JPH0431803B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is an automatic method for removing surface flaws from a wire or rod, which can be stably removed without horizontal wobbling of the workpiece. This invention relates to a cutting device.

(Prior art) When manufacturing special steel bars and wire rod products such as spring steel, bearing steel, and stainless steel, the surface flaws of the material are thoroughly removed before hot rolling, and then the material is subjected to hot rolling treatment. It is made into a coil. However, it is unavoidable to completely remove the flaws in the material, so the surface of the coil after hot-rolling has the maximum depth.
There may be some scattered scratches of about 0.2mm, and it is necessary to remove these surface scratches.

Traditionally, as a means of removing such scratches, manual grinder maintenance was proposed in Japanese Patent Publication No. 59-50453.
There are methods and devices proposed in various publications such as JP-A-56-114618, JP-A-58-24201, and JP-A-59-142054.

(Problem to be solved by the present invention) Manual maintenance involves loosening the cold coil,
Since flaws are detected by visually inspecting the entire four circumferences of the rod or wire, workability is extremely poor and efficiency is not desirable, and labor costs increase significantly.

Therefore, as a means of labor saving and automation, the above-mentioned special public service
Looking at Publication No. 50453, the following drawbacks can be seen.

In other words, (1) The cutting force is received by the receiving roller (theoretically at one point), and it is necessary to align the tip of the cutting tool with the center of rotation of the receiving roller in the running direction, but there may be rattling, wear, etc. of the parts. This adjustment is extremely difficult and causes variations in cutting depth, especially when cutting thin materials.

(2) Since the receiving roller for the workpiece is supported at one point (one point for the same circumference), the workpiece may oscillate laterally with respect to the cutting direction when cutting surface flaws, resulting in surface flaws being left behind or the cutting surface This may cause problems with the shape.

In addition, other known means have the disadvantage that the cutting area inevitably increases, which greatly reduces the yield.

The present invention has been made to solve the above problems.

(Means for Solving the Problems) The present invention uses a rod or wire rod such as a steel bar or a wire rod as a workpiece, and the workpiece is placed on a traveling path in which the workpiece is run in the longitudinal direction. A flaw detector is provided to detect the position of flaws in the direction and longitudinal direction, and a traveling speed detector of the workpiece is provided, and the cutting tool is operated based on flaw information from the flaw detector and speed information from the traveling speed detector. It is intended to efficiently remove only the flawed part of the workpiece, and has a minimum inner diameter approximately equal to the diameter of the workpiece, and the part that the cutting tool interferes with when heading toward the workpiece. A die guide with a notch is provided at intervals in the longitudinal direction of the workpiece, and a cutting tool having a concave cutting edge at a position corresponding to the die guide is mounted independently when facing the workpiece. The cutting tool is arranged so as to be able to move forward and backward, and three or more sets of cutting tools are arranged around the workpiece and are shifted in the axial direction of the workpiece to enable cutting of the entire circumference. be.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is an explanatory diagram showing the overall configuration of the present invention, and FIG.
The figure is a front view showing details of the main parts, Figure 3 is a partial side view of Figure 2, Figure 4 is a sectional view taken along line A-A in Figure 2,
5A is an enlarged view of part a in FIG. 2, and B in FIG. 5 is a sectional view taken along line BB in FIG.

FIG. 1 schematically shows the overall configuration of the present invention,
Reference numeral 1 denotes a supply stand, and a wire 2, which is a workpiece mounted in a coil shape on this stand, is wound with a flaw detector 3 such as a known rotating probe type vortex flaw detector in the process of being wound up by a winder 100. The surface flaws are detected. Further, the running speed of the wire 2 is detected by a speedometer 4, and a control device 5 can control drive devices 7, 7A, 7B, and 7C of the cutting machine 6.

That is, the position of the flaw in the circumferential direction and longitudinal direction of the workpiece strand 2 is detected by the flaw detector 3, and the flaw depth signal of the detection signal is used to detect the position of the flaw applied in advance to the cutting tool of the cutting machine 6. By controlling the cutting tool drive devices 7A to 7C in accordance with the calculated cutting speed and the advancing/retracting timing of the cutting tool, the cutting tool placed in the longitudinal direction of the traveling path of the strand 2, which is the workpiece, is used. Only the flawed parts are cut and removed.

The feature of the present invention is that three or more sets of cutting tools combined with die guides are provided to enable cutting of the entire circumference of the wire. That is, three or more sets of cutting tools that move forward and backward independently are installed in a die guide in which the part where the cutting tool interferes is cut out so that the cutting tool can go in and out toward the workpiece, and the cutting tool can be moved in and out of the workpiece. It is possible to cut.

The details of the cutting machine 6 are shown by referring also to FIG. There are three. The die guides 8A, 8B, and 8C have a minimum inner diameter approximately equal to the diameter of the workpiece strand 2, as shown in FIGS. A portion where the cutting tool 10A interferes is cut out so that the cutting tool 10A can move forward and backward toward the workpiece. The die guide 8A is connected to the die box 9 by the holding plate 23 and the bolt 24.
It is further fixed to the support arm 18 with bolts 25 and nuts 26. As for the material of the die guide 8A, it is preferable to use cemented carbide or the like similarly to the wire drawing die.

On the other hand, the cutting tools 10A, 10B, 10C are driven by a drive device 7A, which is a telescopic cylinder, facing the workpiece guided in the die guides 8A, 8B, 8C.
The cutting tools 10A, 10B, 1 can be independently moved forward and backward in the radial direction by the cutting tools 7B and 7C.
0C are provided at intervals in the feeding direction of the material 2, and are arranged at equal intervals in the circumferential direction, in this example 120
It is provided for each degree. In addition, when the number of cutting tools is 4, the cutting tools are provided at 90 degree intervals, and when the number of cutting tools is 6, they are provided at 60 degree intervals, corresponding to cutting tools 10A, 10B, and 10C, respectively. Dice guides 8A, 8B, and 8C are provided.

The cutting tool has concave cutting edges 11A, 11B, and 11C that follow the outer peripheral shape of the workpiece 2, as shown in FIGS. 8A and 8B with only the main parts enlarged. In this embodiment, it is a so-called flat cutting tool with an arcuate concave shape, and each of the cutting edges 11A, 11B, and 11C has a ninth
As shown in Fig. 10, the workpiece 2 is cut during cutting.
Portions 11A', 11B', and 11C' are formed which overlap each other in the circumferential direction when viewed from the axial direction of the workpiece 2, so that they can surround the entire circumference of the workpiece 2.

As shown in FIGS. 3 and 4 by a cutting tool 10A, it is press-fitted into a cutting tool holder 12 so as to be freely insertable and removable, and fastened with a bolt 13.

Note that in this embodiment, byte (hereinafter, byte 1
The tool (represented by 0A) is adjusted to a constant height of X mm with the adjusting screw 14, and its tool holder 12 is fitted into the slide unit 15 and fixed with bolts 16, and the slide unit 15 is attached to the base 17 in the radial direction. Slider 1 of support arm 18 extended as
8A, and can be adjusted and fixed in left and right directions by adjusting screws 16A.

Bit drive devices 7A, 7 are installed at the extending end of the support arm 18.
In this example, telescopic hydraulic cylinders B and 7C are provided, and a threaded connecting rod 20 is screwed onto the piston rod 19 of the cylinder, and the end surface of the rod is spaced apart so as to correspond to the head of the adjusting screw 14.

Nuts 21 and 22 are screwed onto the threaded connecting rod 20, and the upper nut 21 is used to adjust the protruding length of the connecting rod 20, and in combination with the above-mentioned cutting tool height adjustment screw 14, the cutting tool 10A can be cut. depth,
In other words, the cutting depth of surface flaws on the workpiece 2 is adjusted.

Further, the lower nut 22 is used to adjust the return distance of the connecting rod 20, that is, the distance H between the cutting tool 10A and the workpiece 2. and slider 18
The cutting tool 10A is operated by lowering the slide unit 15 through the guide A, and the time required to cut into the workpiece 2 to a certain depth is adjusted. In other words, the cutting angle of the cutting tool 10A is adjusted to Adjustments are made to the optimum conditions depending on the shape and type of cutting tool, material of the workpiece, and traveling speed.

Incidentally, the reaction force of the workpiece that is generated during cutting with the cutting tool is received by the inner surface of the die guide, and if the inner surface wears out due to the reaction force is large, it is desirable to feed lubricant into the inner surface. That is, the sixth
As shown in Figure A is a side sectional view and Figure B is a cross-sectional view taken along line C-C in A, a lubricant feed hole P is provided in the cross section of the die guide, and water-soluble cutting is carried out from the lubricant port θ. By pumping oil or the like and lubricating the workpiece 2 and the die guide 8A through the lubrication groove Q, it is possible to extend the life of the die guide 8A.

In addition, if the cutting tool is used to completely prevent horizontal wobbling of the workpiece during cutting, the hole inner diameters W and W' of the die guide 8A before and after the position where the cutting tool 10A enters and exits as shown in FIG. It is preferable to make the wire smaller than the diameters d and d' of the workpiece and draw the wire at an appropriate area reduction rate. That is, the cutting tool 10A is pulled out and held between the front and rear die guide holes 8A' and 8A'', and automatic flaw removal can be performed stably without any horizontal wobbling of the workpiece. It is also possible to level the surface of the part at the same time.

(Function) Next, to explain automatic cutting and removal of surface flaws on the workpiece 2 by the cutting machine 6, surface flaws are first removed on the line where the workpiece 2 is wound up from the supply stand 1 to the winding machine 100. Since the flaw detector 3 does not operate when the part without any defects is being wound, the three cutting tools 10A, 10B,
10C is in a stopped state at a fixed position, and the workpiece 2 is wound up to the winding machine 100 side through a traveling path by the die guides 8A, 8B, and 8C.

There is a surface flaw on the workpiece 2, which is detected by the flaw detector 3.
When a command to cut the flawed part is issued, the cutting tools 10A, 10B, 10C corresponding to the flawed part are activated by drive devices 7A, 7B, 7C using hydraulic cylinders. By elongation, a predetermined cutting amount is removed.

When the surface flaws have been cut off and passed, the drive device 7 receives a command to finish cutting.
A, 7B, 7C reduce and cut cutting tool 10
A, 10B, and 10C are returned to their old positions, and the machine waits again for the next cutting command due to the discovery of a flaw.

With reference to FIGS. 9 to 11, the control device 5
To specifically explain the control procedure using flaw detector 3,
The electric signal from the probe that detects the depth of the flaw in the wire 2 and the electric signal from the probe that detects in which part of the wire the flaw is located in the circumferential direction of the wire are extracted. .

The aforementioned cutting machine 6 has a cutting tool 3 that can move forward and backward.
each byte 10A, 10
In this example, B and 10C are provided at 120 degree intervals and at intervals in the longitudinal direction, and when a flaw signal (depth) is generated from the flaw detection probe, the position, that is, the flaw detector 3 and the bite setting The distance is synchronized with the speedometer 4, and the angular position is judged from the pulse position and the respective bites 10A, 10B, 10
C is activated.

To explain the angle of operation of the probe in detail, as shown in FIGS. 9 and 10, the position of the proximity switch S1 on the fixed side is set as the base point 0 of 0 degrees, and when the flaw detection probe 3A rotates, the probe moves. For example, 36 times per revolution to understand the angle position.
When the signal is converted into a pulse signal, the relay R1 of the bite 10A is activated when the pulse is 1 to 12, and the relay R2 of the bite 10B is activated when the pulse is 13 to 24.
At the time of 36 pulses, relay R3 of bite 10C is activated.

That is, as shown in Figure 11, three signals, a flaw depth signal and a flaw position (distance and angle) signal, are synchronized to send operation commands for each bite, and the operation of each bite is controlled by three signals. It can only operate when the signals are received simultaneously.

Further, when surface flaws are adjacent to each other or are present in the middle of the cutting range of the cutting tools, two or more adjacent cutting tools can be operated to cut and remove the surface flaws.

For example, if there is a flaw in the part P shown in FIG.
Bits 10A and 10B operate, and P2
In this case, the cutting tools 10C and 10B operate and cut, and since the operating range (depth of cut, cutting angle) of each cutting tool 10A, 10B, 10C is always constant, two or more adjacent cutting tools Even if the machine is activated, it will not cut more than a predetermined depth.

(Effects of the Invention) As described in detail above, the present invention provides three or more cutting tools 10A, 10B, 10 that move forward and backward independently.
Since C cuts the workpiece 2 while guiding it through the die guides 8A, 8B, and 8C, there is no need for difficult alignment of the cutting tool and the center of rotation of the receiving roller, which is conventionally required when receiving a cutting reaction force using the receiving roller. There are no surface flaws left behind or defects in the shape of the cut surface due to lateral vibration of the workpiece, and the cutting depth of thin materials is also stable.

As described above, according to the present invention, there is no runout of the workpiece even during surface flaw cutting, and the threading is stable, and it is expected that quality stability and improvement in automatic surface flaw cutting can be expected.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the overall configuration of the present invention, and FIG.
The figure is a front view of the cutting machine, Figure 3 is a half-cut side view showing details of the same part, Figure 4 is a sectional view taken along line A-A in Figure 2, and Figure 5A is an enlarged view of part a in Figure 2. , FIG. 5B is a sectional view taken along line B-B of the front view of FIG. Same as above C-C sectional view, No. 7
The figure is an explanatory diagram of the drawing clamp die guide, Figures 8A and B are explanatory diagrams showing the correspondence between the cutting tool and the workpiece before and during cutting, and Figures 9 to 11 are diagrams of the control device. 9, showing the control means;
The figure is a correlation diagram of wire, cutting tool, and rotating probe, 1st
FIG. 0 is an explanatory diagram of the bite and pulse signals, and FIG. 11 is a relay diagram thereof. 2 is the workpiece (wire), 3 is the flaw detector, 4 is the speed meter,
5 is a control device, 6 is a cutting machine, 7, 7A, 7
B, 7C are drive devices, 8A, 8B, 8C are dice guides, 9 is dice box, 10A, 10B, 10C
is the cutting tool, θ is the lubrication port, P is the lubricant inlet, and Q is the lubrication groove.

Claims (1)

[Claims] 1. A flaw detector that detects the position of surface flaws in the longitudinal and circumferential directions of a wire or rod-shaped workpiece (wire), and a speed detector that detects the running speed of the workpiece. In an automatic rod and wire rod surface flaw cutting device that cuts and removes flaws on the workpiece using a cutting tool that operates upon receiving information from these flaw detectors and speed detectors, the bar and wire rod surface flaw cutting equipment has a minimum inner diameter approximately equal to the diameter of the workpiece. ,
and die guides are provided at intervals in the longitudinal direction of the travel path of the workpiece, and die guides are cut out at portions where the cutting tool interferes when the cutting tool heads toward the workpiece,
A cutting tool having a cutting edge with a recessed tip at a position corresponding to the die guide is provided so as to be able to move forward and backward independently toward the workpiece, and the cutting tool is placed around the workpiece, Three or more sets are arranged offset in the axial direction of the workpiece, and each cutting edge of the cutting tool forms a portion that overlaps with the circumferential direction when viewed from the axial direction of the workpiece during cutting. 1. An automatic surface flaw cutting device in the form of a wire rod, which is capable of encircling the entire circumference of a workpiece. 2. The automatic surface flaw cutting device for rods and wires according to claim 1, characterized in that a lubricant inlet hole is provided in the cross section of the die guide. 3. The automatic surface flaw cutting device for rods and wire rods according to claim 1, wherein the inner diameter of the hole in the die guide is smaller than the diameter of the workpiece.