Automobile spare tire cover outer periphery hemming die and control method thereof

Abstract

The present invention discloses a peripheral edging die for a spare tire cover plate of an automobile and a control method thereof, comprising an upper die and a lower die, wherein the upper die is arranged in an upper die seat, and the lower die is arranged in a lower die seat, wherein the upper die seat and the lower die seat cooperate with each other, wherein a pressing plate is connected to the cavity of the upper die through a lifting mechanism, and a trimming knife is arranged at the edge of the upper die; wherein a supporting plate is connected to the cavity of the lower die through a lower pressure spring, wherein the supporting plate is arranged corresponding to the pressing plate, and an edging block is arranged at a position corresponding to the trimming knife in the lower die, wherein a transverse reserved cavity is arranged inside the trimming knife, and a longitudinal edging cavity is arranged inside the edging block. The present invention adopts a heating and melting method to heat the material in the edging area and then edging it, and the surface flatness is good; a trimming knife is used to cut the reserved edging to ensure the uniformity of each position and the quality of the edging; an edging cavity is arranged to ensure that the edging material flows smoothly into the cavity to avoid overflow.

Description

Technical Field

[0001] The invention relates to an edge wrapping die and a control method thereof, and in particular to an edge wrapping die for the outer periphery of a spare tire cover plate of an automobile and a control method thereof. Background Art

[0002] The spare tire cover plate, which is formed by the composite of PP honeycomb board substrate and PET skin, needs to be thinned on the periphery to ensure that there is no opening on the periphery. In this way, there will be a circle on the periphery of the product with a thickness of 0.5mm. However, the PP honeycomb board is relatively hard, so there will be a sharp periphery, which is easy to hurt the hand. If the thickness of this 0.5mm platform is changed to 2mm, the product will have cracks affecting the appearance. Therefore, it is necessary to perform edge banding on the spare tire cover plate. Most of the existing edge banding methods use glue to seal the edge, and a small part uses tooling and mechanical edge banding. The edge banding is not ideal and the appearance has defects. This processing method is inefficient and has low precision, and the quality is difficult to guarantee. Therefore, it is very necessary to design an edge banding mold to perform edge banding of the spare tire cover plate by hot melt. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a peripheral edging mold for a spare tire cover of an automobile and a control method thereof, wherein the automatic hot-melt edging of a reserved edging type is realized through the edging mold, and the edging effect is good and the consistency is high.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is to provide a peripheral edging mold for the spare tire cover of an automobile, comprising an upper mold and a lower mold, wherein the upper mold is arranged in an upper mold seat, and the lower mold is arranged in a lower mold seat, and the upper mold seat and the lower mold seat cooperate with each other. A pressing plate is connected to the cavity of the upper mold through a lifting mechanism, and a trimming knife is provided at the edge of the upper mold; a supporting plate is connected to the cavity of the lower mold through a lower pressure spring, and the supporting plate is arranged corresponding to the pressing plate, and an edging block is arranged at a position corresponding to the trimming knife in the lower mold, a transverse reserved cavity is provided on the inner side of the trimming knife, and a longitudinal edging cavity is provided on the inner side of the edging block.

[0005] Furthermore, the lifting mechanism includes an upper pressure spring and an edge-binding oil cylinder, wherein the upper pressure spring realizes the downward pressing of the pressing plate in the pre-pressing and forming stage, and the edge-binding oil cylinder realizes the downward pressing of the pressing plate in the edge-binding and forming stage.

[0006] Furthermore, a middle hole cutter is provided in the middle part of the upper die, and a middle hole edging support is provided in the lower die corresponding to the position of the middle hole cutter. A transverse reserved cavity is provided at the periphery of the blade of the middle hole cutter, and a longitudinal edging cavity is provided at the periphery of the middle hole edging support. Space is reserved at the periphery of the middle hole cutter and the middle hole edging support for relative movement with the pressing plate and the supporting plate.

[0007] Furthermore, the trimming knife and the edging block are connected to a heating device, the temperature of the trimming knife is 160-180°C, and the temperature of the edging block is 90-110°C; cooling pipes are provided in the pressing plate and the supporting plate, and the temperature of the pressing plate and the supporting plate is 20-40°C.

[0008] Furthermore, the installation gap between the pressing plate and the trimming knife is 0.45-0.55 mm, and the installation gap between the supporting plate and the edge binding block is 0.68-0.72 mm; the width of the edge binding cavity is 0.68-0.72 mm, and the height is 10-12 mm.

[0009] Furthermore, upper limit columns are provided at the four corners of the upper die base, and guide grooves are provided in the upper limit columns; lower limit columns are provided at the four corners of the lower die base, and guide columns matching the guide grooves are provided on the lower limit columns. The upper die base and the lower die base are guided and positioned by inserting the guide columns into the guide grooves, and are limited by the limit platform of the lower limit column.

[0010] Another technical solution adopted by the present invention to solve the above technical problems is to provide a control method for the outer peripheral edging mold of the spare tire cover plate of an automobile, which specifically includes the following steps: S1: placing the cover plate stock into a support plate; S2: heating the trimming knife and the edging block to a set temperature, connecting cooling water to the cooling pipes of the pressing plate and the support plate, and controlling the temperature of the pressing plate and the support plate to the set temperature; S3: controlling the upper die seat to press downward so that the pressing plate contacts the cover plate stock, and at this time the upper pressure spring and the lower pressure spring are in the initial position; S4: Control the upper die seat to continue pressing down, and keep it for 45 seconds after pre-pressing and forming; S5: Control the upper die seat to move up, and the trimming knife moves up with the upper die seat, the pressure plate keeps in contact with the cover plate, and the upper pressure spring returns to its initial position and keeps it for 10 seconds; S6: Control the upper die seat to continue pressing down, and control the hemming cylinder to push the pressure plate down, and keep it for 20 seconds after hemming and forming; S7: Control the upper die seat to move up, and under the elastic force of the lower pressure spring and the upper pressure spring, the support plate and the pressure plate return to their original positions, the hemming is completed, and the hemming product is taken out.

[0011] Furthermore, the pre-pressing molding in step S4 specifically includes: controlling the upper die seat to press down, the upper pressure spring is compressed, the pressing plate presses the cover plate stock, and the pressing plate and the cover plate stock do not move; the trimming knife moves downward with the upper die seat, contacts the edge of the cover plate stock for heating and melting, and then continues to press down until the edge of the trimming knife touches the upper surface of the edging block, and the excess waste area on the outside is cut off, and the trimming knife reserved cavity retains the edge area of ​​the corresponding cover plate stock as the corresponding reserved edging.

[0012] Furthermore, the edge forming in step S6 specifically includes: S61: controlling the upper die seat to press down, the upper pressure spring is compressed, the pressure plate presses the cover plate stock, and the pressure plate and the cover plate stock do not move; the trimming knife moves down with the upper die seat until the trimming knife blade touches the upper surface of the edge wrapping block, and the trimming knife reserved cavity contacts the reserved edge wrapping for heating and melting; S62: the edge wrapping cylinder in the upper die seat pushes the pressure plate to continue pressing down, the lower pressure spring in the support plate is compressed, and the cover plate stock moves down with the pressure plate and the support plate; S63: the heated and melted reserved edge wrapping flows into the edge wrapping cavity of the edge wrapping block for edge wrapping.

[0013] Furthermore, in step S2, the temperature of the trimming knife is controlled to be 170±10°C, the temperature of the hemming block is controlled to be 100±10°C; and the temperature of the pressing plate and the supporting plate is controlled to be 30±10°C.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the automobile spare tire cover outer periphery edging mold and the control method thereof provided by the present invention have the following advantages: 1. The material in the edging area is heated and melted before edging, and the surface flatness after edging is good; 2. The reserved edging area is cut by a trimming knife to ensure the uniformity of each position, which is conducive to achieving uniform thickness and consistency of flatness during edging, thereby ensuring the quality of edging; 3. An edging cavity is set, and the trimming knife is not in direct contact with the edging cavity, thereby ensuring that the edging material flows smoothly into the cavity, more effectively avoiding overflow, and ensuring the edging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the outer periphery hemming mold of the spare tire cover of the automobile in an embodiment of the present invention;

[0016] Figure 2 It is a side view of the outer periphery hemming mold of the spare tire cover of the automobile in the embodiment of the present invention after removing the upper mold base and the lower mold base;

[0017] Figure 3 It is a schematic diagram of the structure of the part that interacts with the cover plate preparation in an embodiment of the present invention;

[0018] Figure 4 It is an enlarged view of the edge hemming part of the outer periphery hemming mold of the spare tire cover of the automobile in the embodiment of the present invention;

[0019] Figure 5 It is an enlarged view of the hemming part of the middle hole of the hemming die for the outer periphery of the spare tire cover of the automobile in the embodiment of the present invention;

[0020] Figure 6 This is an enlarged view of the mold edge wrapping portion after pre-pressing in an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the material preparation structure of the cover plate after pre-pressing and forming in an embodiment of the present invention;

[0022] Figure 8 This is another structural schematic diagram of the preparation of the cover plate after pre-pressing and forming in an embodiment of the present invention;

[0023] Fig. 9 This is an enlarged view of the edge-wrapped portion of the mold after edge-wrapping in an embodiment of the present invention;

[0024] Fig.10 This is a schematic diagram of the material preparation structure of the cover plate after edge forming in an embodiment of the present invention;

[0025] Fig.11 It is another structural schematic diagram of the preparation of the cover plate after edge forming in an embodiment of the present invention.

[0026] In the figure:

[0027] 1. Upper die base; 2. Lower die base; 3. Upper die; 4. Lower die; 5. Pressing plate; 6. Trimming knife; 7. Supporting plate; 8. Edge-binding block; 9. Upper pressure spring; 10. Edge-binding cylinder; 11. Lower pressure spring; 12. Middle hole cutter; 13. Middle hole edge-binding support; 14. Upper limit column; 15. Lower limit column; 16. Guide column; 17. Limit table; 18. Cooling piping; 19. Cover plate preparation; 21. Reserved cavity; 22. Edge-binding cavity. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 This is a schematic diagram of the structure of the outer periphery hemming mold of the spare tire cover of the automobile in an embodiment of the present invention; Figure 2 It is a side view of the outer periphery hemming mold of the spare tire cover of the automobile in the embodiment of the present invention after the upper mold base and the lower mold base are removed.

[0030] See also Figure 1 and Figure 2 The peripheral edging mold of the spare tire cover of an automobile according to an embodiment of the present invention comprises an upper mold 3 and a lower mold 4. The upper mold 3 is arranged in an upper mold base 1, and the lower mold 4 is arranged in a lower mold base 2. The upper mold base 1 and the lower mold base 2 cooperate with each other. A pressing plate 5 is connected to the cavity of the upper mold 3 through a lifting mechanism, and a trimming knife 6 is provided at the edge of the upper mold 3; a supporting plate 7 is connected to the cavity of the lower mold 4 through a lower pressure spring 11, and the supporting plate 7 is arranged corresponding to the pressing plate 5. An edging block 8 is arranged at a position corresponding to the trimming knife 6 in the lower mold 4. The lifting mechanism comprises an upper pressure spring 9 and an edging cylinder 10. The upper pressure spring 9 realizes the downward pressing of the pressing plate 5 in the pre-pressing molding stage, and the edging cylinder 10 realizes the downward pressing of the pressing plate 5 in the edging molding stage.

[0031] Specifically, upper limit positioning columns 14 are provided at the four corners of the upper die base 1, and guide grooves are provided in the upper limit positioning columns 14; lower limit positioning columns 15 are provided at the four corners of the lower die base 2, and guide columns 16 matching the guide grooves are provided on the lower limit columns 15. The upper die base 1 and the lower die base 2 are inserted into the guide grooves through the guide columns 16 for guided positioning, and are limited by the limit platforms 17 of the lower limit columns 15.

[0032] Please also refer to 3. The peripheral edging mold for the spare tire cover of an automobile in an embodiment of the present invention has a cover with a middle hole. For the edging at the middle hole, a middle hole cutter 12 is provided in the middle part of the upper mold 3 corresponding to the middle hole of the cover, and a middle hole edging support 13 is provided on the lower mold 4 corresponding to the position of the middle hole cutter 12.

[0033] Please also refer to 4 , the peripheral edging mold of the spare tire cover of the automobile in the embodiment of the present invention, the inner side of the trimming knife 6 is provided with a transverse reserved cavity 21 , and the inner side of the edging block 8 is provided with a longitudinal edging cavity 22 .

[0034] Please also refer to 5, the peripheral edging mold of the spare tire cover of the automobile in the embodiment of the present invention, the outer periphery of the blade of the middle hole cutter 12 is provided with a horizontal reserved cavity 21, and the outer periphery of the middle hole edging support 13 is provided with a longitudinal edging cavity 22, and the outer peripheries of the middle hole cutter 12 and the middle hole edging support 13 are reserved with space for relative movement with the pressing plate 5 and the supporting plate 7.

[0035] Specifically, the trimming knife 6 and the edging block 8 are connected to a heating device, the temperature of the trimming knife 6 is 170±10°C, and the temperature of the edging block 8 is 100±10°C; the pressing plate 5 and the supporting plate 7 are provided with a cooling pipe 18, the temperature of the pressing plate 5 and the supporting plate 7 is 30±10°C. Since the trimming knife 6 and the edging block 8 are heated and melted, the temperature of the parts of the pressing plate 5 and the supporting plate 7 close to the trimming knife 6 and the edging block 8 will increase. The cooling pipe 18 is provided to control the temperature of the pressing plate 5 and the supporting plate 7, so that the main part of the cover plate preparation 19 will not be deformed due to the increase in temperature.

[0036] Specifically, the installation gap between the pressing plate 5 and the trimming knife 6 is 0.5±0.05mm, and the installation gap between the supporting plate 7 and the edging block 8 is 0.7±0.02mm; the width of the edging cavity 22 is 0.7±0.02mm, and the height is 10-12mm; the width and height of the reserved cavity are determined according to the actual design dimensions of the spare tire cover. Preferably, the width of the reserved cavity is 4mm and the height is 0.5mm.

[0037] The control method of the outer periphery hemming mold of the spare tire cover of the automobile according to the embodiment of the present invention specifically comprises the following steps:

[0038] S1: Place the cover plate stock 19 into the support plate 7;

[0039] S2: heating the trimming knife 6 and the hemming block 8 to a set temperature, connecting cooling water to the cooling pipes 18 of the pressing plate 5 and the supporting plate 7, and controlling the temperature of the pressing plate 5 and the supporting plate 7 to the set temperature;

[0040] The temperature of the trimming knife 6 is controlled to be 170±10°C, the temperature of the edge wrapping block 8 is controlled to be 100±10°C; the temperature of the pressing plate 5 and the supporting plate 7 is controlled to be 30±10°C.

[0041] S3: Control the upper die base 1 to press downward so that the pressing plate 5 contacts the cover plate stock 19. At this time, the upper pressure spring 9 and the lower pressure spring 11 are in the initial position;

[0042] S4: Control the upper die base 1 to continue pressing down, and keep pressing for 45 seconds after pre-pressing.

[0043] The upper die base 1 is controlled to be pressed down, the upper pressure spring 9 is compressed, the pressing plate 5 presses the cover plate stock 19, and the pressing plate 5 and the cover plate stock 19 do not move; the trimming knife 6 moves down with the upper die base 1, contacts with the edge of the cover plate stock 19 for heating and melting, and then continues to press down until the edge of the trimming knife 6 touches the upper surface of the hemming block 8, and the excess waste area on the outside is cut off, and the reserved cavity 21 of the trimming knife 6 reserves the corresponding edge area of ​​the cover plate stock 19 as the corresponding reserved hemming, such as Figure 6 As shown, after the cover plate preparation 19 and the reserved edge shape are completed, Figure 7 shown.

[0044] Figure 8 Another structural diagram of the pre-pressed rear cover plate preparation 19 is to adjust the shape of the reserved edge by adjusting the height difference between the support plate 7 and the edge block 8. If the height of the support plate 7 is equal to the height of the edge block 8, the shape of the reserved edge is as follows: Figure 7 As shown, if the height of the support plate 7 is lower than the height of the edge-binding block 8, the shape of the reserved edge is as follows: Figure 8 As shown, the height difference between the supporting plate 7 and the edge-wrapping block 8 is 0-3 mm.

[0045] S5: Control the upper die base 1 to move upward, the trimming knife 6 moves upward along with the upper die base 1, the pressing plate 5 keeps in contact with the cover plate stock 19, and the upper pressure spring 9 returns to the initial position and keeps in contact for 10 seconds;

[0046] S6: Control the upper die seat 1 to continue to press down, control the hemming cylinder 10 to push the press plate 5 down, and maintain for 20 seconds after the hemming is formed;

[0047] S61: Control the upper die holder 1 to be pressed down, the upper pressure spring 9 is compressed, the pressing plate 5 presses the cover plate stock 19, and the pressing plate 5 and the cover plate stock 19 do not move; the trimming knife 6 moves down with the upper die holder 1 until the edge of the trimming knife 6 touches the upper surface of the hemming block 8, and the reserved cavity 21 of the trimming knife 6 contacts the reserved hemming for heating and melting;

[0048] S62: The hemming cylinder 10 in the upper die base 1 pushes the pressing plate 5 to continue to press downward, the downward pressure spring 11 in the supporting plate 7 is compressed, and the cover plate preparation 19 moves downward with the pressing plate 5 and the supporting plate 7;

[0049] S63: The heated and molten reserved edge is flowed into the edge wrapping cavity 22 of the edge wrapping block 8 for edge wrapping. Fig. 9 As shown in the figure, if the height of the support plate 7 is equal to the height of the edge binding block 8, the edge binding shape of the cover plate preparation 19 after completion is as follows: Fig.10 As shown, corresponding to the pre-pressed Figure 7 If the height of the support plate 7 is lower than the height of the edging block 8, the edge of the cover plate 19 is completed. Fig.11 As shown, corresponding to the pre-pressed Figure 8 .

[0050] S7: Control the upper die seat 1 to move upward. Under the elastic force of the lower pressure spring 11 and the upper pressure spring 9, the support plate 7 and the pressure plate 5 return to their original positions. The hemming is completed and the hemming product is taken out.

[0051] In summary, the peripheral edging mold of the automobile spare tire cover and the control method thereof of the embodiment of the present invention heats the material in the edging area by heating and melting, and the surface flatness is good after edging; a trimming knife 6 is used to cut the reserved edging area to ensure the uniformity of each position, which is conducive to achieving uniform thickness and consistency of flatness during edging, thereby ensuring the quality of edging; an edging cavity 22 is set, and the trimming knife 6 is not in direct contact with the edging cavity 22, thereby ensuring that the edging material flows smoothly into the cavity, more effectively avoiding overflow, and ensuring the edging effect.

[0052] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. A peripheral edge wrapping mold for a spare tire cover plate of an automobile, characterized in that: It comprises an upper die and a lower die, wherein the upper die is arranged in an upper die seat, and the lower die is arranged in a lower die seat, and the upper die seat and the lower die seat cooperate with each other, a pressing plate is connected in the die cavity of the upper die through a lifting mechanism, and a trimming knife is arranged at the edge of the upper die; a supporting plate is connected in the die cavity of the lower die through a lower pressure spring, and the supporting plate is arranged corresponding to the pressing plate, and an edge wrapping block is arranged in the position corresponding to the trimming knife in the lower die, a transverse reserved cavity is arranged inside the trimming knife, and a longitudinal edge wrapping cavity is arranged inside the edge wrapping block; The lifting mechanism includes an upper pressure spring and an edge-wrapping oil cylinder. The upper pressure spring realizes the downward pressing of the pressing plate in the pre-pressing forming stage, and the edge-wrapping oil cylinder realizes the downward pressing of the pressing plate in the edge-wrapping forming stage. The trimming knife and the edge wrapping block are connected with a heating device, the temperature of the trimming knife is 160-180°C, and the temperature of the edge wrapping block is 90-110°C; the pressing plate and the supporting plate are provided with cooling pipes, and the temperature of the pressing plate and the supporting plate is 20-40°C; The installation clearance between the pressing plate and the trimming knife is 0.45-0.55 mm, and the installation clearance between the supporting plate and the edge binding block is 0.68-0.72 mm; the width of the edge binding cavity is 0.68-0.72 mm, and the height is 10-12 mm.

2. The outer periphery edge wrapping mold for the spare tire cover of the automobile according to claim 1, characterized in that: A middle hole cutter is provided in the middle of the upper die, and a middle hole edging support is provided on the lower die corresponding to the position of the middle hole cutter. A transverse reserved cavity is provided on the periphery of the blade of the middle hole cutter, and a longitudinal edging cavity is provided on the periphery of the middle hole edging support. Space is reserved on the periphery of the middle hole cutter and the middle hole edging support for relative movement with the pressing plate and the supporting plate.

3. The outer periphery edge wrapping mold for the spare tire cover of the automobile according to claim 1, characterized in that: The upper die base is provided with upper limit columns at the four corners, and guide grooves are provided in the upper limit columns; the lower die base is provided with lower limit columns at the four corners, and guide columns matching the guide grooves are provided on the lower limit columns. The upper die base and the lower die base are inserted into the guide grooves for guiding and positioning through the guide columns, and are limited by the limit platform of the lower limit column.

4. A control method for a peripheral edge wrapping mold of a spare tire cover plate of an automobile, characterized in that: The outer periphery hemming mold of the spare tire cover of the automobile as claimed in any one of claims 1 to 3 is used, and specifically comprises the following steps: S1: Place the cover plate material on the support plate; S2: Heat the trimming knife and the hemming block to a set temperature, connect cooling water to the cooling pipes of the pressing plate and the supporting plate, and control the temperature of the pressing plate and the supporting plate to the set temperature; S3: Control the upper die seat to press downward so that the pressing plate contacts the cover plate, and the upper pressure spring and the lower pressure spring are in the initial position; S4: Control the upper die to continue pressing down, and keep pressing for 45 seconds after pre-pressing. S5: Control the upper die seat to move upward, the trimming knife moves upward with the upper die seat, the pressing plate keeps in contact with the cover plate, and the upper pressure spring returns to the initial position and keeps for 10 seconds; S6: Control the upper die seat to continue to press down, control the hemming cylinder to push the press plate down, and maintain for 20 seconds after the hemming is formed; S7: Control the upper die seat to move upward. Under the elastic force of the lower pressure spring and the upper pressure spring, the support plate and the pressure plate return to their original positions. The hemming is completed and the hemming product is taken out.

5. The control method of the outer periphery edge wrapping mold of the spare tire cover of the automobile as claimed in claim 4, characterized in that: The pre-pressing molding in step S4 specifically includes: controlling the upper die seat to press down, the upper pressure spring is compressed, the pressing plate presses the cover plate stock, and the pressing plate and the cover plate stock do not move; the trimming knife moves downward with the upper die seat, contacts with the edge of the cover plate stock for heating and melting, and then continues to press down until the edge of the trimming knife touches the upper surface of the edging block, and the excess waste area on the outside is cut off, and the trimming knife reserved cavity retains the edge area of ​​the corresponding cover plate stock as the corresponding reserved edging.

6. The control method of the outer periphery hemming mold of the spare tire cover of the automobile as claimed in claim 4, characterized in that: The hemming forming in step S6 specifically includes: S61: Control the upper die seat to press down, the upper pressure spring is compressed, the pressing plate presses the cover plate stock, and the pressing plate and the cover plate stock do not move; the trimming knife moves down with the upper die seat until the edge of the trimming knife touches the upper surface of the hemming block, and the reserved cavity of the trimming knife contacts the reserved hemming to be heated and melted; S62: The hemming cylinder in the upper die seat pushes the pressing plate to continue pressing down, the lower pressure spring in the support plate is compressed, and the cover plate stock moves down with the pressing plate and the support plate; S63: The heated and molten reserved edge wrapping flows into the edge wrapping cavity of the edge wrapping block to perform edge wrapping.

7. The control method of the outer periphery edge wrapping mold of the spare tire cover of the automobile as claimed in claim 4, characterized in that: In step S2, the temperature of the trimming knife is controlled to be 170±10°C, the temperature of the edge wrapping block is controlled to be 100±10°C; and the temperature of the pressing plate and the supporting plate is controlled to be 30±10°C.

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