JPH08224635A - Device for feeding billet - Google Patents

Abstract

PURPOSE: To obtain a billet feeding device, in which the defective diameter of the billet can be judged during the feeding of the billet. CONSTITUTION: The billet 1 is fed in order by pinching the billet 1 and rotating one pair of upper and lower pinch rollers 4a, 4b. The upper pinch roller 4a can vertically be shifted and the gap between both pinch rollers 4a, 4b is displaced according to the diameter of the billet 1 pinched with both pinch rollers 4a, 4b. The displacing quantity of the upper pinch roller 4a is detected with a detecting means 6. In a controlling part 7, the billet diameter is measured based on the detecting signal from the detecting means 6, and whether the measured value of the billet diameter is in the permissible range of the preset billet diameter or not, is decided and the defective diameter of the billet 1 is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a billet feeding device for sequentially feeding billets cut from a rod-shaped rough material to a forging device or the like, and more particularly to a billet feeding device capable of judging the quality of billet diameter during billet feeding. Regarding the device.

[0002]

2. Description of the Related Art Generally, when performing forging, a rod-shaped rough material is cut into a predetermined length by a shearing device, and the cut billets are sequentially supplied to a forging device by a billet feeding device. The billet feeding is usually performed by sandwiching the billet with a pair of upper and lower pinch rollers and rotating the pinch rollers.

By the way, in the forging process, variations in the weight of the billet have a great influence on the product accuracy. For this reason, conventionally, in the shearing process of cutting the billet from the rod-shaped rough material, the billet having a defective length is discharged, and the billet feeding is temporarily stopped during the billet feeding process to take out the billet, as shown in FIG. The billet 82 is placed on the table 81, and the billet diameter is measured by using the diameter measuring device 84 while the billet 82 is applied to the fixed guide 83, and the billet having a bad diameter is discharged.

[0004]

However, the method of once stopping the billet feeding and taking out the billet in the middle of the billet feeding process and measuring the billet diameter by using the diameter measuring device is time-consuming, and the forged product is produced. There is a problem that the sex is lowered. The present invention has been made in view of the above circumstances, and an object of the present invention is to create a billet feeding device that can determine a billet diameter defect during billet feeding.

[0005]

A billet feeder according to the present invention which solves the above-mentioned problems is a billet feeder which nips between a pair of pinch rollers and sequentially feeds billets by rotating them, and at least one of the pair of pinch rollers. One is movably held with respect to the other roller so that the distance between the two pinch rollers can be displaced according to the diameter of the billet nipped by the two pinch rollers, and a detection means for detecting the displacement amount of the movable pinch roller. Is provided.

In a preferred embodiment, the reference value of the billet diameter and at least the lower limit value of the allowable range of the billet diameter are preset, the billet diameter is measured from the input signal from the detecting means, and the measured value of the billet diameter is set. However, there is provided control means for judging the wear of the pinch roller when the value of a predetermined wear judgment region belonging to the range from the reference value to the lower limit value reaches a predetermined number of times or more.

[0007]

In the billet feeder of the present invention, at least one of the pair of pinch rollers is movable with respect to the other depending on the diameter of the billet held by the pair of pinch rollers. Then, the displacement amount of the movable pinch roller is detected by the detection means. Therefore, the defective billet diameter can be determined based on the displacement amount of the pinch roller detected by the detection means, and this determination can be performed during the billet feeding process.

Here, the pinch roller is worn by use. If the wear of the pinch roller progresses, a detection error based on the wear causes the billet diameter to be judged as a defective billet diameter when the billet diameter is within the allowable range.
Alternatively, when measuring a billet whose billet diameter is out of the allowable range, the billet diameter defect is not judged.
The inconvenience of making a determination occurs.

Therefore, the reference value of the billet diameter and at least the lower limit value of the allowable range of the billet diameter are preset in the control means, and the control means measures the billet diameter from the input signal from the detection means. When the measured value of the billet diameter exceeds a predetermined number of times in a value of a predetermined wear determination region belonging to the range from the reference value to the lower limit value,
If the wear of the pinch roller is determined, the NG determination based on the wear of the pinch roller can be prevented. Moreover, the wear of the pinch roller can be determined during the billet feeding process.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments. (Embodiment 1) The billet feeder of this embodiment is a billet 1 cut into a predetermined length by a shearing device (not shown).
Are sequentially sent to the heater coil 2. The billet 1 heated by the heater coil 2 to a predetermined temperature is sent to a forging device (not shown).

This billet feeding device detects a conveyor 3 on which the billet 1 is placed and is fed together with the billet 1, a pair of upper and lower pinch rollers 4a and 4b on the front side, and a pair of upper and lower pinch rollers 5a and 5b on the rear side. It is mainly composed of means 6 and a control unit (control means) 7. The upper pinch roller 4a on the front side and the upper pinch roller 5a on the rear side are rotatably held by a base (not shown) and vertically movable. The front lower pinch roller 4b and the rear lower pinch roller 5b are rotatably held on a base (not shown). As a result, the distance between the front pinch rollers 4a and 4b is displaced according to the diameter of the billet 1 held between the pinch rollers 4a and 4b. Similarly, between the two pinch rollers 5a and 5b on the rear side,
It is displaced according to the diameter of the billet 1 held between a and 5b. The upper pinch roller 4a on the front side clamps the billet 1 between the upper pinch roller 4a and the lower pinch roller 4b and sends out the billet 1 so that the billet 1 can be sent out.
It is configured such that a constant clamping pressure for clamping the billet 1 acts on it with b. Similarly, the upper pinch roller 5a on the rear side is also configured to exert a certain holding pressure for holding the billet 1 with the lower pinch roller 5b. The lower pinch rollers 4b and 5b can be rotationally driven by a driving device (not shown).

The detecting means 6 is the upper pinch roller 4 on the front side.
The jig 61 is in contact with the upper end surface of a and is held by a base (not shown) so as to be vertically movable, and a laser type distance sensor 62 for detecting the amount of displacement of the jig 61. That is, the jig 61 can move up and down following the vertical movement of the front upper pinch roller 4a, and the amount of displacement of the jig 61 is detected by the laser type distance sensor 62.

A vertical displacement signal of the jig 61 measured by the laser distance sensor 62 is sent to the controller 7.
The control unit 7 is preset with a reference value of the billet diameter and an upper limit value and a lower limit value of the allowable range of the billet diameter. The control unit 7 is capable of measuring the billet diameter from the signal from the laser distance sensor 62 and determining whether or not the measured value of the billet diameter is within the allowable range of the billet diameter. Further, when the measured value of the billet diameter judged from the signal from the laser type distance sensor 62 exceeds the preset allowable range of the billet diameter, the control unit 7 sends a stop signal to the driving device for the lower pinch rollers 4b and 5b. Is configured to stop the billet feeding.

With the billet feeder having the above structure, it is possible to judge the diameter defect of the billet 1 while sequentially feeding the billet 1 as follows. That is, when the lower pinch rollers 4b and 5b are rotationally driven by operating a driving device (not shown), each billet 1 placed on the conveyor 3 has both the rear pinch rollers 5a and 5b and the front pinch rollers 4a. It is sent out forward while being pinched by 4b with a constant pinching pressure. At this time, the rear upper pinch roller 5a and the front upper pinch roller 4a move up and down according to the diameter of the billet 1 while rotating. Therefore, for example, when a billet having a bad diameter (a billet having a diameter smaller than the standard billet diameter) 1a is mixed as shown in FIG. 1, the rear upper pinch roller 5a and the front upper pinch roller 4a rotate. While moving, it moves downward depending on the diameter of the billet 1a. At this time, since the jig 61 of the detection means 6 moves downward following the upper pinch roller 4a on the front side, the displacement amount of this jig 61 is determined by the laser distance sensor 62.
Measures and sends a signal to the control unit 7. The control unit 7 measures the billet diameter from the signal from the laser type distance sensor 62 and determines whether the measured value of the billet diameter is within a preset allowable range of the billet diameter. When the signal from the sensor 62 exceeds a preset allowable range of the billet diameter, it is determined that the billet diameter is defective, and a stop signal is sent to the driving device of the lower pinch rollers 4b and 5b to stop the billet feeding.

The determination in the control unit 7 will be specifically described. When sending a billet 1 with a diameter of 70 mm, the standard value is 70 mm, and the upper limit of the allowable range of the billet diameter is 71 m.
m, and 69 mm as the lower limit of the allowable range of billet diameter
Is preset in the control unit 7, and it is determined whether or not the measured value of the billet diameter determined from the input signal from the laser type distance sensor 62 is within this allowable range (69 to 71 mm).

Then, the billet feeding device has a diameter of 70 m.
When the billet diameter was repeatedly fed and the billet 1 was repeatedly measured, the precision of the measurement was found to be about ± 0.3 mm. Therefore, according to the billet feeder of the present embodiment, it is possible to judge the diameter defect of the billet 1 while feeding the billet, and stop the billet feeding as in the conventional case or measure the diameter separately after taking out the billet 1. Since it is not necessary to measure the diameter using a device, the productivity of the forged product can be improved. In addition, the billet feeder of the present embodiment is the existing billet feeder with the detection means 6 and the control unit 7 added thereto, so that the facility can be simplified.

The structure of the detecting means 6 is not limited to the one described in the above embodiment, and instead of the laser distance sensor, other non-contact type sensors such as electromagnetic (proximity type) sensors and pulser integrated. It is also possible to use a contact sensor such as a rotary cylinder. In the above embodiment, only the upper pinch roller 4a of the pair of upper and lower pinch rollers 4a and 4b can be moved up and down, and the displacement amount of the upper pinch roller 4a is detected by the detecting means 6. The lower pinch roller 4b can be moved up and down instead of the pinch roller 4a, and the displacement amount of the lower pinch roller 4b can be detected by the detection means 6, or both the upper and lower pinch rollers 4a and 4b can be moved up and down. The displacement amounts of 4a and 4b may be detected by the pair of detection means 6 and 6.

In the above embodiment, a pair of upper and lower pinch rods
Lower pinch roller 4b among the la 4a, 4b, 5a, 5b,
Although the configuration in which only 5b is driven has been described, it is also possible to drive all the upper and lower pinch rollers 4a, 4b, 5a, 5b. (Embodiment 2) In this embodiment, during billet feeding, the wear of the pinch rollers 4a, 4b is determined while determining the quality of the billet diameter, and a billet feeding device having the same configuration as that of Embodiment 1 above. To use. Further, in the control unit 7, as in the first embodiment, the reference value of the billet diameter is 70 mm, and the upper limit value of the allowable range of the billet diameter is 71 mm.
mm, and 69 m as the lower limit of the allowable range of billet diameter
m is preset, and the laser distance sensor 62 is
The quality of the billet diameter is determined by whether or not the measured value of the billet diameter determined from the input signal from is within this allowable range (69 to 71 mm).

In the present embodiment, a predetermined wear determination region belonging to the range from the reference value to the lower limit value is preset in the control unit 7. In the present embodiment, the area between the lower limit value (69 mm) and the predetermined value (69.1 mm) is the wear determination area, but this wear determination area may belong to the range from the base value to the lower limit value. It is not particularly limited, and its size and position can be set arbitrarily.

Further, in the control section 7, the measured value of the billet diameter judged from the input signal from the laser type distance sensor 62 is equal to or larger than the value of the wear judgment area a predetermined number of times (in the present embodiment, 10 consecutive times). When the pinch rollers 4a, 4b are worn, it is judged that the pinch rollers 4a, 4b have worn, and a stop signal is sent to the driving device for the lower pinch rollers 4b, 5b to stop the billet feeding. In the present embodiment, when the measured value of the billet diameter is 10 times or more in succession to the value in the wear determination region, the pinch roller 4a,
Although it is determined that the 4b is worn, it is not always necessary to continue, and the number of times can be set appropriately.

Therefore, the pinch rollers 4a and 4b are gradually worn due to continuous use, and as a result, as shown in FIG. 2, the billet diameter measured value (determined from the input signal from the laser type distance sensor 62). Even when the plot value of FIG. 2) gradually approaches the lower limit value from the reference value, the pinch rollers 4a and 4b are worn when the measured value is 10 times or more in succession to the value in the wear determination region. It is determined that the billet has been fed, and the billet feeding is stopped. Therefore, it is possible to effectively prevent the NG determination based on the wear of the pinch rollers 4b and 5b.

[0022]

As described above in detail, in the billet feeder of the present invention, the detecting means detects the displacement amount of the pinch roller which is displaced according to the diameter of the clamped billet. The diameter defect of the billet can be judged at the same time as the billet is fed, and the productivity of the forged product can be improved, for example, when the billet for forging is fed. Further, since the existing billet feeding device has a simple structure in which the detecting means is added, the expandability to the existing equipment is good and the equipment can be simplified.

Further, the reference value of the billet diameter and at least the lower limit value of the allowable range of the billet diameter are set in advance in the control means, and this control means determines the measured value of the billet diameter judged from the input signal from the detection means. However, when the wear of the pinch roller is judged when the value of the predetermined wear judgment region belonging to the range from the reference value to the lower limit value reaches a predetermined number of times or more, the pinch roller is fed while the billet is being fed. The wear of the pinch roller can be determined, and the NG determination based on the wear of the pinch roller can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a side view schematically illustrating the overall configuration of a billet feeder according to this embodiment.

FIG. 2 is a diagram for explaining how the measured value of the billet diameter gradually approaches the lower limit value of the billet diameter allowable range from the reference value as the pinch roller wears.

FIG. 3 is a side view for explaining how a conventional billet diameter is measured.

[Explanation of symbols]

1 is a billet, 4a, 4b, 5a and 5b are pinch rollers, 6 is a detection means, 61 is a jig, 62 is a laser type distance sensor, and 7 is a control section (control means).

Claims (2)

[Claims] 1. A billet feeder for sequentially feeding billets by being pinched by a pair of pinch rollers and being rotated, wherein at least one of the pair of pinch rollers has a diameter corresponding to the diameter of the billet held by the pinch rollers. A billet feeder, characterized in that detection means is provided which is movably held with respect to the other pinch roller so that the pinch rollers can be displaced, and which detects the amount of displacement of the movable pinch roller. 2. A billet diameter reference value and at least a lower limit value of an allowable range of the billet diameter are preset, and the billet diameter is measured from an input signal from the detecting means,
Control means is provided for judging the wear of the pinch roller when the measured value of the billet diameter reaches a value of a predetermined wear judgment region belonging to a range from the reference value to the lower limit value a predetermined number of times or more. The billet feeding device according to claim 1, wherein: