JPS5866669A - Separation type grindstone wheel for high speed rotation - Google Patents

Abstract

PURPOSE:To make it possible to eliminate the deflection of a grindstone in high speed rotation by realizing a stuck and fixed state between a flange and the grindstone by rather actively utilizing centrifugal force that can not be avoided in high speed grinding. CONSTITUTION:For a flange 12 constituting a separation type grindstone wheel 13 for high speed rotation together with a disk shaped grindstone 10, the tapered hole 12b of a shaft core part is engaged with the shaft tip tapered part 11a of a spindle 11, and fitted and connected to the spindle 11 by a tightening nut 14. When the grindstone 10 is largely distended than the flange 12 by centrifugal force due to high speed grinding processing because a convex part 18 of the grindstone 10 is fitted to a concave part 17 by taking the standard of attaching the grindstone 10 to the flange 12 as an outer diameter, the convex part 17 is stuck to the concave part 18, and it is possible to eliminate the deflection of the grindstone 10. Accordingly, the bad influence of large centrifugal force unavoidable in high speed grinding can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-speed rotation separable grindstone wheel comprising a flange coupled to a spindle and a grindstone assembled and integrated with the flange.

As a result of recent technical improvements regarding grinding power Roe, high-speed grinding is achieved by high-speed rotation of a spindle equipped with a grinding wheel, and the abrasive grains of the grinding wheel are improved. Improved superabrasives became popular.

However, it is difficult to increase the speed of high-speed grinding due to the strength of the grinding wheel, and super-abrasive grains are extremely expensive, so the abrasive grains are difficult to fall off. A future challenge is to research processing methods that place less stress on the binder and abrasive grains. Furthermore, in high-speed grinding, the centrifugal force increases in proportion to the square of the rotational speed, so the grinding wheel expands to a non-negligible extent, and this uneven expansion has a negative impact on accuracy and the life of the grinding wheel. give. In addition, a phenomenon occurred in which the shaping amount of the grindstone was larger than the planned value, and expensive abrasive grains were wasted. For these reasons, it has become difficult to further increase the speed of high-speed grinding and apply it to actual machining operations.

In view of the above points, a disc-shaped grinding wheel with superabrasive particles attached and fixed to the outer circumferential surface has been developed, which increases the strength and can therefore suppress distortion in the outer diameter direction to a minute level even when the rotational speed is extremely high. it was thought. However, according to this, is there a single taper hole required to fit and connect the grinding wheel to the spindle? It is difficult to ensure the accuracy of the taper hole because it is necessary to form it on the core of the whetstone, and the whetstone is integrally molded with the hub of the shaft core where the taper hole is formed. Therefore, problems such as heavy weight and poor handling such as installation work on the spindle occurred.

Therefore, as shown in FIG. 4, the flange 42 connected to the grinding wheel 40r spindle 41 is made separately,
A high-speed rotation separable grindstone wheel 43 was devised, which is constructed by assembling and integrating the flange 42 with the flange 42. Specifically, the separate grinding wheel 43 is connected to the spindle 4
A disc-shaped grindstone 40 is fitted onto the outer periphery of the stepped portion 428 of the flange 42 which is connected to the shaft tip taper V4541a of No. It is constructed by assembling and integrating the parts with bolts 46.

According to this configuration, the tapered hole 42b of the flange 42
The grindstone 40 can achieve high accuracy and is suitable for high-speed rotation, and the weight of the grindstone 40 itself can be reduced, making it easy to handle, thus solving the two problems.

However, on the other hand, the reference for assembling the grinding wheel 40 to the flange 42 is the inner diameter reference on the inner peripheral surface 40a of the grinding wheel 40, and the grinding wheel 40 expands more than the flange 42 due to the centrifugal force caused by the high speed rotation of the spindle 41. In addition, a new problem occurred in that a gap was created between the flange 42 and the inner circumferential surface 40a of the grindstone during high-speed grinding, which caused the grindstone 40 to run out.

The present invention is a ``separable wheel for high-speed rotation that can exhibit the advantages of dual wheels''. This was done to further improve the system and solve the following problems.

An object of the invention is to provide a flange coupled to a spindle;
In a high-speed rotation separable wheel comprising a grindstone fitted to the outer periphery of the flange and assembled to the side surface of the radially extending portion of the flange, In addition to forming four concave parts on the side surface in the axial direction of the spindle, a convex part corresponding to the concave part is formed on the whetstone, and the standard for assembling the whetstone to the flange is different from that of conventional separate type whetstone wheels. The convex part is fitted into the concave part as a reverse outer diameter reference, so that when the whetstone expands due to centrifugal force during high-speed grinding, the outer peripheral surface of the convex part of the whetstone is brought into close contact with the four parts due to the difference in the amount of expansion. By actively utilizing the centrifugal force that cannot be avoided in high-speed grinding, we have achieved a state in which the flange and grinding wheel are tightly fixed, thereby eliminating the possibility of the grinding wheel being photographed during high-speed rotation. Separate grindstone wheel for high speed rotation? It's there to provide.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, a separate grindstone wheel 13 for high-speed rotation is shown together with a disk-shaped grindstone 10. The constituting flange 12 is fitted into a tapered hole 12b' in the shaft core and a tapered part 11a at the shaft end of the spindle 11, and is fitted into the spindle 11 with a tightening nut 14, similar to the separate grindstone wheel 43 shown in FIG. be combined. The grindstone 10 is fitted onto the outer periphery of the stepped portion 12a of the flange 12, and is assembled and integrated with the side surface 15a of the outer radially extending portion 15 of the flange 12 using bolts 16.

A spindle 11 is provided on the side surface 15a of the outer radially extending portion 15.
A recess 17 recessed in the axial direction is formed in an annular shape over the entire circumference of the flange 12, and on the other hand, an inner diameter portion of the side surface of the grindstone 10 corresponding to the position of the recess 17 has a protruding direction extending in the axial direction of the spindle 11. A convex portion 18 is formed in an annular shape over the entire circumference of the grindstone 10. The concave portion 17 and the convex portion 18 correspond in shape,
In the embodiment shown in FIG.
It has a straight shape parallel to 1. The diameter of the inner circumferential surface 10a of the grinding wheel 10 does not need to be set strictly to a value that matches the diameter of the step 12a of the flange 12;
A rough diameter size that allows the grinding wheel 10v to fit loosely on the outer circumferential surface of a is sufficient. On the other hand, the diameter of the outer peripheral surface of the convex portion 18 of the grindstone 10 is set to match the diameter of the concave portion 17 of the flange 12.

To describe this specifically, what is part A of Figure 1? As shown in the enlarged view of FIG. 2, the outer diameter of the outer circumferential surface 18a of the convex g1518 is set to a value obtained by subtracting twice the clearance S from the inner diameter of the concave portion 17a facing the outer circumferential surface 18a, The clearance S is determined by comparing the grinding wheel 10 with the flange 12 when the spindle 11 is rotated at a high speed at a predetermined rotation speed.
is determined according to the amount expanded by centrifugal force. From the above, the reference for assembling the grinding wheel 10 to the flange 12 is the outer diameter reference at the outer circumferential surface 18a of the convex portion 18, and when viewed from the flange 12 side, the reference for assembling the flange 12 to the grinding wheel 10 is the surface of the recess 17. This serves as the inner diameter reference for 17a.

Therefore, the grinding wheel 10 fits into the outer periphery of the flange 12 and the recess 1
7 with a clearance Si for the convex part 18 and a spigot fit, and after assembling and integrating the grinding wheel 10v on the side surface 15a of the outer diameter direction extension part 15 of the flange 12, when the spindle 11 is rotated at high speed, the grinding wheel is released by centrifugal force. Due to the expansion and deformation of 10, the clearance S disappears and the outer circumferential surface 18a of the convex portion 18 comes into close contact with the surface 17a of the concave portion 17, thereby radially positioning the grinding wheel 10 with respect to the flange 12, and the grinding wheel 10 during high-speed grinding. Runout is prevented.

In another embodiment according to the present invention shown in FIG. Both of the convex portions 28 are formed as tapers that widen forward in the direction of the shaft end of the spindle 21 . According to this, when the grinding wheel 20 is fitted to the flange 22 from the right side to the left side in the figure, the concave part 27 and the convex part 28 form a tapered fit that exerts a guiding action, so the fitting process is difficult. It becomes easy to do. In this embodiment as well, the grindstone 2 is attached to the flange 22.
The assembly reference number 0 is the outer diameter reference on the inclined outer peripheral surface of the convex part 28, but when the concave part 27 and the convex part 28 are tapered fitted, it is not necessarily necessary to provide the clearance S between them. The outer peripheral surface of the convex portion 28? Concave F facing the outer peripheral surface of the nucleus! Even if the grinding wheel 20 is brought into contact with the surface of A27 in advance, since both surfaces are in close contact during high-speed grinding, the grinding wheel 20
Shake? It can be prevented.

As is clear from the following explanation, according to the present invention, a concave gls
'r, the grindstone has protrusions that correspond to the recesses, and unlike conventional separate grindstone wheels, is there a standard for assembling the grindstone to the flange? Since the convex g15'2 is fitted into the concave part as the outer diameter reference, when the grinding wheel expands more than the flange due to centrifugal force during high-speed grinding, the concave part and the convex part come into close contact and the grinding wheel can be prevented from shaking. By using the centrifugal force, it becomes possible to prevent the negative effects of the large centrifugal force that cannot be avoided in high-speed grinding.

[Brief explanation of the drawings] Figure 1 is a side sectional view, Figure 2 is an enlarged view of section A in Figure 1, and Figure 3 is an enlarged view of section A in Figure 1.
The figure is a side sectional view showing another embodiment, and FIG. 4 is a side sectional view showing a conventional example. In the drawing, 10.20 is a grindstone, 11.21 is a spindle, 12.22 is a flange, 15.25 is an outer radially extending portion, 17.27 is a recessed portion, and 18.28 is a convex portion. Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] In a high-speed rotation separable grindstone wheel comprising a flange coupled to a spindle, and a grindstone fitted to the outer periphery of the flange and assembled and integrated with the side surface of the flange's outer radial extension, A concave portion recessed in the axial direction of the spindle is formed on the side surface of the outer radially extending portion, and a convex portion corresponding to the concave portion is formed on the grinding wheel, and the assembling reference of the grinding wheel to the flange is set as the outer diameter reference. A separable wheel for high-speed rotation characterized by a convex part fitted into a concave part.