JPH05253736A - Press cutting of rod member - Google Patents

Abstract

PURPOSE:To improve the length dimension measurement precision of a fragment member by calculating the number of cut pieces having a prescribed cut length dimension and the length dimension of the fragment from the signal for the detection in the case where the front edge part in the axial direction of a rod member contacts the edge surface of a constant dimension stopper and the signal for the detection by an ultrasonic wave detector and setting the length dimension of the fragment member as standard. CONSTITUTION:In opposition to the rod member holding part 2 of a cutting device, keeping a prescribed intervals, constant dimension stoppers 5 for restraining the front edge surface in the axial direction of the projection part of a rod member W are arranged on a base body. The number (n) of cut pieces having a prescribed dimension L1 is calculated from the signal for the detection in the case when the front edge part A in the axial direction of the rod member W makes contact with the constant dimension stopper 5 and the signal for detecting the rear edge part B in the axial direction of the rod member W by an ultrasonic detector 6, and a cut member Wn which has a prescribed cut length dimension L1 and is cut immediately before a fragment member W0 is selected, having the length dimension L3 of the fragment member W0 which is generated at the rear edge B of the rod member and has a length less than a prescribed cut length dimension L1 as standard.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving a cutting yield when cutting a bar material such as a round bar, a square bar and a pipe with a cutting press. INDUSTRIAL APPLICABILITY The present invention can be used, for example, in a press cutting method for cutting a raw material of a closed forged product before forging from a bar material.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a press cutting method for cutting a bar has a conveying device 1 for conveying the bar W in an axial direction X and a bar W by pressing the bar W. In the cutting device having the bar material holding portions 2 and 3 for holding the cutting material W1 at the front end portion in the axial direction of the sticking member 3 and the blade portions 3 and 4 for cutting the bar material W, the cutting operation is performed by the bar material W1. When the front end A in the axial direction hits the end face C of the sizing stopper-5, a bar material detecting device (not shown) detects a signal, and the blade section 4 is automatically driven up and down by the signal to cut the bar material W. It Then, in advance, the bar material W
At the same time as the signal detected when the front end A in the axial direction hits the end face C of the sizing stopper 5, at the same time as the bar W, the rear end B in the axial direction is a bar of any of the plurality of limit switches 61. A predetermined cutting length dimension L calculated by a Ladder-chart type calculator (not shown) by a signal detected when it is separated from W
.., Wn is n pieces, and one end piece W0 having a length less than a predetermined length is cut to finish the cutting work of one bar W. That is, the cutting length dimension L1 is determined by the sizing stopper 5 located in front of the bar material W axis direction from the meshing position of the upper blade 4 and the lower blade 3 of the front end D of the bar material holding portion 3 in the bar material W axis direction. It depends on the length between the end faces C. Further, the number of cuts that can be cut from one rod W length dimension L is an integer n pieces obtained by dividing the rod W length L by a predetermined cutting length dimension L1 and one end piece having a length dimension L3. W0 occurs. Normally, the n-th cutting material Wn is classified into two types, a good product and a defective product, for the following reasons. From experience, when the diameter dimension of the bar material W is 25 mm to 50 mm, the rear end surface B of the cutting material is cut diagonally when the length dimension L3 of the end material W0 becomes less than 30 mm, depending on the material. Can be cut and cracked, and when it is used as a forging material for closed forging, defects such as lack of wall, flaws and burrs occur in the closed forged product. Also, to damage the cutting blades 3 and 4,
It becomes a defective product. On the other hand, the length dimension L3 of the scrap material W0 is 30 m
In the case of m or more, the rear end face B of the cutting material Wn is good and is a good product. However, since the cutting device is unattended due to automation due to improved production, and the accuracy of measuring the length of the end material is poor, even if the n-th cutting material Wn is a non-defective product, it is considered to be safe. They were all abandoned with W0.

[0003]

As described above, the present invention has a problem that the yield of cutting material is very poor because a good cutting material is discarded together with the end material. .. The present invention has been made to solve the above problems, and improves the accuracy of sorting good and defective cutting materials, and allows all good products to be used as raw materials for products, thereby improving the cutting material yield. It aims to provide a method for.

[0004]

According to the present invention, however, a conveying device for conveying a rod in the axial direction, and a rod holding portion for holding the rod in a state where its front end in the axial direction is projected. A cutting device having a blade part for cutting the protruding part of the bar member, and a protruding part of the bar member arranged on the base body facing the bar member holding part of the cutting device at a predetermined interval. In a bar cutting device comprising a sizing stopper for restraining the axial front end face of the rod, a signal detected when the axial front end of the rod hits the sizing stopper and the axial rear end of the rod. From the signal detected by the ultrasonic detector, calculate the number of cuts of a predetermined length dimension, and based on the length dimension of the end material less than the predetermined cutting length dimension that occurs at the rear end of the bar. Specially, the cutting material with a predetermined cutting length dimension to be cut immediately before the scrap material is selected. Press cutting method of the bar to is provided.

[0005]

According to the above construction, first, the bar material conveyed by the conveying device 1 has its front end in the axial direction passing through the bar material holding portion and the cutting device and hits the end face C of the sizing stopper. .. At that time,
From the signal to be detected and the signal to be detected by the ultrasonic wave detector, the Ladder-chart type calculator (not shown) calculates the number of cuts of a predetermined cutting length dimension and the length dimension of the end material, The cut material to be cut immediately before the end material can be sorted into a good product or a defective product based on the size.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be specifically described with reference to FIG. As shown in FIG. 1, a roller conveyor carrying device 1 is provided on the base. In front of the carrier device 1, there are provided bar holders 2 and 3, a cutting device having blades 3 and 4, and a sizing stopper-5 on a base. The sizing stopper-5 is not shown. Material detection device is installed. A material detecting device is also provided on the base above the intermediate portion of the conveying device 1, and the material detecting device is the ultrasonic range finder 6. Further, a ladder chart type calculator (not shown) having a function of calculating the signals of the material detecting device of the sizing stopper 5 and the ultrasonic distance meter 6 is provided.

Next, the operation of the above structure will be described. The rod W conveyed by the conveying device 1 detects the material when the axial direction X front end A of the rod W passes through the bar holders 2 and 3 and the cutting device and hits the end face C of the sizing stopper-5. The device detects a signal, and the blade portion 4 is automatically driven up and down by the signal to cut the bar W. Then, at the same time as the signal detected when the end face C of the sizing stopper 5 is hit, the predetermined cutting length dimension calculated by the unillustrated Ladder chart type arithmetic unit by the signal of the ultrasonic distance meter 6 , Wn of L1 and one end material W0 having a length less than a predetermined length are cut to complete the work of cutting one bar W. That is, the predetermined cutting length dimension L1 is a fixed-size stopper in the front of the rod material axial direction X from the meshing position of the upper blade 4 and the lower blade 3 of the front end D of the rod material holding portion 3 in the rod material axial direction X. It depends on the length between the end faces C of 5. Further, the number of cuts that can be cut from one rod W length dimension L is one end piece having an integer n and a length dimension L3 obtained by dividing the rod W length L by a predetermined cutting length dimension L1. W0 occurs. The n-th cutting material Wn is the length dimension L3 of the end material W0 as calculated by the ladder chart type computing unit.
Is less than 30 mm, the cut material Wn is selected as a defective product and 30 mm or more is a good product. In addition, the measurement of the length dimension L of one rod W is performed simultaneously with the signal detected by the ultrasonic rangefinder 6 at the same time as the signal detected when the front end A of the rod W in the axial direction hits the end face C of the sizing stopper-5. Calculates the length dimension L4 from the length dimension L0 of the signal detected at the rear end portion B of the bar W axis direction and the inclination angle α, and
End face C of fixed ultrasonic distance meter 6 and sizing stopper-5
It can be measured by subtracting the length dimension L4 from the length between them.

[0008]

As described above, since the present apparatus has the above-mentioned structure, the length dimension of the bar can be continuously measured. There is an excellent effect that it is possible to reliably judge whether the cut material is a good product or a defective product immediately before the end material based on the size of the material.

[0009]

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a conventional technique of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyor 2 Bar material holding part 3 Bar material holding part and blade part 4 Blade part 5 Sizing stopper-6 Ultrasonic distance meter 61 Limit switch W bar material W1-Wn cutting material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyoshi Yamazaki 1 Wano Wari, Arao-cho, Tokai City, Aichi Prefecture Aichi Steel Co., Ltd.

Claims (1)

[Claims] 1. A transport device for transporting a rod material in an axial direction, a rod material holding portion for holding a front end portion in the axial direction of the rod material in a protruding state, and a blade portion for cutting the protruding portion of the rod material. A cutting device having the same, and a sizing stopper that faces the rod holding part of the cutting device at a predetermined interval and is arranged on the base body to restrain the axial front end face of the protruding portion of the rod.
In the bar cutting device consisting of, from the signal detected when the axial front end of the bar hits the sizing stopper and the signal detected by the ultrasonic detector the axial rear end of the bar, Calculate the number of cuts of a predetermined length dimension, and based on the length dimension of the end material less than the predetermined cutting length dimension that occurs at the rear end of the bar, the predetermined cutting length that is cut immediately before the end material A press cutting method for a bar material, which comprises selecting a cutting material having a predetermined size.