JPH11347835A - Cutter for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a cutter for pipe by which a burr and deformation are not generated at the pipe cutting time and which can reduce the vibration and further feed a cutting edge properly. SOLUTION: This cutter has a vise 21, a base stand 20 and a head 23 supported on the base stand 20 through an elevating means 22. The vise 21 is a chain vise which can support and fix both of the original part of a cut pipe 35 and cut off part and the head 23 has a head main body 24 built in a reduction gear, a disc saw edge 26 fixed to the main shaft 25 of the reduction gear and a motor 27 for driving the disc saw edge 26 through the reduction gear. The elevating means 22 is composed of a screw shaft 43 and guide shaft 44 provided on the head 23, a nut member 45 provided on the base stand 20 and screwed with the screw shaft 43 and a guide cylinder 46 for guiding the guide shaft 44 and constituted so that the head 23 is elevated vertically and also the center of the disc saw edge 26 is installed just above the center of a V block 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe cutting machine. More specifically, the present invention relates to a pipe cutting machine capable of preventing burrs and deformation at the time of cutting a pipe, reducing vibration, and capable of appropriately feeding a blade.

[0002]

2. Description of the Related Art Two examples of a conventional cutting machine are shown in FIG. In FIG. 1A, a swing arm having a handle 2 is provided on a base 1 so as to be swingable, and a disk saw blade 4 that is driven to rotate by a motor 3 on the swing arm, and covers the saw blade. A cover 5 and a lower guard 6 are provided. The base 1 is provided with a flat vise 10 including a fixed part 7, a movable part 8, and a screw shaft 9 for pressing the movable part.
When cutting an object to be cut, the object to be cut is fixed by a vise 10 and the handle 2 is pressed down to cut by the rotating disk saw blade 4. The cutting machine shown in FIG. 2B has the same main configuration as that shown in FIG.

[0003]

The above conventional cutting machine has the following problems. First, FIG. 7 (a)
As shown in (b), only one side is clamped by the vise 10 with respect to the cut surface 11a of the pipe 11, so at the end of cutting, the pipe 11b on the unclamped side is cut off by its own weight as shown in FIG. Is done. At that time, the cut surface 11
Burrs 12 occur on a. The burrs 12 require a repair operation to be removed by sanding or the like. In addition, there is a problem that the cut pipe is caught in the blade 4 and chipping easily occurs.

Second, when the pipe 11 is clamped, since the vise 10 is of a flat vise type, the pressing force concentrates on two opposing points of the pipe, and as shown in FIG. Clamps, there is a problem that the pipe 11 is permanently deformed and becomes elliptical.

Third, as shown in FIG. 8 (b), the cutting tool 4 is fed to the pipe 11 in the rotational direction about the fulcrum 13 where the cutting tool 4 is located. 1
4 and the down cut portion 15, and since the amount is non-uniform, there is a problem that the vibration is large and the blade is easily consumed.

Fourth, since the cutting of the blade is performed by adjusting the force of the hand holding the handle 2, there is a problem that the blade is chipped if the blade is pressed too hard, and the cutting time will be long if the blade is too weak.

The present invention has been made in view of the above-mentioned conventional problems, and realizes a pipe cutting machine capable of preventing burrs and deformation at the time of cutting a pipe, reducing vibrations, and performing proper blade feeding. The purpose is to:

[0008]

According to a first aspect of the present invention, there is provided a base 20 having a vise 21 for holding a pipe to be cut.
And a head portion 23 supported on the base 20 via a lifting / lowering means 22. The vise 21 supports and fixes both the original portion 35a of the pipe 35 to be cut and the cut-off portion 35b. A head vise, which has a built-in speed reducer.
A disk saw blade 26 fixed to the main shaft 25 of the speed reducer,
A motor 27 for driving a disc saw blade 26 via a speed reducer; the elevating means 22 includes a screw shaft 43 and a guide shaft 44 provided on a head portion 23; It comprises a nut member 45 screwed to the shaft 43 and a guide tube 46 for guiding the guide shaft 44. The head portion 23 is vertically moved up and down, and the center of the disk saw blade 26 is at the center of the V block 36. It is characterized by being arranged right above.

With this configuration, since both the original portion and the cut-off portion of the pipe to be cut can be held by the chain vise, deformation of the pipe to be cut and generation of burrs can be prevented. In addition, since the center of the disk saw blade is directly above the center of the V-block, when cutting the pipe to be cut, the amount of up-cut and down-cut is the same and vibration is reduced.

A second aspect of the present invention is characterized in that an ammeter 29 capable of measuring a current flowing in a motor 27 for driving the disk saw blade 26 is provided. By adopting this configuration, the overload can be monitored by the ammeter, so that an optimum feed speed can be given to the disc saw blade.

[0011]

1 and 2 show an embodiment of a pipe cutting machine according to the present invention. FIG. 1 is a perspective view seen from the right side, and FIG. 2 is a perspective view seen from the left side. It is. In this embodiment, a base 20 on which a vise 21 is formed and a base 2
And a head 23 supported at 0 through the lifting means 22.

The head 23 has a handle 24 at the top.
a head body 24 having a. The head body 24 has a built-in speed reducer, and a disk saw blade 26 is attached to a main shaft 25 of the speed reducer. A motor 27 for driving the disk saw blade 26, a power switch 28 for turning on and off the motor 27, and an ammeter 29 for measuring a current flowing through the motor are provided. Reference numeral 26a is a blade cover that covers the disk saw blade 26.

As shown in the sectional view of FIG. 3, the speed reducer includes a spur gear 31 meshed with a small gear 30a formed on a motor shaft 30, a shaft 32 supporting the spur gear, and a shaft 32 formed on the shaft 32. And a worm gear 33 meshed with the worm 33a. The worm gear 33 is fixed to the main shaft 25.

A vise 21 provided on the base 20 is provided.
Is a chain vise, and two sets are provided so as to support both the original portion and the cut-off portion of the pipe to be cut. As shown in the perspective views of FIGS. 1 and 2 and the sectional views of FIGS. 3 and 4, the chain vise includes a V block 36 for supporting a pipe 35 to be cut, and a V block 3.
6, a chain 37 for pressing and fixing the pipe to be cut 35 mounted on the V-block 36, an L-shaped lever 38 having a hook 38a for hooking the chain 37, a shaft 39 for supporting the lever 38, and a return spring 40,
It comprises clamp handles 41 and 41 'for rotating the lever 38 and pulling the chain 37. The chain 37
Has one end 37a fixed to the base 20 and the other end has a gripping ball 42
Is installed.

The V-block 36 of the vise 21 is connected to the original portion 3 of the pipe 35 to be cut as shown in the sectional view of FIG.
3 to clamp the _{5a (35- 1 ~35 -3,)} , 2 pieces to be Kuranbu portions 35b cut off (35 _-4,
35 _-5) are formed respectively, the chain 37 is two to be Kuranbu the original portion of the cutting pipe, one to be Kuranbu portions cut off are provided.

The L-shaped lever 38 for pulling the chain for clamping the original portion of the pipe to be cut has two hooks, and the L-shaped lever 38 for pulling the chain for clamping the cut-off portion of the pipe to be cut has one hook. A hook is provided, and a hook 3 of each L-shaped lever 38 is provided.
8a is disposed between the V block 36 and the V block 36, and is a lever 38 for fixing the original portion of the pipe to be cut.
Is a first clamp handle 41, and a lever 38 for fixing a cut-off portion is driven by a second clamp handle 41 '.

As shown in FIG. 3, the head elevating means includes a screw shaft 43 and a guide shaft 44 provided on the head portion 23, and a nut provided on the base 22 and screwed to the screw shaft 43. The head 23 is vertically moved up and down, and the center of the disk saw blade 26 is located directly above the center of the V-block 36, and the disk 45 is formed of a member 45 and a guide cylinder 46 for guiding the guide shaft 44. The plane portion of the saw blade 26 is disposed so as to be perpendicular to the row direction of the V blocks 36.

As shown in FIG. 5, two guide shafts 44 are provided to prevent the head portion 23 from swinging.
It is slidably fitted on a guide cylinder 46 provided on the base 20. A bevel gear 47 is fixed to one end of the screw shaft 43, the portion is rotatably supported by the head main body 24 by a bearing 48, and the screw portion is a nut member 4 provided on the base 20.
5 is screwed. A bevel gear 49 meshing with the bevel gear 47 is supported by a horizontal shaft 50, and a feed handle 51 is provided on the shaft 50.

The operation of the embodiment constructed as described above will be described with reference to FIGS. First, the V block 36
The pipe 35 to be cut is placed on the
7 to turn the piece of the chain 37 into the hook 3 of the lever 38.
8a, the lever 38 is pressed by the clamp handles 41, 41 ', and the lever 38 is rotated about the shaft 39 to apply tension to the chain 37 to fix the pipe 35 to be cut on the V block 36. I do.

Next, the power switch 28 is turned on, the motor 27 is rotated, and the disk saw blade 26 is rotated via the speed reducer. Then, the pipe 35 to be cut can be cut by the disc saw blade 26 by rotating the screw shaft 43 by rotating the feed handle 51 of the elevating means 22 and lowering the head portion 23.

At this time, since the pipe 35 to be cut is pressed from substantially the entire circumference by the chain 37 of the chain vise and the V block 36, there is no deformation. Further, since the cut-off portion is also fixed to the vise, it does not fall under its own weight, so that no burrs are generated and the cut-off is not entangled in the blade. Therefore, there is no occurrence of chipping. Further, since the center of the disc saw blade 26 coincides with the center of the V-block 36 and descends vertically, the amount of up-cut and down-cut becomes equal, so that vibration is reduced, and the life of the blade can be extended. .

When the head 23 is lowered, the current flowing through the motor 27 is monitored by an ammeter 29, and if the head 23 is lowered so as not to cause an overcurrent, the head 23 can be covered at an optimum feed speed without waste. The cutting pipe 35 can be cut. Thereby, the life of the blade can be improved.

[0023]

According to the pipe cutting machine of the present invention, since both the original portion and the cut-off portion of the pipe to be cut can be held by the chain vise, deformation of the pipe to be cut and generation of burrs can be prevented. be able to. In addition, since the center of the disk saw blade is directly above the center of the V-block, when cutting the pipe to be cut, the amount of up-cut and down-cut is the same and vibration is reduced. Further, since the overload can be monitored by the ammeter, the optimum feed speed can be given to the disk saw blade, and the life of the blade can be extended.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention as viewed from the right.

FIG. 2 is a perspective view of the embodiment of the present invention as viewed from the left.

3A and 3B are diagrams showing an embodiment of the present invention, wherein FIG. 3A is a longitudinal sectional view, and FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a partially cutaway view of FIG.

FIG. 6 is a perspective view showing two examples of a conventional cutting machine.

FIG. 7 is a diagram for explaining a problem to be solved by the invention.

FIG. 8 is a diagram for explaining a problem to be solved by the invention.

[Description of Signs] 20 ... Base 21 ... Vise 22 ... Elevating means 23 ... Head part 24 ... Head body 25 ... Spindle 26 ... Disc saw blade 27 ... Motor 28 ... Power switch 29 ... Ammeter 30 ... Motor shaft 31 ... Flat gear 32 ... shaft 33 ... worm gear 34 ... main shaft 35 ... to be cut pipe 36,36- ₁ ~36- ₅ ... V block 37 ... chain 38 ... lever 40 ... return spring 41 ... clamp handle 42 ... grip balls 43 ... screw shaft 44: Guide shaft 45: Nut member 46: Guide cylinder 47, 49: Bevel gear 48: Bearing 51: Feed handle

Claims (2)

[Claims] A vice for holding a pipe to be cut;
And a head portion (23) supported on the base (20) via elevating means (22). The vice (21) is A chain vice capable of supporting and fixing both the original portion (35a) and the cut-off portion (35b) of the pipe (35), wherein the head portion (23) is a head body (24) having a built-in reduction gear; A disc saw blade (26) fixed to the main shaft (25) of the speed reducer; and a motor (27) for driving the disc saw blade (26) via the speed reducer. ) Are a screw shaft (43) and a guide shaft (44) provided on the head portion (23), and a base (20).
A nut member (45) screwed into the screw shaft (43) and a guide cylinder (4) for guiding the guide shaft (44).
6), wherein the head portion (23) is vertically moved up and down, and the center of the disk saw blade (26) is disposed right above the center of the V block (36). Characteristic pipe cutting machine. 2. An ammeter (29) capable of measuring a current flowing in a motor (27) for driving the disc saw blade (26).
The pipe cutting machine according to claim 1, wherein a cutting machine is provided.