JPH0244914Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a hot forging machine for forging in a hot state a coiled material that has been unwound, straightened and heated, for example.

(Prior art) Conventionally, in a hot forging machine for manufacturing nuts, etc. from wire rods, a long straight bar is intermittently drawn and fed by a feed roll installed on the exit side of a heating furnace. It was common to cut the pieces into a predetermined amount and then forge the cut pieces. In this case, since the material is a straight bar, there is a limit to its length, and a considerable length of cut waste material is produced at the joint with the next straight bar, which is uneconomical. For this reason, a device has appeared in which the material is shaped into a coil, unwound, straightened and heated, and then fed to a hot forging machine, as is done in a cold forging machine (Japanese Patent Laid-Open No. 58-38632 Publication No.).

However, although such a device is practical for relatively small-diameter materials with an outer diameter of approximately 10 mm or less, when the material has a large diameter, the straightening machine after unwinding the material must be multi-staged. Moreover, the driving force of the feed roll, which is driven in forward and reverse reciprocation to apply the material feeding force, must necessarily be large, which theoretically requires a huge lever and link mechanism, which is impractical. . Furthermore, it is difficult to directly utilize the hot forging machine at the rear stage of a conventional device for long straight bars and connect the present mechanical means to the front stage. This is because it is impossible to attach a mechanically transmitted shaft to the crankshaft. Furthermore, since the straightened material is retracted upward when the feed rolls are reversed, there is a risk of bending deformation. Furthermore, since the cam link and lever mechanism are used for adjustment control, there is a limit to accuracy. Therefore, a stopper is essential, and it is necessary to adjust the stopper and link when controlling the cutting length. It had the disadvantage of being bad.

Therefore, the present applicants proposed in Japanese Patent Application No. 60-38903 a material feeding device which can eliminate the above-mentioned drawbacks and can be applied to materials ranging from small diameter materials to considerably large diameter materials.

The material supply device in this patent application No. 60-38903 is a forging line consisting of a coil unwinding mechanism 1, a straightening mechanism 2, a feed roll 3, a heating device 4, and a hot forging machine 5. The apparatus is characterized in that it is provided with a control means for extracting the forging timing of the forging machine 5 as an electric signal and controlling a feed roll driving means mechanically independent from the hot forging machine 5 based on the signal, This is an excellent material feeding device that can solve the drawbacks of conventional devices (see Figure 3).

(Problems to be solved by the invention) However, even if the material is supplied to a hot forging machine using the above-mentioned material supply device proposed by the applicant and others and a prescribed forging process is performed, the following problems occur. Subsequent experiments revealed that this problem occurred.

In other words, the amount of roll rotation (rotation angle) of the feed roll 3 for material supply can be controlled accurately and arbitrarily by NC control, etc., but it is difficult to detect the feed amount when the feed roll 3 is worn out due to use. and it is impossible to take measures to correct it. Since the rear end of the coiled material cannot be fed by the feed roll 3, the material must be fed by the feed roll 18 provided in the hot forging machine 5.
Unlike the feed roll 3, the rotation amount of the feed roll 18 cannot be accurately controlled. Therefore, the stopper is installed at the required cutting length position, and when the material comes into contact with this stopper, the feed roll 1
A structure is adopted in which the material is supplied to the required cutting length by forming the cutter 8 to slip.

However, in the method of determining the cutting length by applying the material to a stopper, the cutting length is inaccurate, which adversely affects the quality of subsequent products. etc.

The present invention was developed in view of the above-mentioned problems, and aims to provide a hot forging machine that can cut to an accurate length even when the feed roll is worn or the rear end of a coiled material. It is something to do.

(Means for Solving the Problems) The present invention provides a hot forging machine equipped with at least a straightening mechanism, a heating device, and a cutting device, in which a stopper device is disposed on the material pass line, and the stopper device is supplied. A material receiving metal fitting whose position can be adjusted by a moving mechanism is arranged on the material receiving side, and
The gist of this is that the pressure sensor is fixed to the opposite side of the material receiving metal fitting with the positioning mechanism in between.

(Function) The hot forging machine according to the present invention has a material receiver on the feed material receiving side of the stopper device, the position of which can be adjusted by a moving mechanism. By setting the position of the material receiving metal fitting according to the cutting length, it becomes possible to monitor the cutting length during cutting.

(Example) The present invention will be explained below based on FIGS. 1 and 2.

FIG. 1 is a sectional view showing an embodiment of a stopper device 6 disposed in a hot forging machine according to the present invention.

That is, the stopper device 6 includes a cylinder block 7, a material receiving metal fitting 9 that is inserted into the feed material receiving side of the cylinder block 7 and receives the fed material 8, and a material receiving metal fitting 9 which is fitted onto the material receiving metal fitting 9 and is inserted into the cylinder. A pressure sensor 12 such as a load cell is disposed inside the block 7 and detects the collision force when the material 8 is hit through a collar member 10 screwed into the material receiving fitting 9 and a spring 11. A moving mechanism 13 is attached for adjusting and setting the position of the material receiving metal fitting 9 to the required cutting length of the supplied material 8. In addition,
In the case of this embodiment, this moving mechanism 13 includes:
It has a structure in which the material receiving metal fitting 9 is moved forward and backward along the path line of the supplied material 8 by means of worm teeth carved on the outer periphery of the collar member 10 and the worm 14 that meshes with the worm teeth.

In addition, 15 in the figure is a movable blade constituting the cutting device,
16 is also a fixed blade.

Thus, the hot forging machine 5 according to the present invention has the stopper device 6 configured as described above disposed downstream of the cutting device on the material supply path line.

Next, a method for setting the position of the stopper device 6 when the hot forging machine 5 of the present invention is used to cut the feed material 8 into a predetermined length and forge it will be described.

FIG. 2 shows the feed command of the feed roll 3 and the detection value of the pressure sensor 12 of the stopper device 6 when the feed material 8 is intermittently fed to the hot forging machine 5 of the present invention using the material feed device shown in FIG. , indicates the current value of the feed roll 3, the position of the clamper 17, the position of the movable blade 15, and the rotation speed of the feed roll 3. When a feed command is issued, the current value of the feed roll 3 increases, and the feed roll 3 is rotated by the required angle. After the rotation of the feed roll 3 has stopped, in other words, after the feeding of the feed material is completed, the clamper 7 clamps the material 8, and then the movable blade 15 starts moving forward to start cutting the feed material 8.

When setting the position of the stopper device 6, for example, as shown in FIG. 2, the pressure sensor 12 has two waveforms, one before cutting and one immediately after the start of cutting. If the sensor is set so that two waveforms, waveform A at the time of completion of material feeding and waveform B after the start of cutting, are output as sensor detection values, the optimum position can be set. Note that the waveform A before cutting (material feeding completion position) is when the supplied material 8 collides with the material receiving metal fitting 9 due to intermittent feeding, and the waveform B immediately after the start of cutting is when the supplied material 8 is due to cutting. This is when the material receiving metal fitting 9 is pressed while being slightly bent.

The operating conditions in FIG. 2 were as follows: the forging pitch was 165 SPM, the outer diameter of the material was 19 mm, the material feed setting was 27.4 mm, and the stopper device was set at the tip of the material when the material feeding was completed.

Next, a method for monitoring the cutting length of the material 8 when forging the supplied material 8 using the hot forging machine 5 of the present invention will be described.

That is, when monitoring the cutting length of the feed material 8 during operation, the detected value by the pressure sensor 12 of the stopper device 6 is always taken out and input to the control device, and if the detected value exceeds the maximum allowable value, or when the value falls below the minimum allowable value, an alarm may be issued. At this time, feed roll 3
It is also possible to output the detected value to the drive motor and control it so that the subsequent detected value is within the permissible range.

(Effect of the invention) As explained above, the present invention has a configuration in which the position of the material receiving metal fitting that receives the material to be supplied to the stopper device can be adjusted by a moving mechanism, so that the pressure sensor and the drive motor of the feed roll can be adjusted. If the feed rollers are connected via a control device, even if the feed material is not supplied for the required cutting length during operation due to wear of the feed rolls, etc., the movement mechanism can be adjusted immediately and intermittent feed of the appropriate length can be performed. As a result, product quality and production efficiency can be improved. Moreover, since the pressure sensor is fixedly installed at a position farthest from the heated supply material, it is less affected by heat and vibration and has the advantage of being less likely to malfunction.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of a stopper device installed in a hot forging machine of the present invention, Fig. 2 is an explanatory diagram of position setting using the stopper device, and Fig. 3 is a cross-sectional view of an embodiment of the stopper device provided in the hot forging machine of the present invention. It is a front view of the material supply device which supplies material to a hot forging machine. 5 is a hot forging machine, 6 is a stopper device, 9 is a material receiver, 12 is a pressure sensor, and 13 is a moving mechanism.

Claims (1)

[Scope of utility model registration request] In a hot forging machine equipped with at least a straightening mechanism, a heating device, and a cutting device, a stopper device is disposed on the material pass line, and a material receiver whose position can be adjusted by a moving mechanism is provided on the feed material receiving side of the stopper device. A hot forging machine characterized in that a metal fitting is provided and a pressure sensor is fixed on the opposite side of the material receiving metal fitting with a moving mechanism in between.