JPS6328569A - Grinding method and grinding wheel used for it - Google Patents

Abstract

PURPOSE:To increase the life of a grinding wheel even in the case of traverse grinding equally to or more than in the case of plunge cutting by using a grinding wheel in which a bond-like ring of grinding face is inclined to a rotary shaft, whereas, a pressure contacting face with a workpiece is in parallel to said rotary shaft. CONSTITUTION:A grinding wheel is provided on a cylindrical base metal 9 in a bond form being inclined with respect to its rotary shaft A, while a grinding face 10 is formed so as to be in parallel to the pressure contacting face 12 with a workpiece 11. And when the workpiece 11 is subjected to a traverse grinding, a cutting point is moved successively on one side edge 10a of the grinding face 10 from a point P. Since the grinding face 10 is inclined, the point P is moved on the side face of the grinding wheel as shown by the broken line B due to the rotation of the grinding wheel. Accordingly, the grinding face 10 is intermittently brought into pressure contact with the workpiece 11, intermittently carrying out grinding and, thereby, the life of the grinding wheel can be increased. And, further, since the cutting point is not fixed to the two places on both ends of the grinding wheel, sharp cutting can be carried out at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grinding method in which a grinding wheel and an object to be ground are intermittently brought into pressure contact, and a grinding wheel used therein.

[Conventional technology]

Generally, there are two types of methods for performing cylindrical outer circumferential grinding and inner surface grinding using the circumferential surface of a rotatably supported grindstone: traverse grinding and plunge grinding.

As shown in Fig. 6, in traverse grinding, the peripheral surface of the workpiece 1 is ground over an area wider than the width of the grindstone by applying a feed motion to the workpiece 1 or the grindstone 2 to move the grinding point. It's Uruchino.

In contrast, plunge grinding is shown in FIG. 7(a).

As shown in (b), no feeding motion is applied to the object to be ground 1 or the grindstone 2, and grinding is performed only by the cutting of the grindstone, and the peripheral surface of the object to be ground 1 is ground according to the shape of the grinding surface of the grindstone. be done.

For this type of grinding, especially precision grinding, diamond grinding wheels or C
BN whetstones (so-called borazon whetstones) are often used.

Such a grindstone usually has a structure in which the abrasive grains 3 partially protrude from the binder layer 4, as shown in FIG. 8, and the protrusion 3a of the abrasive grains 3 forms a sharp cutting edge. It acts on the machined surface of the object to perform grinding.

[Problem that the invention seeks to solve]

However, when the Borazon grinding wheel is used for traverse grinding, a feed motion is applied to the object to be ground or the grinding wheel, and the grinding point moves from side to side, so that the cut by the grinding wheel is inevitably made at one end or both ends of the left and right movement (see Fig. 6). A, B in
), and only both ends of the whetstone wear out quickly. Therefore, it is necessary to frequently shape (truing) the grindstone, resulting in poor work efficiency. In contrast, in plunge grinding, there is no left-right movement of the grinding point, so the entire pressure contact surface of the grinding wheel wears evenly, resulting in a long life of the grinding wheel and good work efficiency. However, plunge grinding requires precision.

The finished surface roughness is slightly inferior to traverse grinding.Therefore, it is desired that traverse grinding, which has excellent accuracy, has a grinding wheel life equivalent to or longer than that of plunge grinding, but this has not yet been achieved.

The present invention was made in view of the above circumstances, and an object thereof is to provide a grinding method and a grinding wheel used therein, in which the life of the grinding wheel is longer than that of plunge grinding even in traverse grinding.

[Means for solving problems]

In order to achieve the above object, the present invention rotatably supports a grindstone in which abrasive grains are held by a binding material, and presses the ground surface of an object to be ground against the grinding surface of the grindstone while rotating the grindstone. A grinding method for grinding the object to be ground,
As the above-mentioned grindstone, the above-mentioned grinding is carried out by using a grindstone configured such that the belt-shaped ring with the grinding surface is inclined with respect to the rotation axis, and the surface in pressure contact with the object to be ground is parallel to the rotation axis. The first gist is a grinding method in which pressure welding is performed intermittently and the grinding point during pressure welding always moves laterally along the axis of rotation of the whetstone, and the abrasive grains are held by a binding material. The second aspect is a grinding wheel configured such that the belt-shaped ring formed by the grinding surface is inclined with respect to the rotation axis, and the surface in pressure contact with the object to be ground is parallel to the rotation axis. do.

In other words, as a result of a series of studies to solve the drawback of traverse grinding in which only both ends of the grinding wheel wear out quickly, the inventor found that the grinding wheel in plunge grinding has a long lifespan by evenly using its entire grinding surface as a pressure contact surface. Inspired by the idea of maintaining It was discovered that even when an object is fed in the axial direction, the entire grinding surface of the grindstone is evenly used as a pressure contact surface, which lengthens the life of the grindstone, leading to the development of the present invention.

Next, the present invention will be explained in detail based on examples.

〔Example〕

FIG. 1 shows an embodiment of the grinding wheel of the present invention. That is, in this grinding wheel, a belt-shaped grinding surface 10 is formed on a part of the side surface of a cylindrical aluminum base metal 9. As shown in FIG. 2, the grinding surface lO is a band-shaped ring inclined with respect to the rotation axis A, and is formed so that the pressure contact surface 12 with the object to be ground 11 is parallel to the rotation axis A. ing.

This grinding wheel can be manufactured, for example, as follows. That is, first, CBN is added to the resinoid binder.
Add a predetermined amount of abrasive grains and mix uniformly. This mixture is applied to the side surface of the aluminum base metal 9 in a band shape as shown in FIG. Then, when this is put into a furnace and sintered,
The desired grinding wheel can be obtained. In addition, in the above manufacturing method, the types of binder and abrasive grains are appropriately selected in addition to those mentioned above depending on the purpose.

Grinding using this grinding wheel has the following characteristics. That is, as shown in FIG. 3, when the table (not shown) is moved in the direction of the arrow and the object 11 to be ground is subjected to traverse grinding, the cutting point of the grindstone is sequentially moved from point P shown in the figure to the grinding surface 10 of the grindstone. The grinding surface 10 is moved to the left on one side edge 10a (in other words, if the feed direction is reversed, the cutting point moves on the other side edge 10b). Since it is formed at an angle with respect to the axis A, the illustrated point P moves on the side surface of the grinding wheel as shown by the broken line B as the grinding wheel rotates.Therefore, the grinding surface 10 of the grinding wheel is intermittently It is in pressure contact with the object 11, and grinding is performed intermittently.As can be seen from FIG. It is assumed that the grinding surface 10 near both ends of the grinding wheel experiences less wear because the time it takes for the grinding surface to pass through the grinding surface becomes shorter.

In this way, in this grinding wheel, since the grinding surface 10 is formed in a band-shaped ring inclined with respect to the grinding wheel rotation axis A, when the grinding wheel and the object to be ground 11 are brought into pressure contact, the cutting points are sequentially formed in the band-shaped ring. Since it moves along the ring side edge and the cutting point is not fixed at two locations on both ends of the grindstone like in conventional grindstones, sharp cuts can be made at all times. Moreover, the grinding surface at the center of the grindstone, which conventionally was removed by shaping when both ends of the grindstone wore out without contributing much to the grinding, now contributes to the grinding without groove shoulders, resulting in good grinding efficiency. Furthermore, since the grinding by the grinding surface 10 is performed intermittently, the life of the grinding wheel itself becomes longer, heat generation during grinding becomes intermittent, and damage to the grinding wheel and the object to be ground 11 is reduced. In addition, when applying coolant to the grinding area, the removal efficiency and cooling efficiency of grinding debris was poor in the past, but the above-mentioned gaps in intermittent grinding are more efficient (removal of grinding debris and cooling of the grinding point are possible). Therefore, grinding progresses smoothly.As described above, when this grindstone is used, there is less wear on the grindstone and the grinding efficiency is high, so it has the advantage that heavy grinding can be performed in addition to normal grinding. Since the grinding point is constantly moved laterally along the rotation axis by the rotation of the grindstone, it is possible to obtain extremely superior finished surface accuracy compared to conventional grinding.

Although cylindrical grinding has been described above, similar effects can be obtained even when applied to surface grinding or internal grinding. especially,
In surface grinding, the pressure contact area between the grinding wheel and the object to be ground is large, so heat generation at the grinding site has traditionally been a major problem, but this problem can be solved by using the above-mentioned grindstone of the present invention, which generates less heat. resolved.

In addition to the grinding wheel shown in FIG. 1, the grinding wheel of the present invention may be one shown in FIG. 5.

That is, it is a grindstone in which the side surface of the grindstone itself is inclined with respect to the rotation axis A, and the entire side surface serves as an abrasive grain holding area that forms the grinding surface IO. However, a base metal 13 that rotatably holds the grindstone is provided at the center of rotation.

〔Effect of the invention〕

As described above, the grinding wheel of the present invention is configured such that the belt-shaped ring formed by the grinding surface is inclined with respect to the rotation axis, and the surface in pressure contact with the object to be ground is parallel to the rotation axis. As a result, the cutting point of the grinding wheel on the workpiece moves sequentially and is not fixed, and the entire grinding surface becomes a groove shoulder. Accuracy can be obtained.Moreover, since the grinding surface diagonally crosses the direction of rotation, grinding is performed intermittently.Therefore, when the above grindstone is used for grinding, the heat generated during grinding is also intermittent. In combination with this and the suppression of heat generation, this invention realizes excellent grinding with less damage and wear to the grinding wheel and the workpiece. It is effective in grinding. Also, since the cooling effect of removing grinding debris and cooling the grinding point by applying coolant is large, and the depth of cut can be made deep, it can also be applied to heavy grinding.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the grinding wheel of the present invention, Fig. 2 is a perspective view thereof, Fig. 3 is an explanatory view explaining its usage, and Fig. 4 shows the grinding surface of the above embodiment. Developed view shown, No. 5
The figure is a front view showing another embodiment of the grinding wheel of the present invention.
FIG. 7 and FIG. 7 are explanatory views for explaining a conventional example, and FIG. 8 is a cross-sectional view showing the structure of the grindstone. 10... Grinding surface 11... Object to be ground 12... Pressure contact surface Fig. 1 Fig. 2 Fig. P' Fig. 3 Fig. 4 Fig. 5 Fig. 6 (a) (b) Fig. 7 Fig. 8 (Volunteer to write amendments to figure procedures) September 3, 1961

Claims (4)

[Claims] (1) Grinding the object to be ground by rotatably supporting a grindstone in which abrasive grains are held by a binding material, and pressing the surface of the object to be ground against the grinding surface of the grindstone while rotating the grindstone. In this grinding method, the grinding wheel has a grinding surface formed in a band-shaped ring around the rotation axis, this band-shaped ring is inclined with respect to the rotation axis, and the surface in pressure contact with the object to be ground is in contact with the rotation axis. The grinding wheel configured to be parallel to the grinding wheel is used to perform the pressure welding intermittently during the grinding process, and the grinding point during the pressure welding is always moved laterally along the axis of rotation of the grindstone. Grinding method. (2) A grinding wheel in which abrasive grains are held by a binding material, the grinding surface is formed in a band-shaped ring around the rotation axis, and this band-shaped ring is inclined with respect to the rotation axis, and the object to be ground is A grinding wheel characterized in that the surface in pressure contact with the grinding wheel is configured to be parallel to the rotation axis. (3) The grinding wheel according to claim 2, wherein the entire grinding wheel has a cylindrical shape, and the abrasive grain holding region forming the grinding surface extends around the side surface in a band shape. (4) The grinding wheel according to claim 2, wherein the entire side surface of the grinding wheel is an abrasive grain holding area forming a grinding surface.