Wind tunnel vehicle model and manufacturing method thereof

[0035] reference figure 1 As shown, figure 1 A flowchart of a manufacturing method of a wind tunnel vehicle model according to an embodiment of the present invention is disclosed. The manufacturing method of the wind tunnel car model includes the following steps:

[0036] 101. Data preparation steps. Determine the external modeling data plane according to the chassis data and the appearance modeling data. The external modeling data plane is used as the reference, and the data planes are respectively offset inward to determine the skeleton installation data plane, the end face part installation data plane and the rough machining data plane. The wind tunnel vehicle model of the present invention is a 1:1 model, the chassis is generally a batch body chassis, and the appearance of the body has original design data. According to the chassis data and appearance modeling data, the exterior modeling data surface of the car body can be determined. On the basis of the external modeling data surface, the external modeling data surface is used as a reference, and the data surface is offset inward by different distances to obtain the data surface of the skeleton installation, the installation data surface of the end face and the rough machining data surface. The skeleton installation data plane is the boundary of the outer contour of the skeleton. The skeleton is usually formed by welding square steel. Therefore, it is necessary to lay other construction materials outside the skeleton to form the body blank. In order to leave enough installation and processing space for the building materials, the outer contour of the skeleton needs to keep a sufficient distance from the outer model data plane. The biggest difference between the present invention and the prior art lies in the treatment of end face parts. In the prior art, the outer contours of the end face parts, such as the front part and the rear part of the vehicle, are consistent with the outer shape data surface, that is, no sludge is laid on the end face parts, and the outer surface of the end face parts is directly used as the outer surface of the body. The resulting defect is that if the end face parts need to be changed in shape, the finished FRP parts cannot be modified, and the end face parts can only be re-made, which results in an elongated process cycle and an increase in process costs. In the present invention, the mounting data plane of the end face part is formed by offsetting the outer model data face inward. The sludge layer outside the end face parts of the present invention is also piled up. When a partial or small-scale modeling change is performed, only the sludge layer outside the end face parts needs to be changed, and the end face parts do not need to be replaced. The stacking, milling and processing technology of the sludge layer is relatively simple, and the process cycle is short, so the process cycle and cost can be effectively reduced. The rough machining data plane is the rough machining reference plane for the construction material to form the body blank. The sludge layer needs to be stacked outside the body blank and the sludge layer is finished. The outer contour of the final sludge layer is the outer contour of the body, so the rough machining The data plane is also offset inward on the basis of the outer model data plane. In one embodiment, the skeleton installation data plane, the end face part installation data plane and the rough machining data plane are respectively determined as follows:

[0037] In the area corresponding to the installation position of the skeleton, the outer modeling data plane is used as the reference, and the inward offset is 50mm~150mm to determine the skeleton installation data plane.

[0038] In the area corresponding to the part installation position, the outer modeling data plane is used as the reference, and the inward offset is 10mm~20mm to determine the part installation data plane.

[0039] The external modeling data plane is the reference, and the inward offset is 15mm~25mm to determine the rough machining data plane.

[0040] 102. Steps for making skeleton. The skeleton is made according to the chassis data and appearance modeling data, and the skeleton is installed on the chassis, and the outer contour of the skeleton does not exceed the skeleton installation data plane. In one embodiment, the frame is formed by welding square steel. For example, the frame is formed by welding square steel with a specification of 40mm*40mm.

[0041] 103. Rough construction steps. Place construction materials on the skeleton for rough construction, where the outer contour of the constructed rough exceeds the external modeling data plane. In one embodiment, the building materials include wooden planks and foam. The wooden planks are laid on the skeleton, and the wooden planks are coated with foam. The outer contour of the foam extends beyond the outer model data surface. The wood board can be ordinary wood board, and the foam can be used with a density of 0.47g/cm 3 Of bubbles. In the process of building the blank, it is necessary to reserve a counterweight hole. A counterweight will be placed in the counterweight hole. In order to leave enough machining allowance for the subsequent processing process, when the blank is built, the outer contour of the blank will exceed the outer modeling data plane.

[0042] 104. The rough machining step of the blank. According to the rough machining data, the rough machining is performed on the constructed blank. In the roughing step of roughing, milling roughing is performed on the roughing of the construction material. The roughing of milling is based on the roughing data plane, and the outer contour of the fur is milled to match the roughing data plane.

[0043] 105. Steps for making end parts. The end face part is made according to the appearance modeling data, and the outer contour of the end face part does not exceed the installation data surface of the end face part. In one embodiment, the end face part is a glass fiber reinforced plastic part. In one embodiment, while making the end face parts, it also includes making detachable parts for the sensitive parts on the vehicle body. The sensitive parts here refer to parts that are sensitive to wind tunnel experiments and often need to be modified in shape, usually including: exterior mirrors, front and rear door handles, grilles, lights, etc. Since these parts often need to be changed in shape, they are set to be detachable. Correspondingly, openings are provided in the areas corresponding to the detachable parts on the blank and sludge (the sludge layer will be piled up in the subsequent body assembly steps). The contour of the opening is reinforced by a reinforcing material, such as polyurethane material, and the detachable part is installed in the opening. With the reinforcement of the polyurethane material, the contour of the opening is relatively firm, which can effectively support the detachable part for wind tunnel experiments. When you need to change the shape of a part, you can remove the part and replace the part after the shape change. At the same time, the polyurethane material in the opening is removed, and the shape of the opening is adjusted according to the shape of the changed part. It is more convenient to adjust the shape of the opening on the blank and sludge layer. After the shape of the opening is adjusted, polyurethane is used again. The material strengthens the opening, and then installs the parts after the shape change. As described above, the main difference between the present invention and the prior art lies in the treatment of end face parts. The outer contour of the end face part of the present invention does not exceed the installation data surface of the end face part. In this way, the surface of the end face part of the present invention is not an external modeling data surface, and a sludge layer will be piled on the outer surface of the end face part. The outer surface of the sludge layer is the external modeling data surface. Therefore, when the modeling needs to be changed later, the modeling change can be completed by restacking and milling the sludge layer, without the need to modify the shape of the end parts. In the prior art, since the outer surface of the end face part is directly the outer modeling data surface, the sludge layer is no longer piled on the end face part. Therefore, when the modeling needs to be changed, the shape of the end face part must be changed directly. The end face parts are usually glass fiber reinforced plastic parts with a thickness of 3mm to 5mm, which cannot be milled, so they can only be replaced by re-molding. This means that the cost of replacing end face parts is high and the construction period is long.

[0044] 106. Car body assembly steps. Install the internal parts of the car body on the chassis or skeleton, assemble the end parts and the rough-processed blanks to form a complete car body, stack sludge on the complete car body, and the outer contour of the piled sludge exceeds the outer model data surface. In the body assembly step, the parts in the body are first installed on the chassis or skeleton, mainly the engine parts in the engine compartment. Then the end face parts and the rough-machined blank are assembled to form a complete car body. In one embodiment, the end face part and the blank are marked with an alignment reference line 204 (reference image 3 As shown in the stacking reference line 204), when the end face part and the blank are assembled, the alignment reference line 204 is aligned with each other, so that the end face part and the blank are positioned. The sludge is piled on the complete car body, and the outer contour of the piled sludge exceeds the outer shape data surface. Since the piled sludge still needs to be milled and finished, it is necessary to leave a machining allowance for the milling finishing. As mentioned above, there are counterweight holes on the blank and sludge, and the counterweight material is placed in the counterweight holes. reference image 3 As shown, a weight material block 205 is inserted into the weight hole. In one embodiment, the weight material block has a density of 0.7g/cm 3 Of polyurethane material blocks.

[0045] 107. In the finishing process of the whole vehicle, the surface of the sludge outside the car body is milled and finished according to the exterior modeling data. The finished sludge contour is consistent with the exterior modeling data surface, and the finishing sludge is polished and painted. During the execution of the finishing steps of the vehicle, after milling and finishing the sludge outside the car body, the detachable parts of the sensitive parts are first installed on the milled finishing sludge. After installing the detachable parts, the sludge is polished and painted.

[0046] 108. Modeling adjustment steps. During the wind tunnel test, the external modeling data surface is adjusted according to the test data. According to the adjusted external modeling data surface, the piled sludge is milled or piled again to meet the adjusted external modeling data surface. Model the data surface. Most of the changes during the wind tunnel experiment are very small, so they can all be implemented by changing the sludge layer, without the need to re-manufacture and replace the road end parts. If the changed part involves the detachable part of the sensitive part, as described above, according to the adjusted external shape data surface, select a new detachable part for replacement, and at the same time, adapt the opening for installing the detachable part. change.

[0047] In the prior art, it takes at least 4 weeks to redesign the end FRP parts and manufacture FRP molds. It takes at least 4 weeks for the FRP parts to be installed on the car body. The installation process also needs to use a measuring machine for assistance. It ranges from thousands to tens of thousands, which cannot meet the time requirements of wind tunnel experiments. However, the modification of the model of the present invention only needs to re-pile the sludge, milling by the machine tool, the modification period is 3 days, the cost is greatly reduced, and the time requirement of the wind tunnel experiment can be met.

[0048] reference figure 2 with image 3 As shown, the present invention also proposes a wind tunnel vehicle model. among them figure 2 A schematic cross-sectional structure diagram of a wind tunnel vehicle model according to an embodiment of the invention is disclosed. image 3 The structural schematic diagram of the end face parts in the wind tunnel vehicle model according to an embodiment of the present invention is disclosed. figure 2 with image 3 The wind tunnel vehicle model shown is the wind tunnel vehicle model manufactured according to the aforementioned manufacturing method of the wind tunnel vehicle model.

[0049] As shown in the figure, the wind tunnel vehicle model includes: chassis 201, skeleton 202, construction materials (not shown in the figure), end parts 203, sludge layer (not shown in the figure) and detachable parts (not shown in the figure) show).

[0050] The chassis 201 generally adopts a bulk body chassis. The skeleton 202 is installed on the chassis 201, and the outer contour of the skeleton 202 does not exceed the skeleton installation data plane 302. In one embodiment, the frame 201 is formed by welding square steel. For example, the frame 201 is formed by welding square steel with a specification of 40mm*40mm. The building materials are placed on the skeleton 201 to form a blank, and the initial outer contour of the blank exceeds the outer modeling data plane 301. The blank is rough processed, and the outer contour of the rough processed blank conforms to the rough processing data plane 304. In one embodiment, the building materials include wood planks and foam. The wood planks are laid on the skeleton, and foam is coated on the planks. The outer contour of the foam extends beyond the outer shape data surface. The wood board can be ordinary wood board, and the foam can be used with a density of 0.47g/cm 3 Of bubbles. in figure 2 In the figure, the blank formed by the building materials is not shown, but the external modeling data surface 301 and the roughing data surface 304 are shown. In one embodiment, the blank and the sludge layer to be subsequently stacked on the surface of the vehicle body have counterweight holes, and the counterweight material is placed in the counterweight holes.

[0051] The end part 203 is installed on the chassis 201 or the frame 202. The end face part 203 is assembled with the rough-processed blank to form a complete car body, and the outer contour of the end face part 203 does not exceed the end face part installation data plane 303. The end part 303 is a glass steel part. The outer contour of the end face part 203 of the present invention does not exceed the end face part installation data surface 303. In this way, the surface of the end face part of the present invention is not an external modeling data surface, and a sludge layer will be piled on the outer surface of the end face part. The outer surface of the sludge layer is the external modeling data surface. Therefore, when the modeling needs to be changed later, the modeling change can be completed by restacking and milling the sludge layer, without the need to modify the shape of the end parts. When assembling the body, first install the internal parts of the body on the chassis or skeleton, mainly the engine parts in the engine compartment. Then the end part 203 is assembled with the rough-processed blank to form a complete car body. In one embodiment, an alignment reference line 204 is drawn at the splicing position of the end part 203 and the blank, referring to image 3 As shown in the stacking reference line 204, when the end face part 203 and the blank are assembled, the alignment reference line 204 is aligned with each other, so that the end face part and the blank are positioned. As mentioned above, there are counterweight holes on the blank and sludge, and the counterweight material is placed in the counterweight holes. reference image 3 As shown, a weight material block 205 is inserted into the weight hole.

[0052] The sludge layer is formed by piling up sludge on the complete car body, and the initial outer contour of the sludge layer exceeds the outer modeling data plane 301. The sludge layer is refined, and the outer contour of the refined sludge layer conforms to the external modeling data plane 301.

[0053] The detachable part is a sensitive part on the car body, and the detachable part is installed on the finished sludge layer. Sensitive parts refer to parts that are sensitive to wind tunnel experiments and often need to be modified in shape. They usually include: exterior mirrors, front and rear door handles, grilles, lights, etc. Since these parts often need to be changed in shape, they are set to be detachable. Correspondingly, openings are provided in the areas corresponding to the detachable parts on the blank and sludge layer. The contour of the opening is reinforced by a reinforcing material, such as polyurethane material, and the detachable part is installed in the opening. With the reinforcement of the polyurethane material, the contour of the opening is relatively firm, which can effectively support the detachable part for wind tunnel experiments. When you need to change the shape of a part, you can remove the part and replace the part after the shape change. At the same time, the polyurethane material in the opening is removed, and the shape of the opening is adjusted according to the shape of the changed part. It is more convenient to adjust the shape of the opening on the blank and sludge layer. After the shape of the opening is adjusted, polyurethane is used again. The material strengthens the opening, and then installs the parts after the shape change.

[0054] According to the requirements of the wind tunnel experiment, the wind tunnel vehicle model also includes internal parts of the vehicle body, which are installed on the chassis 201 or the frame 202.

[0055] Combine figure 2 with image 3 As shown, in the present invention, on the basis of the external modeling data surface 301, the skeleton installation data surface 302, the end face part installation data surface 303 and the rough machining data surface 304 are respectively determined by offsetting inward. The outer model data plane 301 is based on the chassis data and appearance model data, and the outer model data plane 301 is used as a reference, and is respectively offset inward to determine the skeleton installation data plane 302, the end face part installation data plane 303 and the rough machining data plane 304. The wind tunnel vehicle model of the present invention is a 1:1 model, the chassis is generally a batch body chassis, and the appearance of the body has original design data. According to the chassis data and appearance modeling data, the exterior modeling data plane 301 of the vehicle body can be determined. On the basis of the external modeling data plane 301, the external modeling data plane is used as a reference, and the data plane is offset inward by different distances to obtain the skeleton installation data plane 302, the end face part installation data plane 303 and the rough machining data plane 304. The skeleton installation data plane 302 is the boundary of the outer contour of the skeleton 202. The skeleton 202 is usually formed by welding square steel. Therefore, it is necessary to lay other construction materials outside the skeleton to form a body blank. In order to leave enough installation and processing space for the building materials, the outer contour of the skeleton needs to keep a sufficient distance from the outer model data plane. The biggest difference between the present invention and the prior art lies in the treatment of the end face parts 203. In the prior art, the outer contours of the end face parts, such as the front part and the rear part of the vehicle, are consistent with the outer shape data surface, that is, no sludge is laid on the end face parts, and the outer surface of the end face parts is directly used as the outer surface of the body. The resulting defect is that if the end face parts need to be changed in shape, the finished FRP parts cannot be modified, and the end face parts can only be re-made, which results in an elongated process cycle and an increase in process costs. In the present invention, the end-face part installation data plane 303 is formed by offsetting the outer shape data face inward. The end face part 203 of the present invention is also piled up with a sludge layer. When a partial or small-scale modeling change is performed, only the sludge layer outside the end face part needs to be changed, and the end face part does not need to be replaced. The stacking, milling and processing technology of the sludge layer is relatively simple, and the process cycle is short, so the process cycle and cost can be effectively reduced. The rough machining data plane is the rough machining reference plane for the construction material to form the body blank. The sludge layer needs to be stacked outside the body blank and the sludge layer is finished. The outer contour of the final sludge layer is the outer contour of the body, so the rough machining The data plane is also offset inward on the basis of the outer model data plane. In an embodiment, the skeleton installation data plane 302, the end face part installation data plane 303, and the rough machining data plane 304 are respectively determined as follows:

[0056] In the area corresponding to the installation position of the skeleton, the outer modeling data plane is used as a reference, and the skeleton installation data plane 302 is determined by an inward offset of 50 mm to 150 mm.

[0057] In the area corresponding to the part installation position, the outer modeling data plane is used as a reference, and the part installation data plane 303 is determined by an inward offset of 10mm-20mm.

[0058] The outer model data plane is used as a reference, and the rough machining data plane 304 is determined by an inward offset of 15mm-25mm.

[0059] The wind tunnel vehicle model and the manufacturing method thereof of the present invention can complete partial modeling changes on the sludge layer, reducing the need for re-manufacturing FRP parts. The modification process cycle of the wind tunnel vehicle model of the present invention is greatly shortened, the cost is greatly reduced, the rapid and efficient modification of the wind tunnel vehicle model is realized, and the requirements of the wind tunnel experiment can be met.

[0060] The above-mentioned embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above-mentioned embodiments without departing from the inventive idea of ​​the present invention. The protection scope of the present invention is not limited by the above-mentioned embodiments, but should be the maximum scope that meets the innovative features mentioned in the claims.