Indirect thermal forming processing technology of flitch

Abstract

The invention relates to the technical field of plate thermal forming, in particular to a flitch indirect thermal forming machining process which comprises the following steps that S100, a prepared flitch is subjected to cold stamping, so that the flitch is pressed into a formed blank in a preset shape; s200, the formed blank in the step S100 is put into a heating conveying device through a feeding port to be preheated, and a discharging port of the heating conveying device conveys the preheated formed blank to a hot pressing station from the discharging port; and S300, the preheated formed blank is quenched under pressing of a mold, and a finished product is obtained after cooling and hardening. Wherein the heating and conveying device is at least provided with a feeding port and a discharging port, and the heating and conveying device is used for heating the formed blank and transferring the formed blank to a hot pressing station. According to the invention, the time for waiting for heating the forming material is saved, and the forming period is greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of sheet material thermoforming, and in particular to an indirect thermoforming process for sheet materials. Background Art

[0002] Indirect hot forming technology refers to cold stamping the sheet metal into shape, then heating it, placing it in a water-cooled mold, and quenching it under the pressure of a high-speed hydraulic press to press out martensitic ultra-high-strength hot-formed parts. The hot parts are placed in a cold mold to harden and determine the final geometric shape.

[0003] Compared with direct thermoforming technology, indirect thermoforming technology is relatively time-consuming in terms of production cycle. The main time consumption is that the sheet needs to be heated to a certain temperature before the molding operation can be carried out. This heating process takes a certain amount of time, which is one of the main reasons for the relatively long molding cycle and the impact on production efficiency.

[0004] Based on this, it is necessary to design an indirect thermoforming process to shorten the molding cycle. Summary of the invention

[0005] The present invention aims at the deficiencies in the prior art and provides the following technical solutions:

[0006] An indirect hot forming process for a sheet material comprises the following steps:

[0007] S100, cold stamping the prepared sheet material so that the sheet material is pressed into a formed blank of a predetermined shape;

[0008] S200, placing the molded blank in S100 through an inlet into a heating and conveying device for preheating, and the outlet of the heating and conveying device delivers the preheated molded blank from the outlet to a hot pressing station;

[0009] S300, the preheated shaped blank is quenched under the pressure of the mold, and a finished product is obtained after cooling and hardening;

[0010] The heating and conveying device has at least one inlet and one outlet, and is used to heat the formed blank and transfer it to the hot pressing station;

[0011] When the molding blank moves from the inlet to the outlet, the molding blank is heated to the molding temperature, and the mold completes quenching, cooling and hardening of the molding blank at least once.

[0012] As an improvement of the above technical solution, the heating conveying device at least includes: a carrying platform, a conveying component, and a transfer component;

[0013] The carrying platform moves along the conveying assembly and heats the transferred workpiece. The carrying platform realizes switching in the moving direction of the conveying assembly through the transfer assembly.

[0014] As an improvement of the above technical solution, the carrier platform at least comprises: a base, a heating cover;

[0015] The base comprises a bearing plate and a support plate arranged parallel to the bottom surface of the bearing plate;

[0016] The support plates are provided with driving components, the support plates near both sides of the support plates are provided with slots, and the corresponding bottom surface of the heating cover has a limiting plug that matches the slot. The heating cover heats the internal area when powered on.

[0017] As an improvement of the above technical solution, the drive assembly at least includes a hub motor assembly;

[0018] The hub motor assembly is located in a clearance groove provided on the support plate, and a sliding contact extends from the bottom surface of one side opposite to the support plate.

[0019] As an improvement of the above technical solution, the conveying component at least includes an incoming material transport component;

[0020] The incoming material transport assembly comprises a heat preservation channel with openings at both ends, a conductive slide rail 1 is laid on the inner bottom surface of the heat preservation channel, the conductive slide rail 1 is adapted to the wheel hub motor assembly, and the sliding contact is slidably matched with a conductive slide groove 1 on a side wall of the conductive slide rail;

[0021] The heat preservation channel is provided with gate mechanisms near both ends thereof for opening or closing the channel.

[0022] As an improvement of the above technical solution, the conveying assembly further includes a retreating transport assembly;

[0023] The retreating platform transport assembly comprises a transport channel with two ends and a top opening, a conductive slide rail 2 is laid on the bottom surface of the transport channel, the conductive slide rail 2 is adapted to the wheel hub motor assembly, and the sliding contact is slidably matched with a conductive slide groove 2 on the side wall of the conductive slide rail 2;

[0024] The retreating platform transport component is located below the incoming material transport component and is connected via a support member.

[0025] As an improvement of the above technical solution, the transfer assembly is located at both ends of the incoming material transport assembly and the retreating platform transport assembly, and the transfer assembly at least includes: a transfer platform, a transmission screw subassembly, a fixed enclosure, and a drive motor;

[0026] The cross section of the fixed enclosure is U-shaped and is connected to the corresponding ends of the incoming material transport component and the retreating platform transport component, and forms a channel for the transfer platform to rise to align with the inner bottom surface of the insulation channel, and to descend to align with the inner bottom surface of the transport channel;

[0027] The transfer platform is transmission-connected to a plurality of transmission screw sub-assemblies, the top ends of the transmission screw sub-assemblies are all connected to the fixed enclosure, and the bottom ends are all transmission-connected to the drive motor at the bottom of the fixed enclosure;

[0028] The top surface of the transfer platform is paved with three conductive slide rails arranged in parallel, and the three conductive slide rails are adapted to the first conductive slide rail and the second conductive slide rail.

[0029] As an improvement of the above technical solution, the conductive slide rail has a conductive spring at its third end, the conductive spring is a C-shaped structure, one end of which is fixedly connected to the conductive slide rail, and the other end of which is fixedly connected to the conductive slide rail through an elastic member.

[0030] When the conductive slide rail three is matched with the conductive slide rail one or the conductive slide rail two, the middle part of the conductive spring sheet is in a compressed state.

[0031] As an improvement of the above technical solution, the two guide rails on the conductive slide rail one, the conductive slide rail two, and the conductive slide rail three are respectively connected to the positive and negative poles of the power supply, and the carrying platform is connected to the two guide rails to achieve connection between the positive and negative poles of the power supply.

[0032] As an improvement of the above technical solution, when the molded blank is completely transferred to the transfer platform, the conductive slide rail three is disconnected from the power supply circuit.

[0033] Beneficial effects of the present invention:

[0034] The preheating process of the forming blanks has been optimized. The forming blanks are transferred through the heating conveying device, so that the materials can be transferred from the cold stamping station to the hot forming station. The forming blanks are heated and kept warm during the transfer process, so that the forming blanks are heated to a suitable temperature when transferred to the hot forming station, and can be directly hot formed. This saves the time required to wait for the forming materials to be heated, greatly shortening the forming cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the heating and conveying device in the present invention;

[0036] Figure 2 A top view of the heating and conveying device of the present invention;

[0037] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0038] Figure 4 for Figure 2 Sectional view at the middle BB;

[0039] Figure 5 It is a schematic diagram of the assembly structure of the transfer platform and the transmission screw subassembly in the present invention;

[0040] Figure 6 It is a schematic diagram of the structure of the mating end of the conductive slide rail 3 in the present invention;

[0041] Figure 7 It is a schematic diagram of the overall structure of the carrier platform in the present invention;

[0042] Figure 8 It is a schematic diagram of the top view of the carrying platform in the present invention;

[0043] Fig. 9 for Figure 8 Sectional view at CC;

[0044] Fig.10 It is a schematic diagram of the assembly structure of the limit plug and the slot in the present invention;

[0045] Fig.11 It is a schematic diagram of the assembly structure of the driving assembly and the support plate in the present invention;

[0046] Fig.12 It is a schematic diagram of the cross-sectional structure of the conductive slide rail 2 and the conductive slide rail 3 in the present invention;

[0047] Fig.13 This is a diagram of the electrical connection relationship between the conductive slide rail 2, the conductive slide rail 3 and the carrying platform in the present invention.

[0048] 1. The support plate is provided with a plurality of support members, each of which is provided with a plurality of support members, and each of which is provided with a plurality of support members. The support plate is provided with a plurality of support members, each of which is provided with a plurality of support members. The support plate is provided with a plurality of support members, each of which is provided with a plurality of support members. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] Compared with direct thermoforming technology, indirect thermoforming technology is relatively time-consuming in terms of production cycle. The main time consumption is that the sheet needs to be heated to a certain temperature before the molding operation can be carried out. This heating process takes a certain amount of time, which is one of the main reasons for the relatively long molding cycle and the impact on production efficiency.

[0051] See attached Figure 1-13 To solve the above technical problems, an indirect hot forming process of a sheet material is provided, comprising the following steps:

[0052] S100, cold stamping the prepared sheet material so that the sheet material is pressed into a formed blank of a predetermined shape;

[0053] S200, placing the molded blank in S100 through an inlet into a heating and conveying device for preheating, and the outlet of the heating and conveying device delivers the preheated molded blank from the outlet to a hot pressing station;

[0054] S300, the preheated shaped blank is quenched under the pressure of the mold, and a finished product is obtained after cooling and hardening;

[0055] The heating and conveying device has at least one inlet and one outlet, and is used to heat the formed blank and transfer it to the hot pressing station;

[0056] When the molding blank moves from the inlet to the outlet, the molding blank is heated to the molding temperature, and the mold completes quenching, cooling and hardening of the molding blank at least once.

[0057] In the above indirect thermoforming step, the preheating link of the forming blank is optimized, and the forming blank is transferred by the heating conveying device, so that the material can be transferred from the cold stamping station to the thermoforming station, and the forming blank is heated and kept warm during the transfer process, so that the forming blank is heated to a suitable temperature when it is transferred to the thermoforming station, and can be directly thermoformed. This saves the time required to wait for the forming material to be heated, greatly shortening the forming cycle.

[0058] In order to facilitate understanding of how the preheating step is optimized and the specific structure of the heating and conveying device, a specific implementation of the heating and conveying device is given.

[0059] The heating and conveying device includes: a carrying platform 100 , a conveying component 200 , and a transfer component 300 .

[0060] The carrying platform 100 moves through the conveying assembly 200 and heats the transferred workpiece. The carrying platform 100 switches the moving direction of the conveying assembly 200 through the transfer assembly 300 .

[0061] Specifically, the carrying platform 100 is used to carry and preheat the formed blanks. The carrying platform 100 travels back and forth between the cold stamping station and the hot forming station through the conveying assembly 200, and the carrying platform 100 needs to use the transfer assembly 300 to better achieve the switching of the moving direction of the conveying assembly 200, that is, back and forth.

[0062] See attached Figure 7-Figure 9 As shown, in order to facilitate the understanding of the present invention, a specific implementation of the carrier platform 100 is provided. The carrier platform 100 is used to carry the molded blanks, and to preheat and transfer the molded blanks.

[0063] The carrying platform 100 includes a base 110 and a heating cover 120 .

[0064] The base 110 includes a supporting plate 111 and a supporting plate 112 disposed parallel to the bottom surface of the supporting plate 111 .

[0065] The support plates 112 are provided with driving components 130, and slots 113 are provided on the support plates 112 on both sides of the support plates 112 on the supporting plate 111. The corresponding bottom surface of the heating cover 120 is provided with a limiting plug 121 that cooperates with the slot 113. The heating cover 120 heats the internal area when powered on.

[0066] Specifically, the top surface of the base 110 is a plane for placing the molded blank, and the heating cover 120 cooperates with the top surface of the base 110 to form a relatively closed cavity, and the molded blank is located in the cavity. Therefore, on the one hand, this structure can ensure the safety of the molded blank during the transfer process; on the other hand, when the heating cover 120 generates heat inside to heat the molded blank, the preheating and heat preservation effects are better due to the relatively closed environment.

[0067] In this embodiment, the heating cover 120 is electrically heated. In order to ensure the detachable structure of the base 110 and the heating cover 120, and the stability of the electrical connection, a slot 113 is opened on the top surface of the base 110, and a limiting plug 121 that cooperates with the slot 113 is provided at the corresponding position of the bottom surface of the heating cover 120.

[0068] When the heating cover 120 is matched with the base 110, the limit plug 121 extends into the slot 113, so that the heating cover 120 and the base 110 form a snap-on structure. The limit plug 121 and the slot 113 are similar to the structure and function of a plug and a socket. When the two are combined, the current flows through the limit plug 121 on one side to the limit plug 121 on the other side. After the electric heating mechanism c is powered on, the electric energy can be converted into heat energy to achieve preheating and heat preservation. Preferably, the carrier plate 111 and the heating cover 120 have a heat preservation and heat insulation mechanism.

[0069] The driving assembly 130 can drive the carrier platform 100 to move when powered on.

[0070] See attached Fig.10 As shown, in order to ensure stable contact between the limiting plug 121 and the slot 113, an implementation method is provided.

[0071] In this embodiment, a conductive member a is provided on the opposite side wall of the portion of the limit plug 121 extending into the slot 113. Preferably, the conductive member a is arc-shaped, with one end fixed to the corresponding side wall of the limit plug 121 and the other end fixed to the corresponding side wall of the limit plug 121 through an elastic conductive member b.

[0072] When the limiting plug 121 extends into the slot 113 , the conductive member a is compressed and deformed to a certain extent, thereby ensuring that the limiting plug 121 maintains stable contact with the slot 113 .

[0073] See attached Fig.11 As shown, in order to facilitate understanding of the structure of the driving assembly 130, an implementation method is provided.

[0074] The driving assembly 130 includes a hub motor assembly 131 .

[0075] The hub motor assembly 131 is located in the avoidance groove 114 provided on the support plate 112 , and a sliding contact 132 extends from the bottom surface of one side opposite to the support plate 112 .

[0076] In order to simplify the structure, a hub motor assembly 131 is used, preferably, a built-in hub motor structure is used. A clearance groove 114 is opened at the bottom of the support plate 112, and the hub motor assembly 131 is installed in the clearance groove 114, which is not easily touched by foreign objects and ensures stable operation.

[0077] The sliding contact 132 is used to cooperate with the track socket for power supply to ensure stable power supply during movement.

[0078] See attached Figure 1-Figure 3 As shown, in combination with the above, the present invention also provides a specific implementation of the conveying component 200.

[0079] The conveying assembly 200 includes an incoming material transport assembly 210 .

[0080] The incoming material transport component 210 includes an insulation channel 211 with openings at both ends. A conductive slide rail 212 is laid on the bottom surface of the insulation channel 211. The conductive slide rail 212 is adapted to the hub motor component 131, and the sliding contact 132 is slidably matched with a conductive slide groove 213 on the side wall of the conductive slide rail 212.

[0081] Gate mechanisms 214 are installed near both ends of the heat preservation channel 211 to open or close the channel.

[0082] Since the formed blanks are gradually heated during the transfer process, especially during the transfer process of incoming materials, the heat preservation channel 211 is used to keep the heat and insulate on the one hand, and to ensure the safety of the transfer process on the other hand.

[0083] Two conductive rails 212 are laid on the inner bottom surface of the insulation channel 211, which are respectively adapted to the corresponding support plates 112. When the hub motor assembly 131 is working, it rolls along the conductive rail 212. In order to prevent the hub motor assembly 131 from derailing, the cross section of the conductive rail 212 is set to a convex structure, and the cross section of the hub motor assembly 131 and the bottom surface of the support plate 112 is set to a concave structure. When the hub motor assembly 131 rolls on the conductive rail 212, the inner wall of the air avoidance groove 114 and the raised part of the top surface of the conductive rail 212 form a limit, thereby suppressing derailment.

[0084] The conductive slide groove 213 cooperates with the sliding contact 132, similar to the cooperation relationship between a plug and a track socket, to ensure stable power supply during movement.

[0085] In addition, the design of the gate mechanism 214 can further improve the airtightness of the insulation channel 211, and the opening or closing can be achieved through an induction switch to achieve automatic control.

[0086] See attached Figure 3 As shown, in combination with the above, the present invention also provides a specific implementation of the conveying component 200.

[0087] The conveying assembly 200 further includes a retractable transport assembly 220 .

[0088] The retreating platform transport assembly 220 includes a transport channel 221 with openings at both ends and the top. A conductive slide rail 222 is laid on the bottom surface of the transport channel 221. The conductive slide rail 222 is adapted to the hub motor assembly 131, and the sliding contact 132 is slidably matched with a conductive slide groove 223 on the side wall of the conductive slide rail 222.

[0089] The retreating transport assembly 220 is located below the incoming material transport assembly 210 and is connected via a support member 224 .

[0090] The conveying assembly 200 is composed of two parts: the incoming material transport assembly 210 and the retreating platform transport assembly 220. The incoming material transport assembly 210 is used to transfer the formed blank from the cold stamping station to the hot forming station, and the retreating platform transport assembly 220 is used to transfer the carrying platform 100 from the hot forming station to the cold stamping station, thus realizing round trip.

[0091] The structure of the second conductive slide rail 222 is consistent with that of the first conductive slide rail 212 .

[0092] In order to simplify the structure of the conveying assembly 200, the retreating transport assembly 220 is arranged below the incoming material transport assembly 210, and the edges on both sides of the retreating transport assembly 220 are connected to both sides of the bottom surface of the incoming material transport assembly 210 through multiple support members 224 to achieve integration.

[0093] See attached Figure 4-Figure 5 As shown, the present invention also provides a specific implementation of the conveying component 200.

[0094] The transfer assembly 300 is located at both ends of the incoming material transport assembly 210 and the retreating platform transport assembly 220 . The transfer assembly 300 includes: a transfer platform 310 , a transmission screw subassembly 320 , a fixed enclosure 330 , and a drive motor 340 .

[0095] The cross-section of the fixed enclosure 330 is U-shaped and is connected to the corresponding ends of the incoming material transport component 210 and the retreating platform transport component 220, and constitutes a channel for the transfer platform 310 to rise to align with the inner bottom surface of the insulation channel 211, and to descend to align with the inner bottom surface of the transport channel 221.

[0096] The transfer platform 310 is transmission-connected to a plurality of transmission screw subassemblies 320 , the top ends of the transmission screw subassemblies 320 are all connected to the fixed enclosure 330 , and the bottom ends are all transmission-connected to the drive motor 340 at the bottom of the fixed enclosure 330 .

[0097] The top surface of the transfer platform 310 is paved with parallel conductive slide rails 311 , and the conductive slide rails 311 are compatible with the conductive slide rails 1 212 and 222 .

[0098] The transfer components 300 are arranged at the ends of the incoming material transport component 210 and the retreating stage transport component 220, that is, one group is arranged at the end at the cold stamping station, and one group is arranged at the end at the hot forming station.

[0099] During operation, the driving motor 340 drives the transmission screw subassembly 320 to rotate, so that the transfer platform 310 rises or falls.

[0100] When the carrying platform 100 rises to be aligned with the inner bottom surface of the heat preservation channel 211 , the carrying platform 100 can be moved from the heat preservation channel 211 to the transfer platform 310 , or from the transfer platform 310 to the heat preservation channel 211 .

[0101] When the carrying platform 100 is lowered to be aligned with the inner bottom surface of the transportation channel 221 , the carrying platform 100 can be moved from the transportation channel 221 to the transfer platform 310 , or from the transfer platform 310 to the transportation channel 221 .

[0102] In order to ensure the stable movement of the transfer platform 310 , a plurality of transmission screw subassemblies 320 are provided. Preferably, four transmission screw subassemblies 320 are provided and are evenly distributed at the four corners of the transfer platform 310 .

[0103] Preferably, the structures of the conductive slide rail three 311, the conductive slide rail one 212, and the conductive slide rail two 222 are consistent.

[0104] See attached Figure 6 As shown, in combination with the above, in order to ensure that the conductive slide rail 3 311 can be stably connected with the conductive slide rail 1 212 and the conductive slide rail 2 222, the matching end of the conductive slide rail 3 311 is optimized.

[0105] A conductive spring piece 312 is provided at the end of the conductive slide rail 311. The conductive spring piece 312 is a C-shaped structure, one end of which is fixedly connected to the conductive slide rail 311, and the other end of which is fixedly connected to the conductive slide rail 311 through an elastic member 313;

[0106] When the third conductive slide rail 311 is matched with the first conductive slide rail 212 or the second conductive slide rail 222 , the middle part of the conductive spring piece 312 is in a compressed state.

[0107] The conductive spring piece 312 and the conductive member a have the same structure. Preferably, the conductive spring piece 312 and the conductive member a are made of copper.

[0108] The elastic member 313 and the elastic conductive member b have the same structure. Preferably, the elastic member 313 and the elastic conductive member b are both springs.

[0109] See attached Fig.13 As shown, in this solution, the two guide rails on the conductive slide rail 1 212, the conductive slide rail 222, and the conductive slide rail 3 311 are respectively connected to the positive and negative electrodes of the power supply, and the carrier platform 100 is connected to the two guide rails to achieve the positive and negative electrodes of the power supply. After power is turned on, the carrier platform 100 can be driven, thereby realizing the transfer and preheating of the formed blank.

[0110] Preferably, when the formed blank is completely transferred to the transfer platform 310, the conductive slide rail 311 is disconnected from the power supply circuit. To achieve the above function, a power supply circuit control switch can be set on the transfer platform 310, or the power supply circuit can be controlled to be on and off.

[0111] When the molded blank is transferred to the transfer platform 310, the heating cover 120 needs to be opened to take out the preheated molded blank, so heating is no longer required, and the operation safety can be guaranteed to avoid live working.

[0112] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. An indirect thermoforming process for a sheet material, characterized in that: The following steps are involved: S100, cold stamping the prepared sheet material so that the sheet material is pressed into a formed blank of a predetermined shape; S200, placing the molded blank in S100 through an inlet into a heating and conveying device for preheating, and the outlet of the heating and conveying device delivers the preheated molded blank from the outlet to a hot pressing station; S300, the preheated shaped blank is quenched under the pressure of the mold, and a finished product is obtained after cooling and hardening; The heating and conveying device has at least one inlet and one outlet, and is used to heat the formed blank and transfer it to the hot pressing station; When the molding blank moves from the inlet to the outlet, the molding blank is heated to the molding temperature, and the mold completes quenching, cooling and hardening of the molding blank at least once.

2. The indirect thermoforming process of a sheet material according to claim 1, characterized in that: The heating and conveying device comprises at least: a carrying platform (100), a conveying component (200), and a transfer component (300); The carrying platform (100) moves along the conveying component (200) and heats the transferred workpiece. The carrying platform (100) switches the moving direction of the conveying component (200) through the transfer component (300).

3. The indirect thermoforming process of a sheet material according to claim 2, characterized in that: The carrying platform (100) comprises at least: a base (110) and a heating cover (120); The base (110) comprises a bearing plate (111) and a support plate (112) arranged parallel to the bottom surface of the bearing plate (111); The support plates (112) are provided with a driving assembly (130), the support plates (112) on both sides of the support plates (112) are provided with slots (113), and the corresponding bottom surface of the heating cover (120) is provided with a limit plug (121) that cooperates with the slot (111), and the heating cover (120) heats the internal area when powered on.

4. The indirect thermoforming process of a sheet material according to claim 3, characterized in that: The driving assembly (130) comprises at least a hub motor assembly (131); The wheel hub motor assembly (131) is located in a clearance groove (114) provided on the support plate (112), and a sliding contact (132) extends from the bottom surface of one side opposite to the support plate (112).

5. The indirect thermoforming process of a sheet material according to claim 4, characterized in that: The conveying component (200) at least comprises an incoming material transport component (210); The incoming material transport component (210) comprises a heat preservation channel (211) with openings at both ends, a conductive slide rail (212) is laid on the inner bottom surface of the heat preservation channel (211), the conductive slide rail (212) is adapted to the wheel hub motor component (131), and the sliding contact (132) is slidably matched with a conductive slide groove (213) on the side wall of the conductive slide rail (212); The heat preservation channel (211) is provided with gate mechanisms (214) near both ends thereof for opening or closing the channel.

6. The indirect thermoforming process of a sheet material according to claim 5, characterized in that: The conveying component (200) further includes a retreating transport component (220); The retreating platform transport component (220) comprises a transport channel (221) with two ends and a top opening, a second conductive slide rail (222) is laid on the inner bottom surface of the transport channel (221), the second conductive slide rail (222) is adapted to the wheel hub motor component (131), and the sliding contact (132) is slidably matched with a second conductive slide groove (223) on the side wall of the second conductive slide rail (222); The retreating platform transport component (220) is located below the incoming material transport component (210) and is connected via a support member (224).

7. The indirect thermoforming process of a sheet material according to claim 6, characterized in that: The transfer assembly (300) is located at both ends of the incoming material transport assembly (210) and the retreating platform transport assembly (220), and the transfer assembly (300) at least comprises: a transfer platform (310), a transmission screw subassembly (320), a fixed enclosure (330), and a drive motor (340); The fixed enclosure (330) has a U-shaped cross section and is connected to the corresponding ends of the incoming material transport component (210) and the retreating platform transport component (220), and forms a channel for the transfer platform (310) to rise to align with the inner bottom surface of the insulation channel (211), and to descend to align with the inner bottom surface of the transport channel (221); The transfer platform (310) is transmission-connected to a plurality of transmission screw subassemblies (320), the top ends of the transmission screw subassemblies (320) are all connected to the fixed enclosure (330), and the bottom ends are all transmission-connected to the drive motor (340) at the bottom of the fixed enclosure (330); The top surface of the transfer platform (310) is paved with conductive slide rails 3 (311) arranged in parallel, and the conductive slide rails 3 (311) are compatible with the conductive slide rails 1 (212) and 2 (222).

8. The indirect thermoforming process of a sheet material according to claim 7, characterized in that: The conductive slide rail 3 (311) has a conductive spring sheet (312) at its end. The conductive spring sheet (312) is a C-shaped structure, one end of which is fixedly connected to the conductive slide rail 3 (311), and the other end of which is fixedly connected to the conductive slide rail 3 (311) via an elastic member (313); When the conductive slide rail three (311) is matched with the conductive slide rail one (212) or the conductive slide rail two (222), the middle part of the conductive spring sheet (312) is in a compressed state.

9. The indirect thermoforming process of a sheet material according to claim 8, characterized in that: The two guide rails on the conductive slide rail one (212), the conductive slide rail two (222), and the conductive slide rail three (311) are respectively connected to the positive and negative electrodes of the power supply, and the carrying platform (100) is connected to the two guide rails to achieve communication between the positive and negative electrodes of the power supply.

10. The indirect thermoforming process of a sheet material according to claim 9, characterized in that: When the molded blank is completely transferred to the transfer platform (310), the conductive slide rail three (311) is disconnected from the power supply circuit.

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