JP2857951B2 - Material supply device for hot forging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying a raw material to a hot forging machine, and more particularly to a device for cutting a bar into a predetermined length to produce a raw material.

[0002]

2. Description of the Related Art Bars are cut into raw materials and supplied to forging machines. This type of material supply device transports a bar in the longitudinal direction and positions a leading end of the bar at a predetermined position, and a bar positioned by the transport / positioning device. And a cutting device for cutting the material into a material to be forged by a forging machine. When a material obtained by cutting the bar is supplied to the forging machine, it may be necessary to detect the end of the bar. For example, when the tip of the bar is irregular and not suitable as a forged material, it is necessary to start cutting the bar after cutting off the tip,
In this case, it is necessary to detect the tip of the bar. Also, when cutting a bar, it is not possible to cut the bar just enough, and it is normal that a cut-out less than a predetermined length is generated. It is necessary to detect the end of the bar for its discharge. Therefore, in the material supply device described in Japanese Patent Application Laid-Open No. 58-202714, the end of the bar is detected by a transmission type photoelectric detection device. The tip of the bar is positioned by the stopper, and from the length from the stopper to the photoelectric detection device, after the end of the bar is detected,
The length obtained by subtracting the distance traveled until the tip abuts on the stopper is divided by the length of the material obtained by cutting to obtain the number of materials obtained after detecting the end. It is designed to discharge what is done.

[0003]

However, when a plurality of bars are continuously fed, the ends and ends of successive bars may be in contact with each other. In some cases, the end of the bar could not be detected, and the end material was molded, resulting in a defective product. A similar problem occurs when a reflection type photoelectric detection device is used. Since the rod does not reflect light, a reflector that reflects the light emitted by the light emitter is provided on the opposite side of the light emitter from the rod, and the end can be detected by the presence or absence of reflected light, If there is no gap, the end cannot be detected, and the occurrence of defective products cannot be avoided. An object of the present invention is to provide a material supply device that can detect an end even when the end and the end of a bar bar that is adjacent to each other are in contact.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a heating device for heating a rod material prior to transport and positioning is provided in addition to the transporting and positioning device and the cutting device. (A) a temperature measuring device for non-contact measurement of the temperature of a bar fed by a conveying / positioning device, and (b) a bar based on a measurement result of the temperature measuring device. The gist of the present invention is to provide a detection device for detecting the end of the material.

[0005]

The temperature of the bar heated by the heating device is higher than the temperature of the space in which the bar is transported, and the measured temperature changes from high to low at the end of the bar, and the measured temperature at the tip of the bar. Changes from a low state to a high state, the end of the bar can be detected based on the change in the measured temperature. Therefore, when a plurality of rods are continuously fed, if there is a gap between the successive rods, the end and the tip are respectively detected by the temperature change. In addition, since there is a temperature difference between the preceding bar and the subsequent bar, even if their ends and tips are in contact, there is a small but distinct temperature step between them, The end of the bar can be detected from the temperature change.

[0006]

As described above, according to the present invention, the end or the tip of the bar can be detected regardless of whether or not the tip and the end of the bar are in contact with each other. It can be ejected to avoid the occurrence of defective products, or if the tip of the bar is irregular and needs to be cut, the tip is cut to an appropriate length and ejected And various other processes can be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In the material supply device, as shown in FIGS. 1 and 2, a heating device 10, a transport device 12, a cutting device 14, and a stopper 15 are provided in series.
The bar 16 is heated, transported, positioned and cut. The rod 16 has a columnar shape and is longer than the distance from the heating device 10 to the stopper 15. The heating device 10 includes two bar heater type induction heaters 20 and 2 provided in series.
2 while the bar 16 is fed in its longitudinal direction,
Heat to 0 ° C. The transport device 12 includes a pair of feed rollers 26 rotatably provided about a horizontal axis.
28, the rod material 16 is conveyed in the longitudinal direction and guided by a guide pipe 30 while the booster coil 3 for reheating is used.
It is sent until it comes into contact with the stopper 15 through 2. Transfer device 1
The transport / positioning device is constituted by 2 and the stopper 15.

The cutting device 14 has a frame 36. The frame 36 is provided with feed rollers 26 and 28 as shown in FIG.
And these feed rollers 26, 2
8, the guide pipe 30, the booster coil 32 and the like are supported from the side. An in-feed bush 38 is provided inside the frame 36 to guide the feed of the bar 16.

In the frame 36, a receiving blade 42 and a cutter 44 are provided between the infeed bush 38 and the stopper 15, and constitute the cutting device 14. The cutter 44 is provided so as to slide in the horizontal direction, and is moved toward and away from the receiving blade 42. As shown in FIG. 3, the cutter 44 is provided with a semicircular fitting groove 46 into which the bar 16 is fitted on the end face on the receiving blade 42 side, and a pressing device 47 on the upper surface. Have been. The pressing device 47 has a pressing lever 50 rotatably provided around a shaft 48. The pressing lever 50 is driven by a driving device (not shown) into a rod fitted into the fitting groove 46 as shown by a solid line. The bar 16 is rotated between a holding position for holding the bar 16 and a retreating position where the bar 16 is not held as shown by a two-dot chain line. When cutting the bar 16, after the bar 16 is brought into contact with the stopper 15 and its tip is positioned, the cutter 44 is moved in the horizontal direction while the holding lever 50 presses the bar 16. It moves to the side 42 and cuts the bar 16 into a predetermined length in cooperation with the receiving blade 42 to obtain a raw material.

A mold 52 is provided adjacent to the cutting device 14. After cutting the bar 16, the cutter 44 moves while holding the material clamped by the holding lever 50 to the mold 52. Convey material. The mold 52 includes a punch-side mold 54 in which four punches are arranged horizontally,
A die-side die 57 having four dies for forming a material in cooperation with each punch of the punch-side die 54 and a transfer device 56 for transferring the material between the dies are provided.
The materials conveyed by 4 are received and formed sequentially. The waste chute 5 is provided between the cutting device 14 and the mold 52.
8 is provided, and when the cut material is a cut piece having a length less than a predetermined length, the cut piece is clamped by the holding lever 50 during the movement of the cutter 44 to the mold 52, and the waste material is discarded. It is discarded by the reject chute 58.

The temperature of the bar 16 conveyed by the conveying device 12 is measured by a temperature sensor 60 as a temperature measuring device provided between the feed roller 28 and the guide pipe 30. The temperature sensor 60 is an optical fiber temperature sensor, and measures the temperature based on the wavelength of the heat radiation from the rod 16. The measurement terminal of the temperature sensor 60 has a diameter of 2 mm, and its tip is provided at a position 200 mm above the bar 16.

The material supply device is a control device 7 shown in FIG.
Controlled by 0. The control device 70 is a computer 7
2 mainly. An interface 74 is connected to the computer 72, and the temperature sensor 60 is connected via an amplifier 76, and a feed amount detection device 78 for detecting the feed amount of the bar 16 is connected to the computer 74. The feed amount detection device 78 is a device that detects the feed amount of the bar 16 based on the rotation amount of a drive motor that drives the feed rollers 26 and 28. A sequencer 84 is also connected to the computer 72, and the heating device 10, the transport device 1
2. The cutting device 14 and the holding device 47 are operated in accordance with a predetermined bar cutting program.

In the raw material supply device configured as described above, after the bar 16 is heated by the heating device 10,
The material is conveyed to the cutting device 14 by the conveyance device 12, cut into a predetermined length in a state where the tip is positioned by the stopper 15, and is supplied to the mold 52.

When the bar 16 is heated, transported and cut in this way, the temperature of the bar 16 is measured by the temperature sensor 60. FIG. 5 shows the temperature measurement results. After the end of the bar 16 has passed the feed rollers 26 and 28, when the subsequent bar 16 is fed by the feed rollers 26 and 28, the bar 16 is pushed by the bar 16 and fed. For this reason, there is a case where there is substantially no gap between the end and the tip of the two bar members 16, and a large temperature change does not occur as in the case where there is a gap between them. However, since the temperature of the bar 16 heated by the bar heater type induction heater 22 is about 100 ° C. higher at both ends than the intermediate portion, first, the bar which is sent earlier due to a higher measurement temperature is used. The end of the bar 16 is detected to determine where the tip of the subsequent bar 16 is, and furthermore, the bar 16 that is sent earlier comes out of the heating device 10 and is sent later. Bar material 16
Is lower than the temperature, there is a temperature difference between the end and the tip of the two rods 16, and even if the end and the tip are in contact, there is a small but clear temperature between the two. There is a step, and the minute difference is extracted by processing the detection signal,
The ends can be detected.

The measurement result of the temperature sensor 60 is
Is supplied to the computer 72, and the computer 72 detects the end of the bar 16 based on the measurement result. The boundary where the temperature changes from the low state to the high state is the end of the bar 16, and the end material to be discarded is determined based on the detection of the end of the bar 16.

The bar 1 when the end of the bar 16 is detected
As shown in FIG. 7, the remaining length of No. 6 is a distance L from the temperature sensor 60 to a cutting position (a position where the receiving blade 42 and the cutter 44 jointly cut the bar 16). Next, it is equal to the distance obtained by adding the feed amount S from the start of feeding of the bar 16 to start cutting until the end is detected. The bar 16 is intermittently fed each time the cutting is completed, and the feed amount detection device 78 measures the feed amount of the bar 16 from the start of the feed. If the bar 16 comes into contact with the stopper 15 and the feed is stopped before the end of the bar 16 is detected by the temperature sensor 60, the measured amount is cleared and a new measurement is performed at the next feed. Temperature sensor 60 at the end
Is detected, the distance L is added to the feed amount S, and the remaining length is obtained. This remaining length (L + S)
Is divided by the length L 'of the material, and the integer value obtained is the number of materials obtained after the end detection. However, the apparatus has a feeding error, a cutting error, and the like, and it is necessary to determine the end material in consideration of these.

As shown in FIG. 6, if an integer value obtained by dividing the remaining length (L + S) by the length L 'of the material is a and the remaining length is b, if there is no error, a Pieces of material can be obtained, and the (a + 1) -th material may be discarded. However, due to the error c, the end shifts forward as indicated by the dashed line, and the a-th material may not satisfy the predetermined length, or may shift rearward as indicated by the dashed line (a +
2) The first piece may not satisfy the predetermined length. As described above, the possibility that the ends are shifted is greater as the error c is larger, so that it is necessary to discard the a-th, (a + 1) -th and (a + 2) -three pieces in total. There is a lot of waste.

For example, conventionally, the end of the bar 16 has been detected between the heating device 10 and the feed roller 26, and in this case, the remaining length was 3000 mm. Therefore, the sum of the feed error and the cutting error is 1.5% of the remaining length.
If so, the sum of the errors would be 45 mm. in this case,
If the length L 'of the material is 100 mm, the ratio of the error to the length L' of the material is large. Even if the surplus length b is about 50 mm, in addition to the feeding error and the cutting error, the feed roller 26 also has an error. , 28 is likely to shift to the a-th or (a + 2) -th material due to an error caused by wear of the material, and it is necessary to discard two materials in addition to the scrap material.

On the other hand, in the material supply apparatus,
Based on the measurement result of the temperature sensor 60 provided at a position closer to the cutting device 14 than the feed rollers 26 and 28,
, The remaining length is short, about 500 mm. Therefore, the sum of the feed error and the cutting error is 7.
5 mm, the ratio to the material length is small, and even if a feed roller wear error is added, it is discarded according to the size of the remainder b when the remaining length (L + S) is divided by the material length L '. The material to be used can be reduced, and waste of the bar 16 can be reduced.

If it is assumed that the sum of all errors, such as a feed error, a cutting error and a roller wear error, does not exceed 2% of the remaining length of the material, the size is (L + S) × 0.0
It is represented by 2. And the remainder b is (L + S) × 0.02
In the following case, the remainder b is (a + 1) as shown in FIG.
The position of the end, that is, the position of the seam of the two continuous rods 16 shorter than the length of the hatched portion on the a-th material side of the a-th material, is assumed when there is no error. There is a possibility that the boundary between the (a + 1) th material and the (a + 1) th material may be crossed to the ath side.
2) There is no danger of crossing the boundary with the (a + 2) -th material and the a-th and (a + 1) -th materials should be discarded. The remainder b is (L + S) × 0.
If it is larger than 02 and smaller than L ′ − (L + S) × 0.02, the end of the bar is located at the white portion of the (a + 1) -th material in FIG. Material end is a
No shift to the (a + 2) th side
Only the (a + 1) th material needs to be discarded. Further, if the remainder b is L '-(L + S) × 0.02 or more, the end of the bar has an error, so that the boundary between the (a + 1) -th material and the (a + 2) -th material is (a + 2) There is a risk of crossing the eye side, but there is no risk of crossing the a-th side,
The (a + 1) -th and (a + 2) -th materials should be discarded. In any case, the waste of the bar 16 can be reduced as compared with the conventional case where three materials are always discarded.

After the bar 16 has passed through the feed rollers 26 and 28, the bar 16 is pushed and fed by the subsequent bar 16, so that the gap between the bars 16 is almost zero and the remaining length (L + S ) Is obtained with high accuracy, and the scraps to be discarded can be accurately obtained. However, if the end and the tip of the bar 16 that is adjacent to each other are separated, and the amount is different,
It is necessary to calculate the offcuts by including this in the error.

As described above, the end of the bar 16 is cut by the cutting device 14.
Can be detected in the vicinity of the above because the temperature of the bar 16 is measured to detect the end. Since a large amount of water or water-soluble coolant flows near the feed rollers 26 and 28 of the device for supplying the material to the hot forging machine, the environment is poor and a sensor cannot be installed below the environment. An apparatus having two members, such as a light-emitting device and a light-receiving device, installed on both sides of the bar 16 like the above-described photoelectric detection device sandwiches the bar 16 between the feed rollers 26 and 28 and the cutting device 14. Cannot be provided vertically.
Also, even if it is attempted to provide in the horizontal direction, since it cannot be installed because it is obstructed by the frame 36 of the cutting device 14, in the end it has to be provided at a position deviating from the frame 36 in the past and becomes far from the cutting device 14, Accumulation of errors has increased, resulting in waste of bars. On the other hand, the temperature sensor is a sensor provided on only one side in a direction orthogonal to the longitudinal direction of the bar 16, and can be provided on the side opposite to the frame 36 of the bar 16 or above the bar 16. Since the end can be detected by being provided at a position close to the cutting device 14, the accumulation of errors can be reduced. Since the temperature sensor 60 is hardly contaminated above the bar 16, it is particularly desirable to set the position above the bar 16.

Thus, the remaining length of the bar 16 (L + S)
From the end, the number of materials obtained after the end detection and the scraps are obtained, and when the count of the number of cuts reaches the number determined to be scraps, the clamps of the scraps by the holding lever 50 are released, and the scrap chute is disposed. Discarded at 58.

As described above, according to the material supply apparatus of the present embodiment, even if the end of the bar 16 is in contact with the tip of the succeeding bar 16, it can be detected, and the occurrence of defective products can be prevented. At the same time, detection at a position close to the cutting device 14 can reduce material waste.

As is clear from the above description, in this embodiment, the computer 72 constitutes the detecting means.

As in the above embodiment, the rod 1
If the end of the bar 6 is detected near the cutting device 14, the effect of reducing material waste can be obtained. However, the end of the bar 16 is also detected at a position before passing through the feed rollers 26 and 28. Can be. For example, a temperature sensor 86 is provided between the induction heater 22 and the feed roller 26 as shown by a one-dot chain line in FIG. 1, or a temperature sensor 88 is provided between the feed rollers 26 and 28 as shown by a two-dot chain line. Is provided. Actually, the temperature sensors 86, 8
9 and 10 show the results of measuring the temperature of the bar 16 with the sample 8 provided. In a state where the bar 16 is fed through the portion where the temperature sensor 86 is provided, of the plurality of bars 16 continuously fed, the first bar 16 is the feed roller 2.
6 and 28, and the subsequent bar 16 is fed by a feeder provided in the heating device 10 and is fed independently, so that there is a gap between the end and the tip of the bar 16 which is successive. Often occur. The bar 16 is a temperature sensor 88
The same applies to the case where the part provided with
In the graph of FIG. 10, the portion where the temperature is extremely low is the portion of the gap, and the boundary position of the temperature change is the end or the tip of the bar 16. Even when the end and the tip of the successive bar 16 are in contact with each other, a temperature step occurs as described above, and the bar 1
Of course, the end of 6 can be detected.

Further, in the above-described embodiment, the transport / positioning device is configured to position the bar 16 fed by the transport device 12 by abutting the tip of the bar 16 against the stopper 15. If the feeding is stopped every time the predetermined amount is reached, the transport device itself can also serve as the positioning device.

Further, in the above-described embodiment, the feed amount of the bar 16 is detected based on the rotation amount of the drive motor for driving the feed rollers 26 and 28, but is determined based on the feed speed and the feed time. May be detected.

In addition, without departing from the scope of the claims, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a material supply device according to an embodiment of the present invention.

FIG. 2 is a plan view schematically showing the material supply device.

FIG. 3 is a front view showing a pressing device provided on a cutter of a cutting device of the material supply device.

FIG. 4 is a block diagram illustrating a control device that controls the material supply device.

FIG. 5 is a graph showing a result of measuring the temperature of a bar by a temperature sensor provided in the material supply device.

FIG. 6 is a diagram for explaining a displacement of a distal end generated when cutting a bar.

FIG. 7 is a diagram illustrating the calculation of the remaining length of the bar when the end of the bar is detected by the temperature sensor.

FIG. 8 is a diagram for explaining calculation of scraps and materials to be discarded from a bar.

FIG. 9 is a graph showing a result of measuring a temperature of a bar by a temperature sensor provided at another position of the material supply device.

FIG. 10 is a graph showing a result of measuring a temperature of a bar by a temperature sensor provided at a further position of the material supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heating device 12 Conveying device 14 Cutting device 15 Stopper 16 Bar material 26, 28 Feed roller 60 Temperature sensor 70 Control device 86, 88 Temperature sensor

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tokutoshi Kashimura 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tetsuo Kondo 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tadahiko Ishida 12 Nakatachi-cho, Muroran-shi, Hokkaido Nittetsu Hokkaido Control System Co., Ltd. JP-A-5-138283 (JP, A) JP-A-63-36948 (JP, A) JP-A-62-24835 (JP, A) JP-A-3-14535 (JP, A) B2) Japanese Patent Publication No. 3-14536 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21K 1/00-31/00 B21J 1/00-13/14 B21J 17/00- 19/04

Claims (1)

(57) [Claims] 1. A heating device for heating a bar, a conveying / positioning device for conveying the bar heated by the heating device in a longitudinal direction thereof, and positioning a tip of the bar at a predetermined position. And a cutting device that cuts the bar material positioned by the transfer / positioning device and forms a material to be forged by the hot forging device. A temperature measuring device for measuring the temperature of the bar material in a non-contact manner, and a detecting device for detecting an end of the bar material based on the measurement result of the temperature measuring device. Material supply device.