JPS5825836A - Working method for screwlike object - Google Patents

Abstract

PURPOSE:To form the screw threads of an external screw part and a circular conical part in one stage by preparing a blank material having the circular conical part of the same diameter as that of a circular columnar part to the leading end of a screwed part having the same diameter as that of the external screw part and rolling the material with a die plate rolling machine consisting of a pair of flat dies. CONSTITUTION:A blank material 21 formed with an external screw part 2, a mouth part 4 as a circular columnar part in the leading end part of a screwed part 22 having approximately the same diameter and a circular conical part 23 having approximately the same diameter is prepared. If the material 21 is fitted between the starting end parts 14 of a pair of flat dies 11, 11 of a die plate rolling machine and the moving flat die 11 is moved along the stationary flat die 11, the material 21 rolls from the parts 14 of the dies 11, 11 toward the terminal part 15, and during this time, screw threads 3 are engraved on the outside circumferential side of the part 22 by the projecting lines 16 and groove lines 17 of the thread rolling parts 12 of the dies 11, 11; at the same time, the part 23 is pressed and drawn from the outside whereby a closing part 5 as the circular conical part is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides, for example, an air bleeder screw,
The present invention relates to a method of processing a thread-like article having a conical part at the tip of a male threaded part via a cylindrical part with a slightly smaller diameter.

Conventionally, a thread-like article having a conical part at the tip of a male thread part through a cylindrical part of a slightly smaller diameter, for example, ? When processing the air bleeder screw (1) as shown in Figure 1, the process of forming the thread groove (3) of the male threaded part (2) and the process of forming the thread groove (3) of the male threaded part (2)
The process of forming the conical closure part (5) provided through the cylindrical mouth part (4) with a slightly small diameter at the tip of the is a separate process, and the closure part (5) is formed by cutting. In this case, this alone would take about 10 seconds.

The present invention has been made in view of these points, and when processing a thread-like object such as an air bleeder screw, which has a conical part at the tip of the male thread part through a slightly small diameter cylindrical part, the male thread The threaded part and conical part are formed in one machining process, thereby reducing the number of processes. Prepare a material having a conical part forming part with approximately the same diameter as the cylindrical part, and create a busy thread groove on the outer peripheral side of the threaded part of the material by die plate rolling IK consisting of a pair of flat dies. At the same time, the conical portion is formed by applying pressure and tightening the conical portion forming portion from the outer peripheral side.

Next, the method of the present invention will be specifically explained based on an embodiment shown in the drawings.

Figure 2 shows the air bleeder screw (
This figure shows the flat die (11) of the die plate rolling machine that forms the screw #1l (31) of the male threaded part (2) of 1) and the closed part (5) as a conical part, and this flat die αυ is
It is composed of a thread rolled part 1 and a conical rolled part αj.

On the front surface of the thread-rolled portion (13), there are alternately protrusions αe that increase in height and grooves αη that increase in depth from the starting end αX to the terminal end Q9. The upper conical rolling part αj is provided with a downward slope, and on the front surface of the upper conical rolling part αj, there is a protrusion for cutting which increases in height from the starting end I to the terminal end a9. The upper rising part of this protrusion for cutting, that is, the part where the upper diagonal on the protrusion side intersects with the vertical surface of the front surface of the conical rolled part a3 is formed horizontally. Along with being.

The height of the protrusion H becomes constant when it reaches a predetermined height, and the top of the protrusion Q8 becomes flat near the terminal end α9.

Then, the die plate rolling machine is
As shown in Figure 6, one of a pair of flat dies αυαυ is fixed, and the other flat die αυ is movably opposed to the fixed flat die αυ, and the space between the fixed and movable flat dies a1)09 is The material 01) is clamped under pressure and transferred.

As shown in Figure 3 @, the above material Qυ has a threaded part ■ that has approximately the same diameter as the male threaded part (2) of the air bleeder screw (1), and has a threaded part ■ that has approximately the same diameter as the mouth part (4). A cone-forming portion (toward) formed by forging is prepared.

In this example, the threaded portion is made of the material (2I).

Then, this material Qa is sandwiched between the starting ends (14) of a movable and fixed flat die aυaυ as shown in Figure 3, and then as shown in Figures 4 to 6. , when the movable flat die αD is moved by the fixed flat die α1)K8, the materials Q and D are at the starting end a of each flat die α1)Qυ.
4 toward the terminal end 09, and during this time, a thread groove (3) is carved on the outer circumferential side of the threaded part @ by the protrusion (161) and groove αη of the thread rolled part a3 of each flat die aυαB. At the same time, the conical part formation S (end) is machined from the outer circumferential side by the cutting protrusion QII of the conical rolling part 01 of each flat die αυ011, leaving the mouth part (4) as a cylindrical part. Obstructed part (5) as a conical part that is compressed and squeezed
is formed.

In addition, in this example, after forming the closing part (5),
In order to reliably cut off the surplus part (end) of the conical part forming part (end), one flat die a1), for example, a fixed die a
As shown in Fig. 6, the eastern part (a) protruding from the central axis of the material 60 toward the moving die afi side is integrally attached to the top part 100f near the terminal end a of the center strip 0s for cutting υ. is forming.

Then, the material aD in which the male threaded part (2) and the closed part (5) are formed in this way is connected to the connecting part (c).
Then, as shown in Figure 1, a tapered part (OI) and a groove (to) are formed by cutting to provide a connection part (to),
Furthermore, a ventilation hole (B) is formed by cutting along the central axis from the end face of the connection part (to) to the inside of the mouth part (4), and a ventilation hole (F) is formed from the side of the mouth part (4). The air bleeder screw (1) is completed by cutting an introduction hole communicating with the air bleeder screw (1).

Air bleeder screw manufactured in this way (1)
When compared with the one made by cutting, the blockage part (5
) has a clean surface, so that the air vent hole (43) can be tightly attached to the conical concave fitting part (to) of the attachment target (41), as shown in Figure 1, without the need for finishing. The external threaded part (2) and the closed part (5) have increased surface hardness due to the forging effect of rolling, making the thread groove (3) difficult to collapse, and the closed part (5) The surface becomes less susceptible to scratches.

In this example, the connection part (to) was formed after the thread groove (3) of the male thread part (2) was formed and the closing part (5) was formed, but the connection part (to) was formed. You may choose to do it first.

In addition, the thread rolling part αko and the conical rolling part αj of the flat die αυ
may be formed integrally or separately.

As described above, according to the present invention, when machining a thread-like object having a conical part at the tip of the threaded part through a cylindrical part with a slightly small diameter, the thread groove of the male threaded part and the conical part are formed in one process. If you use a high-speed die plate rolling machine,
This can be formed in 1 to 2 seconds or even less than 1 second, and by simplifying the process and greatly shortening processing time, it is possible to reduce dust and mass production. It also increases the surface hardness, so it is extremely effective when applied to the manufacture of air bleeder screws.

[Brief explanation of the drawing]

Figure 1 is a front view of a cross section of a part of an air bleeder screw as a thread-like object, and Figures 2 to 6 show an embodiment in which the method of the present invention is applied to an air bleeder screw. Figure 2 is a perspective view of the flat die of the Gui plate rolling machine, Figures 6 through 6 each show the processing process, Figure 2 shows the positional relationship of a pair of flat dies, and ■ shows the material at that time. 0 is a cross-sectional view of a pair of flat dies corresponding to the material at that time. (11.e Air bleeder screw as a threaded object,
(2)...Pheasant screw part, (3)...Thread groove, (4)...mouth part as a cylindrical part, (5) Φ/closed part as a conical part,
(11)...Flat die, Qυ...Material, @e thread processing part, (c)...Conical part forming part.

Claims (1)

[Claims] (1) When machining something with a conical part while the tip of the male thread is busy or through a small-diameter cylindrical part, in #C, attach the cylindrical part to the tip of the threaded part that has approximately the same diameter as the threaded part. A material having a conical portion forming portion having approximately the same diameter as the material is prepared, and a thread groove is carved on the outer circumferential side of the threaded portion of the material using a die plate rolling machine consisting of a pair of flat dies, and a conical portion is formed. A method for processing a thread-shaped object, characterized in that the conical part is formed by compressing the conical part from the outer circumferential side.