises a clamping connecting part, a swing centering part, a positioning core rod, an adjusting part and an electric grinder mounting part, the clamping connecting part is used for being connected to a lathe saddle, and the swing centering part is mounted above the clamping connecting part; the swing centering part is used for achieving swing rotation, the positioning core rod and the adjusting part are installed above the swing centering part, the electric grinder installation part is installed above the adjusting part, and the positioning core rod is a conversion reference for adjusting the relative position between a grinding head and a machined spherical surface. According to the swing grinding and polishing device and the micro sealing spherical surface polishing method, when a part is clamped on a lathe to rotate, a high-speed electric grinder is used for clamping a special grinding head, the part leans against a polished arc surface with set pressure to rotate at a high speed for grinding, and reciprocating friction swing is carried out according to the radian of the polished surface; therefore, the size, the shape precision and the surface roughness of the whole spherical surface meet the requirements.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing, and in particular relates to a swing grinding and polishing device and a micro-sealed spherical surface polishing method. Background Art

[0002] In solenoid valve products, the relevant positions rely on the small-diameter end face annular spherical structure to play a sealing role. The final high-precision surface forming of these sealing spheres relies on manual polishing by the operator to ensure the Ra0.2 surface roughness requirement. During the polishing process of the sealing sphere, due to the small size of the processed surface, the operator's fingers cannot directly press on the processing contact surface between the sandpaper and the part. The pressure can only be applied to polish the surface by the bending force of the folded sandpaper. Therefore, the quality of the processed surface is difficult to control and the processing efficiency is low. At present, it takes 6 to 8 hours to manually polish the polished surfaces of all parts. In addition, manual polishing has high operating technology requirements for the processor and high operating intensity. The processing quality and efficiency are greatly affected by human factors. With the gradual increase in product production batches, it is necessary to improve and upgrade the polishing process to effectively improve the polishing efficiency and quality requirements of parts. Summary of the invention

[0003] In view of this, the present invention aims to provide an oscillating grinding and polishing device to solve the problem of polishing the high-precision surface of solenoid valve parts.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows: A swing grinding and polishing device comprises a clamping connection part, a swing centering part, a positioning core rod, an adjusting part, and an electric grinder mounting part. The clamping connection part is used to be connected to a lathe tool rest, and the swing centering part is installed on the top; the swing centering part is used to realize swing rotation, the positioning core rod and the adjusting part are respectively installed on the top of the swing centering part, and the electric grinder mounting part is installed on the top of the adjusting part. The positioning core rod is a conversion reference for adjusting the relative position between the grinding head and the processed spherical surface.

[0005] Furthermore, the clamping connection part includes a clamping plate and a supporting plate, the height dimension between the clamping plate and the supporting plate can be adjusted, and a swing centering part is installed at one end of the supporting plate.

[0006] Furthermore, the swing centering part includes a swing seat, a rotating shaft and a bearing. The outer ring of the bearing is interference fit with the support plate, and the inner ring is interference fit with the rotating shaft. The outer part of the rotating shaft is movably sleeved on the swing seat, so that the swing seat can realize swing rotation, and an adjustment part is installed on the swing seat; the upper end of the bearing is fitted with a small gap with the positioning core rod.

[0007] Furthermore, the positioning mandrel includes a positioning sleeve and an upper half shaft and a lower half shaft fixedly connected at its upper and lower ends respectively, the upper half shaft is used to calibrate the position of the grinding head; the lower half shaft is matched with the rotating shaft with a small gap.

[0008] Furthermore, the adjusting part includes a mounting seat, the bottom of the mounting seat is slidably connected to the swing seat, and an adjusting screw is installed on one side with a clearance fit, so that the mounting seat can move along the positioning groove of the swing seat when the adjusting screw rotates; a lateral fixing block is installed on one side of the mounting seat through a screw, and the top of the mounting seat is slidably connected to the electric grinder mounting seat of the electric grinder mounting part, and one side of the electric grinder mounting seat is provided with an open card groove that is clearance fit with the annular groove of the lateral adjusting screw, and the lateral adjusting screw passes through the lateral fixing block, so that the electric grinder mounting seat can move along the groove of the mounting seat when the lateral adjusting screw rotates.

[0009] Furthermore, the electric grinder installation part includes an electric grinder, an electric grinder installation seat and a grinding head. The electric grinder is installed above the electric grinder installation seat, and the grinding head of the electric grinder is located above the positioning core rod.

[0010] Compared with the prior art, the oscillating polishing device of the present invention has the following advantages: (1) The oscillating grinding and polishing device of the present invention is a device in which a part is clamped on a lathe and rotated. A special grinding head is clamped on a high-speed electric grinder and rotated at a high speed against the arc surface to be polished at a set pressure. The part is rubbed and swung back and forth according to the arc of the polished surface, thereby ensuring that the size, shape accuracy and surface roughness of the entire spherical surface meet the requirements.

[0011] (2) The swing polishing device described in the present invention can control the grinding head to polish spherical surfaces of different radius sizes through the swing polishing device adjustment mechanism, and can also perform micro-feeding according to the wear condition of the grinding head.

[0012] (3) The swing grinding and polishing device of the present invention can utilize an electric grinder to clamp a tiny drill or milling cutter, and realize micro-hole processing in various directions such as the axial and radial directions of parts on a lathe, thereby expanding the processing range of lathes and CNC lathes.

[0013] (4) The oscillating grinding and polishing device described in the present invention has a simple structure, convenient process operation and low use cost.

[0014] Another object of the present invention is to provide a method for polishing a tiny sealing sphere surface to solve the problem of polishing the high-precision surface of solenoid valve parts.

[0015] To achieve the above object, the technical solution of the present invention is achieved as follows: A method for polishing a micro-sealed spherical surface, using the oscillating grinding and polishing device described in any one of claims 1 to 6.

[0016] Furthermore, the micro-sealed spherical surface polishing method comprises the following steps: S1. Use the slit sleeve to install the outer circle of the small end of the part. After the soft claws are processed online, the slit sleeve is clamped to complete the part clamping; S2. Use the swing grinding and polishing device to perform grinding and polishing processing; fix the swing grinding and polishing device on the lathe tool holder, install the positioning mandrel at the center hole of the swing seat shaft, install the grinder and the grinding head and turn on the power, and adjust the rotation center of the grinding head to the same height as the rotation center of the part to ensure the axial and radial installation accuracy when repeatedly clamping the parts; S3, the machine tool controls the grinding feed rate and operates the swing grinding and polishing device to swing back and forth for grinding and polishing; S4, move the grinding and polishing device away from the parts, remove the parts, clean them, and inspect them under a microscope. If the requirements are met, polishing is completed; S5, otherwise continue to clamp the parts, move the grinding and polishing device to the corresponding position of step S23, and perform operations according to steps S3 and S4 until the parts meet the requirements; S6. Observe the processed surface under a 10x microscope for scratches, abrasions, spots and other defects. If there are defects, repeat steps S1 to S5. After self-testing, proceed to the next step. S7. Parts protection and inspection.

[0017] Furthermore, the specific method of S2 is as follows: first, the axial and radial position coordinates between the center of the positioning mandrel and the center of the arc surface to be polished of the part are determined based on the end face and the outer cylindrical surface of the part respectively. Then, the tool holder is moved to make the grinding head away from the part, and then the grinding head grinding position is moved to the corresponding position of the positioning mandrel through the device adjustment mechanism, so that the rotation radius of the grinding head grinding position is consistent with the radius of the arc surface to be polished, and then the mounting seat and the electric grinder mounting seat are locked respectively; the positioning mandrel is removed, and the grinding head is moved to the arc surface to be polished of the part according to the position coordinate value between the positioning mandrel and the part.

[0018] The advantages of the micro-sealed spherical surface polishing method and the above-mentioned oscillating grinding and polishing device over the prior art are the same and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 Schematic diagram of the oscillating polishing device according to an embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the oscillating polishing device according to an embodiment of the present invention Figure 2 ; Figure 3 is a schematic diagram of a mounting base according to an embodiment of the present invention; Figure 4 It is a schematic diagram of a positioning mandrel according to an embodiment of the present invention; Figure 5A schematic diagram of a swing centering part according to an embodiment of the present invention; Figure 6 A schematic diagram of a part according to an embodiment of the present invention; Figure 7 A schematic diagram of a slit sleeve according to an embodiment of the present invention; Figure 8 This is a schematic diagram of a slit set clamp according to an embodiment of the present invention; Fig. 9 A schematic diagram of polishing of a grinding head according to an embodiment of the present invention; Fig.10 This is a schematic diagram of the reciprocating polishing of the grinding head according to an embodiment of the present invention.

[0020] Description of reference numerals: 1- splint, 2- column, 3- support plate, 4- electric grinder, 5- swing seat, 6- mounting seat, 7- electric grinder mounting seat, 8- lateral fixing block, 9- lateral adjusting screw, 10- adjusting screw, 11- positioning mandrel, 12- grinding head, 13- locking nut, 14- bearing, 15- bearing retaining ring, 16- rotating shaft, A- parts. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0025] like Figures 1 to 10 As shown, the swing grinding and polishing device includes a clamping connection part, a swing centering part, a positioning core rod, an adjusting part, and an electric grinder mounting part. The clamping connection part is used to be connected to the lathe tool holder, and the swing centering part is installed on the top; the swing centering part is used to realize swing rotation, and the positioning core rod 11 and the adjusting part are respectively installed above the swing centering part, and the electric grinder mounting part is installed above the adjusting part. The positioning core rod 11 is a conversion reference for adjusting the relative position between the grinding head and the processed spherical surface.

[0026] The clamping connection part is used to fix the swing polishing device on the lathe tool holder, and includes a clamping plate 1, a column 2 and a support plate 3. One end of the clamping plate 1 and the support plate 3 each has an opening hole for inserting the column 2. One side of the opening hole is tightened and opened by a fastening screw, so that the height dimension between the clamping plate 1 and the support plate 3 can be adjusted. The other end of the support plate 3 is provided with a bearing hole for installing the swing centering part.

[0027] The swing centering part includes a swing seat 5, a locking nut 13, a rotating shaft 16, a bearing 14 and a bearing retaining ring 15. The outer ring of the bearing 14 is interference fit with the bearing hole mounting hole of the support plate 3 and is pressed and fixed by the bearing retaining ring 15; the inner ring of the bearing 14 is interference fit with the rotating shaft 16 and is tightened and fixed by a washer and a nut; the outer movable sleeve of the rotating shaft 16 is connected to the swing seat 5 so that the swing seat 5 can realize swing rotation; the upper end of the bearing 14 is provided with a center hole that is matched with a small clearance of the positioning core rod 11, and the coaxiality of the center hole and the inner ring of the bearing 14 is less than 0.01mm to reduce the rotation accuracy and positioning error of the positioning core rod 11. The swing seat is connected to the support plate through the bearing and the other end of the rotating shaft is provided with a center hole that is matched with a small clearance of the positioning core rod. A positioning groove is formed on the swing seat 5 for installing the adjustment part; a screw hole is formed at one end of the swing seat for installing the adjustment screw 10 to realize the axial movement adjustment of the mounting seat 6.

[0028] The positioning core rod 11 includes an upper semi-shaft 111, a lower semi-shaft 112 and a positioning sleeve 113. The upper and lower ends of the positioning sleeve 113 are respectively provided with a top screw hole, and the upper semi-shaft 111 and the lower semi-shaft 112 are connected and fixed by two top screws 114; the upper end of the upper semi-shaft 111 is an outer cylinder with a diameter of 0.4 mm, which is used to calibrate the position of the grinding head 12; the cylinder at the lower end of the lower semi-shaft 112 is matched with a small clearance of the inner hole at the upper end of the rotating shaft.

[0029] The adjusting part comprises a mounting seat 6, an adjusting screw 10, a lateral fixing block 8, and a lateral adjusting screw 9. A boss is provided at the bottom of the mounting seat 6, which is gap-matched with the positioning groove of the swing seat 5; an open slot is provided on one side, and the open slot is gap-matched with the annular groove on the adjusting screw 10, so that the mounting seat 6 can move along the positioning groove of the swing seat 5 when the adjusting screw 10 rotates; a lateral fixing block 8 is installed on one side of the mounting seat 6 by a screw, and the upper part of the mounting seat 6 is slidably connected with the electric grinder mounting seat 7 of the electric grinder mounting part. Preferably, a boss is formed at the lower part of the electric grinder mounting seat 7, which is matched with the groove on the mounting seat 6; an open slot is provided on one side of the electric grinder mounting seat 7, which is gap-matched with the annular groove of the lateral adjusting screw 9, and the lateral adjusting screw 9 passes through the lateral fixing block 8, so that the electric grinder mounting seat 7 can move along the groove of the mounting seat 6 when the lateral adjusting screw 9 rotates.

[0030] The electric grinder installation part comprises an electric grinder 4 , an electric grinder mounting seat 7 and a grinding head 12 . The electric grinder 4 is mounted above the electric grinder mounting seat 7 , and the grinding head 12 of the electric grinder 4 is located above the positioning core rod 11 .

[0031] The swing polishing device is a device that clamps the electric grinder 4 and makes the grinding head 12 swing back and forth along the arc of the spherical surface for polishing. The device can be installed on a general lathe tool holder or a digital lathe tool turret; the rotation center of the grinding head 12 can be adjusted according to the center height of different machine tools; it is designed with an adjustment locking mechanism in both axial and radial directions, which can fine-tune and position the swing arc of the grinding head 12 and the position of the grinding head polishing contact surface; there is a positioning core rod 11 at the swing center of the device, and the core rod positioning surface is a cylinder with a diameter of 0.4mm, which is consistent with the arc of the processed spherical surface. The positioning core rod 11 is the conversion reference for adjusting the relative position between the grinding head and the processed spherical surface. After the position of the grinding head 12 is determined, it can be installed and removed at any time according to needs; the device is designed with a mounting seat 6 for fixing the electric grinder 4; the maximum speed of the electric grinder 4 is 50000rpm, which can meet the linear speed requirements of the grinding head polishing part.

[0032] A method for polishing a micro-sealed spherical surface, using the swing polishing device, comprises the following steps: S1. Use the slit sleeve to install the outer circle of the small end of part A. After the soft claws are processed online, the slit sleeve is clamped to complete the part clamping to ensure the axial and radial installation accuracy when the parts are clamped repeatedly; S2. Use the swing grinding and polishing device to perform grinding and polishing processing; fix the swing grinding and polishing device on the lathe tool holder, install the positioning core rod at the center hole of the swing seat shaft, install the grinder and the grinding head and turn on the power, and adjust the rotation center of the grinding head to the same height as the rotation center of the part.

[0033] Specifically, first determine the axial and radial position coordinates between the center of the positioning mandrel and the center of the arc surface to be polished of the part based on the end face and the outer cylindrical surface of the part. Then move the tool holder to make the grinding head away from the part, and then move the grinding head grinding position to the corresponding position of the positioning mandrel through the device adjustment mechanism, so that the rotation radius of the grinding head grinding position is consistent with the radius of the arc surface to be polished, and then lock the mounting seat and the electric grinder mounting seat respectively; remove the positioning mandrel, and move the grinding head to the arc surface to be polished of the part according to the position coordinate value between the positioning mandrel and the part; start the lathe and the grinder, push and pull the handle of the grinder at a constant speed to make the grinding head repeatedly rub and polish along the arc surface to be polished, and micro-feeding can be achieved by moving the tool holder.

[0034] S3, the machine tool controls the grinding feed rate and operates the swing grinding and polishing device to swing back and forth for grinding and polishing; S4, move the grinding and polishing device away from the parts, remove the parts, clean them, and inspect them under a microscope. If the requirements are met, polishing is completed; S5, otherwise continue to clamp the parts, move the grinding and polishing device to the corresponding position of step S23, and perform operations according to steps S3 and S4 until the parts meet the requirements; S6. Observe the processed surface under a 10x microscope for scratches, abrasions, spots and other defects. If there are defects, repeat steps S1 to S5. After self-testing, proceed to the next step. S7. Parts protection and inspection.

[0035] This solution designs and manufactures a swing grinding and polishing device to install an electric grinder, and formulates a polishing operation method to control the polishing trajectory of the grinding head to polish the sealing spherical surface of the part, ensuring that the processing of the sealing parts of the solenoid valve product meets the design index requirements.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Swinging polishing device, characterized in that: It includes a clamping connection part, a swing centering part, a positioning core rod, an adjusting part, and an electric grinder installation part. The clamping connection part is used to be connected to the lathe tool holder, and the swing centering part is installed on the top; the swing centering part is used to realize swing rotation, and the positioning core rod and the adjusting part are respectively installed on the swing centering part, and the electric grinder installation part is installed on the adjusting part. The positioning core rod is a conversion reference for adjusting the relative position between the grinding head and the processed spherical surface.

2. The oscillating polishing device according to claim 1, characterized in that: The clamping connection part comprises a clamping plate and a supporting plate. The height dimension between the clamping plate and the supporting plate can be adjusted. One end of the supporting plate is equipped with a swing centering part.

3. The oscillating polishing device according to claim 1, characterized in that: The swing centering part includes a swing seat, a rotating shaft and a bearing. The outer ring of the bearing is interference fit with the support plate, and the inner ring is interference fit with the rotating shaft. The outer movably sleeve of the rotating shaft is connected to the swing seat, so that the swing seat can realize swing rotation. The adjusting part is installed on the swing seat; the upper end of the bearing is matched with a small clearance of the positioning core rod.

4. The oscillating polishing device according to claim 3, characterized in that: The positioning mandrel comprises a positioning sleeve and an upper half shaft and a lower half shaft fixedly connected at the upper and lower ends thereof, wherein the upper half shaft is used for calibrating the position of the grinding head; and the lower half shaft is matched with the rotating shaft with a small clearance.

5. The oscillating polishing device according to claim 3, characterized in that: The adjusting part includes a mounting seat, the bottom of which is slidably connected to the swing seat, and an adjusting screw is installed on one side with a clearance fit, so that the mounting seat can move along the positioning groove of the swing seat when the adjusting screw rotates; a lateral fixing block is installed on one side of the mounting seat through a screw, and the top of the mounting seat is slidably connected to the electric grinder mounting seat of the electric grinder mounting part, and an open card groove is provided on one side of the electric grinder mounting seat with a clearance fit with the annular groove of the lateral adjusting screw, and the lateral adjusting screw passes through the lateral fixing block, so that the electric grinder mounting seat can move along the groove of the mounting seat when the lateral adjusting screw rotates.

6. The oscillating polishing device according to claim 1, characterized in that: The electric grinder installation part comprises an electric grinder, an electric grinder installation seat and a grinding head. The electric grinder is installed above the electric grinder installation seat, and the grinding head of the electric grinder is located above the positioning core rod.

7. A method for polishing a micro-sealed sphere, characterized in that: An oscillating polishing device according to any one of claims 1 to 6 is used.

8. The method for polishing a micro-sealed sphere according to claim 7, characterized in that: The method comprises the following steps: S1. Use the slit sleeve to install the outer circle of the small end of the part. After the soft claws are processed online, the slit sleeve is clamped to complete the part clamping; S2. Use the swing grinding and polishing device to perform grinding and polishing processing; fix the swing grinding and polishing device on the lathe tool holder, install the positioning mandrel at the center hole of the swing seat shaft, install the grinder and the grinding head and turn on the power, and adjust the rotation center of the grinding head to the same height as the rotation center of the part to ensure the axial and radial installation accuracy when repeatedly clamping the parts; S3, the machine tool controls the grinding feed rate and operates the swing grinding and polishing device to swing back and forth for grinding and polishing; S4, move the grinding and polishing device away from the parts, remove the parts, clean them, and inspect them under a microscope. If the requirements are met, polishing is completed; S5, otherwise continue to clamp the parts, move the grinding and polishing device to the corresponding position of step S23, and perform operations according to steps S3 and S4 until the parts meet the requirements; S6. Observe the processed surface under a 10x microscope for defects such as scratches, abrasions, spots, etc. If there are defects, repeat steps S1 to S5. After self-testing, proceed to the next step if there are no defects. S7. Parts protection and inspection.

9. The method for polishing a micro-sealed sphere according to claim 8, characterized in that: The specific method of S2 is: first, determine the axial and radial position coordinates between the center of the positioning mandrel and the center of the arc surface to be polished of the part with the end face and the outer cylindrical surface as the reference respectively; then move the tool holder to make the grinding head away from the part, and then move the grinding head grinding position to the corresponding position of the positioning mandrel through the device adjustment mechanism, so that the rotation radius of the grinding head grinding position is consistent with the radius of the arc surface to be polished, and then lock the mounting seat and the electric grinder mounting seat respectively; remove the positioning mandrel, and move the grinding head to the arc surface to be polished of the part according to the position coordinate value between the positioning mandrel and the part.

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