JP2002239675A - Full enclosed forging die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a full enclosed forging die device capable of manufacturing a forging of complicate shape, a deformed forging, etc., with high accuracy. SOLUTION: A work 15 fully enclosed between an upper enclosed die 14 and a lower enclosed die 33 is forged between an upper punch 8 and a lower punch 18, a differential means 20 installed in the vicinity of the lower enclosed die 33 is operated by a working rod 12 lowered together with the upper punch 8 to reduce the descending speed of the upper and lower enclosed dies 14 and 33 with respect to the descending speed of the upper punch 8, and the pressure of an enclosed load generating means 38 provided on the upper enclosed die 14 is controlled by a pressure control means 40 to control the descending speed of the upper and lower enclosed dies 14 and 33. When the forging of complicated shape, the deformed forging, etc., are forged, the forging of high accuracy can be obtained, and the forging free from any underfill and with excellent quality can be obtained by controlling the descending speed of the upper and lower enclosed dies 14 and 33 to control the flow of the material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed forging die apparatus mainly used for performing cold closed forging.

[0002]

2. Description of the Related Art Conventionally, as this type of mold apparatus, for example, a mold apparatus disclosed in Japanese Patent Application Laid-Open No. 2000-51988 is known.

The closed forging apparatus disclosed in the above publication has upper and lower dies for performing closed forging, and a stroke transmitting member contacts an outer peripheral edge of an upper die, and a stroke transmitting member contacts the lower die side from above. A sensing member is provided.

A differential mechanism for moving the upper and lower dies up and down at half the speed of the upper punch is provided near the sensing member in conjunction with the vertical movement of the sensing member.

A piston chamber is formed in the upper plate portion and the lower plate portion to which the upper and lower dies are attached.
In these piston chambers, pistons for pressing the upper die downward and the lower die upward via rods are accommodated, and the piston chambers are connected to each other by pipes, and are constantly maintained at a constant pressure. Have been.

In the conventional closed forging device configured as described above,
When the upper die is lowered and the cavity is closed by the upper and lower dies, and the upper die is further lowered, the work in the cavity is interposed between the upper punch provided in the upper die and the lower punch provided in the lower die. Is pressed from above and below to start closed forging of the work.

After that, when the upper die is further lowered, the stroke transmitting member provided near the outer peripheral edge of the upper die contacts the sensing member from above and presses the sensing member. The moving mechanism operates to lower the upper and lower dies at half the speed of the lowering speed of the upper punch.

Accordingly, the upper punch is lowered by an amount twice as much as the lowering amount of the upper and lower dies, and the work is pressed between the upper and lower punches to flow the material into the cavity. The raw material flows to this point, and a high-precision molded product without underfill can be obtained.

[0009]

However, in the conventional closed forging device, the lowering speed of the upper and lower dies is mechanically regulated by the differential mechanism with respect to the lowering speed of the upper punch. Cannot control the lowering speed of the upper and lower dies according to

For this reason, when molding a molded article having a complicated shape or a so-called irregularly shaped article in which the left and right sides are asymmetric from the center,
There are problems that high-precision molding cannot be performed, and that a molded product of good quality cannot be obtained due to occurrence of underfill.

Also, during the molding of the workpiece, the upper punch descends at twice the speed with respect to the upper and lower dies, so that the center between the upper and lower dies and the upper and lower punches is displaced in the height direction, thereby lowering the molding accuracy. There are also problems such as letting them do it.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and provides a closed forging die apparatus capable of controlling a lowering speed of upper and lower dies. It is an object of the present invention to enable a molded article to be molded with high precision.

[0013]

In order to achieve the above object, a closed forging die device according to claim 1 is provided with an upper closing die which can be raised and lowered, and an upper closing die which is installed below the upper closing die. A lower block die for closing the work between the upper block die, an upper punch and a lower punch provided respectively on the upper block die and the lower block die, and forming the work closed by the upper and lower block dies, and installed near the lower block die. A forging die apparatus comprising: a differential means for operating the lowering speed of the upper and lower closing dies with respect to the lowering speed of the punch by operating the operating rod lowered with the upper punch. The die is provided with a closing load generating means for setting a closing load, and the closing load generating means is provided with a pressure control means for controlling a lowering speed of the upper and lower closing dies.

With the above configuration, a molded article having a complicated shape,
By controlling the pressure of the closing load generating means by the pressure control means to control the flow of the material when molding irregularly shaped products, etc. A molded article can be obtained.

Further, since the center of the cavity of the upper and lower closing dies can be maintained at the center of the height of the work formed between the upper punch and the lower punch, the fiber flow is uniform and the quality of the molding is high with high molding accuracy. A molded article can be obtained.

According to a second aspect of the present invention, there is provided a closed forging die apparatus, wherein the closed load generating means includes a hydraulic cylinder for setting a closed load of the upper and lower closing dies, and a pressure control for controlling a pressure of the hydraulic cylinder. It consists of a valve.

According to the above configuration, the pressure of the hydraulic cylinder is controlled by the pressure control valve during the forming of the work,
Since the flow of the material in accordance with the material and shape of the molded article becomes possible, high-precision molding becomes possible, and a molded article of good quality with no underfill or the like can be obtained.

According to a third aspect of the present invention, there is provided a closed forging die apparatus, wherein a differential cam is pushed down by an operating rod and urged upward by a buffer. A slide cam which comes into contact with the cam surface of the receiving cam and retreats while descending as the control cam descends, and a lower cam which is provided on the lower closing die side and which comes into contact with the cam surface of the slide cam and lowers It consists of a closing cam that reduces the speed.

According to the above configuration, the differential means can be reliably operated by the operating rod descending with the upper punch, so that the reliability is high and the configuration is simple, so that it can be provided at a low cost.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings shown in FIGS.

FIG. 1 is a cross-sectional view of the closing mold apparatus in a state where molding is completed, FIG. 2 is a plan view of the closing mold apparatus, FIG. 3 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. 3, and FIG.

The die body 1 includes an upper die set 3 attached to the lower surface of a slide 2 of a forging press (not shown) formed of a hydraulic press and moved up and down, and a bolster (or a bolster installed below the slide 2). The lower die set 5 is fixed on the bed 4.

The upper die set 3 has an upper base 6 attached to the lower surface of the slide 2, and an upper punch 8 is fixed downward at the center of the lower surface of the upper base 6 via a punch holder 7.

An upper punch 8 is provided at the lower corner of the upper base 6.
For example, four guide posts 9 are erected so as to surround the center of the upper die set 3 and the lower die set 5 with high precision. Then, the upper die set 3 is moved up and down.

An arm 10 is provided below the upper base 6 so as to cross the center of the upper die set 3 in the left-right direction.

Both ends of the arm 10 are vertically slidably supported by an operating rod 12 projecting downward from the lower surface of the upper base 6, and an opening 10a vertically penetrating the center of the arm 10. Is open.

The upper step portion 10 is provided at the upper and lower opening edges of the opening portion 10a.
b and a lower portion 10c are formed. The upper portion 10b is formed slightly larger than the outer diameter of the punch holder 7 so that the punch holder 7 does not interfere with the arm 10 when the upper punch 8 is lowered. Upper block holder 1 at 10c
An upper closing die 14 is attached via 3.

The upper closing die 14 has a through hole 14a vertically penetrating at the center thereof, and the tip of the upper punch 8 is inserted into the upper closing die 14 from above the through hole 14a. A cavity 14b for molding the work 15 is formed below the hole 14a.

On the other hand, the lower die set 5 has a lower base 16 fixed on the bolster (or bed) 4, and a receiving member 17 is installed at the center of the upper surface of the lower base 16.

At the center of the receiving member 17, a lower punch 18 is provided.
Is supported so as to penetrate vertically, and a differential means 20 is provided around the receiving member 17.

As shown in FIGS. 3 and 4, the differential means 20 has a cam means 21 in a cross direction around the lower punch 18.

The cam means 21 includes a receiving cam 22 fixed on the lower base 16 and a cam surface 22 of the receiving cam 22.
a slide cam 23 in contact with a
And a closing cam 25 abutting on the upper cam surface 23b of the slide cam 23.

The cam surface 22a of the receiving cam 22 is inclined downward to the outside from the center side, and the cam surface 24a of the control cam 24 which contacts the cam surface 23a of the slide cam 23 is inclined downward to the center from the outside. ing.

The control cam 24 is urged upward by a buffer means 27 made of an elastic material such as rubber, and its outer surface is vertically moved by a wear plate 28a provided on the inner surface of a cam case 28 fixed on the lower base 16. It is slidably contacted.

The slide cam 23 is formed, for example, in a disk shape divided into four parts in the circumferential direction as shown in FIG.
The upper cam surface 23b is inclined lower toward the center than the outer surface, and the cam surface 25a of the closing cam 25 having the same inclination angle contacts the cam surface 23b from above.

The upper surface of the closing cam 25 is formed horizontally and the end surface on the center side is formed vertically, and the lower surface of the closing pad 30 and the outer peripheral surface of the cylindrical portion 30a are in contact with the upper surface and the end surface. 30.

The closing pad 30 has a cylindrical portion 30a which is fitted to the outer peripheral surface of the receiving member 17 so as to be slidable up and down, protruding from the lower surface, and rubber or the like is provided around the receiving member 17 at equal intervals. The upper end of the buffer body 31 made of an elastic body is
It is in contact with the lower end of a from below.

In the center of the closing pad 30, a through hole 30b into which the upper end of the lower punch 18 is inserted from below is formed, and is formed on the upper surface of the closing pad 30 so as to surround the through hole 30b. The lower block die 33 is attached to the formed concave step portion 30c via the lower block die holder 32.

A through hole 33a penetrating vertically is formed at the center of the lower closing die 33.
Lower punch 18 also serving as knockout pin from below 3a
Is inserted into the lower closing die 33, and the through hole 3
In the upper part of 3a, a cavity 33 for molding the work 15 with a cavity 14b formed in the upper closing die 14.
b is formed.

On the outer peripheral side of the closing pad 30, a guide hole 3 is provided.
A bush 35 is press-fitted and fixed in these guide holes 33d, and a tip of a guide pin 34 protruding from the lower surface of the arm is inserted into the bush 35 from above.

A step portion 30e is formed on the outer peripheral portion of the closing pad 30, and a ring 36 is engaged with the step portion 30e from above, and the ring 36 is a ring fixed to the upper surface of the control cam 24. The control pad 37 is housed in the shape control pad 37 so as to be vertically slidable.

Then, the tip of the operating rod 12 lowered together with the slide 2 is brought into contact with the upper surface of the control pad 37 from above, and the control pad 37 is pushed down by the operating rod 12, so that the differential means 20 will be described later. Is to be operated.

On the other hand, in the slide 2 to which the upper die set 3 is attached, a closing load generating means 38 is provided.

The closing load generating means 38 comprises a plurality of hydraulic cylinders 39 and pressure control means 40.

The hydraulic cylinder 39 has a cylinder 39a installed in the slide 2 and a piston rod 39c extending downward from a piston 39b housed in the cylinder 39a.
Is protruding.

The distal end of the piston rod 39 is connected to the upper end of a connecting rod 41 provided to penetrate the upper base 6 in the vertical direction, and the lower end of the connecting rod 41 is connected to the upper surface of the arm.

A hydraulic chamber 39d provided on the bottom side of each cylinder 39a is connected to a pressure control means 40 by a pipe 42.
Is connected to the hydraulic pump 43 via the.

The pressure control means 40 is constituted by, for example, a pressure control valve. The pressure control means 40 maintains the pressure in the hydraulic chamber 39d at a preset closing load, and also controls the pressure in the hydraulic chamber 39d according to the material and shape of the molded product. Of the upper and lower closing dies 1 with respect to the lowering speed of the upper punch 8 by controlling the pressure of the upper punch 8.
The lowering speeds of 4, 33 can be freely controlled.

Next, the operation of the thus-configured closed forging die apparatus will be described.

In forming the work 15, the work 15
Pressure control means 4 according to the material and the shape of the molded product.
The closing load of the upper and lower closing dies 14, 33 is set by adjusting the pressure of the hydraulic cylinder 39 by 0.

Next, when the cylindrical work 15 is vertically accommodated in the cavity 33b of the lower closing die 33 with the slide 2 stopped at the top dead center, the forging press machine is started to start the forming. .

Since a hydraulic press is used as the forging press, the slide 2 starts to descend from the top dead center by a hydraulic cylinder (not shown) provided in the forging press.

Then, when the slide 2 is lowered to a position shown on the left half from the center line O in FIG. 5, the upper blocking die 14 of the upper die set 3 becomes the lower blocking die 33 of the lower die set 5.
The cavities 14b and 33b in the upper and lower closing dies 14 and 33 are closed by contact with the upper surface, and at the same time, the tip of the operating rod 12 protruding downward from the upper base 6 is controlled by the control cam 24.
It comes into contact with the upper surface of the control pad 37 provided above from above.

Thereafter, the upper closing die 14 is connected to the pressure control means 40.
Closing die 3 while maintaining the closing load set by
3 and the upper punch 8 and the lower punch 1
The work 15 in the cavities 14b and 33b is pressurized in the vertical direction during the interval 8 to start forming the work 15.

Also, the operating rod 12 is lowered together with the upper punch 8 to push down the control pad 37, so that the differential means 20 is used.
Is also started as follows.

That is, the control pad 37 is operated by the operating rod 12.
Is depressed, the control cam 24 fixed to the control pad 37 is lowered against the elastic force of the buffer 27, whereby the cam of the receiving cam 22 is moved to the right half from the center line O in FIG. Slide cam 2 guided by surface 22a
3 is moved in the direction of arrow A while being lowered.

The cam surface 23b of the slide cam 23 is in contact with the cam surface 25a of the closing cam 25 fixed to the closing pad 30 to which the closing load is applied. Since the inclination angle of the cam surface 23b of the slide cam 23 is set in advance so that the lowering speed of the closing pad 30 becomes, for example, に 対 し て with respect to the lowering speed of the upper punch 8, the arm 10 and the closing pad 30 The lowering speed of the upper and lower closing dies 14, 33 held between them is
The speed is reduced to half of the lowering speed of the upper punch 8.

As a result, the lowering amount of the upper punch 8 is twice as much as the lowering amount of the upper and lower closing dies 14, 33, and the work 15 in the cavities 14b, 33b is pressurized. Therefore, even a molded article having a complicated shape or an irregularly shaped article can be molded with high precision, and a molded article having good quality without underfilling can be obtained.

On the other hand, depending on the material of the work 15 and the shape of the molded product, a more precise molded product can be obtained by finely controlling the lowering speed of the upper and lower closing dies 14, 33 during molding.

That is, in the ordinary closed forging, the upper and lower closing dies 1 are set by the load set by the closing load generating means 38.
Forming is performed between the upper punch 8 and the lower punch 18 with the blocks 4 and 33 closed, and the initially set closing load is maintained until the slide 2 reaches the bottom dead center and the forming is completed. In the case of a molded product or an irregularly shaped product, when the tip of the operating rod 12 lowered together with the upper punch 8 pushes down the control pad 37 to start the operation of the differential means 20, the pressure control means 4
By controlling the hydraulic pressure of the hydraulic cylinder 39 according to 0 and controlling the load balance between the hydraulic cylinder 39 and the differential means 20, the upper and lower closing dies 1
The lowering speed of 4, 33 is adjusted to a speed suitable for the shape of the molded product.

As a result, a fiber flow corresponding to the shape of the molded product can be obtained, so that the fiber flow becomes uniform even in a molded product having a complicated shape or a hetero-formed product.
Molding of a molded article with good quality becomes possible.

In the above embodiment, the lowering speed of the upper punch 8 is controlled by the ram cylinder driving the slide 2, and the lowering speed of the upper and lower closing dies 14, 33 is controlled by the differential means 20.
And the hydraulic cylinder 39, but the ram cylinder and the hydraulic cylinder 39 are mechanically linked by a crank mechanism or the like, so that the upper punch 8 and the upper and lower closing dies 14, 3 are controlled.
3 may be controlled.

[0063]

According to the present invention, as described in detail above, a work closed between the upper closing die and the lower closing die is formed between the upper punch and the lower punch, and is simultaneously installed near the lower closing die. The lowering speed of the upper and lower closing dies is reduced with respect to the lowering speed of the upper punch by operating the differential means with the operating rod which moves down together with the upper punch, and the pressure of the closing load generating means provided on the upper closing die is reduced. By controlling the lowering speed of the upper and lower closing dies by controlling by the pressure control means, when molding a molded article having a complicated shape or a hetero-formed product, the lowering speed of the upper and lower closing dies is controlled. By controlling the flow of the raw material, high-precision molding can be performed, and a high-quality molded product free from underfill or the like can be obtained.

Further, since the cavity of the upper and lower closing dies can be maintained at the center of the height of the workpiece formed between the upper punch and the lower punch, the fiber flow is uniform, and high quality molding with high molding accuracy is achieved. Product is obtained,
The blockage load generating means is composed of a hydraulic cylinder that sets the blockage load of the upper and lower blockage dies, and a pressure control valve that controls the pressure of the hydraulic cylinder. By doing
Since the flow of the material in accordance with the material and shape of the molded article becomes possible, high-precision molding becomes possible, and a molded article of good quality with no underfill or the like can be obtained.

Further, the differential means is brought into contact with the control cam pressed down by the operating rod and urged upward by the buffer means, and the cam surfaces of the control cam and the receiving cam, and lowered with the lowering of the control cam. Since the slide cam is configured to include a slide cam that retreats and a closing cam that is provided on the lower closing die side and abuts on a cam surface of the slide cam to reduce the lowering speed of the upper and lower closing die, the sliding cam descends with the upper punch. Since the differential means can be reliably operated by the operating rod, the reliability is high, and since the configuration is simple, the differential means can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a closed forging die apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the closed forging die apparatus according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is an operation explanatory view of the closed forging die apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 8 upper punch 12 operating rod 14 upper closing die 15 work 18 lower punch 20 differential means 22 receiving cam 22a cam surface 23 slide cam 23b cam surface 24 control cam 24a cam surface 25 closing cam 27 buffer means 33 lower closing die 38 closing load Generating means 39 Hydraulic cylinder 40 Pressure control means

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ryu Takase 1370 Onna, Atsugi-shi, Kanagawa Prefecture F-term in Unisia Gex Co., Ltd.

Claims (3)

[Claims] 1. An upper closing die which can be raised and lowered, a lower closing die which is installed below the upper closing die and closes a work between the upper closing die and the upper closing die and the lower closing die. The upper punch and the lower punch, each of which is provided with the upper and lower closing dies, and which is formed in the vicinity of the lower closing die, and is operated by an operating rod that descends together with the upper punch. A closed forging die apparatus comprising a differential means for reducing a lowering speed of the upper and lower closing dies with respect to a lowering speed of the punch, wherein a closing load generating means for setting a closing load to the upper closing die. Along with providing, the closing load generating means,
A closed forging die apparatus, further comprising pressure control means for controlling a lowering speed of the upper and lower closing dies. 2. The closed forging according to claim 1, wherein said closed load generating means comprises a hydraulic cylinder for setting a closed load of said upper and lower closing dies, and a pressure control valve for controlling a pressure of said hydraulic cylinder. Mold equipment. 3. The control means, wherein said differential means is pressed down by said operating rod and urged upward by a buffer means and a cam surface of said control cam and said receiving cam, and
A slide cam that retreats while descending with the lowering of the control cam; and a closing cam that is provided on the lower closing die side and abuts on a cam surface of the slide cam to reduce the lowering speed of the upper and lower closing die. The closed forging die apparatus according to claim 1 or 2, which is constituted by: