JPS591140A - Concentric working machine - Google Patents

Abstract

PURPOSE:To enable highly accurate concentric work while employing a general surface grinder in a work machine by constructing such that a rotary holding shaft having a work holding section enable of center adjustment at the end is mounted at the bearing section rotatably. CONSTITUTION:When performing concentric work of a hole in a workpiece 1 and the outercircumference with reference to the micro hole having diameter smaller than 1mm. in a pipe workpiece while employing a surface grinder, a four point supporting bearing 31 integral with the base 30 is mounted on the table 33 of the surface grinder to be in parallel with the rotary shaft of a grindstone 32. While rotating the rotary holding shaft 36, the grindstone 32 will cut into the workpiece 1 in the radial direction from above with several mum step to grind the outercircumference of the workpiece 1, then the portion of the workpiece 1 at the outside of the maximum eccentric section is grinded to remove the deflected portion to make the hole 2 in the workpiece 1 and the outercircumference concentric. Consequently highly accurate concentric work is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a surface grinder to grind the outer periphery of a pipe-shaped workpiece using a small diameter hole as a reference, thereby performing concentric machining of the hole and outer periphery of the workpiece. The present invention relates to a concentric processing machine for processing small-diameter pipes, etc.

Generally, when concentrically machining a pipe-shaped workpiece, as shown in a side view in FIG. 1, the eccentric portion 3 at the outer circumference is removed with reference to the hole 2 of the workpiece 1.

An example of a conventional concentric processing machine will be explained using conceptual diagrams shown in FIGS. 2, 3, and 4.

Figure 2 shows a hole-based concentric processing machine using a cylindrical grinder. A pair of centers 5 are used to support the hole 2 of the pipe-shaped workpiece 1 at the part 4, and the workpiece 1 is
A grindstone 6 performs cylindrical grinding on the outer periphery of the wheel. This device has the disadvantage that it cannot be applied to concentric machining of workpieces 1 with small diameter holes because the center 5 cannot support workpieces 1 with hole diameters of 1 mm or less.

FIG. 3 is an example of a concentric turning machine. .・<Hold the ebb-shaped workpiece 1 on the work head 8 with the collet chuck 7, and monitor Tv1 from the A side via the ITV camera 9.
0, the hole 2 is enlarged and observed, and the position adjustment mechanism 12 of the work head 8 is operated so that the spindle center 11 and the center of the hole 2 coincide. Thereafter, the main shaft 13 is rotated, and the outer circumferential portion of the workpiece 1 is cut using two cutting tools 14 attached to the main shaft 13 to perform concentric machining. However, with this machine, since the hole 2 is observed under magnification, concentric machining is possible even with a pipe with a small diameter hole, but since cutting is performed using the cutting tool 14, the machined surface roughness is as large as 2 μmnmax on average, and the workpiece 1, the position of the work head 8 is adjusted, and then the cutting process is started.The position adjustment and cutting process are always required to be repeated, resulting in poor production efficiency.

Figure 4 shows an example of concentric machining using a cylindrical grinder that can perform concentric machining even on pipes with small diameter holes.

The pipe-shaped workpiece 1 is held by a four-jaw lock 16 that can be held eccentrically with respect to the spindle rotation center 11.1. , I.T.
While observing the hole 2 under magnification on the monitor TV 10 through the V-camera 12, after aligning the rotation center 11 of the spindle with the center of the hole 2, the outer periphery of the workpiece 1 is cut into a cylinder by the grindstone 6 in a cantilevered manner. This is a method of grinding and concentrically machining the hole 2 and the outer periphery of the pipe-shaped workpiece 1. In this device as well, the production efficiency is poor because the workpiece 1 is attached to the processing machine and then position adjustment and grinding are performed.

As mentioned above, conventional concentric processing machines have the disadvantage that concentric processing is not possible when the hole in a pipe-shaped workpiece is small, or that production efficiency is poor even if concentric processing is possible. there were.

Therefore, in the present invention, the hole diameter of the pipe-shaped workpiece is 1 m.
The purpose of the present invention is to provide a concentric machining machine that can perform concentric machining with high production efficiency even in the case of micro holes of less than m in size, and that enables highly accurate concentric machining using a general-purpose surface grinder as the machining machine. shall be.

To this end, in the present invention, a rotating holding shaft having a workpiece holding part at the end that can adjust the axis with respect to the workpiece is placed on a bearing part having a 7-shaped groove and rotated. Ori,
With this configuration, it is possible to process workpieces with micro holes, and furthermore, by removing only the rotation holding shaft,
This makes it possible to perform the grinding process and the process of adjusting the axis of the workpiece independently, resulting in high production efficiency.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 6 is an overall configuration diagram of an embodiment of the present invention.

A four-point support bearing 31 integrated with a base 30 is a grindstone 32
A plane parallel to the 0-rotation axis (Table 3 of the υf cutting machine)
It is placed above 3.

A pipe-shaped workpiece 1 having a small diameter hole 2 held by a pair of V-blocks 34 is fixed to the V-block 3 by an adjusting screw 36.
The position of each shaft 4 is adjusted on the end face of the shaft 36 (rotation holding shaft) so that the center of rotation of the shaft 36 coincides with the center of its own hole, and is fixed with a screw 37. This shaft 36 is attached to the four-point support bearing 31 described in 10 with the belt 38. It is mounted via a pulley 39 and rotated by a motor 40 in the direction of the arrow. Here, while rotating the shaft 36, the grindstone 32 is used to grind 9 grooves from above in the radial direction of the workpiece 1 in steps of several μm to perform 4i1F cutting of the outer circumference of the workpiece 1. 4 on the outer periphery from the maximum eccentric part of 1
As ill cutting progresses, the flared portion 3 shown in FIG. 1 is removed, and the hole 2 of the workpiece 1 and the outer periphery become concentric.

Figure 6a is a structural diagram of the four-point support bearing 31;
It is a side view from the entrance direction of figure B.

In the four-point support bearing 31, the pressure receiving surface 41 has a structure of two V-blocks 42. The shaft 36 and the four-point support bearing 31 are 4
Since there is complete line contact at some points, the theoretical shaft runout is
The machining accuracy is only 6, making it possible to rotate with very little runout. Furthermore, since the shaft 36 is pressed against the pressure receiving surface 41 by a belt or the like, it can be freely removed from and attached to the bearing 31, unlike the case where a rolling bearing or the like is used.

The material of the four-point support bearing 31 is a wear-resistant, large glue such as cemented carbide, hardened steel, ruby, or diamond. In addition, the four-point support bearing 31 does not have to be an integral structure as shown in FIGS. 6a and 6b, but only needs to have a two-V block configuration as a whole, so the tip has a high wear resistance as shown in FIG. 7a. A configuration in which the shaft 36 is supported by disposing the screw 43 made of synthetic fiber Fl in the holder 44 at 900, or a configuration in which only the pressure receiving portion 45 is made of a highly wear-resistant phase H as shown in FIG. 7 is also conceivable.

FIG. 8 shows the structure for holding the workpiece.

The workpiece 1 is held between a pair of V blocks 34, and by tightening the screws 46, the V blocks 34 are brought close to each other and fixed. In this case, since the V groove is machined perpendicularly to the bottom surface B of the V block, the workpiece 1 is held perpendicularly to the bottom surface B of the V block. 47Fi is a hole for fixing to the shaft 36 in FIG. 5, and a male screw (not shown) is inserted into this hole 47 and tightened to a female screw formed on the shaft 36 side.

In this embodiment, a pair of V-blocks are used to hold the liquid-added object, but a precision collet chuck may also be used.

FIG. 9 shows a structure for aligning the center of the small diameter hole of the workpiece 1 with the rotation center of the shaft 36.

The shaft 36 has a hole drilled on the side C that fixes the V block.
Install screws 35 at four evenly spaced positions around the circumference of the hole boring part.
is located. Insert the liquid additive 1 integrated with the V-block 34 shown in FIG. 8 into this bored part as shown in FIG. Monitor through TV49
Enlarge and observe the hole 2 of the workpiece 1 with , move the screw 36 so that there is no deflection in the hole, and move the block 34 to match the center of the hole of the workpiece 1 with the center of rotation of the axis 3θ. After that, the V block 34 is fixed to the shaft 36 with the screw 37.

In this embodiment, a four-point support bearing 31 is used to support the shaft 36.
Because of the rotation of 36 can be freely removed from the four-point support bearing 31.

Further, even if the shaft 36 is reattached, the state will be exactly as before, so that the center of rotation of the shaft 36 and the center of the hole 2 of the workpiece will not be misaligned due to replacement of the shaft 36. Therefore, if the work of aligning the center of rotation of the shaft 36 with the center of the hole 2 of the workpiece 1 is performed on separate bearings of the same type, the position adjustment work can be performed completely independently of the grinding work, and the grinding work can be performed completely independently of the grinding work. Add liquid to all
[This can be done simply by attaching the shaft 36 on which the position of the object 1 has been adjusted onto the four-point support bearing 31 fixed to the table 33 of the surface grinder. That is, since the position adjustment work of the shaft 36 and the liquid addition object 1 and the grinding work can be performed separately in parallel,
Compared to the conventional method of repeating both operations sequentially, production efficiency is dramatically improved.

As explained above, according to the present invention, a rotation holding shaft having a workpiece holding part at the end that can adjust the axis with respect to the workpiece is inserted into the figure 7 groove of the bearing part having the figure 7 groove. Since the workpiece is placed on the machine, the workpiece is no longer held from both ends of the hole, and even liquid-added C objects with minute holes can be held sufficiently and grinding is possible. Since the shaft can be easily attached to and removed from the bearing, it is possible to remove only the rotation holding shaft and adjust the axial center between the workpiece and the rotation holding shaft separately from the grinding operation. Since it can be done in a single process, extremely high production and efficiency can be achieved when grinding a large number of workpieces.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of concentric processing, Figs. 2 to 4 are schematic configuration diagrams showing a conventional concentric processing machine, and Fig. 5 is a schematic perspective view showing a concentric processing machine in an embodiment of the present invention. , Figure 6 (
IL), (b) is a structural perspective view and side view of the bearing part,
Figures 7 (IL) and (b) are side views showing other embodiments of the bearing section, Figures 8 and 9 are perspective views of main parts showing the rotation holding shaft, and Figure 10 is the axis of the rotation holding shaft. It is an explanatory diagram of cardiac adjustment work. 1... Workpiece, 2... Hole 1.3o.
・m Heath, 31...4-point support bearing, 32...
...Whetstone, 33...River table, 34...
・V block, 35・Old adjustment screw, 36...
・Rotation holding shaft, 37... Screw, 38...
・Belt, 39...Curved pulley, 40...Motor, 41...Pressure receiving part, 42...V block, 46...Nel,, 47... ...hole, 48
...I TV camera, 49...Monitor TV0 Name of agent Patent attorney Masao Nakao Haga 1st person
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 ((11/mu) Figure 7 (Q ) /A) Leg 8, 5+4 Figure 9 Figure 10 d

Claims (4)

[Claims] (1) A rotational holding shaft having a workpiece holding part at an end that can adjust the axis with respect to the workpiece, a bearing part having a V-shaped groove in which the rotational holding shaft is placed, and the rotational holding shaft. A concentric processing machine comprising: a drive section that rotates a shaft; and a rotary grinding section that grinds the workpiece, the rotary shaft being arranged so as to be parallel to the ifI rotation holding shaft. (2) The concentric processing machine according to claim 1, wherein the rotation holding shaft contacts the V-shaped groove of the bearing portion at four locations. (3) The workpiece holding section consists of two V-shaped blocks in which V-shaped grooves are formed to hold the workpiece, and a mounting section on which the V-shaped blocks are mounted movably. A concentric processing machine according to claim 1, characterized in that: (4) The concentric processing machine according to claim 3, wherein the mounting portion is a concave body, and movable part sets are provided at a plurality of locations on the peripheral wall of the ■-shaped body.