JPS63212409A - Machine for machining inner wall of pipe - Google Patents

Abstract

PURPOSE:To improve both machining accuracy and efficiency by employing a rotary chuck which makes one turn when it is driven, placing the chuck on the lower side, placing a rotary spindle above the chuck, and rotating a spirally formed cutter simultaneously in the same direction with that of a pipe. CONSTITUTION:A deformed thin wall pipe 3 is attached with an accuracy of an approximate true circle to a chuck 2 having a cylindrical piece 2, a projecting claw G, and a large space S. After that, a rotary spindle 4 equipped with a tool 8a consisting of a spirally formed cutter having for example 14-16 cutting edges is simultaneously lowered and rotated to rotate the tool 8a. The spindle 4 is then moved in the lateral direction to bring the tool 8a into contact with the inner wall surface of the pipe 3. The tool 8a is rotated at 300rpm per one turn of the pipe 3 in the same direction with that of the pipe 3 to cut a groove 16. In this way, a number of grooves can be formed on the inner wall surface 15 of the pipe 3 efficiently with a high accuracy within a short period of time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a pipe inner wall processing machine that forms grooves on the inner wall surface of a thin-walled pipe, for example, to prevent rubber boots from falling off on the inner wall surface of an outer shell that serves as a rolling shock absorber for a vehicle. This invention relates to a pipe inner wall processing machine that forms a large number of grooves for pipes.

[Conventional technology]

Rolling shock absorbers are considered as an effective means for preventing left and right shaking when driving around curves, and have recently been installed in large vehicles.

The rolling shock absorber has a rubber boot F attached to one end of an outer shell (an irregularly shaped thin-walled pipe) 3 in which the central part of the pipe is deformed, as shown in Figures 10 to 12. It absorbs side-to-side shaking and keeps the vehicle level.

Incidentally, a large number of grooves 16 are formed on the inner wall surface 15 of one end of the thin-walled pipe 3 in order to prevent the rubber boot F from falling off due to internal pressure.

In general, this groove 16 is machined using a horizontal lathe, with the pipe to be machined mounted on a rotatable chuck and a cutter consisting of a comb-shaped bit on a fixed tool rest, or one cutter is attached with a single bit. Each row is processed.

[Problem that the invention seeks to solve□]

The former machining method uses a comb-shaped cutting tool, so it is efficient as it can machine many grooves at the same time, but there is a limit to the machining load per time, and machining is required two or three times to obtain the desired groove. Also, the processing accuracy of the joint part is poor.

On the other hand, in the latter machining method, the grooves 16 are cut one by one, so the machining dimensions are not uniform and the machining efficiency is poor.

Furthermore, in either the former or the latter case, the pipe 3 to be processed cannot be mounted well, and in particular, in the case of processing a thin-walled pipe of an irregular shape using the above-mentioned outer shell of a vehicle, it is difficult to hold the pipe 3 and process it. Therefore, it was not possible to use it.

[Purpose of the invention]

The present invention has been made in view of the above, and its purpose is to improve the inner wall surface of a thin-walled pipe, especially even an irregularly shaped thin-walled pipe.
The objective is to efficiently machine a large number of highly accurate grooves on the inner wall surface.

[Means for solving problems]

To achieve the above object, the present invention provides a rotary chuck that rotates once when the chuck is driven in a pipe inner wall processing machine that forms a large number of grooves on the inner wall surface of a pipe to be machined mounted on the chuck using a cutter. At the same time, the rotary chuck is placed on the lower side and the rotary spindle is placed above it to form a vertical structure, and the cutter is made into a spiral formed cutter, and the spiral formed cutter is attached to a mandrel and attached to the rotating spindle. It uses the Will Bell method, which rotates the pipe to be processed and the cutter in the same direction at the same time.

[Action of the invention]

With the above configuration, a large number of grooves can be efficiently and precisely machined without imposing a large processing load by processing using the Will Bell method in which the pipe to be processed and the cutter are simultaneously rotated in the same direction using a spiral formed cutter.

Further, due to the vertical shape in which the rotating spindle is placed above the rotating chuck, the pipe to be processed is stably mounted and processing is facilitated. In particular, if the workpiece pipe is held with a rotary chuck equipped with a cylindrical piece that holds the lower end of the workpiece pipe and a chuck part with protruding claws that surround almost the entire circumference of the upper end of the workpiece pipe, the workpiece pipe can be held. Even if the thin-walled pipe is slightly deformed, it can be corrected to a nearly perfect circle due to the tightening force of the rotary chuck.

Further, by the spiral formed cutter processing, many grooves are simultaneously cut, and the inner wall surface of the pipe to be processed is also cut with high precision.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on the drawings.

1 to 3 show an embodiment of the pipe inner wall processing machine of the present invention.

Reference numeral 1 denotes a processing machine stand (frame), on which is provided a rotary chuck 2 that rotates once when driven.

The rotary chuck 2 is used to attach the pipe 3 to be processed.
As shown in FIGS. 4 to 7, it consists of a cylindrical piece 2b that holds the lower end of the pipe to be processed 3 and a chuck part 2a that holds the upper end of the pipe to be processed 3. A protruding pawl G is provided that surrounds almost the entire circumference of 3, and a wide space S is formed in the middle part. The rotary chuck 2 receives the rotation of a low reactor built into the frame 1 via a reduction gear, and rotates once when driven. The rotation speed of the rotary chuck 2 is, for example, 4 to 10 rec per rotation. Reference numeral 4 denotes a rotating spindle disposed above the rotary chuck 2, and is supported via a slide unit 6 provided on the main column 5 and a spindle unit 7 provided on the slide unit 6. That is, it has a vertical structure in which the rotary chuck 2 is disposed on the lower side and the rotary spindle 4 is disposed on the upper side. A mandrel 8 is attached to the rotating spindle 4, as shown in FIG. 8, to which a cutter 8a consisting of a spiral formed cutter is attached. A spindle motor M is provided on the spindle unit 7 holding the rotary spindle 4 via a reduction coupling 9, and the blade 8a consisting of a spiral formed cutter is rotated at about 35+++/main. There is. A Z-axis cylinder CZ is connected to the vertical slide plate 10a of the slide unit 6, and an X-axis cylinder CX is connected to the horizontal slide plate 10b. , it is also designed to move up and down. 11 is a vertical slide plate 10a of the slide unit 6
A weight suspended through a chain 12 is used to lighten the vertical movement of the rotating spindle 4, and also serves as a safety balancer.
1 is an operation switch unit, and 14 is a hydraulic oil pump unit.

All parts of this processing machine are driven by electrical control by pressing a start button, and the power source used is AC200V.

When forming grooves 16 to prevent the rubber boots F from falling off on the inner wall surface 15 of the outer shell (irregularly shaped thin-walled pipe) 3 that serves as a rolling shock absorber for a vehicle using such a pipe inner wall processing machine, first, the steps shown in FIG. As shown, the zero-rotation chuck 2 on which a workpiece pipe 3 with a wall thickness of 1.4 m, for example, is mounted, includes the cylindrical piece 2b and the chuck part 2a having the protruding claw G as described above.
Since the middle part has a wide space S, even if the center of the pipe is deformed and the thin-walled pipe 3 has a deformed shape, the deformed part is accommodated in the wide space S, and at the same time, the lower end of the pipe 3 to be processed is held in the cylindrical piece 2b. The chuck part 2a provided with the protruding pawl G surrounds and holds the upper end of the pipe 3 to be processed almost all the way around, so that the pipe 3 is securely held. Even if the thin-walled pipe (outer shell) 3 is slightly deformed by the tightening force of the rotary chuck 2, it is corrected to a nearly perfect circle.

Thereafter, the rotary spindle 4 equipped with the blade 8a, which is a spiral formed cutter having 14 to 16 cutting blades, is lowered (Z-axis movement), and at the same time, the blade 8a attached to the mandrel 8 is rotated. Rotate. Next, move the rotating spindle 4 horizontally (X-axis direction)
The cutter 8a is brought into contact with the inner wall surface of the pipe 3 to be processed, and cutting is started. Inner wall surface 15 of pipe 3 to be processed
The cutting process of the groove 16 is performed by rotating the pipe 3 to be processed once, while using a cutting tool 8 consisting of a spiral formed cutter.
Rotate a in the same direction at 300 revolutions per minute. By this groove cutting, as shown in FIG. 9, a large number of grooves 16 are simultaneously cut with high accuracy on the inner wall surface of the pipe 3 to be processed, and the inner wall surface 15 of the pipe 3 to be processed is also lightly cut to make the surface straight. It becomes a yen. Therefore, accurate inner wall surface processing with highly accurate grooves 16 can be obtained. In addition, the inner wall surface 1 of the pipe 3 to be processed
In the case of an outer shell that serves as a rolling shock absorber for a large vehicle, the groove 16 formed in the groove 5 has a pitch of 1,
Approximately 30 grooves 16 each having a width of 0.3 m and a depth of 0.2 to 0.3 m will be formed.

After cutting, the rotary spindle 4 is moved back, the rotation is stopped, and the blade 8a consisting of a spiral formed cutter is removed.
is raised from the position of the pipe to be processed 3 (in the Z-axis direction).

Thereafter, the steps 0 and above in which the rotary chuck 2 is opened and the pipe 3 to be processed is taken out are all automatically driven by electrical control.

By processing the inner wall surface 15 of the pipe 3 to be processed in this manner, a large number of highly accurate grooves 16 can be efficiently formed on the inner wall surface 15 in a short time (each processing time is about 33 seconds).

Although the above embodiment describes the case where a large number of grooves 16 are formed in the inner wall surface 15 of an irregularly shaped thin wall pipe 3 such as an outer shell serving as a rolling shock absorber, the present invention is of course not limited to this. Needless to say, it is suitable for forming a large number of grooves on the inner wall surface of other thin-walled pipes.

〔Effect of the invention〕

As described above, the present invention has a vertical structure in which the chuck is a rotary chuck that rotates once when driven, the rotary chuck is disposed on the lower side, and the rotary spindle is disposed above it, and the cutter is The spiral formed cutter is attached to a mandrel and attached to a rotating spindle, and the pipe to be processed and the cutter are rotated in the same direction at the same time. The pipe to be processed is held securely with a chuck, and the inner wall surface of the thin-walled pipe, especially even the thin-walled pipe with an irregular shape, is cut using a spiral formed cutter that rotates the pipe and the cutter in the same direction at the same time. The effects of the present invention are extremely large, such as being able to efficiently machine a large number of highly accurate grooves on a wall surface.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the pipe inner wall processing machine of the present invention, with Figure 1 being a front view, Figure 2 being a side view of one side, and Figure 3 being the other side. 4 is an enlarged side view of a partial cross-section of the main part of Fig. 2; Figs. 5 and 6 are an enlarged plan view of the main part of the chuck section of the rotary chuck; Fig. 6 is an enlarged plan view of the main part; Fig. 7 is an enlarged sectional view of the cylindrical piece of the rotary chuck, Fig. 8 is an enlarged sectional view of the rotary spindle portion equipped with a mandrel equipped with a spiral formed cutter, and Fig. 9 is an enlarged sectional view of the main part. An enlarged cross-sectional view of the main part of the inner wall surface of the processed pipe, FIG. 10 is a cross-sectional view of an example of an outer shell that becomes a rolling shock absorber for a vehicle, FIG. 11 is a cross-sectional view taken along line A-A, and FIG. B
FIG. 1... Processing machine stand (frame), 2... Rotating chuck, 3... Processed pipe (outer shell (thin wall pipe))
), 4... Rotating spindle, 8... Mandrel, 8
a...A knife consisting of a spiral formed cutter. Figure 1 Figure 2 Figure 3 Figure 10 Figure 11 Figure 12

Claims (2)

[Claims] (1) In a pipe inner wall processing machine that uses a cutter to form a large number of grooves on the inner wall surface of a pipe to be machined that is attached to a chuck, the chuck is a rotary chuck that rotates once when driven, and the rotary chuck is placed on the lower side. It has a vertical structure with a rotating spindle placed above it, and the cutter is a spiral formed cutter, and the spiral formed cutter is attached to a mandrel and attached to the rotating spindle, and the pipe to be processed and the cutter are simultaneously connected. A pipe inner wall processing machine characterized by a Will Bell method that rotates in the same direction for processing. (2) The rotating chuck consists of a cylindrical piece that holds the lower end of the pipe to be processed and a chuck part that holds the upper end of the pipe to be processed.The chuck part has a protrusion that surrounds almost the entire circumference of the pipe to be processed. The pipe inner wall processing machine according to claim 1, wherein the pipe inner wall processing machine is provided with claws.