JPH0222162Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a die head for a cutting machine that holds a cutting tool such as a cutting tool.

A die head (eg, a grooving die head) that holds a cutting tool such as a chaser or a cutting tool generally has a scroll structure so that the tool can be moved back and forth in the radial direction. In other words, a tool is held radially between a pair of annular plates that are rotatable relative to each other, and the scroll action of a scroll-shaped (curved) protrusion provided on the annular plate side and a corresponding curved groove provided on the tool side allows the relative rotation of both plates. The tool can be moved forward and backward in the radial direction in response to rotation.

The present invention relates to a die head of this type, and its purpose is to enable constant and reliable adjustment of the radial protruding position of the tool by means of a simple structure.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The die head according to the present invention has a movable annular plate 1.
1 and a fixed annular plate 13. A guide annular plate 35 is attached to the inner diameter portion of the fixed plate 13 by, for example, bolts 15 or the like. The guide plate 35 is connected to the fixed plate 13 by means of its shoulder 19.
The movable plate 11 is held between the two. As a result, during operation, the movable plate 11 is replaced by the fixed plate 13.
It rotates while being sandwiched between the guide plate 35 and the guide plate 35. A corresponding number of curved projections 36 in the circumferential direction are formed on the movable plate 11 at positions corresponding to the tools 10 such as cutting tools. The tool 10 has a circumferentially curved groove 12 into which the projection 36 is fitted. A scroll mechanism is thus formed between the movable plate 11 and the guide plate 35, and when relative rotation occurs between them, the tool 10 is guided by the protrusion 36 of the movable plate 11 and moves forward or backward in the radial direction. . The attachment position of the tool 10 is adjusted by holding the lever 42 of the movable plate 11 and rotating the fixed plate 13 and the movable plate 11 relative to each other.

Incidentally, reference numeral 50 indicates a mounting hole formed in the fixing plate 13 for fixing the die head main body to, for example, a tool carriage (not shown) of a cutting machine. In addition, 3
3 indicates a positioning member attached to the plate 13 to determine the position of the tip of the pipe 100, and the pipe 100 is fed in the axial direction until the tip comes into contact with the positioning member 33.

The above configuration is a typical conventional die head configuration.

According to the present invention, in the die head as described above, a projecting portion 21 is formed on the outer peripheral portion of the fixing plate 13. This projecting portion 21 has an arc-shaped groove 2.
4 is formed, and the slider 22 is slidably fitted into the groove 24. The slider 22 has a blind hole 26
A cut-up spring 28 is formed in the blind hole 26.
is placed. As a result, the slider 22 is always biased with a rotational force in the counterclockwise direction in FIG. 1 by the cut-up spring 28. The slider 22 is prevented from coming off the groove 24 by a slider presser 8 fixed to the fixed plate 13.

A locking piece 32 is attached to the slider 22 by, for example, a bolt (not shown). Alternatively, the locking piece 32 may be a projection formed integrally with the slider 22. A concave groove 38 is formed in the fixed plate 13 to accommodate the locking piece 32 and permitting the locking piece 32 to move in the circumferential direction together with the slider 22. The locking piece 32 locks the tip of the feed screw shaft 14 . The feed screw shaft 14 is connected to the fixed plate 1
3 and is threadedly supported by a nut member 18 fixed to the base plate 3 by, for example, a bolt (not shown). A handle 6 is attached to the outer end of the feed screw shaft 14 via a handle knob 4. The lock nut 2 is screwed into the feed screw shaft 14 and regulates the amount of feed of the feed screw shaft 14. That is, when the feed screw shaft 14 is rotated by the handle 6, the feed screw shaft 14 engages the locking piece 3 at its tip.
2, but when the lock nut 2 comes into contact with the nut member 18, it can no longer move forward.

Reference numeral 3 designates a positioning notch that is pivotally supported on the slider 22 via a shaft pin 7, and an eccentric pin 5 is rotatably supported on the movable plate 11 in a groove 9 formed in the positioning notch 3. The tip is engaged. As a result, by rotating the eccentric pin 5, the slider 22 or the movable plate 11 is slightly slid in the circumferential direction via the positioning notch 3 due to its eccentric mechanism. That is, the eccentric pin 5
is an operating member for adjusting the protruding position of the tool 10. Therefore, if the amount of eccentricity is set to match one size of the standard groove to be cut into the pipe 100, the depth of the cut groove can be adjusted by one size by simply rotating the eccentric pin 5. If the positioning notch 3 is rotated counterclockwise in FIG. 2 around the shaft pin 7, the engagement between the positioning notch 3 and the eccentric pin 5 will be released, so the movable plate 11 can be attached to the fixed plate 13 as necessary. It can be rotated significantly.

With the above configuration, the plate 11 can be rotated relative to the plate 13 by rotating the handle 6. As a result, the tool 10 is advanced in the radial direction by the required amount, and the cutting edge of the tool 10 can be brought into contact with a workpiece such as the pipe 100.

As described above, according to the present invention, the handle 6
The tool 10 can be easily moved forward and backward in the radial direction by rotating the handle 6, and since the amount of movement of the tool 10 is uniquely determined according to the rotation angle of the handle 6, it is independent of the operator's skill. Tool 10
The amount of movement can be kept constant. The rotation operation of the handle 6 can be performed not only when bringing the tool 10 into contact with the outer periphery of the workpiece 100 at the start of machining, but also for feeding the tool 10 in the radial direction during machining.

Furthermore, since the lock nut regulates the amount of feed of the feed screw shaft, grooves can be cut to the specified depth as many times as desired. The groove depth can be easily adjusted by loosening the handle knob and lock nut and shifting their positions without removing the die head from the carriage or the like.

When returning the cutting tool to the initial position, the feed screw shaft is turned in the opposite direction, and the slider 22 is returned to the initial position by the cut-up spring 28.

[Brief explanation of the drawing]

FIG. 1 is a front view of a die head according to the present invention, and FIG. 2 is a sectional view taken along the line -- in FIG. 6... Handle, 10... Tool, 11... Movable plate, 13... Fixed plate, 14... Feed screw shaft, 22... Slider.

Claims (1)

[Scope of utility model registration request] In a die head of a cutting machine in which a cutting tool is movably held in the radial direction between a pair of relatively rotatable fixed and movable annular plates, a concave structure extending in the circumferential direction is formed in the fixed annular plate; A slider is slidably fitted into the concave structure and connected to the movable plate, and a feed screw shaft is screwed to the fixed plate so that its tip is locked to the slider, and the feed screw is connected to the movable plate. A screw shaft feed amount regulating member is attached to the shaft, the position of which can be adjusted in the axial direction of the screw shaft, and a stop member is provided on the fixed plate to which the screw shaft feed amount regulating member comes into contact, so that the feed screw shaft A die head for a cutting machine, characterized in that a cutting tool can be moved forward and backward in the radial direction by rotating the die head by a predetermined amount.