JPH0751896A - Press forming machine - Google Patents

Abstract

PURPOSE:To make the structure of the whole of a device small and light in weight and to perform the timing control easily at a forming time by forming a product having plural forming directions with drive sources smaller than those in a press forming machine. CONSTITUTION:Since when an enlarging and contracting body 14 for an outside die connected with an outside driving means 18 is lowered, an outside die 4 moves to the inside in accordance with this lowering and comes in contact with a material W to be formed, an inside die 2 connected with an inside driving means 8 is moved outside, the material W is pressed and formed between the inside die 2 and the outside die 4. Then, when the die enlarging and contracting body 14 is lowered, a forming punch pressing guide surface 16a of an outside cam block part 16 falls vertically along the forming punch pressed guide surface 12a formed on the inside cam block part 12 of the outside die and as a result, the forming punch 10 only is forced into the inside as the outside die 4 stops and the material W is punched and formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press molding machine used for press molding a thin metal plate or the like.

[0002]

2. Description of the Related Art Generally, a press-molded article is
There is one as shown in FIG. This molded product is formed by bending each of the upper and lower ends of a cylindrical main body a made of a thin metal plate to form an outer peripheral flange portion b, and the center of the main body a is a bead from the outside to the inside. A bead portion c is formed by processing.

In order to manufacture a molded product such as this, in which the molding direction of the outer peripheral flange portion b and the molding direction of the bead portion c are opposite to each other, the conventional manufacturing method is as shown in FIGS. A press molding machine as shown in 8 is used.

In this press molding machine, as shown in FIG. 5, a workpiece W is placed between an inner die 2 and an outer die 4 that clamp the workpiece W, and from this initial state, As shown in FIG. 6, the outer mold expander / contractor 1 connected to the outer drive source 18
4 descends. Along with this, the outer mold 4 is pressed by the outer mold expansion / contraction body 14 to move inward, and stops in a state of contacting the workpiece W. Next, as shown in FIG. 7, the inner mold expanding / contracting body 6 connected to the inner drive source 8 descends and is pressed by the inner mold expanding / contracting body 6 to expand and move the inner mold 2 outward. . As a result, the workpiece W is pinched between the inner mold 2 and the outer mold 4, and the dimensional accuracy is forced and the outer peripheral flange portion b is molded at the same time. Next, as shown in FIG. 8, the forming punch 10 connected to the lateral drive source 24 such as a hydraulic cylinder is extruded inward to form the bead portion c. After that, the operation is reversed to return to the initial state. In the figure, 20 is a base and 22 is an outer wall.

[0005]

By the way, in the molded product as shown in FIG. 9, the molding direction of the outer peripheral flange portion b and the molding direction of the bead portion c are opposite to each other as described above. In the conventional device, it is necessary to provide not only the two driving sources 8 and 18 for molding the outer peripheral flange portion b but also the lateral driving source 24 for molding the bead portion c separately from this. That is, the conventional device has three independent drive sources 8, 18, and 24 as the entire device, which not only increases the size and complexity of the entire device, but also increases the drive source 8,
The timing control for driving 18, 24 was also complicated.

The present invention has been made in view of the above problems, and it is possible to process a product having a plurality of molding directions with a smaller number of driving sources than that of the conventional product, so that the entire apparatus can be processed as compared with the conventional apparatus. It is an object to reduce the size and weight of the structure and to easily control the timing of molding.

[0007]

The present invention adopts the following constitution in order to solve the above problems.

That is, in the press molding machine according to the present invention, the inner mold and the outer mold for pressing the work piece are provided so as to be expandable and contractable, and the outer mold is closely spaced from the inner mold. The molding punch to be slidably provided in a state of being urged outward, each outer end of the outer die and the molding punch is notched obliquely to form a surface to be pressed,
Inner cam block portions are formed on the upper and lower ends of the pressure-exposed surface of the outer die, and an outer die expansion / contraction body is provided outside the outer die so as to be vertically movable. An inner end of the pressurizing member is obliquely cut out to form a pressurizing surface that is in sliding contact with the pressurizing surface, and outer cam block portions that engage with the inner cam block portion are formed at upper and lower ends of the pressurizing surface. , The inner cam block part and the outer cam block part,
In each case, the forming punch pressure guide surface is formed by notching vertically, while the inner die has an inner driving means for expanding and contracting the inner die, and the outer die expanding and contracting body drives it vertically. The outer driving means are connected to each other.

[0009]

In the above structure, when the outer mold expanding / contracting body connected to the outer driving means descends, the outer mold moves inwardly with the outer mold expanding / contracting body in contact with the workpiece. To stop. At this time, the inner cam block portion provided on the outer die and the outer cam block portion provided on the outer die expansion / contraction body engage with each other.

Next, when the inner die connected to the inner driving means is moved outward, the material to be processed is pressed between the inner die and the outer die to perform press forming.

Subsequently, when the outer die expansion / contraction body is lowered, the forming punch pressure guide surface of the outer cam block is vertically aligned with the forming punch pressure guide surface formed on the inner cam block of the outer die. Descend to. In response to this, the outer die remains stopped, and only the forming punch is extruded inward to punch-form the workpiece. After that, the operation is reversed to return to the initial state.

As described above, according to the present invention, since the two driving sources continuously perform the three-step operation, not only the number of parts is reduced and the whole structure is simplified, but also the timing control is performed. It will be easier.

[0013]

1 to 4 are vertical sectional views showing the structure of a press molding machine according to the present invention in the order of the molding process, and the portions corresponding to the conventional example shown in FIGS. Add a sign.

The press molding machine 1 of this embodiment is provided with an inner mold 2 and an outer mold 4 for compressing a substantially cylindrical work W, which are expandable and contractable. And the inner mold 2
The inner mold expansion / contraction body 6 having a truncated cone shape is engaged with the inner mold expansion / contraction body 6, and an inner driving means 8 for vertically driving the inner mold expansion / contraction body 6 is connected to the inner mold expansion / contraction body 6.

On the other hand, at a plurality of positions of the outer die 2, molding punches 10 which are closely spaced from the inner die 2 are slidably provided outwardly while being biased by a spring or the like (not shown). There is. The inner tips of the left and right forming punches 10 have different shapes. The outer mold 4 and the forming punch 10 are formed by obliquely notching the outer ends of the outer die 4 and the forming punch 10 to form pressure-applied surfaces 4a and 10a. The block portion 12 is formed.

Further, an outer mold expansion / contraction body 14 is provided on the outer side of the outer mold 4 so as to be movable up and down, and the inner end of the outer mold expansion / contraction body 14 is cut out obliquely. A pressurizing surface 14a is formed in sliding contact with each of the pressurized surfaces 4a and 10a, and an outer cam block portion 16 that engages with the inner cam block portion 12 is formed at the upper and lower ends of the pressurizing surface 14a. The opposite sides of the inner cam block portion 12 and the outer cam block portion 16 are vertically cut to form forming punch pressure guide surfaces 12a and 16a, respectively.

Further, an outer driving means 18 for vertically driving the outer mold expansion / contraction body 14 is connected to the lower end portion of the outer mold expansion / contraction body 14.

Reference numeral 20 is a flat base, and 22 is a cylindrical outer wall.

Next, the forming operation of the workpiece W by the press forming machine 1 having the above construction will be described.

FIG. 1 shows an initial state before forming the workpiece W, in which both the inner drive means 8 and the outer drive means 18 are located at the top dead center. Then, the cylindrical workpiece W is set between the inner die 2 and the outer die 4.

From the state shown in FIG. 1, the outer driving means 18 is activated and the outer mold expansion / contraction body 14 connected thereto is lowered. In this case, the pressing surface 14a of the outer mold expansion / contraction body 14
Is in sliding contact with the surface to be pressed 4a of the outer mold 4, the outer mold 4 is pressed inward as the outer mold expansion / contraction body 14 descends and moves, and the outer mold 4 is processed. The outer driving means 18 is stopped in a state of being in contact with the material W. At this time, as shown in FIG. 2, since the inner cam block portion 12 provided on the outer die 4 and the outer cam block portion 16 provided on the outer die expansion and contraction body 14 are engaged with each other, the forming punch 10 is formed. The inner tip of the is slightly retracted from the inner peripheral surface of the outer mold 4, and contact with the workpiece W is avoided.

Next, from the state shown in FIG. 2, the inner driving means 8 is activated and the inner mold expanding / contracting body 6 connected thereto is lowered. Then, in response to this, the inner die 2 moves outward, so that the workpiece W is pinched between the inner die 2 and the outer die 4 as shown in FIG. And the molding of the outer peripheral flange portion b are performed simultaneously.

Subsequently, when the outer driving means 18 is restarted from the state shown in FIG. 3 to lower the outer die expansion / contraction body 14, the outer cam block portion 16 of the outer die expansion / contraction body 14 is moved.
The molding punch pressure guide surface 16a of FIG. 1 vertically descends while slidingly contacting the molding punch pressure guide surface 12a of the inner cam block portion 12 of the outer die 4. Further, in this state, the pressure surface 14a of the outer die expansion / contraction body 14 is in sliding contact with the pressure surface 10a of the forming punch 10, but is separated from the pressure surface 4a of the outer die 4. Then, the outer die 4 remains stopped, and only the forming punch 10 is extruded inward, so that the workpiece W is punched and the bead portion c is formed on the workpiece W as shown in FIG. It is formed.

After that, the operation is reversed to return to the initial state.

In the above embodiment, the case where the flange portion b is formed on the outside and the bead portion c is formed on the inside has been described. However, when the product shape is uneven, the structure and operation are reversed. However, the present invention can be applied in the same manner.

Further, this mechanism is not limited to the above-mentioned embodiment, but can be applied to processing such as simple bending, punching, and overhang forming.

[0027]

According to the present invention, in the past, an individual drive source was required according to each molding content, but by adding a cam block or the like, a drive source smaller than the molding content can be obtained. Since molding can be performed in the same way as in the past, the number of parts can be reduced, cost can be reduced, size and weight can be reduced, and timing control is easier than before, and maintenance effort is also reduced. To be done.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an initial state of press molding of a press molding machine according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an intermediate state of press molding of the press molding machine according to the present invention.

FIG. 3 is a vertical cross-sectional view showing an intermediate state of press molding of the press molding machine according to the present invention.

FIG. 4 is a vertical sectional view showing a press-molding completed state of the press molding machine according to the present invention.

FIG. 5 is a vertical cross-sectional view showing an initial state of press molding of a conventional press molding machine.

FIG. 6 is a vertical cross-sectional view showing a state in the middle of press molding of a conventional press molding machine.

FIG. 7 is a vertical cross-sectional view showing a state in the middle of press molding of a conventional press molding machine.

FIG. 8 is a vertical cross-sectional view showing a press molding completed state of a conventional press molding machine.

FIG. 9 is a vertical cross-sectional view showing an example of the shape of a press-formed product.

[Explanation of symbols]

1 ... Press molding machine, 2 ... Inner mold, 4 ... Outer mold, 4a
... Pressurized surface, 6 ... Inner mold expansion / contraction body, 8 ... Inner drive means,
DESCRIPTION OF SYMBOLS 10 ... Forming punch, 10a ... Pressed surface, 12 ... Inner cam block part, 12a ... Horizontal mold pressing guide surface, 14 ... Outer mold expansion / contraction body, 14a ... Pressing surface, 16 ... Outer cam block part, 16a ... Forming punch pressure guide surface, 18 ... Outside driving means.

Claims (1)

[Claims] 1. An inner die and an outer die for sandwiching a material to be processed are provided so as to be expandable and contractable, respectively, and the outer die is provided with a forming punch which is closely spaced from the inner die. The outer mold and the forming punch are slidably provided in a biased state, and the outer ends of the outer die and the forming punch are notched diagonally to form a surface to be pressed, and the upper and lower ends of the surface to be pressed of the outer die are formed. Is formed with an inner cam block portion, and an outer mold expansion / contraction body is vertically movable outside the outer mold, and an inner end of the outer mold expansion / contraction body is notched obliquely. A pressurizing surface that is in sliding contact with the pressurized surface is formed, and outer cam block portions that engage with the inner cam block portion are formed at upper and lower ends of the pressurizing surface, and the inner cam block portion and the outer cam block portion are formed. All have vertical cutouts for forming punch pressure guides. While the surfaces are respectively formed, inner driving means for driving the inner mold to expand and contract, and outer driving means for vertically driving the inner mold expanding and contracting body are respectively connected to the inner mold. A press molding machine characterized by.