JPS596965Y2 - positioning jig - Google Patents

Description

[Detailed description of the invention] This invention uses a spherical cutting tool in lathe processing.
The present invention relates to a fixture for positioning a spherical cutting tool relative to a workpiece when performing arbitrary spherical processing.

Conventionally, when machining a spherical surface on the tip of a workpiece as shown in Figure 1 using a spherical cutting tool on a lathe, the operator visually rotates the cutting tool with the desired shape. Processing was performed by aligning the parts using the axis as a reference, performing trial processing, measuring and inspecting, and repeating this process several times until the desired shape was achieved.

However, with this method, it is extremely difficult to position the cutting tool, and the process of trial machining and measurement/inspection is repeated multiple times, resulting in wasted material and extremely long manufacturing times.

The purpose of the present invention is to improve such drawbacks, to facilitate positioning of a cutting tool during spherical machining, and to perform spherical machining in a short time without trial machining.

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

FIG. 1 is a diagram showing the shape of a machined part of a mechanical component machined according to the present invention.

FIG. 2 is a diagram showing the structure of an embodiment of the present invention, in which a is a front sectional view, b is a right side view, and C is a view taken along the line H--H in a.

FIG. 3 is a sectional view showing the positioning shaft tip and the spherical cutting tool on a plane including the central axis X--X shown in FIG. 2a, and is a diagram showing the positioning state.

In FIG. 1, reference numeral 1 denotes a cylindrical mechanical part with a diameter of 20 mm, which is an object to be cut, and its tip is machined into a spherical surface with a radius of 10 mm by a cutting tool positioned using the jig of the present invention.

In Figure 2a, 2 is the main shaft, and L has a rectangular hole 3.
A shaped bearing fitting 4 is fixed.

A rectangular hole 3 is bored in the L-shaped bearing fitting 4, and the inner surface E of the hole 3 is parallel to the outer surface D of the L-shaped bearing fitting 4.

Reference numeral 5 denotes a positioning shaft, which is composed of a slide shaft section 6 and a semi-conical tip section 7.

The slide shaft part 6 has an external diameter of a male screw having an arbitrary pitch and has the same dimensions as the rectangular hole 3 of the L-shaped bearing fitting 4, and slides in the rectangular hole 3 by a nut 8 without rotating.

The semi-conical tip 7 has a surface cut along a plane including the central axis XX of the main shaft 2 and the central axis Y-Y of the slide shaft 6.

In this embodiment, the slide shaft 6 of the positioning shaft 5 has a screw pitch of 1 mm, and slides by 1 mm when the nut 8 is rotated once.

Furthermore, the semi-conical shape of the tip 7 has a 1/2 taper and has a length of 30 mm.
mm, so when the nut 8 is rotated once, the center axis X-X
The radius of the cone at the top changes by 0.5 mm.

The tip of the semi-conical tip 7 is aligned with the center axis X-X by the nut 8.
If the cone is located at the top and the radius R at this time is Omm, the radius R of the cone can be varied up to 15 mm by rotating the nut 8.

This semi-conical tip 7 can be formed into any desired semi-conical shape depending on the processing purpose.

Reference numeral 9 is fixed to the L-shaped bearing fitting 4 with a spring, and is provided for the purpose of eliminating backlash between the slide shaft portion 6 and the nut 8.

Use this jig to position the cutting tool, and
When machining a spherical surface with a radius of 10 mm as shown in the figure, turn the nut 8 20 times to set the radius R of the semi-conical tip 7 to 10 mm on the central axis XX shown in Figure 2 a. do.

Next, insert the main shaft 2 of the precision positioning jig set in this way into the collet chuck 10, press the dial gauge against the D surface of the L-shaped bearing fitting 4, and position it parallel to the central axis Y-Y. Adjust accordingly.

In this state, the main shaft 2 is fixed by the collet chuck 10.

FIG. 3 is a diagram showing a state in which the spherical cutting tool 11 is aligned with the semi-conical tip 7 on a plane including the central axis XX in FIG. 2a.

The position is determined by observing the gap between point P of the semi-conical portion 7 and the end of the R curved surface of the spherical cutting tool 11 that has been ground into the desired shape, and the spherical cutting tool 11 is fixed.

In this case, the point P is the spherical part of the semi-conical part 7, the central axis XX of the main shaft 2, and the central axis Y-Y of the slide shaft 6 shown in FIG. 2a.
is the intersection with the plane containing .

In this way, the spherical cutting tool 11 is aligned.

Finally, the positioning jig is removed from the collet chuck 10, the object to be turned is attached to the collet chuck 10, and lathe processing is performed.

As described above, as an embodiment of the present invention, an example was shown in which a cylindrical workpiece is machined into a spherical surface, but any workpiece can be easily machined into a spherical surface.

As described above, according to the present invention, it is possible to accurately position a spherical cutting tool with an arbitrary radius R using an extremely simple mechanism, and since trial machining is not required, not only can machining be performed in a short time, This is extremely beneficial as it eliminates wasted materials.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a cylindrical workpiece with a spherical tip machined using an embodiment of the present invention, and FIG. 2 is a diagram showing the structure of an embodiment of the present invention. A front sectional view, b is a right side view, and C is a view taken along the line H-H shown in a. FIG. 3 is a sectional view showing the semi-conical tip and the spherical cutting tool on a plane including the central axis X--X shown in FIG. 2a, showing the state at the time of positioning. In the figure, 1 is the workpiece, 2 is the main shaft, 3 is a rectangular hole, 4 is an L-shaped bearing, 5 is a positioning shaft, 6 is a slide shaft, 7 is a semi-conical tip, and 8 is a rectangular hole. Nut, 9 is spring, 1
0 represents a collet chuck, and 11 represents a spherical cutting tool.

Claims (1)

[Scope of utility model registration request] The shape of the tip of the positioning shaft, which is supported at right angles to the main shaft by an L-shaped bearing fitting fixed to one end of the main shaft fixed to the collet chuck of the lathe, is similar to the central axis of the main shaft and the positioning shaft itself. a semi-conical shape having a surface cut by a plane including the central axis, and the semi-conical part is located on an extension of one end of the main shaft, and the positioning shaft is attached to the L-shaped bearing fitting. A positioning jig, characterized in that the positioning jig is configured to pass through the intersection of the main shaft and the positioning shaft without rotating in a bearing provided therein, and to slide in the radial direction of the main shaft.