JP2014148026A - Workpiece vibration suppression device for cylindrical grinding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration suppression device the lifetime of which is prolonged, for a cylindrical workpiece.SOLUTION: In a vibration suppression device 10, two shoe arms 13a, 13b capable of moving back and forth are mounted to left and right sides of a shoe arm mount frame body 12a, in a semi-arcuate shape, provided in an upper part of a pedestal 11 so as to form an included angle of 120° toward a rotation axis center O of a virtual workpiece. A shoe arm 13c which is movable back and forth, is mounted to a shoe arm mount frame body 12b in a 1/4 arcuate shape so as to be vertical toward the rotation axis center O. The three shoe arms 13a, 13b, 13c are mounted in such a manner that heads of the shoe arms become vertex positions of a virtual regular triangle when the shoe arms move toward the rotation axis center O and are brought into contact with the outer periphery of the workpiece.

Description

  In the present invention, the inner surface of a cylindrical workpiece that is rotatably held by the workpiece chuck mechanism of the inner surface cylindrical grinding device is subjected to cylindrical grinding with a rotating grindstone, or rotated when a taper is ground on the edge of the workpiece end surface. The present invention relates to a work vibration suppressing device attached to the outer periphery of a work in order to suppress vibration of the work to be performed.

  As disclosed in Japanese Patent Application Laid-Open No. 2000-24805 (Patent Document 1), the inner surface of a cylindrical workpiece that is rotatably held by a workpiece chuck mechanism is subjected to cylindrical grinding with a rotating grindstone, or on the workpiece end surface. An internal cylindrical grinding device for grinding a taper is known. As disclosed in Non-Patent Document 1, Okamoto Machine Tool Co., Ltd. manufactures and sells an internal cylindrical grinder “IGM15” (trade name).

  Japanese Patent Laying-Open No. 2005-169518 (Patent Document 2) supports a workpiece by abutting a freely moving workpiece rest on a grinding portion of a rotating workpiece and feeding a rotating grindstone to the workpiece. A cylindrical grinding method in which cutting is performed while feeding at a speed, and an in-process gauge arm is brought into contact with an external grinding portion of the workpiece, and the workpiece is ground to a predetermined diameter while measuring the diameter of the grinding portion. The workpiece rest is retracted from the workpiece when a missing portion or a projection generated during grinding of the workpiece by the rotating grindstone is detected. In addition, a grinding method is disclosed in which the work rest is retracted and at the same time the feed speed of the rotating grindstone is slower than the feed speed before detecting the missing part or the protrusion.

  Furthermore, Japanese Patent Application Laid-Open No. 2007-301642 (Patent Document 3) discloses a machining program that uses a grinding wheel as a tool and a thread cutting cycle [G33 code of JIS B6314] as a G function. When using a numerically controlled grinding machine equipped with this machining program to grind a substantially parabolic groove on the outer peripheral surface of the crowning roll by the relative movement of the crowning roll (work) and the grinding wheel A grinding method is disclosed in which a compressed air is ejected from a semi-cylindrical static pressure gas bearing device below the workpiece toward the workpiece to prevent dripping due to gravity at the center of the workpiece.

  Furthermore, as shown in FIG. 5, JP 2010-89230 A (Patent Document 4) discloses an annular dog body 2 having a central hole 2a into which a workpiece w is inserted, on one side of the annular dog body 2. A pair of springs 5 for applying a biasing force to the workpiece clamping cam 3 provided symmetrically on both the left and right sides of the peak portion 3a of the workpiece clamping cam 3 and supported around the rotation support shaft 4 provided in the recess 7. 5, 5 from the outer peripheral wall side of the annular dog body 2 so that the crest 3a of the workpiece clamping cam 3 and the tips 6a, 6b of the pair of clamping adjusting bolts 6, 6 form the apex of an equilateral triangle. It is disclosed that an automatic dog 1 having clamping adjustment bolts 6 and 6 provided so as to be able to advance and retreat toward the center is attached to a cylindrical grinding apparatus.

  The above Patent Documents 2 to 4 relate to an outer cylindrical grinding apparatus. When grinding the inner surface of a long cylindrical workpiece with the grinding wheel of the internal cylindrical grinding device, the workpiece ground by the vibration of the workpiece due to the drooping of the workpiece due to its own weight or the vibration of the internal grinding wheel becomes a drum shape. May be ground. Grinding in such a drum shape also occurs when grinding with a new long cylindrical workpiece. The latter cause is due to a difference of 0.05 to 0.3 mm between the outer diameter of the workpiece that has been previously internally ground and the outer diameter of the workpiece that has been newly internally ground.

  Therefore, when the inner surface of a long cylindrical workpiece is subjected to cylindrical grinding with the grinding wheel of the inner cylindrical grinding device, an in-process gauge three-point workpiece outer diameter measuring device (for example, Marpos, Omron, FANUC, etc. Is mounted on the front surface of the fixed plate for fixing the work chuck of the internal cylindrical grinding machine, and there are three in-process gauge contacts at the work outer peripheral position (position B shown in FIG. 4) that is farther from the work chuck side and closer to the grinding wheel shaft side. As shown in the in-circle diagram of FIG. 4, the outer diameter of the workpiece is reduced by forming a right-angled isosceles triangle at the point of contact with the workpiece on the horizontal plane including the workpiece vertex, workpiece bottom point, and workpiece rotation axis. In addition to measuring, the cylindrical inner surface of the workpiece is ground with the in-process gauge 3-point workpiece outer diameter measuring device attached even during machining to suppress workpiece vibration. To have.

Published by Okamoto Machine Tool Mfg. Co., Ltd., "Internal Grinding Machines-IGM15EXIII, IGM15NCIII, IGM15NCIII-2 Spindle", February 2011, 3,000 copies.

JP 2000-24805 A JP 2005-169518 A JP 2007-301642 A JP 2010-89230 A

  If the three-point workpiece outer diameter measuring device is attached and the inner surface of the long workpiece is subjected to cylindrical grinding for a long time, the three contacts contact the workpiece and grinding is performed. The contact head is worn out in a short period of time, and the replacement time of the contact of the three-point workpiece outer diameter measuring device is early (the contact life is short). In addition, since the length of the shoe arm provided with a contact at the tip of the three-point work outer diameter measuring device is limited, the position where the contact contacts the work outer periphery depends on the length of the work to be internally ground. There is a drawback that the position is farther away.

  An object of this invention is to provide the workpiece | work vibration suppression apparatus attached to the cylindrical inner surface grinding apparatus from which the exchange time of a shoe arm provided with a contactor becomes longer.

According to the first aspect of the present invention, the semi-arc-shaped shoe arm mounting frame (12a) is fixed to the upper portion of the base (11), and the quarter-arc-shaped shoe arm mounting frame (12b) is rotatable. To form a shoe arm mounting frame (12),
The two-arm shoe arms (13a, 13b) that can move forward and backward on the left and right sides of the semi-arc-shaped shoe arm mounting frame (12a) have an included angle of 120 degrees toward the virtual rotation axis (O) of the workpiece. Attach one shoe arm (13c) that can move forward and backward to the 1/4 arc-shaped shoe arm mounting frame (12b) so as to be perpendicular to the rotational axis (O), When the three shoe arms (13a, 13b, 13c) advance toward the rotational axis (O) and come into contact with the outer periphery of the workpiece (w), the tip end of the shoe arm becomes the apex position of the virtual equilateral triangle. Attach shoe arms (13a, 13b, 13c) to
and,
The 1/4 arc-shaped shoe arm mounting frame (12b) is provided with a rotation stop positioning mechanism (14).
A workpiece vibration suppressing device (10) is provided.

  When the cylindrical workpiece is internally ground with a grindstone, the ¼ arc-shaped shoe arm mounting frame 12b is rotated so as to move upward so that the tip end of the shoe arm 13c does not contact the workpiece, so the outer periphery of the workpiece is 2 The contact force at that point is in contact with the shoe arms 13a and 13b, and the contact force at that time is lower than the contact force when using the conventional in-process gauge three-point work outer diameter measuring device, and the tips of the shoe arms 13a and 13b Head wear is reduced. Further, by moving the ¼ arc-shaped shoe arm mounting frame 12b upward, the work is mounted on the work chuck of the cylindrical inner surface grinding device, or the work is removed from the work chuck and the work is recovered. Becomes easy.

  Since the workpiece vibration suppressing device 10 can be installed on the work table of the cylindrical inner surface grinding device, the workpiece vibration suppressing device 10 can be installed on the side portion closer to the grindstone axis of the workpiece. Therefore, when the cylindrical workpiece is internally ground with a grindstone, the contact force of the shoe arms 13a and 13b with which the outer periphery of the workpiece comes into contact is reduced compared to the contact force when using the conventional in-process gauge three-point workpiece outer diameter measuring device.

  The workpiece vibration suppression device 10 can also be used as a workpiece outer diameter measuring device.

FIG. 1 is a side view of the workpiece vibration suppressing device. FIG. 2 is a front view of the workpiece vibration suppressing device. FIG. 3 is a diagram for explaining a rotation stop positioning mechanism for a ¼ arc-shaped shoe arm mounting frame of the workpiece vibration suppressing device. FIG. 4 is a front view for explaining a position where the workpiece vibration suppressing device is placed on the work table of the cylindrical inner surface grinding device. FIG. 5 is a front view of a dog used in the outer cylindrical grinding apparatus. (Known)

  A manual work vibration suppression device 10 shown in FIGS. 1 and 2 fixes a semi-arc-shaped shoe arm mounting frame 12 a to the upper portion of a base 11 and rotates a grip arm handle 15 around a rotation pin 16. The shoe arm attachment frame 12 is configured by attaching a ¼ arc-shaped shoe arm attachment frame 12b that can be rotated by being moved.

  Attach two shoe arms 13a and 13b that can be moved forward and backward to the left and right of the semi-arc-shaped shoe arm mounting frame 12a so as to have an angle of 120 degrees toward the rotation axis O of the virtual work w, A shoe arm 13c that can be moved forward and backward is attached to the 1/4 arc-shaped shoe arm attachment frame 12b so as to be perpendicular to the rotation axis O, and the three shoe arms 13a, 13b, and 13c are attached to the frame. The shoe arms 13a, 13b, and 13c are attached so that the tip end of the shoe arm when moving toward the rotation axis O and contacting the outer periphery of the workpiece w is the apex position of the virtual equilateral triangle.

  The forward and backward movements of the shoe arms 13a, 13b, and 13c are performed by the air cylinder mechanism 17, and when the tip end of the shoe arm comes into contact with the outer periphery of the workpiece, the crank pin 18 advances toward and comes into contact with the shoe arms 13a, 13b, and 13c. Fix the arm position.

As shown in FIG. 3, the rotation stop positioning mechanism 14 includes a locating pin 14 a on the ¼ arc-shaped shoe arm mounting frame 12 b, and a semi-arc-shaped shoe arm mounting frame on the upper side of the base 11. A locking piece 14c provided with a locking groove is provided at the head portion rotatably attached around the rotation support pin 14b provided on the fixing portion 12a, and the locking groove of the locking piece 14c serves as the positioning pin. 14a, the rotation stop position of the ¼ arc-shaped shoe arm mounting frame 12b is determined.

  If the numerically controlled workpiece vibration suppression device 10 using a position sensor is used for the forward or backward movement of the shoe arms 13a, 13b, 13c of the workpiece vibration suppression device 10 to be driven by an actuator or servo motor, the outer diameter of the workpiece is automatically measured. it can.

  Next, the work vibration suppressing device 10 is installed on a work table (working spindle) of a cylindrical inner surface grinding device, and the work vibration suppressing device 10 is used for cylindrical grinding of the inner surface of the work w mounted on the work chuck 30. Will be explained.

  The work vibration suppressing device 10 is placed on the work table at a position depicted by a virtual line A frame in FIG.

  The ¼ arc-shaped shoe arm mounting frame 12b of the work vibration suppressing device 10 is rotated leftward about the rotation support pin 14b and moved to the position of the shoe arm 13c indicated by the phantom line in FIG. Next, the locking piece 14c of the rotation stop positioning mechanism 14 is rotated counterclockwise so that the locking groove of the locking piece 14c is brought into contact with the positioning pin 14a, so that the bottom of the shoe arm mounting frame 12b. Positioning to prevent rotational movement in the direction.

  The work is mounted on the work chuck 30.

  The locking piece 14c is rotated clockwise around the rotation support pin 14b to release the locking groove from the positioning pin 14a, and the 1/4 arc-shaped shoe arm mounting frame 12b is rotated in the descending direction to stop at the stop position. stop.

  The shoe arms 13a, 13b, and 13c are advanced toward the workpiece axis O by the air cylinder mechanism 17 and brought into contact with the workpiece w, and the workpiece outer diameter is measured. When the three shoe arms 13a, 13b, and 13c advance toward the rotational axis O and come into contact with the outer periphery of the workpiece, the tip end of the shoe arm is the apex position of the virtual equilateral triangle. The tip end of the shoe arm 13c is located on a vertical plane including the rotation axis O of the workpiece.

  When the measurement of the workpiece outer diameter is completed, the ¼ arc-shaped shoe arm mounting frame 12b of the workpiece vibration suppressing device 10 is rotated leftward about the rotation support pin 14b, and is indicated by a virtual line in FIG. Move to the position of the shoe arm 13c. Next, the locking piece 14c of the rotation stop positioning mechanism 14 is rotated counterclockwise so that the locking groove of the locking piece 14c is brought into contact with the positioning pin 14a, so that the bottom of the shoe arm mounting frame 12b. Positioning to prevent rotational movement in the direction. The workpiece w comes into contact with the tip ends of the two shoe arms 13a and 13b.

  While rotating the workpiece chuck 30 of the cylindrical inner surface grinding device to rotate the workpiece around the workpiece axis O, the grinding wheel shaft is advanced in the workpiece direction to perform cylindrical grinding, grooving, and taper machining of the inner surface or end surface of the workpiece. Start. Grinding is performed by relative movement of the workpiece and the grindstone. When the cylindrical inner surface grinding of the workpiece is completed, the grindstone is moved backward and the rotation of the workpiece chuck is stopped.

  Next, the ¼ arc-shaped shoe arm mounting frame 12b of the work vibration suppressing device 10 is rotated leftward about the rotation support pin 14b and moved to the position of the shoe arm 13c indicated by the phantom line in FIG. Let Next, the locking piece 14c of the rotation stop positioning mechanism 14 is rotated counterclockwise so that the locking groove of the locking piece 14c is brought into contact with the positioning pin 14a, so that the bottom of the shoe arm mounting frame 12b. Positioning to prevent rotational movement in the direction.

  The grinding work w is removed from the work chuck 30.

  The workpiece vibration suppression device 10 of the present invention can measure the outer diameter of a workpiece, and the wear amount at the tip of the shoe arm tip is an in-process gauge three-point workpiece used as a workpiece vibration suppression device of a cylindrical inner surface grinding device. Since it is smaller than the wear amount of the tip end (measuring element) of the shoe arm of the outer diameter measuring device, it can be effectively used as a workpiece vibration suppressing device of a cylindrical inner surface grinding device.

DESCRIPTION OF SYMBOLS 10 Work vibration suppression apparatus 11 Base 12 Shoe arm attachment frame 12a Semi-arc-shaped shoe arm attachment frame 12b 1/4 Arc-shaped shoe arm attachment frame 13a, 13b, 13c Shoe arm O Rotation center 14 of a workpiece | work Rotation stop positioning mechanism 30 Work chuck w Work

Claims (1)

The shoe arm mounting frame (12a) is fixed to the upper part of the base (11), and the shoe arm mounting frame (12b) is attached with a rotatable 1/4 arc-shaped shoe arm mounting frame (12b). Make up the body (12),
The two-arm shoe arms (13a, 13b) that can move forward and backward on the left and right sides of the semi-arc-shaped shoe arm mounting frame (12a) have an included angle of 120 degrees toward the virtual rotation axis (O) of the workpiece. Attach one shoe arm (13c) that can move forward and backward to the 1/4 arc-shaped shoe arm mounting frame (12b) so as to be perpendicular to the rotational axis (O), When the three shoe arms (13a, 13b, 13c) advance toward the rotational axis (O) and come into contact with the outer periphery of the workpiece (w), the tip end of the shoe arm becomes the apex position of the virtual equilateral triangle. Attach shoe arms (13a, 13b, 13c) to
and,
The 1/4 arc-shaped shoe arm mounting frame (12b) is provided with a rotation stop positioning mechanism (14).
A workpiece vibration suppression device (10) characterized by the above.

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