JP2008291311A - Automatic stage-changing mechanism for workpiece in hardening apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic stage-changing mechanism for a workpiece with which the stage-change of the workpiece in a hardening apparatus can easily be performed. <P>SOLUTION: Rotating members 7a, 7b composed of a cam for laying the workpiece 3, are arranged and the workpiece 3 is laid on a prescribed height by rotating the rotating members 7a, 7b. The plurality of rotating members 7a, 7b are set in the longitudinal direction of the workpiece 3, and the workpiece 3 is supported with the plurality of rotation members 7a, 7b. The plurality of rotating members 7a, 7b are set in symmetrical positions to the perpendicular line passed through the center of the workpiece 3 by observing the workpiece 3 in the longitudinal direction. Then, the rotating members symmetrically disposed to the perpendicular line passed through the center of the workpiece 3, are rotated in opposite directions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a workpiece changing mechanism provided in a quenching apparatus for quenching a cylindrical workpiece (material of a machine part) or a rack.

  The workpiece is quenched to ensure strength (abrasion resistance and fatigue resistance). There are various quenching methods. Among them, induction hardening is performed by placing a heating coil in the vicinity of the workpiece and supplying an induction current in the workpiece by supplying a high-frequency current to the heating coil. The workpiece is heated and quenched.

  Here, in order to perform quenching, it is necessary to keep the distance (interval) from the workpiece to the heating coil at a distance (interval) suitable for quenching. However, since the size of the work varies, the position of the heating coil must be changed each time according to the size of the work when changing the setup.

  Here, “replacement” refers to the setting of quenching a workpiece of a certain size when quenching a workpiece of a plurality of sizes with the same quenching machine. Refers to the work to change to the setting. Since the quenching operation cannot be performed during the workpiece change and the product production line needs to be stopped, it is desirable to reduce the time required for the change as much as possible.

  Therefore, conventionally, in order to facilitate changeover (installation of the heating coil), the center position of the workpiece is matched with a predetermined position set in the quenching device, and the installation position of the heating coil is calculated from the workpiece diameter data. Then, the heating coil was moved to the calculated position.

  Specifically, a plurality of types of V blocks having different sizes according to the size of the work are prepared, and the center position of the work is made to coincide with a predetermined position set in the quenching apparatus by the V block, Further, the position where the heating coil should be installed is calculated from the center position data and diameter data of the workpiece, and the heating coil is moved to the calculated position.

  In other words, the quenching device is provided with center pins and chucks for aligning both ends of the workpiece at predetermined positions. The center pin sets the workpiece installation height so that the workpiece can be quenched. It has become.

However, this method can only handle workpieces of a predetermined size. When quenching workpieces of different sizes, the center position of the workpiece is set to the center pin each time depending on the size of the workpiece. The work of resetting to the position of the chuck is very complicated.
Therefore, in order to make the center of the workpiece of an arbitrary size within a predetermined range coincide with the center pin and to facilitate the change of the workpiece, the present applicant has created the invention disclosed in Patent Document 1.
JP 2000-282135 A

  By the way, in the invention of Patent Document 1, a displacement mechanism for displacing the height of the workpiece is provided, and the center of the workpiece is aligned with the center pin by this displacement mechanism. However, this displacement mechanism has a complicated structure and a large number of components, which leads to an increase in the size of the quenching device, and is always satisfactory in the current trend where downsizing and space saving of the device are strongly desired. It wasn't.

  Therefore, an object of the present invention is to provide a workpiece automatic change mechanism that can easily change workpieces in a quenching apparatus.

  In order to solve the above-mentioned problem, the workpiece automatic change mechanism according to the invention of claim 1 is a workpiece change device in a quenching apparatus, wherein a rotation member comprising a cam for placing the workpiece on a rotating shaft is provided, The workpiece was set at a predetermined height by rotating the rotating member.

  When the invention of claim 1 is implemented, the workpiece can be changed with a simple configuration. Here, as the cam, a disc (column) having a decentered rotation center, an elliptical shape or the like having a smoothly undulating peripheral surface, or the like can be used. It is also possible to employ a polygonal column with an eccentric rotation axis or an unequal side polygonal column. That is, each surface of the unequal side polygonal column corresponds to a workpiece having a different diameter, and when the workpiece to be quenched is placed on any surface, the center of the workpiece is center pin (predetermined height) It is possible to employ an unequal side polygonal cylinder that can be matched to

  According to a second aspect of the present invention, in the workpiece automatic change mechanism according to the first aspect of the invention, a plurality of rotating members are arranged in the longitudinal direction of the workpiece, and the workpiece is supported by the plurality of rotating members.

  In the invention of claim 2, since the plurality of rotating members are arranged in the longitudinal direction of the work and the work is supported by the plurality of rotating members, the support of the work is stabilized.

According to a third aspect of the present invention, in the workpiece automatic setup change mechanism according to the first or second aspect of the present invention, two rotation shafts are provided, and each rotation shaft is provided with a rotation member. The workpiece is supported by the rotating member.
For example, rotation axes are arranged on both sides of a perpendicular line passing through the center of the workpiece.

  When the invention of claim 3 is carried out, the support of the workpiece can be stabilized.

  According to a fourth aspect of the present invention, in the automatic workpiece changing mechanism according to the third aspect of the invention, the rotating members arranged symmetrically with respect to the perpendicular passing through the center of the workpiece are configured to rotate in opposite directions.

  In the invention of claim 4, since the rotating members arranged symmetrically with respect to the perpendicular passing through the center of the workpiece are configured to rotate in opposite directions, the workpiece moves in the horizontal direction during the changeover. Can be avoided. That is, the work moves only in the vertical direction and is set at a predetermined height.

According to a fifth aspect of the present invention, in the automatic workpiece changing mechanism according to the first to fourth aspects of the present invention, the stop position of the rotating member is associated with the vertical surface dimension of the work perpendicular to the longitudinal direction.
Of the vertical surface dimensions, the height dimension (diameter or radius) is preferably associated with the stop position of the rotating member.

  When the invention of claim 5 is implemented, the stop position of the rotating member is associated with the size of the work, so that the work can be easily installed at a predetermined height.

  According to a sixth aspect of the present invention, in the workpiece automatic change-over mechanism according to the third to fifth aspects of the present invention, a gear is provided on each rotating shaft of the rotating member, and a power is transmitted to each gear by a motor provided with a driving gear. Configured to do.

According to the sixth aspect of the present invention, the rotating shaft of the rotating member that rotates integrally with each gear can be rotated and stopped by the motor. By associating the stop position (rotation angle) of the rotating member (rotating shaft) with the size of the workpiece, the workpiece can be easily and quickly changed.
In particular, when a step motor is employed, the rotating member can be accurately rotated and stopped by a predetermined angle.

  A seventh aspect of the present invention is the automatic workpiece changing mechanism according to any of the first to seventh aspects of the present invention, wherein the diameter or radius of the cylindrical or columnar workpiece and the rotation angle of the rotating member are set to the height of the center of the workpiece. Are related to each other.

  When the invention of claim 7 is carried out, the center position of the workpiece is fixed regardless of the diameter or radius of the workpiece, so that the arrangement of the heating coil at the time of quenching becomes easy.

  The invention according to claim 8 is the automatic workpiece changing mechanism according to claim 8, wherein the storage unit stores the rotation angle of the rotating member corresponding to the workpiece diameter or radius, and the input unit inputs the workpiece diameter or radius. The rotation angle of the rotating member corresponding to the diameter or radius of the workpiece input at the input unit is called from the storage unit.

  When the invention of claim 8 is carried out, the diameter or radius of the workpiece is input from the input section, and the rotating member rotates and moves to the corresponding rotation angle position, so that the center of the workpiece can be easily arranged at a predetermined height. become able to. Thereby, since the position of a workpiece | work is fixed, installation of a heating coil also becomes easy. It becomes possible to quickly change the workpiece.

  In the present invention, the workpiece can be changed with a simple configuration. The setup changing mechanism of the present invention has a simple configuration, further occupies a small space, and can reduce the size of the quenching apparatus. Further, the workpiece can be changed quickly, and a large number of workpieces can be quenched in a short time.

Hereinafter, the configuration of the automatic setup mechanism of the present invention will be described with reference to the drawings.
(First Example)
FIG. 1 is a side view of an automatic workpiece changing mechanism of a quenching apparatus embodying the present invention. 1A is changed to a setting suitable for quenching a workpiece having a relatively small size, and FIG. 1B is a setting corresponding to a relatively large workpiece to be quenched next time. (C) shows a state where a workpiece is placed with the setting of (b). FIG. 2A is a front view of a setup changing mechanism on which the workpiece of FIG. 1A is placed, and FIG. 2B is a front view of the setup changing mechanism on which the workpiece of FIG. 1C is placed. FIG. FIG. 3 is a perspective view of the automatic workpiece changing mechanism in the state of FIG. 1A, and FIG. 4 is a perspective view of the automatic workpiece changing mechanism in the state of FIG.

  As shown to Fig.1 (a), the automatic setup change mechanism 1 is installed on the machine stand 6 of a hardening apparatus. The automatic stage change mechanism 1 includes a first rotating member 7a, a second rotating member 7b, and a drive motor 10.

  As shown in FIGS. 2 (a) and 3, the first rotating member 7a has a shape like the outline of a conch whose outer diameter gradually changes, and as shown in FIGS. 1 (a) and 3 It has a predetermined thickness (width).

  A total of two such first rotating members 7a are provided in the vicinity of both ends of the shaft 8a at intervals. The shaft 8a is provided with a first gear 9a (gear). The first rotating member 7a and the first gear 9a are each provided with a key groove, and the shaft 8a is also provided with a corresponding key groove. A key 13a is mounted at a position where these key grooves coincide with each other, so that the first rotating member 7a and the first gear 9a can rotate integrally with respect to the shaft 8a. The two first rotating members 7a provided on the shaft 8a are in phase when viewed from the front as shown in FIGS. 2, 3, and 4, and support the workpiece 3 together with the second rotating member 7b described later. Be able to.

  Next, the second rotating member 7b has the same configuration as the first rotating member 7a. Further, a second gear 9b (gear) similar to the first gear 9a and two second rotating members 7b are passed through the shaft 8b, and can be rotated together with the shaft 8b by the key 13b. It has become. The shaft 8b is disposed in parallel with the shaft 8a and has the same length as the shaft 8a. The shaft 8a and the shaft 8b are supported on the machine base 6 by bearings 12, and are arranged symmetrically with respect to a perpendicular 30 passing through the center of a work 3a (3b) described later.

  As shown in FIGS. 3 and 4, the longitudinal positions of the two second rotating members 7b installed on the shaft 8b coincide with the positions of the two first rotating members 7a installed on the shaft 8a. Yes. However, this configuration is not essential, and may be configured as follows.

  That is, the arrangement of the first rotating member 7a and the second rotating member 7b may appear alternately when viewed from the side as shown in FIG. That is, for example, the first rotating member 7a, the second rotating member 7b, the first rotating member 7a, and the second rotating member 7b may be arranged in a staggered manner in order from the left side as viewed in FIG. Moreover, although the example in which the first rotating member 7a and the second rotating member 7b are provided in two on each of the shafts 8a and 8b is shown, three or more may be provided, and the workpiece 3 can be placed in a balanced manner. It is preferable to select such a number.

By the way, the first gear 9a provided on the shaft 8a and the second gear 9b provided on the shaft 8b mesh with the common third gear 11 (drive gear). That is, when the third gear 11 is rotated, the first gear 9a and the second gear 9b are simultaneously rotated in the same direction. The third gear 11 is rotationally driven by the drive motor 10. As the drive motor 10, for example, a step motor is preferably used and set to stop at a desired rotation angle. However, a resistance is provided for each predetermined angle on the circumference, and the first gear 9 a (first The rotation member 7a) and the second gear 9b (second rotation member 7b) may be easily stopped at a desired rotation position. Further, instead of the drive motor 10, a handle (not shown) capable of manually operating the third gear 11 may be provided, and the third gear 11 may be manually rotated.
The third gear 11 can be rotationally driven by various methods other than those described above. For example, the rack is directly engaged with the third gear 11, or the rack and the third gear 11 are connected via a pinion so that power can be transmitted, and the third gear 11 is rotated by reciprocating the rack. Is also possible.

Here, the first rotating member 7a provided on the shaft 8a and the second rotating member 7b provided on the shaft 8b have the same shape (periphery shape), but FIG. 2 (a) and FIG. 2 (b). As shown, the installation angles are different. This shape and installation angle are set as follows.
That is, a cylindrical or columnar workpiece 3 having various diameters (vertical surface dimensions) is placed on both rotating members. The center position of any workpiece 3 of any diameter is shown in FIG. The installation angle and the outer shape of both are set so as to coincide with the setting position 2a of the center pin 2 and the holding position of the chuck 27 of the quenching apparatus shown in FIG.

  In FIGS. 2A and 2B, the rotation centers of the first gear 9a and the second gear 9b do not move. That is, since the shaft 8a and the shaft 8b are supported by the bearing 12, when the third gear 11 rotates, the shaft 8a and the shaft 8b rotate at the place (height) where they are installed. Therefore, the distance from the center of the first gear 9a indicated by the symbol A in FIG. 2A to the center of the workpiece 3a is from the center of the first gear 9a indicated by the symbol B in FIG. 2B to the center of the workpiece 3b. Is the same as the distance. That is, the radius of the workpiece 3a and the radius of the workpiece 3b are different from each other by the dimension indicated by the symbol C, but the above-described distance A and distance B are the same.

  Thereby, the movement of the heating coil 4 shown to Fig.1 (a) becomes easy. That is, when quenching the workpiece 3, the heating coil 4 must be brought close to the workpiece 3, but when the automatic change mechanism 1 is configured as described above, the center of the workpiece 3a (3b) is set at the set position 2a. After that, if the diameter of the workpiece 3a (3b) is known, the reference position for installing the heating coil 4 becomes clear. Since the diameter of the workpiece 3a (3b) to be quenched is clear, the position where the heating coil 4 is installed can be obtained only by mechanical calculation.

  As shown in FIGS. 2A and 2B, the centers of the workpieces 3a and 3b having different diameters coincide with each other in the vertical direction. That is, the outer diameter of the first rotating member 7a and the outer diameter of the second rotating member 7b are set so that the center of the workpiece does not shift in the vertical direction corresponding to the size of the workpiece to be placed. As a result, the heating coil 4 of the quenching apparatus can approach (lower) and retreat (up) the workpiece to an appropriate position only by moving in the vertical direction.

  When actually quenching the workpiece 3, the workpiece 3 is conveyed to the automatic setup change mechanism 1 by a conveying device (not shown), and the workpiece 3 is placed on the rotating members 7a and 7b. The rotating members 7a and 7b rotate by an angle corresponding to the diameter of the workpiece 3, and lift the workpiece 3 until the center of the workpiece 3 coincides with the set position 2a. Thereafter, the chuck 27 grasps one end or both ends of the workpiece 3, and the rotating members 7a and 7b rotate to release the support of the workpiece 3. That is, in this state, the workpiece 3 is supported by the chuck 27, and the workpiece 3 and the rotating members 7a and 7b are separated from each other. Next, the heating coil 4 is moved to the vicinity of the workpiece 3, high frequency current is supplied, and the chuck 27 holding the workpiece 3 is rotated at high speed to quench the workpiece 3.

  When the quenching is completed, the rotating members 7a and 7b rotate again to support the workpiece 3 from below, and the chuck 27 releases the grip of the workpiece 3. Then, the workpiece 3 that has been tempered is delivered from the rotating members 7a and 7b to a conveying device (not shown).

The above operation will now be described with reference to FIGS.
FIG. 5 is a control system diagram of the automatic workpiece changeover mechanism of the present invention, and FIG. 6 is a control flow diagram for carrying out the present invention.

  As shown in FIG. 5, the automatic changeover mechanism 1 is provided with a control device 15 (CPU) including a calculation unit 16 and a storage unit 17. The control device 15 is connected to an input unit 18 (input interface) for inputting the size (diameter) of the workpiece 3 to be quenched.

  The storage unit 17 stores in advance a map that associates the rotation angles of the first rotating member 7a and the second rotating member 7b with the diameter of the workpiece 3 placed thereon. That is, when the diameter of the workpiece 3 to be quenched is determined and the first rotating member 7a and the second rotating member 7b are rotated according to the map, the workpiece 3 placed on the first rotating member 7a and the second rotating member 7b. Is aligned with the set position 2a shown in FIG.

  When the diameter of the workpiece 3 is input from the input unit 18 to the control device 15, the control device 15 stores the first rotating member 7 a and the second rotating member 7 b stored in the storage unit 17 corresponding to the diameter data of the workpiece 3. The rotation angle information of is obtained. Then, the control device 15 transmits a control signal to the drive motor 10 on the one hand to rotate the first rotating member 7a and the second rotating member 7b as described above, and also controls the heating coil driving unit 19 on the other hand. Send a signal. That is, when the diameter of the workpiece 3 centered at the fixed setting position 2a is determined, the position suitable for quenching of the heating coil 4 with respect to the workpiece 3 is determined. Therefore, it is preferable that information (height) of the movement destination of the heating coil 4 is also stored in association with the diameter of the workpiece 3 in the above-described map.

  When the storage capacity of the storage unit 17 is limited and information on the heating coil 4 cannot be stored, the calculation unit 16 can calculate the position of the moving destination of the heating coil 4 each time. Further, when quenching the workpiece 3 having a size that is not assumed in the created map, the rotation angle of the second gear 11 (the first rotating member 7a and the second rotating member 7b), the heating coil 4 The position (height) of the movement destination can also be obtained by calculating with the calculating unit 16.

  The automatic change-over mechanism 1 has a configuration as shown in FIG. 5 and operates according to a flowchart as shown in FIG. That is, when the quenching operation is started, the diameter of the workpiece to be quenched is first input to the control device 15 via the input unit 18. Here, there is a certain tolerance (about several millimeters) in the distance between the workpiece and the heating coil when quenching.

  The control device 15 determines whether or not the current position (height) of the heating coil 4 is within an allowable range with respect to the input diameter of the workpiece 3. If the input diameter of the workpiece 3 is within an allowable range with respect to the current setting of the heating coil 4, no change in the setting is necessary, and the heating coil 4 that has been immediately retracted is moved to a predetermined position. Then, the workpiece 3 is brought close to the workpiece 3 and further a high frequency current is supplied to perform quenching.

  Conversely, if the diameter of the input workpiece 3 is outside the allowable range with respect to the current setting of the heating coil 4, it is necessary to change the setting. In this case, the control device 15 drives the drive motor 10 and the heating coil drive unit 19 according to the map, or the rotation angles of the first rotation member 7a (cam) and the second rotation member 7b (cam), The calculating unit 16 calculates the moving distance of the heating coil 4, rotates the first rotating member 7 a and the second rotating member 7 b by a predetermined angle, and calculates and moves the height of the moving destination of the heating coil 4. The workpiece 3 is quenched.

  Although not shown in FIG. 6, when the workpiece 3 is changed and the center of the workpiece 3 coincides with the set position 2 a of the center pin 2, the retracted chuck 27 approaches and either one end of the workpiece 3 or Grip both ends. Then, the rotating members 7 a and 7 b that support the workpiece 3 from below rotate and move so as to be separated from the workpiece 3. When the quenching is completed, the control device 15 sends a control signal to the heating coil driving unit 19 to retract the heating coil 4 upward from the workpiece 3 in order to make it easy to replace the workpiece 3. The above operation procedure can also be stored in the storage unit 17 and controlled by the control device 15.

  And the workpiece | work 3 hardened from the 1st rotation member 7a and the 2nd rotation member 7b is taken out. If another workpiece 3 is not quenched, the operation is completed. If another workpiece 3 is quenched, the diameter of the workpiece 3 is input to the control device 15 via the input unit 18. Is entered. The following operations are the same as described above, and will be omitted.

  In addition, although the workpiece | work 3 of the diameter (size) of a predetermined range can be hardened with the same heating coil 4, if it exceeds the range, it is necessary to use another heating coil 4. FIG. When the diameter of the workpiece 3 is input, it is preferable that the control device 15 also determines whether or not the heating coil 4 needs to be replaced.

(Second embodiment)
Below, the Example of another automatic change-over mechanism provided in the same hardening apparatus as a 1st Example is described.
FIG. 7 is a front view of a workpiece automatic change mechanism 20 different from FIG. 2 of the quenching apparatus embodying the present invention. 7A is changed to a setting suitable for quenching a workpiece having a relatively small size, and FIG. 7B is a setting corresponding to a relatively large workpiece to be quenched next time. The state after the change is shown. FIG. 8 is a perspective view of the automatic workpiece changing mechanism in the state of FIG. 7A, and FIG. 9 is a perspective view of the automatic workpiece changing mechanism in the state of FIG. 7B.

  In the configuration of the automatic workpiece change mechanism 20 shown in FIG. 7A, the rotating members 21a and 21b are disks having the same size and a predetermined thickness (width), and the fourth gear 14 is a third gear. 11 and the second gear 9b are different from the configuration of the automatic changeover mechanism 1 of the first embodiment shown in FIG. Since the other configuration of the automatic workpiece change mechanism 20 is the same as that of the automatic change mechanism 1 of the first embodiment, the same reference numerals are given to the same components.

  In other words, the shaft 8a passes through the two rotating members 21a and the first gear 9a, and these can be rotated together by the key 13a. Similarly, the shaft 8b has two rotating members 21b and the second gear 9b. And these can be rotated together by the key 13b.

  When the drive motor 10 connected to the third gear 11 is driven, the first gear 9a is directly transmitted with power from the third gear 11, and the second gear 9b is transmitted from the third gear 11 via the fourth gear 14. Power is transmitted. In the automatic workpiece change mechanism 20 configured as described above, the rotating members 21a and 21b rotate in the opposite direction.

  If the workpiece 3a having a small diameter as shown in FIG. 7A is quenched and then the workpiece 3b having a large diameter as shown in FIG. Rotate around a predetermined angle. When the fourth gear 14 is provided, the rotating members 21a and 21b having a simpler shape (circular shape) than the case of the first embodiment can be employed. Therefore, when the automatic setup change mechanism is configured as in the second embodiment, the number of parts is increased by the amount of the fourth gear 14, but the rotating member is easier to process than the configuration of the first embodiment. Manufacturing cost can be reduced.

  Further, by providing the fourth gear 14, the rotating members 21a and 21b rotate in opposite directions, so that the shapes of the rotating members can be arranged in various ways. 10 (a), (b), (c), and FIGS. 11 (a), (b) are front views of the automatic changeover mechanism that employs rotating members having different shapes in FIG. 7 (a). .

  The outer shape of the left and right rotating members 22 in FIG. 10A is hexagonal, the outer shape of the left and right rotating members 23 in FIG. 10B is octagonal, and the left and right rotating members 24 in FIG. The external shape is a dodecagon. Moreover, an ellipse shape as shown in FIG. 11A or a substantially triangular shape as shown in FIG.

  In the first and second embodiments, gears (gears) are used to transmit power to the rotating member (cam), but power is transmitted by a mechanism other than a gear such as a drive belt or a chain. You may let them.

  In the embodiment, an example is shown in which the workpiece is placed directly on the rotating member. However, the present invention is not limited thereto, and the present invention can be implemented even if an inclusion is provided between the rotating member and the workpiece. is there.

It is a side view of the workpiece automatic change mechanism of the hardening apparatus which implemented this invention. (A) is changed to a setting suitable for quenching a workpiece having a relatively small size, and (b) is changed to a setting corresponding to a relatively large workpiece to be quenched next time. The state is shown, (c) has shown the state which mounted the workpiece | work by the setting of (b). (A) is a front view of the setting mechanism which mounted the workpiece | work of FIG. 1 (a), (b) is a front view of the setting mechanism which mounted the workpiece | work of FIG.1 (c). It is a perspective view of the automatic setup change mechanism of Fig.1 (a). It is a perspective view of the automatic setup change mechanism of FIG.1 (c). It is a control system diagram of a work automatic setup change mechanism. It is a work flowchart of a work automatic setup change mechanism. It is a front view of an automatic setup change mechanism different from Fig.2 (a). (A) has shown the state changed to mount a comparatively small workpiece | work, (b) has shown the state changed to place a comparatively big workpiece | work. It is a perspective view of the automatic setup change mechanism of the state of Fig.7 (a). It is a perspective view of the automatic setup change mechanism of the state of FIG.7 (b). (A)-(c) is a front view of the automatic stage change mechanism of this invention different from FIG. 7 in 2nd Example. (A), (b) is a front view of an automatic change mechanism of the present invention different from FIGS. 7 (a), 7 (b) in the second embodiment.

Explanation of symbols

1,20 Automatic changeover mechanism 2 Center pin 2a Setting position 3 Work 4 Heating coil 7a, 7b, 21a, 21b Rotating member 8a, 8b Shaft 9a First gear 9b Second gear 10 Drive motor 11 Third gear 14 Fourth gear

Claims (8)

  A workpiece changing device in a quenching apparatus, characterized in that a rotating member comprising a cam for mounting a workpiece is provided on a rotating shaft, and the workpiece is set at a predetermined height by rotating the rotating member. Automatic workpiece changeover mechanism.   2. The automatic workpiece changing mechanism according to claim 1, wherein a plurality of rotating members are arranged in a longitudinal direction of the workpiece, and the workpiece is supported by the plurality of rotating members.   3. The automatic workpiece according to claim 1, wherein two rotary shafts are provided, and each rotary shaft is provided with a rotary member, and the workpiece is supported by the rotary member provided on each rotary shaft. Changeover mechanism.   4. The automatic workpiece changing mechanism according to claim 3, wherein the rotary shafts are arranged symmetrically with respect to a perpendicular passing through the center of the workpiece, and the rotary shafts rotate in directions opposite to each other.   5. The automatic workpiece changing mechanism according to claim 1, wherein a stop position of the rotating member is associated in accordance with a vertical surface dimension of the workpiece orthogonal to the longitudinal direction.   6. A workpiece automatic according to claim 3, wherein a gear is provided on each rotating shaft of said rotating member, and power is transmitted to each gear by a motor having a driving gear. Changeover mechanism.   7. The diameter or radius of the cylindrical or columnar workpiece and the rotation angle of the rotating member are related so that the height of the center of the workpiece is constant. The automatic workpiece changing mechanism according to any one of the above.   A rotation unit corresponding to the diameter or radius of the workpiece input by the input unit, the storage unit storing a rotation angle of the rotating member corresponding to the workpiece diameter or radius, and an input unit for inputting the workpiece diameter or radius. 8. The automatic workpiece changing mechanism according to claim 7, wherein a rotation angle of the member is called from the storage unit.

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