JPH0248370B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a beveling device for square steel pipes, etc., which is capable of accurately tracing the outer circumferential surface and also can form a desired beveling around the end thereof. .

Conventionally, beveling of various types of pipe materials has often been done by gas cutting, but when this method is used, the shape of the cut periphery may not be constant, and
It is not suitable for welding as it is because it may deteriorate. Therefore, we manually corrected the machining defects using a grinder or electric planer and removed the deteriorated layer, but this method was inefficient and required a significant amount of labor. .

In recent years, a type of square pipe machining that moves the cutting head in the X-axis and Y-axis directions to perform beveling on the peripheral edge has appeared, but this type of machine has problems when machining the sides, that is, the flat surface. However, I was unable to process the small rounded parts at the four corners.

Therefore, we still have no choice but to rely on manual processing such as grinding for this part, and from the viewpoint of improving productivity and processing accuracy, we recommend using a beveling machine that can automatically process up to this rounded part. development was requested.

The present invention has been made in view of the above circumstances, and the first object of the present invention is to adopt a profile cutting method along the outer circumferential surface of the workpiece and continuously perform beveling around the entire circumference of the workpiece. In addition to making it possible to do it automatically,
In addition, the purpose is to perform the desired beveling process with high precision through simple adjustment operations.The second objective is to create a square steel pipe that can perform smooth beveling process on workpieces of any size. Our goal is to provide bevel processing machines such as:

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of the beveling apparatus for square steel pipes and the like of the present invention will be described in detail.

The basic structure of the beveling machine according to the present invention includes a clamp device that clamps and fixes a workpiece material such as a square steel pipe (hereinafter simply referred to as the workpiece) in a predetermined position, and a clamp device that cuts the outer peripheral edge of the workpiece. First, the configuration of the former clamp device, which is equipped with a cutting device for processing, will be described.

In Figures 1 to 3 of the drawings, reference numeral 1 indicates machine base 2.
is a horizontal bed located on the front side of the machine base 1 (right position in Figure 1), and a third bed is located on the top of this horizontal bed 2.
A horizontal guide rail 3 shown in the left-right direction in the figure is provided. A pair of vice pieces 4a and 4b on both sides are engaged with this guide rail 3.
These vise pieces 4a and 4b are centripetally opened and closed by nut cylinders 5a and 5b fixed to their lower portions, respectively, and a feed screw shaft 6 with reverse threads screwed into these nut cylinders 5a and 5b. Ru.

The feed screw shaft 6 is rotatably supported by both ends of the guide rail 3, and an opening/closing operation handle 7 is fixed to one end thereof. Note that other means for opening and closing the vice pieces 4a, 4b include a hydraulic cylinder, an electric motor, etc., and these may be employed as appropriate.

Next, reference numerals 8a and 8b denote a pair of left and right columns erected on both sides of the horizontal bed 2 on which the vice device is disposed, and cross beams 9 are installed on these columns 8a and 8b so as to be vertically adjustable. A hydraulic cylinder 10 is fixed to the center of the cross beam 9 with the piston rod 10a facing downward, and a press plate 11 is attached to the lower end of the piston rod 10a. In addition, in the above, after the height of the cross beam 9 is set by the screw-type elevation adjustment means 12, the fixing pin 13,
13 to support columns 8a, 8b, and allows the press plate 11 to correspond to workpieces having various dimensions.

Furthermore, the reference numeral 14 indicates a roller for conveying the workpiece disposed on the front side of the horizontal bed 2, and this conveyor roller 14 is arranged in alignment with the receiving surface 3a formed on the upper surface of the guide rail 3 described above. Set up In this embodiment, a conveyor device C consisting of free rotating rollers is connected to the front side of the conveying rollers 14.

Thus, the workpiece is clamped from both sides by the vice pieces 4a and 4b, and the press plate 11
Clamp and fix the workpiece in place by pressing from above with the handle.

Next, when cutting the workpiece,
A ruler device for positioning the processed portion will be explained.

This ruler device protrudes to the front of the workpiece when feeding the workpiece in order to contact the longitudinal end surface of the workpiece and determine its position, and also retracts from there when clamping is completed and cutting begins. Configure it to do so. That is, reference numeral 15 is a rotating arm having an abutment piece 16 attached to its tip, and this arm has its root end pivotally supported on a horizontal bearing metal 17 provided on the horizontal bed 2.

A hydraulic cylinder 18 is connected to the free end of the rotary arm 15 with the piston rod 18a facing upward, and when the piston rod 18a is extended, the abutment piece 16 is projected upward and the lower side of the workpiece is I try to face the front side. Further, when the piston rod 18a is retracted, the abutment piece 16 is retracted downward from there.

Here, the abutting piece 16 is connected to the rotating arm 1.
5 is screwed and held, and the position can be adjusted in the front and back direction.The attachment position of the workpiece to the rotary cutter, which will be described later, can be finely adjusted, and the root face of the cutting surface during machining can be set as required. do.

The details of the clamp device that presses and fixes the workpiece at a predetermined position and the ruler device that sets the mounting position of the workpiece have been described above.

Next, a cutting device provided corresponding to the clamp device will be explained.

Reference numeral 21 is on the rear side of machine base 1 (left position in Figure 1)
This machine frame 21 has a pair of vertical frames 21a and 21b on both sides, which are erected on the machine frame 1.
and a cross beam 21c connecting the upper ends of these vertical frames 21a, 21b, forming a gate shape. Then, vertical guides 22, 22 are arranged inside each of the vertical frames 21a, 21b, and a substantially rectangular support plate 2 is provided on the guides 22, 22.
3 can be raised and lowered freely.

Further, the horizontal beam 21c supports a pair of feed screw shafts 24, 24 facing downward and freely rotatable, and the feed screw shafts 24, 24 are fixed to the upper end of the support plate 23 with a nut cylinder 25, 25, and adjust the vertical position of the support plate 23 by rotating the support plate 23. An electric motor _M1 is connected to the feed screw shafts 24, 24 via transmission gear means 26, 26 and an interlocking shaft 27 provided at their respective upper ends;
The above-mentioned elevation adjustment is performed by controlling the forward and reverse rotation of the electric motor _M1 .

Next, a large circular concave hole 28 is bored in the center of the support plate 23, and a circular rotary plate 29 is rotated in this concave hole 28 via a support member and a rotational drive mechanism, which will be described later. Be prepared at will.

That is, the support member is attached to the corner 4 of the support plate 23.
It is composed of trochanters 30 disposed at certain locations, and these trochanters 30 abut against the outer circumferential surface of the rotary disk 29 . Further, the rotational drive mechanism includes a gear 31 carved on the outer peripheral surface of the rotary disk 29, and an intermediate gear 32 connected to the gear 31.
The pinion 33 and this gear 3 linked via
Electric motor _M2 with reducer fixed to the output shaft
The rotating disk 29 is rotated at a constant speed in the direction indicated by the arrow Q in FIG. 2 by driving the electric motor _M2 . The electric motor _M2 is equipped with an electrical rotational speed variable means, and the rotational speed is set appropriately.

In addition, a straight and wide recessed hole 34 is bored in the center of the rotary disk 29, and a pair of linear guides 35 are provided on the inner wall of the recessed hole 34 in parallel to the diametrical direction of the rotary disk 29.
will be established. A holding body 36 is slidably engaged with this linear guide 35, and a cutting head is attached to this holding body 36, and a rotary plate 29 is attached to the cutting head.
It is equipped with a pressing operation mechanism that presses toward the center of the cylinder.

First, the pressing operation mechanism will be explained. This mechanism uses a hydraulic cylinder 3 disposed in the recessed hole 34.
7, its piston rod 37a
is tied to the holder 36, and the cylinder tube 37b is tied to the peripheral end of the rotating disc 29. When the piston rod 37a is retracted, the holder 36 is moved toward the center of the rotary disk 29, and when the piston rod 37a is extended, it is moved away from the center.

Further, an oil supply/discharge throttle means (not shown) is connected to the hydraulic cylinder 37, and the moving speed of the holding body 36 is adjusted as appropriate.

Next, in the cutting head, first, a bearing sleeve 38 is attached and fixed to the movable body 36, and a spindle 39 is rotatably supported on this bearing sleeve 38. and,
One end of the spindle 39 is placed forward (right side in Fig. 1).
A rotary cutter 40 is attached to the distal end of the cutter. In addition, a gear 41 is fixed to the other end,
An electric motor is connected to this gear 41 via a pinion 42.
Connect M ₃ .

Here, the rotary cutter 40 uses a cutter having a conical cutting edge, and the slope (corner angle) of the cutter determines the groove angle that can be cut. Therefore, various types of milling cutters are available depending on the beveling angle to be cut, and they are replaceable.

Further, a copying rotor 43 having a size approximately equal to the minimum diameter of the rotary cutter 40 is attached to the end of the spindle 39 immediately before the rotary cutter 40 so as to be freely rotatable. The copying roller 43 comes into contact with the outer peripheral surface of the workpiece to determine the cutting position of the rotary cutter 40 when the cutting head is pressed toward the center.

Next, in FIG. 2, reference numeral LS ₁ is a limit switch associated with the dock 44 of the rotary disk 29. This limit switch LS ₁ controls the rotational movement of the rotary disk 29 and its stop position, and starts cutting. Set the cutting position of the cutting head at the time of cutting.

Incidentally, in this embodiment, when the cutting head moves toward the center, it is set so that the direction is downward. Further, reference numeral LS ₂ is a limit switch that detects that the cutting mechanism is in the retracted position, and the limit switch LS ₂ confirms the completion of the cutting process and stops driving the various actuators such as the electric motor and the hydraulic cylinder.

Reference numeral 45 is a balance weight having a weight equivalent to the weight of the cutting head, and this balance weight 45 and the bearing cylinder 38 of the cutting head are connected to the chain 4.
At the same time, this chain 46 is hung on sprockets 47, 47 to balance the two.

Now, in order to perform a required beveling process on the outer peripheral edge of a square steel pipe using the beveling device configured as described above, first, a rotary cutter 40 having a required bevel cutting angle is attached to the spindle 39. Then, the trochanter 43 is pivotally supported following its tip. Rotating cutter 4
0 has been installed, next conveyor device C
The upper workpiece is fed onto the receiving surface 3a of the guide rail 3 in the clamping device, and its tip is abutted against the protruding abutment piece 16 to position it.

As described above, once the tip machining position of the workpiece is determined, the contact piece 16 is retracted downward, and the workpiece is pinched from the left and right by the pair of vise pieces 4a and 4b on both sides, and further pressed. It is firmly clamped by pressing from above with the plate 11.

In this case, the center of the workpiece in the left-right direction exactly coincides with the center of the rotary disk 29 by the centripetal vice pieces 4a and 4b.

Furthermore, when the workpiece is set as described above and the rotary cutter 40 is cut from above, the outer peripheral edge of the workpiece has the required root face R and bevel angle as shown in FIG. The positions of each part and the contact piece 16 are set in advance so that θ is removed.

In addition, the adjustment of the root face R in the above is performed by adjusting the abutment piece 16 back and forth, but the amount of adjustment at that time is determined based on a conversion table using the thickness of the processed material, the bevel angle, and the root face as specifications. It is convenient to do so. Further, this conversion table can also be displayed on the contact piece 16 as a dimension display scale.

After the above operations are completed, the vertical center of the workpiece is aligned with the center position of the rotary disk 29.

This operation is performed by moving the support plate 23 upward or downward under the control of the electric motor _M1 . When set in this way, the rotary cutter and the When the copying trochanter is displaced along with the rotation of this rotary plate 23,
The pressing force can be directed to the center of the workpiece. In other words, it acts in the center direction on any of the peripheral edges, that is, the top and bottom, left and right sides, and the four corners.

Once the various parts have been set, the pressing operation mechanism is operated with the rotary cutter 40 rotated, and the cutting head is first moved toward the center of the rotary disk 29. In this way, the cutter 40 cuts along the outer edge of the center portion of the upper side of the workpiece until the trochanter 43 comes into contact with it, and this cut portion forms a desired bevel shape.

When the cutting operation of the rotary cutter 40 is completed, the rotary drive mechanism is operated while the pressing operation mechanism remains in operation, and the rotary disk 29 is rotationally driven in the direction of arrow Q in FIG. In this way, the pressing operation mechanism allows the copying roller 43 to always roll in pressure contact with the outer periphery of the workpiece, and to accurately follow not only flat sides but also rounded corners. In this state, the edges can be cut using a rotating cutter. Then, by one revolution of the rotary disk 29, the required beveling process can be uniformly performed on the edge of the workpiece.

In addition, this bevel processing device is equipped with a balance weight 45 that balances the load applied to the cutting head, so that, for example, cutting can be performed with the same pressing force on both the upper and lower sides, allowing high-precision cutting in a stable state. can be done.

As is clear from the above description of the embodiments, the beveling device of the present invention is equipped with a support plate on the machine base, and a rotary plate that is rotatably operated by a rotary drive mechanism is attached to the machine base via the support plate. Further, the rotary disk is provided with a linear guide in the diametrical direction of the rotary disk,
A cutting head is slidably engaged with this linear guide, and a pressing operation mechanism for moving the cutting head in the direction of the linear guide is associated with the cutting head. This rotary cutter is equipped with a profiling rotor that aligns with the rotational axis and contacts the outer circumferential surface of the workpiece, and uses the profiling cutting method to perform high-precision beveling along the outer circumferential surface of the square steel pipe. It has the excellent effect of being able to perform automatically and efficiently.
Furthermore, since the present invention uses a conical rotating cutter, the correspondence between the cutter and the workpiece can be easily changed by regulating the position of the end face in the longitudinal direction of the workpiece using a ruler device. This has the effect that the groove can be formed into a desired shape.

In addition, in the present invention, by operating the cutting head directly in the direction of the center of rotation using the pressing operation mechanism, the copying trochanter is directly brought into contact with the outer circumferential surface of the workpiece. Operations are grouped into the same system, allowing for a simple configuration.

Further, the present invention has a mechanism for adjusting the height of a rotary plate equipped with a cutting head, so that the cutting head can be pressed toward the center of the workpiece of any size, and The effect is that machining can be smoothly performed with uniform cutting force.

Note that the present invention is not limited to the above-mentioned embodiment, but can also be embodied in the following manner.

(a) When the workpiece material is a round steel pipe,
The configuration of the clamping device should be modified accordingly to accommodate this material.

(b) The entire clamping device should be constructed so that it can be moved and adjusted in the front-back direction, so that the amount of bevel can be adjusted while the workpiece material is being clamped.

(c) The conveyor rollers and conveyor device should be actively driven to automatically carry in and out the material to be processed, and also to automatically bring the edge of the material into contact with the ruler device.

(d) Two or more cutting heads are provided and these cutting heads are operated simultaneously to improve machining efficiency.

(e) When two cutting heads are provided in symmetrical positions and are operated simultaneously, they should be operated by the same pressing operation mechanism to simplify the configuration.

(f) Use a torque motor, an electric motor equipped with a torque limiter mechanism, etc. as the push operation mechanism.

(G) Injecting fluid (liquid, air) for removing chips near the rolling part of the copying trochanter to prevent erroneous copying operations.

(H) When beveling a square steel pipe, when the cutting head approaches the four corners of the workpiece,
A detection means (for example, a limit switch) is provided to detect this, and the rotational speed of the rotary plate is decelerated by a certain distance or a certain period of time based on this detection signal, thereby correcting the machining speed.

(li) A speed adjustment means shall be provided to automatically adjust the rotation speed of the rotary plate according to the size of the workpiece material.

[Brief explanation of drawings]

The drawings show an embodiment of the beveling apparatus for square steel pipes and the like according to the present invention. FIG. 1 is a partially longitudinal side view showing the overall configuration, and FIG. 2 is a view taken along line X-X in FIG. 1. Figure 3 is a front view of the cutting device shown by cutting at
FIG. 4 is a front view of the clamping device seen from the Y-Y direction in the figure, and is an explanatory diagram of the beveling state. 1: Machine stand, 2: Horizontal bed, 3: Guide rail, 4a, 4b: Vice piece, 8a, 8b: Support column,
9: Cross beam, 10: Hydraulic cylinder, 11: Pressing plate,
12: Lifting adjustment means, 14: Conveying roller, 15:
Rotating arm, 16: Contact piece, 18: Hydraulic cylinder, 21: Machine frame, 21a, 21b: Vertical frame, 21
c: Cross beam, 23: Support plate, 24: Feed screw shaft, 2
5: Nut tube, 28: Recessed hole, 29: Rotating disc, 3
0: Trochanter, 34: Concave hole, 35: Straight guide, 3
6: Holder, 37: Hydraulic cylinder, 38: Bearing tube, 39: Spindle, 40: Rotating cutter, 4
3: Imitation trochanter, 45: Balance weight, 46:
Chain, 47: Sprocket, M ₁ , M ₂ , M ₃ :
Electric motor, LS ₁ , LS ₂ : limit switch,
C: Conveyor device.

Claims (1)

[Scope of Claims] 1. The machine base is equipped with a support plate, and the machine base is provided with a rotary plate that is rotated by a rotary drive mechanism via the support plate, and furthermore, the rotary plate is provided with a rotating plate that is rotatably operated by a rotary drive mechanism. A linear guide in the diametrical direction of the disk is provided, a cutting head is slidably engaged with the linear guide, and a pressing operation mechanism is associated with the cutting head to move the cutting head in the direction of the linear guide. Further, the cutting head is provided with a conical rotary cutter and a copying rotor that coincides with the axis of the rotary cutter and comes into contact with the outer circumferential surface of the workpiece, and
A beveling device for square steel pipes, etc., characterized in that a ruler device is provided on the longitudinal end face of the workpiece to set the corresponding position of the workpiece with respect to a rotary cutter. 2. A clamping device for centripetally clamping the workpiece material is provided on one side of the machine base, and a support plate is provided on the other side of the machine base in correspondence with this clamping device, and the vertical position of the support plate can be adjusted freely. A rotary plate is provided on the machine base via a support plate and is rotatably operated by a rotary drive mechanism, and a linear guide in the diametrical direction of the rotary plate is provided on the rotary plate, and cutting is performed on this linear guide. The head is slidably engaged, and
A pressing operation mechanism for moving the cutting head in the linear guide direction is associated with this cutting head, and the cutting head is further provided with a conical rotary cutter and a cone-shaped rotary cutter that is aligned with the axis of the rotary cutter and that is aligned with the workpiece. A rectangular steel pipe, etc., characterized in that a copying trochanter is provided in contact with the outer peripheral surface, and a ruler device is provided on the longitudinal end face of the workpiece to set the corresponding position of the workpiece with respect to the rotary cutter. Bevel processing equipment.