JP2003211252A - Forging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a galling at the time of insertion to a molding die by making a cutting plane of a bar shaped material flat, and to minimize a temperature drop of the bar-shaped material, and to secure the heating range of the bar-shaped material sufficiently, regarding a forging device. <P>SOLUTION: A cutting and a transport means are separately independent cutting mechanisms and transport mechanisms. By providing a blade of a cutter installed in the cutting mechanism over a circumferential direction, a cut surface of the bar-shaped material W is made flat, and a galling at the time of insertion to a molding die of the bar-shaped material W is eliminated. A heating element 3 is arranged in order to heat a practical length of the cutting range of the bar-shaped material. A temperature drop of the bar-shaped material W is controlled, a screw head is formed efficiently, and a throughput of the forming process is improved. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging machine for automatically supplying a forging material cut from a rod-shaped material to a forming die and performing forging by warm or hot, and particularly heads such as screws and bolts. The present invention relates to a forging device suitable for forging.

[0002]

2. Description of the Related Art Conventionally, in the case of warm or hot forging of the head of a screw or bolt, as shown in FIG. 11, the head has a diameter substantially equal to the shaft diameter of the screw or bolt to be manufactured. A rod-shaped material (or wire) W is prepared, and the rod-shaped material W is conveyed in the axial direction by a conveyance means, for example, a feed roller 1 (A), and is distributed in the main body 2 of the forging machine during the conveyance. The rod-shaped material W is heated to a predetermined temperature by a heating element (usually a high-frequency induction heating coil) 3 provided, and after being heated to a predetermined temperature, it is conveyed in the axial direction by a feed roller 1 and heated by the heating element 3 The temperature of the material W is measured by the temperature sensor 9, and if the temperature is equal to or higher than the set temperature, the support member 4 arranged on the front side in the transport direction of the rod-shaped material W as it is.
The rod-shaped material W is brought into contact with the tip of the to stop its movement (B). After that, the cutting / transporting device 5 is moved to cut the rod-shaped material W into a predetermined length to form a forging material B. The forging material B is directly cut by the cutting / transporting device 5 in the main body portion 2 of the forging / forming device. (C), the forging material B is inserted into the forming die 7 by the forward movement of the punch 6 provided in the mechanical portion (not shown) of the forging forming device, and at the same time, the punching material B is tapped. The cutting / transporting device 5 is moved to the original position and one end of the forging material B is installed at a stretch to form a molded body P having a head (a dish-shaped head in the figure) H (D).

If necessary, the punch 6 and the finishing punch (not shown) may be instantaneously switched, and the finishing punch may be used for finish molding. The operation of such a forging machine is disclosed, for example, in the section of the prior art of Japanese Patent Laid-Open No. 10-249475.

[0004]

However, according to the forging of a screw or the like by such a conventional forging device, since the cutting / transporting device 5 has a dual function,
As shown in FIGS. 12 and 13, the cutter 10 for cutting has a substantially semicircular shape.
After cutting the bar, the rod-shaped material W, which became the forged material B, is cut by the cutter 1
It was transferred to the position of the center of the inlet of the molding die 7 while being placed on the width t1 portion of 0. Arrow indicates cutting / transfer device 5
Indicates the moving direction of. Since the cutter 10 also serves as a transfer device, the blade portion for actually cutting the rod-shaped material W has a structure smaller than a semicircle.

As a result, since the area of the blade portion is small, it is difficult to flatten the cut surface of the rod-shaped material W, and there is a problem that the molding die 7 is bitten when it is inserted into the molding die 7. Further, in order to effectively heat the rod-shaped material W, when the position of the heating element 3 is adjusted, the rod-shaped material W is
There is a risk of contact with the heating element 3
However, there is a problem that the heating element 3 is damaged when a spark is generated between the two when they come into contact with.

The present invention has been made to solve the above problems, and an object of the present invention is to flatten the cut surface at the time of cutting a rod-shaped material to suppress galling at the time of insertion into a forming die. . It is another object of the present invention to provide a forging device that prevents the heating element from being damaged even if the rod-shaped material comes into contact with the heating element during the work of adjusting the installation position of the heating element.

[0007]

In order to achieve the above-mentioned object, the present invention comprises a conveying means for conveying a rod-shaped material in the axial direction of the rod-shaped material, a heating element for heating the rod-shaped material, and the conveying means. A supporting member that receives the conveyed rod-shaped material, and a cutting / transportation that cuts the rod-shaped material received by the supporting member into a predetermined length to form a forged material and transfers the forged material to a forming position. In a forging forming apparatus comprising a means and a forming die for forming the tip of the forging material transferred to the forming position by the cutting / transferring means, the cutting / transferring means transfers the cutting mechanism and the independent cutting mechanism. The cutting mechanism cuts the rod-shaped material into a predetermined length, and then the rod-shaped material is transferred to the transfer mechanism and transferred to the center position of the inlet of the molding die by the transfer mechanism. Characterize. Moreover, after the rod-shaped material is cut into a predetermined length by the cutting mechanism, the rod-shaped material is transferred to an extrusion mechanism, and then transferred to the transfer mechanism by the extrusion mechanism. Further, the extrusion mechanism section is characterized in that the rod-shaped material after cutting is transferred to the transfer mechanism side by the operation of the cylinder. Further, the cylinder is equipped with a spring and is operated in conjunction with a cam. Further, the cutting mechanism is characterized by including a cutter having a blade extending in a circumferential direction. Also,
The heating element may be a high frequency induction heating coil, and the protective film may be ceramics. Also,
It is characterized in that the high-frequency induction heating coil is formed of a hollow, substantially rectangular pipe.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view schematically showing a main part of a forging-molding apparatus according to the present invention and a schematic view sequentially showing aspects of the forging-molding. In addition, the main forging forming apparatus is shown in FIG.
Since the schematic structure of the forging-molding apparatus shown in FIG. 11 is the same as the schematic structure, the same parts as those shown in FIG. 11 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, similar to the one shown in FIG. 11, the heating element 3 for heating the rod-shaped material (bar material or wire material) W conveyed by the feed roller 1 is the main body 2 of the forging machine. More specifically, the heating element 3 is installed inside, and more specifically comprises a high frequency induction heating coil. The high frequency induction heating coil 3 is supplied with a high frequency current from an output transformer (not shown), The inserted rod-shaped material W is heated. Further, the mechanism section 8 includes
A heater 16 for heating the punch 6 and a finishing punch (not shown) used by switching the punch 6 and a heater 17 for heating the molding die 7 are provided on the main body 2. ing. These heaters 16,
The output of 17 is controlled by a controller (not shown). Normally, punch 6, finishing punch,
The temperature of the molding die 7 is controlled to be 70 to 120 ° C.

Hereinafter, the forging of the screw head by the forging device of the present application will be described with reference to FIG. At the time of forging, the feed roller 1 conveys the rod-shaped material W in its axial direction, stops the tip of the rod-shaped material W at a position where it does not go out of the heating range of the high-frequency induction heating coil 3, and is supplied from the output transformer. The high-frequency induction heating coil 3 is heated by the high-frequency current, and the rod-shaped material W also has a predetermined temperature (in the case of a titanium alloy material, it varies depending on the diameter of the material, but about 500
(-550 degreeC) (A). When the rod-shaped material W is heated to a predetermined temperature, the feed roller 1 conveys the rod-shaped material W in its axial direction, and the temperature sensor 9 measures the rod-shaped material W. , The supporting member 4 arranged as it is on the front side in the transport direction of the rod-shaped material W.
The rod-shaped material W is brought into contact with the tip of the to stop its movement (B).

Next, the cutting device 12, which is a cutting mechanism, operates to move the rod-shaped material W to a predetermined length, that is, 22 in this embodiment.
The rod-shaped material W cut into mm is cut into a forged material B, and the transfer device 13 that is a transfer mechanism installed on the side surface of the cutting device 12 is operated to form the forged material B as indicated by an arrow. It moves to the position of the center of the entrance of the die 7, and waits until the punch 6 moves (C).

Then, in response to the transfer completion signal, the punch 6 provided in the mechanism portion 8 advances as shown by an arrow to insert the forging member B into the forming die 7 and tap it, and then the punch 6 is punched.
And the finishing punch (not shown) are switched instantly,
The finishing punch inserts the forging material B into the forming die 7 and taps it, thereby forming a body having a head H (screw body).
P is molded. After the finishing punch inserts the forging material B into the forming die 7 and beats it, the punch 6 and the finishing punch return to their original positions. On the other hand, the transfer device 13 operates immediately after the punch 6 inserts and taps the forging material B into the forming die 7, and returns to the original position as indicated by the arrow (D).

Then, the feed roller 1 is rotated by the return signal to the original position, and the rod-shaped material W is conveyed again,
At the same time, the cutting device 12 operates to cut the rod-shaped material W into a predetermined length, and thereafter, the above steps are repeated.

As the present embodiment, the operation in FIG. 1C will be described in more detail with reference to FIGS. The rod-shaped material W after heating contacts the tip of the supporting member 4 and stops (FIG. 2). Then, the rod-shaped material W inserted into the central hole 20 of the circular cutter 14 attached to the cutting device 12, which is a cutting mechanism, is cut into a predetermined length by the cutter 14,
The cut rod-shaped material W becomes a forged material B, and the forged material B is placed on the width t2 portion of the cutter 14 and transferred to the position of the blank extrusion mechanism 19 as shown by the arrow (FIG. 3). Then, the cylinder 2 of the blank extrusion mechanism 19
1 operates as shown by an arrow to pass through the central hole 20 of the cutter 14 to push the forging material B forward from the cutting device 12 (FIG. 4). A spring (not shown) is inserted into the cylinder 211, and the cylinder 21 is extruded by a cam (not shown) interlocked with the machine, and after the forging material B is extruded, it is returned to a predetermined position by a spring force. Has become. The cylinder 21 may be extruded by air. At the same time as the forging material B is pushed forward from the cutting device 12, the transfer device 13 which is a transfer mechanism installed on the side surface of the cutting device 12 is activated to move the transfer arm 2
The forging material B is transferred to the position of the center of the entrance of the forming die 7 by 2 and waits until the punch 6 moves (FIG. 5). It should be noted that the cylinder 21 returns to the original position at the same time when the transfer arm 22 transfers the forging material B, and the cutting device 12 also returns to the original position by the completion signal to the original position of the cylinder 21.

FIGS. 6 and 7 show an outline of the cutting device 12 which is the cutting mechanism in the present embodiment and the shape of the cutter 14 provided in the cutting device 12. A circular cutter 14 having a blade extending in the circumferential direction is fixed to the base portion 15 with a mounting screw 18 at the center of the cutting device 12, and a rod-shaped material W is inserted into a central hole 20 of the cutter 14. , Cutter 1
The rod-shaped material W is cut into a predetermined length by moving 4 so as to intersect with the rod-shaped material W at a right angle. In addition, since the cut bar-shaped material W is placed on the width t2 of the cutter 14, it is necessary to replace the cutter 14 for each cut length as necessary. There is no need to replace it as long as the length can cover it. The arrow in the figure indicates the moving direction of the cutting device 12.

FIG. 8 shows an outline of the main part of the transfer device 13 which is the transfer mechanism in this embodiment. FIG. 8 is a view of the transfer device 13 viewed from the inlet direction of the molding die 7.
It consists of a pair of transfer arms 22, and sandwiches a forged member B, which is a bar-shaped material W cut at the tip of the transfer arm 22,
Transfer to the center of the entrance of the molding die 7. The adjustment bolt 23 is a bolt for adjusting the sandwiching condition of the transfer arm 22.

The structure of the heating element 3 according to this embodiment is shown in FIGS. The heating element 3 is a high frequency induction heating coil, and the coil is formed by a hollow pipe 24 made of copper, and the surface of the heated portion is made of alumina, which is ceramics, as a protective film 25 so that the film has a thickness of about 1 to 2 mm. It has been subjected. The heating length of the conventional high-frequency induction heating coil 3 is about 30 mm, but in the present embodiment,
The heating length of the high frequency induction heating coil 3 is about 60 mm, the coil inner diameter is about 14 mm and the coil outer diameter is about 35 mm. In particular, although the heating length is made longer than in the conventional case, by increasing the heating length of the high frequency induction heating coil 3, the rod-shaped material W can reach a predetermined temperature in a short time, and the rod-shaped material W is heated. By increasing the range
This is because the temperature decrease of the rod-shaped material W can be suppressed. In addition,
When there is a concern that the heating length of the high-frequency induction heating coil 3 is increased, the main unit 2 is affected by heat.
A thermal effect can be suppressed by arranging a hollow pipe (not shown) in the above and cooling water by flowing cooling water through the main body 2.

The reason why the protective film 25 is provided on the high-frequency induction heating coil 3 is that the rod-shaped material W touches the high-frequency induction heating coil 3 during adjustment of the set position of the high-frequency induction heating coil 3 or conveyance of the rod-shaped material W. However, since it does not spark, damage to the high frequency induction heating coil 3 can be prevented. The high-frequency induction heating coil 3 is made of copper and is composed of a hollow pipe having a substantially circular cross section, but it is preferable that the high frequency induction heating coil 3 is made of a hollow pipe having a substantially quadrangular cross section. Since this substantially quadrangular pipe allows more cooling water to flow in the pipe than the substantially circular pipe, stable heating is possible, and there is an advantage that the rod-shaped material W can be heated in a short time.

In the present embodiment, the protective film 25 is made of alumina, but it may be coated with other ceramics, and is limited to this as long as it can prevent damage to the high frequency induction heating coil 3. Needless to say, it may be formed of zirconia, for example.

In the present embodiment, the case where the molded body (screw shaped body) P is forged is shown, but it is needless to say that the present invention can be applied to the forged molding of bolts and nuts. The punch and molding die must be replaced. In the present embodiment, the mechanism portion 8 has a heater 16 and a main body portion 2 for heating the punch 6 and a finishing punch (not shown) which is used by switching to the punch 6.
A heater 17 for heating the forming die 7 is provided in the punch 6 to further prevent the temperature of the forging material B from decreasing when the punch 6 inserts and strikes the forming die 7.
The forging material B is not cracked due to the temperature drop of the forging material B at the time of insertion and tapping into the forming die 7 by
The heaters 16 and 17 can be omitted if the thread can be molded.

In the present embodiment, the heating length of the high-frequency induction heating coil 3 is made longer than in the conventional case, so that the heated range of the rod-shaped material W becomes longer, resulting in a decrease in the temperature of the rod-shaped material W. Since it has been confirmed that cracks and the like do not occur in the forging material B due to the temperature drop of the forging material B when the punch 6 inserts and strikes the molding die 7, it is possible to eliminate the heaters 16 and 17. When the heaters 16 and 17 are eliminated, the number of parts can be reduced, so that the cost of the forging machine can be reduced.

[0022]

As described above, according to the forging / molding apparatus of the present invention, the cutting / transporting means has the independent cutting mechanism and transporting mechanism, and the blade of the cutter provided in the cutting mechanism is used. By providing it in the circumferential direction, the cut end of the rod-shaped material becomes flat, and it is possible to improve the problem of biting the molding die when inserting it into the molding die,
It is possible to suppress a decrease in the life of the molding die. Also, since a ceramic coating is applied to the surface of the heating element as a protective film,
Since there is a remarkable effect that the heating element can be prevented from being damaged even when the rod-shaped material comes into contact with the heating element,
Efficient manufacturing is possible. Further, by making the heating length of the heating element longer than in the conventional case, the rod-shaped material W can reach a predetermined temperature in a short time, and the heated range of the rod-shaped material W becomes longer, so that the temperature of the rod-shaped material W becomes higher. As a result of suppressing the decrease, the screw head can be efficiently formed, and the processing capacity of the screw head forming process can be improved, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic view schematically showing a main part of a forging-molding apparatus according to the present invention, and a schematic view sequentially showing aspects of the forging-molding.

FIG. 2 is a schematic diagram showing a detailed mode of FIG. 1 (C).

FIG. 3 is a schematic view showing a detailed aspect of FIG. 1 (C).

FIG. 4 is a schematic diagram showing a detailed mode of FIG. 1 (C).

FIG. 5 is a schematic view showing a detailed mode of FIG. 1 (C).

FIG. 6 is a plan view for explaining a cutting device and a cutter shape in the forging device according to the present invention.

7 is a diagram showing a front view of FIG.

FIG. 8 is a diagram showing an outline of a main part of a transfer device in the forging device according to the present invention.

FIG. 9 is a view showing a heating element in the forging device according to the present invention.

10 is a diagram showing a side view of FIG. 9. FIG.

FIG. 11 is a schematic view schematically showing a main part of a conventional forging-molding apparatus and a schematic view sequentially showing aspects of the forging-molding.

FIG. 12 is a plan view showing an outline of a cutting / transferring device in a conventional forging forming device.

13 is a front view of the cutting / transferring device shown in FIG. 12. FIG.

[Explanation of symbols]

1 Feed roller (conveying means) 2 body 3 High frequency induction heating coil (heating element) 4 Support members 5 Cutting and transfer device 6 punches 7 Molding die 8 mechanical parts 9 Temperature sensor 10 cutter 12 cutting device 13 Transfer device 14 cutter 15 Base 16 heater 17 heater 18 Mounting screw 19 Blank extrusion mechanism 20 Central hole 21 cylinders 22 Transfer arm 23 Adjustment bolt 24 pipes 25 Protective film W bar material B Forging material P molded body H head

Continued front page    F-term (reference) 4E087 AA05 BA17 CA11 CA31 CB01                       CB02 CC01 DB03 DB15 DB22                       FA07 FB02 FB06 HA53 HA56

Claims (12)

[Claims] 1. A conveying means for conveying a rod-shaped material in the axial direction of the rod-shaped material, a heating element for heating the rod-shaped material, a supporting member for receiving the rod-shaped material conveyed by the conveying means, and the support member. The rod-shaped material received by the above is cut into a predetermined length to form a forged material, and the forging material is transferred to a forming position by a cutting / transfer means and a cutting / transfer means. In the forging forming apparatus provided with a forming die for forming the tip of the forged material, the cutting / transporting means is composed of an independent cutting mechanism and a transporting mechanism, and the rod-shaped material is moved to a predetermined length by the cutting mechanism. After the cutting, the rod-shaped material is transferred to the transfer mechanism, and is transferred to the center position of the inlet of the molding die by the transfer mechanism. 2. The cutting mechanism cuts the rod-shaped material into a predetermined length, and then the rod-shaped material is transferred to an extruding mechanism, and the extruding mechanism transfers the rod-shaped material to the transfer mechanism. Item 1. The forging device according to item 1. 3. The forging machine according to claim 2, wherein the extrusion mechanism transfers the rod-shaped material after cutting to the transfer mechanism side by the operation of the cylinder. 4. The forging machine according to claim 3, wherein the cylinder is provided with a spring and operates in conjunction with a cam. 5. The forging machine according to claim 3, wherein the cylinder is operated by air. 6. The forging apparatus according to claim 1, wherein the cutting mechanism includes a cutter having a blade extending in a circumferential direction. 7. The forging apparatus according to claim 1, wherein the heating element comprises a high frequency induction heating coil, and a protective film is formed on a surface of the high frequency induction heating coil. 8. The forging apparatus according to claim 7, wherein the protective film is made of ceramics. 9. The forging apparatus according to claim 8, wherein the ceramic is selected from alumina and zirconia. 10. The forging machine according to claim 7, wherein the high-frequency induction heating coil comprises a hollow pipe having a substantially rectangular shape. 11. The forging machine according to claim 1, wherein the forging machine is used for molding a head of a screw or a bolt. 12. The forging machine according to claim 1, wherein the forging machine is used for molding a nut.