A lower die structure of a hot forming die for a rocker panel

Abstract

The application discloses a lower die structure of a threshold part hot forming die, belongs to the die field, solves the problem that the ejection mechanism of the hot forming die is stuck and cannot move after the ejection mechanism's top plate is pulled and injured, and the problem that the mechanical hand fails to pick up due to the product ejection deformation or unstable ejection posture derived from the closed area. In the application, the upper end surface of the lower die seat is provided with a top plate groove for accommodating the top plate, the forming punch has a product closed area forming part, the top plate groove and the product closed area forming part of the forming punch are arranged in a matched mode, the top plate is installed in the top plate groove and moves in the top plate groove; the top plate is connected with an ejection power mechanism, the ejection power mechanism is arranged in the lower die seat; the top plate and the forming punch have a gap; and a plurality of top plate hollow holes (13) are formed in the top plate. The lower die structure of the threshold part hot forming die can avoid the motion jam of the top plate and effectively prolong the service life of the ejection mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of threshold part hot forming die lower die structure, belong to mould field. BACKGROUND

[0002] The current ejection system in hot forming die mostly uses hydraulic cylinder, round ejector pin or ordinary ejector plate is connected at the end of piston rod, the product after forming is lifted to specified height by the movement of ejector pin or ejector plate, so that mechanical hand is conveniently grabbed and carried to the conveyor.

[0003] Because of the characteristics of large ejection resistance of closed and semi-closed parts, the product surface is easily pressed by using oil pressure ejector pin, and due to the irregular characteristics of parts, the resistance of each lifting position area is not the same, so there is also the situation that the force of ejector pin is not balanced, the force of ejector pin does not completely coincide with the axis, and the phenomena of bending deformation, pulling injury and movement jam are easy to appear.

[0004] Although the deformation situation can be avoided by using ordinary ejector plate mechanism to lift the parts, the contact area between the mold workpiece is increased, the coating debris on the surface of the plate is entered into the gap between the ejector plate and the workpiece in the continuous production of the mold, which also causes the phenomena of ejector plate pulling injury and movement jam, in addition, the unbalanced ejection force always exists, and the increase of the contact length between the ejector plate and the parts will aggravate the unbalanced force condition, thereby causing the leakage of oil cylinder piston seal.

[0005] The impact inertia of the ordinary ejector plate assembly is usually large, and the ordinary ejector mechanism does not have a limiting device, so when the piston returns, it will hit the bottom of the oil cylinder with large inertia, and the service life of the oil cylinder is short. SUMMARY

[0006] In view of the problems of the existing technology that the ejector plate of the ejection mechanism in hot forming die is pulled and stuck after the deformation of the product with closed area or the unstable ejection posture derived from the failure of mechanical hand grabbing, the present application provides a kind of threshold part hot forming die lower die structure, which avoids the movement jam of the ejector plate and effectively improves the service life of the ejection mechanism.

[0007] The technical scheme adopted by the present application is a kind of threshold part hot forming die lower die structure, which comprises a lower die seat, and the upper end of the lower die seat has a forming punch;

[0008] The threshold part hot forming die lower die structure further comprises an ejector plate; the upper end surface of the lower die seat is provided with an ejector plate groove for accommodating the ejector plate, the forming punch has a product closed area forming part, the ejector plate groove and the product closed area forming part of the forming punch are matched, the ejector plate is installed in the ejector plate groove and moves in the ejector plate groove; the ejector plate is connected with an ejection power mechanism, and the ejection power mechanism is arranged in the lower die seat;

[0009] The top plate has a gap between the top plate and the forming punch; the top plate is provided with a plurality of top plate hollow holes.

[0010] The optimized lower die structure of the hot forming die for the threshold part is provided with a ejector pin, the upper end surface of the lower die seat is provided with a ejector pin groove for accommodating the ejector pin, the forming punch has a product opening area forming part, the ejector pin groove is matched with the product opening area forming part of the forming punch, the ejector pin is installed in the ejector pin groove and moves in the ejector pin groove; the lower end of the ejector pin is connected with a ejector pin power mechanism and the lower end of the ejector pin is connected with the power output end of the ejector pin power mechanism.

[0011] The optimized lower die structure of the hot forming die for the threshold part is provided with a ejector pin, the upper end surface of the lower die seat is provided with a ejector pin groove for accommodating the ejector pin, the forming punch has a product opening area forming part, the ejector pin groove is matched with the product opening area forming part of the forming punch, the ejector pin is installed in the ejector pin groove and moves in the ejector pin groove; the lower end of the ejector pin is connected with a ejector pin power mechanism and the lower end of the ejector pin is connected with the power output end of the ejector pin power mechanism.

[0012] The lower die seat is provided with a forming punch backing plate, the forming punch backing plate is located below the forming punch and is fixed with the lower die seat;

[0013] After the top plate is lifted to the maximum height by the ejector power mechanism, the top plate backing plate is attached to the lower end of the forming punch backing plate.

[0014] The optimized lower die structure of the hot forming die for the threshold part is provided with a ejector pin, the upper end surface of the lower die seat is provided with a ejector pin groove for accommodating the ejector pin, the forming punch has a product opening area forming part, the ejector pin groove is matched with the product opening area forming part of the forming punch, the ejector pin is installed in the ejector pin groove and moves in the ejector pin groove; the lower end of the ejector pin is connected with a ejector pin power mechanism and the lower end of the ejector pin is connected with the power output end of the ejector pin power mechanism.

[0015] The optimized lower die structure of the hot forming die for the threshold part is further provided with a limiting block, the limiting block is installed on the side of the ejector power mechanism; after the top plate slides in the top plate groove and the ejecting end of the top plate is flush with the forming surface of the forming punch, the top plate backing plate is attached to the top end surface of the limiting block.

[0016] The optimized lower die structure of the hot forming die for the threshold part is further provided with a guide column and a guide column fixing seat; the guide column fixing seat is fixed on the side of the ejector power mechanism, the guide column is installed on the top end of the guide column fixing seat; the top plate backing plate is provided with a guide hole matched with the guide column, the guide column is inserted into the guide hole and is in sliding contact with the guide hole.

[0017] The optimized lower die structure of the hot forming die for the threshold part is further provided with a guide column and a guide column fixing seat; the guide column fixing seat is fixed on the side of the ejector power mechanism, the guide column is installed on the top end of the guide column fixing seat; the top plate backing plate is provided with a guide hole matched with the guide column, the guide column is inserted into the guide hole and is in sliding contact with the guide hole.

[0018] The optimized lower die structure of the hot forming die for the threshold part is further provided with a guide column and a guide column fixing seat; the guide column fixing seat is fixed on the side of the ejector power mechanism, the guide column is installed on the top end of the guide column fixing seat; the top plate backing plate is provided with a guide hole matched with the guide column, the guide column is inserted into the guide hole and is in sliding contact with the guide hole.

[0019] The optimized lower die structure of the hot forming die for the threshold part has at least two ejector pins, and the ejector pins are arranged at intervals between the product opening area forming portions of the forming punch.

[0020] The optimized lower die structure of the hot forming die for the threshold part has a top plate, and the upper end surface of the top plate is a lifting end surface, and the shape of the lifting end surface of the top plate is matched with the surface shape of the product closed area forming portion of the forming punch.

[0021] The application has the following advantages:

[0022] In the technical solution of the application, the top plate is designed with a plurality of hollow holes for accommodating debris, and the debris is shaken and falls outside the lower die seat when the top plate mechanism is retracted and suddenly stopped, so that the debris is removed, and the situation that the top plate is damaged and stuck after being pulled is effectively reduced.

[0023] In the technical solution of the application, the inertia of the ejection mechanism is large, and the ejection mechanism is designed to be retracted and limited, so that the piston directly impacts the bottom of the oil cylinder is avoided, thereby avoiding a series of problems such as deformation of the piston rod, leakage of the piston seal, and improving the service life of the oil cylinder.

[0024] In the technical solution of the application, the guide sleeve and guide column group are used to increase the motion guide control of the ejection mechanism, which greatly reduces the problem of premature failure of the oil cylinder seal. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The figure is a structural schematic diagram of the application;

[0026] Figure 2 The figure is a structural schematic diagram of the lower die before the threshold part is lifted in the application;

[0027] Figure 3 The figure is a structural schematic diagram of the lower die after the threshold part is lifted in the application;

[0028] Figure 4 The figure is Figure 2 the N-N sectional view;

[0029] Figure 5 The figure is a structural schematic diagram of the oil pressure top plate mechanism in the application;

[0030] Figure 6 The figure is a structural schematic diagram of the threshold part in the application

[0031] Figure 7 The figure is a structural schematic diagram of the ejector pin ejection mechanism in the application. DETAILED DESCRIPTION

[0032] The technical features of the application will be further described below in combination with the drawings and specific embodiments.

[0033] As shown in the figure, the present application is a kind of threshold part hot forming die lower die structure, including lower die seat 7, top plate 6, ejector pin 11, lower die seat 7 upper end has forming punch 2.Product structure as shown in the figure, wherein 12-1 is product closed area, 12-2 is product open area.

[0034] The upper end surface of the lower die seat 7 is provided with a top plate groove for accommodating the top plate 6, and the forming punch 2 has a product closed area forming part. The top plate groove is matched with the product closed area forming part of the forming punch 2, and the top plate 6 is installed in the top plate groove and moves in the top plate groove.

[0035] The upper end surface of the lower die seat 7 is provided with a top plate groove for accommodating the top plate 6, and the forming punch 2 has a product closed area forming part. The top plate groove is matched with the product closed area forming part of the forming punch 2, and the top plate 6 is installed in the top plate groove and moves in the top plate groove.

[0036] The moving power of the top plate 6 is supplied by the ejection power mechanism. In this embodiment, the ejection power mechanism uses oil cylinder 15 as the power mechanism, and a cavity is built in the lower die seat 7 to install the oil cylinder 15.

[0037] The moving power of the ejector pin 11 is supplied by the ejector pin power mechanism. In this embodiment, the ejector pin power mechanism uses oil cylinder 25 as the power mechanism. A cavity is built in the lower die seat 7 to install the oil cylinder 25.

[0038] One side of the lower die seat 7 is provided with an oil way interface 8, and the oil way interface 8 is connected with a lifting oil way 9 and a back-off oil way 10. The oil cylinder 15 and the oil cylinder 25 are connected with the lifting oil way 9 and the back-off oil way 10, and the piston rod of the oil cylinder 15 and the oil cylinder 25 is provided with the power of lifting and retracting by the lifting oil way 9 and the back-off oil way 10.

[0039] In this embodiment, there is a gap between the top plate 6 and the forming punch 2. A plurality of top plate hollow holes 13 are built on the top plate 6. The top plate 6 moves up and down in the forming punch 2 with the forming frequency, and the detached coating debris enters the gap between the two. Since the top plate 6 adopts a design of multiple hollow holes for accommodating debris, the dust is shaken off when the top plate 6 mechanism is back off and stopped suddenly, achieving the purpose of removing debris and directly avoiding the problem of top plate being pulled and stuck.

[0040] After using the hollow top plate design, the action coordination of the top plate 6 and the ejector pin 11 is good, the ejection force is consistent, the deformation problem caused by inconsistent ejection force of the parts is eliminated, the attitude of the parts after lifting is quite stable, the success rate of mechanical hand grabbing is greatly improved, and the production efficiency is effectively improved.

[0041] The power output end of the ejection power mechanism, i.e. the piston end of the oil cylinder 15, is connected with a top plate base plate 17 through a piston connecting rod 16, and the top plate 6 is fixed on the top plate base plate 17 through a top plate connecting plate 21. The lower die seat 7 is provided with a forming punch base plate 4 below the forming punch 2 and fixed with the lower die seat 7. The forming punch 2 is fixed with the forming punch base plate 4. After the top plate 6 is lifted to the maximum height by the ejection power mechanism, the top plate base plate 17 is attached to the lower end of the forming punch base plate 4.

[0042] The lower end of the ejector pin 11 is attached with an ejector pin fixed plate 14 between the power output end of the ejector pin power mechanism. After the ejector pin 11 is lifted to the maximum height by the ejector pin power mechanism, the ejector pin fixed plate 14 is attached to the lower end of the forming punch base plate 4.

[0043] Due to the large inertia of the ejection mechanism, the above-mentioned limiting design avoids the impact of the piston and reduces the possibility of deformation of the piston rod, thereby improving the service life of the oil cylinder.

[0044] The limiting block 22 is installed on the side of the ejection power mechanism. After the top plate 6 slides in the top plate groove and the ejection end of the top plate 6 is flush with the forming surface of the forming punch 2, the top plate base plate 17 is attached to the top end surface of the limiting block 22.

[0045] The guide column fixed seat 20 is fixed on the side of the ejection power mechanism, and the guide column 19 is installed on the top end of the guide column fixed seat 20. The top plate base plate 17 is provided with a guide hole matched with the guide column 19, and a guide sleeve 18 is sleeved in the guide hole. The guide column 19 is inserted into the guide sleeve 18 and in sliding contact with the guide sleeve 18.

[0046] Due to the complex shape of the parts, the two ends of the top plate are inclined at a small angle due to uneven force, which makes the piston rod of the oil cylinder 15 easily damaged by eccentric force. The guide design is adopted for the movement of the ejection mechanism, and the guide sleeve 18 and the guide column 19 are used to increase the guide control of the ejection mechanism, which greatly reduces the problem of premature failure of the oil cylinder 15 seal.

[0047] After the top plate 6 slides in the top plate groove and the ejection end of the top plate 6 is flush with the forming surface of the forming punch 2, the top plate base plate 17 is attached to the top end surface of the guide column fixed seat 20.

[0048] Due to the large inertia of the ejection mechanism, the ejection mechanism retreat limiting design is adopted, which avoids the direct impact of the piston on the bottom of the oil cylinder. Frequent impact of the piston on the cylinder can easily cause deformation of the piston rod, leakage of the piston seal and a series of problems, thereby improving the service life of the oil cylinder.

[0049] The guide column group two 23 is fixed in the lower die seat 7. The guide column group two 23 of this embodiment has two guide columns two, and the ejector pin fixed plate 14 is provided with two guide column holes matched with the two guide columns two. The two guide columns two pass through the two guide column holes respectively and are in sliding contact with the guide column holes.

[0050] The ejector pins 11 are arranged at least in two, and are arranged at intervals between the product opening area forming part of the forming punch 2.

[0051] The upper end surface of the ejector plate 6 is an ejecting end surface, and the shape of the ejecting end surface of the ejector plate 6 is arranged in cooperation with the surface shape of the product closing area forming part of the forming punch 2.

[0052] In this embodiment, the hot blank starts forming until the end, and the action sequence of the oil pressure ejection system is as follows: the ejection mechanism is stationary at the lower limit position to start forming - the ejection mechanism is stationary at the lower limit position after forming is completed, the upper die is opened - the ejection mechanism lifts the product to the upper limit position, the upper die is opened to the specified height - the ejection mechanism falls to the lower limit position, the mechanical hand grabs the product and carries it out of the mold, and enters the next feeding and forming cycle.

[0053] As shown in Figure 1 and Figure 2 , after the hot blank 1 is put into the outer positioning 3 above the lower die seat 7, the upper die starts forming downward, and the ejector plate 6 and the ejector pins 11 are at the lower limit position, flush with the surface of the forming punch 2.

[0054] After forming is completed, the upper die goes up and separates from the lower die, at this time the product 12 side wall tightly holds on the forming punch 2, due to the friction and the effect of product cooling shrinkage, the lifting resistance in the product closing area is much larger than that in the opening area, therefore the design of ejector plate-closing area and ejector pin-opening area is adopted to ensure smooth lifting of the product.

[0055] As shown in Figure 3 , after the upper die is opened to the specified height, the oil way interface 8 switches to the lifting oil way 9 to work, the piston of the oil cylinder 15 is lifted, the piston connecting rod 16, the ejector plate backing plate 17, the ejector plate connecting plate 21 and the ejector plate 6 go up until the ejector plate backing plate 17 reaches the forming punch backing plate 4, that is, the upper limit position. The connection mode of the ejector plate backing plate 17 and the ejector plate connecting plate 21, the ejector plate 6 and the ejector plate connecting plate 21 is all fixed by screws. Similarly, the ejector pin fixing plate 14 and the ejector pin 11 complete the lifting action under the pushing of the oil cylinder piston.

[0056] After the mechanical hand shown in the figure carries out the product out of the mold, the return oil way 10 starts to work, the ejector pin 11 and the ejector plate 6 return under the driving of the oil pressure until the ejector plate backing plate 17 retreats to the guide column fixing seat 20 and the limiting block 22, the ejector plate 6 and the ejector pin 11 are just flush with the surface of the forming punch 2, that is, the lower limit position, waiting for the mechanical hand to put in the new hot blank, and entering the next production cycle.

[0057] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Within the scope of the present application, changes, modifications, additions or replacements made by ordinary skilled in the art should all belong to the protection scope of the present application.

Claims

1. A lower die structure of a rocker panel part hot forming die, comprising a lower die base (7), the upper end of the lower die base (7) being provided with a forming punch (2); characterized in that: a top plate (6) is further included; the upper end surface of the lower die base (7) is provided with a top plate groove accommodating the top plate (6), the forming punch (2) is provided with a product closed area forming part, the top plate groove is arranged in cooperation with the product closed area forming part of the forming punch (2), the top plate (6) is installed in and moves in the top plate groove; the top plate (6) is connected with an ejection power mechanism, the ejection power mechanism is arranged in the lower die base (7); a gap is formed between the top plate (6) and the forming punch (2); a plurality of top plate hollow holes (13) are formed on the top plate (6); the lower die base (7) is connected with an ejector pin (11), the upper end surface of the lower die base (7) is provided with an ejector pin groove accommodating the ejector pin (11), the forming punch (2) is provided with a product opening area forming part, the ejector pin groove is arranged in cooperation with the product opening area forming part of the forming punch (2), the ejector pin (11) is installed in and moves in the ejector pin groove; the lower end of the ejector pin (11) is connected with an ejector pin power mechanism, and the lower end of the ejector pin (11) is connected with the power output end of the ejector pin power mechanism. the power output end of the ejection power mechanism is connected with a top plate backing plate (17), and the top plate (6) is fixed on the top plate backing plate (17); 2. The running board part hot stamping die lower mold structure according to claim 1, characterized by: the lower die base (7) is provided with a forming punch backing plate (4), the forming punch backing plate (4) is located below the forming punch (2) and is fixed with the lower die base (7); after the top plate (6) is lifted to the maximum height by the ejection power mechanism, the top plate backing plate (17) is attached to the lower end of the forming punch backing plate (4). a top pin fixing plate (14) is arranged between the lower end of the ejector pin (11) and the power output end of the ejector pin power mechanism; after the ejector pin (11) is lifted to the maximum height by the ejector pin power mechanism, the top pin fixing plate (14) is attached to the lower end of the forming punch backing plate (4).

3. The running board part hot stamping die lower mold structure according to claim 2, characterized by: a limiting block (22) is further included, the limiting block (22) is installed on the side of the ejection power mechanism; after the top plate (6) slides in the top plate groove and the ejection end of the top plate (6) is flush with the forming surface of the forming punch (2), the top plate backing plate (17) is attached to the top end surface of the limiting block (22).

4. The running board part hot stamping die lower mold structure according to claim 2, characterized by: a guide column (19) and a guide column fixing seat (20) are further included; the guide column fixing seat (20) is fixed on the side of the ejection power mechanism, and the guide column (19) is installed on the top end of the guide column fixing seat (20); the top plate backing plate (17) is provided with a guide hole arranged in cooperation with the guide column (19), the guide column (19) is inserted into the guide hole and in sliding contact with the guide hole.

5. The running board part hot stamping die lower mold structure of claim 2, characterized by: after the top plate (6) slides in the top plate groove and the ejection end of the top plate (6) is flush with the forming surface of the forming punch (2), the top plate backing plate (17) is attached to the top end surface of the guide column fixing seat (20).

6. The running board part hot stamping die lower mold structure according to claim 5, characterized by: a second guide column group (23) is further included, the second guide column group (23) is fixed in the lower die base (7), the top pin fixing plate (14) is provided with a guide column hole arranged in cooperation with the second guide column group (23), the second guide column group (23) passes through the guide column hole and is in sliding contact with the guide column hole.

7. The running board part hot stamping die lower mold structure of claim 3, characterized by: ​ 8. The rocker part hot stamping die lower mold structure of claim 1, wherein: The ejector pins (11) are at least two, and are arranged at intervals in the product opening area forming part of the forming punch (2).

9. The rocker part hot stamping die lower mold structure of claim 1, wherein: The upper end surface of the top plate (6) is a jacking end surface, and the jacking end surface of the top plate (6) is arranged in cooperation with the surface shape of the product closing area forming part of the forming punch (2).

Images