Precise gasket plane finish machining device and method

Abstract

The precision gasket plane finish machining device comprises a first connecting screw rod, a connecting device, a second connecting screw rod and a magnetic suction cup, the connecting device is fixed to a machine tool spindle through the second connecting screw rod, and the magnetic suction cup is fixed to the end of the second connecting screw rod through the first connecting screw rod; a positioning counter bore used for positioning a to-be-machined precision gasket is formed in the end of the magnetic suction cup, the magnetic suction cup is adopted to generate magnetic suction force on the plane of the to-be-machined precision gasket so as to conduct positioning and clamping, then the magnetic suction cup is fixed to the connecting device through the first connecting screw rod, and then a workpiece is machined through turning. According to the precise gasket machining device, the magnetic suction cup is used for adsorbing the end face of the to-be-machined precise gasket, the problem that the to-be-machined precise gasket is burnt due to the local heat dissipation problem in the machining process when the to-be-machined precise gasket is clamped through a chuck is solved, and the problem that local heat dissipation is not uniform can be effectively solved in the grinding machining process.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing, and specifically relates to a precision gasket plane finishing device and a process method, and in particular to a precision gasket plane finishing device and a method. Background Art

[0002] Precision gaskets have precise size and shape, and can provide sealing, isolation and support functions during equipment assembly and operation. For the use of precision gaskets on high-precision equipment, the quality requirements for precision gaskets are very high, especially for important aerospace product components, and the surface of gasket parts is not allowed to be burned. For this type of precision gasket, there are currently four common processing methods.

[0003] 1 On the CNC lathe, use the hydraulic chuck to clamp and position the outer diameter of the part by boring and soft three-jaw, first turn the single-side plane, and then turn the other side plane.

[0004] 2 In the high-precision surface grinder, the electromagnetic suction of the surface grinder worktable is used for clamping and positioning. The single-side surface is ground first, and then the other side surface is ground. This technology, through the research and application of precision gasket surface finishing process methods, has broken through the long-standing technical difficulties that during the grinding process, the high grinding wheel speed and insufficient cooling will cause the parts to produce processing heat deformation, the surface of the parts will have the hidden dangers and risks of burns, and the quality stability cannot meet the quality requirements of aviation products.

[0005] 3. The plane is first ground on a high-precision surface grinder, and then ground by a surface grinder. This technology, through the research and application of precision gasket plane finishing process methods, has broken through the long-standing technical difficulties that during the grinding process, the high grinding wheel speed and insufficient cooling will cause the parts to produce processing heat deformation, the surface of the parts will have hidden dangers and risks of burns, and the quality stability cannot meet the quality requirements of aviation products.

[0006] 4. The plane is first ground on a high-precision surface grinder, and then ground on a double-end surface grinder. This technology breaks through the long-standing technical bottleneck of using a high-precision surface grinder for finishing through research and application of precision gasket plane finishing process methods. Summary of the invention

[0007] The purpose of the present invention is to provide a precision gasket plane finishing device and method to overcome the technical difficulties of the prior art in precision gasket plane finishing such as large grinding thermal deformation and poor part cleanliness control.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A precision gasket plane finishing device comprises a first connecting screw, a connecting device, a second connecting screw and a magnetic suction cup, wherein the connecting device is fixed to a machine tool spindle via the second connecting screw, the magnetic suction cup is fixed to the end of the second connecting screw via the first connecting screw, and a positioning countersunk hole is provided at the end of the magnetic suction cup for positioning the precision gasket to be processed.

[0009] Preferably, a through hole structure is provided in the middle of the connecting device, a countersunk hole is provided on the connecting device, and the connecting device is connected to the main shaft of the processing machine tool through a second connecting screw.

[0010] Preferably, the magnetic suction cup includes a bottom shell, an iron core, a coil and a panel, the panel is arranged at the end of the bottom shell, a cavity structure is formed between the panel and the bottom shell, the iron core and the coil are both arranged in the cavity structure formed between the panel and the bottom shell, and a magnetic power source is arranged in the cavity structure formed between the panel and the bottom shell.

[0011] Preferably, the end of the magnetic suction cup is located at the outer circle of the positioning countersunk hole and is provided with a countersunk hole.

[0012] Preferably, a protrusion is provided on one end of the connecting device that contacts the magnetic suction cup, and a groove matching the protrusion structure on the connecting device is provided on the magnetic suction cup.

[0013] Preferably, the positioning countersunk hole is opened on the panel, and a magnetic switch is arranged on the surface of the bottom shell.

[0014] A precision gasket plane finishing method of the above-mentioned precision gasket plane finishing device comprises the following steps: Install the magnetic chuck to the machine tool spindle and calibrate it, then adsorb the precision gasket to be processed on the magnetic chuck, and adjust the rotation center of the precision gasket to meet the set requirements; Then, the surface of the precision gasket to be processed is turned, and the surface after turning is deburred to complete the finishing of the precision gasket to be processed.

[0015] Preferably, the magnetic chuck is used to adsorb the surface accuracy of the precision gasket to be processed to meet the processing accuracy requirements.

[0016] Preferably, the end face flatness of the magnetic chuck is less than 0.005, and the surface roughness is less than Ra0.4.

[0017] Preferably, when the precision gasket to be processed is turned, the precision gasket to be processed is firstly rough turned to obtain a rough blank of the precision gasket, and then the surface of the rough blank of the precision gasket is fine turned to obtain the precision gasket.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a precision gasket plane finishing device, the precision gasket plane finishing device comprises a first connecting screw, a connecting device, a second connecting screw and a magnetic suction cup, the connecting device is fixed to the main shaft of a machine tool through the second connecting screw, the magnetic suction cup is fixed to the end of the second connecting screw through the first connecting screw, and the end of the magnetic suction cup is provided with a positioning countersunk hole for positioning the precision gasket to be processed. The present application adopts the magnetic suction cup to generate magnetic suction to the plane of the precision gasket to be processed for positioning and clamping, and then uses the first connecting screw to fix the workpiece with the magnetic suction cup on the connecting device, and then uses turning to process the workpiece. The present application uses the magnetic suction cup to adsorb the end face of the precision gasket to be processed, so as to avoid the problem of burning of the precision gasket to be processed due to local heat dissipation during processing caused by clamping the precision gasket to be processed with a chuck, and can effectively avoid the problem of uneven local heat dissipation during grinding.

[0019] Preferably, a through hole structure is provided in the middle part of the connecting device. On the one hand, it can reduce the gravity on the spindle during the overall processing; on the other hand, the provision of the through hole structure can be beneficial to the heat dissipation of the magnetic suction cup 1 connected thereto, further reducing the problem of large grinding thermal deformation caused by overheating during the processing of the precision gasket to be processed.

[0020] Preferably, the end of the magnetic suction cup is located at the outer circle of the positioning countersunk hole and is provided with a countersunk hole. The structural design of the countersunk hole is advantageous in that, on the one hand, the precision gasket to be processed will not be affected by the end face of the magnetic suction cup during loading and unloading, thereby facilitating the removal and placement of the precision gasket to be processed; on the other hand, it is beneficial to the heat dissipation of the precision gasket to be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the results of the precision gasket plane finishing device in an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the structure of the magnetic chuck in an embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of the processing process of the precision gasket to be processed in an embodiment of the present invention.

[0024] In the figure, 1, magnetic suction cup; 2, first connecting screw; 3, connecting device; 4, second connecting screw; 5, positioning countersunk hole; 6, magnetic switch; 7, countersunk hole; 8, machine tool spindle. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] like Figure 1 As shown, the present invention provides a precision gasket plane finishing device, the precision gasket plane finishing device comprises a first connecting screw 2, a connecting device 3, a second connecting screw 4 and a magnetic suction cup 1, the connecting device 3 is fixed to the machine tool spindle 8 through the second connecting screw 4, the magnetic suction cup 1 is fixed to the end of the second connecting screw 4 through the first connecting screw 2, and the end of the magnetic suction cup 1 is provided with a positioning countersunk hole 5 for positioning the precision gasket to be processed. The present application adopts the magnetic suction cup 1 to generate magnetic attraction to the plane of the precision gasket to be processed for positioning and clamping, and then uses the first connecting screw 2 to fix the magnetic suction cup 1 on the connecting device 3, and then uses turning to process the workpiece. The present application uses the magnetic suction cup 1 to adsorb the end face of the precision gasket to be processed, so as to avoid the problem of burning of the precision gasket to be processed due to local heat dissipation during the processing due to the clamping of the precision gasket to be processed by a chuck, and can effectively avoid the problem of uneven local heat dissipation during the grinding process.

[0028] like Figure 1 As shown, the connecting device 3 of the present application adopts a columnar structure, and a through-hole structure is arranged in the middle of the connecting device 3. On the one hand, it can reduce the gravity on the main shaft during the overall processing; on the other hand, the arrangement of the through-hole structure can be beneficial to the heat dissipation of the magnetic suction cup 1 connected thereto, further reducing the problem of large grinding thermal deformation caused by overheating during the processing of the precision gasket to be processed.

[0029] The connecting device 3 is provided with a countersunk hole, which is connected to the main shaft of the processing machine tool through the second connecting screw 4. According to the processing requirements of the main shaft of the processing machine tool, different numbers of countersunk hole structures are provided on the connecting device 3 according to the processing intensity.

[0030] The other end of the connecting device 3 is provided with a connecting portion, and the connecting portion is provided with a connecting hole for connecting to the magnetic suction cup 1. The magnetic suction cup 1 is provided with a corresponding mounting hole. The magnetic suction cup 1 is fixedly connected to the connecting device 3 through a first connecting screw 2.

[0031] In a specific embodiment of the present application, the magnetic suction cup 1 includes a bottom shell, an iron core, a coil and a panel. The panel is arranged at the end of the bottom shell, and a cavity structure is formed between the panel and the bottom shell. The iron core and the coil are both arranged in the cavity structure formed between the panel and the bottom shell. At the same time, a magnetic power source is arranged in the cavity structure formed between the panel and the bottom shell. When the coil is energized, a magnetic field is generated. This magnetic field acts on the workpiece contacting the surface of the panel through the magnetic conductive plate to produce a magnetic adsorption effect. When the coil is powered off, the magnetic force disappears and the workpiece can be easily removed. The characteristics of the electromagnetic suction cup include strong suction, uniform adsorption force, firm and reliable, and fully sealed, no residual magnetism, and strong environmental adaptability. In practical applications, electromagnetic suction cups are often used as machine tool accessories to fix workpieces and improve processing accuracy and efficiency. Positioning countersunk holes 5 are opened on the panel.

[0032] like Figure 2 As shown, in a specific embodiment of the present application, a magnetic switch 6 is provided on the surface of the bottom shell for controlling the on and off of the connection between the internal iron core and the coil and the power supply.

[0033] like Figure 2 As shown, the end of the magnetic suction cup 1 is located at the outer circle of the positioning countersunk hole 5 and is provided with a countersunk hole 7. The structural design of the countersunk hole is advantageous in that the precision gasket to be processed will not be affected by the end face of the magnetic suction cup 1 during loading and unloading, so that it is convenient to take and place the precision gasket to be processed; on the other hand, it is beneficial to the heat dissipation of the precision gasket to be processed. The structural design of the countersunk hole is adopted to form a partial hollow structure on the back of the precision gasket to be processed, which is beneficial to the heat dissipation of the precision gasket to be processed during the processing.

[0034] In a specific embodiment of the present application, a protrusion is provided on the end of the connecting device 3 that contacts the magnetic suction cup 1, and a groove is provided on the end of the magnetic suction cup 1 that contacts the connecting device 3, which is used to match the protrusion structure on the connecting device 3 to achieve the purpose of fast and accurate assembly.

[0035] In another embodiment of the present invention, a precision gasket plane finishing method based on the above-mentioned precision gasket plane finishing device is provided, comprising the following steps: Install the magnetic chuck to the machine tool spindle and calibrate it, then adsorb the precision gasket to be processed on the magnetic chuck, and adjust the rotation center of the precision gasket to meet the set requirements; Then, the surface of the precision gasket to be processed is turned, and the surface after turning is deburred to complete the finishing of the precision gasket to be processed.

[0036] In the specific implementation of the present application, when processing the precision gasket to be processed, it is necessary to select a suitable tool according to the material and processing requirements of the gasket; specifically, a carbide tool should be used for titanium alloy gaskets, and a YG type carbide with a low affinity to titanium alloy should be selected. A high-speed steel turning tool can be used for polytetrafluoroethylene gaskets.

[0037] Cutting parameter setting: Set the cutting speed, feed rate, and cutting depth according to the tool, material, and processing requirements. In the specific implementation of the present application, when the precision gasket to be processed is turned, the precision gasket to be processed is firstly rough-turned to obtain a rough blank of the precision gasket, and then the surface of the rough blank of the precision gasket is fine-turned to obtain the precision gasket.

[0038] In the specific implementation of the present application, the magnetic chuck of the present application is used to absorb the surface accuracy of the precision gasket to be processed to meet the set requirements. Specifically, the outer diameter size of the end face of the magnetic chuck can be turned and trimmed, and it needs to be trimmed 2-3 times until the flatness is within 0.005 and the surface roughness is Ra0.4, which meets the precise positioning in the diameter direction and solves the problems of uneven positioning surface, poor flatness, and poor stability of processing dimensional quality.

[0039] The magnetic switch 6 on the outer surface of the magnetic chuck is used to control the magnetic suction force to position, clamp and release the plane of the precision gasket.

[0040] When machining the surface of the precision gasket to be machined, first use one of the machining surfaces as the positioning reference surface for adsorption and clamping, machine the other machining surface, and then fine-machine the positioning reference surface. Figure 3 As shown, the A surface of the precision gasket to be processed is processed first, and then the B surface is clamped with the A surface as the positioning reference surface, and the B surface is processed to achieve a precision gasket plane thickness tolerance of 0.01 and a flatness of less than 0.005mm.

[0041] The present invention can realize the turning finishing of the precision gasket plane within the thickness tolerance of 0.01 and the flatness of 0.005 on a CNC lathe. The present invention adopts the processing method of precision turning plane. Compared with the processing method of grinding plane, the precision turning plane method not only reduces the cutting line speed, but also improves the line contact between the grinding wheel and the workpiece during the processing process to the point contact between the turning blade tip arc and the workpiece, solving the technical problem of large grinding thermal deformation in the finishing of the precision gasket plane. During the turning process, the line speed is relatively low, and no excessive cutting heat is generated. There is no risk of burns on the surface of the parts, and the quality stability is high. The present invention improves the "grinding plane + grinding plane" to a more concise and efficient full process flow of the precision turning plane, reduces the grinding process, and controls the cleanliness of the parts more effectively.

[0042] Through the research and application of this precision gasket plane finishing process method and device, the processing efficiency of precision gaskets has been improved, saving an average of 1 minute of processing time for each part, and the processing efficiency has been increased by about 33.3%. The processing quality and production efficiency have been significantly improved, and the dimensional accuracy, flatness and surface roughness have high consistency and stability.

Claims

1. A precision gasket plane finishing device, characterized in that: The invention comprises a first connecting screw (2), a connecting device (3), a second connecting screw (4) and a magnetic suction cup (1); the connecting device (3) is fixed to a machine tool spindle (8) via the second connecting screw (4); the magnetic suction cup (1) is fixed to the end of the second connecting screw (4) via the first connecting screw (2); and a positioning countersunk hole (5) is provided at the end of the magnetic suction cup (1) for positioning a precision gasket to be processed.

2. A precision gasket plane finishing device according to claim 1, characterized in that: A through hole structure is arranged in the middle of the connecting device (3), and a countersunk hole is arranged on the connecting device (3), which is connected to the main shaft of the processing machine tool via a second connecting screw (4).

3. A precision gasket plane finishing device according to claim 1, characterized in that: The magnetic suction cup (1) comprises a bottom shell, an iron core, a coil and a panel, wherein the panel is arranged at the end of the bottom shell, a cavity structure is formed between the panel and the bottom shell, the iron core and the coil are both arranged in the cavity structure formed between the panel and the bottom shell, and a magnetic power source is arranged in the cavity structure formed between the panel and the bottom shell.

4. A precision gasket plane finishing device according to claim 1, characterized in that: The end of the magnetic suction cup (1) is located at the outer ring of the positioning countersunk hole (5) and is provided with a countersunk hole (7).

5. A precision gasket plane finishing device according to claim 1, characterized in that: A protrusion is provided on one end of the connecting device (3) that contacts the magnetic suction cup (1), and a groove matching the protrusion structure on the connecting device (3) is provided on the magnetic suction cup (1).

6. A precision gasket plane finishing device according to claim 3, characterized in that: A positioning countersunk hole (5) is formed on the panel, and a magnetic switch (6) is provided on the surface of the bottom shell.

7. A precision gasket plane finishing method based on the precision gasket plane finishing device according to claim 1, characterized in that: The following steps are involved: Install the magnetic chuck to the machine tool spindle and calibrate it, then adsorb the precision gasket to be processed on the magnetic chuck, and adjust the rotation center of the precision gasket to meet the set requirements; Then, the surface of the precision gasket to be processed is turned, and the surface after turning is deburred to complete the finishing of the precision gasket to be processed.

8. The method for finishing the plane of a precision gasket according to claim 7, characterized in that: The magnetic chuck is used to absorb the surface accuracy of the precision gasket to be processed to meet the processing accuracy requirements.

9. The method for finishing the plane of a precision gasket according to claim 8, characterized in that: The end face flatness of the magnetic chuck is less than 0.005, and the surface roughness is less than Ra0.

4.

10. The method for finishing the plane of a precision gasket according to claim 7, characterized in that: When the precision gasket to be processed is turned, the precision gasket to be processed is firstly roughly turned to obtain a precision gasket rough blank, and then the surface of the precision gasket rough blank is finely turned to obtain the precision gasket.

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