JPH025526B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting device for metal tubes, round bars, etc. (hereinafter referred to as pipes), and more specifically, the present invention relates to a cutting device for metal tubes, round bars, etc. Related to cutting equipment for steel pipes, etc.

Pipes are subjected to various cutting processes such as cutting and thread cutting. For example, pipes used for oil country tubular goods, etc., are cut at both ends with a cutting machine in the finishing line, and then threaded at both ends. must be performed perfectly, so extremely high precision is required. On the other hand, such pipes are manufactured at high speed and sent to a finishing line, so the threads must be cut in an extremely short time (about 20 to 40 seconds per pipe) and then transported to the next process. First, high-precision technology is required for its work.

For threading the end of a pipe, there are two types: a pipe rotation type in which the tool is fixed and the pipe is rotated to cut the thread, and a tool rotation type in which the pipe is fixed and the tool is rotated to cut the thread. However, the present invention can be effectively applied to both methods.

For example, in a tool-rotating thread cutting device, three to four master slides that slide toward the center are attached to a die head driven by a spindle, and grooves provided in the length direction of the master slides are provided with a die head driven by a spindle. A chaser block with a cartridge attached with a tool is fitted and fixed so that both are substantially flush, and the die head is advanced to cut a thread. Note that the master slide is in practical use so that it can slide.

By the way, there are about 10 different sizes of standard pipes for cutting threads (e.g. 114.3mm to 244.5mm), so tools (e.g. turning, chaser) must be used according to the size of the pipe. Must be replaced. However, the cartridge to which the tool is attached is configured to be attached from the side of the chaser block, and the attachment and detachment work is inefficient and takes a lot of time. Since the production line had to be stopped to change tools, the loss time caused by this was extremely large and became a major obstacle to improving productivity.

In the present invention, when changing the tool as described above,
To provide a cutting device for steel pipes, etc., which allows cartridges to be easily replaced and firmly fixed, and which eliminates the drawbacks of the prior art.

The apparatus for cutting steel pipes and the like according to the present invention includes a chaser block, a cartridge, a clamp mechanism, and a clamp mechanism fixing fitting. The chaser block is attached to the die head, has a substantially rectangular cutout on one side of the lower end when viewed from the front side of the die head, and has a side wall corresponding to the diameter direction of the die head and an upper wall perpendicular to the side wall. It has a cutout section. The cartridge is equipped with a cutting tool on one side, has a first sloping part on the top that becomes wider as it goes upward, and the other side and the top are the side walls and top wall of the cutout part of the chaser block. comes into contact with.

The clamp mechanism has an upper part that penetrates a part of the upper wall of the notch of the chaser block and is inserted into the chaser block, has a through hole in the upper part that has a third sloped part whose upper side and lower side are sloped, and has a through hole in the lower part that has a third inclined part with sloped upper and lower sides. The cartridge has a second sloped portion corresponding to the first sloped portion of the cartridge, and the second sloped portion is joined to the first sloped portion.

The clamp mechanism fixing fitting is composed of a bolt member and a guide member, and the bolt member is inserted into the through hole of the clamp mechanism so that the axial movement of the chaser block is restricted, and the head can be operated from the front side of the chaser block. It can be installed like this. The guide member has a fourth inclined portion corresponding to the third inclined portion of the clamp mechanism, and is threadedly engaged with the bolt member and moves in the axial direction as the bolt member rotates. presses the third inclined portion to move the clamp mechanism up and down.

In the present invention, with the above configuration, the clamp mechanism is moved upward by rotation of the bolt member in a predetermined direction, and the first inclined part of the cartridge is pressed by the second inclined part, thereby cutting the cartridge into the chaser block. Press against the side and top walls of the notch to secure the cartridge to the chaser block. On the other hand, when taking out the cartridge, the fixation is released by rotating the bolt member in the opposite direction to that described above, and the cartridge can be taken out from the front of the die head.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal cross-sectional view showing the main parts of a thread cutting device embodying the present invention, particularly the structure near the die head. In the figure, 1 is a thread cutting machine, and 2 is a spindle, which is equipped with a taper mechanism 3 and is configured to be rotated by an electric motor (not shown) and to be able to move in the axial direction. 30 is a master slide, and a tilting member 31 connected to the tilting surface 4 of the taper mechanism 3 via a bearing is provided at the rear part. Reference numeral 5 denotes a driving member that can move the entire thread cutting machine 1 in the axial direction by a servo motor or the like. 10 is a chaser block, which is fixed to the master slide 30 with bolts 34, 34a. A cartridge 15 is fixed to the lower end of the cartridge 15, and a turning 16 and a chaser 1 are attached to the cartridge 15.
7 is installed. 6 is an inner support, and P is a pipe.

In the above-mentioned thread cutting machine, the pipe P is transported laterally from the previous process by a walking beam or the like and fed onto the center line 0-0 of the thread cutting machine 1, and is cranked by a chuck (not shown) and , a positioning chuck (not shown) or an inner support 6 for centering. Next, when the spindle 2 is rotated and moved forward, the master slide 30 is slid toward the center by the taper mechanism 3, and the chaser 17 is aligned with the thread cutting position of the pipe P.

In this state, when the drive member 5 is advanced and the taper mechanism 3 is gradually and continuously retreated, the master slide 30 (therefore the chaser 17) moves forward while rotating along the taper, and the end of the pipe P Cut a tapered thread. Note that at this time, the surface of the pipe is cut into a tapered shape by the turning 16 that precedes the chaser 17. Note that a parallel thread can be cut if the taper mechanism 3 is not retreated and the master slide 30 is not displaced. When thread cutting is finished, move the entire thread cutting machine 1 backward, release the chuck clamp, and remove the pipe P.
is sent to the next process.

Next, a steel pipe cutting apparatus according to the present invention will be explained. FIG. 2 is a front view of the embodiment of the present invention, FIG. 3 is a side view thereof, and FIG. 4 is a
It is an A sectional view.

A protrusion 11 is provided over almost the entire length of the rear surface of the chaser block 10 , and this protrusion 11 is slidably fitted into a groove 31 provided on the front surface of the master slide 30 . It is fixed with bolts 34, 34a. Therefore, Chaser block 10
is configured such that its position can be adjusted in the diametrical direction with respect to the master slide 30.

A cartridge 15 is attached to the lower end of the chaser block 10. This cartridge 1
5, turning 1 along the axial direction of the workpiece
6 and chaser 17 are attached. Since the turning and chaser are integrally attached to the cartridge in this way, there is no need to use each of these cutting tools separately when installing and removing them, and it is only necessary to use these cutting tools as one unit, and dimensional adjustment is also easy. Since it can be done outside (before installation), the time required for rearrangement is short. Furthermore, the relative positions of both the turning and chaser can be determined with high precision, which eliminates variations in the service life of these cutting tools. Standardization of cartridge dimensions has the advantage that various turnings and chasers can be mounted on the same chaser block.

Next, the fixing structure of the cartridge 15 will be explained. A notch 10 having a substantially rectangular shape when viewed from the front is formed on one side of the lower end of the chaser block 10.
a is provided, and one side of the cartridge 15 is arranged so as to come into contact with the side wall of the notch 10a. The other side of the cartridge 15 is provided with an inclined portion 15a. On the other hand, a clamp mechanism 18 is attached to the chaser block 10 so as to be movable in the vertical direction.
The cartridge 15 is disposed on the other side of the cartridge 15 so that the cartridge 15a and the inclined portion 15a of the cartridge face each other. A quick tool change mechanism 19 is attached to the front of the chaser block 10. This mechanism can be operated from the front of the chaser block 10 and is connected to the clamp mechanism 18.
It plays the role of moving up and down as well as fixing. That is, as shown in FIG. 4 or FIG. 5A and B, this mechanism includes a bolt member 19a and a guide member 19b.
and a ring member 19c. Further, the member indicated by the symbol 19d is the bolt member 1
It is a separate member from 9a, and is a member for covering the through hole into which the bolt member 19a is inserted.

This bolt member 19a is threaded only at the central portion where it screws into the guide member 19b, and is not threaded at its tip. Further, even if the head of the bolt member 19a rotates, the bolt member 19a is configured to be restricted from moving in the axial direction. That is, the movement of the bolt member 19a in the a' direction is restricted by the ring member 19c screwed into the chaser block 10 adjacent to the head of the bolt member 19a in the axial direction. This is done by restricting the movement of people.

Further, the movement of the bolt member 19a in the b' direction is restricted by the protruding portion 10b inside the chaser block 10 coming into contact with the back side of the head of the bolt member 19a, and the head of the bolt member 19a restricts the movement in the b' direction. It is done by being done. in this way,
Although the bolt member 19a rotates with respect to the chaser block 10, it is attached so that it does not move in the axial direction, so even if the head of the bolt member 19a is rotated with an appropriate tool, the bolt member 19a will not move. does not move in either the a' or b' directions, but simply rotates.

A guide member 19b is screwed into the center of the bolt member 19a, and the upper and lower sides of the cross-sectional shape of the chaser block 10 in the vertical direction of the guide member 19b are shown in FIGS. 5A and 5B. It is inclined in the axial direction of the bolt member 19a. In this embodiment, the guide member 19b
The upper and lower sides slope downward toward the head of the bolt member 19a.

This guide member 19 is located at the top of the clamp mechanism 18.
c and a hole through which the bolt member 19a passes, and this hole has an inclined surface corresponding to the inclination of the upper and lower sides of the guide member 19b.

5A and 5B are explanatory diagrams of the operation of the quick tool mechanism 19, FIG. 5A is an explanatory diagram of the operation when the cartridge 15 is clamped to the chaser block 10, and FIG. It is an explanatory diagram.

In FIG. 5A, when the head of the bolt member 19a is turned in a predetermined direction, the bolt member 19a rotates but does not move in its axial direction. Move from the position to the position indicated by the dashed line in the direction shown by the arrow. When the guide member 19b moves in the direction of the arrow,
This will push up the clamp mechanism 18.

In the perspective view of FIG. 6, when the clamp mechanism 18 is pushed up, the inclined part 18a provided at the lower part of the clamp mechanism 18 presses the inclined part 15a of the cartridge 15 in the direction shown by arrow a. As a result, the cartridge 15 is inserted into the notch 1 of the chaser block 10.
It will be pressed and clamped against the top and side surfaces of 0a. During cutting, when the chaser block 10 is rotated in the direction of arrow c, a force in the direction of arrow a is applied due to the cutting resistance, and the cartridge 15 is further firmly fixed by tightening.

On the other hand, FIG. 5B is an explanatory diagram of the operation when removing the chaser block 15.
When the head of a is turned in the direction opposite to that shown in FIG. 5A, the bolt member 19a rotates in the opposite direction to that shown in FIG. 5A, and the guide member 1 screwed into the bolt member 19a is
9b moves in the direction shown by the arrow from the position indicated by the solid line to the position indicated by the broken line. When the guide member 19b moves in the direction of the arrow, it pushes down the clamp mechanism 18. In the perspective view of FIG. 6, when the clamp mechanism 18 is pushed down, the inclined part 18a provided at the lower part does not generate a force that presses the inclined part 15a of the cartridge 15 in the direction shown by the arrow a. As a result, the cartridge 15 is released from the pressure on the surface of the notch 10a of the chaser block 10, and the cartridge 15 can be taken out in the direction of arrow b.

Note that the bolt member 19a in FIGS. 5A and 5B
An extremely small amount of rotation is sufficient, and in this sense, this clamp mechanism fixing fitting is called a quick tool change mechanism.

Although the above-described embodiment is a case in which the present invention is applied to a tool-rotating type thread cutting device, it goes without saying that the present invention can also be applied to a pipe-rotating type thread cutting device.

As is clear from the above description, the apparatus for cutting steel pipes, etc. according to the present invention allows the work of attaching the cartridge equipped with the cutting tool to the chaser block from the front of the apparatus, making the work simple. Therefore, the working time is significantly shorter than that of the conventional method. Also,
During cutting, the cutting resistance acts on its own and the cartridge can be more firmly fixed.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the main parts of a thread cutting device embodying the present invention, FIG. 2 is a plan view of an embodiment of the present invention, FIG. 3 is a side view thereof, and FIG. 4 is A--A in FIG.
It is an A sectional view. 5A and 5B are diagrams for explaining the operation of the quick tool change mechanism, and FIG. 6 is a perspective view for explaining the operation of the quick tool change mechanism. 1...Thread cutting device, 2...Spindle, 3...
... Taper mechanism, 5 ... Drive member, 6 ... Inner support, 10 ... Chaser block, 15 ...
Cartridge, 16... Turning, 17... Chaser, 18... Clamp mechanism, 19... Quick tool change mechanism, 30... Master slide.

Claims (1)

[Scope of Claims] 1. A cutting device for steel pipes, etc. equipped with a cartridge equipped with a cutting tool, which is attached to a die head and has a substantially rectangular notch on one side of the lower end when viewed from the front side of the die head. , a chaser block having a cutout portion having a side wall corresponding to the diameter direction of the die head and an upper wall substantially perpendicular to the side wall; a cutting tool is attached to one side, and the cutout portion has a cutout portion having a cutout portion having a cutout portion having a side wall corresponding to the diameter direction of the die head and an upper wall substantially perpendicular to the sidewall; a cartridge having a first slanted portion, the other side and the top portion of which abut against the side wall and top wall of the cutout portion of the chaser block; and has a through hole having a third sloped part with sloped upper and lower sides at the inserted upper part, and a second sloped part corresponding to the first sloped part of the cartridge at the lower part,
a clamp mechanism in which a second inclined part joins the first inclined part; the clamp mechanism is inserted into a through hole of the clamp mechanism, is supported by the chaser block with axial movement restricted, and the head is operated from the front side of the chaser block; and a fourth inclined portion corresponding to the third inclined portion of the clamp mechanism, which is threadedly engaged with the bolt member and moves in the axial direction as the bolt member rotates. and a clamp mechanism fixing fitting in which the fourth inclined part presses the third inclined part to move the clamp mechanism up and down; the clamp mechanism is moved by rotating the bolt member in a predetermined direction to move the guide member. The cartridge is fixed to the chaser block by moving the cartridge upward and pressing the first slope of the cartridge with the second slope, thereby pressing the cartridge against the side wall and top wall of the notch of the chaser block. Cutting processing equipment for steel pipes, etc.