JPS6232762Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a honing device that inserts a honing tool into a machining hole of a workpiece and hones the inner peripheral surface of the machining hole.

BACKGROUND ART A honing tool is known in which a grindstone provided at the tip of a tool body of the honing tool is expanded in the radial direction, and honing is performed while the grindstone is pressed against the inner peripheral surface of a processing hole of a workpiece. As shown in Figs. 1 and 2, grindstones d... having grindstones c... are arranged at equal intervals on the tip b of the tool body a, and these grindstones d... The tapered part e on the inner surface is joined to the tapered surface g of the slide rod f, and the slide rod f is slid by hydraulic pressure or air pressure to release the whetstone d.
The grindstone c... is expanded in the radial direction through...

Therefore, by inserting the tip b of the tool body a into the machining hole of the workpiece and then expanding the grindstone c..., honing can be carried out while pressing the whetstone c against the inner surface of the machining hole, that is, the surface to be machined. Can be processed.

However, since the slide rod f has considerable backlash in the radial direction, the grindstone c and the grindstone shoe d are in a nearly free state outward. Therefore, as shown in FIG. 3, if a groove j exists in the hole i of the workpiece h, the grinding wheel c
falls, and as a result, a sag occurs in the groove j, and conversely, an inward protrusion occurs on the opposite side of the groove j. Furthermore, even if there is a misalignment between the center of the machined hole i of the workpiece h and the center of the tool body a before machining, this cannot be detected, so the roundness accuracy of the machined hole i is low and the reference surface There is also the disadvantage that the perpendicularity with the angle cannot be obtained accurately.

This idea was developed in light of the above circumstances, and its purpose is to prevent the grinding wheel from falling even if there is a groove in the hole to be machined, and to prevent the honing tool from elastically bending. It is an object of the present invention to provide a honing device that can prevent such problems and improve roundness and perpendicularity with a reference surface.

This invention will be explained below based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 4 denotes a support stand erected on the base 2, and the support stand 1 is provided with a through hole 3 passing through it in the vertical direction. A horizontal reference surface 4 is provided at the edge of the through hole 3 on the upper end surface of the support base 1, and a workpiece 5 is placed on this reference surface 4. Further, a clamp mechanism 6 is provided on the outer periphery of the reference surface 4 to clamp the workpiece 5 between the reference surface 4 and the clamp mechanism 6 . A honing tool 7, which will be described later, is inserted into the machining hole 5a of the workpiece 5 from above, and its tip 8 is recessed into the through hole 3 of the support base i. A cylindrical slide block 9 having through holes 9a is inserted into the through hole 3 so as to be movable up and down.
This upper end is in contact with the tip 8 of the honing tool 7 via a sphere 10 provided at the center. Furthermore, a telescopic bellows 11a is provided on the outer peripheral edge of the upper end of the slide block 9 so as to surround the tip 8 of the honing tool 7, and a bellows 11a that can be freely expanded and contracted is provided on the lower end of the slide block 9 to constantly urge the slide block 9 upward. A spring 11 is provided in this manner. Therefore, the slide block 9 is the honing tool 7.
The honing tool 7 is rotatably supported and moved up and down within the through hole 3 in conjunction with the up and down movement of the honing tool 7.

Next, the honing tool 7 will be explained. It is constructed as shown in FIGS. 5 to 7. 12 is a tool body of the honing tool 7, which is formed into a cylindrical shape. This tool body 12
A slide hole 13 is bored at the tip of the slide hole 13, and slits 14 are formed at equal intervals in the radial direction of the slide hole 13. A slider 15, which is slidable in the axial direction, is inserted into the slide hole 13, and is in contact with a rod 16 inserted into the tool body 12.
Furthermore, a tapered surface 17 is provided on the tip side of the slider 15.
... are formed, and these tapered surfaces 17 ... are provided with guide grooves 18 made of dovetail grooves. Each of these guide grooves 18... is the slit 14.
..., and a grindstone head 19 ... is provided in the slit 14 ... so as to be freely protrusive and retractable in the radial direction. Inclined surfaces 20 corresponding to the tapered surfaces 17 of the slider 15 are formed inside these grindstone heads 19, and these inclined surfaces 20 are provided with the guide grooves 18.
A slidable engaging protrusion 21 is provided on the holder. Further, a whetstone 22 is fixed to the outside of the whetstone head 19. Furthermore, a threaded portion 23 is provided at the tip of the tool body 12, and a cap 24 is screwed onto this threaded portion 23. A coil spring 26 is interposed between the inner surface of the cap 24 and a spacer 25 provided at the tip of the slider 15, and constantly biases the slider 15 in the backward direction.

Next, the operation of the honing device configured as described above will be explained. First, the workpiece 5 is placed on the reference surface 4 of the support base 1, and then the honing tool 7 is inserted into the machining hole 5a of the workpiece 5. Then, the tip 8 of this honing tool 7 is brought into contact with the sphere 10 of the slide block 9. At this time,
Since the workpiece 5 is movable on the reference surface 4, its position is regulated by the honing tool 7. After positioning the workpiece 5 at a predetermined position in this manner, the workpiece 5 is held fixedly when it is pressed against the reference surface 4 by the clamp mechanism 6. In this state, when the rod 16 of the honing tool 7 is moved forward, the slider 15 moves forward against the restoring force of the coil spring 26. Therefore, slider 15
The grindstone heads 19 . . . that engage with the guide grooves 18 . . . move in the radial direction while sliding along the tapered surface 17, and the grindstones 22 . Therefore, when the honing tool 7 is rotated while reciprocating, the machining hole 5a is formed by the grinding wheel 22.
It is honed by... At this time,
In conjunction with the reciprocating movement of the honing tool 7, the slider block 9 reciprocates within the through hole 3 and guides the honing tool 7, which prevents the honing tool 7 from bending and improves the perpendicularity of the machined hole 5a to the reference plane 4. Even if there are grooves, slits, etc. in the machined hole 5a, the grindstone 22 is engaged with the slider 15 via the grindstone head 19, so it will not fall into the grooves, slits, etc. , it is possible to prevent droop and improve roundness.

Further, chips generated by the honing process pass through the bellows 10a and are discharged from the through holes 9a of the slide block 9.

Note that in the above embodiment, the slider 15
The grindstone head 19 is inserted into the guide groove 18 provided on the tapered surface 17 of the
However, this invention is not limited to the above-mentioned embodiment, and as shown in FIG. A plurality of links 28 .
8... The grindstone head 30 may be moved in the radial direction.

As explained above, this idea is based on a slide block that is installed on a support base with a clamp mechanism that fixes the workpiece to a reference surface, and this slide block is used to reciprocate the honing tool inserted into the machining hole of the workpiece. Since the honing tool is interlocked with and rotatably supported, the honing tool can be prevented from bending, and the perpendicularity of the machined hole to the reference plane can be accurately obtained. Moreover, since the whetstone of the honing tool is linked with the slider through the whetstone head and protrudes and sinks in the radial direction, even if there are grooves or slits in the machined hole, the whetstone will not fall into these.
This has the effect of preventing droop and improving roundness.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional honing tool, Fig. 2 is a sectional view taken along the line of Fig. 1, and Fig. 3 is a sectional view taken along the line shown in Fig.
The figure is a sectional view showing a conventional processing state, and Figures 4 to 7 show an embodiment of this invention.
The figure is a longitudinal sectional front view of the honing device, and Figure 5 is the 4th
Figure - Sectional view along the line, Figure 6 is Figure 5 -
7 is an exploded perspective view of the honing tool, and FIG. 8 is a sectional view of the honing tool showing another embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Support stand, 4... Reference surface, 5... Workpiece, 5a... Machining hole, 6... Clamp mechanism, 7...
... Honing tool, 9 ... Slide block, 1
2...Tool body, 19...Whetstone stand, 22...Whetstone.

Claims (1)

[Scope of utility model registration request] In a honing device that performs honing while pressing a grindstone of a honing tool into a machining hole of a workpiece, there is provided a support base equipped with a clamp mechanism for fixing the workpiece to a reference surface, and a support base equipped with a clamp mechanism for fixing the workpiece to a reference surface. A slide block that comes into contact with the tip of a honing tool inserted into a machining hole of an object, moves in conjunction with the linear reciprocating motion of the honing tool, and rotatably supports the honing tool; The tool is equipped with a slider that can freely slide, and a grindstone head that is provided to be freely movable in the radial direction in conjunction with the slider and that causes a plurality of equally spaced grindstones to protrude and retract from the outer peripheral surface of the tool body by the same amount at all times. A honing device characterized by: