JPS63194826A - Panel press method and its device - Google Patents

Abstract

PURPOSE:To increase an elongation amt. without causing a strain on a panel and to improve the toughness of the panel by holding the panel in the state of giving a tension in one direction and pressing the panel with a double action method in the other direction crossing therewith. CONSTITUTION:A panel 1 is transferred between the upper die 2 and lower die 3 of a press, an upper blank holder 5 is descended by a 2nd vertical moving mechanism 7, the panel 1 is held at a holding part A in one direction of the panel 1 and transferred to the panel spreading state with its nonholding state at the holding part in the other direction. Namely the upper die 2 is descended by working a 1st vertical moving mechanism 4 in this state to press the panel 1 by pressing faces 2a, 3a. Since the elongation from two directions is given on the center part of the shape of the panel 1 the toughness is thus increased up and the material cost is reduced because of the plate thickness against the same toughness being reduced as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a panel pressing method and apparatus, and particularly to a pressing method and apparatus suitable for use in panels such as doors and trunk lids.

[Conventional technology]

Conventionally, as shown in Fig. f:tS8 (a), panel press equipment using the single action construction method (air draw construction method) has a rectangular upper die (Gui) that is a pre-large panel of 1゛.
2' and a lower die (punch) 3', a vertical movable blade 4' that moves the upper die 2' up and down, a gripping surface 2°b formed around the press surface 2'a of the upper die 2', A rectangular frame-shaped blank holder 5' arranged to surround the lower mold 3' and movable up and down relative to the lower mold 3', and a blank holder 5' that comes into contact with the gripping surface 2'b of the upper mold 2'. Jlli 5'a of the blank holder 5' which can grip the panel 1' by holding the panel 1', and maintaining the height of the gripping surface 5'a at a height substantially in line with the pressing surface 3'a of the lower die 3' when carrying the panel; , Kushitan Isotoru 6' which functions as a shoe scene when the blank holder 5' is lowered.
It is made up of grooves.

Note that the cross section shown in FIG. 8(a) is formed in the mD plane and the vertical cross section, and the gripping surface 5'a is formed over the entire circumference. Below NI#6', an unillustrated ef-silling or the like is provided.

In such a single-action panel press device, as shown in Figures I:lS8 (a) to (c),
The panel 1' is pressed by pressing down the upper mold 2' by the vertically movable rocker 4'.

[Point χ to be solved by the invention] However, with such conventional panel pressing means, the entire circumference of the panel 1 is gripped, so when performing rough pressing, increasing the gripping force may cause the shape to change. ! 4 Reasons apply,
If the gripping force is weakened, there is a problem that wrinkles will occur in a part of the panel 1.

Furthermore, with conventional panel press means,
As shown, the drawing depth from the blank holder surface BH! There is a problem that the yield of the press-formed product 1' is poor because there is no inflow of material.

As shown in FIG. 6 (IJ), since the 70-ton door outer 1''A as the pressed rat-shaped product 1' is only slightly elongated, the η9 property is not thick, and therefore the There is a problem.

The present invention aims to solve this problem, -χ, by increasing the amount of elongation and improving the rigidity of the panel as a press-formed product without causing distortion in the panel. Purpose D is to provide a panel press force method and its device 6 [Means for solving the problem] Therefore, the panel press force method of the present invention uses the stretch draw method to tension the panel ↓ toward the worker. In the given state, press the panel against one side of the press die to blend it in, and then press the panel against one side of the large press using the double axis polishing method in another direction intersecting with the one direction above. The method is characterized in that the panel is pressed by closing one and the other of the press molds.

In addition, the panel press 1ira of the present invention includes an upper mold and a lower mold for pressing with a spring tL4, and a first vertical movement 8! that vertically moves at least one of the upper mold and the lower mold. a structure, an upper blank holder and a lower blank holder that are arranged to surround the upper and lower molds and are movable up and down, and at least one of the upper blank holder and the lower blank holder can be moved up and down! l1l
the upper blank holder and the lower blank holder are each formed with a gripping surface for gripping only the pair of opposing edges of the panel, and The vf feature is that a holding surface for pressing and holding the panel against the holding surface of the upper blank holder is formed on the stepped portion connected to the press surface.

[For production]

In the above-described panel pressing method of the present invention, the panel is pressed against a lower die, which is one of the press dies, with tension applied in a predetermined direction by the stretch draw method, and then the panel is pressed in a direction perpendicular to the predetermined direction. The panel is pressed and held against the lower die of the press die using the double axis method, and the panel is pressed using the upper die and the lower die of the press die.

In the above-described panel press apparatus of the present invention, the panel is placed on the lower die and the upper blank holder is pushed down by the second vertically movable rock structure, thereby separating the gripping surface of the upper blank holder and the gripping surface of the lower blank holder. Grasp the pair of opposing edges of the panel with the and, release the other kk part, and then hold the second upper and lower parts! +! The IJ mechanism pushes down the upper blank holder further,
Press and hold the panel between the holding surface of the upper blank holder and the holding surface of the stepped part connected to the lower mold, and in this state
Pressing of the panel is performed by operating the vertical movement of the machine.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
Figures i1 to 7 show a panel press method as an embodiment of the present invention and a panel press apparatus for directly carrying out the method. In Figures 1 to 7, the same symbols as in Figure 8 are almost the same. Show things.

As shown in Figure 1 (2I(a), second chisel) and Figure 3, the panel press device consists of a rectangular upper die (Gui) 2 and a lower die (punch) 3, which serve as the press die for the panel 1. ,
A first vertical movable rock groove 4 for vertically moving the upper mold 2; and a rectangular frame-shaped upper blank holder arranged to surround the upper mold 2 and movable vertically relative to the upper mold 2. 5, a rectangular frame-shaped lower blank holder 6 arranged to surround the lower mold 3 and movable vertically relative to the lower mold 3, and a second blank holder 6 for vertically moving the upper blank holder 5. Vertical movement (grasping surface 6 of lower blank holder 6 when loading the panel)
The height of b is maintained at a height that substantially follows the press surface 3a of the lower die 3, and the lower blank holder 6 functions as a cushion when the lower blank holder 6 is lowered.

In addition, the lower die 3 is formed with a holding surface 3b that holds the edge 11 of the panel 1 between the lower surface 5a of the upper blank holder 5 and the lower surface 5a of the upper blank holder 5 at a 12 portion connected to the press surface 3a. 3b are formed on a pair of opposing sides around the press surface 3a.

The upper blank holder 5 is formed into a rectangular frame shape, and a pair of opposing sides of the lower surface 5a of the upper blank holder 5 are provided with gripping portions A as shown in FIG. A gripping surface (wrinkle pressing surface) 51 for gripping a pair of opposing edges 1a of the panel 1 with a gripping surface 6b of the lower blank holder 6 is formed, and an upper blank holding surface 51 is formed for gripping the pair of opposing edges 1a of the panel 1. On the opposite side of the pond, there are
, ), a holding surface 5c is formed to hold the pair of opposing edges 11) of the panel 1, which holds the holding portion B, between the holding surface 3b of the lower mold 3.

The gripping surface 51] and the holding surface 5c have flat or curved shapes along the gripping surface 6b and the holding surface 3b, respectively.

Further, the lower blank holder 6 is formed in a rectangular frame shape, and the upper surface 6a of the lower blank holder 6 is connected to the edge 1a of the panel 1 between the upper surface 6a and the gripping surface 5a of the upper blank holder 5.
The pair of gripping surfaces 6b of the lower blank holder 6 for gripping are connected to both ends of the gripping surfaces 6b of the lower blank holder 6, and in the gripping state of the upper and lower blank holders 5.6, the upper blank holder 5. A non-gripping surface (non-contact surface) 6c is disposed a predetermined distance downward from the holding surface 5c of the gripping surface 5.

Since the spring press device for directly carrying out the panel press force method as an embodiment of the present invention has been purchased as described above, in the panel carrying state shown in FIGS. 1(a) and 2(a), Between the upper die 2 and the lower die 3 of the press; the panel 1 is carried in, and then the panel 4m inserted state shifts to the panel gripping state shown in Fig. 1 (1)) and Fig. 2 (IJ). , the upper blank holder 5 is lowered by the second vertical movement mechanism 7, and the panel 1 is gripped by the gripping portion in one direction of the panel 1. In this gripping state, the holding portion B of the panel 1 in the pond direction
is in a non-retained state.

Then, while maintaining the gripping state of the panel 1, the first
Figure (c) and Figure 2 (c) show the na panel offshore state.
will be migrated.

In other words, in this panel extension state, the second vertical motion is 7.
The upper blank holder 5 is further lowered so that the contact surface 6d of the lower blank holder 6 contacts (or approaches) the contact surface 3c of the lower mold 3, and the upper blank holder 5 The holding portion 5c is brought into contact with the holding surface 31) of the lower mold 3. At this time, the contact surface 3 is
The contact between c and 6d is done slowly.

As a result, in this panel extended state, the panel 1 stretches in the direction indicated by the symbol F in FIG. j.

available.

Next, in this panel extended state, the panel 1 that has been adapted to the press surface 3a is placed in the first L (d) and the second (d)
) is transferred to the press state shown in FIG.

That is, in this pressing state, the upper mold 2 is lowered by the first vertically movable grating 4, the pressing surfaces 2a and 3a are aligned and closed, and the pressing of the panel 1 is completed.

In this way, in one direction, the double action construction method gives the panel 1 elongation, and in the other direction, the stretch draw method gives the panel 1 elongation.

According to this embodiment described above, the central part of the panel 1 is given elongation from two planes, which increases the rigidity and reduces the board thickness by 1 for the same rigidity, reducing material costs. do.

Moreover, since the rigidity of the central portion of the panel 1 is high, the shape fixability is high even in a shape with a large curvature, contributing to the creation of a flush surface.

As shown in FIG. 4, when comparing the shapes after molding, the stretch draw method has a good yield because it makes the aperture R3H shallow and there is no inflow of material.

That is, the drawing depth to t from the blank holder surface B [12 in the conventional single action method [Fig. 5 (I
Since the depth H (see Fig. 5 (n)) from the blank holder surface B)-1 in the stretch draw construction method of this example is shallower than that of The length I21 in one direction in the example is also smaller than the length p in the conventional example.

In the stretch draw method of this embodiment, the outer pressure of the second vertical movement mechanism 7 of the upper blank holder 5 and the cushion pressure of the kungjong mechanism 8 of the lower blank holder 6 are used to prevent the material from flowing in until the end of forming. The panel 1 is completely fixed, and the press-formed panel 1 is raised higher than the blank holder surface BH at its center and lowered than the blank holder surface BH at its periphery.

In this way, the pressure at the gripping part A is strong, and as shown in FIG.
) can also be made smaller than in the conventional construction method.

Furthermore, this example was applied to a vehicle door (70 door outer).
In the experimental example applied to
〆100m+a) In the conventional method shown in Fig. 6 (11), the four corners of 1ζA 1'A are only slightly elongated, whereas in this embodiment shown in Fig. 6 (a). With the trench draw construction method, the entire door IA is elongated almost on average, resulting in increased rigidity, greater strain resistance (and improved yield).

In addition, the rigidity of the door middle part after forming for door IA, 1"A is Tr, the plate thickness of the conventional method shown in Figure 7 (IJ) (
The plate thickness (0.7t) of the stretch draw method shown in Figure 7(a) is 0.05m+n +8
．． )' are equivalent despite the decrease in I-.

The numbers in Figure 17 (a) and (+3) are 300 + on one side.
It shows '2ffl (+11111) when a load of 1 kHz is applied to the center of an equilateral triangle of n + n.

Note that after gripping the pair of opposing sides 1a of the panel 1,
Stretch the lower mold 3 in one direction, then,
If the panel 1 is stretched in one direction by gripping the other pair of sides 1b of the panel 1 and then pushing the lower die 3 in the other direction, the panel 1 can be stretched in one direction. It is not limited to things.

Therefore, the blank holder may be manufactured by a double action method using a blank holder that is separated from one direction and the other direction.

Further, as a blank holder, a frame body having a pair of gripping portions in one direction, and a pair of gripping portions supported on the frame body via a buffer mechanism and arranged in the other direction may also be used. good. In this case, it works as a single construction method in one direction and in the other direction.

〔Effect of the invention〕

As described in detail above, according to the panel pressing method of the present invention, since the panel is stretched in only one direction at a time while gripping a pair of opposing sides of the panel, it is possible to realize a complex panel shape and to This has the advantage of preventing distortion from occurring and increasing rigidity since the central portion of the panel shape can be stretched from two sides.

In addition, by using the panel press W:Q of the present invention, in addition to the effects and advantages of the above-mentioned methods, the medium heat portion of the panel shape is given elongation from two sides, increasing the rigidity. Since the plate 17 for the same rigidity can be reduced and the depth of the curvature from the blank holder surface can be made shallower, the yield is improved and the material cost is thereby reduced.

[Brief explanation of the drawing]

Figures 1 to 7 show a panel press method as an embodiment of the present invention and a panel press apparatus for directly carrying out the method, and Figures 1 (a) to (a) show the stretch draw method. The third diagram force I-r to explain the action of
Figures 2 (a) to (d) are cross-sectional views taken along arrows 1 and 2 in Figure 3 to explain the action of the double action method, and Figure 3 shows the lower part of the press equipment. A perspective view showing,
Figure rPS4 is a sectional view comparing the shapes after pressing, Figures 5(a) and 5(b) are sectional views of the present embodiment and the conventional device, respectively showing enlarged portions V in Figure 4. Figure 6 (a
) and (b) are 5! by this method and the conventional method, respectively.
! Explanatory diagram showing the extension of the left door, Figure 7 (a),
(b) is an explanatory diagram showing the rigidity of doors manufactured by the present method and the conventional method, respectively, and FIGS. 8(a) to (e)
) are two-dimensional diagrams for explaining the operation of the device used in the single-action construction method, which is a conventional panel press method. 1...Spring 7 1a, lb...Swing part, IA...Door, 2...Upper die (Gui), 2a...Press surface, 3...Lower die (punch), 3a...Press surface, 3) 3...Holding surface, 3
c...Abutting surface, 4...First vertical movement (movement structure, 5...Upper blank holder, 5a...Lower surface, 51)...Gripping surface, 5
c: Holding surface, 6: Lower blank hole, 6a: Upper surface, 6b: Gripping surface, 6c: Non-contact surface, 6d: Contact surface, 7: Second vertical movement 811 Plain sound , 8... Kunonyon (1 dry, 9... bead, t\... gripping part, B... holding part, [3H,, Bi12... blank holder surface.

Claims (2)

[Claims] (1) Press the panel against one side of the press mold using the stretch draw method to apply tension in one direction, and then apply the panel to the press mold using the double action method in the other direction that intersects with the one direction. A method for pressing a panel, comprising: closing one and the other of the press molds while pressing and holding the panel against one side of the press die to press the panel. (2) an upper mold and a lower mold for press working a panel; a first vertical movement mechanism for vertically moving at least one of the upper mold and the lower mold; and a first vertical movement mechanism that surrounds the upper mold and the lower mold, respectively; The upper blank holder and the lower blank holder are provided with a vertically movable upper blank holder and a lower blank holder, and a second vertical movement mechanism that vertically moves at least one of the upper blank holder and the lower blank holder. The lower blank holder is formed with gripping surfaces for gripping only the pair of opposing edges of the panel, and the stepped portion connected to the press surface of the lower die is formed with a gripping surface that is connected to the holding surface of the upper blank holder. A panel press device, characterized in that a holding surface for pressing and holding the panel is formed between the panels.