JPH038888B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a workpiece clamping device for a compound saw machine, and in particular, a large number of equal-diameter circular sections such as pipes are charged in parallel between a support and a pressing device, and The present invention relates to a workpiece fixing device for a compound saw machine such as a circular saw machine that simultaneously divides and cuts within a plane.

As a compound saw machine, one is known in which a circular cross-sectional body such as a pipe is loaded in the axial direction from a roll table or the like and pressed against a pedestal from above or from the side. In both cases, the saw blade moves toward the pedestal from above or from the side during cutting, and serves to press the section to be divided against the pedestal. A problem with all known clamping devices is that the diameter tolerances of the pipes are variable and do not guarantee reliable horizontal clamping.
For example, in the case of welded pipes with a diameter of 200 mm or less, if a 1% outer diameter deviation is considered normal, a variation of at least ±0.5 mm is expected. If there is such a variation in diameter, a tube with a large diameter deviation in the negative direction that is sandwiched between two tubes may not be gripped by the pressing device and cannot be placed on the pedestal. The result is not only poor cutting accuracy and rough cut surfaces, but also shortened saw blade life.

On the other hand, it is already known to use an elastic intermediate material which is compressed to a greater or lesser degree depending on the diameter of the tube. Although such an intermediate material is certainly an improvement, since the degree of compression varies from tube to tube, the holding force cannot be precisely specified. Moreover, such elastic intermediates wear out very quickly.

The object of the present invention is to ensure reliable fastening of the constant cross-section bodies to be divided by a specifiable fastening force, reduce downtime by adopting structural parts that function properly, and allow the charging of workpieces. The object of the present invention is to realize a workpiece fixing device for a double saw machine that does not take time to eject.

In order to solve this problem, the workpiece clamping device proposed by the present invention is designed to hold down a horizontal circular cross-section workpiece whose support body is adjustable in height with respect to the stroke motion of the saw blade guided from the bottom to the top. It is configured as a platen, and a number of fluid-operated rams are arranged on the underside of the platen for pressing the circular section body against the platen,
It is characterized in that the rams are guided vertically with a mutual center spacing not greater than the smallest circular section diameter, and the outermost circular section is laterally supported.

The workpiece clamping device obtained here has a specifiable pressing force, and when all rams are connected to a common pressure fluid source, the pressing force is set uniformly on each circular section to be clamped. be done. The rams are arranged in such a way that at least one ram always acts on each circular section to press it against a platen which serves as a support.

Another feature of the present invention is that the platen is provided with supports whose mutual spacing is variable and which laterally supports the circular section. The support engages the ram eccentrically with the circular body to prevent lateral movement of the circular body under a lateral force.

Another feature of the present invention is that the rams are arranged in a staggered arrangement of two or more rows, although the lateral extent of the rams must be increased, especially when tightening small diameter tubes.

Yet another feature of the invention is that the pressing front of the ram is rounded. This prevents damage to the surface of the workpiece to be clamped.

For particularly fragile workpieces, it is advisable to provide an elastic pad on the pressing front of the ram. This pad can be, for example, a replaceable cap made of plastic material.

Furthermore, it is conceivable in accordance with the invention to harden each ram in its entirety or in part, depending on the nature of the workpiece to be clamped and on how large the holding force is to be chosen.

Another feature of the invention is that the ram is square shaped;
Further, a pad having a swingable structure including a spherical joint means is provided at the tip of the ram so that the end surface of the pad can directly face the outer circumferential surface of the charged circular section. With such a structure, the buckling strength of the ram can be reduced.

A particularly preferred embodiment of the invention is characterized in that the ram is formed by a piston of a piston-cylinder unit. This piston can be accommodated in a device with a small area, and is particularly important for securing small diameter pipes. This is because the greater the number of pistons that act on one circular section, the more favorable holding force can be obtained for that section.

The pressing stroke of the piston is adapted to the distance between the support and the pressing device, and its size is at least larger than the maximum outer diameter difference of the circular section to be secured.

A preferred embodiment of the opening/closing coupling structure of the present invention is such that the support body is configured as a height-adjustable horizontal circular-section holding platen and is circularly connected to the saw blade guided from bottom to top. The sections are pressed so that the platen can be pivoted in a vertical plane about an axis laterally arranged parallel to the sections for loading the sections.

According to this proposal of the present invention, the tube can be charged horizontally using a double saw machine instead of in the direction of the longitudinal axis of the tube as was conventionally done, so that the clamping device of the present invention can Tube loading time is significantly reduced. Of course, in connection with this proposal, if the locking device is configured as described above, the platen itself, which serves as a support, does not need to generate a pressing force, and the platen can be easily rotated, which is convenient. It is.

According to another feature of the present invention, the platen is provided with a drive mechanism on the side of its pivot axis that engages with a lever that is integrated with the platen. A piston-cylinder unit is preferred as this drive mechanism.

When the swing drive mechanism is installed on the side of the swing axis,
Since there are no driving elements on the open side, tube loading from this side can be carried out without any hindrance.

Another feature of the invention is that the circular section in which the platen is inserted has centering and/or abutments on both sides, the abutments having correspondingly shaped abutments formed in the fixed part of the device. It is to come into contact with the bearing part.

These bearings make the device compact and stable and, thanks to the separately provided centering section, are sufficiently rigid to withstand high tensions in all force directions.

Preferably, the centering portions are formed as oppositely inclined cones. The plane of each cone is parallel to the platen's pivot axis. Each of these cones centers the platen and eliminates the possibility of off-vertical tension on the pivot axis.

Another feature of the present invention is that locking means is provided on the opposite side of the platen from the pivot axis for holding the platen in the closed state while locking the circular section. This locking means automatically engages with the locking portion of the mating device part at the same time as the platen rotates to the locking position.
The latch shall be releasable by fluid actuation.

With this arrangement, the platen is locked upon the closing operation and can be re-opened by simply pulling the latch by the fluid drive. The latch also confines the force flux within the device so that no tension is applied to the drive mechanism for rotating the platen.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

In Figure 1, code 1 is the trapezoid R fixed on the foundation.
Shows a compound saw machine including: The trapezoid R includes a horizontal pedestal 6 on which parallel pipes 2 of the same diameter are placed, and the pipes 2
is held by a horizontal platen 4 which serves as a support. The platen 4 can be raised and lowered by means of piston cylinder units 5 on both sides, and can be adapted to various pipe diameters. On the pedestal 6 of the compound saw 1, rams 9 according to the invention are arranged in two rows in a staggered arrangement, as can be seen in the plan view of FIG. The ram 9 is designed as a piston of a vertically arranged piston-cylinder unit, as shown in FIG. The cylinder chambers 10 of these piston-cylinder units communicate with each other by pressure fluid passages 12 and are supplied with fluid pressure at 11 from a pressure fluid source (not shown). The piston end ring B of the ram 9 limits the stroke to a constant size.

As also shown in FIG. 3, the front side 13 of the ram 9
That is, the surface that contacts the tube is rounded to prevent damage to the tube surface.

For loading and unloading workpieces of the double saw machine, the platen 4 together with the piston-cylinder unit 5 can be pivoted into the chain-dot position 4a. For this purpose, a piston cylinder unit 15 pivotally supported in the trapezoid R engages with a lever arm 16 of the platen 4. This configuration allows the device to open on the right side in the drawing, and tubes can be easily inserted from this side.

Centering of closed locking devices, especially platen 4
For centering the platen 4, a bevel 17 is provided, which at the same time provides the necessary lateral holding effect for the device. In addition, the platen 4 comes into contact with the parallel contact surface 18 of the trapezoid R, so that the entire platen has a rigid structure.

In order to hold the platen 4 in the closed position, a latch 19 is provided on the side of the platen 4 which is to be opened and which engages with a catch 21 of the platen 4. For the release of the latch 19, a piston-cylinder unit 20 is provided which moves the latch to the locking part 2.
Remove from 1.

Next, the operation of this device will be described.

The tube 2 is loaded into the clamping device from the side with the platen 4 in the open position (position 4a). The loaded tube 2 is placed on lateral supports 3 whose mutual spacing is adapted to the tube diameter.
At the same time, the platen 4 is pivoted downward and the latch 19 engages with the locking part 21 to lock the platen, thereby forming a support for the tube 2. . In order to clamp the tube 2 to this support (platen 4), the ram 9 is supplied with a pressure fluid and protrudes within its stroke area, pressing against the surface of the tube to be clamped. The ram 9 protrudes to different lengths depending on the position of the tube above it, but its pressing force is always equal. Once all the tubes 2 have been pressed against the platen 4, the saw blade 7 is actuated and rises in the direction of arrow 8 to begin cutting.

The tubes 2 can also be fed in the longitudinal direction of their axis, in which case it goes without saying that the platen 4 must be raised by the piston-cylinder unit 5 so that the tubes 2 can be loaded.

[Brief explanation of the drawing]

In the accompanying drawings showing one embodiment of the present invention, FIG. 1 is an elevational view of the workpiece clamping device of the present invention, FIG. 2 is a plan view showing an arrangement of rams according to the present invention, and FIG. FIG. 3 is an enlarged cross-sectional view taken through the center plane of the ram.
R: pedestal, 1: compound saw, 2: circular section body (pipe),
3: Side support, 4, 5: Platen and its lifting mechanism, 6: Tube holder, 7, 8: Saw blade and its operating direction, 9, 13: Ram (piston) and its pressing front, 12 : Pressure fluid passage, 14, 15:
Platen rotation axis and rotation drive mechanism, 17: Centering collision part (gradient part), 18: Contact surface, 19, 21:
Latch and locking part, 20: Piston cylinder unit for latch release.

Claims (1)

[Scope of Claims] 1. Processing using a compound saw machine such as a circular saw machine, which inserts a large number of equal-diameter circular cross-section bodies such as pipes in parallel between a support body and a pressing device and cuts them simultaneously in a vertical plane. In the object securing device, the support body is configured as a height-adjustable horizontal circular section body 2 and a holding platen 4 for the stroke movement of the saw blade guided from the bottom to the top. A number of fluid-operated rams 9 are arranged on the lower side for pressing the circular section 2 against the platen, said rams being vertically spaced from each other with a center spacing not larger than the smallest circular section diameter. A workpiece fixing device characterized in that the platen 4 is provided with supports 3 whose mutual spacing is variable and which supports the circular section body 2 from the sides. 2. Claim 1, characterized in that the rams 9 are arranged in two or more rows in a staggered arrangement.
The workpiece clamping device described in section. 3. The workpiece clamping device according to claim 1 or 2, characterized in that the pressing front surface 13 of the ram 9 is rounded. 4. Workpiece clamping device according to claim 1 or 2, characterized in that the pressing face 13 of the ram 9 is provided with an elastic pad. 5. Claim 1, wherein the ram 9 is entirely or partially quenched.
The workpiece securing device according to item 1, 2 or 3. 6. The workpiece fixing device according to claim 1, wherein the ram 9 is formed in a rectangular shape. 7. Claims 1 to 6, characterized in that a pad having a swingable structure is provided at the tip of the ram 9 so that the end surface of the pad can directly face the outer peripheral surface of the circular section body 2. The workpiece fixing device described in item 1. 8. characterized in that the ram 9 is formed by a piston of a piston-cylinder unit,
A workpiece fixing device according to any one of claims 1 to 7. 9. characterized in that, for loading the circular section 2, the platen 4 can be pivoted in a vertical plane about an axis 14 arranged laterally parallel to the circular section;
A workpiece fixing device according to any one of claims 1 to 8. 10. Processing according to claim 9, characterized in that the platen 4 is provided with a drive mechanism 15 on the side of its pivot shaft 14, which engages with a lever 16 that is integrally constructed with the platen 4. Object securing device. 11. The workpiece fixing device according to claim 10, characterized in that the drive mechanism 15 is a piston-cylinder unit. 12 the platen 4 is provided with centering and/or abutment portions 17 on both sides of the inserted circular section body 2;
Workpiece clamping device according to claim 9, characterized in that the abutting portion abuts a correspondingly shaped bearing formed in the fixed part of the device. 13. Claim 12, characterized in that the centering portions (17) are formed as mutually oppositely inclined pyramids, the plane of which is parallel to the pivot axis (14) of the platen (4). The described workpiece securing device. 14. A locking means 19 for holding the platen 4 in a closed state while the circular section body 2 is fixed is provided on the opposite side of the platen 4 from the rotation axis 14. The workpiece fixing device according to item 9. 15. The locking means 19 is a latch releasable by a fluid drive 20, which automatically engages a locking part 21 of a mating device part as soon as the platen 4 is pivoted to the locking position. A workpiece securing device according to claim 14.