A reverse packaging molding process and mold for automobile parts

Abstract

The present application discloses a reverse-wrapping molding process and mold for automobile parts. The reverse-wrapping molding process includes the following steps: placing stacked fabrics and plates in a mold cavity; positioning the ends of the fabrics and plates to be wrapped at the top and bottom of a slide in the mold, respectively; closing the mold, and cooperating the fixed mold with the slide to cut the fabric, while the movable mold with the slide to cut the plates, thereby obtaining fabrics and plates of different lengths; folding and wrapping the edges of the cut fabrics, plates, and products; and the mold is used to realize the reverse-wrapping molding process for the above-mentioned automobile parts. The present application has the following beneficial effects: when closing the mold, the fixed mold with the slide to cut the fabric, while the movable mold with the slide to cut the plates, and the cutting positions of the two are different, thereby obtaining fabrics and plates of different lengths, without the need for subsequent step-by-step cutting of the fabrics and plates, thereby greatly improving production efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts production, and in particular to a reverse packaging molding process and a mold for automobile parts. Background Art

[0002] like Figure 1 The figure shows a schematic diagram of the structure of an automobile component. In order to improve the comfort and high-end texture of the interior of the car, the exterior of the automobile component is generally covered with fabric. Of course, a fiberglass board (i.e., fiberglass board) is also covered between the fabric and the product. Here, the reverse molding process is required: the fabric is "reversed" (also called "wrapping" or "curling"), so that its edges are curled inward and fixed to the back or inside of the component (such as Figure 2 Its core advantage is that it hides the raw edges of the fabric and the fixed seams.

[0003] In the reverse packaging molding process, a cutting process is required. It should be known that if Figure 2 As shown, the outermost layer of fabric must be longer than the fiberglass board. However, the existing cutting process requires cutting one layer in-mold before performing a subsequent wrapping step. This means that the existing molding process requires cutting the two layers in separate steps, which reduces production efficiency. Therefore, a reverse wrapping molding process and mold for automotive parts are proposed to address this technical issue. Summary of the Invention

[0004] One of the purposes of this application is to provide a reverse packaging molding process for automotive parts.

[0005] Another object of the present application is to provide a mold.

[0006] To achieve the above objectives, the technical solution adopted in this application is: a reverse packaging molding process for automotive parts, comprising the following steps: S100: placing the stacked fabrics and plates in the mold cavity; S200: positioning the ends of the fabrics and plates to be covered at the top and bottom of the slide in the mold respectively; S300: closing the mold, the fixed mold and the slide cooperate to cut the fabric, and the movable mold and the slide cooperate to cut the plate, thereby obtaining fabrics and plates of different lengths and sizes; S400: folding and covering the edges of the cut fabrics, plates and products.

[0007] Preferably, in step S100, the fabric is a single-layer structure, and the plate is a single-layer structure or a multi-layer structure.

[0008] Preferably, the mold closing process in step S300 further includes the following steps: the fabric, plate and product from top to bottom are formed into an integrated structure under the molding and curing action of the mold.

[0009] Preferably, the cutting process in step S300 further includes the following steps: the sliding knife cuts the plate from top to bottom, and the sliding knife cuts the fabric from bottom to top.

[0010] A mold for realizing the above-mentioned reverse packaging molding process of automobile parts, comprising a fixed mold, a movable mold and a sliding knife. The sliding knife is elastically and vertically slidably installed at the bottom end of the fixed mold and is in a horizontal state. When the fixed mold and the movable mold are closed, the fixed mold cooperates with the sharp blade at the top of the sliding knife to cut the fabric, and the movable mold cooperates with the shearing blade at the end of the sliding knife to cut the plate.

[0011] Preferably, a tool holder is vertically slidably mounted on the bottom end of the fixed mold, and the tool holder is connected to the fixed mold by an elastic member, and the slide is horizontally slidably mounted on the tool holder; the mold also includes a driving device, and the output end of the driving device is connected to the slide; before the fabric is placed in the cavity of the mold, the driving device is suitable for driving the slide to move horizontally and away from the cavity; after the fabric is placed in the cavity, the driving device is suitable for driving the slide to move and reset, thereby separating the fabric and the plate.

[0012] Preferably, the driving device includes a return spring, a first cylinder and an air source, the slide is connected to the tool holder through a return spring, the first cylinder is horizontally installed on the tool holder and one end of the piston rod is connected to the slide, and the air source is arranged in the fixed mold and connected to the first cylinder; when the slide contracts, the air source is suitable for pumping air into the first cylinder to drive the slide to move; when the slide is reset, the air source and the first cylinder are further connected to the outside world, and the slide is suitable for moving and resetting under the drive of the return spring.

[0013] Preferably, the air source includes a second cylinder and a solenoid valve, the second cylinder is installed on the fixed mold and the output end is connected to the tool holder, the solenoid valve is arranged outside the cylinder body of the second cylinder, the first cylinder is communicated with the second cylinder, and the elastic force of the elastic member is greater than the elastic force of the reset spring; when opening the mold, the tool holder is suitable for moving downward and resetting under the action of the elastic member, thereby making the second cylinder extend and evacuating air from the first cylinder to achieve the reset of the sliding knife; after the fabric is placed in the cavity, the solenoid valve is suitable for opening so that the second cylinder and the first cylinder are connected to the outside world.

[0014] Preferably, a positioning block is provided in the movable mold, and a positioning groove is provided at the bottom end of the slide; or a positioning groove is provided in the movable mold, and a positioning block is provided at the bottom end of the slide; when the mold is closed, the positioning block cooperates with the positioning groove to achieve limit locking of the slide.

[0015] Preferably, the elastic member is a nitrogen spring, and guide columns are vertically provided at the four corners of the tool holder, and the guide columns are fixedly installed on the fixed mold and slidingly cooperate with the tool holder; limiting bolts are provided on both sides of the top of the tool holder, and the limiting bolts are installed on the fixed mold and are suitable for limiting the tool holder; an upper waste area for collecting cut fabrics is left between the top of the slide and the fixed mold; a lower waste area for collecting cut plates is left between the bottom of the slide and the movable mold.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention provides a sliding knife in the mold, and the end positions of the fabric to be cut and the plate to be covered are respectively located at the top and bottom of the sliding knife. When the mold is closed, the fixed mold cooperates with the sliding knife to cut the fabric, and the movable mold cooperates with the sliding knife to cut the plate, and the cutting positions of the two are different, so that fabrics and plates of different lengths can be obtained, and there is no need to perform subsequent step-by-step cutting processes of the fabrics and plates, which greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the layer distribution of the existing product.

[0019] Figure 2 This is a schematic diagram of the reverse packaging structure at the edge of the existing product.

[0020] Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the sliding knife retracting state when the fabric and plate are placed into the mold cavity.

[0022] Figure 5 This is a schematic diagram of the sliding knife extending out when the fabric and plate are placed into the mold cavity.

[0023] Figure 6 It is a schematic diagram of the mold closing state of the present invention.

[0024] Figure 7 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0025] Figure 8 It is a schematic diagram of the specific structure of the sliding knife of the present invention.

[0026] Figure 9 Schematic diagram of the structure of the first embodiment of the driving device of the present invention.

[0027] Figure 10 Schematic diagram of the structure of the second embodiment of the driving device of the present invention.

[0028] Figure 11 This is a schematic diagram of the initial contraction state of the slide blade of the present invention.

[0029] Figure 12 It is a schematic diagram of the principle of the sliding knife of the present invention when it is extended.

[0030] Figure 13 This is a schematic diagram of the principle of upward movement of the tool holder during mold closing according to the present invention.

[0031] In the figure: 1. Product; 2. Plate; 3. Fabric; 4. Mold; 401. Fixed mold; 402. Moving mold; 5. Ejector mechanism; 6. Slide; 601. Sharp blade; 602. Shear blade; 7. Driving device; 8. Tool holder; 9. Guide column; 10. Limit bolt; 11. Nitrogen spring; 12. Return spring; 13. First cylinder; 1301. First cylinder body; 1302. First piston rod; 14. Second cylinder; 1401. Second cylinder body; 1402. Second piston rod; 1403. Solenoid valve; 15. Air pipe; 16. Positioning groove; 17. Positioning block. DETAILED DESCRIPTION

[0032] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0033] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating the orientation and position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0034] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0035] Further analysis reveals shortcomings in the existing reverse-wrapping process during the cutting of the outer covering material. During the cutting process, if the fabric 3 and the sheet material 2 are stacked together and placed in the cavity of the cutting die 4, the cutter will cut them to the same length, which clearly does not meet the requirements of the subsequent outer covering molding of product 1 (i.e., automotive parts). Therefore, it is necessary to cut the two fabrics 3 separately, or to cut the sheet material 2 and fabric 3 to the same length and then trim them to meet the actual outer covering requirements of product 1. However, this step-by-step cutting method undoubtedly increases the production process and reduces production efficiency. It should be noted that fabric 3 can be made of genuine leather, synthetic leather, textile fabric, or other flexible materials; sheet material 2 is preferably made of fiberglass, which can effectively support and protect the internal structure of product 1.

[0036] Therefore, the inventors of this application have developed a reverse packaging molding process for automobile parts, which is mainly aimed at the cutting process in the reverse packaging process. Figures 1 to 13 As shown, the following steps are included:

[0037] S100: Place the stacked fabric 3 and plate 2 in the mold cavity of the mold 4; S200: Position the end of the fabric 3 to be covered at the top of the slide 6 in the mold 4, and position the end of the plate 2 to be covered at the bottom of the slide 6 in the mold 4. For the positions that do not need to be covered, there is no need to cut them to different lengths, and they can be adapted to the blades in the mold 4. S300: The mold 4 is closed to cut the two materials, such as Figure 7 As shown, the fixed die 401 cooperates with the sliding blade 6 to cut the fabric 3, while the movable die 402 cooperates with the sliding blade 6 to cut the plate 2. The two cutting positions are different, thereby obtaining fabrics 3 and plates 2 of different lengths. S400: The cut fabric 3, plate 2, and product 1 are then folded and wrapped at the edges.

[0038] Thus, through the above-described cutting process, only one molding process is required to simultaneously complete the cutting process of two materials, thereby improving production efficiency. At the same time, because the cutting process is completed synchronously with the mold 4 during the mold closing process, the accuracy and consistency of the cut fabric 3 and sheet material 2 can be guaranteed, thereby improving the quality of the product 1.

[0039] Of course, during the actual cutting process, the material that needs to be wrapped may have multiple layers. We can categorize these into two types based on length. The first type, the outermost layer (layer 3 of fabric), is the longest. Because it serves as the cuff wrap, it needs to extend to the edge of the component and be fixed. Therefore, layer 3 of fabric is a single-layer structure. The second type, the second layer of sheet material, located between fabric 3 and product 1 (i.e., the automotive component), is slightly shorter and only needs to adhere to the outer surface of the component. Therefore, layer 2 of sheet material can be a single-layer or multi-layer structure.

[0040] It is worth mentioning that since the fabric 3 is located at the top position of the slide 6 and the plate 2 is located at the bottom position of the slide 6, during the mold closing and cutting process, the slide 6 will cut the plate 2 from top to bottom, and the slide 6 will cut the fabric 3 from bottom to top. That is to say, the cutting processes of the two are independent of each other. During the entire cutting process, the slides 6 will not interfere with each other at their respective cutting positions, thereby ensuring the quality of cutting.

[0041] It should be known that when a person skilled in the art makes a general design, two blades with different positions and depths are set at the top of the slide 6. Then, the fabric 3 and the plate 2 are stacked at the top position of the slide 6. When the mold is closed, different blades are used to cut different materials, and the cutting method is from bottom to top (of course, the reverse is from top to bottom), that is, the cutting method of the two is the same. For example, the first blade only cuts the plate 2 at the bottom, and the second blade cuts the plate 2 and the fabric 3 simultaneously, thereby cutting out two specifications of different lengths. However, since the fabric 3 and the plate 2 are flexible materials and have certain compression properties, how to ensure that the first blade only cuts the boundary between the plate 2 and the fabric 3 and does not affect the fabric 3 is very difficult to control and achieve. Therefore, the present application uses a slide 6 and adopts different cutting methods to achieve synchronous cutting of two materials, which not only avoids the above problems, but also improves the accuracy and efficiency of cutting.

[0042] Furthermore, in the mold closing process of step S300, the following steps may also be included: the product 1 to be coated is placed below the plate 2 and in the mold cavity of the mold 4, and then adhesives (such as epoxy resin and curing agent) may be filled between the layers, and a certain pressure and temperature are applied to the mold 4 to complete the molding and curing of the fabric 3, the plate 2 and the product 1 to form an integrated structure, that is, the three are subjected to a three-in-one process while also completing the material cutting process. In this way, in the subsequent process of opening the mold of the product 1, only the outermost layer of the fabric 3 needs to be coated with colloid, and then the reverse coating molding can be quickly performed.

[0043] In addition, Figure 3 As shown, an ejector mechanism 5 can also be provided in the movable mold 402. That is, after the mold is opened, the molded and sheared automobile parts can be ejected through the ejector mechanism 5 for subsequent removal. The ejector mechanism 5 is a conventional structure in the mold 4, so its principle structure is not repeated here.

[0044] Another aspect of the present application provides a mold 4 for realizing the above-mentioned reverse packaging molding process of automobile parts. The mold 4 includes a fixed mold 401, a movable mold 402 and a slide 6. The slide 6 is elastically and vertically slidably installed at the bottom end of the fixed mold 401 and is in a horizontal state.

[0045] It is understandable that if Figure 5 As shown, the fabric 3 and the plate 2 are placed in the mold cavity 4, and the fabric 3 is located at the top end of the slide 6, and the plate 2 is located at the bottom end of the slide 6. Then the mold is closed, as shown in FIG. Figure 6 and Figure 7 As shown, since the slide 6 is elastically mounted, it can float in the vertical direction, that is, the slide 6 will not interfere with the closing of the mold 4. After the mold is closed, the plate 2 will be pressed against the movable mold 402, and the fabric 3 will be pressed against the fixed mold 401, and the plate 2 and fabric 3 will also be pressed against each other. When the movable mold 402 moves upward and approaches the fixed mold 401, it is equivalent to the shearing edge 602 at the (left) end of the slide 6 cutting the plate 2 from top to bottom; when the slide 6 and the movable mold 402 are pressed against each other, the slide 6 will continue to move upward with the movable mold 402, and the sharp blade 601 at the top of the slide 6 will cut the fabric 3 from bottom to top, thus completing the cutting process of the fabric 3 and the plate 2 during the closing of the mold.

[0046] Of course, the specific time of cutting can be set according to the position of the sharp blade 601 and the shearing blade 602 at the sliding knife 6. Figure 7 As shown, since the slide knife 6 is located between the fabric 3 and the plate 2 before cutting, Figure 8 As shown, the thickness of the shearing edge 602 can be set to be very thin, and of course the depth of the sharp edge 601 can be set to be very shallow, so that when the movable mold 402 and the fixed mold 401 are about to be closed, the sliding knife 6 can perform a synchronous cutting process on the two. The main advantage of this is that: at this time, the fabric 3 and the plate 2 are basically in a state of being limited by the mold, and no deviation will occur during cutting, thereby improving the stability and accuracy of cutting.

[0047] We know that since the fabric 3 is made of flexible material, the sliding knife 6 will have a certain impact on it when it is initially laid flat. Figure 9 and Figure 10As shown, a tool holder 8 is vertically slidably installed at the bottom end of the fixed mold 401, and the tool holder 8 and the fixed mold 401 are connected by an elastic member (such as a nitrogen spring 11), and the slide 6 is horizontally slidably installed on the tool holder 8; the mold 4 also includes a driving device 7, and the output end of the driving device 7 is connected to the slide 6.

[0048] It is understandable that before the fabric 3 is placed in the cavity of the mold 4, the driving device 7 can drive the slide 6 to move horizontally and away from the cavity, that is, the contraction process of the slide 6 (such as Figure 4 After the fabric 3 is placed in the cavity, the driving device 7 can drive the slide 6 to move and reset, that is, the extension process of the slide 6 (as shown). Figure 5 As shown), the fabric 3 and the plate 2 are separated at their end positions.

[0049] The present application does not specifically limit the structure of the driving device 7. A specific embodiment is provided below for reference:

[0050] Structure 1: Figure 9 As shown, the specific structure and working principle of the drive device 7 are well known to those skilled in the art and will not be elaborated on in detail here. Common drive devices 7 include hydraulic cylinders, pneumatic cylinders, and linear motors, and those skilled in the art can choose one based on actual needs. In other words, the movement of the slide 6 is completely controlled by the extension and retraction of the drive device 7.

[0051] Structure 2: The driving device 7 includes a return spring 12, a first cylinder 13 and an air source. The slide 6 is connected to the tool holder 8 through the return spring 12. The first cylinder 13 is horizontally installed on the tool holder 8 and one end of the piston rod is connected to the slide 6. The air source is set in the fixed mold 401 and is connected to the first cylinder 13.

[0052] Specifically, such as Figure 11 As shown, the first air cylinder 13 includes a first cylinder body 1301 and a first piston rod 1302, which is sealed and slidably disposed within the first cylinder body 1301. When the slide 6 is to be retracted, the air source can be drawn into the first cylinder body 1301, thereby driving the slide 6 to retract and move via the first piston rod 1302. At this time, the return spring 12 is in a compressed and energy-accumulating state. When the slide 6 needs to be reset, the air source and the first cylinder body 1301 are connected to the outside world, and the slide 6 is then moved and reset under the action of the return spring 12.

[0053] It should be noted that the cooperation among the first cylinder 13, the air source and the reset spring 12 at this time is similar to the principle of the single-acting cylinder in structure one, that is, the shortening action in the first cylinder 13 is achieved by the pumping action, while the extension and reset are achieved by relying on the elastic force of the reset spring 12.

[0054] As a further description of the above embodiment: Figure 11 As shown, the air source includes a second air cylinder 14 and a solenoid valve 1403. Specifically, the second air cylinder 14 includes a second cylinder body 1401 and a second piston rod 1402, which is sealed and slidably disposed within the second air cylinder 1401. The second air cylinder 1401 is vertically fixed to the fixed mold 401, and the second piston rod 1402 is mounted on the tool holder 8. The solenoid valve 1403 is disposed outside the second air cylinder 1401, thereby connecting and disconnecting the second air cylinder 1401 from the outside world. The first air cylinder 1301 and the second air cylinder 1401 are connected via an air pipe 15, and the elastic force of the elastic member is greater than the elastic force of the return spring 12.

[0055] In order to facilitate the understanding of its action process, the following is a detailed description of its working principle: ① Figure 11 As shown, it is assumed that this is the initial state: the slide 6 is in a retracted state, the tool holder 8 is also away from the fixed mold 401, the nitrogen spring 11 is not compressed, and the return spring 12 is in a compressed state. Figure 12 As shown, to extend the slide 6, it is only necessary to open the solenoid valve 1403, thereby connecting the second cylinder 1401 to the outside world. Since the first cylinder 1301 and the second cylinder 1401 are connected, the first piston rod 1302 loses the air pressure force and is then extended under the action of the return spring 12. ③ During mold closing, the solenoid valve 1403 remains open, and the tool holder 8 moves upward under the mold closing force, thereby driving the second piston rod 1402 to move upward along the second cylinder 1401. At this time, the nitrogen spring 11 is in a compressed and energy-accumulating state; the solenoid valve 1403 is then closed, and the first cylinder 1301 and the second cylinder 1401 are now isolated from the outside world. ④ After the mold is opened, the tool holder 8 moves downward under the action of the nitrogen spring 11, that is, the second piston rod 1402 moves downward and reduces the pressure in the second cylinder 1401, which is equivalent to evacuating the first cylinder 1301. The elastic force of the return spring 12 is smaller than the nitrogen spring 11, so the first piston rod 1302 will drive the slide 6 to contract under the action of the air pressure, and then return to the initial state (such as Figure 11 shown).

[0056] As can be seen, in Structure 1, the sliding blade 6 is driven to extend and retract by direct extension of a drive source. This typically involves a pneumatic cylinder in mold 4, requiring an external air pump or other device to drive the mold 4. Structure 2, on the other hand, utilizes the repositioning of the tool holder 8 combined with air pressure to drive the repositioning of the sliding blade 6. This eliminates the need for an external drive source, and the entire process only requires controlling the opening and closing of the solenoid valve 1403, thus reducing the cost of the mold 4. Both structures can meet practical requirements, and those skilled in the art can select the one they prefer based on their specific circumstances.

[0057] In this embodiment, in order to further improve the stability during cutting, Figure 7 As shown, a positioning structure may be provided between the slide 6 and the movable mold 402, the positioning structure including a positioning groove 16 and a positioning block 17, the positioning groove 16 being provided at the bottom end of the slide 6 and the positioning block 17 being provided in the movable mold 402; or the positioning block 17 being provided at the bottom end of the slide 6 and the positioning groove 16 being provided in the movable mold 402. It is understood that when the mold is closed, the positioning block 17 will engage with the positioning groove 16 to lock the position of the slide 6, thereby preventing the slide 6 from shifting during cutting.

[0058] Further, such as Figure 7 As shown, when the mold is closed and cut, an upper waste area for collecting the cut fabric 3 is left between the top end of the slide 6 and the fixed mold 401; a lower waste area for collecting the cut plate 2 is left between the bottom end of the slide 6 and the movable mold 402, thereby facilitating the collection and processing of waste from the fabric 3 and the plate 2.

[0059] like Figure 9 As shown, the specific installation method of the tool holder 8 is as follows: guide columns 9 are vertically provided at the four corners of the tool holder 8. The guide columns 9 are fixedly mounted on the fixed mold 401 and slide in cooperation with the tool holder 8. Limit bolts 10 are provided on both sides of the top of the tool holder 8. The limit bolts 10 are mounted on the fixed mold 401 and are suitable for limiting the position of the tool holder 8. The limit bolts 10 limit the vertical movement distance of the tool holder 8 to prevent the tool holder 8 from deviating or moving excessively during movement. The cooperation between the guide columns 9 and the limit bolts 10 ensures the stable sliding of the tool holder 8 in the vertical direction, thereby indirectly ensuring the stability and accuracy of the sliding knife 6 during the extension and retraction process.

[0060] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A mold, characterized in that: It includes a fixed mold, a movable mold and a sliding knife. The sliding knife is elastically and vertically slidably installed at the bottom end of the fixed mold and is in a horizontal state. When the fixed mold and the movable mold are closed, the fixed mold cooperates with the sharp blade at the top of the sliding knife to cut the fabric, and the movable mold cooperates with the shearing blade at the end of the sliding knife to cut the plate. A tool holder is vertically slidably mounted on the bottom end of the fixed mold, and the tool holder is connected to the fixed mold via an elastic member, and the slide is horizontally slidably mounted on the tool holder; the mold further comprises a driving device, the output end of which is connected to the slide; before the fabric is placed in the mold cavity of the mold, the driving device is adapted to drive the slide to move horizontally and away from the mold cavity; after the fabric is placed in the mold cavity, the driving device is adapted to drive the slide to move and reset, thereby separating the fabric and the plate; The driving device includes a return spring, a first cylinder, and an air source. The slide knife is connected to the tool holder via the return spring. The first cylinder is horizontally mounted on the tool holder, and one end of a piston rod is connected to the slide knife. The air source is disposed on the fixed mold and is connected to the first cylinder. When the slide knife contracts, the air source is adapted to pump air into the first cylinder to thereby drive the slide knife to move. When the slide knife is reset, the air source and the first cylinder are further connected to the outside world, and the slide knife is adapted to move and reset under the drive of the return spring. The air source includes a second cylinder and a solenoid valve. The second cylinder is installed on the fixed mold and the output end is connected to the tool holder. The solenoid valve is arranged outside the cylinder body of the second cylinder. The first cylinder is connected to the second cylinder. The elastic force of the elastic member is greater than the elastic force of the reset spring. When opening the mold, the tool holder is suitable for moving downward and resetting under the action of the elastic member, thereby making the second cylinder extend and evacuating air from the first cylinder to achieve the reset of the sliding knife. After the fabric is placed in the cavity, the solenoid valve is suitable for opening so that the second cylinder and the first cylinder are connected to the outside world.

2. The mold according to claim 1, wherein: A positioning block is provided in the movable mold, and a positioning groove is provided at the bottom end of the slide; or a positioning groove is provided in the movable mold, and a positioning block is provided at the bottom end of the slide; when the mold is closed, the positioning block cooperates with the positioning groove to achieve limit locking of the slide.

3. The mold according to claim 2, wherein: The elastic part is a nitrogen spring, and guide columns are vertically provided at the four corners of the tool holder. The guide columns are fixedly installed on the fixed mold and slide with the tool holder; limit bolts are provided on both sides of the top of the tool holder, and the limit bolts are installed on the fixed mold and are suitable for limiting the tool holder; an upper waste area for collecting cut fabrics is left between the top of the slide and the fixed mold; a lower waste area for collecting cut plates is left between the bottom of the slide and the movable mold.

4. A reverse packaging molding process for automobile parts, using the mold according to any one of claims 1 to 3, characterized in that: The steps include: S100: placing the stacked fabrics and panels in the mold cavity; S200: The ends of the fabric and the plate to be covered are respectively positioned at the top and bottom ends of the sliding knife in the mold; S300: The mold is closed, the fixed mold and the sliding knife cooperate to cut the fabric, and the movable mold and the sliding knife cooperate to cut the plate, thereby obtaining fabrics and plates of different lengths and sizes; S400: Fold and wrap the edges of the cut fabrics, panels and products.

5. The reverse packaging molding process for automobile parts according to claim 4, characterized in that: In step S100 , the fabric is a single-layer structure, and the board is a single-layer structure or a multi-layer structure.

6. The reverse packaging molding process for automobile parts according to claim 4, characterized in that: The mold closing process of step S300 also includes the following steps: the fabric, plate and product from top to bottom are formed into an integrated structure under the molding and curing action of the mold.

7. The reverse packaging molding process for automobile parts according to claim 4, characterized in that: The cutting process of step S300 also includes the following steps: the sliding knife cuts the plate from top to bottom, and the sliding knife cuts the fabric from bottom to top.

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