JPS5824207B2 - Jidokansetsudanki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a tube feeding device, a stopper cooperating with the tube feeding device, cutting blades which operate mutually orthogonally and sequentially in a common plane perpendicular to the tube axis; This invention relates to an automatic pipe cutting machine consisting of a cutting blade.

Devices for automatically cutting off pieces of tubing of the same length are well known;
It consists of a clamping device with a rotating saw blade or parting tool guided around the circumference of the tube to be cut off and clamping the tube at short intervals.

It is constructed in a similar manner, but the tube is clamped within the clamping device and rotated as in a lathe, and the turning tool or circular saw plate is placed in the gap provided between the clamping devices. Cutting machines that are adapted to be pushed into the machine are also known.

In all these devices, very long working times are required to cut off the individual tube sections and, in addition, so-called "burrs" are formed on the cut-off tube sections as well as on the remaining tube ends.
are formed, and these ridges must be removed in a separate working process, which takes a long time, and it is generally not possible to precisely make the desired right-angled cuts.

In order to avoid these drawbacks, the tube is guided through a cutting die equipped with a transverse slit, and within this transverse slit a stamping pressure is applied by means of a plate blade with a pointed tip and an approximately semicircular cutting edge. Attempts have already been made to divide the tube.

However, in this device, which is described in German Patent Application No. 1810052, when cutting the tube, the blades slightly deform the tube or create indentations in the tube.

Such a dent must be made circular again.

For mass-produced products, such post-processing is very expensive and, on the other hand, it is not possible to cut the tube sections exactly at right angles with such devices.

This is because burrs are created when the tube is divided, and
This is because this must be removed by special post-processing.

These post-processing operations not only make such mass-produced products considerably more expensive, but also lead to lower yields, especially if perfectly consistent and precisely cut tube sections are required.

The problem of mechanically cutting precise tube sections in a single operation was effectively solved for the first time by the tube cutting machine described in DE 22 44 347 A1.

That is, in this case the tube to be cut is clamped in a cutting die and is first cut through an arc-shaped tube wall section by one or two cutting blades, which are then guided at right angles to the cutting blades. It is completely separated by the cutting blade.

The cut points are consistent and the tube will not be deformed.

In practice, it has been found that although this cutting machine makes accurate, square and clean cuts, the length error exceeds the desired error range of ±0.2 mrn.

The object of the present invention is to eliminate such drawbacks, mechanically cut pipes of any cross section and any material at right angles, continuously and accurately in an extremely short period of time, and to meet the following requirements. Our goal is to provide automatic tube cutting machines that meet your needs.

In other words, (a) there should be no burrs or deformation at the end of the tube, (b) the length error range of the tube should be reliably kept within ±0.2 mm, and (c) the separated tube piece should be cut. (b) only the cutting die needs to be replaced when the diameter of the tube changes;

To solve this problem, the present invention provides an arrangement in which the cutting blade operates in a vertical direction, whereas the cutting blade operates in a horizontal direction, and each expandable cutting die has a polished inner tube. The guard holes are arranged so that the highest point on the inner peripheral surface of tubes of different diameters is always located at the same location, and can be rotated within a vertical plane that includes the tube axis and its position in the tube axis direction can be adjusted. a movable stop is connected to a horizontally actuated damping cylinder and a vertically movable lifting cylinder, and the rotatable stop is loaded by a spring; It was made possible to rotate upward from the horizontal position against the force of.

Next, embodiments of the present invention will be specifically described with reference to the drawings.

In FIG. 1, in order to allow the cutting blade 11 to cleanly cut the tube 4 or 4' without deforming it,
The cutting blade 10 is designed to preform at least one small arc-shaped incision in the tube wall, the cutting blade 10 and the cutting blade 11 moving in mutually perpendicular directions.

Such a device is described in the above-mentioned DE 22 44 347, but in this case each expandable cutting die always cuts in the center of the tube number hole. It was manufactured to be located at the center point of the die.

This required the cutting edge to be adjusted each time the cutting die was replaced to match the diameter of the tube.

However, according to the invention, the tube number hole 1 of each expandable cutting die 2 with polished inside is such that the highest point 3 of the inner circumferential surface of tubes 4 or 4' of different diameters is always at the same position. They are arranged as shown in Figure 1.

Therefore, the upper cutting blade can always be operated horizontally at a constant height, and there is no need to make new adjustments each time the cutting die is replaced.

Of course, if the pipe wall is also cut at the lower part of the pipe as in the illustrated embodiment, the lower cutting edge must be adjusted each time the pipe diameter changes, but this is not enough. Only the upper notch blade is essential for cutting without scratches, the lower notch blade can be omitted, and adjustment of only the lower notch blade can be performed extremely easily.

In FIG. 2, the driven feed roller 12 of the feed device is moved towards the stop 6 through the cutting die 2, which has opened the tube 4 or tube 4'.

It has been found that at very high feed speeds of 60 m/min, the error in the length of the cut tube sections becomes very large.

The reason for this is that the tube 4 strongly collides with the stopper 6, and this collision produces a reaction that prevents the tube 4 from coming into close contact with the stopper 6.

However, according to FIG. 2, this drawback can be eliminated by the fact that the stopper 6 is supported by a bearing 5 so as to be rotatable in a vertical plane and is connected to a buffer cylinder 1 that absorbs the collision force. It will be done.

As a result, the reaction force of the tube 4 generated at the stopper 6 is absorbed by the buffer cylinder 1.

This buffer cylinder 1 has a micro switch (not shown).
This microswitch closes the cutting die 2 when the axial position of the stopper 6 is adjusted, and then causes the cutting blade to perform cutting and cutting operations, and Open die 2 again.

Furthermore, the cut-off tube end must fall at the moment the cutting die 2 opens and make way for the tube 4 which is pushed back by the feed roller 12.

In order to drop the tube 4 which rests precisely against the stopper 6, the lifting cylinder 8 lifts the entire buffer cylinder 1 and the stopper 6, thereby causing the stopper 6 to fall.
is located above the tube end to allow the cut tube piece to fall.

Spring 9 that loads stopper 6 to be in a horizontal state
When the lifting cylinder 8 descends, even if there is a pipe end that has not yet fallen, a small impact that does not damage it is applied via the stopper 6, and this impact forces the pipe end to fall. urge

At the same time, the stopper 6 is returned to its horizontal starting position.

As described above, according to the configuration of the present invention, an extremely accurate length error within ±0.2 mm is maintained in the cut tube piece, and the cut tube piece is reliably removed from the automatic tube cutting machine. This provides advantages such as a clean cut without creating a burr or deforming the tube cross section.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing an automatic pipe cutting machine of the present invention having a cutting blade and a cutting blade, and FIG. 2 is a front view of FIG. 1. 1... Pipe receiving hole, 2...- Cutting die, 3... Highest point of inner peripheral surface, 4, 4'...
・Pipe, 5: Bearing, 6: Stopper, 1: Buffer cylinder, 8: Lifting cylinder, 9: Spring, 10... Cutting blade, 11... Cutting blade, 12... Supply roller.

Claims (1)

[Claims] 1 Automatic tube consisting of a tube feeding device, an expandable cutting die, a stopper, and cutting blades and cutting blades that operate sequentially at right angles to each other in a common vertical plane perpendicular to the tube axis. In a cutting machine, the cutting blade operates vertically, whereas the cutting blade operates horizontally, and the tube-receiving bore 1 of each expandable cutting die 2, polished on the inside, has a diameter of different diameters. A stopper that is arranged so that the highest point 3 on the inner circumferential surface of the tube 4 or 4' is always located at the same location, and that is rotatable in a vertical plane that includes the tube axis and whose position in the tube axis direction can be adjusted. 6 is connected to a horizontally acting damping cylinder 1 and to a vertically movable lifting cylinder 8, and the rotatable stop 6 is loaded by a spring 9, An automatic pipe cutting machine characterized in that it can rotate upward from a horizontal position against the force of the spring 9.