JPH0618655Y2 - Press molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a press forming apparatus, and more particularly, to draw forming a plurality of drawn products simultaneously or selectively draw only individual products. The present invention relates to a press forming apparatus.

(Prior Art) By molding a plurality of products at the same time with the same press molding device, manufacturing cost and die cost of a press die can be reduced and the yield of conveyed material (hereinafter referred to as blank material) can be improved. (For example, Japanese Patent Application No. Sho 62-2,
372). However, when only one of the multiple products is required, the unnecessary product is also molded at the same time, so a space for accommodating the unnecessary product thus molded is required. Or, if it is discarded, there is a problem that the cost of the product increases.

In view of such circumstances, a press forming apparatus has been proposed which is capable of forming a plurality of drawn products at the same time or selectively forming only individual drawn products (for example, Japanese Patent Publication No. 62-60). , 175, etc.).

As this type of press molding apparatus, there is one as shown in FIGS.

The press molding apparatus 1 has a lower mold 2 and an upper mold 3 that moves back and forth toward the lower mold 2.

The lower die 2 has a bolster 4 and a die 5 fixed on the bolster 4. This press forming device 1
Is for molding two drawn products at the same time, the die 5 is formed with a first recessed portion 6a and a second recessed portion 6b having a shape corresponding to the outer surface shape of the drawn product. ing.

The upper die 3 includes a first punch 7a for drawing a blank material in cooperation with the first recess 6a of the die 5 and a blank material in cooperation with the second recess 6b adjacent to the first punch 7a. It has a second punch 7b for drawing and a blank holder 8 for holding a blank material between the die 5 and the die. The blank holder 8 is fixed to an outer ram 10 that moves up and down by a driving unit (not shown). The outer ram 10 is equipped with first and second cylinder devices 11a and 11b which are driven by air pressure or the like to move the punches 7a and 7b up and down with respect to the outer ram 10, respectively.

Both cylinder devices 11a and 11b are adapted to selectively introduce air pressure and the like by remote control.
It is possible to introduce it into either one or both. For example, as shown in FIG. 5, unless air pressure or the like is introduced into the first cylinder device 11a, the first punch 7a is not held and is lowered by its own weight with respect to the outer ram 10.
On the other hand, under the condition where the air pressure or the like is introduced into the second cylinder device 11b, the second punch 7b is held in a raised state with respect to the outer ram 10. In this way, the punch 7 that can move vertically with respect to the outer ram 10
A and 7b are provided with first and second convex portions 12a and 12b having a shape corresponding to the inner surface shape of the drawn product, corresponding to the recesses 6a and 6b.

With such a conventional press forming apparatus 1, the blank material P is
In the case of drawing and processing into a molded product, two molded products can be simultaneously drawn, or only one of the molded products can be molded.

First, a case where only the second molded product is drawn by the second punch 7b will be described with reference to FIG.

The blank material P at this time has a size corresponding to the second molded product, and the blank material P is gripped by a conveyor device (not shown) under the condition that the upper die 3 is lifted, and the blank material P is formed. It is carried in between the punches 7a and 7b, and is placed on the second recess 6b of the die 5. No air pressure is introduced into the first cylinder device 11a, and the first punch 7
a is in a state of being lowered with respect to the outer ram 10 due to its own weight. On the other hand, air pressure is introduced into the second cylinder device 11b, and the second cylinder device 11b is held at a position raised with respect to the outer ram 10. When the blank material P is arranged at a predetermined position, the outer ram 10 in the above-described state is lowered, one end Pa of the blank material P is clamped between the blank holder 8 and the die 5, and the other end Pb is First punch 7a
The first convex portion 12a and the first hollow portion 6a of the die 5 are pressed and sandwiched by the weight of the first punch 7a.
Under this state, when the introduction of air pressure to the second cylinder device 11b is cut off, the second punch 7b descends due to its own weight, and the second protrusion 12b and the second recess 6b cooperate with each other. The blank material P is drawn. When the draw forming is completed, the upper die 3 moves up again and is separated from the lower die 2. At this time, a spring lifter (not shown) raises the second molded product to the carry-out position. In this way, the second molded product, which has been drawn in this step, is gripped again at the carrying position (not shown), carried out to the next step, and subjected to the next processing.

In this way, when only one of the molded products W is molded, the air pressure is introduced in advance to the cylinder device 11a (11b) corresponding to the one punch 7a (7b) to be molded, and the other punch 7b. No air pressure is introduced into the cylinder device 11b (11a) corresponding to (7a), and the upper mold 3 is lowered in this state. Then, one end of the blank P is provided with the other punch 7b (7a) and the recess 6b of the die 5.
It is sandwiched between (6a) and the one punch 7a (7
According to b), the blank P is drawn.

Next, a case where two molded products are simultaneously drawn will be described.

The blank material P at this time has a size corresponding to the first molded product and the second molded product. Further, air pressure is introduced into both the first and second cylinder devices 11a and 11b, and the first and second punches 7a and 7b are held at a position higher than the outer ram 10. When the blank material P is arranged at a predetermined position, the outer ram 10 in the above-described state descends as shown in FIG. 6, and both ends Pa and Pb of the blank material P are located between the blank holder 8 and the die 5. Will be sandwiched between. And both cylinder devices 11
When the introduction of air pressure or the like into a and 11b is cut off, both punches 7a and 7b descend due to their own weight, and the blank material P is formed by drawing in cooperation with the recesses 6a and 6b of the die 5. , The first molded product and the second molded product are molded.
When the draw forming is completed, the upper mold 3 is separated from the lower mold 2 and the two molded products in which the spring lifter (not shown) is integrated are moved up to a predetermined carry-out position, as described above. Then, it is gripped again by a not-shown transport device and carried out to the next step, and for example, both molded products are cut and separated.

(Problems to be Solved by the Invention) Generally, since the punches 7a and 7b in the press molding apparatus weigh several tons, the cylinder device 11 described above is used.
Since it is necessary to hold this weight, a and 11b inevitably increase in size. Moreover, the cylinder devices 11a, 1
Punches 7a, 7b for the outer ram 10 using 1b
Since the mold is moved up and down, the mold structure of the upper mold 3 itself becomes complicated, which causes an increase in mold cost. Further, the size of the upper mold 3 becomes larger than necessary, and there is a problem that the installation space of the press molding apparatus or the storage space for storing the mold increases. Further, generally, in the case of drawing, the elongation rate of the blank material P is decreased, and the molded product W is cracked during molding.
In order to prevent wrinkles, tension, etc., the blank material P is controlled so as to flow into the mold during molding. The control of the presser is performed by sliding the portions that hold the blank material P, that is, by cutting the die and adjusting the holding force applied to the blank material P.

However, in the conventional press-molding apparatus 1, as shown in FIG. 5, when only one of the molded products is formed by drawing, one end of the blank P has one punch 7a.
It is clamped between the convex portion 12a (12b) of (7b) and the corresponding concave portion 6a (6b) of the die 5, and the clamping force is equivalent to the own weight of the punch 7a (7b). is there. As described above, one of the portions for sandwiching the blank material P is the convex portion 12a (12b) and the recess portion 6a (6b) for drawing the molded product. However, there is a possibility that cracks may occur in the molded product.

Therefore, the cylinder device 11 on the side that clamps the blank material P
It may be possible to adjust the clamping force by controlling the introduction of air pressure or the like into a and 11b, but it is not easy to control the introduction amount of such air pressure, and it takes time and labor for the entire drawing process. Has a drawback that it is significantly impaired.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and when forming a plurality of drawn products at the same time or selectively forming only individual drawn products, a crack or the like An object of the present invention is to make it possible to mold a high quality molded product without causing molding defects.

(Means for Solving the Problems) The present invention for achieving the above object includes a punch for forming at least two drawn products on a blank material in cooperation with the die above a lower die having a die, and An upper die having a blank holder for holding a blank material between the die holding portion and the die holding portion is installed so as to be relatively close to and away from the lower die, and the two drawn products are drawn simultaneously. Alternatively, in a press molding apparatus capable of selectively draw-forming only individual drawn products, in the punch of a portion corresponding to between the two drawn products of the blank material, the lower mold is formed by an elastic member. The inner blank holder elastically attached toward the inner slide holder is slidably attached, and the cam slide having the holding portion for sandwiching the blank material with the inner blank holder is attached to the cam slide. It is possible to move forward and backward to a forward position where it has advanced to the upper die to a position where it is approximately at the same height as the die holding portion, and to a retracted position where the holding portion has retracted relative to the upper die than the die holding portion. Attached to the lower mold, the cam slide is moved to the retracted position when simultaneously drawing the at least two drawn products, and the cam slide when selectively drawing only individual drawn products. And a cam driver for moving the cam slide to the forward movement position and maintaining the cam slide at the forward movement position until the draw forming is completed. The cam driver is slidably provided on the lower die.

(Operation) In the present invention, when at least two drawn products are simultaneously drawn by the cooperation of the punch of the upper mold and the die of the lower mold, the cam slide is driven by the cam driver. , The pressing portion has moved to a retracted position retracted with respect to the upper die than the pressing portion of the die. And
As the upper die is relatively moved toward the lower die, the blank material is clamped by the die holding portion and the blank holder at the outer peripheral portion thereof, and at the portion corresponding to the two drawn products. It is clamped between the inner blank holder and the holding part of the cam slide so that at least two drawn products are drawn simultaneously. At this time, since the cam slide is moving to the retracted position, the blank material sandwiched between the inner blank holder and the pressing portion of the cam slide is not stretched more than necessary, and the molding amount does not increase. . As a result, molding defects such as cracks do not occur in the product during molding.

On the other hand, when selectively forming only individual drawn products, the cam slide is driven by the cam driver,
The pressing portion is moved to the advanced position advanced to the upper die to a position where the pressing portion has substantially the same height as the pressing portion of the die. Then, as the upper mold is relatively moved toward the lower mold,
The blank material is sandwiched between the pressing portion of the die and the blank holder, and also sandwiched between the inner blank holder and the pressing portion of the cam slide, so that only individual drawn products are selectively drawn. At this time, since the cam slide moves to the forward position and is maintained at the forward position until the drawing is completed, the blank material is clamped between the blank holder and the die, and the inner blank holder and the cam slide are The sandwiching of the blank material with the pressing portion is performed in the same manner. As a result, molding defects do not occur in the product during molding.

Therefore, even when at least two drawn products are drawn simultaneously, or when only individual drawn products are selectively drawn, product defects such as cracks and wrinkles occur in the products. It becomes possible to mold a high quality product without performing.

Although the position of the cam slide retainer changes due to simultaneous molding or individual molding, the inner blank holder moves in accordance with the change in the position of the cam slide retainer due to elastic deformation of the elastic member. ing.

(Embodiment) A press molding apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a press-molding apparatus according to an embodiment of the present invention, and in particular, a longitudinal cross-sectional view of essential parts showing a state in which only one molded product is selectively molded, and FIG. FIG. 5 is a longitudinal cross-sectional view of a main part showing a state of molding a molded product,
The same members as those of the conventional press-forming apparatus shown in the figure are designated by the same reference numerals, and the description thereof will be partially omitted.

The illustrated press forming apparatus 1a of the present invention is for forming two drawn products at the same time, or selectively forming only one drawn product, and is directed toward the lower mold 2 and the lower mold 2. It has an upper mold 3 that moves back and forth.

The lower die 2 has a die 5 fixed on the bolster 4, and the die 5 has a first recess 6a and a second recess 6b.
And are formed. In addition, on the outer periphery of the upper end of the die 5,
Pressing portions 13a and 13b for sandwiching the blank P with the blank holder 8 are formed.

The upper mold 3 has a first punch 7a for drawing a blank material in cooperation with the recesses 6a, 6b, a second punch 7b, and a blank holder 8 for holding the blank material. The punches 7a and 7b have recessed portions 6a and 6b.
Corresponding to, the first and second convex portions 12a and 12b are formed. The punches 7a and 7b are fixed to an inner ram 9 that moves up and down by a driving unit (not shown), and a blank holder 8 is also fixed to an outer ram 10 that also moves up and down.

An inner blank holder 14 for holding the blank material P when the upper die 3 approaches the lower die 2 is provided at a position corresponding to each of the punches 7a and 7b.
5 is provided so as to be slidable up and down while being elastically added in the downward direction in the figure.

On the other hand, a cam slide 17 having a holding portion 16 is formed at a position corresponding to between the two recessed portions 6a and 6b of the die 5 in order to hold the blank material with the inner blank holder 14. It is attached to the lower mold 2 so as to be able to move forward and backward.

The cam slide 17 is provided in the cam driver 1 described in detail later.
8 and is slid along a sliding surface 19 formed on the die 5 so that the holding portion 16 is substantially flush with the holding portions 13a and 13b of the die 5 relative to the upper die 3. Are moved forward and backward, and the pressing portion 16 is moved back and forth toward the upper die 3 to a retracted position in which the pressing portion 16 is retracted with respect to the upper die 3 with respect to the pressing portions 13a and 13b of the die 5.

The cam driver 18 that drives the cam slide 17 is slidable along the sliding surface 21 of the base portion 20 fixed to the bolster 4. An actuator 22 that is operated by air pressure or hydraulic pressure to slide the cam driver 18 is attached to the base portion 20, and a rod 23 of the actuator 22 is attached to the cam driver 1.
Connected to eight. And this cam driver 18
Is a forward limit position for moving the cam slide 17 forward toward the upper mold 3 as shown in FIG. 1 and a backward limit position for moving the cam slide 17 backward from the upper mold 3 as shown in FIG. Move between and.

In the case of molding only one of the molded products, a molded product of good quality cannot be obtained unless the outer periphery of the blank material P is pressed and held substantially at the same pressure. Therefore, at this time, by moving the cam driver 18 to the forward limit position and moving the cam slide 17 forward to the upper position toward the upper mold 3, the blank holder 8 and the pressing portion 13 are moved.
The nipping position by a and 13b and the nipping position by the inner blank holder 14 and the holding portion 16 are located on substantially the same horizontal plane. Furthermore, when selectively forming only individual drawn products in this manner, the cam driver 18 is maintained at the forward limit position and the cam slide 17 is maintained at the advanced position until the draw forming is completed. .

Further, when the two molded products are simultaneously molded, when the cam slide 17 is in the raised forward position, the blank material P
Since the amount of molding of is increased and the material is cracked, at this time, the cam driver 18 is moved to the backward limit position,
The cam slide 17 is lowered to slide the sliding surface 2 of the base portion 20.
1, and the cam slide 17 is moved to the retracted position.

When the upper die 3 moves up and down, the pressing portions 13a, 1a of the die 5
The contact surface 24 formed on the blank holder 8 comes into contact with 3b, and the sliding surface 25 formed on the punches 7a and 7b and the sliding surface 26 formed on the blank holder 8 come into contact with each other and the upper die The lower mold 3 and the lower mold 2 are horizontally positioned with respect to each other.

Next, with the press molding apparatus 1a configured as described above,
The procedure for molding the product will be described.

First, a case where only one molded product (first molded product) W1 is drawn will be described with reference to FIG.

The first molded product W1 in this case has a drawn shape as shown in FIG. 4, and the blank material P having a size corresponding to this molded product W1 is so,
The die 5 and the punch 7 are gripped by a carrier device (not shown).
It is carried in between a and 7b. At this time, the cam driver 18 moves to the forward limit position, and along with this movement, the cam slide 17 moves to the forward position as shown in the figure. Therefore, the pressing portion 13a of the die 5 and the pressing portion of the cam slide 17 are moved. 16 will be located on substantially the same horizontal plane. And the blank material P is arrange | positioned on the 1st hollow part 6a of the die 5 so that both ends Pa and Pb may contact the pressing parts 13a and 16.

When the blank material P is placed at a predetermined position, the blank holder 8 fixed to the outer ram 10 is lowered, and one end Pa of the blank material P is brought into contact with the contact surface 24 of the blank holder 8.
And the pressing portion 13a of the die 5 is pressed and sandwiched.

Next, when the inner ram 9 approaches and descends to the lower mold 2, the inner blank holder 14 contacts the other end Pb of the blank material P. When the inner ram 9 further descends, the elastic member 1
5 is elastically deformed, and the elastic force associated with this causes the inner blank holder 14 to press and clamp the other end Pb of the blank material P between the inner blank holder 14 and the holding portion 16 of the cam slide 17.

Then, when the inner ram 9 further descends and reaches the bottom dead center, the blank material P is drawn by the cooperation of the first punch 7a and the first hollow portion 6a. In this processing state, the cam slide 17 is maintained at the forward position until the drawing is completed, the holding position by the blank holder 8 and the holding portion 13b, the inner blank holder 14 and the holding portion 1 are held.
Since the clamping position by 6 and 6 are located on substantially the same horizontal plane, the machining clamping force at both ends Pa and Pb of the blank P is substantially the same. Further, the blank material P sandwiched between the ends Pa and Pb is partly squeezed between the first protrusion 12a of the first punch 7a and the first recess 6a of the die 5, Both ends Pa, by adjusting the elastic force of the elastic member 15 or by sliding the sandwiched portions,
Since it is possible to finely adjust the pressure clamping force in Pb to make them almost the same, molding defects such as cracks will not occur in the first molded product W1 during molding.

When the draw forming is completed, the upper die 3 moves up again and is separated from the lower die 2. At this time, a spring lifter (not shown) raises the first molded product W1 to the carry-out position. In this way, the first molded product W1 molded in the shape shown in FIG. 4 in this step is again gripped by the unloading device (not shown), carried out to the next step, and subjected to the next processing. Become.

Next, referring to FIG. 2, two molded products W1 and W2 are formed.
A case where (hereinafter collectively referred to as W) is simultaneously drawn will be described.

The molded product W in this case has the shape shown in FIG. 3, and the blank material P having a size corresponding to this molded product W is carried in in the same manner as described above. At this time, the cam driver 18 moves to the backward limit position and the cam slide 17
As shown in the drawing, is moved down to the retracted position by the thickness of the cam driver 18, and is in contact with the base portion 20. The blank material P has both end portions Pa and P.
b so that it contacts the pressing portions 13a, 13b of the die 5,
It is arranged on both recessed portions 6a and 6b.

Then, the blank holder 8 fixed to the outer ram 10 descends, and both ends Pa and Pb of the blank P are pressed and sandwiched between the contact surface 24 and the holding portions 13a and 13b.

When the inner ram 9 descends in this state, the inner blank holder 14 contacts the substantially central portion of the blank material P. When the inner ram 9 further descends, the elastic member 15 elastically deforms, and the elastic force associated therewith causes the inner blank holder 14 to press the blank material P and the cam slide 1
Therefore, the substantially central portion of the blank P is pressed and sandwiched between the pressing member 16 of No. 7 and the pressing unit 16.

Then, as shown in the drawing, when the inner ram 9 reaches the bottom dead center, the drawing corresponding to the first molded product W1 is performed by the cooperation of the first punch 7a and the first recess 6a, and the second molding is performed. The punching corresponding to the second molded product W2 is performed by the cooperation of the punch 7b and the second recess 6b. Under this pressurizing state, the cam slide 17 is in the retracted position lowered by the thickness of the cam driver 18, so that the blank material P is not stretched more than necessary at the central portion and the forming amount is not increased. Therefore, molding defects such as cracks do not occur in the molded product W during molding.

After the draw forming is completed, the molded product W is carried out to the next step in the same manner as described above, and the molded product W is transferred to the first molded product W1.
Further, a process such as cutting and separating is performed on the second molded product W2.

In the illustrated embodiment, two drawn products are formed at the same time, but it is also possible to form three or more products at the same time. In the case of forming three products, A cam slide and an inner blank holder corresponding to the cam slide may be provided in an amount corresponding to each product.

It is also theoretically possible to move the lower mold 2 toward the upper mold 3.

(Effect of the Invention) According to the present invention, the inner blank holder elastically added to the lower mold by the elastic member can be slid on the punch of the blank material corresponding to at least two drawn products. Attach the cam slide having a holding portion that holds the blank material between the inner blank holder and the inner blank holder, and move the cam slide forward with respect to the upper die to a position where the holding portion has substantially the same height as the holding portion of the die. , The cam slide is attached to the lower mold so that the pressing part can move forward and backward to a retracted position retracted from the upper mold with respect to the pressing part of the die, and the at least two drawn products are drawn simultaneously. To the retracted position, and when selectively forming only individual drawn products, move the cam slide to the advanced position and press the cam slide until completion of drawing. Since the cam driver for maintaining the forward position at the forward position is slidably provided on the lower mold, when at least two drawn products are drawn at the same time, the inner blank holder and the cam slide in a portion corresponding to the products are drawn. The blank material sandwiched between the pressing part of the blank material will not be stretched more than necessary and the amount of molding will not increase, and when selectively drawing only individual drawn products, the edge of the blank material will not be drawn. Since the parts can be equally sandwiched, it is possible to mold a high quality product without causing cracks or wrinkles in the product.

Moreover, since it is possible to mold only the required product, the yield of blank material can be improved and the number of steps can be reduced, and the productivity of drawing can be improved.

[Brief description of drawings]

FIG. 1 is a press molding apparatus according to an embodiment of the present invention, which is a longitudinal sectional view of a main part showing a state in which only one molded product is selectively molded, and FIG. 2 is the device shown in FIG. 3 is a longitudinal sectional view of a main part showing a state in which a plurality of molded articles are molded by
FIG. 1 is a perspective view showing a molded product by the press molding apparatus of the present invention, and FIGS. 5 and 6 are cross-sectional views of a main part of a conventional press molding apparatus. 2 ... lower mold, 3 ... upper mold, 5 ... die, 7a ... first punch, 7b ... second punch, 8 ... blank holder, 13a, 13b ... die pressing part 14 ... inner side Blank holder, 15 ... Elastic member, 16 ... Cam slide retainer, 17 ... Cam slide, 18 ... Cam driver, P ... Blank material, W ... Molded product, W1 ... First molded product, W2: Second molded product.

Claims (1)

[Scope of utility model registration request] 1. A punch for forming at least two drawn products on a blank material in cooperation with the die above a lower die having a die, and a blank material sandwiched between the punch and a pressing portion of the die. An upper die having a blank holder is installed so that it can be relatively moved toward and away from the lower die, and the two drawn products are drawn simultaneously, or only individual drawn products are drawn selectively. In a press forming apparatus capable of performing, an inner blank holder elastically added to the lower die by an elastic member is slidably attached to the punch of a portion of the blank material corresponding to between the two drawn products. , A cam slide having a holding portion for holding the blank material between the inner blank holder and the upper portion of the cam mold until the holding portion is substantially flush with the holding portion of the die. Attached to the lower mold so as to be able to move forward and backward between an advanced position advanced to the upper mold and a retracted position of the pressing part retracted with respect to the upper mold than the pressing part of the die, and the at least two drawn products are drawn simultaneously. When moving, the cam slide is moved to the retracted position, and when selectively forming only individual drawn products, the cam slide is moved to the advanced position and the cam slide is moved until the drawing is completed. A press forming apparatus, wherein a cam driver for maintaining the forward position is provided slidably on the lower mold.