Method for controlling boundary dimension of multi-layer flexible material

Abstract

The invention discloses a method for controlling the boundary dimension of a multi-layer flexible material. The method comprises the following implementation steps: step 1, preparing a multi-layer flexible material; the flexible material is pre-compressed; 2, selecting and matching the thickness of the material; after each layer of material is laid, the outer diameter of the product is measured, and then the next layer of material with the proper thickness is selected and matched according to the measured value; thirdly, a tool is used for positioning, assembling, pressing and shaping the product; and 4, performing non-contact laser scanning measurement on the shaped product. The laying quality of the flexible material can be improved, and the appearance size of the cured material is ensured to be qualified.

Description

Technical Field

[0001] The present invention relates to a method for controlling the outer dimension of a flexible material with multiple links and full processes, which is used for controlling the outer dimension after laying multiple layers of flexible materials. Background Art

[0002] In the current existing flexible material laying process flow, first, single-layer or multi-layer wet flexible materials are laid and stacked layer by layer to wrap the outer surface of the product; then, tape is used to wrap and tighten to compress the flexible material and limit the outer dimension; then, the flexible material is dried and cured in an oven, and the tape is removed; finally, a template tooling is used to detect the outer dimension of the feature structure.

[0003] First of all, after a single flexible material is prepared, it is in a wet flexible state and has a certain compression amount in the thickness direction. Due to the current preparation equipment and process limitations, problems such as over-thick thickness dimension and uneven thickness often occur. After single flexible materials are laid and stacked and bonded layer by layer, if the thickness dimension of a single material is out of tolerance and the errors accumulate, it will directly lead to the out-of-tolerance of the final outer dimension.

[0004] Secondly, the outer dimension during the laying process of the flexible material is not monitored, and the manufacturing errors of the flexible material thickness accumulate layer by layer, and it is easy to find the problem of out-of-tolerance of the outer dimension only after all the materials are laid.

[0005] Thirdly, when using tape to tighten and shape, the pressing force given by the tape to the flexible material is limited, the compression amount of the material is insufficient, and the outer dimension is easy to be out of tolerance; at the same time, there are imprints of tape tightening and uneven deformation on the outer surface of the material, which affects the surface quality.

[0006] Finally, the template tooling can only detect local features, the detection range coverage is small, and the accuracy is poor; in order to ensure the correct relative position between the template tooling and the product, it is necessary to use the feature structure on the product as a reference and connect, resulting in a complex structure of the template tooling, a long assembly time, and a high labor cost. Summary of the Invention

[0007] In view of this, the present invention provides a method for controlling the outer dimension of multi-layer flexible materials, which can improve the laying quality of flexible materials and ensure the qualified outer dimension of the materials after curing.

[0008] The method for controlling the outer dimension of multi-layer flexible materials is implemented as follows:

[0009] Step 1: Pre-compress the flexible material;

[0010] Step 2: Select the material thickness; after each layer of material is laid, measure the outer diameter dimension of the product, and then select the next layer of material with a suitable thickness according to the measured value;

[0011] Step 3: Use the tooling to position and assemble the product and compress and shape it;

[0012] Step 4: Perform non-contact laser scanning measurement on the shaped product.

[0013] Further, the pre-compression process of the Step 1 includes: Before laying the flexible material, put a certain number of materials into a self-sealing bag, use a vacuum extraction device to remove the air and moisture in the bag, make the self-sealing bag shrink, and then compress the flexible material. During this period, measure the thickness of the self-sealing bag until it meets the preset value, then keep it for several hours and then open the bag for use, so as to achieve the effect of material pre-compression.

[0014] Further, the process of the Step 3 includes: Before laying the flexible material, place the product to be wrapped in a vertical posture on the base tooling, and perform positioning and assembly with the base tooling based on the features such as the end face and inner shape of the product to ensure the correct position and pose of the product; after laying the flexible material, use the clamping ring tooling to compress and shape it. At the same time, there is a limiting structure between the clamping ring tooling and the base tooling to ensure the correct relative position between the clamping ring tooling and the product, and then ensure the correct outer shape dimension of the flexible material after curing. Then remove the base tooling to expose the end face of the product, which is beneficial to the discharge of water vapor during drying. Finally, the clamping ring tooling enters the oven with the product to complete the drying and curing of the flexible material.

[0015] Further, the tooling includes a clamping ring assembly, a base mandrel, a base, and a limiting block;

[0016] The inner shape surface of the clamping ring assembly is closely fitted with the flexible material in a conforming manner, and is used for centripetal compression and outer shape control of the flexible material;

[0017] The base mandrel is composed of two cylindrical sections with different diameters, and there is a right-angle surface transition between the cylindrical sections. The outer circumferential surface of the small-diameter cylindrical section has a small clearance fit with the inner shape surface of the product and is used for radial positioning of the product. The transition right-angle surface is in contact with the end face of the product and is used for axial positioning of the product;

[0018] The base is used to connect the clamping ring assembly and install the limiting block;

[0019] The limiting block is in a cuboid structure, and one end is a round head, which is used for angular positioning between the base and the clamping ring assembly.

[0020] Further, the clamping ring assembly includes three-piece clamping rings, three pads, bolts, and nuts. On both sides of the inner shape surface of each piece of clamping ring, an avoidance groove with the same length as the clamping ring is opened along the axis. The pads are riveted in the avoidance grooves, and the pads have the same length as the clamping ring. The inner shape diameter of the pads is the same as that of the clamping ring. After the three-piece clamping rings are closed, the pads are connected end to end with the avoidance grooves on the adjacent clamping rings to form an inner and outer nesting. The three-piece clamping rings are butt-jointed through flanges and locked by bolts and nuts.

[0021] Further, the middle hole on the base is the mounting hole for the base mandrel. Six threaded holes are evenly distributed on the outer circle of the base for connecting the clamping ring assembly. At the same time, a limiting groove is provided on the outer circle, and angular positioning of the clamping ring assembly is achieved after installing the limiting block.

[0022] Beneficial effects:

[0023] 1. Through multiple links and measures such as pre-compression of flexible materials, selection of material thickness, shaping by tooling pressing, and non-contact laser scanning measurement, the present invention effectively controls the external dimensions of multi-layer flexible materials after curing.

[0024] 2. In step 1 of the present invention, a certain number of layers of flexible materials are evacuated to pre-compress the materials and remove excessive moisture in the materials, ensuring the thickness of single-layer materials and controlling the water content in the materials, laying a foundation for ensuring the final external dimensions.

[0025] 3. The present invention monitors the dimensions of flexible materials during the process. If any out-of-tolerance is found, rework is immediately carried out, and materials with corresponding thicknesses are selected according to the measured dimensions to ensure the qualification of the process.

[0026] 4. From raw materials - laying process - post-process inspection and other multiple links in the whole process, the present invention takes targeted measures, and each link is closely linked to achieve the purpose of controlling the external dimensions of multi-layer flexible materials after laying.

[0027] 5. The tooling of the present invention is composed of a clamping ring assembly, a base mandrel, a base, and a limiting block, highly integrating functions such as product positioning and assembly, material pressing, external dimension control, and water and gas release. It not only effectively controls the compression amount and external dimensions of flexible materials, improves the surface quality and consistency of external dimensions of flexible materials, but also solves the problems of manual tape wrapping, uncontrollable pressing force and material compression amount, and poor surface quality of materials after the tape is tightened. Description of the drawings

[0028] Figure 1 is the step flow chart of the method for controlling the external dimensions of multi-layer flexible materials;

[0029] Figure 2 is the side view (before compression of flexible materials) of the device for controlling the external dimensions of flexible materials of the present invention;

[0030] Figure 3 is Figure 2 the top view of;

[0031] Figure 4 is Figure 3 the B-B sectional view of;

[0032] Figure 5 is the assembly structure schematic diagram of the clamping ring assembly;

[0033] Figure 6Side view of the clamping ring;

[0034] Figure 7 Top view of the clamping ring;

[0035] Figure 8 Top view during the assembly of the backing plate;

[0036] Figure 9 Side view during the assembly of the backing plate;

[0037] Figure 10 Schematic diagram of the assembly structure of the backing plate and the relief groove after mold clamping;

[0038] Figure 11 Schematic diagram of the structure of the base mandrel;

[0039] Figure 12 Schematic diagram of the structure of the base;

[0040] Figure 13 Schematic diagram of the structure of the limit block.

[0041] Wherein, 1 - clamping ring assembly, 2 - base mandrel, 3 - base, 4 - positioning block, 5 - bolt, 6 - nut, 7 - disassembly bolt, 8 - flexible material, 9 - backing plate, 10 - connecting bolt Specific implementation manner

[0042] The following combines the accompanying drawings and gives examples to describe the present invention in detail.

[0043] The present invention provides a method for controlling the external dimensions of a multi-layer flexible material. As shown in the attached Figure 1 figure, the steps implemented by this method are as follows:

[0044] Step 1. Pre-compression of the flexible material: Before laying the flexible material, a certain number of materials are loaded into a self-sealing bag, and a vacuum pumping device is used to pump out the air and moisture in the bag, causing the self-sealing bag to shrink, thereby compressing the flexible material. During this period, the thickness of the self-sealing bag is measured until it meets the preset value, and then it is kept for several hours before opening the bag for use, so as to achieve the effect of pre-compressing the material.

[0045] Step 2. Selection of material thickness: After each layer of material is laid, the outer diameter dimension of the product is measured, and then according to the measured value, the next layer of material with a suitable thickness is selected.

[0046] Step 3: Product positioning and assembly and tooling compression and shaping: Before laying the flexible material, place the wrapped product in a vertical position on the base tooling, and use the product end face and inner surface features as a reference for positioning and assembly with the base tooling to ensure the correct product posture. After laying the flexible material, use the ring tooling to compress and shape it. At the same time, there is a limiting structure between the ring tooling and the base tooling to ensure the correct relative position of the ring tooling and the product, thereby ensuring the correct external surface size of the flexible material after curing. Then remove the base tooling to expose the end face of the product, which is conducive to the discharge of water vapor during drying. Finally, the ring tooling is put into the oven together with the product to complete the drying and curing of the flexible material.

[0047] Step 4: Non-contact laser scanning measurement: After the flexible material is solidified, use a laser scanner to perform non-contact laser scanning of the product's full-size dimensions to determine the eligibility of the dimensions.

[0048] As attached Figure 2 , 3 As shown in , 4 , the tooling of the present invention includes a ring assembly 1, a base core shaft 2, a base 3, a positioning block 4, a bolt 5, a nut 6, a disassembly bolt 7 and a connecting bolt 10.

[0049] The inner surface of the ring assembly 1 is closely fitted with the flexible material, and is used for centripetal compression and shape control of the flexible material. It is composed of three petal rings. The assembly structure is shown in FIG. Figure 5 , each petal ring structure see Figure 6 and 7 On both sides of the inner surface of each petal of the ring, an escape groove with the same length as the ring is opened along the axis. The pad 9 is riveted in the escape groove. The pad 9 is the same length as the ring, and the inner surface diameter of the pad 9 is consistent with the ring. Figure 8 and 9 As shown, after the three-petal ring is molded, the pad 9 is connected to the avoidance groove on the adjacent ring end to end to form an inner and outer nesting, and the three-petal ring is butted by flanges and locked by bolts 5 and nuts 6. Figure 10 As shown in the figure, the structure is to prevent the flexible material at the flange from being squeezed and deformed when the holding ring shrinks, thereby affecting the surface quality.

[0050] The holding ring assembly 1 is connected to the base 3 through the flange at the lower edge. The flange at the lower edge is provided with threaded holes and through holes for assembling and disassembling bolts 7 and connecting bolts 10.

[0051] There are two through holes on the upper side of the holding ring assembly 1 for positioning and assembling with the product to ensure that the relative position of the holding ring in the axial direction of the product is correct.

[0052] A number of centripetal water vapor channels are arranged on the wall surface of the ring assembly 1, which are evenly distributed small-diameter through holes for releasing water vapor in the flexible material.

[0053] As attachedFigure 11 As shown, the base mandrel 2 is used for the assembly positioning of the product. The base mandrel 2 is provided with two positioning surfaces. Among them, the positioning surface 1 is in small clearance fit with the inner shape surface of the product for the radial positioning of the product, and the positioning surface 2 is in contact with the end face of the product for the axial positioning of the product. There is a large-diameter through hole in the middle for weight reduction.

[0054] As shown in the appendix Figure 12 As shown, the middle hole on the base 3 is the installation hole for the base mandrel 1. There are 6 M10 threaded holes evenly distributed on the outer circle for the connection of the clamping ring assembly 1. At the same time, there is a limit groove on the outer circle. After the limit block 4 is installed, the angular positioning of the clamping ring assembly 1 is realized.

[0055] As shown in the appendix Figure 13 As shown, the limit block 4 is of a cuboid structure, with a round head at one end for the angular positioning between the base 3 and the clamping ring assembly 1.

[0056] The bolt 5 is an M10*120 bolt, and the nut 6 is an M10 nut for the self-connection of the clamping ring assembly 1. The disassembly bolt 7 and the connecting bolt 10 are M10*40 bolts. Among them, 6 connecting bolts 10 are installed in the through holes of the clamping ring assembly 1 for the connection between the clamping ring assembly and the base 3, and the other 6 disassembly bolts 7 are installed in the threaded holes of the clamping ring assembly 1 for the ejection and removal of the base 3

[0057] During the use process: Before laying the flexible material, the product to be laid is vertically assembled on the base mandrel 2, and positioned by the two positioning surfaces on the base mandrel 2.

[0058] After the flexible material is laid, first install the limit block 4 in the limit groove of the base 3, with the round head direction of the limit block 4 facing inwards. Then assemble the clamping ring assembly 1, bolt 5, and nut 6. During assembly, the 2 through holes on the clamping ring assembly 1 need to be assembled on the positioning shaft of the product to be laid to ensure the correct axial position of the clamping ring assembly relative to the product. In three quadrants, tighten the bolt 5 and nut 6 synchronously to make the clamping ring assembly 1 evenly contract inward until the flanges are completely in contact with each other to achieve the purpose of compressing the flexible material.

[0059] Then install the connecting bolt 10 and connect it with the base 3 and tighten it to make the lower surface of the clamping ring assembly 1 completely in contact with the base 3. Finally, continuously screw in the remaining 6 disassembly bolts 7 to eject and remove the base 3 and the base mandrel 2 together.

[0060] In summary, the above is only the preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Method for controlling the external dimensions of a multi-layer flexible material, characterized in that, The steps implemented by this method are as follows: Step 1: Pre-compress the flexible material; Step 2: Select the material thickness; after each layer of material is laid, measure the outer diameter of the product, and then select the next layer of material with an appropriate thickness according to the measured value; Step 3: Use the tooling to position, assemble and compress the product into a fixed shape; Step 4: Perform non-contact laser scanning measurement on the product after shaping.

2. The method for controlling the external dimension of the multi-layer flexible material according to claim 1, characterized in that, The pre-compression process of Step 1 includes: before laying the flexible material, put a certain number of materials into a self-sealing bag, use a vacuum extraction device to remove the air and moisture in the bag, so that the self-sealing bag shrinks, thereby compressing the flexible material. During this period, measure the thickness of the self-sealing bag until it meets the preset value, and then keep it for several hours before opening the bag for use, so as to achieve the effect of pre-compressing the material.

3. The method for controlling the external dimension of the multi-layer flexible material as described in claim 1, wherein, The process of Step 3 includes: before laying the flexible material, place the product to be wrapped in a vertical posture on the base tooling, and perform positioning and assembly with the base tooling based on features such as the end face and inner shape of the product to ensure the correct position and posture of the product; after laying the flexible material, use the clamping ring tooling to compress and shape it. At the same time, there is a limiting structure between the clamping ring tooling and the base tooling to ensure the correct relative position between the clamping ring tooling and the product, and then ensure the correct outer shape dimension of the flexible material after curing. Then remove the base tooling to expose the end face of the product, which is beneficial to the discharge of water vapor during drying. Finally, the clamping ring tooling enters the oven with the product to complete the drying and curing of the flexible material.

4. The method for controlling the external dimensions of the multi-layer flexible material according to claim 1, characterized in that, The tooling of Step 3 includes a clamping ring assembly, a base mandrel, a base and a limiting block; The inner shape of the clamping ring assembly is closely fitted with the flexible material in a conforming manner, and is used for centripetal compression and outer shape control of the flexible material; The base mandrel consists of two cylindrical sections with different diameters, and there is a right-angle surface transition between the cylindrical sections. The outer circumferential surface of the small-diameter cylindrical section has a small clearance fit with the inner shape of the product and is used for radial positioning of the product. The transition right-angle surface is in contact with the end face of the product and is used for axial positioning of the product; The base is used to connect the clamping ring assembly and install the limiting block; The limiting block is a cuboid structure, and one end is a round head, which is used for angular positioning between the base and the clamping ring assembly.

5. The method for controlling the external dimensions of the multi-layer flexible material according to claim 4, wherein The clamping ring assembly includes three split clamping rings, three pads, bolts and nuts. On both sides of the inner shape of each split clamping ring, an avoidance groove with the same length as the clamping ring is opened along the axis. The pads are riveted in the avoidance groove, and the pads are the same length as the clamping ring. The inner diameter of the pad is the same as that of the clamping ring. After the three split clamping rings are closed, the pads are connected end to end with the avoidance grooves on the adjacent clamping rings to form an inner and outer nesting. The three split clamping rings are butt-jointed through flanges and locked by bolts and nuts.

6. The method for controlling the external dimensions of the multi-layer flexible material according to claim 4 or 5, characterized in that, The middle hole on the base is the installation hole for the base mandrel. Six threaded holes are evenly distributed on the outer circle of the base for connecting the clamping ring assembly; at the same time, a limiting groove is provided on the outer circle to realize the angular positioning of the clamping ring assembly after the limiting block is installed.

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