JP2624403B2 - Honing head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honing head.

[0002]

2. Description of the Related Art As shown in Japanese Patent Publication No. 51-43636, for example, when honing a blind hole having no relief at the bottom, over-travel of the grindstone cannot be performed at the lower end of the blind hole. A honing head is used in which a fixed fulcrum is provided at each of the upper ends of a plurality of whetstone holders so that the tip of the whetstone spreads in a skirt. The position of each fixed fulcrum is moved by adjusting the position of an adjusting ring screwed on the outer periphery of the honing head body.

[0003]

However, when this honing head is used, the position of the adjusting ring must be adjusted each time the honing process is performed, which is troublesome and inconvenient.

The present invention has been made in view of such a point, and can easily cope with a change in the hole diameter without using a conventional adjusting ring, and when the grinding wheel is expanded, the tip of the grinding wheel holder expands at the bottom. It is an object of the present invention to provide a honing head that can be expanded to be as follows.

[0005]

According to the present invention, a honing head main body 13, an expansion cone 17 provided inside the honing head main body 13 so as to be movable in the axial direction, and an abutting surface of the expansion cone 17 are provided. Honing head body
In a honing head including a plurality of grinding wheel holders 32 fitted to 13 and radially expanded by the axial movement of the expansion cone 17, the expansion cone 17 is brought into contact with the tip side of the grinding wheel holder 32. A front-side inclined surface 24 and a rear-side inclined surface 25 abutting on the rear side of the grinding wheel holder 32 are provided in two stages, and the inclination angle of the front-side inclined surface 24 is larger than the inclination angle of the rear-side inclined surface 25. This is a large honing head.

[0006]

According to the present invention, only the extension cone 17 is advanced,
The rear side of each grinding wheel holder 32 is extruded in the expanding direction by the rear side inclined surface 25, and the distal side of each grinding stone holder 32 has a larger inclination angle than the rear side inclined surface 25. And the whetstone holder 32 is expanded to spread the skirt.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. A honing head body 13 formed in a cylindrical shape in an inverted L-shaped groove 12 provided at the tip of a spindle head 11 of a honing machine.
A pair of pins 14 protruding from the upper side surface are inserted from the lower end and engaged by rotating in the circumferential direction.

A cone shaft insertion plate 15 is integrally provided in the inner space of the honing head body 13, and the cone shaft insertion plate
An extended cone 17 is integrally provided below the cone shaft 16 that is slidably inserted into the shaft 15, and is provided between the cone shaft insertion plate 15 and the ring 18 fitted to the cone shaft 16 above the cone shaft 16. Compression coil spring 19 for urging cone shaft 16 upward
Is installed.

The expansion cone 17 has a front-side cone portion 21 and a rear-side cone portion 22 provided integrally via a connecting portion 23,
A front-side inclined surface 24 formed on the front-side cone portion 21 and a rear-side inclined surface 25 formed on the rear-side cone portion 22 are provided in two stages. In the two-step inclined surface, the inclination angle of the front-side inclined surface 24 is set to be larger than the inclination angle of the rear-side inclined surface 25.

At the lower part of the honing head body 13,
A plurality of grindstone holder insertion grooves 26 are provided in the axial direction, and a rib 27 for preventing the removal of the grindstone holder is provided inside each of the insertion grooves 26.

A plurality of grindstone holders 32 each having a grindstone 31 adhered to the outer surface are fitted into the respective grindstone holder fitting insertion grooves 26. Each of the whetstone holders 32 includes the tip-side cone portion.
A front-side convex portion 33 that is in contact with the front-side inclined surface 24 of the rear portion 21 and a rear-side convex portion 34 that is in contact with the rear-side inclined surface 25 of the rear cone portion 22.
Are formed. Then, the respective convex portions 33, 34 are formed on the inclined surfaces 24, 25 of the cone portions 21, 22 by retainer coil springs 35, 36 fitted in the spring fitting grooves at the front end portion and the rear portion of each grindstone holder 32. It is pressed and engaged.

Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.

FIG. 1 shows a state in which the grinding wheel is contracted. From this state, as shown in FIG. 2, the cone shaft 16 is pressed against the coil spring 19 by a member 41 advanced and retracted inside the spindle head 11. When the extension cone 17 is pressed down, the tip cone 21
The tip-side convex portion of each grinding wheel holder 32 by the tip-side inclined surface 24 of
33 is extruded in the expanding direction, and the rear convex portion 34 of each grinding wheel holder 32 is also extruded in the expanding direction by the rear inclined surface 25 of the rear cone portion 22.

At this time, since the front cone 24 has a larger inclination angle than the rear slope 25, the expansion cone 17 has the same degree of axial movement of the cone portions 21 and 22 even if the amount of movement in the axial direction is the same. The amount of expansion of the holder 32 in the radial direction is such that the front convex portion 33 is the rear convex portion.
As shown in FIG. 2, each grindstone 31 is expanded in a skirt spread, and a state in which the cutting pressure is strongly applied to the bottom of the blind hole H of the workpiece W is obtained. it can.

Next, in the case of a workpiece having a different blind hole diameter, for example, a workpiece having a larger blind hole diameter than the above-described blind hole H, the expanded cone 17 is only pushed down further than in the above case, and the same as in the above case. The rear slope of the rear cone 22
25, the rear convex portion 34 of each grinding wheel holder 32 is pushed out in the expanding direction according to the amount of enlargement of the blind hole diameter, and the rear inclined surface
The tip-side inclined surface 24 having a larger inclination angle than 25 causes the tip-side convex portion 33 of each of the grindstone holders 32 to be extruded more in the expansion direction, and in this case also, the bottom of the blind hole is expanded by the grindstone 31 expanded to the skirt. Can be cut with high accuracy.

Finally, FIG. 3 shows another embodiment of the present invention. In the case where an opening h penetrating from one end to the other end of the workpiece W is honed, A plurality of grindstone holder insertion grooves 26a may be formed so that the grindstone holder falling-off preventing portions 27a remain.
In this case, the rib 27 for preventing the grinding wheel holder from falling
Is not necessary, and the retainer coil spring 35
Needs to be changed as shown. Since other structures and operations of the embodiment shown in FIG. 3 are the same as those of the embodiment shown in FIGS. 1 and 2, the same reference numerals are given and the description is omitted.

[0018]

According to the present invention, the extension cone for expanding the grinding wheel holder in the radial direction, the tip side inclined surface abutting on the tip side of the grinding wheel holder, and the after-contacting abutment on the rear side of the grinding wheel holder. Since the side inclined surface is provided in two steps, and the inclination angle of the tip side inclined surface is set to be larger than the inclination angle of the rear side inclined surface,
By simply moving the expanding cone in the axial direction, it is possible to easily cope with a change in the hole diameter, and at the time of expanding the grindstone, the grindstone holder can be expanded so as to expand the skirt. Further, since a conventional adjusting ring is not required, the structure of the honing head can be simplified, the cost can be reduced because the honing head is easy to manufacture, and the economic effect is great.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a honing head according to an embodiment of the present invention, showing a grinding wheel contracted state.

FIG. 2 is a cross-sectional view illustrating a honing head of the above honing head in an expanded state of a grinding wheel.

FIG. 3 is a cross-sectional view showing a honing head of a honing head according to another embodiment of the present invention in an expanded state of a grindstone.

[Explanation of symbols]

 13 Honing head body 17 Expansion cone 24 Tip slope 25 Back slope 32 Grindstone holder

Claims (1)

(57) [Claims] 1. A honing head main body, an expansion cone provided movably in the axial direction inside the honing head main body, and an expansion cone fitted to the honing head main body so as to abut against an inclined surface of the expansion cone. A honing head comprising: a plurality of grinding wheel holders that are radially expanded by axial movement of the honing head; A honing head characterized in that a rear inclined surface which is in contact with the side is provided in two stages, and an inclination angle of the front inclined surface is set to be larger than an inclination angle of the rear inclined surface.