JPH0890328A - Precise shearing machine of pipe work - Google Patents

Abstract

PURPOSE: To provide a shearing machine simple in structure and capable of securing a high precision sectional end being equal to that to be securable through a shearing method by a rotary tool only when it is attached to the conventional metalforming machine tool. CONSTITUTION: A rotary presser mechanism 2 of a pipe work W and a fixed side tool 3 being adjacent to this rotary presser mechanism 2 and having a hole 30 inserting through the side of a remainder of the pipe work W both are installed in a base to be secured to the side of a press bed, and an eccentric rotator rotatably holding a movable side tool 5 with a hole 50 inserting through an off-cut side of the pipe work W and having a gear 44 on the circumference is installed in the adjoining position of this fixed side tool 3. In addition, a rack 45 receiving a thrust of a press ram (b) is slidably set up in and around this eccentric rotator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe material shearing device, and more particularly to a pipe material precision shearing device using a rotary tool.

[0002]

BACKGROUND OF THE INVENTION Synthetic resin pipe materials and metal pipe materials typified by aluminum and steel are increasingly used as piping materials, reinforcing materials and forging materials for various products. is there. Such a pipe material is required to have a highly accurate cut surface without large irregularities in addition to being less likely to be deformed such as being crushed. A shearing method using a rotary tool is known as a method for precisely shearing a pipe material while maintaining high productivity, and representative ones thereof are JP-B-53-24192 and JP-B-55-3.
Japanese Patent No. 6446 and Japanese Patent Publication No. 63-52916 are proposed. These methods apply a relative rotational motion between a fixed-side tool that relatively fixes the pipe material and the moving-side tool, and at the same time, gradually increase the biting of the moving-side tool to the pipe material. Is a method of shearing with a pair of tools. However, in the prior art, when this method is carried out, an expensive shearing machine or device for exclusive use including a power source such as a hydraulic motor or a hydraulic cylinder for rotating a tool is required, which causes an increase in processing cost. It was difficult to use the pipe material for shearing.

The present invention was devised to solve the above problems, and its purpose is to obtain a shearing method using a rotary tool simply by mounting it on a conventional press machine such as a single-acting crank press. An object of the present invention is to provide a simple shearing device having a structure capable of obtaining a highly accurate cut surface as high as the cut surface to be cut.

[0004]

In order to achieve the above object, the first invention of the present invention is to provide a rotary pressing mechanism for a pipe material on a base fixed to the press bed side, and to adjoin the rotary pressing mechanism. A fixed-side tool having a hole for inserting the retainer side of the material is provided, and a movable-side tool having a hole for inserting the off-cut side of the pipe material is rotatably held at the position adjacent to the fixed-side tool and is provided on the outer periphery. Is provided with an eccentric rotating body having a gear, and in the vicinity of the eccentric rotating body, a rack which meshes with the gear and receives thrust of a press ram is slidably mounted. Further, in the second aspect of the present invention, a rotary pressing mechanism for a pipe material is provided on a base fixed to the press bed side, and a fixed side tool having a hole which is adjacent to the rotary pressing mechanism and has a hole for inserting the retainer side of the pipe material is provided. , An eccentric rotating body that rotatably holds a moving side tool having a hole for inserting the off-cut side of the pipe material is provided at a position adjacent to the fixed side tool, and the eccentric rotating body extends outward and extends upward. Is a fixed base of the arm facing the press ram.

[0005]

In the first aspect of the invention, when the press ram is lowered, the rack is pressed and moves in the axial direction, whereby the gear meshed with the rack is rotated. Since this gear is integrated with the eccentric rotating body and the moving tool is held by the eccentric rotating body, the hole center point O ′ of the moving side tool is in agreement with the hole center point O of the fixed side tool. It is converted into a motion (eccentric rotary motion) of rotating the tool on the moving side around the hole center point 0 ₁ . As the relative rotation angle of the tool increases, the amount of tool biting into the material increases [radius (1/2) · Kmax (K
Since max is the maximum tool bite amount into the pipe material 6 when θ = 180 °], the material is separated as the rotation angle increases. Therefore, the cut surface properties are good, and since the load required for shearing can be reduced, precise shearing can be performed with less deformation near the cut surface. According to the second aspect of the invention, when the press ram is lowered, the upper part of the arm is pressed, so that the arm is tilted and the eccentric rotating body is rotated at the same time, and the hole center point O ′ of the moving side tool is the same as in the first aspect. The state in which it coincides with the hole center point O of the fixed side tool is converted into a motion (eccentric rotation motion) of rotating around the hole center point 0 ₁ of the movable side tool, and rotational shearing is performed. This second invention is the first
Although the rotation angle is smaller than that of the invention by about 90 °, in the case of a material such as a thick material or a hard material which is easily cracked, it is possible to shear with sufficient precision by this method.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show an embodiment of the first invention. Reference numeral 1 denotes a base fixed to a bed or a bolster a of a press machine, and a pipe material rotary pressing mechanism 2, a fixed side tool 3, and a moving side tool mechanism 4 are sequentially arranged from the upstream side to the downstream side in the material feeding direction. An arbitrary pipe material feeding means 6 such as a roll type is provided upstream of the pipe material rotary pressing mechanism 2. The pipe material rotary pressing mechanism 2 is a means for fixing the pipe material W to the fixed side tool 3. In order to obtain a highly accurate cut surface, it is necessary to firmly fix the pipe material W to the fixed-side tool 3 during shearing. The pressing force for fixing the pipe material W to the fixed-side tool 3 without rotating is slightly different depending on the material of the pipe material, the wall thickness, the roughness of the outer surface of the pipe material, etc., but is about 10% of the maximum shear load.
The above is necessary. However, if the pipe pressing force is too large, the pipe material W is damaged or crushed, so 10 to 20% of the maximum shear load is optimal.

The pipe material rotary pressing mechanism 2 may have any structure as long as it can apply such an optimum pipe pressing force. In this embodiment, in order to have a compact and simple structure, the reaction force of the elastic body is used. That is, as shown in FIGS. 1 and 2, the block-shaped holder 20 fixed to the base 1 is provided with a tapered hole 21 which is narrowed toward the upstream side, and the tapered hole 21 has a tapered surface on the outer circumference. Plural (two in the drawing) presser pieces 22, 22 are slidably inserted. The pressing pieces 22, 22 have a concave pressing surface 22 corresponding to the outer surface shape of the pipe material W on the inner diameter side.
Has 0. An elastic body 23 typified by a spring is interposed between the axial ends of the pressing pieces 22 and 22 and the rear ends of the tapered holes.
By biasing 22 toward the smaller diameter side of the tapered hole 21, the pressing pieces 22, 22 are brought closer to each other so that the pipe material W is gripped. Although the receiving plate 200 of the elastic body 23 is fixed to the holder 20 in this embodiment, it may be omitted in some cases, and the holder 31 of the fixed-side tool 3 to be described later may be omitted.
The elastic body 23 may be directly supported by.

The fixed-side tool 3 is formed as a ring having a hole 30 having a diameter equal to or slightly larger than the outer diameter of the pipe material W, and is provided on a block-shaped holder 31 fixed to the base 1. It is fitted in the mounting hole 32. The hole 30 of the fixed-side tool 3 needs to be concentric with the tapered hole 21. The moving-side fixed tool mechanism 4 is first fixed to the base 1 and has a block-shaped housing 40, 40 'having a lateral hole 400 penetrating in the axial direction, and a bearing such as a metal bush 42, 4 fitted in the lateral hole 400, 400.
It has an eccentric rotary body 41 which is rotatably held around a horizontal axis via the shaft 2. The eccentric rotating body 41 is the center
(Axis OL) has a cylindrical shape that penetrates an eccentric hole 410 that is displaced from the center (axis O'L) of the fixed side tool 3 by a required dimension, and is formed in an eccentric hole 410, especially in an area near the fixed side tool 3. The movable side tool 5 forming a pair with the fixed side tool 3 is attached via a bearing 43. The moving-side tool 5 is configured as a ring having a hole 50 penetrating the same as or slightly larger than the outer diameter of the pipe material W, and faces the end surface of the fixed-side tool 3 with a slight clearance.

A gear having a required number of teeth, for example, a pinion 44 is detachably fixed to the outer periphery of the eccentric rotating body 41 via a key 43, and a recess 10 for allowing the rotation of the gear 44 is formed in the base 1. It is provided. On the other hand, base 1
Is provided with a guide block 40 ″ in a direction orthogonal to the axis of the eccentric rotating body 41.
A rack 45 that meshes with the gear 44 is slidably inserted vertically. The upper surface of the rack 45 is a ram of a press machine
Facing b (including slide) and guide block 4
The lower part is supported by a cushion means such as a spring 46 arranged on the bottom of the 0 ″ or the base 1, so that the center of the movable side tool 5 and the center of the fixed side tool 3 are normally aligned.

The optimum eccentricity [(1/2) · Kmax)] of the movable tool 5 with respect to the fixed tool 3 must be set to an optimum value depending on the material and wall thickness of the pipe material. That is, for example, in the case of a hard pipe material such as S58C, cracks are generated and grow when the tool bites into the pipe material to a small extent, and material separation is performed, so that the maximum tool biting amount (Kmax) at θ = 180 ° is It is necessary to set a small eccentricity amount, and in the case of a soft pipe material such as resin or aluminum, the tool digging amount for causing material separation becomes large, so conversely it is necessary to set a large eccentricity amount. There is. If the eccentricity is too small in the shear of a hard pipe material, the deformation (crushing) or unevenness near the cut surface becomes large, and in the case of a soft pipe material, if the eccentricity is too small, the pipe material cannot be completely separated. This is because processing defects occur. According to this embodiment, the key 43 is removed to release the coupling between the gear 44 and the eccentric rotating body 41. Therefore, the eccentric rotating body 41 and the moving-side tool 5 assembled to the eccentric rotating body 41 are extracted, and the desired eccentricity is obtained. By replacing the eccentric rotating body 41 with a certain amount and attaching the moving side tool 5,
The optimum amount of eccentricity can be easily set for each pipe material.

4 and 5 show an embodiment of the second invention. In this second invention, the eccentric rotation angle of the moving tool 5 is 90 °.
Even in the following cases, it is a suitable mode for hard materials and thick materials that can obtain a cut surface with small deformation (crush) and unevenness, and since it is not necessary to use racks and pinions, it is possible to have a simpler structure and low cost. Can be realized. Also in this second invention, the pipe material rotary pressing mechanism 2, the fixed side tool 3 and the moving side tool mechanism 4 are sequentially arranged on the base 1, and the pipe material rotary pressing mechanism 2, the fixed side tool 3 and the moving side tool mechanism 4 are arranged. The main configuration of is the same as that of the first invention. Therefore, the same parts and the same parts are designated by the same reference numerals, and the description thereof is omitted. Second
In the present invention, the arm 7 is detachably fixed to the outer periphery of the eccentric rotating body 41 by a rotation stop pin or the like, the free end side of the arm 7 extends outside the housing 40, 40 ', and the base end side thereof is a spring or the like. Of the ram b by being pulled to the base or housing by the pull-back means 70 of
Is set to a required inclination facing each other, so that the center of the movable side tool 5 and the center of the fixed side tool 3 are normally aligned with each other. The arm 7 is tilted at a tilt angle in the vicinity of 90 ° as indicated by the imaginary line in FIG.
At this time, an arc surface 71 is formed on the upper part of the arm 7 so that a smooth motion can be obtained, and the holder 8 is provided on the ram b.
The pressing roller 80 is rotatably attached via the.

It is to be noted that what is shown in the drawings is an embodiment of the present invention, and other modes are not prohibited. That is,
The pipe material rotary pressing mechanism 2 is provided with a semicircular groove in the holder 20 at a position corresponding to the pipe material feed line, and a pressing block having the semicircular groove is arranged on the upper side through an elastic body such as a spring,
A structure may be employed in which the pressing block is provided with a protrusion that receives the descending force transmitted from the ram a. The rack 45 may be connected to the ram b via a shim or a spacer depending on the case. Further, the pipe material feeding means 8 may use a feeder provided in the press machine. The gear 44 may be fixed to the end of the eccentric rotating body 41 instead of the middle thereof in the longitudinal direction. In this case, the arrangement positions of the rack 45 and the guide block 40 ″ are also changed. The same applies to the arm 7. .

[0013]

According to the first and second aspects of the invention, the base 1 may be mounted on the base of an arbitrary press machine such as a single-acting crank press or a single-acting hydraulic press, or the bolster a. The pipe material feeding means 6 inserts the pipe material W into the moving-side tool 5 by the off-cut length at the tip. During this insertion, the presser piece 22,
22 is pressed in the axial direction against the urging force of the elastic body 23 due to the contact with the pipe material W, so that the pressing pieces 22, 22 expand. When the cutting length is inserted, the elastic body 2
By the reaction force of 3, the pressing pieces 22, 22 move to the smaller diameter side of the taper hole 21 and contract again, so that the pipe material W is firmly fixed to the fixed side tool 3. This state is shown in FIG. 6A, and the hole center point O ′ of the movable side tool 5 coincides with the hole center point O of the fixed side tool 3. When the press machine is subsequently operated, the ram a is lowered and the rack 45 is pushed, whereby the gear 44 meshing with the rack rotates.
The gear 44 is integrated with the eccentric rotating body 41, and the moving-side tool 5 is attached to the eccentric rotating body 41 so as to be relatively rotatable. Therefore, as described above, the rotation of the gear 44 causes the moving-side tool 4 to start the eccentric rotary motion around the hole center point 0 ₁ . As a result, the moving-side tool 4 bites into the pipe material W and shearing is started. FIG. 6B shows a state in which the moving side tool 5 has a rotation angle θ of 60 °, and when the ram a increases the descending amount of the rack 45, the rotating angle of the moving side tool 5 increases correspondingly, and the biting is performed. The quantity also increases. FIG. 7 shows the relationship between the rotation angle θ of the moving side tool 5 and the tool biting amount K. Figure 6 (c)
The rotation angle is 120 °, the rotation angle is 180 °, and (d) is the maximum biting amount into the pipe material W at this time. Along with the fact that W is firmly fixed to the fixed side tool 3, it is sheared into a precise and good cut.

When the rotation angle reaches 180 °, the ram a reaches the bottom dead center, moves to the ascending stroke, and is separated from the rack 45.
Since the rack 45 is pushed up by the cushion means 46, the gear 44 is rotated in the reverse direction, and the hole center point O ′ of the eccentric rotor 41 and the moving side tool 5 gradually coincides with the hole center point O of the fixed side tool 3. It is returned to the position. The sheared pipe material W'is inserted from the hole 50 into the hole 410 of the eccentric rotating body 41 by advancing the hype material W for the next cutting.
Extruded into the hole, moved in each shear cycle, and the hole 410
Emitted from. Instead of this, it may be taken out by an appropriate means at the completion of each step.

In the second invention, when the ram a descends, the pressing roller 80 contacts the arc surface 71 of the arm 7, whereby the arm 7 starts tilting clockwise against the pullback means 70. Since the base portion of the arm 7 is connected to the eccentric rotating body 41, the eccentric rotating body 41 and the moving side tool 5 rotate eccentrically as in the case of the first invention, and as shown in FIGS. 6 (a) and 6 (b). Shearing takes place. The state in which the arm 7 is tilted as shown by the phantom line in FIG. 5 is the maximum rotation angle θ of the moving side tool 5, that is, about 9
It is 0 °, and the maximum amount of biting into the pipe material W is at this time. Next, when the ram a moves to the ascending stroke, the arm 7 is tilted counterclockwise by the pulling-back means 70, whereby the eccentric rotating body 41 and the moving side tool 5 return to the initial position.

Using the device of the first invention shown in FIGS. 1 to 3, an outer diameter of 22 mm and an inner diameter of 16 mm (thickness 3 mm)
The vinyl chloride pipe material of No. 1 was sheared under the condition that the core was not used. The shearing conditions are as follows: the relative clearance between the fixed-side tool and the moving-side tool is 0.08 mm, the hole inner diameter of both tools is 0.3 mm larger than the pipe material outer diameter by φ22.3 mm,
The off-cut length was 40 mm. As a result, as shown in FIG. 8, the maximum tool bite amount Kmax at θ = 180 °
Is 6 mm or more, the material can be separated, and the smaller Kmax is, the more accurate the cut surface with less deformation (crush) can be obtained.
At x = 6 mm, a cut surface having a degree of deformation and unevenness similar to that obtained by a conventional rotary tool was obtained. However, it was found that the materials could not be separated under the condition that Kmax was 4 mm. The reason why the material separation is not performed even when Kmax of 3 mm or more is applied to the pipe material is that the material is largely elastically deformed during shearing.

[0017]

According to the first aspect of the present invention, the translational motion of the ram can be converted into an eccentric rotary motion that rotates the hole center point of the moving tool around the rotation center point of the moving tool. It is possible to perform precise shearing of the pipe material simply by attaching it to, and the excellent effect that the structure is simple and can be implemented at low cost is obtained. According to the second aspect, the structure can be made simpler than that of the first aspect, and the excellent effect that the thick vibe material or the hard hype material can be precisely sheared at low cost can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a first invention of the present invention.

2 is a vertical side view of FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a vertical sectional side view showing an embodiment of the second invention of the present invention.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is an explanatory diagram showing a shearing step in stages in the present invention.

FIG. 7 is a diagram showing a relationship between a rotation angle of an eccentric rotary tool and a tool biting amount.

FIG. 8 is an example schematically showing the cross-sectional shape of the cut surface of the pipe material obtained by the present invention in relation to the tool biting amount.

[Explanation of symbols]

 1 base 2 pipe material rotary pressing mechanism 3 fixed side tool 4 moving side tool mechanism 5 moving side tool 7 arm 30 hole 41 eccentric rotating body 44 gear 45 rack 50 hole θ moving side tool rotation angle K tool biting amount W pipe material a Bed or bolster b ram

Claims (3)

[Claims] 1. A base 1 fixed to the press bed side is provided with a rotary pressing mechanism 2 for a pipe material W, and a hole 30 is provided adjacent to the rotary pressing mechanism 2 for inserting the pipe material W on the reinforcer side. An eccentricity is provided in which a side tool 3 is provided, and a movable side tool 5 having a hole 50 through which the off-cut side of the pipe material W is inserted is rotatably held at a position adjacent to the fixed side tool 3 and a gear 44 is provided on the outer periphery. A precision shearing device for pipe material, characterized in that a rotating body 41 is provided, and a rack 45 which meshes with the gear 44 and receives thrust of a press ram b is slidably mounted in the vicinity of the eccentric rotating body 41. 2. A fixed-side tool having a base 1 fixed to the press bed side, provided with a rotary pressing mechanism 2 for pipe material, and having a hole 30 adjacent to the rotary pressing mechanism 2 for inserting the retainer side of the pipe material W. 3 is provided, and a hole 50 through which the off-cut side of the pipe material W is inserted is provided at a position adjacent to the fixed-side tool 3.
Eccentric rotating body 4 rotatably holding a moving side tool 5 having
1. A precision shearing device for pipe material, characterized in that the base portion of the arm 7 is fixed to the outer periphery of the eccentric rotating body 41 and has an upper portion facing the press ram b. 3. The rotation angle of the moving tool is 90 ° or 18
The precision shearing device for pipe material according to claim 1, wherein the precision shearing device is 0 °.