JP3233656B2 - Screw hole processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a method for machining a screw hole mounted on a machine, a tool, or the like by using a tap for thread cutting or rolling.

[0002]

2. Description of the Related Art Conventionally, as a processing method of this kind, usually, a tapping tap having a blade surface for plastic working in a longitudinal direction on a peripheral surface, a longitudinal groove on a peripheral surface, and a blade surface on an outer peripheral surface is usually used. The process of rolling or cutting the circular hole on the workpiece member side to form a screw surface using a cutting tap having the above configuration.

[0003] However, in such a method, in the case of machining in a long hole or the like, simply by cutting or rolling in a circular hole due to the shape of the tap, particularly by manual operation. When tapping, tapping can cause the screw surface to be inclined or eccentric due to the fall of the tap, or the tap itself is liable to break (this tendency is particularly remarkable when processing a curved surface or a tapered surface). There has been such a problem that the forming speed and the cutting speed have to be reduced and the workability is impaired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. Even when a long hole or the like is used, the present invention is particularly suitable for machining a curved surface or a tapered surface. In addition, in addition to eliminating the inclination and eccentricity on the screw surface, preventing breakage of the tap itself, thread hole processing that can increase the rolling speed and cutting speed and improve workability
It is intended to propose a method .

[0005]

Means for Solving the Problems] To achieve the above object the present invention includes a plurality of grooves in the longitudinal direction of the outer circumferential surface (2), the rotation direction front side of the blade surface of the side of the concave groove (3 ) (1 ′)
In the method of processing a screw hole with a tap consisting of
At the distal end of the shaft (1 '), there is provided an engagement hole (4) which is concentric for insertion of a separate guide body (6) and has a depth shorter than the axial length of the blade surface (3). The work (5) on which the engagement hole (4) portion of the tap is machined by the tap (1) is formed by the circular hole (5 ′) on the member side.
) Be those processing the threaded surface on the bore peripheral surface of the adherend engagement with a circular hole (5 ') to the guide body (6) of the separate internal to disposed in concentrically columnar or cylindrical And the engagement hole of the tap
(4) is engaged with the guide body (6) in a predetermined number of peaks.
After threading, remove the guide body (6)
Screw hole machining method, characterized in that threading is performed
It is the gist.

[0006]

Since the present invention is based on such a method for forming a screw hole, the tap side is engaged with the separate guide body portion even when it is processed by a manual operation. Hardly any tilting or runout of the core, so that even in a long hole or the like, inclination and eccentricity on the screw surface can be eliminated, and at the same time, breakage of the tap itself is prevented. The workability can be improved by increasing the cutting speed. In particular, even when a screw hole is formed on a curved surface or a tapered surface where inclination or eccentricity is likely to occur, a screw surface with high accuracy such as concentricity and parallelism can be formed.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a partially cut-out state of a screw hole according to the present invention; FIG. FIG. 1 corresponds to FIG. 1 in a machining state according to an example, FIG. 3 is a diagram corresponding to FIG. 1 showing machining to a curved surface, and FIG. 4 is a diagram equivalent to FIG. 1 showing machining to a tapered surface. As shown in detail in FIG. 2, the outer peripheral surface has a plurality of grooves (2) in the longitudinal direction for the escape of cutting powder, and the front side in the rotational direction of the side surface of the grooves (2) is None the blade surface (3), and the blade at the same core distally
It is formed by a shaft body (1 ') having a depth shorter than the axial length of the surface (3) and having an engagement hole (4) formed of a smooth inner surface. Reference numeral (5) denotes a work member, which is provided with a circular hole (5 ') by a drill or the like in advance, and a columnar shape (see FIG. 1) or a cylindrical shape (see FIG. 2) in the engaging hole (4). ), Insert a separate guide body (6) so as to protrude, and in this state, thread about 3 to 5 threads around the hole of the circular hole (5 '), and then separate guide body (6). Is removed and the remaining screw holes are formed while pressing the tap (1). Circular hole
At the time of rolling (see Fig. 1) or cutting (see Fig. 2) at (5 '), the engaging hole (4) on the tap (1) side should be
The screw hole in the circular hole (5 ′) is inserted into the guide body while being engaged with the separate guide body (6) disposed in the section (5 ′).
(6) It is also possible to process while moving down.

FIG. 3 is a view showing the processing of a screw hole in a curved surface, and FIG. 4 is a view showing the processing of a screw hole in a tapered surface. Inclination and eccentricity are prevented.

[0009]

As described above, in the method of processing a screw hole using a tap according to the present invention, a concentric engagement hole (4) is provided on the tip end side even when processing a curved surface or a tapered surface. The tapping (1) is made plastically or by cutting with the attached state to the guide body (6) protruding from the circular hole (5 ') side of the work member (5) side. Dimensional circular hole
Even in the case of (5 '), to prevent the concentricity by removing the inclination or eccentricity of a screw surface, the accuracy of the parallelism and the like rather high, or the tap (1) breakage of itself, Ya further rolling speed This is extremely useful, for example, the workability can be improved by increasing the cutting speed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway longitudinal sectional view in a processing state by a screw hole processing method.

FIG. 2 is a view corresponding to FIG. 1 in a working state according to another embodiment.

FIG. 3 is a view corresponding to FIG. 1 showing thread hole processing on a curved surface according to the present invention.

FIG. 4 is a view corresponding to FIG. 1 showing thread hole processing on a tapered surface.

[Explanation of symbols]

 Reference Signs List 1 tap 2 concave groove 3 blade surface 4 engagement hole 5 work member 5 'circular hole 6 guide body

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 55-55327 (JP, U) Technical Skills Friend Editing Section "Skill Books (5) / Threaded Majin" 5th Edition (53.3. 1) Page 104-Page 105 (58) Fields investigated (Int. Cl. ⁷ , DB name) B23G 5/06

Claims (1)

(57) [Claims] 1. A plurality of grooves (2) in a longitudinal direction of an outer peripheral surface;
A shaft body having a blade surface (3) on the front side in the rotational direction of the side surface of the groove.
In the method of processing a screw hole by a tap made of (1 ′), a separate guide body is provided on the tip end side of the shaft body (1 ′).
(6) The tap (1) provided with an engagement hole (4) having a depth that is shorter than the axial length of the blade surface (3) and is coaxial for insertion, and the engagement hole (4) portion of the tap is provided. The workpiece (5) to be machined is attached to and engaged with a cylindrical or cylindrical guide body (6) disposed concentrically inside the circular hole (5 ') on the member side. 5 ') The threaded surface is machined on the peripheral surface of the hole, and a predetermined number of threads are machined while the engaging hole (4) of the tap is engaged with the guide body (6). And removing the guide body (6) and performing the remaining screw processing.