JP2521907Y2 - Mold for pressure forming machine - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, a material is pressed into a product having a predetermined shape by using a mold provided on a machine base and a mold provided on a ram moving forward and backward with respect to the machine base. The present invention relates to an improvement of the above-mentioned mold in a forging machine.

[0002]

2. Description of the Related Art Bolts, nuts, and other various shaped parts are formed by pressing a material by a mold provided on a machine base and a mold provided on a ram moving forward and backward with respect to the machine base. In a press forming machine for press forming a die, a die or a punch having a predetermined shape is provided in the above-described die. In particular, a die provided with the die has conventionally had the following configuration.

That is, as shown in FIG. 6, this type of mold 1 is inserted into a mounting hole 2 provided at a predetermined position of a machine stand or a ram, and is fixed in the hole 2 by a fixing bolt 3. Die shrink case 4 as a mold body fixed to
And a die 5 fitted and fixed to the hole 4a provided at the tip of the case 4 by shrink fitting or the like. As shown in the figure, the pressure receiving member 6 on the back of the die 5 and the insert member 7 in the die 5 are fitted as required, and a knockout pin 8 penetrating therethrough is provided.

[0004]

[Problems to be Solved by the Invention] By the way, the above-mentioned mold 1
The dies 5 are worn out over a long period of use and may be damaged due to excessive load, so that the dies 5 are replaced regularly or as needed. The die 4 is extracted from the hole 4a of the case 4 using a hydraulic press or the like, and a new die 5 is inserted into the hole 4a.
It will be inserted into the device by shrink fitting or the like.

The case 4 is formed of a material having a relatively small hardness (for example, about 50 in HRC hardness) so that the die 5 can be easily pulled out and fitted at that time. When the case 4 is made of a material having a relatively small hardness,
As shown exaggeratedly by the chain line in FIG. 6, the trunk may expand and seize on the inner surface of the mounting hole 2 on the machine stand or ram side. In this case, the case 4 is pulled out from the mounting hole 2. Is extremely difficult.

Accordingly, an object of the present invention is to facilitate the exchange of dies in a die of the above-mentioned forging machine. The second object is to extend the life of the die to twice, and when a counter punch constituting the bottom surface of the cavity is provided in the die, the front and rear positions thereof are adjusted with a simple configuration. It is a third task to obtain it.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is characterized in that it is configured as follows.

First, the invention according to claim 1 of the present application (hereinafter, referred to as the invention)
The first invention) is a fixed mold provided on the machine base,
In a forging molding machine that presses a material by a movable mold provided on a ram that reciprocates so as to approach and separate from the machine base to form a product of a predetermined shape, At least one of the molds comprises a mold body attached to a machine stand or a ram, and a die shrink case detachably attached to a tip of the body to hold a die. It is characterized by being formed of a material having a higher hardness than the shrink case.

According to a second aspect of the present invention, at least one of a fixed side and a movable side is attached to a machine base or a ram, as in the first aspect. Mold body, and a die shrink case that is detachably attached to the tip of the body to hold a die, and that the mold body is formed of a material having a higher hardness than the die shrink case, Forming cavities are provided on both the front and back surfaces of the die held in the die shrink case, and the case is attached to the mold body with one of the surfaces facing the mating mold, so that the cavity on that surface is formed. It can be selectively used.

[0010] Further, the invention according to claim 3 (hereinafter referred to as a third invention).
In the same manner as in the first invention, at least one of the molds on the fixed side and the movable side is detachably attached to the mold body attached to the machine base or the ram, and to the tip of the body. And a die shrink case for holding the die, and the mold main body is formed of a material having a higher hardness than the die shrink case, and the tip of the die body protrudes into the die. The counter punch constituting the bottom surface of the molding cavity is inserted so as to be able to move back and forth, and further, is disposed behind the counter punch and screwed to the mold body to receive a load acting on the punch. And a counter punch adjusting member for rotating the counter punch to adjust the front / rear position thereof.

The invention according to claim 4 (hereinafter referred to as a fourth invention)
In the first, second and third inventions, the die body is formed of a material having an HRC hardness of about 60, and the die shrink case is formed of a material having an HRC hardness of about 50. It is characterized by.

[0012]

According to the above construction, in any of the first to fourth inventions, the die is divided into the main body attached to the machine stand or the ram and the die shrink case holding the die. When replacing the die, the die shrink case is removed from the mold body, and then the die is extracted from the case. Therefore,
It is not necessary to remove the pressure receiving member, the insert member, and the like incorporated in the mold body prior to removing the dice as in the related art.

In particular, since the die shrink case is made of a material having relatively low hardness (for example, about 50 in HRC hardness), it is easy to remove the die from the case and insert a new die. It will be.

On the other hand, since the mold body is made of a material having relatively high hardness (for example, about 60 in HRC hardness), there is no deformation such that the body expands even after long-term use. Therefore, when the dies are replaced, the dies can be easily removed from the mounting holes of the machine stand or the ram.

According to the second invention, when the cavity formed on one surface of the die is worn or damaged, the die shrink case holding the die is removed from the mold body. After that, if this is turned over and attached to the mold body again, the product can be formed again using the cavity that has not been worn or damaged at all, while using the same die or die shrink case. Shrink case life is 2
It will be doubled.

According to a third aspect of the present invention, for the purpose of fine adjustment of the axial dimension of a product, a counter punch having a tip portion protruding into the die and forming a bottom surface of a molding cavity in a mold body. When is inserted so as to be able to move back and forth, since the mold body is formed of a material having high hardness, an adjusting member for receiving the load acting on the counter punch and adjusting the front and rear position of the punch is provided. Just by screwing it to the mold body behind the punch, the above-mentioned load can be sufficiently endured. As a result, a mechanism for adjusting the front / rear position of the counter punch, which has a simple structure simply by rotating the adjusting member, can be obtained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a head forming machine 10 according to the present embodiment is for producing bolts. The head forming machine 10 includes a material cutting station 20 and first and second head forming stations. 30 and 40 and a thread rolling station 50 are provided.

The material cutting station 20 includes a fixed blade 21 for fixing a wire A supplied from the outside to the machine base 11.
And a movable blade 22 relatively moving with respect to the fixed blade 21 to form a material B having a predetermined length, and the material B is firstly moved by a transport mechanism (not shown).
It is supplied to the forging station 30.

In the first forging station 30, a fixed mold 31 fixed to the machine base 11 and a movable ram (not shown) provided on a ram (not shown) reciprocatingly moving toward and away from the machine base 11. With the side mold 32, the material B is forged to form a first intermediate product C having a head and a shaft, and the first intermediate product C is transported by the transfer mechanism to a second forging station. 40.

In the second forging station 40, the head and shaft of the first intermediate product C are formed by a fixed mold 41 provided on the machine base 11 and a movable mold 42 provided on the ram. The parts are finished to a final shape to form a second intermediate product D, which is also supplied to the thread rolling station 50 by the transport mechanism.

In the thread rolling station 50, a disk-shaped rotary blade 51 provided with a cutting blade on the outer peripheral surface is provided.
And the fixed blade 52 fixedly provided on the outer periphery thereof at a predetermined gap and having an arc-shaped inner peripheral surface as a cutting blade,
A male screw is formed on the shaft of the intermediate product D, whereby a bolt E as a final product is formed.

Next, the fixed-side and movable-side molds 3 in the first forging station 30 having the configuration of the characteristic portion of the present invention.
The structures 1 and 32 will be described.

FIG. 2 shows the stationary mold 31. The mold 31 is divided into a cylindrical mold body 51 and a disk-shaped die shrink case 52 attached to the front end surface thereof. These are connected and integrated by a connecting bolt 53.

In this embodiment, the mold body 51 is made of a material having a hardness of 60 with HRC hardness, and a die shrink case 52.
Is formed using a material having an HRC hardness of 48.

The mold body 51 is fitted in a mounting hole 11 a provided in the machine base 11, and is fixed by a fixing bolt 13 with its rear end face being received by a load receiving member 12. Dice shrink case 5
A die 54 is fitted and fixed to the tapered hole 52a at the center of 2 by shrink fitting or the like.

A stepped portion 51a is formed at the front end of the mold body 51, and a die receiving member 55 for supporting a load acting on the die 54 is press-fitted into the stepped portion 51a. A counter punch 56 penetrating the die receiving member 55 and the die 54 is provided, and the front end face of the counter punch 56 and the inner peripheral surface of the die 54 correspond to the shape of the shaft portion of the first intermediate product C mainly. A cavity 57 is formed.

A counter punch adjusting member 58 is screwed into a screw hole 51b at a rear end of the mold body 51, and a rear end of the counter punch 56 is connected to a front end surface of the counter punch 56 via a slide member 59. Thus, when fine adjustment of the axial dimension of the product is performed, the adjustment member 58 is rotated to adjust the front-rear position of the counter punch 56 via the slide member 59, so that the cavity 57 is formed. The front end face of the counter punch 56 constituting the bottom surface can be set at a desired position with high accuracy.

A knockout pin 60 is provided to penetrate the adjusting member 58,
When the forging operation at 0 is completed, the knockout pin 60 is moved forward via the relay pin 61 by the driving mechanism (not shown), so that the die is formed via the slide member 59 and the counter punch 56. The first intermediate product C in the portion 54 is extruded.

Here, as shown in FIG. 2 and FIG. 3, the rear end face of the adjusting member 58 is cut in a cross shape in a cross shape.
a are formed, and the cut grooves 58a, 58a
A sleeve 62 having a projection 62a... 62a at the distal end thereof is rotatably provided. By rotating the sleeve 62 by a driving mechanism (not shown), the adjustment member 58 is rotated to rotate the counter member. The front and rear positions of the punch 56 are adjusted.

As shown in FIG. 4, the movable mold 32 is also divided into a cylindrical mold body 71 and a disk-shaped die shrink case 72 attached to the front end face thereof. These are connected and integrated by a connecting bolt 73. The die body 71 is attached to the ram 15 which approaches and separates from the machine base 11, and a central hole 72a of the die shrink case 72 is provided.
The die 74 is fitted and fixed by shrink fitting or the like.

Here, in the movable mold 32 as well,
The die body 71 is formed using a material having a hardness of 60 in HRC hardness.
It is formed using a material having an RC hardness of 48.

A counter punch 75 extends through the die 74 and the front end face of the main body 71. The front end face of the counter punch 75 and a concave portion provided on the front face of the die 74 form the first intermediate product C. A cavity 76 corresponding to the shape of the head is formed.

As in the case of the fixed mold 31 described above, the counter punch adjusting member 77 is screwed into the screw hole 71a at the rear end of the mold body 71, and slides on the front end face thereof. The rear end of the counter punch 75 is received via the member 78, whereby the front / rear position of the counter punch 75 can be adjusted via the slide member 78 by rotating the adjusting member 77. It has become.

A knockout pin 79 is provided to penetrate the adjusting member 77, and
0, the knockout pin 79 is moved forward by the drive mechanism (not shown) through the relay pin 80, and the die is formed through the slide member 78 and the counter punch 75. The first intermediate product C in 74 is extruded.

The movable mold 32 also has a cross-shaped groove 77a on the rear end surface of the adjusting member 77.
Is formed. By rotating the adjusting member 77 via a sleeve 81 having a projection 81a... 81a at the front end portion engaging with the cut grooves 77a, 77a, the front-rear position of the counter punch 75 is adjusted. Has become.

In the movable mold 32,
As shown in an enlarged view in FIG. 5, the die shrink case 72 has the same shape on the front side 72 ′ and the back side 72 ″, and the counterbore for accommodating the head of the bolt 73 for coupling to the mold body 71. The same parts are formed on the front and back of the parts 72b 'and 72b ". In addition, the dies 74 held by the case 72 are also provided on the front and back surfaces with the cavity forming recesses 7 having the same shape.
4 ', 74 "are formed.

Next, the operation of the above embodiment will be described.

When the forging machine 10 operates, the material B formed at the material cutting station 20 shown in FIG. 1 is sequentially supplied to the first and second forging stations 30, 40 and the screw rolling station 50, By performing the first and second stages of the forging process and the thread rolling process, a bolt E as a final product is formed. However, when a large number of products are manufactured in this way, The dies and blades at each station will be worn and damaged. Therefore, the work of exchanging dies and the like at each station is required. In the first forging station 30, the work of exchanging dies is performed as follows.

First, in the case of the fixed mold 31, the fixing bolt 13 is loosened and the mold body 51 is attached to the mounting hole 1 of the machine base 11.
The die body 51 and the die shrink case 52 are separated from each other by removing the bolts 53 for connection. And the hole 52a of the die shrink case 52
After the die 54 inserted into the hole 52a is extracted using a hydraulic press or the like, a new die 54 is inserted into the hole 52a by shrink fitting or the like. Then, the connecting bolt 53
The die shrink case 52 in which the die 54 has been replaced with a new one is connected to the mold main body 51 by using this, and then the mold main body 51 is fitted into the mounting hole 11a of the machine base 11 again, and the fixing bolt 13 will be fixed.

Accordingly, it is not necessary to disassemble the die receiving member 55, the counter punch 56, the adjustment member 58, the slide member 59, and the like incorporated in the mold body 51.

In particular, since the die shrink case 52 is made of a material having a relatively small HRC hardness of 48, it is easy to remove the die 54 from the case 52 and fit a new die 54 therein. Will be done. Further, since the mold body 51 is formed of a material having a relatively high hardness of 60 in HRC hardness,
There is no deformation such that the trunk expands even after long-term use.
It can be easily removed from the one mounting hole 11a.

On the other hand, in the case of the movable mold 32, if the cavity forming recess 74 'on one surface of the die 74 in the die shrink case 72 is worn out or damaged due to long-term use, the connecting bolt 73 is removed. The die shrink case 72 may be separated from the mold body 71, and the die shrink case 72 may be turned upside down and coupled to the mold body 71 again with the bolts 73. The forging operation can be started.

If the cavity forming recess 74 "on the back side is also worn out or damaged, the coupling bolt 73 is removed again to separate the mold body 71 from the die shrink case 72. The die 74 inserted into the hole 72a is removed by using a hydraulic press or the like, and is replaced with a new die 74. Then, the die shrink case 72 in which the die 74 is replaced with a new one by using the coupling bolt 73 is used. It will be connected to the mold body 71.

Therefore, with respect to the movable mold 32, the life of the die 74 is doubled and the cavity forming recesses 74 'and 74 "on both sides of the die 74 are disabled. And the mold body 71 is
From the mold body 71,
Of course, disassembly of the counter punch 75, its adjustment member 77, the slide member 78, and the like incorporated therein is not required.

Also in this movable mold 32, since the shrink case 72 is formed of a material having a relatively small hardness, the die 74 can be easily removed from the case 72 and a new die 74 can be easily fitted. In addition, since the mold body 71 is formed of a material having a relatively high hardness, there is no deformation such that the body expands even after long-term use, and the mold body 71 can be easily removed from the ram 15. is there.

Further, in both the fixed mold 31 and the movable mold 32, the front and rear positions of the counter punches 56 and 75 are adjusted by rotating the adjusting members 58 and 77 via the sleeves 62 and 81. At the same time, the loads of the counter punches 56 and 75 are applied to these adjusting members 58 and 77. In this case, the adjusting members 58 and 77 are screwed into the metal. Since the mold bodies 51 and 71 are formed of a material having high hardness,
The screw portion can sufficiently bear the load. As a result, a counter punch adjusting mechanism having a simple configuration as described above is realized.

In the above embodiment, both the fixed mold 31 and the movable mold 32 are divided into the main bodies 51, 71 and the die shrink cases 52, 72, of which the movable die shrink is provided. Both the front and back sides can be used for the case 72. However, only one of the molds may be used as the split mold, and the die shrink case of the split mold can be used for both the front and back sides. It may be.

[0049]

As described above, according to the present invention, when exchanging the dice, the dice shrink case holding the dice is separated from the die body, and the dice fitted in the case is separated. , And a new die may be inserted again by shrink fitting or the like.

Therefore, as in the case of the conventional integrated mold, it is possible to eliminate the trouble of having to remove all the various components incorporated in the main body in order to replace the die. The die shrink case is formed of a material having relatively small hardness, and the mold body is formed of a material having relatively large hardness, so that removal and insertion of the die from the die shrink case are facilitated, The expansion of the body of the mold main body due to long-term use or the like is suppressed, and the problem that removal of the main body from the machine stand or the ram becomes extremely difficult is avoided.

According to the second invention, in addition to the above effects, the life of the die or the die shrink case itself is doubled.

According to the third aspect of the present invention, when a counter punch is provided in the mold body, the hardness of the mold body can be increased, and a counter having a simple configuration is provided. A mechanism for adjusting the front / rear position of the punch is realized.

As described above, according to the present invention, the die exchange operation in this type of forging machine is facilitated, and the cost of the forging machine or the manufacturing cost of various parts using the forging machine is improved. Is effectively reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an entire configuration of a head forming machine according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a stationary mold in the press forming machine of FIG.

FIG. 3 is a sectional view taken along line XX in FIG. 2;

FIG. 4 is an enlarged cross-sectional view of a movable mold in the forging machine of FIG.

FIG. 5 is an enlarged sectional view of a single die shrink case in the movable mold.

FIG. 6 is a longitudinal sectional view of a conventional mold.

[Explanation of symbols]

 11 Machine stand 15 Ram 31 Fixed mold 32 Movable mold 51,71 Mold body 52,72 Dice shrink case 54,74 Dice 56,75 Counter punch 58,77 Adjusting member 74 ', 74 "Cavity forming recess

Claims (4)

(57) [Scope of request for utility model registration] 1. A material having a predetermined shape is formed by pressing a material by a fixed-side mold provided on a machine base and a movable-side mold provided on a ram that reciprocates so as to approach and separate from the machine base. A mold in a pressure forming machine for molding into a product, wherein at least one of a fixed side and a movable side mold is detachably attached to a mold body attached to a machine stand or a ram, and a tip end of the body. A die for a forging molding machine, comprising: a die shrink case attached to hold a die; and a die body formed of a material having a higher hardness than the die shrink case. 2. A material having a predetermined shape is pressed by a fixed-side mold provided on a machine base and a movable-side mold provided on a ram that reciprocates so as to approach and separate from the machine base. A mold in a pressure forming machine for molding into a product, wherein at least one of a fixed side and a movable side mold is detachably attached to a mold body attached to a machine stand or a ram, and a tip end of the body. The die body is formed of a material having a higher hardness than the die shrink case, and the dies held by the die shrink case are formed on both sides. The case has a molding cavity, and the case is mounted on the mold body with one surface facing the other mold, so that the cavity on that surface can be selectively used. A mold for a pressure forming machine. 3. A material having a predetermined shape is formed by pressing a material by a fixed mold provided on a machine base and a movable mold provided on a ram reciprocating so as to move toward and away from the machine base. A mold in a pressure forming machine for molding into a product, wherein at least one of a fixed side and a movable side mold is detachably attached to a mold body attached to a machine stand or a ram, and a tip end of the body. A die shrink case that is attached to hold the die, the mold body is formed of a material having a higher hardness than the die shrink case, and a tip end of the die body protrudes into the die. The counter punch forming the bottom surface of the molding cavity is inserted so as to be able to move back and forth, and is arranged behind the counter punch to receive a load acting on the punch, while being rotated to rotate. A die for a press forming machine, wherein a counter punch adjusting member for adjusting a front and rear position of the counter punch is screwed into a die body. 4. The die body is formed of a material having an HRC hardness of about 60, and the die shrink case is formed of an HRC hardness of 5
The die for a pressure forming machine according to any one of claims 1 to 3, wherein the die is formed of approximately zero material.