JP2013255980A - End face polishing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end face polishing apparatus for polishing the end face of a rod material wherein the labor of a worker is further reduced by promoting automation of a working step including attaching/detaching work of the rod material to/from a rod material holding means.SOLUTION: In an end face polishing apparatus 1 polishing a lower end face of a columnar rod material 100 vertically mounted to a rod material holding portion 3 by pressing the lower end face onto an upper face of a motor-driven circular grinding wheel, the rod material holding portion 3 includes a receiving member 330c formed with a recessed part 3331 having a shape of conically cut from a bottom face with an inner diameter of an opening larger than an outer diameter of the rod material 100 and a chuck 33 disposed under the rod material holding portion 3 so that the central axis thereof may coincide with an extended line of a central axis of the recessed part 3331, and is composed in such a manner that the rod material 100 is inserted from a lower part of the chuck 33 and an upper end of the rod material 100 is pressed to an inner face of the recessed part 3331 to guide the upper end by a tilted inner face, a center of the upper end of the rod material 100 coincides with the central axis of the recessed part 3331 and stops, and by closing the chuck 33, the central axis of the rod material 100 is mounted in a coincided state with the central axis of the rod material holding portion 3.

Description

  The present invention relates to an end surface polishing apparatus that automatically polishes an end surface of a cylindrical bar.

  When a long rod such as a steel pipe is cut to a predetermined length with a cutting device, the end face after cutting is usually roughened with burrs, and the end face is polished in the next step. It is necessary to polish it with a smooth finish. In addition, a rod cut by a rod cutting device slightly longer than the target length is finished to an accurate length by a polishing process by precision control.

  As such an end surface polishing apparatus, for example, as described in Japanese Patent Application Laid-Open No. 6-23660, a device in which a part of the polishing process is automated is known, and in Japanese Patent Application Laid-Open No. 2002-113654, In addition, there has been proposed one that automatically replaces a polishing member such as a grindstone, and it is possible to greatly reduce the labor of the operator by these functions.

  However, even in the above-described end surface polishing apparatus in which most of the polishing process is automated, the work itself for attaching and detaching the workpiece to and from the holding means is hardly automated. This is because, when the work center axis is fixed with a slight deviation from the center axis of the holding means when the work is mounted, the finish accuracy of the end face is significantly lowered, and this part must be relied on manually. Because there is no situation.

  As for the wear of the polishing member, in addition to a method of automatically replacing this as in the above-described apparatus, a method of smoothing the surface of the grindstone with a dresser and making it usable continuously is also known. . In this case as well, it is up to the operator to determine when to use the dresser, so it currently relies on manual operation. Can be further reduced.

Japanese Patent Laid-Open No. 6-23660 JP 2002-113654 A

  The present invention is intended to solve the above-described problems, and an end surface polishing apparatus for polishing an end surface of a columnar bar material includes automation of a work process including an attaching / detaching operation of the bar material to the bar material holding means. It is an object to make further progress so that the labor of the operator can be further reduced.

  Accordingly, the present invention provides an end face for polishing while automatically pressing the lower end face of a cylindrical bar attached vertically to the bar holding means against the upper face of a circular grindstone rotating by a motor drive. In the polishing apparatus, the bar holding means includes a receiving member formed by forming a recess having a conical or hemispherical shape cut out from the bottom surface and having an inner diameter of the opening larger than the outer diameter of the bar. A chuck disposed below the bar holding means so that the center axis coincides with the center axis extension line, and a bar is inserted from below the chuck to press the upper end side against the inner surface of the recess of the member. By doing so, the upper end side of the bar is guided with the inclined inner surface and stopped in a state where the center of the upper end of the bar coincides with the central axis of the recess, and the central axis of the bar is lowered by closing the chuck. In line with the central axis Wear is completed, and shall be characterized in that.

  In this way, by pressing the upper end side of the bar to be polished against the recess cut out in a conical or semicircular shape, the circular end face center portion is guided so as to coincide with the center axis of the recess, In this state, the chuck disposed below the concave portion is closed, and the center axis of the bar coincides with the center axis of the bar holding means, so that the bar holding can be performed using a transfer means such as a robot hand without relying on human hands. The bar can be accurately mounted on the means.

  Further, in this case, the receiving member can be moved up and down along the central axis of the bar holding means, and the distance from the chuck can be changed corresponding to the fluctuation of the length of the bar. If it is characterized by this, even if the length of the work fluctuates, it can be held at an appropriate position.

  Further, in the above-described end surface polishing apparatus, below the bar material holding means, a bar material supporting means for holding the lower end side of the bar material and supporting it vertically is disposed. Inserting the upper end of the bar into the bar holding means by lowering the bar holding means, raising the bar support means or mixing both in a state where the bar is supported upright. Thus, the automatic mounting to the bar holding means can be easily realized only by a combination with a relatively simple operation by a transfer means such as a robot hand.

  Furthermore, the above-described end surface polishing apparatus is provided with a control means for executing the operation control of the apparatus, and in addition to the polishing work of the bar material, the attaching / detaching work to the bar material holding means is also performed by automatic control. If it is a characteristic, the automation of the work part which has been performed manually in the past will be realized.

  In this case, the end surface polishing apparatus is provided with dressing means for leveling and regenerating the surface of the worn circular grindstone, and the control means for detecting when the dressing operation should be started by a sensor for detecting the surface state of the circular grindstone If it is characterized in that the dressing operation is automatically performed by the control, the labor of the operator can be further reduced.

  The center of the bar is made the center axis of the bar holding means by pressing the upper end of the bar against the receiving member of the bar holding means so that its center coincides with the center axis of the recess and closing the lower chuck. According to the present invention in which they are mounted in the same manner, it is possible to greatly advance the automation of the work process including the attaching / detaching work of the bar to the bar holding means, and the labor of the operator can be further reduced.

(A) is a front view of embodiment in this invention, (B) is a right view of (A). (A) is a top view of the end surface grinding | polishing apparatus of FIG. 1, (B) is sectional drawing which follows the XX line of FIG. 1 (A). It is sectional drawing expanded along the YY line of figure (A). It is sectional drawing for demonstrating operation | movement of the end surface grinding | polishing apparatus shown in FIG. FIG. 5 is a cross-sectional view for explaining the operation of the end surface polishing apparatus shown in FIG. 3 following the state of FIG. 4. FIG. 6 is a cross-sectional view for explaining the operation of the end surface polishing apparatus shown in FIG. 3 following the state of FIG. 5. FIG. 7 is a cross-sectional view for explaining the operation of the end surface polishing apparatus shown in FIG. 3 following the state of FIG. 6. FIG. 8 is a cross-sectional view for explaining the operation of the end surface polishing apparatus shown in FIG. 3 following the state of FIG. 7. FIG. 9 is a cross-sectional view for explaining the operation of the end surface polishing apparatus shown in FIG. 3 following the state of FIG. 8. (A) And (B) is the expanded partial longitudinal cross-sectional view for demonstrating operation | movement of the dressing part in the end surface grinding | polishing apparatus of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following description and each of the drawings to be referred to, description and display of wiring, polishing water supply means, and the like, which are parts that are not related to the technical features of the invention, are simplified or omitted. In the present invention, the bar includes not only a columnar member having no cavity but also a tubular member (pipe) having a cavity.

  FIG. 1A is a front view of the end surface polishing apparatus 1 according to the present embodiment, and FIG. 1B is a side view thereof. This end surface polishing apparatus 1 vertically holds a cylindrical rod 100 such as a metal tube or a resin pipe cut by a rod cutting device (not shown) by a holding means using a chuck 33 and a receiving member 3331 (see FIG. 3). However, the lower end surface, which is the cut surface, is polished by pressing the upper surface of the circular grindstones 22, 23 rotated by the motors 25, 26 with the driving force of the ROBO Cylinder 31. Used to cut and smooth or to finish the length accurately.

  Such an end surface polishing apparatus 1 holds the bar 100 in a vertical state and the polishing portion 2 provided with circular grindstones 22 and 23 that are arranged side by side with the upper surface facing upward and are rotationally driven by motors 25 and 26. A bar holding part 3 having a function of moving the held bar 100 up and down, left and right, a grindstone dressing part 4 for performing dressing work of the circular grindstones 22 and 23, and a bar that vertically supports the bar 100. The bar support part 5 which delivers between the holding | maintenance parts 3 is provided, and operation | movement in these each part is performed by the automatic control by the electronic control apparatus 10 fundamentally.

  The bar holding portion 3 includes a slider plate 30 that slides left and right along a robot cylinder 21 that is disposed in the left-right direction on a support plate 20 that rises vertically from the rear position of the circular grindstones 22, 23; The slider plate 32 is provided with a slider plate 32 that slides up and down along the ROBO cylinder 31 that is vertically disposed on the slider plate 30. A chuck 33 is provided on the lower opening end side so that the central axes coincide with each other, and constitutes a bar holding means having these central axes as the central axes, whereby the bar 100 is oriented vertically (vertically). It is assumed that the work is automatically performed by moving it up, down, left, and right while holding it.

  FIGS. 1A and 1B show a standby state before starting the polishing operation. At this time, the bar holding unit 3 is waiting at the upper right position of the polishing unit 2. Below that, a bar support provided with a chuck 351 that holds the lower end side of the bar 100 transferred by a robot hand or the like (not shown) and supports it vertically, and a ROBO cylinder 35 that moves it up and down. Part 5 is provided.

  Further, on the left side of the holding tube 330 on the slider plate 30, the ROBO cylinder 41 arranged vertically, the slider plate 40 operating in the vertical direction thereby, and the lower side of the slider plate 40 are arranged downward. A dresser section 4 is provided which includes a dresser blade 45 made of dresser diamond or the like and automatically performs the surface regeneration work of the circular grindstones 22 and 23. Further, as shown in FIG. 1B, a nut runner 333 for locking the main body side when the chuck 33 is opened and closed is disposed in the front-rear direction from the rear side.

  Referring to FIG. 2 (A), the circular grindstones 22 and 23 are arranged in parallel in plan view so as to expose a part of the polished surface, but these are rough surfaces such as for roughing and finishing. The combination of the different grinding wheels enables efficient and highly accurate polishing work. By moving the bar 100 in the left-right direction by the left-right movement of the slider plate 30 by driving the ROBO cylinder 21, It is arranged to switch the grindstone to be used.

  2B is a partially enlarged view of the state viewed from the XX direction in FIG. 1A. The chuck 33 includes claws 335a, 335b, and 335c, and a central portion. Is a three-claw type that opens up and down, and the opening is connected to the hollow portion 300 of the upper holding tube 330 (see FIG. 1). In addition, the dresser portion 4 is disposed on the left side, but the dresser blade 45 is disposed on the left and right motion trajectory of the central axis of the bar holding portion 3 (= the central axis of the holding tube 330). .

  FIG. 3 is an enlarged cross-sectional view taken along line YY in FIG. 1 (A), and is a cross-sectional view centering on the bar holding portion 3 to explain details of the configuration. It is. As shown in the figure, at the standby position of the bar holding part 3, the central axis extension line coincides with the central axis of the bar support part 5 arranged below.

  As described above, the chuck 33 and the holding tube 330 constituting the bar holding unit 3 are arranged on the slider plate 32, and move up and down by the driving force of the ROBO cylinder 31 and accurately at an arbitrary position. Can be stopped. The holding tube 330 has a hollow portion 300 whose lower end side is open and has a receiving member 330c that can slide up and down inside, and is configured in a cylinder shape. The receiving member 330c drives the slim cylinder 330b. It slides up and down with force.

  A concave portion 3331 having an opening inner diameter larger than the outer diameter of the bar 100 is formed on the distal end side of the receiving member 330c in a conical shape cut from the bottom surface. A chuck 33 is disposed at a position where the center axis line coincides with the center axis extension line of 3331, and a bar 100 having a circular cross section is inserted from below the chuck 33, and the inner surface of the recess 3331 of the receiving member 330c is received at the upper end side. The upper end surface of the bar 100 is guided by the inclined inner surface and stopped in a state where the center thereof coincides with the center axis of the recess 3331. By closing the chuck 33, the center axis of the bar 100 is moved to the bar. The mounting is completed in a state where it matches the central axis of the material holding part 3, and this is a characteristic part of the present invention.

  The notch shape of the concave portion 3331 of the receiving member 330c is not limited to the conical shape as shown in the figure, and may be any hemispherical shape as long as the diameter is reduced toward the central axis as the depth increases. Although the upper end side of the rod 100 having a smaller outer diameter is inserted into the hollow portion 300 of the holding tube 330 through the center of the chuck 33, the outer peripheral side of the upper end surface is slid on the inclined surface of the recess 3331. While in contact, the center of the upper end surface coincides with the central axis of the recess 3331 at the stop position.

  Therefore, by holding a lower part with a three-claw chuck 33 that holds a workpiece having a circular cross section at the center position in a closed state, the center axis of the columnar bar 100 becomes the center axis of the bar holder 3. It is mounted in a state that exactly matches. Since the inner diameter of the recess 3331 substantially matches the outer diameter of the bottom surface of the cylindrical receiving member 330c and approximates the inner diameter of the hollow portion 300, the upper end side of the bar 100 is in the middle when entering the recess 3331. Almost never get caught.

  The chuck 33 according to the present embodiment is provided with an actuator 33c for rotating the upper rotation plate 33b relative to the main body 33a. The nut 33 is slightly lowered from the position shown in the drawing. By inserting the front end side of the locking body 333a of the runner 333 into the locking recess 336 on the side surface of the main body 33a and restricting the movement in the rotation direction, the rotation plate 33b is rotated in the tightening direction or the opening direction. The claws 335a, 335b, and 335c are opened and closed.

  Hereinafter, the operation from the mounting of the bar 100 to the bar holding part 3 to the start of the polishing process will be described in more detail with reference to FIGS. Each operation is basically based on automatic control of the electronic control device 10 having a control program.

  First, the bar 100 cut out by a bar cutting device (not shown) is transferred by a robot hand or the like indicated by a one-dot chain line as shown in FIG. 4, and the lower end side is placed on the chuck 351 at the standby position of the bar support 5. It is inserted and fixed vertically by its closing action. When the bar 100 is fixed, the ROBO cylinder 31 is driven and the slider plate 32 is lowered as shown in FIG. 5, so that the upper end side of the bar 100 passes through the center of the chuck 33 and the hollow portion 300 of the holding tube 330. Insert to the open position.

  Next, as shown in FIG. 6, the receiving member 330 c is lowered in the hollow portion 300 by driving the slim cylinder 330 b, and the outer periphery of the upper end surface of the bar 100 is recessed as shown in the enlarged enlarged view of the recessed portion 3331. By pressing while making sliding contact with the inclined surface of 3331, the center of the upper end surface of the bar 100 is guided in a direction that coincides with the central axis of the recess 3331, and they are in a state of being coincident at the stop position.

  When the receiving member 330c stops, the chuck 351 holding the lower end side of the bar 100 is raised by driving the cylinder 35 as shown in FIG. 7, and the bar 100 is positioned so as to be in a holding position suitable for the polishing operation. When the positioning is completed, the nut runner 333 is driven to insert the distal end of the locking body 333a into the locking recess 336 on the side surface of the main body 33a of the chuck 33 and lock it. By driving the actuator 33c, the claws 335a, 335b, 335 c is closed, whereby the bar 100 is mounted and fixed to the bar holding part 3.

  Then, as shown in FIG. 8, the chuck 351 is lowered to return to the original position, and the nut runner 333 is retracted to return to the original position. As shown in FIG. The held bar holding part 3 moves upward, and then moves to the upper side of the circular grindstones 23 and 22 by driving the ROBO cylinder 21 and polishes the lower end surface of the bar 100 while lowering by driving the ROBO cylinder 31. .

  During polishing, the pressing force of the bar 100 against the circular grindstones 22 and 23 is continuously detected by a pressure detection sensor (not shown), and the ROBO cylinder 31 or the pressing force adjustment so as to realize an appropriate pressure. The operation of the means is feedback controlled. In addition, the electronic control device 10 detects the exact length of the rod 100 before and during polishing based on the operation data of each cylinder / actuator in the mounting / polishing operation of the rod 100. Based on the above, the operation of each cylinder is accurately controlled, and the finished length of the bar 100 is precisely realized.

  Further, when the polishing operation of one end face of the bar 100 is completed, the bar 100 can be returned to the initial support position by the chuck 351 by the reverse operation to the above, but both end faces of the bar 100 are polished. In this case, the end face on the opposite side can be polished in the same procedure as described above by supporting the bar 100 in the upside down direction using the robot hand after returning to the initial support position in this way. it can.

  Referring to FIGS. 10A and 10B, the operation of the dresser unit 4 in the present embodiment will be described. An electronic control device 10 (not shown) is a high-precision contact type digital sensor disposed on the slider plate 43. A predetermined sensor 10a such as the above automatically detects the flatness and the amount of wear of the circular grindstones 22 and 23 at a predetermined timing. If the electronic control unit 10 determines that the circular grindstone 23 is in a state where the dressing operation is required based on the detected data, the circular grindstone is moved laterally by driving the ROBO cylinder 21 from the standby position in FIG. The dresser unit 4 is moved above 23.

  Then, the robot cylinder 41 is driven, the slider plate 43 is lowered, the tip of the dresser blade 45 held on the lower end side is brought into contact with the vicinity of the center of the upper surface of the circular grindstone 23, and the circular grindstone 23 is driven to rotate. By driving the cylinder 21, the dresser blade 45 is moved laterally, and all the polished surfaces except the central portion are leveled and regenerated. As shown in FIG. 3, a contact type sensor 10b for detecting the wear state of the dresser blade 45 is also provided. When the electronic control means 10 detects the replacement timing of the dresser blade 45, a predetermined sensor 10b is provided. This is notified to the operator by means.

  Thus, the end surface polishing apparatus 1 according to the present embodiment has most of its work steps automated by the control of the electronic control means 10, and the dressing work of the circular grindstones 22 and 23 is also automatically performed. Compared with the conventional example, the labor of the operator was greatly reduced.

  As described above, according to the present invention, the end face polishing apparatus for polishing the end face of the cylindrical bar material greatly reduces the labor of the operator by greatly advancing the automation of the work process including the attaching / detaching operation of the bar material to the holding means. I was able to.

  DESCRIPTION OF SYMBOLS 1 End surface grinding | polishing apparatus, 2 grinding | polishing part, 3 bar material holding | maintenance part, 4 dresser part, 5 bar material support part, 10 electronic controller, 10a, 10b sensor, 21, 31, 41, 35 ROBO cylinder, 30, 32, 43 Slider plate, 22, 23 Circular grindstone, 25, 26 Motor, 33, 351 Chuck, 100 Bar, 330c Receiving member, 3331 Recess

Claims (5)

In an end surface polishing apparatus that polishes while automatically pressing the lower end surface of a columnar bar attached vertically to the bar holding means against the upper surface of a circular grindstone rotating by a motor drive,
The bar holding means includes a receiving member formed by cutting a conical shape or a hemispherical shape from the bottom surface and forming a recess having an inner diameter of the opening larger than the outer diameter of the bar, and an extension of the central axis of the recess And a chuck disposed below the bar holding means so that the center axis line coincides with the line, and the bar is inserted from below the chuck and the upper end side is pressed against the inner surface of the recess of the receiving member. By doing so, the upper end side of the bar is guided by the inclined inner surface and stopped in a state where the center of the upper end of the bar coincides with the central axis of the recess, and the central axis of the bar is closed by closing the chuck. The end surface polishing apparatus is characterized in that the mounting is completed in a state where it coincides with the central axis of the bar holding means.   The receiving member is capable of moving up and down along the central axis of the bar holding means, and the distance from the chuck can be changed in response to a change in the length of the bar. The end surface polishing apparatus according to claim 1.   Below the bar holding means, there is disposed a bar support means that holds the lower end side of the bar in a vertical direction and supports the bar upright on the bar support means. In this state, the bar holding means is lowered, the bar support means is raised, or both are mixed, and the upper end side of the bar is inserted into the bar holding means and mounted. The end surface polishing apparatus according to claim 1 or 2, characterized in that   A control means for performing operation control of the apparatus is provided, and the attaching / detaching operation to the rod holding means in addition to the polishing operation of the rod material is also performed by automatic control. 3. An end surface polishing apparatus described in item 3.   Dressing means for leveling and regenerating the surface of the worn circular grindstone is provided, and the dressing is controlled by the control means that detects when the dressing operation should be started by a sensor for detecting the surface state of the circular grindstone. The end surface polishing apparatus according to claim 4, wherein the operation is automatically performed.

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