JPH08155800A - Method and equipment for conducting simultaneous centerless grinding of inner & outer circumference of cylindrical member - Google Patents

Abstract

PURPOSE: To eliminate the re-holding of a work, and to make the inner circumferential finished surface concentric with the outer circumferential finished surface by achieving the centerless grinding of the outer circumferential surface of the cylindrical work by a grinding wheel which is a rotary member together with the centerless grinding of the inner circumferential surface. CONSTITUTION: In grinding the inner and outer circumferences of a cylindrical work 5, a grinding wheel mechanism G is driven in the direction of the arrow (a), and a grinding wheel 4 is radially fed in the direction of the arrow (a) to start the grinding of the outer circumferential surface. In this condition, an inner grinding wheel 6 is approaches in the direction of the arrow (b) and inserted in the cylindrical work 5 to achieve the centerless grinding of the inner circumferential surface together with the centerless grinding of the outer circumferential surface. The inner grinding wheel 6 is radially fed in the direction to approach to the contact line of the cylindrical work 5 with an adjusting grinding wheel 3 while the inner grinding wheel 6 is vibrated in the direction of the shaft center 6s of the inner grinding wheel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to centerless grinding, in which a workpiece is inscribably supported by a blade and an adjusting grindstone while being rotated by a rotating grindstone for grinding. The present invention relates to a method and a centerless grinding apparatus, and in particular, "of a cylindrical member, which enables centerless grinding of an outer peripheral surface and an inner peripheral surface of a cylindrical workpiece at the same time,
The present invention relates to "a method for simultaneously performing centerless grinding of the outer circumference" and "a device for simultaneously performing centerless grinding of the inner and outer peripheral surfaces of a cylindrical workpiece.

In the present invention, "centerless grinding" and "centerless grinding" are synonymous. Further, in the present invention, "to grind the inner and outer peripheral surfaces at the same time" means to perform the inner peripheral surface grinding and the outer peripheral surface grinding in parallel, and the inner peripheral surface grinding and the outer peripheral surface grinding are not necessarily performed at the same time. It does not mean to start and end at the same time.

[0003]

2. Description of the Related Art FIG. 6 is a schematic front view shown for explaining the basic structure and function of a centerless grinder. A workpiece 1 having a cylindrical outer peripheral surface is placed on a blade 2 and supported by the blade 2 and an adjusting grindstone 3. This support is made by the top surface of the blade 2 and the outer peripheral surface of the adjusting grindstone 3, and the center axis of the workpiece 1 is not detected and positioned. The adjusting grindstone 3 is rotated in the direction of the arrow R ₁ by a driving device (not shown), and the workpiece 1 in contact with this is rotated as indicated by the arrow L. The grinding wheel 4 is rotatably driven in the direction of the arrow R ₂ at a peripheral speed higher than the peripheral speed of the workpiece 1 rotating in the direction of the arrow L, and slidably touches the workpiece 1. Grind to a true cylindrical surface. The angle α in the drawing is the apex angle of the blade 2, the dimension H is the center height, the angle β is the center angle for the grinding wheel, the angle γ is the center angle for the adjusting wheel, and the angle (β + γ) is the center angle. . These values must be strictly controlled for high-accuracy centerless grinding, but it is difficult to uniquely calculate them by formulas, and they include elements set based on advanced knowledge and many years of experience. It is the current situation.

In the figure, XX in the drawing is a straight line connecting the center point 3s of the adjusting grindstone 3 and the center point 4s of the grinding wheel 4 and is not necessarily a horizontal axis. When the configuration shown in FIG. 6 is three-dimensionally understood, XX represents a plane. This XX is the center line 3s of the adjusting grindstone 3.
And a center line 4s of the grinding wheel 4. For convenience of explanation, this plane will be referred to as a reference plane.

[0005]

The basic structure of centerless grinding (centerless grinding) shown in FIG. 6 is for grinding a cylindrical outer peripheral surface, and exhibits a highly accurate circle forming function. Thus, highly efficient grinding can be performed. However, when the workpiece has a cylindrical shape, it is suitable for grinding the outer peripheral surface, but not suitable for grinding the inner peripheral surface. For example, when the workpiece 1 in FIG. 6 has a cylindrical shape, after grinding the outer peripheral surface (or before grinding the outer peripheral surface) as shown in the figure, the inner peripheral surface must be ground as an independent process. . At this time, operations such as unloading, carrying, and loading of the work piece have to be performed, which wastes time and reduces efficiency. In addition, since the outer peripheral surface grinding and the inner peripheral surface grinding are alternately performed, the concentricity between the outer peripheral finished surface and the inner peripheral finished surface becomes poor. The present invention has been made in view of the above circumstances, and provides a method for simultaneously (concurrently) grinding an outer peripheral surface and an inner peripheral surface of a cylindrical workpiece, and the above novel method. The object is to provide a device suitable for implementation. It is of course expected that the efficiency will be improved by simultaneous grinding of the inner and outer peripheral surfaces, and because simultaneous grinding does not require "handover of the work piece", the inner and outer surfaces are ground in the same positioning state. Naturally, the concentricity between the peripheral surface and the peripheral surface is also improved.

[0006]

The invention according to the present application is directed to a method of the first invention for a straight cylindrical workpiece, and a first method for carrying out the method of the first invention.
Of the invention, a method of the second invention for a cylindrical workpiece with a flange, a device of the second invention for carrying out the method of the second invention, and a straight type A method of the third invention that is reasonably adaptable to both cylindrical and flanged cylindrical workpieces, and
It comprises a device of the third invention for carrying out the method of the third invention, and an embodiment for further promoting the effect of each of the above-mentioned six inventions in total. Of the six inventions, the method of the first invention is such that a blade, which is a stationary member, and an adjusting grindstone, which is a rotating member, support a cylindrical workpiece, and friction transfer from the adjusting grindstone causes the cylinder to work. While rotating the workpiece, the inner grinding wheel, which is a rotating member, is positioned inside the cylindrical work, and the outer peripheral surface of the inner grinding stone and the inner peripheral surface of the cylindrical work are lined. Make contact in a state similar to contact, and use the above internal grinding wheel,
While performing centerless grinding of the inner peripheral surface of the cylindrical workpiece by cutting and feeding in a direction approaching the "contact line between the workpiece and the adjusting grindstone", in parallel with the centerless grinding of the inner peripheral surface The outer peripheral surface of the cylindrical workpiece is centerless ground by a grinding wheel that is a rotating member. The above-mentioned "state equivalent to line contact" is line contact from a macro point of view, but "line" with no solid geometrical thickness.
It means a state in which the contact is made with a narrow contact width, instead of being contacted with. The device of the first invention created to easily carry out the above-mentioned first invention method and exert its effect is provided with a blade that is a stationary member, and a cylindrical workpiece in cooperation with the blade. An adjusting grindstone which is a rotating member having a cylindrical surface for supporting and rotating the workpiece by friction transmission, and a rotating member having a cylindrical surface for contacting and grinding the outer peripheral surface of the workpiece. Grinding wheel and the inner peripheral surface of the workpiece can be moved in and out,
An internal grinding stone that is cut and fed in a direction approaching the "contact line between the workpiece and the adjusting grindstone".

In the second invention method, a cylindrical workpiece with a flange is supported by a blade that is a stationary member and an adjusting grindstone that is a rotating member, and the cylindrical cylinder with the flange is supported by friction transmission from the adjusting grindstone. While rotating the work piece of, the inner grinding wheel as a rotating member is positioned in the work piece with a flange, and the outer peripheral surface of the inner grinding wheel and the inner peripheral surface of the flanged cylindrical work piece Make contact in a state similar to line contact, and feed the above-mentioned internal grinding stone in the direction of approaching the "contact line between the workpiece and the adjusting stone" to feed the inner peripheral surface of the flanged cylindrical workpiece. While performing centerless grinding, in parallel with the centerless grinding of the inner peripheral surface, the side surface of the flange-shaped portion of the cylindrical workpiece with a flange by the conical grinding wheel that is a rotating member, and the outer peripheral surface of the cylindrical portion. The Characterized by Thales grinding. The apparatus of the second invention for carrying out the method of the second invention comprises a blade, which is a stationary member, and a cylindrical workpiece with a flange that cooperates with the blade to support the workpiece by friction transmission. To rotate an object, an adjusting grindstone that is a rotating member having a cylindrical surface, and to grind it by contacting the side surface of the flange-shaped cylindrical member and the outer peripheral surface of the cylindrical member of the flanged cylindrical member that is the workpiece, The grinding wheel, which is a rotating member having a conical surface, can be moved in and out of the inner peripheral surface of the workpiece, and is fed by cutting in a direction approaching the "contact line between the workpiece and the adjusting wheel". The internal grinding wheel is provided.

According to a third method of the present invention, a cylindrical work piece is supported by a blade that is a stationary member and an adjusting grindstone that is a rotating member, and the cylindrical work piece is supported by friction transmission from the adjusting grindstone. While rotating the, the internal grinding wheel is a rotating member is positioned in the cylindrical workpiece, in a state in which the outer peripheral surface of the internal grinding stone and the inner peripheral surface of the cylindrical workpiece are in line contact. While contacting the inner grinding wheel, the inner grinding surface of the cylindrical work piece is centerless ground by cutting and feeding the inner grinding wheel in the direction of approaching the "contact line between the work piece and the adjusting whetstone". In parallel with the centerless grinding of the peripheral surface, the centerless grinding of the outer peripheral surface of the cylindrical workpiece by the grinding wheel which is a rotating member, and the grinding wheel which is the rotating member is replaced with a conical grinding wheel, Rotating axis of grinding wheel is horizontal By rotating the adjustment grindstone with respect to the rotary shaft of the adjusting grindstone and the rotary shaft of the internal grinding grindstone so that the conical surface of the conical grinding grindstone faces the outer peripheral surface of the workpiece, and is a stationary member. While supporting the cylindrical workpiece with a flange by the blade and the adjusting grindstone that is a rotating member, and rotating the cylindrical workpiece with the flange by friction transmission from the adjusting grindstone, The grinding wheel is positioned in the work piece with a flange, and the outer peripheral surface of the inner grinding wheel and the inner peripheral surface of the cylindrical work piece with a flange are brought into contact with each other in a state similar to line contact, and the above-mentioned inner grinding wheel , While performing centerless grinding of the inner peripheral surface of the cylindrical workpiece with a flange by cutting and feeding in the direction of approaching the "contact line between the workpiece and the adjusting grindstone",
In parallel with the centerless grinding of the inner peripheral surface, centerless grinding of the side surface of the flange-shaped portion of the cylindrical workpiece with a flange and the outer peripheral surface of the cylindrical portion by a conical grinding wheel that is a rotating member. Is characterized by. In order to carry out the method of the third invention, the apparatus of the third invention is configured to support a blade which is a stationary member and a cylindrical or straight cylindrical workpiece with a flange in cooperation with the blade by friction transmission. Select one of an adjusting grindstone that is a rotating member having a cylindrical surface, a grinding grindstone that is a rotating member having a cylindrical surface, and a grinding grindstone that is a rotating member having a conical surface, which rotates the workpiece. A grinding wheel mechanism having a function of rotating the grinding wheel while supporting it and tilting the rotation center axis of the grinding wheel in a plane parallel to the reference plane; and an inner circumference of the workpiece. It is characterized in that it is provided with an internal grinding stone that can be moved in and out of the surface and is cut and fed in a direction approaching the "contact line between the workpiece and the adjusting grindstone".

[0009]

According to the method of the present invention, a straight cylindrical or flanged cylindrical workpiece is supported by the blade and the adjusting grindstone in an incenterless manner. The peripheral surfaces are each ground. That is, since the inner and outer peripheral surfaces are ground in the same bearing state, the concentricity of the inner and outer peripheral surfaces becomes extremely accurate. In addition, since the inner and outer peripheral surfaces are ground at the same time under the same bearing condition, construction can be performed with high efficiency without causing idle time such as transportation and rechecking. The device according to the present invention is
Since the above-mentioned invented method is provided with the members indispensable for carrying out the above-mentioned invented method, and the members are rationally arranged, the above-mentioned invented method can be easily carried out and its effect can be sufficiently exhibited.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, referring to FIG. 1 to FIG.
An embodiment of the present invention will be described. FIG. 1 is a schematic plan view showing one embodiment of a centerless grinding apparatus according to the present invention configured to carry out a method for simultaneously performing centerless grinding of the inner and outer diameters of a cylindrical member according to the present invention. is there. When the configuration of this embodiment is roughly classified, the blade 2 which is a stationary member, the adjusting grindstone mechanism R which supports and rotates the adjusting grindstone 3 having the cylindrical surface, and the grinding grindstone 4 which has the cylindrical surface are supported and rotated. It comprises a grinding wheel mechanism G for rotating and an inner grinding wheel mechanism N for supporting and rotating the inner grinding wheel 6 having a cylindrical surface. Three
a is an adjusting grindstone shaft that supports and rotates the adjusting grindstone 3;
3s is a center line of the adjusting grindstone shaft 3a. 3b is a worm wheel for deceleration transmission. The grinding wheel mechanism G in the apparatus of the present embodiment feeds by cutting in the direction of the arrow a while keeping the axis 4s of the grinding wheel parallel to the adjustment wheel axis 3s. Further, the internal grinding wheel mechanism N in the present embodiment keeps the internal grinding wheel axis 6s parallel to the adjusting wheel axis 3s,
An approach is fed in the direction of the axis 6s of the internal grinding wheel as indicated by an arrow b. By this approach operation, the internal grinding wheel 6 enters into the space surrounded by the inner peripheral surface of the cylindrical workpiece 5. The internal grinding wheel mechanism N can also retract the internal grinding wheel 6 in the direction opposite to the arrow b to restore it to the position shown in FIG.

The cylindrical work piece 5 is supported by a stationary blade 2 and a rotating adjusting grindstone 3, and is rotated by friction transmission from the adjusting grindstone 3. In order to grind the inner and outer peripheries of the workpiece 5, first, the grinding wheel mechanism G is driven in the direction of arrow a, the grinding wheel 4 is cut and fed in the direction of arrow a, and outer peripheral surface grinding is started. Figure 2
Is a schematic diagram of a state in which the grinding wheel 4 in the above-described embodiment shown in FIG. 1 is cut and fed in the direction of the arrow a, brought into contact with the outer peripheral surface of the cylindrical work piece, and the outer peripheral surface is subjected to centerless grinding. FIG. In the state of FIG. 2, the internal grinding wheel 6 has not yet contacted the cylindrical workpiece 5, and only the outer peripheral surface is being ground by the grinding wheel 4. The centerless grinding of the outer peripheral surface in this state is performed in the same manner as the conventional centerless grinding shown in FIG. 6 with the same action, and the outer peripheral surface of the workpiece 5 becomes a highly accurate true cylindrical surface. Can be finished. FIG.
From the state of the embodiment shown in FIG. 2 above, the internal grinding wheel 6 is approached in the direction of the arrow b, inserted into the cylindrical workpiece, and the inner peripheral surface is removed along with the centerless grinding of the outer peripheral surface. It is a typical top view of the state where it is performing centerless grinding. In the present embodiment, the internal grinding wheel 6 is vibrated (oscillated) in the axial direction 6s of the internal grinding wheel, and the internal grinding wheel 6 is used as a "contact line between the cylindrical workpiece 5 and the adjusting wheel 3". Cut and feed in the direction of approaching. Since the cylindrical workpiece 5 is supported by the blade 2 and the adjusting grindstone 3 and is rotated by the adjusting grindstone, the internal grinding grindstone 6 is moved in the "direction toward the contact line" as described above. Stable centerless grinding is performed by making a cut. As in this example,
When the internal grinding wheel 6 is subjected to oscillation, the surface roughness of the ground finished surface is improved. However, the reason why the present embodiment can give oscillation to the inner grinding wheel 6 is that the inner grinding wheel 6 has a cylindrical outer peripheral surface, and the inner grinding wheel 6 has an outer peripheral surface having a conical surface. It is difficult to oscillate with a grinding wheel.

Although not shown in the drawings, as an embodiment different from FIGS. 1 to 3, when the axis 6s of the inner grinding wheel 6 having a cylindrical outer peripheral surface is tilted in the direction of the arc arrow θ and is aligned in the 6s ′ direction, While oscillating the internal grinding wheel 6 in the 6s' direction, the inner peripheral surface of the workpiece can be ground and finished into a concave conical surface.

In order to finish the inner peripheral surface of the work piece into a concave conical surface, an inner grindstone (not shown) having a conical outer peripheral surface is used with the inner grindstone axis 6s as the rotation center axis. It can be rotated, but in this case, the inner peripheral surface is ground without applying oscillation.

Although FIG. 1 described above illustrates the state immediately before the start of the substantial grinding, it is similar to FIG. 1 immediately after the substantial grinding is completed. As can be easily understood from this figure, when the cylindrical workpiece 5 is at the grinding position supported by the blade 2 and the adjusting grindstone 3, the internal grinding wheel mechanism N is positioned on the extension of the center line. Therefore, the loading of the cylindrical workpiece 5 is preferably performed by descending from above in the direction orthogonal to the paper surface. For the same reason, unloading is suitable to be lifted upward in the direction perpendicular to the plane of the drawing. In this embodiment, a transporting means (not shown) is provided to chuck the cylindrical work piece and perform vertical loading and unloading. The above-mentioned chuck is not limited to being gripped by the sandwiching claw, and an appropriate known device such as vacuum suction or magnetic force holding can be applied.

Next, the operation sequence of the apparatus of the embodiment constructed as above will be described. FIG. 4 is an operation timing chart of an embodiment of an apparatus for simultaneously and centerlessly grinding the inner and outer circumferences of the cylindrical member shown in FIGS. 1 to 3 above.
The horizontal axis represents the time axis that is common to all figures, and (A)
Is the external cutting depth operating curve, (B) is the internal cutting depth operating curve, (C) is the operating stroke of the outer diameter sizing head that automatically measures the outer diameter of the workpiece, (D) Is the operation stroke of the inner diameter sizing head that automatically measures the inner diameter of the workpiece, (E) is the approach stroke of the internal grinding wheel mechanism, and (F) is the oscillation operation of the internal grinding stone. There is. The external cutting is started at time t ₀ . However, the grinding wheel does not immediately come into contact with the workpiece to start grinding (details will be described later). At the same time t ₀ , the outer diameter sizing head starts moving toward the operating position (the position where the outer diameter of the workpiece is measured), and the inner grinding wheel starts the approach operation. t ₀
Next, at time t ₁ , the outer diameter sizing head reaches the operating position and starts to output a measurement signal (point c) At this time t ₁ , the approach of the grinding wheel ends (point c ′), that is, internal grinding. The grindstone 6 enters the cylindrical work 5 and ends. At this time (t ₁ ), the Internal Research Oscillation starts operating. At time t ₂ next to t _1, the inner diameter sizing head starts to output the measurement signal reaches the operating position (position for measuring the inner diameter of the workpiece) (point d). At this time, (t ₂ ) the oscillation of the internal polishing oscillation is constantly stabilized (point d ′). Around the time t ₂ described above, the grinding wheel 4 that has been operated for external cutting contact comes into contact with the outer periphery of the workpiece to start the outer peripheral surface grinding (point e). After the outer peripheral surface grinding start time t ₂ , the internal grinding wheel 6 reaches the inner peripheral surface of the workpiece at time t ₃ and comes into contact therewith to start the inner peripheral surface grinding (point f).

As shown in FIG. 4A, the outer peripheral surface grinding is started at time t ₂ (point e), and the outer peripheral surface grinding is finished at time t ₈ (point p). As shown in FIG. 4B, the inner peripheral surface grinding is started at a time t ₃ (point f) which is later than the start time t _{2 of} the outer peripheral surface grinding, and the time t is preceded by the end time t ₈ of the outer peripheral surface grinding. _The inner peripheral surface grinding is completed at 5. (Point i). In this way, the inner peripheral surface is ground only while the outer peripheral surface is being ground. The reason is that, while the outer peripheral surface is being ground, the grinding reaction force of the grinding wheel with respect to the work piece gives a rotating force to the work piece, and the adjusting whetstone gives a braking force to the work piece. Since the bearing / rotation state is relatively stable, the inner peripheral surface is ground in parallel in this state. In other words, while grinding the inner surface,
Avoid giving disturbing factors from the outer peripheral surface grinding. As shown in FIG. 4 (B), the progress speed of the internal polishing cut changes between the start point f of the inner peripheral surface grinding and the end point i of the same. It indicates that the inner peripheral surface is roughly ground and the inner peripheral surface is precisely grounded between points g and i. On the other hand, as shown in FIG. 4A, the outer peripheral surface rough grinding is performed between points e and h, and the outer peripheral surface fine grinding is performed between points j and p. Then, between the points h and j, the cutting feed rate is made zero by the mask in which the grinding wheel is brought into contact with the surface to be ground, and the external polishing waiting state is set. Between the point h (time t ₄ ) and the point j (time t ₅ ) in the above waiting state for external research, the cylindrical member which is the workpiece is in the quietest state, so that the inner peripheral surface is in the meantime. Fine grinding is performed. At the time t ₅ when the inner peripheral surface fine grinding is finished, the outer peripheral surface fine grinding is started (point j), and when the outer peripheral surface fine grinding is finished at the point p (time t ₈ ), the grinding wheel moves in the direction opposite to the cutting direction. At time t ₉ (point q), one cycle is completed.

In the embodiment described above, the inner and outer peripheral surfaces of the straight cylindrical work piece are subjected to centerless grinding. By applying this technique, the inner and outer peripheral surface of the flanged cylindrical work piece can be processed. It is also possible to perform simultaneous centerless grinding of the flange side surface (second invention). FIG. 5 shows that the present invention is applied to centerlessly grind an outer peripheral surface and a flange side surface of a flanged cylindrical work piece with a conical grinding wheel, and simultaneously grind the inner peripheral surface of the work piece with an internal grinding wheel. Doing 1
FIG. 6 is a schematic plan view showing an example and partially broken. A technique for centerlessly grinding the side surface of the flange-shaped portion 7b and the outer peripheral surface of the cylindrical portion 7a at the same time by a grinding wheel 8 having a conical outer periphery is known (for example, "Processing Technology" issued by the Institute of Mechanical Engineers, Japan Technical Research Institute). Data file "(19
1982, Volume 6) Centerless grinding). When the simultaneous centerless grinding of the inner peripheral surface by the internal grinding wheel 6 according to the present invention is applied to such a known technique, the side surface of the flange-shaped portion 7b of the cylindrical workpiece 7 with a flange and the inner and outer peripheral surfaces of the cylindrical portion 7a. It is possible to perform simultaneous non-center grinding on three surfaces. In this embodiment (FIG. 5), the adjustment grindstone shaft center 3s and the internal grinding wheel shaft center 6s are parallel to each other, and the grinding wheel shaft center 8s is parallel to them.
Is inclined.

The above-mentioned FIG. 1 (first invention) and this FIG. 5 (second invention)
1) for grinding a straight cylindrical work piece 5, the grinding wheel 4 having a cylindrical surface is replaced with a conical grinding wheel 8 as will be understood by comparison with the invention of FIG. By tilting the grinding wheel axis 4s in a plane parallel to the reference plane, a state equivalent to that of FIG. 5 (the second invention) is obtained, and three-sided simultaneous centerless grinding of the flanged workpiece 7 is possible. (Third invention). In each of the above-mentioned first to third inventions, since the inner and outer circumferences are simultaneously subjected to uncentered grinding, highly accurate roundness can be obtained by a circular forming function peculiar to uncentered grinding, and "to change the work piece" Since centerless grinding of the inner and outer diameters is performed without performing it, not only the efficiency improvement but also the finish surface accuracy improvement can be obtained. In particular, high accuracy can be obtained for the concentricity of the inner and outer peripheral surfaces.

[0019]

When the method of the present invention is applied, in a state where a straight cylindrical or flanged cylindrical work piece is supported by the blade and the adjusting grindstone in an incenterless manner, the outer peripheral surface is ground by the grinding grindstone, and the internal grindstone is The inner peripheral surface is ground by. That is, since the inner and outer peripheral surfaces are ground in the same bearing state, the concentricity of the inner and outer peripheral surfaces becomes extremely accurate. In addition, since the inner and outer peripheral surfaces are ground at the same time under the same bearing condition, construction can be performed with high efficiency without causing idle time such as transportation and rechecking. Since the device according to the present invention is provided with the members indispensable for carrying out the above-mentioned invention method and is rationally arranged, the above-mentioned invention method can be easily carried out and its effect is sufficiently exerted. It has an excellent practical effect that it can be demonstrated to the full.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of a centerless grinding apparatus according to the present invention configured to carry out a method for simultaneously performing centerless grinding of the inner and outer diameters of a cylindrical member according to the present invention. Is.

FIG. 2 is a grinding wheel 4 in the embodiment shown in FIG. 1 above.
FIG. 4 is a schematic plan view showing a state in which is cut and fed in the direction of arrow a, is brought into contact with the outer peripheral surface of the cylindrical workpiece, and the outer peripheral surface is subjected to centerless grinding.

FIG. 3 is a view showing an internal grinding wheel 6 approached in the direction of arrow b from the state of the embodiment shown in FIG. 2 above, inserted into a cylindrical workpiece, and carried out in parallel with centerless grinding of the outer peripheral surface. It is a schematic plan view of the state where the peripheral surface is subjected to centerless grinding.

FIG. 4 is an operation timing chart in the embodiment of the apparatus for simultaneously and centerlessly grinding the inner and outer peripheries of the cylindrical member shown in FIGS. 1 to 3 above, and the horizontal axis is the time axis common to the entire figure. (A) shows the external cutting cut operating curve,
(B) shows the internal cutting cut operation curve, (C) shows the operation stroke of the outer diameter sizing head that automatically measures the outer diameter of the workpiece.
(D) is the operation stroke of the inner diameter sizing head that automatically measures the inner diameter of the workpiece, (E) is the approach stroke of the internal grinding wheel mechanism, (F) is the oscillation operation of the internal grinding stone, Each represents.

FIG. 5 is a perspective view of an outer peripheral surface and a flange side surface of a cylindrical workpiece with a flange to which the present invention is applied, in which the inner peripheral surface of the workpiece is uncentered by an internal grinding wheel while performing concentric grinding with a conical grinding wheel. FIG. 3 is a schematic plan view showing an example of grinding and is partially broken.

FIG. 6 is a schematic front view shown for explaining the basic structure and function of the centerless grinder.

[Explanation of symbols]

1 ... Workpiece, 2 ... Blade, 3 ... Adjusting grindstone, 3a ... Adjusting grindstone axis, 3b ... Worm wheel, 3s ... Adjusting grindstone axis, 4 ... Grinding grindstone, 4s ... Grinding grindstone axis, 5 ... Cylindrical object Workpiece, 6 ... Internal grinding wheel, 6s, 6s' ... Internal grinding wheel axis,
7 ... Cylindrical workpiece with flange, 7a ... Cylindrical part,
7b ... Flange portion, 8 ... Conical grinding wheel, 8s ... Grinding wheel axis.

Claims (26)

[Claims] 1. A blade, which is a stationary member, and an adjusting grindstone, which is a rotating member, support a cylindrical work piece, and while rotating the cylindrical work piece by friction transmission from the adjusting grindstone, The inner grinding wheel which is a rotating member is positioned in the cylindrical work piece, and the outer peripheral surface of the inner grinding wheel and the inner peripheral surface of the cylindrical work piece are brought into contact in a state conforming to line contact, Internal grinding wheel, "contact line between workpiece and adjusting wheel"
While performing centerless grinding of the inner peripheral surface of the cylindrical work piece by feeding in the direction of approaching to, it is performed in parallel with the centerless grinding of the inner peripheral surface, and the cylindrical work piece is processed by a grinding wheel that is a rotating member. A method for centerless grinding of the inner and outer circumferences of a cylindrical member, characterized by centerless grinding of the outer peripheral surface of the object. 2. A cylindrical workpiece with a flange is supported by a blade that is a stationary member and an adjusting grindstone that is a rotating member, and the cylindrical workpiece with the flange is supported by friction transmission from the adjusting grindstone. A state in which the inner grinding wheel, which is a rotating member, is positioned in the workpiece with the flange while rotating, and the outer peripheral surface of the inner grinding wheel and the inner peripheral surface of the cylindrical workpiece with the flange conform to line contact. Contact the above-mentioned internal grinding stone with the "contact line between the work piece and the adjusting stone".
While performing centerless grinding of the inner peripheral surface of the cylindrical workpiece with a flange by feeding in the direction of approaching to, it is performed in parallel with the centerless grinding of the inner peripheral surface by a conical grinding wheel that is a rotating member. Of the cylindrical member, characterized in that centerless grinding is performed on the side surface of the flange-shaped portion of the cylindrical workpiece with flange and the outer peripheral surface of the cylindrical portion,
A method to grind the outer periphery simultaneously. 3. A cylindrical workpiece is supported by a blade that is a stationary member and an adjusting grindstone that is a rotating member, and while rotating the cylindrical workpiece by friction transmission from the adjusting grindstone, The inner grinding wheel which is a rotating member is positioned in the cylindrical work piece, and the outer peripheral surface of the inner grinding wheel and the inner peripheral surface of the cylindrical work piece are brought into contact in a state conforming to line contact, Internal grinding wheel, "contact line between workpiece and adjusting wheel"
While performing centerless grinding of the inner peripheral surface of the cylindrical work piece by feeding in the direction of approaching to, it is performed in parallel with the centerless grinding of the inner peripheral surface, and the cylindrical work piece is processed by a grinding wheel that is a rotating member. Centerless grinding of the outer peripheral surface of the object, replacing the grinding wheel that is the rotating member with a conical grinding wheel, and rotating the rotation axis of the grinding wheel in a horizontal plane, By making the conical surface of the conical grinding wheel face the outer peripheral surface of the workpiece by obliquely intersecting with the rotation axis of the grinding wheel, a cylinder with a flange by a blade that is a stationary member and an adjusting wheel that is a rotating member -Shaped workpiece is supported, and while the flanged cylindrical workpiece is rotated by friction transmission from the adjusting grindstone, the internal grinding stone that is the rotating member is flanged workpiece. Positioned inside, the outer peripheral surface of the internal grinding wheel and the inner peripheral surface of the cylindrical workpiece with a flange are brought into contact with each other in a state similar to line contact. Line of contact with "
While performing centerless grinding of the inner peripheral surface of the cylindrical workpiece with a flange by feeding in the direction of approaching to, it is performed in parallel with the centerless grinding of the inner peripheral surface by a conical grinding wheel that is a rotating member. Of the cylindrical member, characterized in that centerless grinding is performed on the side surface of the flange-shaped portion of the cylindrical workpiece with flange and the outer peripheral surface of the cylindrical portion,
A method to grind the outer periphery simultaneously. 4. A rotary grindstone having a cylindrical surface is used as the internal grindstone, and the inner peripheral grindstone of the cylindrical surface-shaped rotary grindstone is oscillated to provide an inner peripheral surface of a workpiece having a cylindrical portion. To
A concave right circular cylinder surface is used for finishing.
A method for simultaneously and centerlessly grinding the inner and outer peripheries of the cylindrical member according to claim 3. 5. A rotary grindstone having a cylindrical surface is used as the inner grindstone, and the inner grindstone made of the cylindrical surface-shaped grindstone is oscillated while the inner peripheral surface of a workpiece having a cylindrical portion is applied. To
2. A concave right circular conical surface is used for finishing.
A method for simultaneously and centerlessly grinding the inner and outer peripheries of the cylindrical member according to claim 3. 6. A rotary grindstone having a conical surface is used as the internal grindstone, and the inner circumference of a workpiece having a cylindrical portion is provided without giving oscillation to the internal grindstone made of the conical surface rotary grindstone. A method for simultaneously centerlessly grinding the inner and outer circumferences of a cylindrical member according to any one of claims 1 to 3, characterized in that the surface is finished as a concave right circular conical surface. 7. (a) The cutting feed in the direction of approaching the workpiece while rotating the grinding wheel is started, and (b) the cutting feed of the grinding wheel is delayed and the internal grinding is performed. Characterized by starting the cutting feed in the direction of approaching the whetstone to the "contact line between the work piece and the adjusting whetstone",
A method for simultaneously centerlessly grinding the inner and outer circumferences of the cylindrical member according to any one of claims 1 to 4. 8. (c) After the grinding wheel comes into contact with the outer peripheral surface of the workpiece to start the outer peripheral surface grinding, (d) the inner grinding wheel comes into contact with the inner peripheral surface of the workpiece. Characterized by starting the inner peripheral surface grinding of the workpiece,
A method for performing centerless grinding of the inner and outer circumferences of the cylindrical member according to claim 7. 9. The method according to claim 9, wherein (e) the inner peripheral surface grinding of the work piece by the internal grinding grindstone is finished before the outer peripheral surface grinding of the work piece by the grinding grindstone is finished. A method for performing centerless grinding of the inner and outer circumferences of the cylindrical member according to claim 8 at the same time. 10. The step of grinding an outer peripheral surface of a workpiece by the grinding wheel is divided into a preceding outer peripheral surface rough polishing step and a subsequent outer peripheral surface fine polishing step, and the inner grinding wheel is used. The inner peripheral surface grinding process of the workpiece is divided into a preceding inner peripheral surface rough polishing process and a subsequent inner peripheral surface rough polishing process. The external polishing waiting period for stopping the cutting feed of the grinding wheel is provided between the step and the step of performing the internal peripheral surface polishing step during the external polishing waiting period. A method for performing centerless grinding of the inner and outer peripheries of the cylindrical member according to claim 9. 11. When starting the cutting feed of the internal grindstone, the operation of oscillation of the internal grindstone is started,
The oscillation operation of the internal grinding wheel is constantly stabilized until the internal grinding wheel comes into contact with the inner peripheral surface of the workpiece to start grinding the inner peripheral surface. A method for performing centerless grinding of the inside and the outside of the cylindrical member described at the same time. 12. A sensor which detects an outer peripheral surface of a workpiece and a inner peripheral surface thereof and outputs an electric signal, and based on the output signals of the sensor, the sensors (a) to (a) are used. e) controlling each step,
A method of performing centerless grinding of the inner and outer circumferences of the cylindrical member according to claim 9. 13. Prior to grinding the workpiece,
The workpiece is chucked by an automatic transfer means, loaded into the processing position from above the blade, supplied in a state supported by the blade and the adjusting grindstone, and after finishing the inner and outer circumference grinding, 14. The workpiece is chucked by the automatic transfer means, lifted up and carried out, and the inner and outer circumferences of the cylindrical member according to any one of claims 1 to 13 are simultaneously centerlessly ground. how to. 14. A blade, which is a stationary member, and an adjusting grindstone, which is a rotating member having a cylindrical surface, which cooperates with the blade to support a cylindrical workpiece and rotate the workpiece by friction transmission. And a grinding wheel that is a rotating member having a cylindrical surface that contacts the outer peripheral surface of the workpiece and grinds the outer peripheral surface of the workpiece, and a grinding wheel that can enter and retract into the inner peripheral surface of the workpiece. An internal grinding wheel which is fed by cutting in a direction approaching the "contact line between the object and the adjusting wheel", and a device for performing centerless grinding of the inner and outer peripheries of a cylindrical member at the same time. 15. A blade, which is a stationary member, and a rotating member having a cylindrical surface, which cooperates with the blade to support a cylindrical workpiece with a flange and rotate the workpiece by friction transmission. An adjusting whetstone, a grinding whetstone that is a rotating member having a conical surface, which contacts the side surface of the flanged cylindrical portion of the flanged cylindrical member that is the workpiece and grinds the outer peripheral surface of the cylindrical portion, and It is equipped with an internal grinding wheel that can be moved in and out of the inner peripheral surface of the work piece and that is fed by cutting in a direction approaching the "contact line between the work piece and the adjusting grindstone". A device that performs centerless grinding of the inside and outside of a cylindrical member at the same time. 16. A blade, which is a stationary member, and a cylindrical surface, which cooperates with the blade to support a cylindrical or straight cylindrical workpiece with a flange and rotate the workpiece by friction transmission. The function of rotating the adjusting grindstone that is a rotating member, the grinding grindstone that is a rotating member having a cylindrical surface, and the grinding grindstone that is a rotating member having a conical surface while selecting and supporting it. A grinding wheel mechanism having a structure capable of tilting the rotation center axis of the grinding wheel in a plane parallel to the reference plane, and capable of entering and retracting into the inner peripheral surface of the workpiece, An internal grinding grindstone that is cut and fed in a direction approaching the "contact line between the workpiece and the adjusting grindstone", and a device for centerless grinding of the inner and outer peripheries of a cylindrical member at the same time. 17. The method according to claim 14, further comprising an oscillation mechanism for reciprocating the internal grinding stone in a direction orthogonal to a cutting feed direction. This is a device that grinds the inner and outer circumferences of a cylindrical member at the same time. 18. The internal grinding wheel, wherein the internal grinding wheel has a shape having a cylindrical surface, and the center line of its rotation axis is inclined with respect to the center line of the rotation axis of the adjusting grindstone. Is grinding the inner peripheral surface of the workpiece while oscillating in a direction parallel to the center line of the internal grinding wheel,
18. An apparatus for centerlessly grinding the inner and outer peripheries of a cylindrical member according to claim 17, characterized in that the inner peripheral surface is finished into a concave conical surface. 19. The internal grindstone has a shape having a conical surface, the center line of its rotation axis is parallel to the center line of the rotary axis of the adjusting grindstone, and the internal grindstone is 2. The inner peripheral surface of a workpiece is ground without oscillation to finish the inner peripheral surface into a concave conical surface.
An apparatus for performing centerless grinding of the inner and outer circumferences of the cylindrical member according to any one of claims 4 to 16. 20. An automatic device for controlling the cutting feed of the grinding grindstone and the cutting feed of the internal grinding grindstone is provided, wherein the automatic control device comprises: (a) processing the workpiece while rotating the grinding grindstone; A direction for approaching the "contact line between the work piece and the adjusting grindstone" by starting the cutting feed in the direction of approaching the object, and (b) delaying the cutting feed of the grinding wheel and approaching the internal grinding wheel. 19. A device for performing centerless grinding of the inner and outer peripheries of a cylindrical member according to any one of claims 14 to 18, characterized in that it is provided with a program for starting the cutting feed. 21. An automatic device for controlling the cutting feed of the grinding wheel and the cutting feed of the internal grinding wheel is provided, wherein: (c) the grinding wheel is an outer periphery of a workpiece. A program is provided for starting the outer peripheral surface grinding by contacting the surface, and (d) contacting the inner grinding wheel with the inner peripheral surface of the workpiece to start the inner peripheral surface grinding of the workpiece. An apparatus for centerlessly grinding the inner and outer circumferences of the cylindrical member according to claim 20 at the same time. 22. An automatic device for controlling the cutting feed of the grinding stone and the cutting feed of the internal grinding stone is provided, wherein the automatic control device comprises: (e) an outer circumference of a workpiece by the grinding stone. 22. A cylindrical member according to claim 21, characterized in that a program for terminating the inner peripheral surface grinding of the workpiece by the internal grinding wheel is given before the surface grinding is terminated. ， A device that grinds the outer periphery simultaneously. 23. An automatic device for controlling the cutting feed of the grinding stone and the cutting feed of the internal grinding stone is provided, wherein the automatic control device grinds an outer peripheral surface of a workpiece by the grinding stone. Is divided into a preceding outer peripheral surface rough-polishing step and a subsequent outer peripheral surface rough-polishing step, and the inner peripheral surface grinding step of the workpiece with the above-mentioned internal grinding wheel is External grinding waiting period during which the cutting feed of the grinding wheel is stopped between the outer peripheral surface rough polishing step and the outer peripheral surface rough polishing step. 23. A cylindrical member according to claim 22, characterized in that a program for performing the inner peripheral surface fine-polishing step is provided during the outer-research waiting period. Equipment for grinding. 24. An automatic device for controlling the cutting feed of the grinding wheel, and the cutting feed of the internal grinding wheel and the oscillation operation is provided, and the automatic control device controls the cutting feed of the internal grinding wheel. When starting, start the operation of the oscillation of the internal grinding wheel, until the internal grinding wheel contact the inner peripheral surface of the workpiece to start the inner peripheral surface grinding,
24. A cylindrical member according to claim 23, characterized in that it is provided with a program arranged in timing so as to stably stabilize the oscillation operation of the internal grinding wheel. Device to do. 25. A sensor is provided which detects an outer peripheral surface diameter and an inner peripheral surface diameter of the workpiece and outputs an electrical signal, and the output signal of the sensor is transmitted to the automatic control device. A program which is configured to be input and which controls each of the steps (a) to (e) based on the output signal of the sensor is given to the automatic control device. An apparatus for centerlessly grinding the inner and outer circumferences of the cylindrical member according to claim 22. 26. The work piece is chucked, the work piece is lowered from above the blade, the work piece is loaded to a grinding position supported by the blade and an adjusting grindstone, and the grinding is completed. The inner and outer peripheries of the cylindrical member according to any one of claims 14 to 16, further comprising a conveying means for chucking the workpiece to be ground at the position to be ground and lifting the workpiece to unload it. A device that grinds at the same time.