JPH01127616A - Apparatus for supporting work for high frequency quenching - Google Patents

Abstract

PURPOSE:To execute high frequency quenching for giving hardened layer of a work having uniform depth by holding both end parts of the work with a sleeve and holding mechanism and adjusting expansion/shrinkage of the work at the time of quenching treatment with sleeve driving mechanism. CONSTITUTION:One end of the crankshaft 10 to be work is held with the sleeve 30 and the other end is held with the holding mechanism 100 and the sleeve 30 is connected with the sleeve driving mechanism 40. This driving mechanism 40 is connected with fluid pressure source 59 and the air A through a four way changeable type solenoid valve 50, and the solenoid valve 50 is made to a 51 state in the figure and by connecting the work side cylinder space 44 with the air A and the reverse work side cylinder space 45 with the fluid pressure source 59, the crankshaft 10 is fixed with the sleeve 30 and the holding mechanism 100. Successively, the solenoid valve 50 is made to a 52 state in the figure and both spaces 44, 45 are connected with the air A, and the high frequency quenching is executed while rotating the crankshaft 10. By this method, the expansion of the crankshaft 10 caused by heating and the shrinkage of the crankshaft 10 caused by cooling are absorbed with the piston 42, respectively and the development of strain in the crankshaft 10 and fall-out of the crankshaft 10 are prevented and hardened layer having uniform depth is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a support device for a workpiece for induction hardening.

Conventional Summer Technique ■ For example, when performing induction hardening on a workpiece shaped like a crankshaft, the center of one longitudinal end of the workpiece is usually supported with a center pin, and a chuck, etc. that holds the other end is rotated. Induction hardening is performed while rotating the workpiece.

Trying to find something. ! However, when supporting the crankshaft as described above, the axial pushing force applied to the workpiece is 30 to 100.
kg, so a workpiece shaped like a crankshaft will be distorted. Furthermore, the elongation caused by heating the workpiece also increases the distortion of the workpiece. In addition, the shrinkage caused by cooling the workpiece causes misalignment of the centering of the workpiece. As a result, the high-frequency heating coil does not come into uniform contact with the surfaces of the parts of the workpiece to be hardened, such as crankshaft pins and journals, resulting in a problem in that a hardened layer of uniform depth cannot be obtained on the pins and journals.

The present invention was developed in consideration of the above points, and there is no pressing force applied to the workpiece, and even if the workpiece expands or contracts due to heating or cooling, the high-frequency heating coil can be applied to the part of the workpiece to be hardened. It is an object of the present invention to provide a work support device for induction hardening that can uniformly contact and change a hardened layer of uniform depth.

3. In the workpiece support device for induction hardening according to the present invention, a cylindrical part at one end of the workpiece is inserted to grip the cylindrical part so that the workpiece can freely slide in the axial direction, and the bottom part is held by the cylindrical part. A cylindrical sleeve, a holding mechanism at the other end of the workpiece, a sleeve drive mechanism connected to the bottom of the sleeve, and a four-way switching solenoid valve connected to the sleeve drive mechanism by piping. The sleeve drive mechanism includes a piston rod connected to the bottom of the sleeve, a piston fixed to the piston rod, and a cylinder housing the piston. The gist of the configuration is that the cylinder space and the cylinder space on the opposite work side can be switched and connected to a fluid pressure source and the atmosphere by means of electromagnetic valves, respectively.

Last month - Insert the cylindrical part at one end of the workpiece into the sleeve, hold the other end with the holding mechanism, and attach the workpiece to this device.Next, operate the solenoid valve to connect the cylinder space on the opposite side to the fluid pressure source. Also, connect the work side cylinder space to the atmosphere. Then, the sleeve is pushed and moved toward the workpiece, and with the workpiece being pushed toward the holding mechanism, one end of the workpiece is gripped by the sleeve, and the other end is held and fixed by the holding mechanism.

After that, operate the solenoid valve to switch the cylinder space on the non-work side from the fluid pressure source and connect it to the atmosphere.
No pushing force is generated on the workpiece by the holding mechanism or sleeve.

Furthermore, when the workpiece is heated, it stretches and displaces the sleeve toward the piston. When the workpiece is cooled, it will shrink, but since the length of the sleeve is set appropriately, the workpiece will not fall out of the sleeve.

When removing the workpiece from this device, operate the solenoid valve to switch the workpiece side cylinder space from the atmosphere to the fluid pressure source and connect it. Then, the sleeve is pushed and moved toward the side opposite to the workpiece. As a result, the cylindrical portion at one end of the workpiece is released from support by the sleeve, so that the workpiece can be removed from the apparatus.

FIG. 1 is a schematic diagram showing an embodiment of the present invention. FIG. 2 is a partial view of FIG. 1, showing a state in which the crankshaft is shrunk due to cooling.

The crankshaft 10, which is a workpiece, has pins 11, 12, .
13.14 and Journal 15.16.17.18.
It has 19. The cylindrical part 20 at one end of the crankshaft 10 (the right end in the figure) is inserted into an eight-cylindrical sleeve 30 having a bottom part 31 so as to be slidable in the axial direction of the workpiece. grips the cylindrical portion 20 with the inner surface 32 of the sleeve 30.

The other end (left end in the figure) of the crankshaft 10 is held by a chuck 101 driven by a chuck drive mechanism 102. The chuck 101 and the chuck drive mechanism 102 constitute a holding mechanism 100 for the other end of the crankshaft 10. Note that this holding mechanism 100
is supported by a support device (not shown), and this support device is rotated by a work rotation mechanism (not shown) that rotates the work together with the holding mechanism 100.

A sleeve drive mechanism 40 is connected to the bottom 31 of the sleeve 30. The sleeve drive mechanism 40 drives the sleeve 3
The piston rod 41 is connected to the bottom part 31 of the piston rod 41, a piston 42 is fixed to the piston rod 41, and a cylinder 43 houses the piston rod 41. The space inside the cylinder 43 is divided by the piston 42 into a work side cylinder space 44, which is a space on the work side of the piston 42, and an anti-work side cylinder space 45, which is a space on the opposite side of the piston 42.

A four-way switching type electromagnetic valve 50 to which fluid pressure is sent from a fluid pressure source 59 through a pipe 57 connects the pipes 55 and 56.
A piping 58 is provided which is connected to the work side cylinder space 44 and the non-work side cylinder space 45, respectively, and connected to the atmosphere A.

By operating the solenoid valve 50, the internal conduit of the solenoid valve 50 is switched, and the internal conduit is changed to 51.5 as shown in FIG.
There can be three states: 2 and 53. That is,
The work side cylinder space 44 and the counter-work side cylinder space 45 are connected to the atmosphere A and the fluid pressure source 59, respectively, in the state 51, are both connected to the atmosphere A in the state 52, and are connected to the atmosphere A, respectively, in the state 53. In the state, they are connected to the fluid pressure source 59 and the atmosphere A, respectively.

Next, the operation of this embodiment will be explained.

Cylindrical part 20 at one end of the crankshaft 10 which is a workpiece
is inserted into the inner surface 32 of the sleeve 30 so that the crankshaft IO can freely slide in the axial direction, and this cylindrical portion 20 is gripped by the inner surface 32 of the sleeve 30, and the other end is held in the chuck of the holding mechanism 100. Hold it at 101,
Attach the crankshaft 10 to this device.

Next, when the solenoid valve 50 is operated so that the internal pipe line of the solenoid valve 50 is set to 51 shown in FIG. A, respectively. Then, the sleeve 30 is pushed and moved toward the crankshaft 10, and with the crankshaft 1° being pushed toward the holding mechanism 100, one end of the crankshaft IO is held by the sleeve 30, and the other end is held by the sleeve 30. Holding mechanism 100
are held and each is fixed.

After that, when the solenoid valve 50 is operated so that the internal pipe line of the solenoid valve 50 is set to 52 in FIG. 1, the work side cylinder space 44 is connected to the atmosphere A as before.
The cylinder space 45 on the opposite work side is connected to the atmosphere A by switching from a fluid pressure source 59.

That is, since the piston 42 to which the sleeve 30 is connected can freely move in the axial direction of the work inside the cylinder 43 without receiving fluid pressure on either the work side or the opposite side, the crank by the holding mechanism 100 and the sleeve 30 can be moved freely. No pushing force is generated on the shaft IO.

Further, when the crankshaft 10 is heated in this state, the crankshaft 10 expands and displaces the sleeve 30 toward the piston 42, so that no distortion occurs in the crankshaft 10. When the crankshaft 10 is cooled, the crankshaft IO contracts, and a gap 32 having a length d is created between the cylindrical portion 20 at one end of the crankshaft 10 and the sleeve 30, as shown in FIG. . However, by appropriately selecting the length of the sleeve 30, even if the crankshaft 10 is shrunk, the crankshaft 10 will not fall out of the sleeve 30, and the sleeve 30 and the holding mechanism 100 will remain together as before cooling. Since the centering can be supported by , no centering error occurs due to cooling.

When removing the crank shirt (crank shirt) 10 from this device,
When the solenoid valve 50 is operated so that the internal pipe line of the solenoid valve 50 is set to 53 in FIG. It is switched from the atmosphere A and connected to a fluid pressure source 59. Then, the sleeve 30 is pushed and displaced toward the side opposite to the workpiece, and the cylindrical portion 20 at one end of the crankshaft 10 is released from support by the sleeve 30.
The crankshaft 10 can be removed from the device.

In this embodiment, the holding mechanism 100 at the other end of the crank shirt eye 0 includes a chuck 101 and a chuck driving mechanism 10.
2, but it is not limited to this, as long as it can hold the other end of the crankshaft 10 and can be rotated by the work rotation mechanism (not shown).

As explained above, according to the work supporting device for induction hardening of the present invention, one end of the work is supported by the sleeve so that the work can slide freely in the axial direction. Therefore, no strain is generated due to the pressing force, and even if the workpiece is elongated due to heating, the strain of the workpiece does not increase. Furthermore, the centering of the workpiece will not be distorted due to shrinkage due to cooling of the workpiece.

Therefore, the high-frequency heating coil uniformly contacts the surfaces of the parts of the workpiece to be hardened, such as crankshaft pins and journals, and has the advantage that a hardened layer of uniform depth can be obtained on these parts.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention. FIG. 2 is a partial view of FIG. 1, showing a state in which the crankshaft is shrunk due to cooling. 10... Crankshaft, 20... Cylindrical part, 30
... Sleeve, 31... Bottom, 40... Sleeve drive mechanism, 41... Piston rod, 42 Piston,
43... Cylinder, 44... Work side cylinder space, 45... Non-work side cylinder space, 50...
... Solenoid valve, 55.56.57.58 ... Piping, 59
... Fluid pressure source, 100 ... Holding mechanism. Figure 2

Claims (1)

[Claims] (1) A cylindrical sleeve at one end of the workpiece is inserted into and grips the cylindrical part so that the workpiece can freely slide in its axial direction, and a cylindrical sleeve having a bottom and a holding mechanism at the other end of the workpiece. A work support device for induction hardening, comprising: a sleeve drive mechanism connected to the bottom of the sleeve; and a four-way switching type solenoid valve connected to the sleeve drive mechanism via piping, the sleeve drive mechanism comprising: , comprising a piston rod connected to the bottom of the sleeve, a piston fixed to the piston rod, and a cylinder housing the piston, and a work-side cylinder space and a non-work-side cylinder space of the cylinder, A work support device for induction hardening, characterized in that it can be connected to a fluid pressure source and to the atmosphere by switching between the electromagnetic valves.