JPH06328318A - Ridge deburring method - Google Patents

Abstract

PURPOSE:To deburr a ridge without enlarging a screw cutting, and using manual operation or an exclusive deburring device. CONSTITUTION:Screw rough working is applied to a steel pipe 1 by the screw rough working part 41 of the cutting blade 4a of a screw rough working tool by rotating the screw rough working tool and a screw cutting working tool in the peripheral direction of the steel pipe 1. Next, screw cutting working is applied to the steel pipe 1 by the cutting blade 6a of the screw cutting working tool, and then deburring working is applied to a burr 3 produced on the ridge 2 of the steel pipe 1 at the time of the screw cutting working by the deburring working part 42 of the cutting blade 4a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removes burrs on a thread formed around a fixed steel pipe when a tool having a cutting blade is rotated to thread the end of the steel pipe. It is about the method for.

[0002]

2. Description of the Related Art A male screw (hereinafter referred to as "
As a device for forming a “screw”, the end of the steel pipe is threaded around the fixed steel pipe by rotating an unscrewed roughing tool equipped with a cutting blade and a threading tool. A scraping screw machine (hereinafter referred to as "screw machine") is known.

FIG. 1 is a schematic side view showing a thread cutting machine, and FIG.
FIG. 3 is a side view showing a screw-under rough machining tool and a thread cutting machining tool attached to a thread cutting machine.

In FIG. 1, 7 is a rotating body, and 5 is a rotating body 7.
A holder provided at the tip of 4 is a tool for roughing under screw, and 6 is a tool for thread cutting. Each of the under-screw rough-edging tool 4 and the thread-cutting tool 6 has a holder 5
Is attached to the rotating body 7.

As shown in FIG. 2, a screw bottom roughing tool 4
Is equipped with a cutting blade 4a for roughing under-screw the steel pipe 1 to be cut (hereinafter referred to as "steel pipe"), and the threading tool 6 is a cutting tool for threading the steel pipe 1. It has a blade 6a. The under-screw rough-working tool 4 and the thread-cutting tool 6 are respectively arranged at four positions in the circumferential direction of the steel pipe 1 so as to surround the steel pipe 1.

The rotating body 7 rotates and the fixed steel pipe 1 is surrounded by a tool 4 for screw rough machining and a tool 6 for thread cutting.
Rotates. By sending the under-screw roughing tool 4 and the thread-cutting tool 6 from the tip of the steel pipe 1 toward the central portion, the under-screw roughing tool 4 performs the screw-down rough machining from the tip of the steel pipe 1, Immediately after that, thread cutting is performed by the thread cutting tool 6. 2 indicates a screw thread.

When the steel pipe 1 is thread-cut by the above-mentioned screw cutting machine, burrs 3 are formed on the threads of the steel pipe, particularly on the bevel of the threads 2 of the steel pipe 1, as shown in FIG.

In order to remove the burrs generated in the thread of the steel pipe, a deburring processing tool dedicated to deburring processing is provided in the threading machine in addition to the above-described under-screw roughing tool and threading processing tool. There has been proposed a method of removing burrs on a screw thread by using a tool for mounting and deburring.

[0009]

However, in order to attach the three tools of the under-screw rough machining tool, the thread cutting machining tool and the burr removal machining tool to the thread cutting machine, the holder for mounting these tools must be large. It has to be done, and the threading machine itself needs to be enlarged accordingly.

Further, in order to prevent the deburring tool from interfering with the threads during thread cutting, it is necessary to make the distance between the thread cutting tool and the Paris removing tool larger than before. For this reason, the stroke of the tool must be larger than before. For this reason, the price of the thread cutting machine itself becomes high.

Further, in a threading machine for small diameter steel pipes, since the mounting space is limited by the size of the holder, it is difficult to mount the deburring tool in the first place.

For this reason, conventionally, when the deburring is carried out manually or by removing the threaded steel pipe from the threading machine and then using a dedicated deburring device or the like. Was the most.

Therefore, an object of the present invention is to provide a method capable of removing burrs from a screw thread without increasing the size of a thread cutting machine and without using manual work or a dedicated deburring device. It is in.

[0014]

According to the method of the present invention, a cutting blade of an under-screw roughing tool is formed into a shape including an under-screw roughing portion and a burr removal processing portion, and surrounds a fixed steel pipe. As described above, the screw roughing tool and the thread cutting tool are arranged on a rotating body, and then the rotating body is rotated by the rotating body in the circumferential direction of the steel pipe. Then, the steel pipe is threaded by the screw thread roughing portion of the cutting blade of the screw thread roughing tool, and then the steel tube is threaded by the thread cutting tool. Strain, then
It is characterized in that the deburring processing portion of the cutting blade of the under-screw roughing tool performs deburring processing on the thread of the steel pipe.

[0015]

[Function] The cutting blade of the under-screw roughing tool is formed into a shape that can be used for both under-screw roughing and deburring. Attach the screw roughing tool and thread cutting tool to the holder. The steel pipe inserted in the holder is first subjected to screw-down rough machining with a screw-down roughing tool, and then to the steel pipe subjected to screw-down rough machining with a thread-cutting tool. The steel pipe that has been subjected to the threading process and then subjected to the threading process is subjected to deburring process by a tool for roughing under screw. Thus, after the thread cutting process, the burr removal process can be performed without removing the steel pipe from the thread cutting machine, and the work efficiency is significantly increased.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be described below with reference to the embodiments shown in the drawings. FIG. 7 is a side view showing one embodiment of a cutting blade of a tool for roughing under screw for carrying out the method of the present invention, and FIG. 8 is a partially enlarged view of FIG.

As shown in FIGS. 7 and 8, the cutting blade 4a of the unscrew roughing tool 4 has a screw unscrew roughing portion 41 for performing unscrew roughing and deburring for performing deburring. The processing section 42 is provided. The burr removal processing portion 42 is a notch-shaped portion provided in the vicinity of the screw bottom rough processing portion 41. The cutting blade 4a of such a dual-purpose tool is
The cutting blade of the conventional unscrew roughing tool including 41 is different from the cutting blade of the conventional unscrew roughing tool only in that the notch is further provided. The under-screw rough processing portion 41 and the burr removal processing portion 42 are provided at both end portions of the diagonal line.

Next, the steps for removing the burrs of the thread by the method of the present invention using the under-screw roughing tool having the cutting blade thus constructed will be described with reference to FIGS. 1 to 8.

As shown in FIGS. 7 and 8, the cutting blade 4 a of the unscrew roughing tool 4 is prepared to have a shape including the unscrew roughing portion 41 and the deburring portion 42.

Next, as shown in FIGS. 1 and 2, the unscrewed roughing tool 4 and the threading tool 6 are arranged on the rotating body 7 via the holder 5 so as to surround the fixed steel pipe 1. .

Next, as shown in FIG. 3 and FIG. 4, the under screw rough machining tool 4 and the thread cutting work tool 6 are rotated in the circumferential direction of the steel pipe 1 by the rotating body 7, and the under screw rough machining tool 4 is rotated. And the tool 6 for thread cutting is sent from the tip of the steel pipe 1 to the central part. As a result, the steel pipe 1 is roughly screwed by the screw thread roughing part 41 of the cutting blade 4a.
Immediately after that, the steel pipe 1 is threaded by the cutting blade 6a of the threading tool 6.

Next, as shown in FIG. 5, the under-screw roughing tool 4 and the thread cutting tool 6 that have been machined are separated from the thread 2 and returned to the tip of the steel pipe 1.

Next, as shown in FIG. 6, the deburring portion 42 of the tool 4 for under-screw roughing is processed into the thread 2 of the steel pipe 1.
The position of the burr 3 generated on the bevel is adjusted so that the under-screw roughing tool 4 together with the threading tool 6 can be positioned from the tip of the steel pipe 1 to the burr 3 at the same pitch as the thread of the thread 2. And send it to the under-screw roughing tool 4
The burr 3 is removed by the burr removal processing section 42.

[0024]

As described above, according to the method of the present invention, the following industrially useful effects are brought about. By using a cutting blade that performs both under-screw roughing processing and deburring processing, it is possible to perform deburring processing immediately after threading without removing the steel pipe from the thread cutting machine, thus improving work efficiency. Since the conventional tool for roughing under screw can be used as it is, the size of the thread cutting machine is the same as before,
Equipment cost is also low and it is economically advantageous. The device for removing burrs that has been used in the past is no longer required.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a screw cutting machine.

FIG. 2 is a side view showing an under-screw roughing tool and a threading tool attached to a threading machine.

FIG. 3 is a schematic side view illustrating a step of removing burrs from screw threads by the method of the present invention.

FIG. 4 is a schematic side view illustrating a step of removing burrs from screw threads by the method of the present invention.

FIG. 5 is a schematic side view illustrating a step of removing burrs from screw threads by the method of the present invention.

FIG. 6 is a schematic side view illustrating a step of removing a burr on a thread by the method of the present invention.

FIG. 7 is a side view showing an embodiment of a cutting blade that is used for both rough machining under screw and deburring for carrying out the method of the present invention.

FIG. 8 is a partially enlarged view of FIG.

[Explanation of symbols]

 1 steel pipe 2 screw thread 3 burr 4 screw lower roughing tool 4a cutting blade 41 screw lower roughing part 42 burr removal processing part 5 holder 6 screw cutting tool 6a cutting blade 7 rotating body.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kozo Amada 1-2, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Akira Takashima 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. A screw cutting rough machining tool is formed into a shape having a cutting screw rough machining portion and a burr removal machining portion, and the unscrew rough machining tool and the deburring rough machining portion surround a fixed steel pipe. A screw cutting tool is arranged on a rotating body, and then the screw undercutting roughening tool and the thread cutting undercut tool are rotated in the circumferential direction of the steel pipe by the rotating body to produce the screw undercutting roughening tool. The steel pipe is subjected to a screw roughing process by the screw thread roughing portion of the cutting blade, and then the steel pipe is threaded by a cutting blade of the thread cutting tool, and then the screw screw is processed. A deburring method for thread ridges, wherein deburring processing is performed on the threads of the steel pipe by the deburring processing portion of the cutting blade of the roughing tool.