JP2594494B2 - Method and apparatus for forming longitudinal slits in inorganic fiber hollow cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic cutting method for continuously cutting a hollow cylindrical body made of inorganic fiber, which is mainly used as a heat insulating cylinder, in a longitudinal direction for expanding the hollow cylindrical body into an approximately ω shape for construction. The present invention relates to an improvement in a method and an apparatus for forming a film.

[0002]

2. Description of the Related Art A method and an apparatus for forming a continuous slit in a longitudinal direction for expanding a hollow cylinder made of inorganic fiber mainly used as a heat retaining cylinder are disclosed in Japanese Patent Application Laid-Open No. 61-44.
No. 594 and West German Patent 2,132,843 are known.

The means disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 61-44594 is a method in which a heat retaining cylinder is moved in the longitudinal direction, and a slit which reaches a half of the thickness from the inner peripheral surface and the inner and outer peripheral surfaces extend over the entire thickness. The Z-shaped cross-section that has been cut by cutting is simultaneously cut by a large number of blades.

This means is based on the fact that only the cutting edge is present in the hollow portion of the heat retaining cylinder and the supporting cylindrical body on the inner peripheral surface is not present, and the entire cutting is simultaneously cut by a large number of cutting blades. There is a problem that resistance is large and deformation in the radial direction due to distortion of the heat retaining cylinder or compression deformation occurs at a cut portion. When a thin heat retaining cylinder having a small inner diameter is processed, the quality tends to deteriorate.

[0005] Also, in the specification of West German Patent No. 2132843, a supporting cylinder having two cutting blades is provided in an axial direction of a heating cylinder, although a supporting cylinder having an inner peripheral surface is present in a hollow portion of the heating cylinder. It is a means to move and cut the upper and lower slits at the same time, so it is not possible to process a long heat insulation cylinder and not only productivity is low, but also the cutting resistance when cutting by pushing the support cylinder There is a problem that compression deformation occurs at the cut portion.

[0006]

DISCLOSURE OF THE INVENTION The present invention reduces the cutting resistance at the time of cutting of a slit formed in a hollow cylindrical body made of inorganic fiber, balances the cutting force at the time of cutting, and further reduces the hollow force during processing. It is an object of the present invention to provide a method and an apparatus capable of forming a high-quality cut without causing twisting or the like of a cylindrical body.

[0007]

According to a first aspect of the present invention, as a first step, a hollow cylindrical member made of inorganic fiber is slid along a supporting cylindrical member inserted into a hollow portion. While moving, a first slit is cut in the normal direction at a depth not reaching the outer peripheral surface from the inner peripheral surface.

Next, as a second step, the normal line in the hollow cylinder portion symmetrical with respect to the first cutting line is positioned at a bisector, and a sector having an angle with the center of the hollow cylinder as an apex is set. A second cut is made in the normal direction from the outer peripheral surface of the hollow cylindrical body at the one end position to reach half the thickness of the hollow cylindrical body.

Next, as a third step, a third slit is cut in the normal direction from the inner peripheral surface of the hollow cylinder at the other end of the sector to reach half the thickness of the hollow cylinder.

[0010] Subsequently, as a fourth step, the step of connecting the second and third cut ends with a fourth cut notch parallel to a tangential direction of the hollow cylindrical body is performed. The configuration is such that the operation is performed continuously as the hollow cylindrical body slides along the body.

According to the second aspect of the present invention, the hollow cylindrical body is formed along the guide plate having the same shape as the second, third and fourth slits provided between the support cylindrical body and the machine base. A configuration of sliding was added.

According to a third aspect of the present invention, there is provided a support cylinder for sliding a hollow portion of an inorganic fiber hollow cylinder along an outer peripheral surface for implementing the first invention. A first cutting blade, which protrudes in the normal direction and has a cutting edge in the length direction of the support cylinder, is fixed to the upstream side in the direction.

[0013] Further, on the downstream side in the sliding direction of the hollow cylindrical body on the symmetrical side of the hollow cylindrical body part on which the first cutting blade protrudes,
The normal line, which is the projecting direction of the first cutting edge, is located on a bisector, and in the normal direction of one side end position of a sector having the vertex at the center of the support cylinder, the machine base moves to the support cylinder. A second cutting blade protruding toward the supporting cylinder and having a cutting blade in the length direction of the support cylinder is fixed.

Further, a third cutting blade projecting in the normal direction and having a cutting edge in the length direction of the supporting cylinder is fixed to the supporting cylinder at the other end of the sector. An interval in the length direction of the support cylinder was formed between the front end of the second cutting blade and the rear end of the second cutting blade.

The third cutting blade has a downstream portion in the sliding direction facing a plane where the second cutting blade is located,
A fourth cutting edge having a cutting edge which is substantially orthogonal to the cutting edge line position of the second cutting edge and faces the upstream side in the sliding direction was integrally connected.

In addition, the support cylinder is fixed to a guide plate protruding from the machine base on the downstream side in the sliding direction in the same phase as the fixed phase of the second, third and fourth cutting blades. It was made the configuration that did.

According to a fourth aspect of the present invention, the first, second and third cutting blades are fixed to the supporting cylinder so that the height of the projection in the normal direction can be adjusted. Added the configuration that

According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, the cross-sectional shape of the guide plate orthogonal to the lengthwise direction of the support cylinder is changed to the second, third and fourth cross-sections in the orthogonal cross section. Is added to the configuration in which the shape matches the vertical projection of each cutting edge.

[0019]

According to the first and third aspects of the present invention, the hollow cylinder is slid along the support cylinder inserted into the hollow portion and is supported from the inside. Even when it receives, it does not deform inward and can stably hold the shape of the hollow cylinder.

Each of the first, second, and third cuts is made in the normal direction, and the first cut position is bisected by the angle formed by the second and third cut positions. By being on the line, the cutting resistance acting on the hollow cylindrical body is balanced, and no external force biased on the hollow cylindrical body is acted on, so that the position of each split is accurate.

Further, since the cutting by the second, third and fourth cutting blades is performed at intervals in the longitudinal direction of the hollow cylinder, the cutting resistance at the time of cutting is dispersed, and a large cutting locally occurs in the hollow cylinder. Prevent resistance from acting.

Since the fourth cutting edge is connected integrally with the third cutting edge, the position of the second parallel cutting edge parallel to the continuous tangent line is accurately regulated.

With the addition of the second and fifth aspects of the present invention, the second, third and fourth slits slide along the guide plate, so that the hollow cylindrical body is prevented from being twisted during machining. .

According to the fourth aspect of the present invention, the cutting depth corresponding to the change in the thickness of the hollow cylindrical body can be adjusted, so that the cutting device can be provided with versatility.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 11, a method and an apparatus according to the present invention comprise a hollow cylindrical body 1 made of a laminate of inorganic fiber mats such as glass fibers and frequently used as a heat insulating cylinder.
A first slit 4 in the normal direction from the inner peripheral surface 2 to the outer peripheral surface 3 to a substantially half depth, and a hollow cylindrical body portion on the symmetric side with respect to the first slit 4 The normal is positioned on the bisector AA, and the normal in the normal direction reaching the middle of the thickness from the outer peripheral surface 3 at one end position of the sector having an angle with the center O of the hollow cylinder 1 as the vertex. A second slit 5 and a third normal in the normal direction reaching half of the thickness from the inner peripheral surface 2 at the other end of the sector.
And a method and apparatus for cutting a fourth cut 7 parallel to a tangent connecting the cut ends of the two split cuts 5, 6.

FIGS. 1 to 10 show claims 3 and 4.
FIG. 5 shows an apparatus which is an example of an embodiment to which the inventions of claims 5 and 6 are applied. Since the inventions of claims 1 and 2 are implemented by using this apparatus, the configuration of the apparatus is changed. The structure of the method according to the first and second aspects of the present invention will be described together with the description.

The support cylinder 8 shown in FIG. 1 and FIG.
The hollow cylindrical body 1 is inserted into the hollow portion 9 of the hollow cylindrical body 1 shown in FIG. 11 and slides in the direction of arrow B along the outer peripheral surface 10, and is fixedly supported on the machine base 12 by the guide plate 11. Have been.

A first cutting edge 13 is fixed to the support cylinder 8 on the upstream side in the sliding direction indicated by the arrow B so as to protrude in the direction of the normal line C.

As shown in FIG. 1, the first cutting edge 13 has a cutting edge line 14 formed over the entire length thereof.
Is tapered at an angle of 5 to 15 degrees, preferably 11 degrees, toward the lower side on the upstream side in the sliding direction B.

As shown in FIGS. 2 and 3, the first cutting blade 13 is inserted into a mounting groove 15 cut in the normal direction of the support cylinder 8, and is fixed by a group of fixing bolts 16. Have been.

The first cutting edge 13 has a plurality of long grooves 17 formed upward from the lower side. A small diameter portion 18 at the tip of a fixing bolt 16 is fitted into the long groove 17. By loosening, the vertical position is adjusted. In FIG. 3, reference numeral 19 denotes a loose fitting hole of the small diameter portion 18.

On the downstream side in the sliding direction B of the support cylinder portion on the symmetrical side of the portion of the support cylinder 8 where the first cutting blade 13 protrudes, the first cutting blade 13 protrudes. A direction normal is positioned on the bisector DD, and the supporting cylinder 8
In the normal direction of the position of one side end 21 of the sector 20 having the center P as the apex, it faces from the machine base 12 to the support cylinder 8, and FIG.
As shown in FIGS. 2 and 4, the second cutting blade 22 is fixed.

As shown in FIGS. 1 and 5, the second cutting edge 22 also has a cutting edge line 23 formed over the entire length, and the cutting edge line 23 is in the same direction as the cutting edge line 14 of the first cutting edge 13. Are tapered at the same angle.

As shown in FIGS. 1 and 2, the second cutting edge 22 is fixed to a fixing arm 24 of the guide plate 11 by a fixing bolt 2.
There are a plurality of long grooves 26 fixed in five groups and formed upward from the lower side. The position in the vertical direction is adjusted by loosening the fixing bolt 25.

The cutting position 27 of the first cutting blade 13 into the hollow cylinder 1 and the cutting position 28 of the second cutting blade 22 into the hollow cylinder 1 are, as shown in FIG. In the length direction of 8, there is an interval L before and after.

A third cutting blade 30 is fixed to the support cylinder 8 at the other end 29 of the sector 20 so as to protrude in the normal direction.

As shown in FIG. 7, the third cutting edge 30 has a cutting edge line 31 in the longitudinal direction of the support cylinder 8, and the cutting edge line is angled upward on the upstream side in the sliding direction B. It is tapered about 20 degrees.

As shown in FIG. 4, the third cutting edge 30 is also fitted into a mounting groove 32 cut in the normal direction of the support cylinder 8, as shown in FIG. It has the same structure as the first cutting edge 13 and is fixed by a group of fixing bolts 33 so that the position in the vertical direction can be adjusted.

Between the cutting position 34 of the third cutting blade 30 into the hollow cylinder 1 and the rear end 35 of the second cutting blade 22, an interval M in the longitudinal direction of the support cylinder 8 is provided. Is formed, and the length of the gap M is selected to be 5 to 100 mm, preferably 10 to 60 mm.

The uppermost end 36 of the second cutting blade 22 and the third
The lowermost end 37 of the cutting blade 30 in FIG.
And 2 to 5 in the vertical direction as shown in FIG.
It is fixed so as to have an overlap N of about mm.

As shown in FIG. 4, a second cutting blade 22 is provided on the downstream side of the third cutting blade 30 in the sliding direction B.
, The fourth cutting edge 38 that is substantially orthogonal to the top edge 36 of the second cutting edge 22 at the position of the cutting edge line 23.
Are integrally connected to the third cutting blade 30 as shown in FIG.

As shown in FIGS. 7, 8 and 9, the fourth cutting blade 38 is formed such that the entire cutting blade is tapered toward the upstream side in the sliding direction B.

The cutting position 39 of the fourth cutting edge 38 is located at a position spaced apart from the cutting end position 40 of the third cutting edge 30 by a distance R toward the downstream in the sliding direction as shown in FIG. It has been.

The guide plate 11 fixed to the machine base 12 is
The cross-sectional shape conforming to the vertical projection of each of the second, third and fourth cutting blades 22, 30, and 38 on a cross section orthogonal to the longitudinal direction of the support cylinder 8 is formed as shown in FIG. The distal end 41 is inserted into a mounting groove 42 cut out of the support cylinder 8 and is fixed with a group of fixing bolts 43. With this fixation, the support cylinder 8 is fixedly supported on the machine base 12.

The guide plate 11 also has the same structure as the third cutting blade 30, so that the fixing position of the support cylinder 8 is adjusted in the vertical direction by the group of long slots 44, and the second cutting blade 22 and the third cutting blade 30 are adjusted. And the fourth cutting blade 38 are adjusted to the adjusted positions.

Since the guide plate 11 has the above-mentioned cross-sectional shape, each of the first, second, third and fourth cutting blades 1 is formed.
The hollow cylindrical body 1 cut by the cuts 3, 22, 30, and 38 passes through the guide plate 11 at the cut portions formed by the cutting blades 22, 30, and 38 when sliding as shown by the arrow B. Is taken out of the apparatus.

The angle θ of the sector 20 shown in FIG.
The angle is selected to be 20 degrees, and this angle is good for fitting of the split portion when the hollow cylindrical body 1 formed with the split is returned from the expanded position to the cylindrical position, and good resilience to the cylindrical shape. At the same time, the workability of the fixing work of each cutting blade is also an angle that is good.

The dividing device to which the third, fourth, and fifth aspects are applied has the above-described configuration, and the invention of the first and second aspects is implemented by this apparatus as follows. .

That is, a support cylinder 8 having a diameter smaller by 1 to 1.5 mm than the inner diameter of the inner peripheral surface 2 of the hollow cylinder 1 is selected.
After adjusting each of the cutting blades to a protrusion height adapted to the thickness of the hollow cylinder 1, the hollow cylinder 1 is fitted into the support cylinder 8 in the sliding direction B direction.

Next, when the hollow cylindrical body 1 is grasped from both sides and is slid in the direction of arrow B, the first cutting edge 13 is first directed from the inner peripheral surface 2 to the outer peripheral surface 3 until the thickness is approximately halfway. A first slit 4 is cut in the line direction.

When the first cutting edge 13 cuts to the deepest portion of the first slit 4, the symmetrical second cutting edge 22 moves from the outer peripheral surface 3 to the inner peripheral surface 2 in the normal direction. Then, the second slit 5 is cut to the middle of the thickness.

When the second cutting edge 22 cuts to the deepest portion of the second cutting edge 5, the third cutting edge 30 moves from the inner peripheral surface 2 to the outer peripheral surface 3, and the third cutting edge 6 is cut. Cut in the normal direction.

When the third cutting edge 30 cuts to the deepest part of the third cutting edge 6, the fourth cutting edge 38 is moved to the end of the second cutting edge 5 and the third cutting edge 6. The space is cut in the tangential direction to form a fourth cut 7, and the second cut 5 and the third cut 6 form an inverted Z-shaped cut.

When the cutting edge on the upstream side in the sliding direction cuts to the deepest part, the cutting of the next cutting edge on the downstream side is started. Therefore, the cutting resistance is reduced for each cutting edge. In addition, the cutting resistance is dispersed in the longitudinal direction and the circumferential direction of the hollow cylindrical body 1 and does not concentrate on one local portion of the hollow cylindrical body 1, so that the cutting resistance of each cutting blade can be suppressed low.

The first, second and third cutting blades 13, 2
The cutting direction of the second and third cutting edges 22 and 30 is a normal direction, and particularly, the cutting direction of the second and third cutting blades 22 and 30 is a two normal line in which the cutting direction of the first cutting edge 13 is placed on a bisector. Since the cutting direction is the same as the cutting direction, the cutting force accompanying the cutting keeps a state of equilibrium with the hollow cylinder 1 and the respective cutting blades, and no external force biased on the hollow cylinder 1 is applied.

The cutting by the cutting blade described above is performed continuously from the front end to the rear end over the entire length of the hollow cylindrical body 1, but the second, third, and fourth cuts 5, 6 ,
Immediately after being cut, 7 is inserted into a guide plate having the same longitudinal sectional shape and is slid and guided, so that the hollow cylindrical body 1 does not twist during processing, and high-quality processing is performed. Done.

According to the third and fifth aspects of the invention, the smooth and highly efficient implementation of the first and second aspects of the invention is guaranteed.

According to the fourth aspect of the present invention, if the inner diameter of the hollow portion of the hollow cylindrical body 1 is the same, the hollow cylinders having different wall thicknesses can be adjusted only by adjusting the protruding height of the cutting blade. , A predetermined slit can be formed.

[0059]

According to the first and third aspects of the present invention, a hollow cylindrical body formed of a laminate of inorganic fiber mats is cut from the inner and outer peripheral surfaces for assembly to a pipe or the like. The cutting resistance at the time of cutting with a cutting blade such as a cutting parallel to the tangent line in the wall thickness can be separately performed at different positions in the longitudinal direction and the circumferential direction of the hollow cylindrical body. Therefore, there is an effect that the cutting resistance at each of the cut portions is kept small, and the deformation of the hollow cylindrical body due to the slit formation can be prevented.

Each cutting from the inner and outer peripheral surfaces of the hollow cylindrical body is performed in the normal direction, and the ends of the normal cutting from the outer and inner peripheral surfaces are parallel to the tangential direction. From the inner peripheral surface to the outer peripheral surface formed in the hollow cylindrical body part symmetrical to the substantially inverted Z-shaped slit connected by the rib, the slit reaching the middle of the wall thickness of the cylindrical body, Since it is formed on the bisector of the angle formed by the two normal-direction cuts forming a substantially inverted Z-shaped cut, the cutting force at the time of cutting each cut is hollow. An effect is exerted on the cylinder in a balanced manner so that the hollow cylinder does not undergo any deformation due to the biased external force.

According to the second and fifth aspects of the present invention, the sliding direction of the hollow cylindrical body along the outer peripheral surface of the supporting cylindrical body is regulated by the guide plate of the supporting cylindrical body. Thus, the twisting of the hollow cylindrical body caused by the above can be prevented, and an effect that high quality processing can be performed is achieved.

Further, according to the invention of claim 4, as long as the inner diameter of the hollow portion of the hollow cylindrical body is the same, a plurality of hollow cylindrical bodies having different wall thicknesses can be divided by a single cutting device. Only by adjusting the protruding height of each cutting blade, there is an effect that a cut can be formed.

In spite of the above-mentioned effects, the invention of each claim has effects that the process and the mechanism are simple, productivity is improved, and high-efficiency and high-quality processing can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of an apparatus in which each of the third, fourth, and fifth aspects of the present invention is implemented.

FIG. 2 is a scaled side view of what is shown in FIG.

FIG. 3 is a sectional view taken along line XX in FIG. 2;

FIG. 4 is a sectional view taken along line YY in FIG. 2;

FIG. 5 is a side view of a second cutting blade.

FIG. 6 is an S-view rear view of the one shown in FIG. 5;

FIG. 7 is a side view of a third cutting blade.

FIG. 8 is a rear view as viewed from T of FIG. 7;

FIG. 9 is a plan view of the one shown in FIG. 7;

FIG. 10 is a sectional view taken along the line ZZ in FIG. 2;

FIG. 11 is a front view of a hollow cylindrical body that has been cut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow cylindrical body 8 Support cylindrical body 9 Hollow part 10 Outer peripheral surface 11 Guide plate 12 Machine base 13 1st cutting blade 20 Sector 21 1 side end 22 2nd cutting blade 23 Cutting edge line 29 Other side end 30 3rd cutting Blade 34 Cutting position of third cutting blade 35 Rear end of second cutting blade 36 Uppermost end of cutting edge 23 38 Fourth cutting blade B Sliding direction C Normal line DD Bisection line M Interval P Center of the support cylinder QQ Plane where the second cutting edge is located

Claims (5)

(57) [Claims] 1. A first slit having a depth that does not reach an outer peripheral surface from an inner peripheral surface while sliding a hollow cylindrical member made of inorganic fibers along a support cylindrical member inserted into a hollow portion. Is cut in the normal direction, and then the normal line in the hollow cylinder portion symmetrical with respect to the first slit is located at a bisector, and one side of the sector having an angle with the center of the hollow cylinder as the apex. From the outer peripheral surface of the hollow cylindrical body at the end position, a second slit reaching half the thickness of the hollow cylindrical body is cut in the normal direction, and then from the inner peripheral surface of the hollow cylindrical body at the other end position of the sector. A third slit that reaches half the thickness of the hollow cylindrical body is cut in the normal direction, and then the second and third cuts are made.
The step of connecting between the cut ends of the hollow cylindrical body with a fourth cut notch parallel to the tangential direction of the hollow cylindrical body is continuously performed along with the sliding of the hollow cylindrical body along the support cylindrical body. A method for forming a longitudinal slit in a hollow fiber body. 2. The hollow cylindrical body is slid along a guide plate having the same shape as the second, third, and fourth slits provided between the support cylindrical body and the machine base. 2. The method for forming a longitudinal slit of an inorganic fiber hollow cylindrical body according to item 1. 3. A supporting cylinder for sliding a hollow portion of an inorganic fiber hollow cylinder along an outer peripheral surface, wherein the supporting cylinder protrudes in a normal direction on an upstream side in a sliding direction of the hollow cylinder, and has a length corresponding to a length of the supporting cylinder. A first cutting edge having a cutting edge in the vertical direction is fixed, and a downstream side in the sliding direction of the supporting cylinder body on the symmetrical side of the supporting cylindrical body portion protruding from the first cutting edge, In the normal direction of one side end position of a sector having a normal line, which is a projecting direction of the first cutting edge, located on a bisector and having a vertex at the center of the support cylinder, the support cylinder is disposed from the machine base. A second cutting edge having a cutting edge in the length direction of the support cylinder is fixed to the support cylinder, and the support cylinder at the other end of the fan shape projects in the normal direction to the support cylinder. A third cutting edge having a cutting edge in a body length direction is fixed, and a support cylinder body length is set between a tip of the third cutting edge and a rear end of the second cutting edge. The third cutting edge is formed at a downstream portion of the third cutting edge in the sliding direction, facing a plane where the second cutting edge is located, and having a cutting edge of the second cutting edge. A fourth cutting edge having a cutting edge which is substantially orthogonal at a line uppermost position and has a cutting edge facing the upstream side in the sliding direction is integrally connected, and the support cylindrical body includes the second, third, and third cutting edges. 4. A device for forming a longitudinal slit of an inorganic fiber hollow cylindrical body fixed to a guide plate protruding from the machine base on the downstream side in the sliding direction in the same phase as the fixed phase of each cutting blade. 4. The hollow cylindrical body made of inorganic fiber according to claim 3, wherein each of the first, second and third cutting blades is fixed to the supporting cylindrical body so that the height of projection in the normal direction can be adjusted. For forming longitudinal slits. 5. A cross-sectional shape of the guide plate orthogonal to the length direction of the support cylinder, the cross-sectional shape conforming to the vertical projection of each of the second, third, and fourth cutting blades on the orthogonal cross-section. Item 3
5. The apparatus according to claim 4, wherein the slit is formed in the longitudinal direction of the inorganic fiber hollow cylindrical body.