JPS5943273B2 - whetstone head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grindstone head, and more particularly to a grindstone head for internal grinding that grinds or polishes the inner peripheral wall of a cylinder, ring gauge, etc.

Conventionally, when performing internal grinding using a grinding wheel head, the first
As shown in the figure, the workpiece 1 is rotated by the rotary chuck 2 and the grindstone head 3 having a circumferential surface is brought into contact with the rotating chuck 2, or the workpiece 1 is fixed as shown in FIG. Generally, the grindstone head 3 is rotated, and the rotating shaft of the grindstone head 30 is brought into contact with the workpiece 1 while rotating along the inner surface thereof.

However, in such conventional examples, the drive mechanism is complicated, and furthermore, it is difficult to adjust the grinding, and neither the grinding speed nor the grinding accuracy is satisfactory.

An object of the present invention is to provide a grindstone head that can perform grinding with high grinding speed and high precision, especially high roundness.

The present invention allows a grindstone to be held by a grindstone holding member, and this grindstone holding member is arranged so as to be movable in the radial direction of a main shaft along a radial guide provided on a support member, and the grindstone holding member in the radial guide The above object is achieved by engaging the adjustment member with an adjustment guide of the adjustment member and adjusting the amount of radial protrusion of the grindstone by the relative rotation amount between the support member and the adjustment member.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 3 and 4, a cylindrical rod-shaped main shaft 1
At the lower end of 1, there is a disc-shaped 7 flange 12 of a predetermined size.
is formed, and a threaded portion 13 is carved approximately at the center of the main shaft 11.

The flange 12 and the support member 12 are connected to each other by three screws 16 that are fitted into the circular groove 15 of the support member 14 and are spaced apart from each other by 120 degrees on an imaginary circumference centered on the main shaft 11. 14 is fixed (5th
(see figure).

The support member 14 is formed into a substantially short cylindrical shape, and a center hole 17 is bored in the center of the support member 14 so that the main shaft 11 can be inserted therethrough.

Further, as shown in FIG. 6, the support member 14 includes:
Three guide grooves 18 are formed as radial guides,
These guide grooves 18 are arranged at intermediate positions of the screws 16, and are spaced 12 times apart on a virtual circumference centered on the main shaft 11.
They have an interval of 0 degrees and are each provided toward the radial direction of the main shaft 11.

A grindstone holding member 20 formed in a substantially rectangular parallelepiped shape is slidably fitted into the guide groove 18 .
A grindstone 19 is embedded in each of the ends of the outer peripheral side of the support member 14, and the grindstone 19 is configured to move forward and backward along the radial direction of the support member 14.

A pin 21 is implanted in the whetstone holding member 20, and the upper end of the pin 21 protrudes from the upper end surface of the whetstone holding member 20.

The position in the radial direction of the pin 21 implanted in the grindstone holding member 20 is such that when the pin 21 is inserted into the adjustment guide carved in the adjustment member 22, the amount of protrusion in the radial direction of the three grindstone holding members 20 is The positions are assumed to be equal to each other.

The adjustment member 22, as shown in FIGS. 7 and 8,
The adjustment member 22 is formed into a substantially short columnar shape, and has an insertion hole 23 bored in the center thereof so that the main shaft 11 can be inserted therethrough.

Further, a fastener 24 (a first
A fitting groove 25 is provided so that the lower end (see figure) is fitted, and when the fastener 24 is tightened, the adjusting member 22, the grindstone holding member 20, and the supporting member 14 are configured to be able to rotate integrally with the main shaft 11. ing.

A spiral groove 26 formed in an Archimedean spiral as an adjustment guide is provided on the lower end surface of the adjustment member 22, and the pin 21 of the grindstone holding member 20 slides in this spiral groove 26 along the shape of the groove. Each is inserted freely.

Furthermore, Archimedes' spiral is r=aθ(a
is a curve wound around the origin given by the equation of (is a constant).

An insertion hole is provided in the center of the fastener 24 whose lower end is inserted into the insertion groove 25 of the adjustment member 22 so that the main shaft 11 can be inserted therethrough, and a female thread 27 is cut into this insertion hole. This female thread 27 is screwed into the threaded portion 13 of the main shaft 11, and by screwing in the fastener 24, the adjustment member 22 is fixed between the fastener 24 and the support member 14.

Note that a scale 28 is provided on the outer circumferential surface of the adjusting member 22 along the circumferential direction, and a pointer 29 is engraved at a predetermined position on the outer circumferential surface of the supporting member 14. The display is configured to display the amount of movement in the direction, that is, the amount of protrusion of the grindstone 19 in the radial direction.

Next, the operation of this embodiment will be explained.

The upper end of the main shaft 11 is connected to a drive source that is not used for drawing, and the grinding wheel 1
9 is inserted into the inner diameter of the workpiece.

Subsequently, when the adjusting member 22 is rotated along the rotation direction of the main shaft 110 with the fastener 24 loosened, the distance from the main shaft of the pinot 21 fitted in the spiral groove 26 is adjusted to the position of the adjusting member 22.
It changes depending on the amount of 0 rotation.

Therefore, the grindstone holding members 20 slidably fitted into the guide grooves 18 each protrude by a predetermined amount toward the force along the guide grooves 18.

At this time, the spiral groove 26 is formed in an Archimedean spiral shape, and the three grinding wheels 1 correspond to the amount of rotation of the adjusting member 220.
The respective amounts of advance and retreat in the radial direction of 9 are equal to each other.

After accurately setting the amount of radial movement of the grindstone 19 to a desired value using the scale 28 of the adjustment member 22 and the finger slope 29 of the support member 140, the fastener 24 is tightened to fix the grindstone 19.

In this state, the main shaft 11 is rotated to grind the workpiece.

Further, if necessary, for example, when the grinding wheel is worn out as the grinding progresses, grinding is continued while increasing the amount of protrusion of the grinding wheel 19 as appropriate.

According to this embodiment, the following effects can be obtained.

Three grindstones 19 are arranged on the same virtual circumference centered on the main shaft 11 at equal intervals (120 degrees), and these grindstones 19 are configured to grind the workpiece at the same time. Compared to the conventional example described above, this has the effect of increasing the grinding speed.

Furthermore, since three points are simultaneously ground, the grinding accuracy, especially the roundness, is improved.

Furthermore, the protrusion amounts in the radial direction of each of the three grindstones 19 are always equal, and the adjustment of these protrusion amounts can be easily and appropriately performed at the same time by simply rotating the adjustment member 22.
This has the effect that no misalignment occurs even if the amount of protrusion is adjusted over shallow concave areas.

In addition, after inserting the grindstone part into the inner diameter of the workpiece, the grindstone part is enlarged and brought into contact with the inner diameter of the workpiece, and if the workpiece is fixed in this state, the workpiece can be automatically centered. This has the effect that the process can be easily and appropriately carried out.

Moreover, compared to conventional methods, where the grinding wheel head had to be changed depending on the shape of the workpiece and the progress of grinding,
Since it is often possible to adjust the amount of protrusion of the grindstone 19 without changing the grindstone head, the need for changing the grindstone head is drastically reduced and work efficiency is significantly improved.

Furthermore, since a scale 28 and a pointer 29 are provided, adjustment is extremely convenient.

Furthermore, according to this embodiment, grinding work can be performed without the need for any special equipment by simply connecting the main shaft 11 to various machines that can serve as a rotational drive source, such as an off-the-shelf drilling machine.
It has the advantage of being extremely easy and widely applicable.

Furthermore, according to this embodiment, since multi-point simultaneous grinding is performed, 100% load grinding can be performed.

In the above embodiment, three grindstones 19 are arranged at 120 degrees apart from each other around the main shaft 11, but the number is not limited to three, and there may be more than three, or at least three. good.

Further, the grindstones 19 do not necessarily have to be arranged at equal intervals, but if they are arranged at equal intervals, there is an effect that the grinding accuracy, particularly the roundness, is further improved.

Furthermore, although the adjustment guide of the adjustment member 22 has been described as being the spiral groove 26 formed in an Archimedean spiral shape,
The shape of the adjustment guide is not limited to this, but for example, arc-shaped grooves of the same shape are provided at three locations in a radial direction, shifted by 120 degrees from each other around the main shaft 11, like fan blades, and a pin is inserted into each of these grooves. 21 may be fitted.

In addition, although the scale 28 is provided on the adjustment member 22 and the - direction pointer 29 is provided on the support member 14, the scale 28 is provided on the support member 14, and the pointer 29 is provided on the adjustment member 22.
2, or may have no scale 28 or pointer 29 at all.

However, if the scale 28 and the pointer 29 are provided, it is extremely convenient when adjusting the amount of advance and retreat of the grindstone 19 in the radial direction.

Further, the support member 14 and the main shaft 11 are fixed by the flange 1.
2 and the screw 16, for example, the adjustment member 22
may be fixed to the main shaft, and the support member 14 may be rotatably fixed to the main shaft 11 with a fastener 24.

As described above, according to the present invention, it is possible to provide a grindstone head that has fast grinding speed, high grinding accuracy, and can be applied to a wide range of machines such as ready-made ball plates.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views showing how a conventional grinding wheel head is used, FIG. 3 is a sectional view showing the overall configuration of an embodiment of the grinding wheel head according to the present invention, and FIG. 4 is a sectional view showing the embodiment of the grinding wheel head according to the present invention. , FIG. 5 and FIG. 6 are exploded perspective views showing the shape of the main parts of the embodiment from different angles, and FIG. 7 is a sectional view including the center line of the adjustment member used in the embodiment,
FIG. 8 is a bottom view of the adjustment member. 11...Main shaft, 14...Support member, 1
9... Grindstone, 20... Grindstone holding member,
22... Adjustment member, 24... Fastener,
26...Spiral groove, 28...Scale, 29
...Guidelines.

Claims (1)

[Scope of Claims] 1. A main shaft, a holding member that holds a grindstone, a support member formed with a radial guide for guiding the grindstone holding member in the radial direction of the main shaft, and a support member that is slidable within the radial guide. an adjustment guide that engages with a grindstone holding member supported by the grindstone holding member and moves the grindstone holding member along a radial guide by relative rotation with the support member as a center of rotation along the axis of the main shaft; A grindstone head comprising: a fastener for integrating the adjustment member and the adjustment member so that they can rotate together with the main shaft. 2. In claim 1, the grindstone is:
A grindstone head characterized in that a plurality of grindstone heads are arranged on an imaginary circumference of the same diameter centering on a main shaft and at equal intervals along the rotational direction of the main shaft. 3. The grindstone head according to claim 1 or 2, wherein the adjustment guide is formed in an Archimedean spiral shape. 4. The grindstone head according to any one of claims 1 to 3, wherein the grindstone head is provided with a scale indicating the amount of protrusion of the grindstone.