JPS5841050Y2 - Knurling tool - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a knurling tool.

When knurling is performed by attaching the workpiece to a lathe and rotating it, and pressing a tool fixed to the tool rest against the workpiece,
Conventionally, as shown in Fig. 1, a tool 2 with a pair of pieces 1 attached rotatably adjacent to each other was used to press the workpiece W from the side in the direction of the arrow, which caused a bending load to be applied to the workpiece W. ,
During machining, the workpiece W was bent and bent, resulting in not only a poorly finished machined surface, but also the workpiece W being bent.

On the other hand, the machined surface can be finished neatly by attaching the tool at a slight angle to the feed direction and machining it, but the method of attaching the tool relies on the skill of the on-site worker. Therefore, the actual situation was that there were differences in the finished surface depending on the operator.

The present invention eliminates the drawbacks of the conventional knurling process by pressing the piece against the workpiece from below the road, attaching the piece to the holder body with a slight inclination to the feed direction, and pressing the button. An embodiment of the present invention will now be described in detail with reference to the drawings.

FIG. 2 is a front view of a knurling tool embodying the present invention, FIG. 3 is a side view thereof, and FIG. 4 is a bottom view thereof.

As shown in the figure, a pair of pieces 3 and 3' are rotatably attached to mounting shafts 4 and 4', respectively, and the mounting shafts 4 and 4' are respectively fixed to the tips of rectangular parallelepiped piece holders 5 and 5'. It is fixed by screws 6.6'.

The piece holder 5゜5' is attached to both ends of the holder main body 1 having a semicircular bent shape with one side open so that the pieces 3 and 3' are slidable in the longitudinal direction, respectively, facing each other.
They are fixed to the holder main body 7 by washers 8, 8' and poles 9 and 9', respectively.

That is, grooves are provided at both ends of the holder body 7, and the piece holders 5 and 5' are fitted into the grooves so as to be able to slide along the grooves. A long hole 5a*5a' is provided in the direction, and bolts 9, 9' are inserted into the long hole 5a*5a', and the washer 8
, 8', the piece holder 5.degree. 5' is pressed onto the holder main body 1 at an arbitrary position and fixed thereto.

Further, a mounting shank 10 having a rectangular cross section is attached to the center of the holder body 7 by a pin 11 so as to be rotatable by a predetermined angle within a plane including both ends of the holder body 7.

That is, a recess is formed in the central part of the holder main body T on the front and back surfaces, and the tip of the mounting shank 10 is made into a forked shape, and the fork is fitted into both the recesses, and the two are connected with the pin 11. ing.

Here, the width of the concave portion of the holder body I is made slightly larger than the width of the mounting shank 10, and a small gap 12 is provided between the two.
The holder main body I can be rotated by a slight angle about a pin 11 with respect to a mounting shank 10.

On the other hand, as shown in FIG. 3, the piece holders 5 and 5' are attached to the holder body 7 at an angle of a slight angle α, and are attached to the holder body 7 in a direction perpendicular to the plane indicated by the arrow in FIG. The mounting shafts 4, 4' of the top 3g3' are tilted at an angle α in opposite directions.

In the figure, the upper piece holder 5 is moved clockwise from the vertical position centering on the bolt 9 position, and the lower piece holder 5
' is inclined counterclockwise from the vertical position with the bolt 9' as the center.

In this example, α is set to 2°. As shown in Fig. 2, the method of using the proposed tool is as follows: 1. Place the piece holders 5, 5 in accordance with the outer diameter of the workpiece W so that the pieces 3, 3' hit the workpiece W from below the road. Adjust the amount of protrusion of ', and
, 9' fix the frame holders 5, 5'.

Next, as in conventional knurling, while rotating the workpiece W, move the entire tool to the workpiece Wllll, press the piece 3.3', and feed in the feed direction shown in Figure 3. Perform knurling.

As described above, according to the present invention, since the pieces are pressed from below on the road, the load is not concentrated in the lateral direction, and therefore bending loads that have an adverse effect on the workpiece can be prevented, and the pieces are pressed against the road from below. Coupled with the fact that it is attached to the holder body at an angle in advance, a large load can be easily applied at one time, and work efficiency can be improved.

Furthermore, with the present invention, one side of the holder body is open and the tool can be applied to the workpiece from the side through the opening, making it convenient to use. Since it is mounted so that it can rotate, deviations in the center axis of the workpiece can be absorbed with a simple structure.

In addition, since the top is attached to the holder body in advance at an angle that is tilted to the optimum angle, the top can be applied to the workpiece at the optimum angle by simply setting the holder body straight on the tool rest of the lathe. Therefore, the machined surface can be finished neatly without leaving any residue without relying on the skill of the operator.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of conventional knurling, FIG. 2 is a front view of a knurling tool embodying the present invention, FIG. 3 is a side view thereof, and FIG. 4 is a bottom view thereof. 3.3'...Column, 4,4'...Mounting shaft, 5゜5'...Column holder, 1...
Holder body, 10...Mounting shank, 11...
····pin.

Claims (1)

[Scope of utility model registration request] A mounting shank is attached to the center of the holder body, which has a bent shape with one end open, using a pin so that it can be rotated by a predetermined angle within a plane that includes both ends of the holder body. A pair of top holders each having a top rotatably attached thereto, the mounting axes of both tops are tilted at the same minute angle in opposite directions with respect to a direction orthogonal to the plane, and the tops face each other. A knurling tool characterized by being installed so that the opposing distance between pieces can be changed.