Thermal forming method for top-speed heating

Abstract

The embodiment of the invention provides a top-speed heating thermal forming method which comprises the following steps: blanking a raw material to obtain a to-be-processed blank; the blank is transferred to a feeding platform, then the blank is transferred to a laser heater, and laser heating is conducted on the blank to the austenitizing temperature; the austenitized blank is transferred to a punching machine table to be subjected to hot punching forming; wherein the laser heater is provided with a plurality of laser heads, the plurality of laser heads are arranged in an array mode to form array laser, and the plurality of laser heads are arranged according to the shape of a to-be-machined part on a blank, the laser heater is provided with the plurality of laser heads, the plurality of laser heads are arranged in the array mode to form the array laser, and meanwhile, the array laser is formed. The plurality of laser heads are arranged according to the shape of the to-be-processed part on the blank, so that the uniformity of heat rising can be kept in the process of rapidly heating the blank.

Description

Technical Field

[0001] The present invention relates to the technical field of hot stamping, and more particularly to a hot forming method with extremely rapid heating. Background Art

[0002] In the prior art, the hot stamping industry is currently divided into resistance wire heating furnaces or natural gas heating furnaces according to the heating method, and into long-line roller-bottom furnaces and multi-layer box-type heating furnaces according to the arrangement method. Among them, the heating rate of the heating furnace is slow, especially the high-temperature heating time is long and the heating rate is slow. It takes 4 minutes to heat a 1.4mm billet and 5 minutes to heat a 2.0mm billet. During the slow heating process, high-temperature oxidation of parts will occur. In order to prevent oxidation of parts in the heating furnace, a large amount of nitrogen needs to be introduced into the heating furnace to prevent oxidation, but the effect is often not good. Moreover, when the parts are not heated, the heating furnace usually does not cool down and performs insulation treatment.

[0003] The rapid heating method includes induction heating, which can be used for rapid heating. However, due to the surface and edge effects and non-uniformity of the magnetic field, the induction heating temperature is seriously non-uniform.

[0004] Currently, no effective solution has been proposed to the above problems.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0006] The purpose of this specification is to provide a thermoforming manufacturing method with extremely rapid heating to solve the above problems.

[0007] This specification provides a rapid heating thermoforming method, comprising:

[0008] Blanking the raw materials to obtain the blanks to be processed;

[0009] Transferring the blank to a loading platform, and then transferring the blank to a laser heater to perform laser heating on the blank to an austenitizing temperature;

[0010] Transferring the austenitized blank to a stamping machine for hot stamping;

[0011] The laser heater has a plurality of laser heads, which are arranged in an array to form an array laser, and the plurality of laser heads are arranged according to the shape of the part to be processed on the blank.

[0012] Preferably, the blank has a first region and a second region opposite to each other, and an array laser is arranged near the first region or the second region, or array lasers are arranged near both the first region and the second region.

[0013] Preferably, the array laser has a first station and a second station, and the blank is heated to 400-550°C by a low-power optical fiber or semiconductor laser or a heating furnace at the first station, and then heated to the austenitizing temperature by a high-power laser fiber laser at the second station.

[0014] Preferably, the laser spot of the laser heater is set to a rectangular spot, and the heating time is set to 10s-60s.

[0015] Preferably, during the laser heating of the blank, the blank can move forward or backward or leftward or rightward in a horizontal direction.

[0016] Preferably, during the process of laser heating the blank, the laser heater can move in a direction perpendicular to the movement of the blank.

[0017] Preferably, during the laser heating of the blank, the power of the laser heating is controlled so that the power of the laser heating at different positions on the surface of the blank is different, so that the blank has soft areas and hard areas.

[0018] Preferably, the blank is made of a thermoforming material with a pressure of 1500Mpa or 2000Mpa.

[0019] Preferably, the blank is made of phosphated steel plate, laser welded plate, patch plate or plate of unequal thickness.

[0020] Preferably, the surface of the blank may be coated with a light absorbing coating.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention is provided with a laser heater, so that the blank can be hot-formed by laser heating, and the blank can be heated stably and quickly, thereby avoiding oxidation of the blank during the heating process.

[0023] 2. The present invention provides a laser heater with multiple laser heads, and forms an array laser by configuring an array of multiple laser heads. At the same time, the multiple laser heads are arranged according to the shape of the part to be processed on the blank, so that the uniformity of heat rise can be maintained during the rapid heating of the blank.

[0024] 3. The present invention arranges array lasers near the first area or the second area of ​​the blank, or array lasers are arranged near both the first area and the second area of ​​the blank, thereby meeting the requirements for heating the blank in various situations, so that the blank can be heated quickly and evenly in various heating situations.

[0025] 4. The present invention sets a first station and a second station in the array laser, and the blank can be heated to 400-550°C at the first station by a low-power optical fiber or semiconductor laser or a heating furnace, and then heated to the austenitizing temperature by a high-power laser fiber laser at the second station, thereby reducing the generation of oxide scale and reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a schematic diagram of a production line of a rapid heating thermoforming method provided in an embodiment of this specification;

[0028] Figure 2 It is a schematic diagram of a double-station production line of a rapid heating thermoforming method provided in an embodiment of this specification;

[0029] Figure 3 It is a schematic diagram of the blanks of Example 1 and Example 2 of a rapid heating hot forming method provided in the embodiments of this specification;

[0030] Figure 4 This is a schematic diagram of a blank in Example 3 of a rapid heating thermoforming method provided in the embodiments of this specification;

[0031] Figure 5 It is a schematic diagram of soft zone and hard zone processing of a rapid heating thermoforming method provided in an embodiment of this specification;

[0032] Figure 6 It is a schematic diagram of a patch plate of an extremely fast heating thermoforming method provided in an embodiment of this specification.

[0033] In the figure: 1. Loading platform; 2. Laser heater; 3. Patch plate; 4. Punching machine; 5. Blank; 6. Light spot. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0035] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "middle", "lower", "inner", "outer", "front", "back", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an implementation method of the present invention based on its overall structure.

[0036] Reference Figure 1 As shown, the embodiment of the present application provides a rapid heating thermoforming method, comprising:

[0037] Blanking the raw materials to obtain the blanks to be processed;

[0038] The blank is transferred to a loading platform 1, and then transferred to a laser heater 2 to perform laser heating on the blank to an austenitizing temperature;

[0039] The austenitized blank is transferred to a stamping machine table for hot stamping forming;

[0040] The laser heater 2 has a plurality of laser heads, which are arranged in an array to form an array laser, and the plurality of laser heads are arranged according to the shape of the part to be processed on the blank.

[0041] In the present application, the raw material is blanked to obtain the blank to be processed. In the blanking process, the raw material can be processed into a blank of suitable shape according to the demand. Then the laser heater 2 is set to heat the blank 5, which can replace the method of heating by a heating furnace in the prior art, thereby reducing the time required for heating the blank 5.

[0042] Specifically, the laser heater 2 is provided with a plurality of laser heads. A person skilled in the art can arrange the plurality of laser heads in an array to form an array laser. The array laser is arranged in the shape of the part to be processed on the blank 5. This can meet various blank heating conditions.

[0043] In the above heating process, for the blank 5, the technicians in this field use materials that can be thermoformed. Preferably, the blank is made of a thermoforming material with a strength of 1500Mpa or 2000Mpa. That is, the use of the thermoforming material with the above strength can make the subsequent thermoforming process more stable. More preferably, the blank 5 is made of a phosphated steel plate, a laser welded plate, a patch plate 3 or a plate of unequal thickness. The technicians in this field can specifically use the above materials to blank to obtain a blank 5 of a corresponding shape.

[0044] Preferably, the surface of the blank can be coated with a light absorbing coating

[0045] In the above arrangement of the array laser, preferably, the blank 5 has a first region and a second region relative to each other, and the array laser is arranged near the first region or the second region, or the array laser is arranged near the first region and the second region. That is, according to actual needs, those skilled in the art can arrange the array laser in the first region or / and the second region of the blank, thereby satisfying the requirement of uniformly heating the blank 5 in various situations.

[0046] In the further setting of the laser heater 2, preferably, the laser spot 6 of the laser heater 2 is set to a rectangular spot, and the heating time is set to 10s-60s. Preferably, the heating time is set to 10s-20s. It is understandable that those skilled in the art set the laser spot 6 to a rectangular spot, which can facilitate the operation of the laser heater 2, so that the blank 5 can be more stable during the heating process. At the same time, the heating time is set to 10s-60s. Preferably, the heating time is set to 10s-20s. In the short-time heating process, the formation of oxide scale can be effectively avoided.

[0047] During the process of heating the blank 5, the moving path of the blank 5 can be set. Preferably, during the process of laser heating the blank 5, the blank 5 can move forward or backward or left or right in the horizontal direction. That is, those skilled in the art can adjust the moving path of the blank 5 in a timely manner according to the actual processing, so as to meet the requirement of uniform heating of the blank 5.

[0048] In the above process, those skilled in the art can achieve uniform heating of the blank 5 by setting the moving path of the blank 5. Preferably, during the laser heating of the blank 5, the laser heater 2 can move in a direction perpendicular to the moving direction of the blank 5. That is, those skilled in the art can also adjust the position of the laser heater 2 according to the needs. Thus, the need for uniform heating of the blank 5 can be further met.

[0049] In summary, those skilled in the art can adjust the position of the laser heater 2 while heating the moving path of the blank 5. The combination of the two can significantly improve the degree of temperature uniformity of the blank 5 during heating, thereby improving the effect of heating the blank.

[0050] Furthermore, a process of heating the blank 5 by the array laser in the above process is set. Preferably, the array laser has a first station and a second station. The blank 5 is heated to 400-550°C by a low-power optical fiber or semiconductor laser or a heating furnace at the first station, and then heated to the austenitizing temperature by a high-power laser fiber laser at the second station.

[0051] That is, the heating process is divided into two steps, and these two steps are completed by the first station and the second station respectively. During the operation of the first station, the blank 5 can be heated at a low temperature, specifically, it can be heated to 400°C to 550°C. Preferably, the blank 5 can be heated to 500°C to 530°C. It can be understood that at the aforementioned temperature, the probability of the appearance of oxide scale on the outer wall of the blank 5 can be greatly reduced. In addition, a cheaper low-power optical fiber heater or a laser heater 2 with a longer wavelength can be used to increase the laser absorption rate. After the first station is completed, the second station can quickly process the blank 5 to the austenitizing temperature, further avoiding the formation of oxide scale.

[0052] In a processing situation, the blank 5 needs to be heated in different areas. Preferably, during the laser heating of the blank 5, the power of the laser heating is controlled so that the power of the laser heating at different positions on the surface of the blank 5 is different, so that there are soft areas and hard areas on the blank 5. This can meet more processing requirements for the blank 5.

[0053] For the above content, the steps of the operation will be described in detail through multiple embodiments below:

[0054] Example 1

[0055] use Figure 1 The laser heating production line shown is used for production;

[0056] Use a loading robot to take one of the neatly stacked 1.4 mm blanks and place it on the loading platform 1.

[0057] Arrange the laser heads in an array, the size of the laser heads is 205*110mm, the spot size is set to 210*120mm, and the power of the laser heads in each laser heater 2 is set to 20KW. Figure 3 As shown;

[0058] The laser heater 2 is turned on for heating, and the blank 5 is heated to austenitization. Specifically, the temperature is heated to 970 degrees, and the heating time is set to 10 seconds; after the heating is completed, the laser heater 2 is turned off;

[0059] The heated austenitized blank 5 is transferred to the punching machine table 4 for punching.

[0060] Example 2

[0061] use Figure 2 The laser heating production line shown has a first station and a second station for production;

[0062] Use a loading robot to take one of the neatly stacked 1.4 mm blanks and place it on the loading platform 1;

[0063] The arrayed laser heaters 2 are turned on, the laser head size is set to 205*110mm, the spot size is 120*30mm, and the laser head power in each laser heater 2 is set to 3KW. Figure 3 As shown. The blank 5 is heated to 515°C, the heating time is 15s, the blank 5 moves horizontally back and forth on the loading platform 1, and the laser heater 2 moves horizontally in a direction perpendicular to the moving direction of the blank 5;

[0064] Then the blank is transferred to the loading platform 1;

[0065] The arrayed laser heaters 2 are turned on, the laser head size is set to 205*110mm, the spot size is 120*30mm, the laser head power in each laser heater 2 is 6KW, the blank 5 moves horizontally back and forth on the loading platform 1, and the laser heater 2 moves in the horizontal direction perpendicular to the moving direction of the blank 5;

[0066] The blank 5 is heated to a temperature of 970°C, and the heating time is set to 20s; after the heating is completed, the laser heater 2 is turned off;

[0067] The heated austenitized blank 5 is transferred to the punching machine table 4 for punching.

[0068] Example 3

[0069] use Figure 1The laser heating production line shown is used for production;

[0070] Use a loading robot to take one of the neatly stacked 1.6mm B-pillars and place it on the loading platform 1;

[0071] The arrayed laser heaters 2 are turned on and arranged into the shape of the upper part of the B-pillar (the hard area). The size of the light spot 6 is 210*120mm, and the power of each laser head is 12KW;

[0072] The array of laser heaters 2 is turned on and arranged into the shape of the lower part of the B-pillar (soft area). The size of the spot 6 is 210*120mm. The power of each 12KW laser head is set to 3KW. Figure 4 As shown;

[0073] Turn on laser heater 2 to heat the B-pillar. Heat the hard zone to 1000°C and the soft zone to 600°C. Set the heating time to 12s. At the same time, open the nitrogen pipe next to the laser to spray nitrogen to prevent oxidation of the blank. Turn off the laser after heating is completed.

[0074] The heated austenitized blank 5 is transferred to the punching machine table 4 for punching.

[0075] Example 4

[0076] use Figure 1 The laser heating production line shown is used for production;

[0077] Use a loading robot to take one of the neatly stacked 1.6 mm A-pillar patch plates 3 and place it on the loading platform 1;

[0078] The laser heads are arrayed to form the shape of the A-pillar blank and the patch plate 3 , wherein the size of the light spot 6 at the patch plate 3 is set to 210*120mm, and the power of each laser head is 12KW.

[0079] Turn on the laser heater 2 to heat the blank 2 to austenitization, heat the patch plate 3A column to austenitization, heat the temperature to 950 degrees, and set the heating time to 20s; turn off the laser heater 2 after the heating is completed;

[0080] The heated austenitized blank 5 is transferred to the punching machine table 4 for punching.

[0081] In summary, the hot stamping parts prepared by the above method have a faster heating rate. The oxidation that occurs during the short heating process is greatly reduced. In addition, the heating process does not require a traditional long-line heating furnace or a multi-layer box heating furnace, thereby reducing the floor space. Moreover, the laser heater 2 is in an inoperative state when the blank is not heated. In this case of no power consumption, energy and carbon emissions can be saved.

[0082] Although different specific embodiments are mentioned in the content of this application, this application is not limited to the situations described in the industry standards or embodiments, etc. Some industry standards or slightly modified implementation plans based on the implementation of the custom methods or embodiments can also achieve the same, equivalent or similar, or predictable implementation effects after deformation of the above embodiments. The embodiments of data acquisition, processing, output, judgment methods, etc. after these modifications or deformations can still fall within the scope of the optional implementation plans of this application.

[0083] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present application without departing from the spirit of the present application. It is intended that the attached embodiments include these modifications and changes without departing from the present application.

Claims

1. A thermoforming method with extremely fast heating, It is characterized in that include: Blanking the raw materials to obtain the blanks to be processed; Transferring the blank to a loading platform, and then transferring the blank to a laser heater to perform laser heating on the blank to an austenitizing temperature; Transferring the austenitized blank to a stamping machine for hot stamping; The laser heater has a plurality of laser heads, which are arranged in an array to form an array laser, and the plurality of laser heads are arranged according to the shape of the part to be processed on the blank.

2. The extremely fast heating thermoforming method according to claim 1, It is characterized in that The blank has a first region and a second region facing each other, and an array laser is arranged near the first region or the second region, or array lasers are arranged near both the first region and the second region.

3. The extremely fast heating thermoforming method according to claim 1, It is characterized in that The array laser has a first station and a second station. The blank is heated to 400-550°C by a low-power optical fiber or semiconductor laser or a heating furnace at the first station, and then heated to an austenitizing temperature by a high-power laser fiber laser at the second station.

4. The extremely fast heating thermoforming method according to claim 1, It is characterized in that The laser spot of the laser heater is set to a rectangular spot, and the heating time is set to 10s-60s.

5. The extremely fast heating thermoforming method according to claim 1, It is characterized in that During the laser heating of the blank, the blank may move forward or backward or leftward or rightward in a horizontal direction.

6. The extremely fast heating thermoforming method according to claim 1, It is characterized in that During the process of laser heating the blank, the laser heater may move in a direction perpendicular to the moving direction of the blank.

7. The extremely fast heating thermoforming method according to claim 1, It is characterized in that During the laser heating of the blank, the power of the laser heating is controlled so that the power of the laser heating at different positions on the surface of the blank is different, so that the blank has soft areas and hard areas.

8. The extremely fast heating thermoforming method according to claim 1, It is characterized in that The blank is made of a thermoforming material of 1500Mpa or 2000Mpa.

9. The extremely fast heating thermoforming method according to claim 8, It is characterized in that The blank is made of phosphating steel plate, laser welded plate, patch plate or plate of unequal thickness.

10. The extremely fast heating thermoforming method according to claim 1, It is characterized in that The surface of the blank can be coated with a light absorbing coating.

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