A method for machining high-precision curved surfaces on carbon fiber strips

Abstract

This invention discloses a method for machining high-precision arcuate surfaces on carbon fiber strips. The method involves fixing the carbon fiber strip to a fixing fixture for machining. The fixing fixture includes at least a clamping assembly, a first clamping plate cooperating with the clamping assembly, and at least one second clamping plate cooperating with the clamping assembly and selectively chosen from the first clamping plate. A support pad is fixed to the side of the second clamping plate, and the upper surface of the support pad is arcuate. This method enables the machining of large-sized arcuate surfaces on the surface of carbon fiber strips, and the machining accuracy of the arcuate surface is high, with an error of only ±1 mil.

Description

Technical Field

[0001] This invention belongs to the field of precision machining technology and relates to a method for processing the surface of long strip-shaped articles. Specifically, it is a method for processing high-precision arc-shaped surfaces on the surface of carbon fiber strips, especially a method for processing high-precision arc-shaped surfaces on both corresponding surfaces of the fiber strip. Background Technology

[0002] Carbon fiber (CF) is a new type of high-strength, high-modulus fiber material with a carbon content exceeding 90%. Its most notable characteristics are its light weight and high strength. The density of carbon fiber is only about 1.7 g / cm³. 3 It is less than a quarter the weight of steel, but its strength is several times that of steel; textile fibers are soft and easy to process; it has low electrochemical activity and good corrosion resistance, which can effectively extend its service life. Carbon fiber strips are made by processing carbon fibers into strips, and clamps are needed to fix them during processing.

[0003] Chinese utility model patent application number 201820048841.3 discloses a carbon fiber strip processing fixing fixture, including a vertical baffle. A mounting pad is fixed to the upper right side of the vertical baffle. A fixture head is connected to the right end of the mounting pad, and a connecting rod is installed at the right end of the fixture head. A buffer pad is connected to the lower end of the fixture head, and a groove is provided in the middle of the buffer pad. A protective pad is provided on the right side of the middle of the vertical baffle, and a base is installed on the lower right side of the vertical baffle. A sleeve is fixed to the upper left side of the base, and a support rod is connected to the upper end of the sleeve. A support block is connected to the lower end of the support rod, and a hydraulic oil pipe is provided at the lower end of the support block. A hydraulic valve is installed inside the right end of the hydraulic oil pipe, and a hydraulic oil tank is provided at the lower end of the hydraulic oil pipe. A control lever is provided at the left end of the hydraulic oil tank. A moving groove is provided on the upper right side of the base, and a moving block is installed at the upper end of the moving groove. The application discloses the use of a fixing fixture to fix carbon fiber strips for processing. However, such a fixing fixture cannot avoid mechanical vibration of the carbon fiber strips during processing, making it difficult to meet the processing accuracy requirements. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for processing a high-precision arc-shaped surface on the surface of carbon fiber strips.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a method for processing a high-precision arc-shaped surface on the surface of a carbon fiber strip, wherein the carbon fiber strip is fixed on a fixing fixture for processing, the fixing fixture includes at least a clamping component, a first clamping plate that cooperates with the clamping component, and at least one second clamping plate that cooperates with the clamping component and is selected from the first clamping plate, a support pad is fixed on the side of the second clamping plate, and the upper surface of the support pad is an arc-shaped surface;

[0006] Includes the following steps:

[0007] (a) Clamp the carbon fiber strip to be processed on the fixing fixture so that either side of the carbon fiber strip is in close contact with the side of the first clamping plate;

[0008] (b) Fix the fixture on the operating table of the machining center, and make the cutting head of the machining center rough machine the surface of the carbon fiber strip in a direction parallel to the end face of the carbon fiber strip to form a first arc-shaped machining surface on the corresponding surface; the machining allowance of the rough machining is 0.05-0.5mm, and the machining parameters of the rough machining cutting head are: feed rate 0.5-1mm / s, feed amount 0.02-0.03mm;

[0009] (c) Remove the fixing fixture from the operating table, rotate the carbon fiber strip 180° and clamp it on the fixing fixture so that the other side of the carbon fiber strip is attached to the side of the second clamping plate, so that the first arc-shaped processing surface is supported on the support pad (41); repeat step (b) to process and form the second arc-shaped processing surface.

[0010] (d) Continue to finish the second arc-shaped machining surface. The finishing allowance is 0.01-0.02 mm. The machining parameters of the finishing cutter are: feed rate 0.1-0.2 mm / s and feed amount 0.02-0.03 mm.

[0011] (e) Remove the fixing fixture from the operating table, rotate the carbon fiber strip 180° and clamp it on the fixing fixture so that one side of the carbon fiber strip is attached to the side of the second clamping plate, so that the finished second arc-shaped machined surface is supported on the support pad; repeat step (d) to process and form the finished first arc-shaped machined surface.

[0012] Ideally, it also includes the following steps:

[0013] (f) Remove the fixing clamp from the operating table, rotate the carbon fiber strip 90° and clamp it on the fixing clamp so that another side of the carbon fiber strip is in close contact with the side of the first clamping plate.

[0014] (g) Repeat steps (b)-(e) to process the third and fourth arc-shaped machined surfaces after finishing, respectively.

[0015] Ideally, when there are multiple second clamping plates, the support pads on different second clamping plates have the same or different sizes.

[0016] Optimally, the clamping assembly includes a lower clamping mechanism, an upper clamping mechanism adjustablely mounted on the lower clamping mechanism, and a positioning mechanism adjustablely mounted on the side of the upper clamping mechanism. The second clamping plate is detachably mounted on the upper clamping mechanism, and the lower clamping mechanism is detachably mounted on the operating table of the machining center.

[0017] Furthermore, the lower clamping mechanism includes a support base plate, a groove formed in the support base plate and extending through its upper surface, a slider slidably disposed in the groove, a support seat mounted on the side of the support base plate and protruding from the upper surface of the support base plate, a limiting block detachably embedded in the support seat plate, and an adjusting screw clamped between the support seat plate and the limiting block and passing through the slider plate.

[0018] Furthermore, the upper clamping mechanism includes a first clamping block fixed to the upper surface of the support substrate and a second clamping block connected to the slider and cooperating with the first clamping block. Both the first clamping block and the second clamping block are perpendicular to the slide groove. When the adjusting screw is rotated, the second clamping block moves in the direction of the first clamping block or moves away from the first clamping block to adjust the distance between it and the first clamping block and clamp the first clamping plate or the second clamping plate.

[0019] Furthermore, the positioning mechanism includes an L-shaped extension plate detachably mounted on the side of the first clamping block via a first fastener, and a limiting plate adjustablely mounted on the L-shaped extension plate and disposed opposite to the second clamping block.

[0020] Furthermore, the L-shaped extension plate has at least two slots extending along the direction of the first clamping block, and the limiting plate is connected to the L-shaped extension plate by multiple second fasteners passing through the slots.

[0021] The beneficial effects of the technical solution provided by the present invention are as follows: The method of processing high-precision arc-shaped surfaces on the surface of carbon fiber strips by the present invention, through the use of a fixed fixture with a specific structure and process steps, can process arc-shaped surfaces of large size on the surface of carbon fiber strips, and the processing accuracy of the arc-shaped surfaces is high, with an error of only ±1 mil. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the carbon fiber strip structure of the present invention;

[0024] Figure 2 This is a partial structural diagram of the fixing clamp of the present invention;

[0025] Figure 3 This is a simplified schematic diagram of the fixing clamp of the present invention holding a carbon fiber strip;

[0026] Figure 4 This is a schematic diagram of the structure of the fixing clamp of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] In the following description, for the sake of clarity and conciseness, not all of the multiple components shown in the figures are described. The figures illustrate multiple components to provide a disclosure fully achievable by those skilled in the art. The operation of many components will be familiar and obvious to those skilled in the art.

[0029] like Figure 1 The carbon fiber strip 1' shown has a first arc surface 11' formed in the middle of its two corresponding sides and a second arc surface 12' formed in the middle of its other two corresponding sides; the end face size of the carbon fiber strip 1' is 5-10mm × 2-7mm and the length is 10-30cm.

[0030] The method for machining a high-precision arc-shaped surface on the surface of the aforementioned carbon fiber strip involves fixing the carbon fiber strip 1' onto a fixing fixture for machining. The fixing fixture includes at least a clamping assembly, a first clamping plate that cooperates with the clamping assembly, and at least one second clamping plate 4 that cooperates with the clamping assembly and is selected from the first clamping plate. A support pad 41 is fixed on the side of the second clamping plate 4, and the upper surface of the support pad 41 is an arc-shaped surface (the thickness of the arc-shaped surface corresponds to the depth of the aforementioned first arc surface 11' or second arc surface 12'). In this embodiment, when there are multiple second clamping plates 4, the support pads 41 on different second clamping plates 4 have the same or different sizes. If the support pads 41 have the same size, multiple second clamping plates 4 can be aligned and clamped on the clamping assembly, so that multiple carbon fiber strips 1' can be clamped by the fixing fixture. This allows multiple carbon fiber strips 1' to be processed at the same time, which greatly improves the processing efficiency of carbon fiber strips 1'. When the support pads 41 have different sizes, different specifications of arc surfaces on the surface of carbon fiber strips 1' can be processed by replacing different second clamping plates 4. This eliminates the need to replace the fixing fixture and greatly reduces production costs.

[0031] The method for machining high-precision curved surfaces on the surface of carbon fiber strips includes the following steps:

[0032] (a) Clamp the carbon fiber strip to be processed 1' on the fixing fixture so that any side of the carbon fiber strip is in close contact with the side of the first clamping plate;

[0033] (b) Fix the fixture on the operating table of the machining center, and make the cutting head of the machining center rough machine the surface of the carbon fiber strip 1' in a direction parallel to the end face of the carbon fiber strip 1' to form a first arc-shaped machining surface on the corresponding surface; the machining allowance of the rough machining is 0.05~0.5mm, and the machining parameters of the rough machining cutting head are: feed rate 0.5~1mm / s, feed amount 0.02-0.03mm;

[0034] (c) Remove the fixing fixture from the operating table, rotate the carbon fiber strip 1' 180° and clamp it on the fixing fixture so that the other side of the carbon fiber strip is attached to the side of the second clamping plate 4, so that the first arc-shaped processing surface is supported on the support pad 41; repeat step (b) to process and form the second arc-shaped processing surface.

[0035] (d) Continue to finish the second arc-shaped machining surface. The finishing allowance is 0.01-0.02 mm. The machining parameters of the finishing tool are: feed rate 0.1-0.2 mm / s, feed rate 0.02-0.03 mm.

[0036] (e) Remove the fixing fixture from the operating table, rotate the carbon fiber strip 180° and clamp it on the fixing fixture so that one side of the carbon fiber strip is attached to the side of the second clamping plate (4) so ​​that the finished second arc-shaped machining surface is supported on the support pad 41; repeat step (d) to process and form the finished first arc-shaped machining surface.

[0037] When all four sides of the carbon fiber strip 1' need to be processed, the following steps are also included:

[0038] (f) Remove the fixing clamp from the operating table, rotate the carbon fiber strip 90° and clamp it on the fixing clamp so that another side of the carbon fiber strip is in close contact with the side of the first clamping plate.

[0039] (g) Repeat steps (b)-(e) to process the third and fourth arc-shaped machined surfaces after finishing, respectively.

[0040] In this embodiment, the clamping assembly includes a lower clamping mechanism 1, an upper clamping mechanism 2 adjustablely mounted on the lower clamping mechanism 1, and a positioning mechanism 3 adjustablely mounted on the side of the upper clamping mechanism 2. The second clamping plate 4 is detachably mounted on the upper clamping mechanism 2, and the lower clamping mechanism 1 is detachably mounted on the operating table of the machining center.

[0041] The lower clamping mechanism 1 includes a support base plate 11, a groove 12 formed within the support base plate 11 and extending through its upper surface, a slider slidably disposed within the groove 12 (the slider and the groove 12 are structurally matched), a support seat 13 mounted on the side of the support base plate 11 and protruding from its upper surface, a limiting block 15 detachably embedded in the support seat 13, and an adjusting screw 14 clamped between the support seat 13 and the limiting block 15 and passing through the slider. The upper clamping mechanism 2 includes a first clamping block 21 fixed to the upper surface of the support base plate 11 and a second clamping block 22 connected to the slider and cooperating with the first clamping block 21. Both the first clamping block 21 and the second clamping block 22 are perpendicular to the groove 12. When the adjusting screw 14 is rotated, the second clamping block 22 moves toward the direction of the first clamping block 21 or moves away from the first clamping block 21 to adjust the distance between it and the first clamping block 21 and clamp the first clamping plate or the second clamping plate 4. The positioning mechanism 3 includes an L-shaped extension plate 31 detachably mounted on the side of the first clamping block 21 via a first fastener 32, and a limiting plate 33 adjustablely mounted on the L-shaped extension plate 31 and disposed opposite to the second clamping block 22 (specifically, the L-shaped extension plate 31 has at least two slots 311 extending along the direction of the first clamping block 21, and the limiting plate 33 is connected to the L-shaped extension plate 31 via multiple second fasteners 34 passing through the slots 311; commercially available fasteners are acceptable). In use, the end face of the second clamping plate 4 is generally placed against the L-shaped extension plate 31 to precisely control the distance between the support pad 41 and the L-shaped extension plate 31, thereby ensuring the precise fit between the support pad 41 and the arc-shaped processing surface. This ensures that the outward-facing surface of the carbon fiber strip clamp 1' is in a horizontal state when it is assembled, further ensuring the processing accuracy with an error of ≤ ±1 mil.

[0042] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for processing a high-precision arc-shaped surface on the surface of a carbon fiber strip, wherein the carbon fiber strip is fixed on a fixing fixture for processing, the fixing fixture includes at least a clamping component, a first clamping plate that cooperates with the clamping component, and at least one second clamping plate (4) that cooperates with the clamping component and is selected from the first clamping plate, wherein a support pad (41) is fixed on the side of the second clamping plate (4), and the upper surface of the support pad (41) is an arc-shaped surface; Its features are, Includes the following steps: (a) Clamp the carbon fiber strip to be processed on the fixing fixture so that either side of the carbon fiber strip is in close contact with the side of the first clamping plate; (b) Fix the fixture on the operating table of the machining center, and make the cutting head of the machining center rough machine the surface of the carbon fiber strip in a direction parallel to the end face of the carbon fiber strip to form a first arc-shaped machining surface on the corresponding surface; the machining allowance of the rough machining is 0.05~0.5mm, and the machining parameters of the rough machining cutting head are: feed rate 0.5~1mm / s, feed amount 0.02-0.03mm; (c) Remove the fixing fixture from the operating table, rotate the carbon fiber strip 180° and clamp it on the fixing fixture so that the other side of the carbon fiber strip is attached to the side of the second clamping plate (4) so ​​that the first arc-shaped processing surface is supported on the support pad (41); repeat step (b) to process and form the second arc-shaped processing surface; (d) Continue to finish the second arc-shaped machining surface. The finishing allowance is 0.01~0.02mm. The machining parameters of the finishing cutter are: feed rate 0.1~0.2mm / s, feed amount 0.02-0.03mm. (e) Remove the fixing fixture from the operating table, rotate the carbon fiber strip 180° and clamp it on the fixing fixture so that one side of the carbon fiber strip is attached to the side of the second clamping plate (4), so that the finished second arc-shaped machining surface is supported on the support pad (41); repeat step (d) to process and form the finished first arc-shaped machining surface. The clamping assembly includes a lower clamping mechanism (1), an upper clamping mechanism (2) adjustablely mounted on the lower clamping mechanism (1), and a positioning mechanism (3) adjustablely mounted on the side of the upper clamping mechanism (2). The second clamping plate (4) is detachably mounted on the upper clamping mechanism (2), and the lower clamping mechanism (1) is detachably mounted on the operating table of the machining center. The lower clamping mechanism (1) includes a support base plate (11), a groove (12) formed in the support base plate (11) and extending through its upper surface, a slider slidably disposed in the groove (12), a support seat (13) mounted on the side of the support base plate (11) and protruding from the upper surface of the support base plate (11), a limiting block (15) detachably embedded in the support seat (13), and an adjusting screw (14) clamped between the support seat (13) and the limiting block (15) and passing through the slider. The upper clamping mechanism (2) includes a first clamping block (21) fixed to the upper surface of the support base plate (11) and a second clamping block (22) connected to the slider and cooperating with the first clamping block (21). The first clamping block (21) and the second clamping block (22) are both perpendicular to the slide groove (12). When the adjusting screw (14) is rotated, the second clamping block (22) moves toward the direction of the first clamping block (21) or moves away from the first clamping block (21) to adjust the distance between it and the first clamping block (21) and clamp the first clamping plate or the second clamping plate (4). The positioning mechanism (3) includes an L-shaped extension plate (31) detachably mounted on the side of the first clamping block (21) by a first fastener (32) and a limiting plate (33) adjustablely mounted on the L-shaped extension plate (31) and disposed opposite to the second clamping block (22).

2. The method for machining a high-precision arc-shaped surface on the surface of a carbon fiber strip according to claim 1, characterized in that, It also includes the following steps: (f) Remove the fixing clamp from the operating table, rotate the carbon fiber strip 90° and clamp it on the fixing clamp so that another side of the carbon fiber strip is in close contact with the side of the first clamping plate. (g) Repeat steps (b)-(e) to process and form the third and fourth arc-shaped machined surfaces after finishing.

3. The method for machining a high-precision arc-shaped surface on the surface of a carbon fiber strip according to claim 1, characterized in that: When there are multiple second clamping plates (4), the support pads (41) on different second clamping plates (4) have the same or different sizes.

4. The method for machining a high-precision arc-shaped surface on the surface of a carbon fiber strip according to claim 1, characterized in that: The L-shaped extension plate (31) has at least two slots (311) extending along the direction of the first clamping block (21), and the limiting plate (33) is connected to the L-shaped extension plate (31) by multiple second fasteners (34) passing through the slots (311).

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