JPH06328349A - Inline measuring method for roughness of cut surface - Google Patents

Abstract

PURPOSE:To facilitate the continuous noncontact in-line measurement of the cutting roughness of the surface of a machined material while the surface of the machined material is machined through a cutting tool. CONSTITUTION:In the case where the cutting roughness of the surface of a machined material 3 is measured while the surface of the machined material is machined by a cutting tool 2, a laser beam 32 having irradiation width wider than the diameter of a machined material 3 is radiated from one side of the machined material 3 being in the state of machining work to the machined material 3 by a laser generator 31, and the laser beam 32 is received on the side opposite to the above side of the machined material 3 by a laser beam receiver 33. Thus the cutting roughness of the surface of the machined material 3 can be in-linely measured on a difference between the maximum and minimum values of the value of received beam in a computing element 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a cutting tool (including similar tools such as a grinding tool) to perform surface cutting such as lathing and peeling on the surface of a workpiece (similar to surface grinding). In-line cutting surface roughness that is used to continuously measure the surface roughness of the work material (including similar ones such as surface grinding) while performing It relates to the measuring method.

[0002]

2. Description of the Related Art For example, a peeling machine (centerless turning machine) or a centerless grinder (centerless grinder) is used to produce a polished steel bar with a beautiful finished surface and good dimensional accuracy and quality. The surface of the material is cut or ground.

Of these, the peeling machine is also called a bar-turning machine, which rotates a cutter head to
It is a machine for unsharply scraping a bar steel material such as a standard length round bar, which has high processing accuracy, and by using a straightening machine and a grinder, a hardened layer, a decarburized layer, and a surface at the time of rolling the bar steel material. It is a machine suitable for obtaining high-quality polished steel bar with high dimensional accuracy, without any cracks or scratches on the surface of the steel, and because there is no change in internal tension or structure that tends to occur during drawing due to scraping off only the surface. It is also applicable to relatively thick materials that are generally difficult to draw and materials with high tensile strength, and is suitable for obtaining a polished steel bar having excellent dimensions and quality.

In such a peeling machine, a cutter head roll is used for centering and a roll support is used for cutting, and material support is performed by collet pushers and rolls regardless of rotation, and 3 to 4 bites are attached. There is also a method in which one set of cutter heads is rotated at high speed for cutting.

In the peeling process using such a peeling machine, the surface cutting surface roughness of the polished steel bar after the peeling process is measured, and the peeling process is performed when the surface cutting surface roughness becomes large due to tool wear or the like. Since it is necessary to stop and replace the tool, the surface roughness is measured at any time or continuously.

[0006] Conventionally, when measuring the surface cut surface roughness of such a work material, a diamond probe having a small tip radius of, for example, 10 μm or less is used, and the diamond probe has a constant unevenness on the surface of the polished steel bar. A stylus-type surface roughness meter was often used to measure the displacement of vertical movement that occurs when moving at high speed. In addition, other general surface roughness measuring methods include a method of measuring the distribution of reflected light from a rough surface, for example, a roughness using the direction of the reflected light of a light spot or a phase change. There is a method to obtain a curve, a method to directly obtain the parameter of surface roughness by using the property of reflected light distribution, and moreover, the amount of vacancy generated between the electrode plate and the metal surface There was also a method of measuring the change in electric capacity corresponding to.

[0007]

However, in the method of measuring the vertical displacement of the diamond stylus by bringing the diamond stylus into direct contact with the surface of the polished steel bar, since the diamond stylus is largely worn, it has been particularly difficult in recent years. There is a problem that it is difficult to cope with the increase in peeling speed of
Since it is not appropriate to use a stylus type surface roughness meter in such a line with a high processing speed, the situation where the surface roughness of the polished steel bar increases due to tool wear is visually inspected offline to determine the surface roughness. If the tool becomes too large, a method of stopping the machining line and exchanging the tool bite must be adopted, which causes a problem that the machining efficiency is reduced, and such a problem can be solved. It was a challenge. In addition, in the method of utilizing the distribution of the reflected light from the rough surface and the method of measuring the change in the capacitance, for example, it is suitable for measuring the surface roughness of the round bar-shaped polished steel bar. There was a problem that there was not.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and measures the surface cut surface roughness of a work material while cutting the work material surface with a cutting tool. In doing so, it is possible to continuously measure the surface cut surface roughness of the work material in-line and in a non-contact manner, and when the surface cut surface roughness of the work material exceeds a specified value, the cutting work is performed. It is possible to automatically stop the line and update the cutting tool, etc., and it is possible to significantly improve the processing efficiency of surface cutting processing on the work material, as well as needle wear in the stylus type. It is an object of the present invention to provide an in-line cutting surface roughness measuring method that does not cause a problem.

[0009]

An in-line cutting surface roughness measuring method according to the present invention uses a cutting tool (including a similar one such as a grinding tool) for lathe processing, peeling processing, and the like of the surface of a work material. During cutting (including similar things such as grinding), surface cutting (including similar things such as grinding) of the work material is in a cutting state when measuring the surface roughness. The workpiece is irradiated with a laser beam having an irradiation width wider than the diameter of the workpiece from one side of the workpiece and the laser beam is received on the opposite side of the workpiece, and the maximum received light value is obtained. It is characterized in that the surface cut surface roughness of the work material is continuously measured in-line and also in a non-contact manner based on the difference between the value and the minimum value.

[0010]

According to the in-line cutting surface roughness measuring method of the present invention, the laser beam having the irradiation width wider than the diameter of the work material is applied to the work material from one side of the work material in the cut working state. When the surface cutting surface roughness of the work material is small, the laser light is received on the side opposite to the work material while receiving the laser light which is not blocked by the work material. By the small difference between the maximum value and the minimum value of the value, it is recognized that the surface roughness of the work material is small, when the surface roughness of the work material becomes large due to abrasion of cutting, etc., It was recognized that the surface roughness of the work material increased as the difference between the maximum value and the minimum value of the received laser light increased, and in this way, the cutting of the work surface was performed. Not interrupted by the material being processed Receives the laser beam, by detecting continuously process difference between the maximum value and the minimum value of the received-light value,
The surface roughness of the workpiece can be measured continuously in-line and in a non-contact manner. By measuring the surface roughness of the workpiece in-line, the cutting efficiency of the workpiece can be improved. In addition, the non-contact measurement makes it possible to avoid problems caused by abrasion of the conventional stylus.

[0011]

EXAMPLE FIG. 1 shows an example of an in-line cutting surface roughness measuring method according to the present invention, in which a round bar material 1 as a workpiece is surface-cut by a peeling machine 2 as a cutting tool. The processing line which becomes the bar steel 3 which is a round bar-shaped processed material by processing is shown.

The peeling machine 2 shown in the figure has a divided cutter head 21 having a conical outer peripheral surface 21a, and inside the cutter head 21, a cutter head roll 22 and a cutter head bite 23 are provided. A conical inner peripheral surface 2 is provided on the outer peripheral side of the cutter head 21.
4a, the conical sleeve 24 is moved in the axial direction (that is, the left-right direction in the drawing) by the rotation of the worm 25, and as a result, the conical inner peripheral surface 24a of the conical sleeve 24 and the cutter. The cutting depth by the cutter head roll 22 and the cutter head bite 23 is changed by the paired contact with the conical outer peripheral surface 21a of the head 21.

A laser oscillator 31 is installed on one side (upper side in the figure) of the polished steel bar 3 whose surface is cut, and an irradiation width wider than the diameter of the polished steel bar 3 is provided from the laser oscillator 31. The laser light 32 which it has is emitted.

The laser light 32 which is not blocked by the polished steel bar 3 is received by the laser light receiver 33, and the light reception value at this laser light receiver 33 is calculated by the calculator 34.

The outer diameter of the polished steel bar 3 is measured by the calculator 34 based on the value received by the laser receiver 33, and the outer diameter measurement result is output as the outer diameter output in step 35 to determine the diameter of the polished steel bar 3. Is larger than the specified upper limit value, a cutting command is issued in step 36,
Motor (M) by pulse generator (PG) 37
By rotating 38 to rotate the worm 25, the conical sleeve 24 is moved to the left in the drawing, the diameters of the cutter head roll 22 and the cutter head bite 23 are reduced, and the cutting depth of the round bar material 1 for polished steel bar is reduced. Increase.

Further, when the diameter of the polished steel bar 3 becomes smaller than or is about to become smaller than the specified lower limit value, an alarm is issued in step 39.

On the other hand, the surface roughness of the polished steel bar 3 is calculated and calculated by the calculator 34 based on the difference between the maximum value and the minimum value of the light received by the laser receiver 33, and the measurement result of the surface roughness is obtained. When it is output as the roughness output in step 41 and the surface roughness of the polished steel bar 3 becomes or becomes larger than a predetermined value, an alarm is generated in step 42, the peeling process is stopped, and the cutter head is stopped. The bite 23 is replaced appropriately.

Table 1 and FIG. 2 exemplify the relationship between the surface cutting speed (line speed) and the surface roughness of the round bar material 1 for polished steel, and even when the cutting speed increases, Since the surface roughness of the cutting surface is measured by non-contact, it was possible to perform the measurement satisfactorily.

[0019]

[Table 1]

As shown in FIG. 3, the results of non-contact type surface roughness measurement using laser light according to the method of the present invention (measurement meter: two types, ○ and Δ, cutting speed: 4 m / m)
3 types, in, 6m / min and 10m / min)
Corresponds to the conventional contact-type surface roughness measurement result, and it was confirmed that the cutting surface roughness can be measured sufficiently accurately by the method of the present invention.

[0021]

According to the in-line cutting surface roughness measuring method of the present invention, when measuring the surface cutting surface roughness of the work material while cutting the work material surface with the cutting tool,
A laser beam having an irradiation width wider than the diameter of the workpiece is irradiated to the workpiece from one side of the workpiece in the cutting state and the laser beam is received on the opposite side of the workpiece. Since the surface cutting surface roughness of the workpiece is measured inline based on the difference between the maximum value and the minimum value of the received light value, when the surface of the workpiece is cut, The surface cutting surface roughness of the processed material can be continuously measured inline and without contact, and when the surface cutting surface roughness of the processed material exceeds a specified value, the cutting line is automatically It is possible to stop at this time and update the cutting tool etc., it is possible to significantly improve the processing efficiency of surface cutting processing on the work material, and at the same time, there is a problem such as needle wear in the conventional stylus type. In-line cutting skin that did not occur Leads to significantly better effect that it is possible to provide a measuring method is.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a basic configuration according to an embodiment of the present invention.

FIG. 2 is a graph showing the results of measuring the surface roughness of the workpiece in one example of the present invention.

FIG. 3 is a graph showing the results of examining the correspondence with contact type roughness measurement in one example of the present invention.

[Explanation of symbols]

 1 Work Material (Round Bar Material) 2 Cutting Tool (Peeling Machine) 3 Work Material (Polished Steel Bar) 31 Laser Oscillator 32 Laser Light 33 Laser Receiver 34 Arithmetic Unit

Claims (1)

[Claims] 1. When measuring the surface-cutting surface roughness of a workpiece while cutting the surface of the workpiece with a cutting tool, the workpiece is cut from one side of the workpiece in the cutting state. On the other hand, while irradiating a laser beam having an irradiation width wider than the diameter of the work material and receiving the laser light on the side opposite to the work material, based on the difference between the maximum value and the minimum value of the received light value. An inline cutting surface roughness measuring method characterized by measuring the surface cutting surface roughness of a work material inline.