JP4910140B2 - Straightness measurement system for bars - Google Patents

Description

  The present invention relates to a straightness measuring system for a bar for automatically measuring the straightness of a bar such as precision fine-material polished steel bar cut to a predetermined length.

  2. Description of the Related Art Conventionally, an apparatus for straightening a wire rod has been provided in order to manufacture a rod such as a precision fine material polished steel bar used for various applications such as precision instruments (see, for example, Patent Document 1). That is, the wire rod is provided in a coil form from the production site, and has a curl, so it was necessary to straighten it before using it for the precision instrument and other various applications. . Further, the wire is cut into a predetermined length for easy processing and handling (see, for example, Patent Document 2), and further, the peripheral surface is polished so that it can be precisely used as a rod such as precision fine-material polished steel bar. It is provided to equipment manufacturers.

  By the way, the bar material such as the precision fine material polished bar steel is cut to a predetermined length, and the straightness of the cut bar material greatly affects the quality of the final product such as the precision instrument.

  For this reason, it is necessary to judge the straightness of the bar and to remove the poor quality from the production process. So far, thick materials (bars exceeding 3 mm in diameter) have been supported by the V block. The straightness is measured by a mechanical contact type measuring means.

  On the other hand, thin objects (bars with a diameter of 3 mm or less) are soft and flexible as a whole, do not have rigidity, and even if supported by a V block or the like, the center part bends (deforms), and is straight by the mechanical contact method. Measurement is impossible.

For this reason, in such a thin object, an operator picks up each bar with a finger, and determines whether the straightness is good or bad only by the sense of the fingertip.
JP 2005-177857 A Japanese Patent No. 2869626

  However, the straightness measurement method based on the sense of fingertip of the operator as described above requires many years of experience and skill, and the determination result varies depending on individual differences. In addition, there is a disadvantage that the determination result is not digitized and sufficient reliability and objectivity cannot be obtained. In addition, there is a disadvantage that the bending of the bar cannot be accurately determined only by visual observation.

  The present invention has been made by paying attention to the conventional problems as described above, while making it possible to mechanically and automatically perform straightness determination (measurement) of a bar while omitting human work, It is an object of the present invention to obtain a straightness measurement system for a bar material that does not require skill in work and can realize objective pass / fail judgment of straightness by quantification.

  In order to achieve the above object, a straightness measuring system for a bar according to the present invention is a straightness measuring system for a bar that measures the straightness of a bar cut into a predetermined length, and includes a straight knife edge. A reference long member that is installed substantially horizontally, and a plurality of bar supports for supporting both ends of the bar material that are installed facing each other at a predetermined distance from the knife edge of the reference long member. And a base that is provided to be movable in the longitudinal direction of the reference long member and the bar, and above and below the bar supported by the reference long member and the bar support member. Based on image information of the bar and the reference long member obtained by the light receiving means and the light receiving means installed on the light receiving means by irradiating light from the light emitting means to the bar and the reference long member The bar The distance between the micro-knife edge of the rod member in the longitudinal direction, is calculated for each predetermined measuring point, characterized in that it comprises a straightness calculating means for outputting as straightness information of the bar.

  With the above configuration, one bar is supported between the bar support members, and light is emitted from the light emitting means disposed above the supported bar and the reference long member. Or by further moving the reference long member, the bar support member and the bar supported by the bar support member in the longitudinal direction thereof, and the image of the bar and the reference long member. Light can be received by the light receiving means disposed below. In the light receiving means, the image light is converted into an electric signal and input to the straightness calculating means, and the straightness calculating means is based on information including the distance between the bar and the reference long member which is the electric signal. The straightness of the bar can be analyzed and calculated, and output and displayed on a display or the like as objective information such as numerical data or a graph.

  Further, the straightness measuring system of the bar according to the present invention is such that, among the bar support members, the bar support member that supports at least one end of the bar can be adjusted in the longitudinal direction of the bar. It is characterized by being.

  According to the above configuration, any one of the bar support members can be moved in accordance with the length of the bar that is a straightness measurement target, so that the bar is straight without causing a large deflection or the like. Degree measurements can be made.

  Moreover, the straightness measuring system of the bar according to the present invention is characterized in that the light emitting means is a laser generator. With this configuration, it becomes possible to measure the straightness at a large number of measurement points of the bar with high accuracy by utilizing the straightness of the laser beam generated by the laser generator.

  According to the straightness measuring system of the bar according to the present invention, the straightness measurement of the bar can be performed mechanically and automatically while omitting human work, and the skill level in operation is not required. The objective pass / fail judgment of straightness by quantification of the material can be realized with high accuracy.

  Below, the straightness measurement system of the bar material by the embodiment of the present invention is explained, referring to drawings.

  FIG. 1 is an overview diagram of a straightness measurement system for a bar according to the present invention, FIG. 2 is an operation explanatory diagram of the straightness measurement system for a bar shown in FIG. 1, and FIG. 3 is a straightness measurement procedure according to the present invention. FIG. 4 is a characteristic diagram showing straightness measurement data of a passed bar, and FIG. 5 is a characteristic diagram showing straightness measurement data of a failed bar.

  The straightness measuring system of the bar according to the embodiment of the present invention is provided with a reference long member 2 and bar support members 3, 4, and the reference long member 2 and the bar support members 3, 4 The base 1 is movably installed along the longitudinal direction of the supported bar 9, and is installed above the bar 9 supported by the reference long member 2 and the bar support members 3, 4. The light emitting means 5, the light receiving means 6 installed below, the straightness calculating means 7, and the printer 8 are provided.

  In this embodiment, first, one bar 9 to be measured is horizontally supported between the bar support members 3 and 4. Next, the base 1 provided with the reference long member 2, the bar support members 3, 4 and the bar 9 supported between the bar support members 3, 4 is moved in the longitudinal direction thereof. .

  As a result, the light emitting means 5 and the light receiving means 6 arranged so as to sandwich the reference long member 2 and the bar 9 from above and below can reduce the distance between the bar 9 and the reference long member 2. A number of measurement points of the bar 9 are converted into data, the straightness calculation means 7 calculates the straightness of the bar 9 from this data, and the result is digitized to enable output.

  Below, the straightness measuring system of the bar material of the present invention will be described in more detail. The gantry 1 is installed on the support pedestal S so as to be movable (reciprocating) by a motor and a screw rod (not shown) in the longitudinal direction thereof, and the reference long member 2 and the bar support members 3 and 4 are provided. It has been. The reference long member 2 is made of a metal material having a substantially triangular cross section having a linear knife edge 2a as a whole, and the surface is a mirror-finished surface having a high light reflectance. For this reason, the reference long member 2 may be made of a glossy metal material such as stainless steel.

  The bar support members 3 and 4 have V-shaped grooves 3a and 4a whose upper surfaces of the central part are cut into a V shape, and these support both ends of the bar 9 respectively. It is preferable to set the centers of the V-shaped grooves 3a and 4a, that is, the distance between the bar 9 and the knife edge portion 2a. However, in practice, the distance is set to 0, for example. Since it is physically difficult to adjust to maintain 1 μm, a means for correcting data by measurement software is employed. Therefore, no time is required to set the bar 9.

  Further, one of the bar support members 3 and 4 is mounted on a support block 10 that moves in the longitudinal direction of the bar 9 on the gantry 1. The support block 10 is supported so as to be slidable in the axial direction (position is freely adjustable) with respect to the guide rod 11 disposed at an equal distance from the reference long member 2.

  The support block 10 is screwed with a stopper 12 for locking the axial position with respect to the guide bar 11. On the other hand, the bar support member 4 is fixed to the gantry 1, but the guide bar 11 may be slidable in the axial direction (position adjustment is possible) similarly to the bar support member 3 if necessary.

  As the light emitting means 5, an optical device including a light emitting diode, a laser diode, or the like is used. However, high precision data is required particularly in applications where a thin object is to be measured, and thus laser light having good linearity is generated. It is desirable to have a laser diode.

  The light-emitting means 5 together with the light-receiving means 6 constitutes a high-precision inspection device called a laser scan micrometer (LSM) and is provided on a support pillar 13. The light-receiving means 6 is generated by the light-emitting means 5. It functions to receive image light obtained by irradiating light to the knife edge 2a of the bar 9 and the reference long member 2, and convert it into an electrical signal. Specifically, the image light has distance information with respect to the reference long member 2 over the entire length of the bar 9.

  Therefore, as shown in FIG. 2, the light emitting means 5 and the light receiving means 6 are installed above and below the bar 9 supported by the reference long member 2 and the bar support members 2 and 3, respectively. The

  For the straightness calculation means 7, for example, a personal computer (specifically, a microprocessor) is used. The straightness calculation means 7 includes a display 7a as an output device.

  The straightness calculation means 7 analyzes and calculates the distance (gap) of the bar 9 with respect to the knife edge 2a based on the electrical signal of the image light, and the straightness data of the bar 9 is obtained as a calculation result. Functions to output. The output data can be output and displayed on the display 7a, and can be printed out by the printer 8.

  Next, the operation will be described with reference to the flowchart of FIG.

  First, the support block 10 is moved along the guide bar 11 by operating the stopper 12 according to the bar 9 having a predetermined length, for example, 200 mm to 400 mm. When the bar support members 3 and 4 are in a positional relationship capable of supporting both ends of the bar 9, the stopper 12 is tightened so that the support block 10 is placed on the guide bar 11. Fix in place.

  Subsequently, one bar 9 is supplied and supported in the V-shaped grooves 3a and 4a of the bar support members 3 and 4 (step S1). As a result, the bar 9 is positioned at the center of the V-shaped grooves 3a and 4a, and the whole is stably supported.

  The base 1 is moved by the stable support of the bar 9, and the bar 9 supported by the reference long member 2 and the bar support members 3, 4 is preset with the movement of the base 1. Is moved horizontally at the selected speed (step S2).

  When the reference long member 2 and the bar support members 3 and 4 are moved horizontally by the gantry 1, the light emitting means 5 irradiates both the bar 9 and the reference long member 2 (step S3). For this reason, the distance information between the bar 9 and the reference long member 2 is input to the light receiving element as light image data.

  Therefore, the light receiving element 6 converts the image light into an electric signal and inputs it to the straightness calculating means 7 (step S4). The straightness calculation means 7 executes straightness calculation for the reference long member 2 based on the electrical signal (step S5), and numerically processes it or graphs the display. 7a is output and displayed (step S6). If necessary, the straightness information can be printed out by the printer 8 (step S7).

  In the above case, it is conceivable that the bar 9 is deflected (deformed) in any direction in the circumferential direction. From the image image of light from one direction of the bar 9, the bar 9 The straightness cannot be measured accurately. For this reason, the bar 9 supported by the V-shaped grooves 3a and 3b is gripped using a gripping member such as a chuck (not shown), and the bar 9 is rotated by 120 °, that is, the bar 9 Are fixed at positions rotated about 120 °, 240 °, and 360 ° around the axis, and straightness calculation is performed for each of these angular positions in the same procedure as described above. By doing so, the reliability of the straightness measurement result is extremely high. It is also possible to measure the straightness by the same method as described above, with the angle of the gripping member being 90 degrees, 60 degrees, or any other suitable angle.

  The straightness characteristic of the axial position obtained by fixing the bar 9 at the three angles is as shown in the straightness characteristic graph shown in FIG. This is a plurality of measurements in the longitudinal direction (axial direction) of the bar 9, in this case, for example, 41 points with a sense of 5 mm (when the bar length is 200 mm) to 10 mm (when the bar length is 400 mm). Points are set and the straightness obtained for each measurement point is represented by a graph. Further, since the graph can be displayed on the display 7a or printed out by the printer 8, an operator with low skill can accurately determine the straightness of the bar 9 visually. I can grasp it.

  In the case of FIG. 4, each straightness at the three angles is suppressed to within a predetermined value of 10.2 μm at any measurement point, and therefore, for example, a pass can be determined. In addition, when straightness is bad and there exists determination of disqualification, the readjustment of the bending of the said bar | burr material 9 etc. can be performed as needed.

  On the other hand, when the straightness characteristic as shown in FIG. 5 is obtained, the straightness measured at three angles exceeds the specified value of 15 μm at several measurement points, and therefore, for example, determination of failure is made. Can do.

  As described above, in the straightness measurement system for a bar according to the present embodiment, the reference long member 2 having the straight knife edge 2a and installed substantially horizontally, and the knife edge of the reference long member 2 are provided. 2a, a plurality of bar support members 3 and 4 are provided to be opposed to each other at a predetermined distance to support both ends of the bar 9, and the reference long member 2 and the bar 9 are A gantry 1 movably installed in the longitudinal direction, a light emitting means 5 and a light receiving means installed above and below the bar 9 supported by the reference long member 2 and the bar support members 3, 4. 6 and the image information of the bar 9 and the reference long member 2 obtained by the light receiving means 6 by irradiating light from the light emitting means 5 to the bar 9 and the reference long member 2, The bar 9 and the knife edge 2a Is calculated at each predetermined measurement point in the longitudinal direction of the bar 9 so that the straightness determination (measurement) of the bar 9 can be performed mechanically and automatically while omitting human work. In addition, the degree of skill in work is not required, and an objective pass / fail determination of straightness by numerical value can be realized.

  The present invention enables the straightness determination (measurement) of the bar material to be performed mechanically and automatically while omitting human work, and does not require skill in the work. This is useful for a straightness measurement system for a bar for automatically measuring the straightness of a bar such as precision fine-material polished steel bar.

It is a general-view figure of the straightness measurement system of the bar material by the embodiment of the present invention. It is operation | movement explanatory drawing of the straightness measuring system of the bar shown in FIG. It is a flowchart which shows the measurement procedure of the straightness of the bar material by embodiment of this invention. It is a straightness characteristic graph which shows the straightness measurement result by this invention. It is a straightness characteristic graph which shows the other straightness measurement result by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Reference | standard elongate member 2a Knife edge 3, 4 Bar support member 3a, 4a V-shaped groove 5 Light emission means 6 Light reception means 7 Straightness calculation means 9 Bar material 10 Support block 11 Guide rod 12 Stopper 13 Support pillar

Claims (3)

A straightness measuring system for measuring the straightness of a bar cut into a predetermined length, a reference long member having a straight knife edge and installed substantially horizontally, and the reference long member A plurality of bar support members that are installed opposite to each other at a predetermined distance from the knife edge and support both ends of the bar are provided and movable in the longitudinal direction of the reference long member and the bar A base installed on the base, a light emitting means and a light receiving means installed above and below the bar supported by the reference long member and the bar support member, and the bar and the reference from the light emitting means. Based on the image information of the bar and the reference long member obtained by the light receiving means by irradiating light to the long member, the distance between the bar and the knife edge is set in the longitudinal direction of the bar. Predetermined measurement point Straightness measuring system of the bar, characterized in that it comprises calculating a straightness calculating means for outputting as straightness information of the bar, the every. 2. The bar according to claim 1, wherein, among the bar support members, the bar support member that supports at least one end of the bar is adjustable in a longitudinal direction of the bar. Straightness measurement system. The straightness measurement system for a bar according to claim 1, wherein the light emitting means is a laser generator.

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