Method for fast cutting of insulating annular film

Abstract

The application relates to a method for rapidly cutting an insulating annular film, and relates to the field of mechanical processing. According to the inner diameter and the outer diameter of the annular film to be processed, an adjustable double-blade cutter is adjusted, the adjustable double-blade cutter comprises a support, a crossbeam connected to the support, a first cutter and a second cutter connected to the crossbeam, the distance between the second cutter and the center line of the support and the distance between the first cutter and the second cutter are adjusted, the center line of the support is a cutting axis, the first cutter and the second cutter are connected to the same side of the support, and the center line of the first cutter, the center line of the second cutter and the center line of the support are coplanar; alcohol is used to wet any two layers of insulating films of a multilayer insulating film, and the multilayer insulating film is fixed; the first cutter and the second cutter are used to cut the insulating film with the center line of the support as the rotation shaft, and an annular film is obtained. The annular film with a thickness of 0.04 mm can be rapidly and highly-precisely cut.

Description

Technical Field

[0001] This invention relates to the field of machining, and in particular to a method for rapid cutting of annular insulating films suitable for rail / attitude control engines. Background Technology

[0002] Orbit / attitude control engines are widely used in various spacecraft and missile weapons. Their main function is to provide control force and torque for orbit changes and attitude control during spacecraft flight. The solenoid valve is a core component of the orbit / attitude control engine, directly determining the engine's start-up and shutdown, steady-state stability, and repeatability. To ensure control accuracy, the solenoid valve control coil is protected by a ring-shaped insulating film.

[0003] Traditional ring-shaped insulating films are produced using ring-shaped cutters, with a single cutter costing approximately 10,000 yuan and a production cycle of about 3 months. Furthermore, the ring-shaped cutter is size-dependent, resulting in poor processing adaptability.

[0004] A typical small gasket compass cutter includes a positioning foot and a sliding rod. The positioning foot is connected to the sliding rod, allowing the sliding rod to rotate around the positioning foot. It also includes a slider assembly with a blade mounted on its bottom. The slider assembly is slidably connected to the sliding rod, allowing the distance between the slider assembly and the positioning foot to be adjustable. The slider assembly has a locking structure to prevent relative movement between the slider assembly and the sliding rod. It can only process one product at a time, resulting in low processing efficiency and making it unsuitable for industrial mass production. It is primarily used in small workshops for glass cutting, gasket cutting, and other similar applications.

[0005] With the successive implementation of major national aerospace projects such as the manned space station project, the fourth phase of the lunar exploration project, and the deep space exploration project, as well as major strategic missile weapon models, higher requirements have been placed on the variety and development cycle of orbit / attitude control engine solenoid valves. The inefficiency and high cost of traditional annular cutters are difficult to meet the needs of rapid development, and there is an urgent need for a fast and low-cost annular film cutting method. Summary of the Invention

[0006] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a method for rapid cutting of insulating annular films, which can quickly and accurately cut annular films with a minimum thickness of 0.04 mm.

[0007] The technical solution of this invention is:

[0008] A method for rapid cutting of an insulating annular film includes:

[0009] Based on the inner and outer diameters of the annular film to be processed, adjust the adjustable double-edged cutter. The adjustable double-edged cutter includes a support, a crossbeam connected to the support, and a first cutter and a second cutter connected to the crossbeam. Adjust the distance between the second cutter and the center line of the support, as well as the distance between the first cutter and the second cutter. The center line of the support is the cutting axis. The first cutter and the second cutter are connected to the same side of the support, and the center lines of the first cutter, the second cutter, and the center line of the support are coplanar. Wet any two layers of the multilayer insulating film with alcohol and fix the multilayer insulating film. Using the center line of the support as the axis of rotation, use the first cutter and the second cutter to cut the insulating film to obtain the annular film.

[0010] In one specific embodiment, the alcohol is 70% alcohol.

[0011] In one specific embodiment, the insulating film is fixed using a fixing fixture, which includes a main body, pins, and a pressure plate. The main body has a fixing groove on its surface. Two pins are provided and are respectively wrapped around the two ends of the insulating film. The pins hang down at both ends of the fixing groove. The pressure plate is located above the insulating film and pressed into the fixing groove. The pressure plate has multiple through holes.

[0012] In one specific embodiment, the diameter of the through hole is 1.0-1.5 times the outer diameter of the annular film to be cut.

[0013] In one specific embodiment, the insulating film is fixed using a fixing fixture, which includes a pad located in a fixing groove, with the insulating film located between the pad and the pressure plate; the fixing fixture also includes a clamping bolt, which is threaded to the main body, and the head of the clamping bolt clamps the pressure plate.

[0014] In one specific embodiment, the fixed tooling package has a left tool holder and a right tool holder connected to the crossbeam. Both the left and right tool holders have mounting holes. The crossbeam passes through the mounting holes. The left tool holder is threaded with a first fastening screw, and the right tool holder is connected with a positioning screw. The ends of both the first fastening screw and the positioning screw can extend into the mounting holes.

[0015] In one specific embodiment, the insulating film thickness of the fixture is 0.04 mm or more.

[0016] In one specific embodiment, the flatness of the insulating film after being fixed by the fixing fixture is 0.02mm.

[0017] In one specific embodiment, the outer diameter of the annular film in the fixing fixture is 6-50 mm.

[0018] In one specific embodiment, the step of fixing the insulating film by the fixing fixture includes: wrapping the two ends of the multilayer insulating film with pins respectively, cutting and tightening each layer of film, with the distance between the two pins being greater than the length of the main body; placing a pad on the bottom of the fixing groove of the main body, then placing the wrapped insulating film on the pad, and suspending the pins in a free hanging state, pressing in the pressure plate and tightening it with the clamping bolts.

[0019] In one specific embodiment, the number of layers of the insulating film in the fixing fixture is 10-15.

[0020] In summary, this application includes at least the following beneficial technical effects:

[0021] (1) A fast and low-cost method for cutting 0.04mm thick annular films is provided. A combined adjustable double-edged cutter is designed, which is precise in centering and easy to operate. By adjusting the distance between the double-edged cutter and the center cutter, the processing of solenoid valve films with a winding diameter of 6-50mm is realized. A fixed fixture is designed to reliably fix the film in the processing area, avoiding warping, movement deformation and wrinkling when clamping multiple films. Alcohol is creatively used to achieve reliable bonding of multiple films. After processing, it evaporates on its own and requires no special treatment. Through the use of the fixed fixture and alcohol, the film is stably fixed, improving the product processing accuracy. At the same time, there is no need for repeated clamping, and hundreds of films can be processed at once.

[0022] (2) This invention has the characteristics of low cost, high adaptability and high processing efficiency, which solves the problems of low efficiency and high cost of traditional ring cutter, and meets the needs of multi-variety and large-scale research and production of the engine. Attached Figure Description

[0023] Figure 1 This is a front view of a combination adjustable double-edged cutter;

[0024] Figure 2 This is a structural diagram of a fixed tooling.

[0025] Explanation of reference numerals in the attached drawings: 11, support; 121, second fastening screw; 12, crossbeam; 18, left cutter holder; 181, first cutter; 14, right cutter holder; 141, second cutter; 122, first fastening screw; 19, positioning screw; mounting hole; 17, first screw; 16, first bolt; 15, nut;

[0026] 21. Main body; 22. Pad; 23. Clamping bolt; 24. Column pin; 26. Pressure plate. Detailed Implementation

[0027] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0028] This application discloses a method for rapid cutting of an insulating annular film. The method uses an adjustable double-edged cutter and a fixed fixture, such as... Figure 1 As shown, the adjustable double-edged cutter includes a support 11, a crossbeam 12 connected to the support 11, and a first cutter 181 and a second cutter 141 connected to the crossbeam 12. The first cutter 181 and the second cutter 141 are adjustablely connected to the crossbeam 12 along the length direction of the crossbeam 12. The first cutter 181 and the second cutter 141 are located on the same side of the support 11, and the first cutter 181 is located on the side of the second cutter 141 away from the support 11. The center line of the first cutter 181, the center line of the second cutter 141 and the center line of the support 11 are coplanar.

[0029] The crossbeam 12 passes through the support 11, and a second fastening screw 121 is threaded onto the support 11. The end of the second fastening screw 121 can contact the crossbeam 12. The connection between the crossbeam 12 and the support 11 is achieved by the second fastening screw 121.

[0030] A left cutter holder 18 and a right cutter holder 14 are connected to the crossbeam 12. Both the left cutter holder 18 and the right cutter holder 14 have mounting holes through which the crossbeam 12 passes. The left cutter holder 18 is threaded with a first fastening screw 122, and the right cutter holder 14 is connected with a positioning screw 19. The ends of both the first fastening screw 122 and the positioning screw 19 can extend into the mounting holes. A first cutter 181 is connected to the left cutter holder 18, and a second cutter 141 is connected to the right cutter holder 14. The first cutter 181 and the second cutter 141 are directly opposite each other. A first screw 17 passes through the first cutter 181 and is threaded to the left cutter holder 18. A first bolt 16 passes through the second cutter 141 and is connected to the right cutter holder 14. A nut 15 is threaded to the end of the first bolt 16 that passes through the right cutter holder 14. By loosening the positioning screw 19 and the first fastening screw 122, the left cutter holder 18 and the right cutter holder 14 can slide along the crossbeam 12, thereby adjusting the positions of the first cutter 181 and the second cutter 141 to cut annular films with different inner and outer diameters. Of course, the first cutter 181 and the second cutter 141 can also be fixed to the left cutter holder 18 and the right cutter holder 14 in other ways. For example, the second cutter 141 can also be fixed to the right cutter holder 14 by a screw passing through it and the screw being threaded onto it.

[0031] like Figure 2As shown, the fixing fixture includes a main body 21, a pad 22, clamping bolts 23, pins 24, and a pressure plate 26. The main body 21 has a fixing groove on its surface. Two pins 24 are provided and wound around both ends of the insulating film. The pad 22 is located within the fixing groove, and the insulating film is located on the pad 22. The pins 24 hang down at both ends of the fixing groove. The pressure plate 26 is located above the insulating film and pressed into the fixing groove. Multiple clamping bolts 23 are threaded to the main body 21, and the heads of the clamping bolts 23 press against the surface of the pressure plate 26, thereby tightening the pressure plate 26. In this embodiment, the clamping bolts 23 are evenly distributed on both sides of the fixing groove. Through the arrangement of the pins 24 and the pressure plate 26, the unevenness of the fixed insulating film can reach 0.02 mm. The pressure plate 26 has multiple through holes, the diameter of which is 1.3 times the outer diameter of the annular film to be cut. Each through-hole position is used for cutting the annular film. The end of the adjustable double-edged cutter support 11 is pressed into the middle of the through-hole. Rotating the support 11 causes the first cutter 181 and the second cutter 141 to cut the insulating film.

[0032] A method for rapid cutting of an insulating annular film specifically includes the following steps:

[0033] (1) Install and adjust the combined cutting tools according to the inner and outer diameters of the insulating annular film.

[0034] The specific assembly process for the combined cutting tools is as follows: First, fix the right tool holder 14 to the crossbeam 12 with the positioning screw 19. Then, fix the support 11 to the crossbeam 12 with the second fastening screw 121. On the tool setting device, adjust L2 to the inner radius R1 of the annular film and tighten the second fastening screw 121. Next, fix the left tool holder 18 to the crossbeam 12 with the first fastening screw 122. Adjust L1 to the width R2-R1 of the annular film and tighten the first fastening screw 122.

[0035] (2) After trial processing, measure the size of the annular film and adjust the cutting tool.

[0036] The adjustment method is as follows: On the tool setter, loosen the second fastening screw 121 and the first fastening screw 122, adjust the center distance L2 between the right tool holder 14 and the support 11 and the distance L1 between the right tool holder 14 and the left tool holder 18, and then tighten the second fastening screw 121 and the first fastening screw 122 again.

[0037] (3) Install the fixture, insert multiple layers of insulating film, and lubricate the adjacent layers of insulating film with 70% alcohol, and tighten the pressure plate 26.

[0038] The specific installation process for the fixed fixture is as follows: Multiple layers of insulating film are stacked together, and adjacent insulating films are lubricated with 70% alcohol. The ends of the multiple insulating films are wrapped around connecting pins. The insulating film has slight adhesion and can be fixed to the pins. The pins tighten the insulating film by their own weight. Ten layers of insulating film are optimal, and each layer must be taut. The distance between the two pins 24 must be greater than the length of the main body 21. A pad 22 is placed in the fixing groove of the main body 21, and the wrapped insulating film is placed on the pad 22. The pins 24 at both ends of the insulating film are suspended in a free-hanging state. The pressure plate 26 is pressed into the fixing groove and onto the surface of the insulating film. The clamping bolt 23 is threaded onto the main body 21, and the head of the clamping bolt 23 presses against the surface of the pressure plate 26.

[0039] (4) Load the tool from step 1 and process it on a CNC milling machine. The double blades cut the insulating film simultaneously.

[0040] Specifically, the process involves using a CNC milling and drilling machine as the processing equipment, connecting the support 11 to the CNC milling and drilling machine, aligning the center of the support 11 with the center of the base hole of the pressure plate 26, and compiling a CNC machining program based on the number of holes in the pressure plate 26 to process the annular film. This allows the center of the support 11 to press against the center of the annular film, and the double blades to cut the annular film simultaneously without wrinkling.

[0041] (5) Cutting speed 1000-1200 rpm, feed rate 0.5 mm / rpm, lubricate with 70% alcohol.

[0042] Specifically, the process includes: before cutting, applying 70% alcohol to the cutting area using a brush or sprayer, ensuring the amount of alcohol added is such that there is some residue on the surface of the insulating film; then, machining is performed using a milling machine with a spindle speed of 1000-1200 rpm and a feed rate of 0.5 mm / rpm. The addition of alcohol in this step, and during the fixing process with fixtures, prevents the insulating film from wrinkling due to static electricity, wets it during cutting, and the alcohol requires no further treatment as it evaporates naturally.

[0043] The first and second cutters of this application are located at one end of the crossbeam, and are also located on the cutting radial direction centered on the support. When cutting the annular film, the first and second cutters cut simultaneously in one direction during operation, and can simultaneously process the inner circle and outer circle of the annular film at the same radial position. When processing a thin insulating film (0.1mm thick), the problem of the insulating film quickly curling up is overcome where the blade passes, improving the flatness of the insulating film throughout the cutting process and avoiding failure due to unevenness causing the film to tear or roundness to exceed the tolerance.

[0044] This application also designs a clamping fixture for pressing the insulating film, which can press the insulating film to achieve an initial unevenness of 0.02mm, thereby improving the accuracy during the processing. During the pressing process, the insulating film is lubricated with 70% alcohol to ensure that the insulating film will not wrinkle due to static electricity during the cutting process.

[0045] This application can process insulating films with diameters ranging from 6 to 50 mm, with a minimum diameter of 6 mm. The minimum thickness of the processed insulating film can reach 0.04 mm. Furthermore, the inner and outer diameter accuracy of the resulting gasket can reach ±0.05 mm.

[0046] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A method for fast cutting of an insulating annular film, characterized in that, The application relates to a cutting device for cutting a multi-layer insulating film into a ring-shaped film. According to the inner diameter and the outer diameter of the ring-shaped film to be processed, the adjustable double-blade cutter is adjusted; the adjustable double-blade cutter comprises a support (11), a crossbeam (12) connected to the support (11), a first cutter (181) and a second cutter (141) connected to the crossbeam (12), the distance between the second cutter (141) and the center line of the support (11) is adjusted, the center line of the support (11) is a cutting axis, the distance between the first cutter (181) and the second cutter (141) is adjusted, the first cutter (181) and the second cutter (141) are connected to the same side of the support (11), and the center line of the first cutter (181), the center line of the second cutter (141) and the center line of the support (11) are coplanar; Any two layers of the multi-layer insulating film are wetted by using alcohol, and the multi-layer insulating film is fixed. The first cutter (181) and the second cutter (141) are used to cut the insulating film with the center line of the support (11) as the rotation axis, so that the ring-shaped film is obtained. The alcohol is 70% alcohol. The fixed tool for fixing the insulating film comprises a main body (21), a column pin (24) and a pressing plate (26), a fixing groove is formed on the surface of the main body (21), the column pin (24) is arranged on two ends of the insulating film and is hung freely, the column pin (24) falls on two ends of the fixing groove, the pressing plate (26) is located above the insulating film and is pressed into the fixing groove, and a plurality of through holes are formed in the pressing plate (26); the diameter of the through hole is 1.3 times of the outer diameter of the ring-shaped film to be cut, and each through hole is used for cutting the ring-shaped film. The thickness of the insulating film is greater than 0.04 mm, and the outer diameter of the ring-shaped film is 6-50 mm.

2. The method of claim 1, wherein: The fixed tool further comprises a backing plate (22), and the backing plate (22) is located in the fixing groove and the insulating film is located between the backing plate (22) and the pressing plate (26). The fixed tool further comprises a pressing bolt (23), and the pressing bolt (23) is threadedly connected to the main body (21) and the head of the pressing bolt (23) presses the pressing plate (26).

3. The method of claim 1, wherein: The crossbeam (12) is connected with a left cutter holder (18) and a right cutter holder (14), the left cutter holder (18) and the right cutter holder (14) are both provided with mounting holes, the crossbeam (12) passes through the mounting holes, the left cutter holder (18) is threadedly connected with a first fastening screw (122), the right cutter holder (14) is connected with a positioning screw (19), and the ends of the first fastening screw (122) and the positioning screw (19) can extend into the mounting holes.

4. The method of claim 1, wherein: The unevenness of the insulating film fixed by the fixed tool is 0.02 mm.

5. The method of claim 1, wherein the method further comprises: The step of fixing the multi-layer insulating film comprises the following steps: The two ends of the multi-layer insulating film are wound around the column pin (24), each layer of the film is taut, and the distance between the two column pins (24) is greater than the length of the main body (21); the backing plate (22) is placed on the bottom of the fixing groove of the main body (21), then the wound insulating film is placed on the backing plate (22) and the column pin (24) is hung in a freely falling state, the column pin (24) is pressed into the pressing plate (26) and is fastened by the pressing bolt (23).

6. The method of claim 1, wherein: The number of layers of the insulating film is 10-15.

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