JP2995389B2 - Flexible tube cutting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible tube formed by spirally winding a metal band for use in a piping hose called a silencer for absorbing oil pulsation in a power steering mechanism of an automobile. The present invention relates to a method for cutting a flexible tube for improving quality by eliminating the possibility that foreign matters such as cutting chips and grinding chips generated when cutting the flexible tube adhere to the flexible tube.

[0002]

2. Description of the Related Art Conventionally, as a method for cutting a flexible tube, there has been used a grinding process in which a rotating disk-shaped grindstone is brought into contact with the flexible tube to cut the flexible tube. Grinding with this grindstone has the advantage that the processing speed is high and cutting can be performed quickly.

[0003]

However, in the above-described conventional method for cutting a flexible tube,
At least the flexible tube corresponding to the thickness of the disc-shaped grindstone is scraped off to become metal powder, and a certain amount of abrasive grains in the grindstone fall off and scatter during grinding. The metal powder of the flexible tube and the abrasive grains of the grindstone may adhere to and remain in the flexible tube. Furthermore, since the burrs that easily fall off the cut surface of the flexible tube due to the grinding process, it has been necessary to perform the deburring polishing process again to remove the burrs. And there is a possibility that the removed burrs may remain as metal pieces in the flexible tube.

[0004] If these remaining foreign substances such as metal powder and abrasive grains flow through a power steering hose mounted on an automobile, the hydraulic device of the power steering mechanism will be disturbed. In the process, a careful washing operation or the like is performed in order to remove the foreign matter, and an inspection for confirming the removal of the foreign matter has to be performed. Then, it is extremely difficult to completely remove the foreign matter once attached to the flexible tube. Therefore, according to the present invention, not only a high-quality flexible tube free from the possibility of adhering foreign matter can be obtained, but also steps for removing the foreign matter and detecting the foreign matter are not required, and the man-hour for cutting the flexible tube is reduced. An object of the present invention is to provide a method for cutting a flexible tube which can greatly contribute to the above.

[0005]

In order to achieve the above-mentioned object, a flexible tube cutting method according to the present invention is used for a piping hose for absorbing a pulsation of oil in a power steering mechanism of an automobile. In the method of cutting a flexible tube formed by being wound around, an outer peripheral shape in which a concave blade portion is formed on the outer periphery with respect to the flexible tube and abuts inside the flexible tube
It said flexible tube inserted through the rod-shaped inner cutter consisting of a facing side of the point corresponding to the edge portion of the inner cutter in the flexible tube periphery is brought into contact in the cradle, corresponding to the blade portion of the inner blade An outer blade provided with a blade portion is disposed at an outer peripheral position of the flexible tube, and the flexible tube is cut by engaging the blade portion of the inner blade with the blade portion of the outer blade.

The cutting angle between the blade portion of the inner blade and the blade portion of the outer blade is made parallel to the axial direction of the flexible tube, and the width of the blade portion of the inner blade and the outer blade is spirally wound. The width of the metal tube in the axial direction of the flexible tube may be used.

Further, both blades may be engaged with each other in a state where the cutting angle of the blade of the inner blade and the blade of the outer blade is inclined with respect to the axial direction of the flexible tube.

[0008] or a method of cutting the flexible tubes used in the hose which absorbs pulsation of the oil in an automobile power steering mechanism, a flexible form a blade portion concave single-edged structure circumferentially on the outer circumference with respect to the flexible tube Outer circumference contacting inside the tube
A plurality of single-blade outer blades, each of which is provided with a blade portion corresponding to the outer circumference of the blade portion of the inner blade in a divided shape while penetrating the rod-shaped inner blade having the shape, are formed in a circular shape around the outer circumference of the flexible tube. And cutting the flexible tube by one bite of the plurality of outer blades and the blade portion of the inner blade.

[0009]

1 to 3 show a first embodiment of a method for cutting a flexible tube according to the present invention.
FIG. 4 shows a flexible tube 1 formed by spirally winding two metal strips, a metal strip 2 having a semicircular cross section and a metal strip 3 having a substantially triangular cross section. Reference numeral 4 denotes a metal cylindrical inner blade having a blade portion 5 having a concave stepped single-blade structure formed at the tip, and 6 denotes a metal metal blade provided from the lower portion of the blade portion 5 of the inner blade 4 to one side thereof. The pedestal 7 is an outer blade which is disposed above the blade portion 5 of the inner blade 4 so as to be vertically movable, and has a blade portion 8 having a one-blade structure which engages with the blade portion 5 of the inner blade 4 at one end. .

The cradle 6 has a substantially L-shaped cross section and a concave portion 6a having substantially the same curvature as the outer periphery of the flexible tube 1 is formed in a horizontal plane near the inner angle so as to closely engage the outer periphery of the flexible tube 1. , Is fixedly set in a press device (not shown). Above the concave portion 6a of the receiving table 6, a blade portion 5 at the tip of the inner blade 4 is provided with a gap substantially equal to the thickness of the metal band of the flexible tube 1.

The inner blade 4 has its base end fixed to a base 9,
The length from the base end to the tip of the inner blade 4 is not less than the maximum length of the desired flexible tube, and its outer diameter is slightly smaller than the inner diameter of the flexible tube 1 so that the flexible tube 1 can be inserted freely. I do. As shown in FIG. 2, a stopper member 10 with which the distal end of the flexible tube 1 to be inserted abuts is disposed in the middle part of the inner blade 4, and the stopper member 10 is movably provided on the outer periphery of the flexible tube 1. By fixing, the cutting position of the flexible tube 1 can be set freely.

The outer blade 7 is driven by the press device so as to be movable up and down. As shown in FIG. 3, the blade 8 of the outer blade 7 engages with the blade 5 of the inner blade 4 when the outer blade 7 is lowered. Set to work. Also, by making the step at the blade portion 5 of the inner blade 4 substantially the same as or slightly larger than the thickness of the metal band of the flexible tube 1, the flexible tube can be cut by engaging with the blade portion 8 of the outer blade 7. I can do it. Furthermore, the width of the blade 5 of the inner blade 4 and the width of the blade 8 of the outer blade 7 are substantially the same as the width of the two metal bands in the axial direction of the flexible tube (the spiral around which the metal band is wound). (Depending on the angle), the cutting length is not excessively short or short, and the flexible tube 1 can be reliably cut by a single operation with the press device, and the adjacent metal band is cut unnecessarily. Nor.

The method for cutting a flexible tube according to the present invention having the above-described structure will be described below. First, when cutting the flexible tube 1 to a length of, for example, 300 mm, the position of the stopper member 10 is set to 300 mm from the tip of the inner blade 4 and fixed with screws or the like. The set dimension may be printed and marked on the outer periphery of the inner blade 4 as a scale.

Next, the long flexible tube 1 wound in a roll shape is pulled out, and its tip is inserted from the tip of the inner blade 4 until it comes into contact with the stopper member 10.
And the blade part 8 of the outer blade 7 is
After rotating the flexible tube 1 while visually checking to match the width of the metal strip of the book, the pressing device is driven to engage the blade 5 of the inner blade 4 and the blade 8 of the outer blade 7 so as to form two pieces. Is cut off, whereby the flexible tube 1 is cut off.

Even if a large force is applied to the flexible tube 1 by the pressing device at the time of this cutting, the concave portion 6a is formed in the receiving base 6, so that the flexible tube 1 is stably held by the receiving base 6 without escaping. And it is surely cut. And the cut flexible tube 1 is
It is withdrawn from the inner blade 4 and sent to the next step.

The flexible tube 1 cut in this manner is cut in a shearing manner by a pressing device, so that there is no shortage of metal powder or burrs that easily fall off due to conventional grinding. Only a burr remains on the cut surface of one flexible tube 1. Furthermore, since there is no problem in the state of use even if the short burrs are left attached to the end face, there is no need to go through a deburring step or a foreign substance inspection step, and the number of manufacturing steps can be greatly reduced.

In the above-described embodiment, the cutting angle between the blade portion of the inner blade and the blade portion of the outer blade is parallel to the axial direction of the flexible tube. However, the cutting angle is not necessarily limited to this parallel cutting angle. The cutting angle of each blade is determined with respect to the axial direction of the flexible tube, as long as the two metal strips can be cut by one bite of each blade of the inner blade and the outer blade. It may be inclined. However, in this case,
It is necessary to make the cutting angles of the inner blade and the outer blade coincide with each other so as to bite both blades. Further, in order to cut the flexible tube suitably, each blade of the inner blade and the outer blade is required. It is desirable that the portion is formed in an arc shape corresponding to the cross-sectional shape of the flexible tube that abuts.

[0018] Figure 5 shows a second embodiment of the cutting method of the flexible tube of the present invention, the inner cutter 4 to be inserted into the flexible tube 1 comprises a cylindrical, its blade portion 5 in FIG. 8 As shown, it is formed in a stepped shape on the outer periphery of the inner cutter 4 in a circular shape. In addition, the inner blade 4 of this one-blade structure
Similarly provided with a outer blade ₇₁ of the single-edged _structure, 7 ₂ blade unit 8 arc-shaped 180 degree in which the blade portion 2 divided shape corresponding to the outer periphery of the blade portion 5 of the inner cutter _4, 82 to bite and , Each of which is vertically opposed to each other so as to orbit the outer periphery of the flexible tube 1 in a direction perpendicular to the axial direction of the flexible tube 1, and is driven by a press device so as to be simultaneously movable up and down in opposite directions. You.

[0019] Then, when cutting the flexible tube 1, so that the outer cutter _{71, 7 2} of the blade section _{81, 82} to each other is not possible to abut the outer blade ₇ 1, ₇ machinery ₂ strokes It is provided with a stopper portion ₇ 1 a, _{7 2} a to be set to both sides of the blade portion _{81, 82.} Thus, when the flexible tube 1 having fitted the inner cutter 4 outer blade ₇ 1, _{7 2} slide into cut from the top and bottom, the outer blade ₇ 1, _{7 2} of the blade section _81,
8 When ₂ and the cutting edge portion 5 of the inner cutter 4 cuts the flexible tube 1 by occlusal almost simultaneously, a stopper portion _{71 a} of the outer blade ₇₁ and outer blade 7 ₂ of the stopper portion 7 _{2 a} is in contact with ,
The outer blade 7 _1, 7 ₂ are prevented from moving more than a stroke required for cutting.

[0020] Figure 9 is a variation of the inner cutter 4 of Figure 8 described above, and a blade portion 5 similarly single-edged structure. Figure
9 has a structure in which the step 11 of FIG. 8 is eliminated. Since the inner blade 4 in FIGS. 8 and 9 has a single blade structure,
The flexible tube can be cut without waste without generating chips.

FIGS. 6 and 7 show the blade portion of the outer blade 2
This is a variation of the second embodiment in which the inner blade 4 is inserted into the flexible tube 1 and has a cylindrical shape, and the blade portion 5 has the same shape as that of the second embodiment described above. Is formed in a stepped portion 11 formed on the outer periphery. And In the embodiment of FIG. 6, the outer blade 7 _1, 7 _2, 7 ₃ which bite the inner cutter 4, the circumferential edge portion corresponding to the outer periphery of the blade portion 5 of the inner blade member 4 is divided into three comprising a 120-degree arc-shaped blade portion 8 _1, 8 _2, 8 ₃ you Jo, and are driven simultaneously center direction or the outer circumferential direction by a press apparatus described above. In addition, the three-part outer blades 7 ₁ , 7 ₂ , 7 ₃
Of both sides of the blade portion _81, 82, _{8 3,} is provided a stopper portion _{7 1 a, 7 2 a,} 7 3 a respectively, a stopper portions of the outer blade is adjacent phase when cutting the flexible tube 1 Abut the outer cutter 7 beyond the stroke required for cutting.
_{1, 7} 2, _{7 3} are prevented from moving.

FIG. 7 shows an embodiment in which the outer blade 7 meshing with the inner blade 4 is used.
_{1, 7 2,} 7 3, _{7 4,} arc-shaped blade portion ₈₁ of 90 degrees to the circumferential edge portion corresponding to the outer periphery of the blade portion 5 of the inner cutter 4 to 4 divided _{form, 8} 2, 8 ₃ and 8 _4, which are simultaneously driven in the center direction or the outer peripheral direction by the above-described press device. Then, these four-part outer blades 7 ₁ , 7 ₂ ,
7 _{3, 7 4} blade portions _{8 1,} 8 _2, 8 3, ₈ on both sides of _4,
Each stopper portion _{7 1 a, 7 2 a,} 7 3 a, 7 4 a
Is provided in contact with the stopper portions of the outer blade is adjacent phase when cutting the flexible tube 1 is brought, the outer blade 7 _1, 7 2, _{7 3,} 7 ₄ are prevented from moving more than a stroke required for cutting .

Although the second embodiment and the variations thereof have been described with respect to the configuration in which the outer cutter is divided into two to four parts, the cutting method of the present invention is not limited to this. Any divisional outer blade such as division or eight division may be used.

In this embodiment, since the flexible tube is formed in a cylindrical shape, the shape of the inner blade is also formed in a corresponding cylindrical shape. However, the present invention is not limited to this. The shape of the inner blade differs depending on the shape of the tube, and any shape may be used as long as it can be inserted closely into the flexible tube.

[0025]

As described in detail above, according to the method for cutting a flexible tube of the present invention, not only a high-quality flexible tube free from the possibility of adhering foreign matter can be obtained, but also foreign matter detection and foreign matter removal. The process according to (1) is not required, which can greatly contribute to a reduction in manufacturing cost of the flexible tube due to a reduction in man-hours. In addition, there is no need for a deburring step or a foreign substance inspection step, etc., which was conventionally required between the flexible tube cutting step and the plating step, and plating and rust prevention can be performed immediately after cutting. There is no danger of rust, abrasive grains, iron powder, and the like, which should not be present, and a higher quality flexible tube can be obtained.

The cutting angle of the inner blade and the outer blade is made parallel to the axial direction of the flexible tube, and the width of the inner and outer blades is spirally wound. When the width of the metal tube in the axial direction of the flexible tube is set, the two metal bands are reliably cut by a single bite of the inner blade and the outer blade, and thus the adjacent metal bands are unnecessarily added. The flexible tube can be efficiently cut without cutting into pieces.

[0027] Alternatively, flexible to form a blade portion concave single-edged structure circumferentially on the outer circumference with respect to the flexible tube
A flexible rod-shaped inner blade having an outer peripheral shape that comes into contact with the inside of the tube is inserted, and a plurality of single-edged outer blades each having a blade portion corresponding to the outer circumference of the blade portion of the inner blade are divided into flexible portions. A high-quality flexible material that is arranged in a circular shape around the outer periphery of the tube and cuts the flexible tube by one bite of the plurality of outer blades and the blade portion of the inner blade so that there is no risk of foreign matter adhering. Not only can a tube be obtained, but also the flexible tube can be cut all around in one round by a single bite between the inner blade and the outer blade by the shearing method, and the two spirally wound tubes can be cut. The flexible tube can be cut at any position without aligning the metal strip with the blade.
Furthermore, since the flexible tube is cut flat without forming a convex portion on the cut surface, when handling the cut flexible tube, there is no danger of fingers being injured by the cut surface of the flexible tube, and work safely. can do.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a flexible tube cutting method according to the present invention.

FIG. 2 is an explanatory view showing a first embodiment of the flexible tube cutting method of the present invention.

FIG. 3 is an explanatory view showing a first embodiment of the flexible tube cutting method of the present invention.

FIG. 4 is a partial cross-sectional view of a flexible tube used in the flexible tube cutting method of the present invention.

FIG. 5 is an explanatory view showing a second embodiment of the flexible tube cutting method of the present invention.

FIG. 6 is an explanatory diagram showing a variation of FIG. 5;

FIG. 7 is an explanatory diagram showing another variation of FIG. 5;

FIG. 8 is an explanatory view showing a second embodiment of the flexible tube cutting method of the present invention.

FIG. 9 is an explanatory diagram showing another variation of FIG. 8 ;

[Explanation of symbols]

1 blade flexible tube 2 metal strip body 3 metal strip member 4 5 blade section 6 receiving base 7 outer blade 7 _{1, 7} 2, ... outer blade 7 _{1 a,} 7 2 a, ... stopper portion 8 blade section 8 ₁ , 8 ₂ ,... Blade 9 Base 10 Stopper 11 Step

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazuo Iso 4-6-40 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Yokohama Airoquip Co., Ltd. Hiratsuka Works (56) References JP-A-4-19008 (JP, A) JP-A Sho 59-192413 (JP, A) JP-A-59-1113 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23D 21/00 B23D 21/00 530 B23D 21/02

Claims (4)

(57) [Claims] 1. A method of cutting a flexible tube formed by spirally winding a metal band used in a piping hose for absorbing pulsation of oil in a power steering mechanism of an automobile, comprising: Forming a concave blade section inside a flexible tube
Insert a rod-shaped inner blade having an outer peripheral shape that comes into contact with, and abut the opposite side of a portion corresponding to the blade portion of the inner blade on the outer periphery of the flexible tube to a receiving table, and to the blade portion of the inner blade. An outer blade provided with a blade portion at an outer peripheral position of the corresponding flexible tube is arranged, and the flexible tube is cut by engaging the blade portion of the inner blade with the blade portion of the outer blade. Cutting method. 2. The cutting angle between the blade portion of the inner blade and the blade portion of the outer blade is made parallel to the axial direction of the flexible tube, and the width diameter of the blade portion of the inner blade and the outer blade is spirally wound. 2. The flexible tube cutting method according to claim 1, wherein the width of the flexible tube in the metal strip is set in the axial direction. 3. The blade according to claim 1, wherein the blades of the inner blade and the outer blade are engaged with each other in a state where the cutting angle of the blade is inclined with respect to the axial direction of the flexible tube. Flexible tube cutting method. 4. A method of cutting a flexible tube for use in hose that absorbs pulsation of the oil in an automobile power steering mechanism, a flexible form a blade portion concave single-edged structure circumferentially on the outer circumference with respect to the flexible tube Is the outer shape abutting inside the tube?
A plurality of single-blade outer blades, each having a blade portion corresponding to the outer circumference of the blade portion of the inner blade, are inserted into the rod-shaped inner blade, and the outer blades of the single-blade structure are formed in a circular shape around the outer circumference of the flexible tube. One of the blades of the plurality of outer blades and the inner blade
A method for cutting a flexible tube, the method comprising cutting the flexible tube with a single bite.