JP2011005570A - Apparatus and method of cutting and burnishing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting and burnishing apparatus and a cutting and burnishing method capable of continuously and accurately performing cutting and burnishing work even on an outer peripheral surface of a curved workpiece.SOLUTION: The cutting and burnishing apparatus 1 includes a cutting unit 4, a burnishing unit 5 and a conveyance unit 3. The cutting unit 4 cuts the outer peripheral surface of the workpiece W while centering the workpiece W by cutting tools 31a, 31b and 31c. In the burnishing unit 5, a burnishing roller 41 applies force of feeding the workpiece W in the conveyance direction while pressing and burnishing the outer peripheral surface of the workpiece W. The conveyance unit 3 feeds the workpiece W while holding it until the workpiece W reaches the burnishing unit 5.

Description

  The present invention relates to a cutting burnishing apparatus and a cutting burnishing method that perform cutting and burnishing on a workpiece.

  Generally, burnishing is known as processing on the surface of a metal workpiece. In the burnishing process, for example, an abnormal layer such as a scratch can be removed from the surface of the workpiece by crushing the surface of the workpiece with a roller. Moreover, the strength of the workpiece can be improved by the work hardening of the surface of the workpiece.

  In general, before performing the burnishing, cutting using a tool such as a reamer is performed in order to process the workpiece to a dimension suitable for the burnishing. Here, conventionally, techniques for continuously performing cutting and burnishing have been developed. For example, in the composite tool disclosed in Patent Document 1, a cutting tool for cutting and a roller for performing burnishing are integrally provided side by side in the axial direction. Then, by inserting the composite tool into the workpiece while rotating it, cutting and burnishing of the inner peripheral surface of the workpiece can be performed continuously.

JP 2000-317828 A

  The above composite tool is for processing the inner peripheral surface of a hollow workpiece, but does not continuously perform cutting and burnishing on the outer peripheral surface of the workpiece. It is very difficult to continuously perform cutting and burnishing on the outer peripheral surface of the workpiece. The reason for this is that for a long workpiece such as a hollow pipe or a solid bar, a certain degree of bending with respect to the axis is allowed. That is, as a means for processing the outer peripheral surface of the workpiece, cutting with a lathe is generally used. In this case, the workpiece is rotated and a cutting tool is pressed against the outer peripheral surface of the workpiece. At that time, if the workpiece has a bend, it is difficult to rotate the workpiece. Further, since the bending work piece rotates, vibration is generated, and it is difficult to improve machining accuracy. Furthermore, as shown in FIG. 6, when the workpiece is a hollow tube 100, the tube 100 or the blade 101 is moved in the axial direction while rotating the tube 100 (see arrow A2) (arrow A3). (See) When cutting is performed, uneven thickness (see thicknesses t1 and t2 in FIG. 6) occurs. Furthermore, when the outer peripheral surface of the workpiece cannot be processed with high accuracy in cutting, it is difficult to perform subsequent burnishing with high accuracy.

  An object of the present invention is to provide a cutting burnishing apparatus and a cutting burnishing method capable of continuously and accurately performing cutting and burnishing even on an outer peripheral surface of a bent workpiece. .

  The cutting burnishing apparatus according to the first invention includes a cutting unit, a burnishing unit, and a transport unit. The cutting unit has at least three cutting tools and a driving device. The cutting tools are arranged side by side around a predetermined center of rotation. The driving device rotates the blade around the center of rotation. The cutting unit cuts the outer peripheral surface of the workpiece while centripetating the workpiece with the cutting tool. The burnishing unit has a plurality of rollers. The roller applies a force for feeding the workpiece in the conveying direction while performing burnishing by pressing the outer peripheral surface of the workpiece. The burnishing unit is disposed on the downstream side of the cutting unit in the conveyance direction of the workpiece. The conveyance unit is arranged on the upstream side of the cutting unit in the conveyance direction, and sends the workpiece in the conveyance direction while holding the workpiece until the workpiece reaches the burnishing unit.

  In this cutting burnishing apparatus, the workpiece is first sent to the cutting unit by the transport unit. The cutting unit rotates a plurality of cutting tools around the workpiece to cut the outer peripheral surface of the workpiece while centripeting the workpiece. At this time, the conveyance unit holds the workpiece against the reaction force caused by the cutting and sends the workpiece in the conveyance direction. When the workpiece is further conveyed by the conveying unit in the conveying direction and the tip of the workpiece reaches the burnishing unit, the workpiece is burnished by the roller. At this time, the outer peripheral surface of the workpiece is pressed by a plurality of rollers, and a force for feeding the workpiece in the transport direction is applied to the workpiece. Thereby, the force for conveying the workpiece in the conveying direction and the holding force against the reaction force due to the cutting in the cutting unit are given to the workpiece by the burnishing unit. When the workpiece is further conveyed in the conveying direction by the burnishing unit and the rear end of the workpiece passes through the burnishing unit, the cutting and burnishing on the workpiece are completed.

  As described above, in this cutting burnishing apparatus, cutting and burnishing can be continuously performed without rotating the workpiece. For this reason, the problem by rotating the bending workpiece mentioned above does not generate | occur | produce. In addition, the work piece necessary for the cutting process can be held by the transport unit positioned on the upstream side of the cutting unit and the burnishing unit positioned on the downstream side of the cutting unit. For this reason, cutting and burnishing can be performed continuously. Thereby, cutting and burnishing can be continuously performed with high accuracy even on the outer peripheral surface of the bent workpiece.

  A cutting burnishing apparatus according to a second aspect of the present invention is the cutting burnishing apparatus according to the first aspect of the present invention, wherein the conveying unit releases the hold on the workpiece after the workpiece reaches the burnishing unit.

  In this cutting burnishing apparatus, the workpiece is held by the transport unit until the workpiece reaches the burnishing unit, and after the workpiece reaches the burnishing unit, the workpiece is held by the burnishing unit. . For this reason, it is possible to shorten the period during which the workpiece is simultaneously held by both the transport unit and the burnishing unit. Thereby, it can suppress that the to-be-centered in a cutting unit becomes obstructed because a workpiece is hold | maintained by both a conveyance unit and a burnishing unit. In addition, it is possible to eliminate a mismatch in feed speed synchronization that may occur when a workpiece is transported by a plurality of transport units.

  The cutting burnishing method according to the third aspect of the present invention includes a step of cutting, a step of burnishing, and a step of conveying a workpiece. In the cutting step, the outer peripheral surface of the workpiece is cut by the cutting unit while the workpiece is centered by the cutting tool. The cutting unit has at least three cutting tools arranged side by side around a predetermined rotation center, and a drive device that rotates the cutting tool around the rotation center. In the step of performing the burnishing process, the burnishing unit performs burnishing on the outer peripheral surface of the workpiece. The burnishing unit has a plurality of rollers that apply a force for feeding the workpiece in the conveyance direction while pressing the outer peripheral surface of the workpiece and performing the burnishing process, on the downstream side of the cutting unit in the conveyance direction of the workpiece. Be placed. In the step of conveying the workpiece, the workpiece is conveyed by the conveyance unit until it reaches the burnishing unit. The conveyance unit is disposed on the upstream side of the cutting unit in the conveyance direction, and sends the workpiece in the conveyance direction while holding the workpiece.

  In this cutting burnishing method, the workpiece is first sent to the cutting unit by the transport unit. The cutting unit rotates the cutting tool around the workpiece and cuts the outer peripheral surface of the workpiece while centripetating the workpiece. At this time, the conveyance unit holds the workpiece against a reaction force caused by the cutting process in the cutting unit and sends the workpiece in the conveyance direction. When the workpiece is further conveyed by the conveying unit in the conveying direction and the tip of the workpiece reaches the burnishing unit, the workpiece is burnished by the roller. At this time, the outer peripheral surface of the workpiece is pressed by a plurality of rollers, and a force for feeding the workpiece in the transport direction is applied to the workpiece. Thereby, the force for conveying the workpiece in the conveying direction and the holding force against the reaction force due to the cutting in the cutting unit are given to the workpiece by the burnishing unit. The workpiece is further conveyed in the conveying direction by the burnishing unit, and the cutting and burnishing on the workpiece are completed in which the rear end of the workpiece passes through the burnishing unit.

  As described above, in this cutting burnishing method, cutting and burnishing can be continuously performed without rotating the workpiece. For this reason, the problem by rotating the bending workpiece mentioned above does not generate | occur | produce. In addition, the work piece necessary for the cutting process can be held by the transport unit positioned on the upstream side of the cutting unit and the burnishing unit positioned on the downstream side of the cutting unit. For this reason, cutting and burnishing can be performed continuously. Thereby, cutting and burnishing can be continuously performed with high accuracy even on the outer peripheral surface of the bent workpiece.

  A cutting burnishing method according to a fourth aspect of the present invention is the cutting burnishing method of the third aspect, wherein in the step of conveying the workpiece until it reaches the burnishing unit, the conveying unit reaches the burnishing unit. After that, the holding on the workpiece is released.

  In this cutting burnishing method, the workpiece is held by the transport unit until the workpiece reaches the burnishing unit, and after the workpiece reaches the burnishing unit, the workpiece is held by the burnishing unit. . For this reason, it is possible to shorten the period during which the workpiece is simultaneously held by both the transport unit and the burnishing unit. Thereby, it can suppress that the to-be-centered in a cutting unit becomes obstructed because a workpiece is hold | maintained by both a conveyance unit and a burnishing unit. In addition, it is possible to eliminate a mismatch in feed speed synchronization that may occur when a workpiece is transported by a plurality of transport units.

  In the cutting burnishing device and the cutting burnishing method according to the present invention, cutting and burnishing can be continuously performed with high accuracy even on the outer peripheral surface of a bent workpiece.

The side view which shows the whole cutting burnishing apparatus. The front view of a conveyance unit. The front view of a cutting unit. The side view of the burnishing roller and burnishing roller holding member of a burnishing unit. Sectional drawing in the plane perpendicular | vertical to the axial direction of a burnishing unit. Side surface sectional drawing which shows the workpiece which received the cutting which concerns on a prior art.

[Configuration of cutting burnishing equipment]
A cutting burnishing apparatus 1 according to an embodiment of the present invention is shown in FIG. The cutting burnishing apparatus 1 is an apparatus that can continuously perform cutting and burnishing on a long workpiece W. As the workpiece W, a hollow pipe made of metal such as carbon steel or a solid rod-like member can be used. The cutting burnishing apparatus 1 includes a first conveyor unit 2, a transport unit 3, a cutting unit 4, a burnishing unit 5, and a second conveyor unit 6.

  The first conveyor unit 2 is disposed on the upstream side of the transport unit 3 in the transport direction (see arrow A1 in FIG. 1), and includes a first conveyor base 11 and a plurality of first conveyor rollers 12. The 1st conveyor base part 11 is supporting the some 1st conveyor roller 12 rotatably. The plurality of first conveyor rollers 12 are arranged side by side in the transport direction. In addition, in FIG. 1, the code | symbol is attached | subjected only to the one 1st conveyor roller 12, and the code | symbol of the other 1st conveyor roller 12 is abbreviate | omitted. The workpiece W is conveyed on the first conveyor roller 12 while being in contact with the first conveyor roller 12. The first conveyor roller 12 is driven to rotate as the workpiece W moves.

  The conveyance unit 3 is disposed upstream of the cutting unit 4 in the conveyance direction, and sends the workpiece W in the conveyance direction while holding the workpiece W until the workpiece W reaches the burnishing unit 5. As shown in FIGS. 1 and 2, the transport unit 3 includes a holding roller 21, a transport motor 22, a pair of support rollers 23 and 24, a roller moving device 25, an upper frame 26, a lower frame 27, a controller 28, and the like.

  The restraining roller 21 is a cylindrical member, and is disposed along a direction in which the central axis X1 is horizontal and perpendicular to the transport direction (the direction perpendicular to the paper surface in FIG. 1 and hereinafter referred to as “width direction”). Has been. The restraining roller 21 is provided to be rotatable about the central axis X <b> 1 and is driven to rotate by the transport motor 22. The restraining roller 21 is disposed so as to come into contact with the workpiece W to be conveyed from above, and presses the workpiece W. Further, the restraining roller 21 is rotationally driven by the transport motor 22 to apply a force for moving the workpiece W in the transport direction.

  The pair of support rollers 23 and 24 are cylindrical members, and are arranged symmetrically with each other in the width direction. The center axes X2 and X3 of the support rollers 23 and 24 are arranged to be inclined with respect to the width direction. The support rollers 23 and 24 are disposed so as to come into contact with the workpiece W to be conveyed from below. The support rollers 23 and 24 are rotatably supported by the lower frame 27 and are driven to rotate as the workpiece W moves. The support rollers 23 and 24 and the restraining roller 21 are perpendicular to the conveying direction of the workpiece W so that the axis of the workpiece W coincides with the rotation center of the cutting unit 4 and the burnishing unit 5 described later. Restrict movement to Further, the support rollers 23 and 24 and the restraining roller 21 regulate the rotation of the workpiece W around the axis center by sandwiching the workpiece W.

  The roller moving device 25 is a device that moves the holding roller 21 in the vertical direction, and includes a holding roller support member 29 and a moving mechanism 30. The restraining roller support member 29 supports the restraining roller 21 rotatably. The moving mechanism 30 moves the roller support member 29 up and down by a driving force of a hydraulic cylinder or a motor (not shown). The upper frame 26 supports the roller moving device 25. The lower frame 27 supports the support rollers 23 and 24 and the upper frame 26 described above.

  The controller 28 controls the rotation of the suppression roller 21 by controlling the transport motor 22. The controller 28 can control the conveyance speed of the workpiece by controlling the rotation speed of the conveyance motor 22. Further, the controller 28 can control the position of the restraining roller 21 by controlling the roller moving device 25. The controller 28 has a position (hereinafter referred to as “feed position”) where the restraining roller 21 contacts the workpiece W, and a position above the feed position where the roller does not contact the workpiece W (hereinafter referred to as “open position”). 2) (refer to arrow A4 in FIG. 2). The controller 28 moves the suppression roller 21 to the feed position when the workpiece W passes through the transport unit 3. Accordingly, the workpiece W is held by the restraining roller 21 and the support rollers 23 and 24, and the workpiece W is transported in the transport direction by the rotation of the restraining roller 21. Further, when the workpiece W reaches the burnishing unit 5, the controller 28 moves the holding roller 21 to the open position. Thereby, the holding | maintenance with respect to the workpiece W is cancelled | released. Specifically, a sensor 13 for detecting the workpiece W is provided at the outlet of the transport unit 3. The sensor 13 is, for example, an optical sensor, detects the passage of the workpiece W, and sends a detection signal to the controller 28. The controller 28 raises the suppression roller 21 from the feed position to the open position after a predetermined time has elapsed after receiving the detection signal. This predetermined time is the time required for the workpiece W to pass through the exit of the transport unit 3 and reach the burnishing roller 41 of the burnishing unit 5 described later, and the burnishing unit 5 described later from the exit of the transport unit 3. Is calculated in advance from the distance to the burnishing roller 41 and the conveying speed of the workpiece.

  In addition, the distance in the conveyance direction between the cutting unit 4 and the burnishing unit 5 is set shorter than the length of the workpiece W. More specifically, the distance from the center axis X1 of the pressing roller 21 of the cutting unit 4 to the upstream end of the burnishing roller 41 in the conveying direction of the burnishing unit 5 is set to be shorter than the length of the workpiece W. . Typical sizes of the workpiece W include, for example, φ100 × 500 mm, φ140 × 1400 mm, φ200 × 2000 mm, and the like. In the same cutting burnishing apparatus 1, when a plurality of types of workpieces W are processed, the cutting unit 4 and the burnishing unit 5 are disposed at a distance shorter than the length of the shortest workpiece W. The distance between is set. Further, the distance between the cutting unit 4 and the burnishing unit 5 may be changed every time the length of the workpiece W changes.

  The cutting unit 4 performs cutting of the outer peripheral surface of the workpiece W. As shown in FIGS. 1 and 3, the cutting unit 4 includes a plurality of cutting tools 31 a, 31 b, 31 c, a cutting tool holding member 32, a cutting table 33, and a cutting motor 34.

  The plurality of blade tools 31a, 31b, and 31c are arranged side by side around a predetermined rotation center, and specifically, three blade tools 31a, 31b, and 31c are provided.

  The blade holding member 32 has a cylindrical shape and holds the blades 31a, 31b, 31c. The blade holding member 32 is provided with three openings 35a, 35b, and 35c that penetrate the blade holding member 32 in the radial direction. These openings 35 a, 35 b, and 35 c are arranged at equal intervals in the circumferential direction of the blade holding member 32. The blades 31a, 31b, and 31c are inserted into the openings 35a, 35b, and 35c, respectively. The blade holding member 32 has a distal end of the blades 31a, 31b, and 31c in the radial direction from the inner peripheral surface of the blade holding member 32. The blades 31a, 31b, 31c are held so as to protrude inward. The radial positions of the blades 31a, 31b, 31c with respect to the blade holding member 32 can be adjusted, and are adjusted in advance according to the outer diameter of the workpiece W and the cutting amount. A pulley 36 is provided on the outer peripheral surface of the blade holding member 32. A drive belt 38 is stretched between the pulley 36 of the blade holding member 32 and the pulley 37 of the cutting motor 34, and the blade holding member 32 is rotated around the central axis of the blade holding member 32 by the driving force from the cutting motor 34. To do. The rotation centers of the above-described blade tools 31a, 31b, and 31c coincide with the central axis of the blade tool holding member 32.

  The cutting table 33 supports the blade holding member 32 via a bearing 39, and supports the blade holding member 32 so as to be rotatable around the central axis. The cutting motor 34 rotates the blade tools 31a, 31b, and 31c around the rotation center by rotating the blade holding member 32 as described above. In the cutting unit 4, the rotation centers of the blade tools 31 a, 31 b, and 31 c coincide with the center axis of the blade holding member 32 and are fixed. For this reason, the cutting unit 4 processes the workpiece W while centripetally using the cutting tools 31a, 31b, and 31c so that the cutting resistance received by the workpiece W is equal to the cutting tools 31a, 31b, and 31c. .

  The burnishing unit 5 is arranged on the downstream side of the cutting unit 4 in the transport direction. The burnishing unit 5 performs burnishing on the outer peripheral surface of the workpiece W. The burnishing unit 5 includes a plurality of burnishing rollers 41, a burnishing roller holding member 42, a drive shaft portion 43, a burnishing motor 44, a fixing flange 45, and a burnishing stand, as shown in FIGS. A portion 46 and a head portion 47.

  As shown in FIGS. 4 and 5, the plurality of burnishing rollers 41 are arranged around a predetermined center of rotation. Each burnishing roller 41 is provided so as to be rotatable with respect to the burnishing roller holding member 42. As shown in FIG. 4, the burnishing roller 41 is arranged such that the center axis X5 of the burnishing roller 41 is inclined by a minute angle with respect to the center axis X4 of the burnishing roller holding member 42. Further, the burnishing roller 41 has a shape having a larger diameter toward the upstream side in the transport direction.

  The burnishing roller holding member 42 has a cylindrical shape, and supports a plurality of burnishing rollers 41 so as to be rotatable around the central axis X <b> 5 of each burnishing roller 41. The burnishing roller holding member 42 is provided with a plurality of openings 48 penetrating the burnishing roller holding member 42 in the radial direction. These openings 48 are arranged at equal intervals in the circumferential direction of the burnishing roller holding member 42, and are provided corresponding to the plurality of burnishing rollers 41. A burnishing roller 41 is inserted into each of these openings 48, and the burnishing roller holding member 42 is arranged so that the outer peripheral surface of the burnishing roller 41 protrudes radially inward from the inner peripheral surface of the burnishing roller holding member 42. The burnishing roller 41 is held. The outer peripheral surface of the burnishing roller 41 also protrudes radially outward from the outer peripheral surface of the burnishing roller holding member 42. The burnishing roller 41 can rotate around the center axis X5 of each burnishing roller 41, and can revolve around the center axis X4 by rotating the burnishing roller holding member 42 around the center axis X4. That is, the center axis X4 of the burnishing roller holding member 42 coincides with the rotation center of the revolution shaft of the burnishing roller 41 described above. Thereby, the burnishing roller 41 can apply the force which sends the workpiece W to a conveyance direction, pressing the outer peripheral surface of the workpiece W and performing burnishing. The rotation center of the revolution shaft of the burnishing roller 41 also coincides with the rotation center of the cutting tools 31a, 31b, 31c of the cutting unit 4.

  The drive shaft 43 is arranged side by side with the burnishing roller holding member 42 in the central axis X4 direction, and is connected to the burnishing roller holding member 42. A pulley 14 is provided on the outer peripheral surface of the drive shaft portion 43. The drive belt 16 is stretched between the pulley 14 of the drive shaft 43 and the pulley 15 of the burnishing motor 44, and the drive shaft 43 is rotated by the driving force from the burnishing motor 44. As a result, the burnishing roller holding member 42 rotates.

  The fixed flange 45 supports the drive shaft portion 43 via the bearings 17 and 18, and supports the drive shaft portion 43 in a rotatable manner. The burnishing table 46 supports the fixed flange 45.

  The head portion 47 has a cylindrical shape and is inserted between the inner peripheral surface of the fixed flange 45 and the outer peripheral surface of the burnishing roller holding member 42. The inner peripheral surface of the head portion 47 is inclined so as to have a smaller diameter toward the downstream side in the transport direction, and comes into contact with the outer peripheral surface of the burnishing roller 41 that protrudes radially outward from the burnishing roller holding member 42. Further, the head portion 47 can change its position in the transport direction with respect to the fixed flange 45 and the burnishing roller holding member 42. For this reason, by adjusting the position of the head portion 47 in the transport direction, the pressing force to the burnishing roller 41 by the inner peripheral surface of the head portion 47 can be adjusted. The pressing load on the workpiece W can be adjusted.

  The second conveyor unit 6 is disposed on the downstream side of the burnishing unit 5 in the transport direction, and includes a second conveyor base 51, a plurality of second conveyor rollers 52, and a conveyor motor 53. The 2nd conveyor base part 51 is supporting the some 2nd conveyor roller 52 rotatably. The plurality of second conveyor rollers 52 are arranged side by side in the transport direction. The workpiece W is conveyed on the second conveyor roller 52 while being in contact with the second conveyor roller 52. In FIG. 1, only one second conveyor roller 52 is assigned a reference numeral, and the other second conveyor rollers 52 are omitted. The conveyor motor 53 rotates a part of the second conveyor rollers 52 among the plurality of second conveyor rollers 52. As a result, the workpiece W moves on the second conveyor roller 52. The other second conveyor rollers 52 are driven to rotate as the workpiece W moves.

[Cutting burnishing method]
Hereinafter, a cutting burnishing method using the above-described cutting burnishing apparatus 1 will be described.

  First, the workpiece W is placed on the first conveyor roller 12 of the first conveyor unit 2, and the tip of the workpiece W is disposed at the entrance of the transport unit 3. And the process of conveying the workpiece W by the conveyance unit 3 is performed. In this step, the holding roller 21 of the transport unit 3 is disposed at the feed position. The workpiece W is fed in the transport direction by the rotation of the restraining roller 21 while being sandwiched between the restraining roller 21 and the support rollers 23 and 24. A sensor 13 provided at the outlet of the transport unit 3 detects the passage of the front end of the transport unit 3 and sends a detection signal to the controller 28.

  When the workpiece W reaches the cutting unit 4, the cutting unit 4 performs a step of cutting the outer peripheral surface of the workpiece W. In this step, the outer peripheral surface of the workpiece W is cut while the workpiece W is centered by rotating the cutting tools 31a, 31b, 31c around the workpiece W. At this time, a portion of the workpiece W upstream of the cutting unit 4 in the conveyance direction is held by the holding roller 21 and the support rollers 23 and 24 of the conveyance unit 3. The conveyance unit 3 holds the workpiece W against the rotational force applied to the workpiece W by the cutting tools 31a, 31b, and 31c, and further sends the workpiece W in the conveyance direction.

  When the tip of the workpiece W reaches the burnishing unit 5, a step of burnishing the outer peripheral surface of the workpiece W in the burnishing unit 5 is performed. In this step, the outer peripheral surface of the workpiece W is pressed by the burnishing roller 41 to perform burnishing. At this time, the outer peripheral surface of the workpiece W is pressed by the plurality of burnishing rollers 41, and the center axis X5 of the burnishing roller 41 is inclined with respect to the center axis X4 of the burnishing roller holding member 42. Is given thrust. Thereby, the workpiece W is further sent in the conveyance direction.

  Moreover, the process of conveying the workpiece W by the conveyance unit 3 described above is performed until the workpiece W reaches the burnishing unit 5. That is, when the tip of the workpiece W reaches the burnishing unit 5, the controller 28 of the transport unit 3 moves the holding roller 21 to the open position. As a result, the holding of the workpiece W by the transport unit 3 is released. However, the part of the workpiece W on the downstream side in the transport direction from the cutting unit 4 is held by the burnishing roller 41 of the burnishing unit 5. For this reason, the burnishing unit 5 holds the workpiece W against the rotational force applied to the workpiece W by the cutting tools 31a, 31b, 31c in the cutting unit 4.

  When the workpiece W is conveyed in the conveying direction by the burnishing unit 5, the rear end of the workpiece W passes through the cutting unit 4. Then, when the workpiece W is further conveyed, the rear end of the workpiece W passes through the burnishing unit 5. Thereby, the cutting and burnishing to the workpiece W are completed. The workpiece W is transported in the transport direction by the second conveyor unit 6 and is taken out from the burnishing unit 5.

  The conveyance speed by the conveyance unit 3 and the second conveyor unit 6, the cutting conditions at the cutting unit 4, and the burnishing conditions at the burnishing unit 5 are as follows in the conveyance unit 3, the second conveyor unit 6, the cutting unit 4, and the burnishing unit 5. , Respectively. For example, for the workpiece W having the size as described above, the cutting conditions are as follows: cutting speed Vc = 100 to 200 m / min, feed fc = 0.1 to 0.5 mm / rev, cutting depth t (r) = 0.1 to 0.5 mm Set to The burnishing conditions are as follows, for example, when the outer diameter of the burnishing roller 41 is 10 mm: rotational speed Vv = 100 to 200 m / min, feed fv = 0.1 to 0.5 mm / rev, pressing load N = 50 to 500 N Is set. Further, the cutting speed Vc and feed fc in the cutting unit 4, the rotational speed Vv and feed fv in the burnishing unit 5, and the transport speed by the transport unit 3 and the second conveyor unit 6 are set in advance so as to correspond to each other. It is set via three, four, and five controllers (not shown except for the controller 28). The cutting condition cutting depth t (r) is set by adjusting the amount of protrusion of the blades 31a, 31b, 31c from the inner peripheral surface of the blade holding member 32. The pressing load of the burnishing condition is set by adjusting the transport direction position of the head portion 47.

[Characteristic]
As described above, in the cutting burnishing apparatus 1, cutting and burnishing can be continuously performed without rotating the workpiece W. For this reason, the problem by rotating the bending workpiece W as mentioned above does not generate | occur | produce. Further, the workpiece W required for cutting can be held by the transport unit 3 and the burnishing unit 5 in a shared manner. For this reason, cutting and burnishing can be performed continuously. Thereby, cutting and burnishing can be continuously performed with high accuracy even on the outer peripheral surface of the workpiece W having a bend.

  Further, the workpiece W is held by the transport unit 3 until the workpiece W reaches the burnishing unit 5, and after the workpiece W reaches the burnishing unit 5, the workpiece W is moved by the burnishing unit 5. Retained. For this reason, the period during which the workpiece W is held by both the transport unit 3 and the burnishing unit 5 can be shortened. Thereby, it can suppress that the to-be-centered in the cutting unit 4 becomes obstructed by the workpiece W being held by both the transport unit 3 and the burnishing unit 5. In addition, it is possible to eliminate a mismatch in feed speed synchronization that may occur when a workpiece is transported by a plurality of transport units.

[Other Embodiments]
(A) In the above embodiment, three cutting tools 31a, 31b, 31c are provided in the cutting unit 4, but four or more cutting tools 31a, 31b, 31c may be provided. Further, the number of burnishing rollers 41 in the burnishing unit 5 is not limited to the above.

  (B) In the above embodiment, when the tip of the workpiece W reaches the burnishing unit 5, the holding by the transport unit 3 is released, but when the tip of the workpiece W reaches the burnishing unit 5. May be released after a short time elapses. That is, when the leading end of the workpiece W reaches the burnishing unit 5 and advances in the transport direction by a predetermined distance, the holding by the transport unit 3 may be released.

  (C) In the above embodiment, the sensor 13 is provided at the exit of the transport unit 3, but the sensor 13 may be provided at other locations such as the entrance of the transport unit 3 and the entrance of the burnishing unit 5.

  (D) In the above embodiment, the conveyance speed, cutting conditions, and burnishing conditions are set in the conveyance unit 3, the second conveyor unit 6, the cutting unit 4, and the burnishing unit 5, respectively. A controller that controls the conveyor unit 6, the cutting unit 4, and the burnishing unit 5 may be set all at once.

  INDUSTRIAL APPLICABILITY The present invention has an effect that cutting and burnishing can be performed continuously and accurately even on an outer peripheral surface of a bent workpiece, and is useful as a cutting burnishing apparatus and a cutting burnishing method. is there.

3 Conveying unit 4 Cutting unit 5 Burnishing units 31a, 31b, 31c Cutting tool 34 Cutting motor (drive device)
41 burnishing roller

Claims (4)

At least three cutting tools arranged side by side around a predetermined rotation center, and a drive device that rotates the cutting tool around the rotation center, and centroiding the workpiece by the cutting tool, A cutting unit for cutting the outer peripheral surface;
A burnishing having a plurality of rollers for applying a force for feeding the workpiece in the conveying direction while performing burnishing by pressing the outer peripheral surface of the workpiece, and disposed on the downstream side of the cutting unit in the conveying direction Unit,
A transport unit that is disposed upstream of the cutting unit in the transport direction, and that feeds the work in the transport direction while holding the work until the work reaches the burnishing unit;
A cutting burnishing apparatus comprising: The transport unit releases the hold on the workpiece after the workpiece reaches the burnishing unit;
The cutting burnishing apparatus according to claim 1. In a cutting unit having at least three cutting tools arranged side by side around a predetermined rotation center and a driving device for rotating the cutting tool around the rotation center, the workpiece is centrifuged while the workpiece is centroided by the cutting tool. Cutting the outer peripheral surface of the object,
A burnishing having a plurality of rollers for applying a force for feeding the workpiece in the conveying direction while performing burnishing by pressing the outer peripheral surface of the workpiece, and disposed on the downstream side of the cutting unit in the conveying direction In the unit, a step of burnishing the outer peripheral surface of the workpiece;
A step of transporting the workpiece until it reaches the burnishing unit by a transport unit that is arranged upstream of the cutting unit in the transport direction and that sends the workpiece in the transport direction while holding the workpiece;
A cutting burnishing method comprising: In the step of conveying the workpiece until it reaches the burnishing unit, the conveyance unit releases the hold on the workpiece after the workpiece reaches the burnishing unit.
The cutting burnishing method according to claim 3.

Images