JP6225083B2 - Mold for manufacturing outer tube and method for manufacturing outer tube - Google Patents

Description

  The present invention relates to a mold for manufacturing an outer tube and a method for manufacturing an outer tube by rounding a resin sheet to form an outer tube for a wire harness or the like.

  Conventionally, for example, a corrugated tube made of a synthetic resin has been used as an outer tube of a wire harness for automobiles, and various manufacturing apparatuses (such as molds) and manufacturing methods have been proposed for manufacturing the corrugated tube. .

  For example, in Patent Document 1 (not shown), as an apparatus and method for manufacturing a corrugated tube, a cylindrical divided body having a spiral recess with a predetermined gap formed on the outer periphery of a shaft having a spiral protrusion. Is arranged to form a bellows molding machine, supplying a cylindrical plastic sheet to a predetermined gap while rotating the shaft about the shaft, and continuously forming spiral irregularities on the cylindrical plastic sheet. Yes.

  The cylindrical divided body is arranged in a plurality of loops on both sides in the radial direction of the shaft, and rotates in the axial direction of the shaft (the feeding direction of the plastic sheet) by the rotating body. The edge part of a cylindrical plastic sheet overlaps, and an unevenness | corrugation is formed also in the overlap part. The cylindrical plastic sheet is formed by heating the belt-shaped plastic sheet to a predetermined temperature with a heater and then rolling it into a cylinder with a cylindrical molding machine in order from the front end side of the belt-shaped plastic sheet.

  Patent Document 2 describes a manufacturing apparatus for a corrugated tube shown in FIG. The corrugated tube manufacturing apparatus 61 sends a cylindrical seamless corrugated tube 63 from a drum 62 to a slit forming apparatus 64 and sends a corrugated tube 65 with slits to a lapping apparatus 66 to form an overlap corrugated tube 67. The winding drum 68 is wound up.

  The lapping device 66 includes a cylindrical heating cylinder 69 having a hollow portion (not shown) that is successively tapered in the feeding direction of the slit corrugated tube 65, and a slit corrugated by entering the heating cylinder. And an endless belt-like conveying device 70 for feeding out the tube 65.

  The seamless corrugated tube 63 is formed by continuously extruding a resin material into a cylindrical shape by an extruder (not shown) and continuously forming the seamless tube. The seamless tube is sent to a corrugating machine (not shown) and has a large diameter on the outer surface side of the seamless tube. This is obtained by alternately forming convex portions and small-diameter concave portions in a bellows shape. As a material for the corrugated tube 63, an amide resin such as polypropylene, 6 nylon (registered trademark) or 66 nylon (registered trademark), or a thermoplastic synthetic resin such as polyvinyl chloride or polyethylene is used.

JP-A-6-139860 Japanese Patent Laid-Open No. 2000-246811

  However, in the above-described conventional apparatus and method for manufacturing an outer tube, for example, a continuous cylindrical body is formed by sequentially rounding a synthetic resin sheet in a strip shape from a front end side into a cylindrical shape by a cylindrical molding machine. (Patent Document 1), or a cylindrical seamless corrugated tube 63 (FIG. 14) is continuously sent to the slit forming device 64 to form a continuous slit corrugated tube 65 (Patent Document 2). For example, the manufacturing apparatus 61 is increased in size in the tube feeding direction, and a large space for installing the apparatus 61 in the factory is required, or the manufacturing apparatus 61 is large and complicated, resulting in an increase in cost. There were concerns and concerns that it was not suitable for low-volume production due to continuous molding.

  An object of this invention is to provide the metal mold | die for exterior tube manufacture which can form an exterior tube easily in space-saving, and is suitable also for a small quantity production, and an exterior tube manufacturing method in view of an above-described point.

In order to achieve the above object, a metal mold for manufacturing an outer tube according to claim 1 of the present invention includes a hole having a substantially cylindrical space in a metal block, and an inner peripheral surface of the hole from the outside. A slit that communicates in the tangential direction with the first inner surface that continues to the inner circumferential surface in the tangential direction, and that faces the first inner surface so that the resin sheet can be inserted through the first inner surface. The resin sheet is inserted into the hole from the slit and rounded into a tube shape along the inner peripheral surface of the hole. It is characterized by.

  With the above configuration, for example, a single resin sheet having a size of the developed shape of the outer tube is pushed along the inner peripheral surface of the hole through the slit, and the insertion tip of the resin sheet extends along the inner peripheral surface of the hole. While being guided, the resin sheet is bent in a curved shape along the inner peripheral surface of the hole, and is rounded (wound) to one round or more to be formed into a tube shape. In the case of being rounded more than once, a portion on the insertion tip side of the resin sheet overlaps along the inner surface of the resin sheet.

  By inserting the resin sheets into the hole one by one instead of continuously, small-scale production of the outer tube is facilitated. In addition, the metal block has a slit for inserting the resin sheet and a hole for rounding the resin sheet, so that the structure of the mold for manufacturing the outer tube can be made compact, simplified, and cost-effective. The Further, since a flat resin sheet material is handled, it is not bulky at the time of transportation, and space is saved and transportation workability is improved.

In the outer tube manufacturing mold according to claim 2, a hole having a substantially columnar space and a resin sheet communicating in a tangential direction from the outside to the inner peripheral surface of the hole are inserted into a metal block. slits and is provided, on the inner circumferential surface of the hole, the radius of the inner peripheral surface of the intersection side of the slit rounding direction downstream side of the resin sheet, than the radius of the inner peripheral surface of the other portion The resin sheet is inserted into the hole from the slit and rounded into a tube shape along the inner peripheral surface of the hole.

  With the above configuration, the front end of the resin sheet inserted into the hole portion slides along the inner peripheral surface of the hole portion, and the acute angle between the inner peripheral surface of the hole portion and the slit is just before the end of winding of the resin sheet. When the crossing portion (crossing portion and its vicinity) is reached, the front end of the resin sheet is guided and guided toward the inside in the radial direction of the hole along the small inner peripheral surface of the crossing portion. Thereby, the front end of the resin sheet does not hit the inner surface on the base end side of the resin sheet, and smoothly slides and overlaps along the inner surface on the base end side of the resin sheet. The overlap of the resin tube is performed on the slit side of the mold. By having the overlap portion, the opening of the resin tube is suppressed.

The mold for manufacturing an outer tube according to claim 3 has a metal block in which a hole having a substantially columnar space and a resin sheet communicating in a tangential direction from the outside to the inner peripheral surface of the hole are inserted. slits and is provided, the radius of the inner peripheral surface of the hole portion, is gradually decreased defined in the rounding direction of the resin sheet from the slit, the resin sheet is inserted into the hole portion from the slit, the hole It is characterized by being rounded into a tube shape along the inner peripheral surface of the part.

  With the above-described configuration, the tip of the resin sheet inserted into the hole from the slit gradually passes, for example, from the large-diameter inner peripheral surface of the hole to the medium-diameter inner peripheral surface along the small-diameter inner peripheral surface. It is guided and guided toward the radially inner side. Thereby, the front-end | tip of a resin sheet slides smoothly and reliably along the inner surface of the base end side of the resin sheet located in the slit side, and overlaps more correctly. The overlap of the resin tube is performed on the slit side of the mold. By having the overlap portion, the opening of the resin tube is suppressed.

According to a fourth aspect of the present invention, there is provided a mold for manufacturing an outer tube in which a hole having a substantially columnar space and a resin sheet communicating in a tangential direction from the outside to the inner peripheral surface of the hole are inserted into a metal block. A slit is provided, the block is divided into a plurality of mold parts with the axial direction and parallel direction of the hole part as a dividing surface, and a mold part arranged on one slit side of the hole part is provided. The resin sheet can be moved so as to open the hole in the insertion direction of the resin sheet or in the direction opposite to the direction, and a mold part arranged on the other side of the hole passes through the hole to the outside. It is movable, The said resin sheet is inserted in this hole part from this slit, It is rounded in the shape of a tube along the inner peripheral surface of this hole part, It is characterized by the above-mentioned.

  With the above configuration, after the resin tube is rounded in the hole of the mold, the mold part on the slit side is opened, and then the other mold part pushes the resin tube from the hole to the outside on the mold open side. For example, paying out or moving to a cooling device. The resin tube is exposed to the outside from the overlap portion side. Since a part of the sheet rounding block also functions as a tube pushing portion, the structure of the apparatus is made compact.

The outer sheath tube manufacturing method according to claim 5, and the hole having a substantially cylindrical space, possess a slit communicating tangentially with the inner peripheral surface of the hole portion from the outside, the slit, the inner peripheral gold for chromatic and first inner surface following the tangentially to the surface, facing the first inner surface, and a second inner surface which is provided the resin sheet is separated from the insertable in said first inner surface, the using a mold, while inserting the resin sheet from the slit into the hole portion, rounded into a tubular shape along the resin sheet on the inner peripheral surface of the hole portion, the resin tube and heating the resin sheet in this state It is characterized by.

  With the above configuration, for example, a single resin sheet having a size of the developed shape of the outer tube is pushed along the inner peripheral surface of the hole through the slit, and the insertion tip of the resin sheet extends along the inner peripheral surface of the hole. While being guided, the resin sheet is bent in a curved shape along the inner peripheral surface of the hole, and is rounded (wound) to one round or more to be formed into a tube shape. In this state, the resin sheet is heated to form a resin tube. In the case of being rounded more than once, a portion on the insertion tip side of the resin sheet overlaps along the inner surface of the resin sheet.

  By inserting the resin sheets into the hole one by one instead of continuously, small-scale production of the outer tube is facilitated. In addition, the metal block has a slit for inserting the resin sheet and a hole for rounding the resin sheet, so that the structure of the mold for manufacturing the outer tube can be made compact, simplified, and cost-effective. The Further, since a flat resin sheet material is handled, it is not bulky at the time of transportation, and space is saved and transportation workability is improved.

  The outer tube manufacturing method according to claim 6 is the outer tube manufacturing method according to claim 5, wherein the heating temperature is increased to a temperature of a plastic deformation region of the resin tube.

  With the above configuration, when the resin sheet is rolled in the mold and heated at the temperature of the plastic deformation region, the resin tube springback (in the diameter expansion direction) is taken out when the resin tube after heating is taken out of the mold. Elastic deformation) does not occur, and problems such as defective outer diameter of the resin tube and opening of the overlap portion are prevented. In addition, since it is not necessary to cool the resin tube and cause plastic deformation (preventing springback), a cooling device is not necessary.

The outer tube manufacturing method according to claim 7 includes a hole having a substantially columnar space, and a slit that communicates from the outside to the inner peripheral surface of the hole in a tangential direction, and the axial direction of the hole using a mold which is dividable into the mold portion of the multiple as the dividing plane parallel, while inserting a resin sheet into the hole portion from the slit, along the resin sheet to the inner peripheral surface of the hole portion In the state, the resin sheet is heated, and after the heating, a part of the mold part is moved so as to open the hole part on the slit side, and the side opposite to the open side The resin sheet rolled into a tube shape is pushed by another mold part, and is discharged to the outside or moved to a cooling device to be cooled.

  With the above configuration, for example, the resin tube is pushed by a part (other) of the mold part and is discharged from the mold to the outside as a product (exterior tube). When the resin tube needs to be cooled, the resin tube is pushed by a part (other) of the mold part, moves from the mold to an adjacent cooling device, and is cooled to a required temperature by the cooling device. In the mold, the resin sheet is overlapped on the slit side, the resin tube is moved from the overlap portion side to the cooling device, and is efficiently cooled from the overlap portion side having poor heat dissipation.

  According to the first aspect of the present invention, a compact, simple, and low-cost mold for manufacturing an outer tube, in which a slit for inserting a resin sheet and a hole for rounding a resin sheet are provided inside a metal block. Thus, the outer tube can be easily formed in a space-saving manner. Further, by inserting the resin sheets into the mold one by one instead of continuously, the required number of outer tubes can be produced when necessary, and it is possible to easily cope with small-scale production.

  According to the second aspect of the present invention, the insertion tip of the resin sheet is guided inward along the small-diameter inner peripheral surface of the hole portion on the downstream side in the sheet rounding direction, and the resin sheet protrudes into the inner surface on the proximal end side. The overlapping portion of the resin tube can be easily formed by smoothly overlapping without being hit.

  According to the invention described in claim 3, along the inner peripheral surface of the hole, which gradually becomes a smaller diameter, the insertion tip of the resin sheet is guided gradually inward, and smoothly and reliably applied to the inner surface of the base end side of the resin sheet. By overlapping, the overlap part of the resin tube can be easily and reliably formed.

  According to the fourth aspect of the present invention, a part of the sheet rounding block is also used as the tube pushing portion, so that the manufacturing process can be made more compact and space-saving.

  According to the fifth aspect of the present invention, the exterior tube can be easily formed in a space-saving manner using a simple and compact mold having a slit for inserting the resin sheet and a hole for rounding the resin sheet. it can. Also, by inserting resin sheets one by one into the mold hole instead of continuously, the required number of outer tubes can be produced when needed, and can easily accommodate small-volume production. it can.

  According to invention of Claim 6, when taking out a resin tube from a metal mold | die, the malfunction of the spring back of a resin tube, ie, an outer diameter defect, and the opening of an overlap part, can be prevented. In addition, since it is not necessary to cool and plastically deform the resin tube (to prevent springback), a cooling device is not required and the manufacturing process can be further saved.

  According to the seventh aspect of the present invention, the resin tube can be cooled by being discharged to the outside or moved to a cooling device as necessary. The resin tube can be cooled efficiently from the overlap portion side. Further, the manufacturing process can be made more compact and space-saving by using another mold part as a tube pushing part.

It is a perspective view which shows 1st embodiment of the metal mold | die for exterior tube manufacture of this invention, and an exterior tube manufacturing method. It is a front view showing a first embodiment similarly. It is a front view which shows 2nd embodiment of the metal mold | die for exterior tube manufacture of this invention, and an exterior tube manufacturing method. It is a front view which similarly shows one operation | movement of 2nd embodiment. It is a front view which similarly shows the next operation | movement of 2nd embodiment. It is the front view of the 1st process which shows 3rd embodiment of the metal mold | die for exterior tube manufacture of this invention, and an exterior tube manufacturing method. It is a front view showing the 2nd process of a third embodiment similarly. It is a front view showing the 3rd process of a third embodiment similarly. It is a front view showing the 4th process of a third embodiment similarly. It is a front view showing the 5th process of a third embodiment similarly. It is a front view which shows 4th embodiment of the metal mold | die for exterior tube manufacture of this invention, and an exterior tube manufacturing method. It is a front view which similarly shows one operation | movement of 4th embodiment. It is a front view which similarly shows the next operation | movement of 4th embodiment. It is a front view which shows one form of the conventional exterior tube manufacturing apparatus and an exterior tube manufacturing method.

  1 to 2 show a first embodiment of an outer tube manufacturing mold of the present invention and an outer tube manufacturing method using the same.

  As shown in FIG. 1, the outer tube manufacturing mold 1 includes a metal horizontally long rectangular block 2, a horizontally long hole 3 having a substantially cylindrical space, and an inner peripheral surface 4 of the hole 3. And a straight slit 5 in the vertical direction communicating in the tangential direction along the line.

  A pair of upper and lower fixing small holes 7 are provided through the left side of the block 2, and a vertical slit 5 is provided on the right side of the block 2. Bolts (not shown) are horizontally inserted into the small holes 7 and the block 2 is fixed to, for example, a frame of an exterior tube manufacturing apparatus (not shown). If the small hole 7 is used as a knock pin insertion hole, a plurality of blocks 2 can be connected in the axial direction, and it can be applied to a short outer tube or a long outer tube (this will be described later in each embodiment). The same applies to the form). The hole 3 of the block 2 is formed by, for example, drilling or honing. The hole 3 has a substantially cylindrical space (substitute with reference numeral 3) inside the inner peripheral surface 4.

  As shown in FIG. 2, the slit 5 has a right inner surface 5 a that is long in the vertical direction (outer side) and a flat inner surface 5 b that is short in the vertical direction on the left side (inner side). The inner circumferential surface 4a on the right side and lower half side of the hole 3 smoothly continues without a step in the tangential direction, and the inner surface 5b on the left side of the slit 5 has an arc shape on the right side and upper half side of the hole 3. It continues to intersect the inner peripheral surface 4d at an acute angle.

  An intersection 8 between the inner surface 5b on the left side of the slit 5 and the arc-shaped inner peripheral surface 4d on the right side and upper half side of the hole 3 protrudes downward in a beak shape. The intersecting portion 8 includes the intersecting portion (protruding tip) and the vicinity thereof. The slit 5 is formed by cutting or the like. The virtual extension surface of the arc-shaped inner peripheral surface 4d on the right side and upper half side of the hole 3 is a flat inner surface 4e on the upper right side and the right side of the hole 3, which is an extension surface of the inner surface 5a on the right side (outer side) of the slit 5. (The inner surface 4e can be regarded as a part of the inner surface 5a on the right side of the slit 5).

  The block 2 has upper, lower, left and right wall portions 2 a to 2 d (FIG. 1), and an upper opening 5 c (FIG. 2) that is an entrance of the slit 5 is formed in the upper wall 2 a over the entire length of the block 2. A hole 3 is provided through the block 2 in the front-rear direction, and the hole 3 is opened on the front and rear end surfaces 2 e of the block 2. The gap size of the slit 5 is defined to be slightly wider than the thickness of a resin sheet 9 described later.

  In the description of the embodiments, the front / rear / left / right directions are for convenience of description, the front / rear direction indicates the longitudinal direction of the block, and the left / right direction indicates the short (width) direction of the block. The vertical direction coincides with the vertical direction.

  The resin sheet 9 is inserted downward (pressed in) from the upper opening 5c of the slit 5, and the resin sheet 9 is curved clockwise (right) along the inner peripheral surface 4 of the hole 3 and rounded into a cylindrical shape. The That is, when the resin sheet 9 is pushed further downward from the state of FIGS. 1 and 2, the insertion tip 9 a of the resin sheet 9 is arranged so that the lower arc-shaped inner peripheral surface 4 b and the upper side on the left half side of the hole portion 3. And the arcuate inner peripheral surface 4c.

  Further, the insertion tip 9a of the resin sheet 9 is in sliding contact with the arcuate inner peripheral surface 4d on the upper side and the right side of the hole 3, and on the lower opening 5d (FIG. 2) side that is the exit side of the slit 5, 9 is in sliding contact with the inner surface 9 c (FIG. 2) on the base end 9 b side (the upper end side in FIG. 2) of the resin sheet 9, and the portion on the front end 9 a side of the resin sheet 9 is the base of the resin sheet 9. The resin sheet 9 is rounded (rolled) into a cylindrical shape, overlapping (overlapping) inside the portion on the end 9b side.

  The resin sheet 9 is heated in a rolled state to form a cylindrical resin tube (not shown). The resin sheet 9 can be easily heated by heating the mold 1. The heating temperature of the resin sheet 9 is preferably a temperature at which the resin sheet 9 is plastically deformed into a cylindrical shape. The rounded resin tube is taken out from the front and rear openings (indicated by reference numeral 3) of the hole 3 in the integrated mold 1 of this example. It is preferable to cool the resin tube by natural cooling or forced cooling before or after taking it out of the mold 1.

  The resin tube is commercialized as an outer tube by being taken out from the mold 1 or by being cut to a required length. The length of the mold 1 in FIG. 1 corresponds to the short outer tube, and the long outer tube is formed using a longer mold than in FIG.

  The cross-sectional shape of the hole 3 may be a perfect circle, but rather, the radius of the inner peripheral surface 4 of the hole 3 is the lower part of the slit 5 as indicated by dotted arrows E1 to E3 in FIG. It is preferable to set the cross-sectional circle shape so as to gradually decrease clockwise (right) from the opening (exit) 5d. In this case, as an example, the radius of the inner peripheral surface 4 of the hole 3 can be sequentially reduced to a curved shape along, for example, a trochoid curve or an involute curve. The circular cross section includes a true circular section and a substantially circular cross section.

  For example, in the range E1 from the lower and right arcuate inner peripheral surface 4a of the hole 3 following the lower opening 5d of the slit 5 to the lower and left arcuate inner peripheral surface 4b, a half of the hole 3 is formed. The radius R1 of the circular inner peripheral surfaces 4a and 4b is defined to be large (large diameter), and the radius R2 of the inner peripheral surface 4c is set within a range E2 of the arc-shaped inner peripheral surface 4c on the upper side and the left side of the hole 3. In the range E3 from the upper side of the hole 3 to the left end (substitute with reference numeral 8) of the lower opening 5d of the slit 5, the right side and the upper inner peripheral surface 4d of the hole 3 It is also effective to define the radius R3 to be small (small diameter).

  In the example of FIG. 2, the range E3 of the inner peripheral surface 4d on the right side and the upper side of the hole 3 extends from a position slightly shifted to the right side from the vertex 3a of the hole 3 to the left end 8 of the lower opening 5d of the slit 5. However, it may be from the apex 3a of the hole 3 to the left end 8 of the lower opening 5d of the slit 5.

  Thus, by defining the radius R of the inner peripheral surface 4 of the hole 3 gradually smaller clockwise (clockwise) from the lower opening 5 d side of the slit 5, the resin sheet 9 is inserted into the slit 5 and the hole 3 When the resin sheet 9 is rounded clockwise along the inner peripheral surface 4, the front end 9 a of the rounded resin sheet 9 is a flat portion on the base end 9 b side of the resin sheet 9 on the lower opening 5 d side of the slit 5. Without striking the inner surface 9c, the resin sheet 9 is smoothly slid in a substantially tangential direction, and the rounding operation of the resin sheet 9 and the formation of an overlap portion (not shown) are performed smoothly and reliably. The flat portion on the base end 9b side of the resin sheet 9 is rounded into an arc shape by a rounding operation.

  Alternatively, the radii R1 and R2 of the inner peripheral surfaces 4a to 4c of the hole 3 are set in a range E1 to E2 from the lower side and the right side of the hole 3 to the apex 3a of the hole 3 or the vicinity thereof clockwise (right). The radius R3 of the inner peripheral surface 4d of the hole 3 is defined by the same radius R1, R2 in the range E3 from the apex 3a of the hole 3 or the vicinity thereof to the left end 8 of the lower opening 5d of the slit 5. It is also possible to define a smaller value. The radius R3 of the inner peripheral surface 4d at the portion 8 where the inner peripheral surface 4 of the hole 3 intersects the slit 5 at an acute angle is defined to be smaller than the radii R1 and R2 of the inner peripheral surfaces 4a to 4c other than the intersecting portion 8. Is done.

  Also in this case, when the resin sheet 9 is inserted into the slit 5 and rounded clockwise along the inner peripheral surface 4 of the hole 3, the tip 9 a of the resin sheet 9 extends from the lower opening 5 d of the slit 5. It moves clockwise to the top 3a of the hole 3, and then is guided obliquely downward (substantially downward) from the top 3a of the hole 3 along the small-diameter inner peripheral surface 4d on the upper side and the right side of the hole 4, Without sliding against the inner surface 9c of the flat portion on the base end 9b side of the resin sheet 9 on the lower opening 5d side of the slit 5, the resin sheet 9 is smoothly slid in the tangential direction, and the rounding operation of the resin sheet 9 and the overlap portion Formation is smooth.

  In this case, the tip 9a of the resin sheet 9 moves clockwise from the lower opening 5d of the slit 5 to the top 3a of the hole 3 depending on the hardness, thickness, rounded diameter, and the like of the resin sheet 9. After that, when shifting from the top 3a of the hole 3 to the small-diameter inner peripheral surface 4d on the right side of the hole 3, the hole 3 is prevented from being caught by the small-diameter inner peripheral surface 4d and slidingly. It is preferable that the radius R3 of the inner peripheral surface 4d is not suddenly reduced.

  In the embodiment of FIG. 1, a large number of projections and depressions 10 are formed on the resin sheet 9 in advance. The unevenness 10 is for enhancing the flexibility of the resin tube in the radial direction when the resin sheet 9 is rolled into a resin tube. The shape of the unevenness 10 is preferably, for example, a rhombus or a hexagon. For example, the unevenness 10 is arranged so that one diagonal line of the rhombus or hexagonal unevenness 10 coincides with the rounding direction of the resin sheet 9 (insertion direction into the slit 5) and the other diagonal line coincides with the axial direction of the hole 3. Is done.

  When the exterior tube is used at a location where bending is not required (location where the exterior tube is linearly disposed), the formation of the unevenness 10 on the resin sheet 9 is not necessary. About the formation method of the unevenness | corrugation 10, since this applicant previously proposed in Japanese Patent Application No. 2013-219936, description is abbreviate | omitted. Also in other embodiments described later, the resin sheet 9 having the irregularities 10 is applied.

  The resin sheet 9 is cut in advance, for example, to a substantially circumferential length of one resin tube (a length from the distal end 9a to the proximal end 9b in FIG. 2). In the case where there is no overlap between both end edges of the resin tube, this length is equal to the circumferential length of the resin tube. The axial length of the resin tube is equal to the total length of the mold 1 in the front-rear direction (when the resin tube is not cut) or less (when the resin tube is cut).

  When the overlap portion is not formed on the resin tube, in FIG. 1 and FIG. 2, the tip 9 a of the resin sheet 9 inserted into the hole 3 from the slit 5 of the mold 1 is aligned along the inner peripheral surface 4 of the hole 3. The resin sheet 9 is brought into contact with the base end 9b of the slit 5 on the side of the lower opening 5d of the slit 5, and the resin sheet 9 is heated and shaped into a cylindrical shape.

  The overlap of the edge of the outer tube is for preventing the opening of the edge when the outer tube is bent in the radial direction, so that a wire (not shown) such as an electric wire inserted and accommodated in the outer tube can be obtained. Projection and exposure of the body are prevented. As the linear body, fluid pipes such as rubber, optical fibers, and the like can be used in addition to the electric wires. In the case where the outer tube is disposed at a portion where it does not bend, it is possible not to form the overlap portion.

  1 and 2, the integrated mold 1, a heating device (not shown) for heating the mold 1, and a resin sheet 9 are pushed into the slit 5 of the mold 1 (not shown). A compact and low-cost exterior tube manufacturing apparatus with a small number of structures such as a sheet pushing device (an operator can push the resin sheet 9 using a jig or the like without using a pushing device) Can do. Moreover, since it is not necessary to supply the resin sheet 9 continuously like the seamless corrugated tube 63 of the prior art example (patent document 2) of FIG. 14 or the plastic sheet of patent document 1, for example, the required number of exterior tubes is required. It is easy to produce only a small amount.

  3 to 5 show a second embodiment of the outer tube manufacturing mold of the present invention and the outer tube manufacturing method using the same.

  The outer tube manufacturing mold 11 of FIGS. 3 to 5 is different from the one in which the outer tube manufacturing mold 1 of the embodiment of FIGS. doing. The shape of the slit 15 is the same as that of the slit 5 of the embodiment of FIGS. 1 to 2, and the shape of the hole 13 is the same in that the radius R is different within the range of arrows E <b> 1 to E <b> 3 of FIG.

  The metal block 12 of the outer tube manufacturing mold 11 includes an upper mold part 16, a lower and right mold part 17, a lower and left mold part 18, and a lower and left mold part. The middle mold part 19 is disposed between the mold part 18 and the left part of the upper mold part 16. The upper mold part 16 is connected to each other at the front and rear end sides of the slit 15 with a connection wall (not shown). It is also possible to divide the left and right parts of the upper mold part 16 as in the embodiment of FIG.

  As shown in FIG. 3, the upper mold portion 16 includes an arc-shaped inner peripheral surface 16a that forms a part of the inner peripheral surface 14 of the hole 13 having a substantially cylindrical space, and an arc-shaped inner peripheral surface 16a. It has a vertical and straight slit 15 formed in the vertical direction on the right side, and an insertion hole (not shown) for a horizontally long fixing bolt 20 provided on the left side of the arc-shaped inner peripheral surface 16a. The inner surface 15a on the right (outer) side of the slit 15 continues without a step from the flat inner surface 17b raised in the tangential direction from the arc-shaped inner peripheral surface 17a of the lower and right mold part 17. The slit 15 communicates with the arcuate inner peripheral surface 17a of the lower and right mold part 17 in the tangential direction.

  The arcuate inner peripheral surface 17a of the lower and right mold part 17 smoothly follows the arcuate inner peripheral surface 18a of the lower and left mold part 18 without a step. The lower and left mold part 18 has an insertion hole (not shown) for the horizontally long fixing bolt 20 on the lower left side. The arcuate inner peripheral surface 18a of the lower and left mold part 18 continues to the arcuate inner peripheral surface 19a of the intermediate mold part 19 without a step, and the arcuate inner periphery of the intermediate mold part 19 The surface 19a continues to the arcuate inner peripheral surface 16a of the upper mold part 16 without a step. The inner peripheral surface 14 of the hole 13 is formed by the arc-shaped inner peripheral surfaces 16a to 19a of the mold parts 16 to 19, and the hole 13 is formed in a substantially cylindrical space (reference numeral 13) inside the inner peripheral surface 14. (Substitute).

  The horizontal lower end surface (divided surface) 16b of the right side portion of the upper mold part 16 is also positioned at the same height as the horizontal lower end surface (divided surface) 16c of the left side portion. The right end of the arc-shaped inner peripheral surface 16 a of the upper mold part 16, that is, the lower opening 15 d of the slit 15 is located at the same height as the left and right lower end surfaces 16 b and 16 c of the upper mold part 16. A horizontal upper end surface (divided surface) 17d (FIG. 4) of the lower and right mold portion 17 is joined (contacted) to the lower end surface 16b on the right side of the upper mold portion 16, and is connected to the lower end surface 16c on the left side. A horizontal upper end surface (divided surface) 19b (FIG. 4) of the middle mold part 19 is joined (contacted).

  The inner surface 15a (FIG. 4) on the right (outer) side of the slit 15 and the inner surface 15b on the left (inner) side are formed in parallel with the same length in the vertical direction. The inner surface 15b on the left (inner) side of the slit 15 continues acutely to the arc-shaped inner peripheral surface 16a of the upper mold part 16, and the left (inner) inner surface 15b and the arc-shaped inner peripheral surface 16a The intersection portion 21 protrudes downward. The intersection part 21 includes an intersection part (protruding tip) and its vicinity.

  The vertical left end surface 17c (FIG. 4) of the right and lower mold part 17 is joined (contacted) to the vertical right end surface 18c of the left and lower mold part 18, and the joining position is shown in FIG. In the example of FIG. 3, the hole 13 (FIG. 3) formed by the arc-shaped inner peripheral surfaces 16a to 19a of the mold parts 16 to 19 is slightly to the right of the center line m1 in the vertical direction ( It is also possible to match the joining position with the vertical center line m1 of the hole 13). The horizontal upper end surface (divided surface) 18b of the left and lower mold part 18 is joined (contacted) to the horizontal lower end face 19c (FIG. 5) of the intermediate mold part 19.

  In FIG. 3, the radius R1 of the arc-shaped inner peripheral surface 17a of the right and lower mold part 17 and the arc-shaped inner peripheral surface of the left and lower mold part 18 are within the range of the dotted arrow E1. The radius R1 of 18a and the radius R1 of the lower half of the arcuate inner peripheral surface 19a of the middle mold part 19 are defined to be the same and large (as an example, 7.5 mm), and the dotted arrow E2 In range, the radius R2 of the upper half of the arc-shaped inner peripheral surface 19a of the middle mold part 19 and the radius R2 of the left half of the arc-shaped inner peripheral surface 16a of the upper mold part 16 are: The radius R3 of the right half of the arcuate inner peripheral surface 16a of the upper mold part 16 is small (as an example) within the range of the dotted arrow E3, which is defined to be the same and medium (as an example 7.0 mm). 6.5mm).

  In FIG. 3, the radius of the arcuate inner circumferential surfaces 17a to 19a on the lower half side is gradually reduced clockwise (right) from the slit 15 side within the range of the arrow E1 (for example, the arcuate shape on the lower side and the right side). The radius of the right end of the inner peripheral surface 17a is 7.5 mm, and the radius of the lower half side of the arc-shaped inner peripheral surface 19a of the middle mold part 19 is 7.1 mm). The radius of the arc-shaped inner peripheral surfaces 19a, 16a on the side and the left half side is gradually reduced further clockwise (rightward) (for example, the upper half of the arc-shaped inner peripheral surface 19a of the intermediate mold 19). The radius on the side is 7.0 mm, and the radius on the center side of the upper arc-shaped inner peripheral surface 16a is 6.6 mm).

  Further, within the range of the arrow E3, the radius of the arcuate inner peripheral surface 16a1 on the upper side and the right side is gradually reduced clockwise (for example, the radius of the left end of the arcuate inner peripheral surface 16a1 is 6.5 mm). And the radius of the right end (intersection 21) of the arc-shaped inner peripheral surface 16a1 can be made smaller.

  As described above, the radius R of the inner peripheral surface 14 of the hole 13 is gradually reduced along the rounding direction of the resin sheet 9, so that when the resin sheet 9 is rounded as shown in FIG. 9 can be smoothly slidably contacted with the inner surface 9c on the base end 9b side of the resin sheet 9 so that the overlap portion 9d can be formed smoothly and reliably.

  In FIG. 3, for example, the radii of the arc-shaped inner peripheral surfaces 17a, 18a of the left and right mold parts 17, 18 and the radius of the arc-shaped inner peripheral surface 19a of the middle mold part 19, The radius of the left half of the arcuate inner peripheral surface 16a of the upper mold part 16 is defined to be the same, and only the radius R3 of the right half 16a1 of the arcuate inner peripheral surface 16a of the upper mold part 16 is specified. It is also possible to arrange the right half side 16a1 (intersection 21 with the slit 15) of the arc-shaped inner peripheral surface 16a obliquely downward along the downward extension direction of the slit 15. In this case, the radius R3 of the right half side 16a1 of the arc-shaped inner peripheral surface 16a can be gradually decreased clockwise (clockwise) toward the slit 15.

  Even in this case, when the resin sheet 9 is inserted into the slit 15 and rounded clockwise along the inner peripheral surface 14 of the hole 13, the tip 9 a of the resin sheet 9 extends from the lower opening 15 d of the slit 15. It moves clockwise to the top 13a of the hole 13, and then is guided obliquely downward (substantially downward) from the top 13a of the hole 13 along the small diameter inner peripheral surface 16a1 on the upper side and right of the hole 13, Without sliding against the inner surface 9c of the flat portion on the base end 9b side of the resin sheet 9 on the lower opening 15d side of the slit 15, the resin sheet 9 is smoothly slid in the tangential direction, and the rounding operation of the resin sheet 9 and the overlap portion 9d are performed. Is formed smoothly.

  As shown by a chain line 22 on the outer peripheral side of the mold 11 in FIG. 3, a heating device such as an electric heater (not shown) is arranged so that the entire mold 11 is heated. The heating device is preferably mounted, for example, in each of the mold parts 16 to 18, but can be disposed on the upper side or the left side of the mold 11.

  The resin sheet 9 inserted (pressed) into the hole 13 from the slit 15 of the mold 11 is rounded into a cylindrical shape along the inner peripheral surface 14 of the hole 13, and in FIG. In the state of 4), it is preferable to be heated to the plastic deformation region by a heating device. If the heating (temperature, time) of the resin tube 9A is insufficient, the resin tube 9A is heated in the elastic deformation region, and the resin tube 9A is spring-backed when taken out in FIGS. This is because there is a possibility that the opening of the mouth and deformation in the diameter expansion direction may occur.

  Depending on the material of the resin sheet 9 (for example, in the case of a hard resin sheet), the mold 11 may be preheated before the resin sheet 9 is inserted into the slit 5. In the case of the resin sheet 9 made of a flexible material, if the mold 11 is heated before being rounded, it may be softened simultaneously with the insertion into the slit 15 and the rounding process may not be performed smoothly. It is preferable to heat.

  As shown in FIG. 4, when the resin tube 9A is taken out, the lower and right mold parts 17 facing the lower side of the slit 15 are lowered by an elevating means (not shown), and the upper mold is located on the right side of the resin tube 9A. A large (wide) opening 23 is formed between the part 16 and the lower and right mold part 17. An example of the lifting means is a vertical cylinder. The overlap portion 9d side of the resin tube 9A is located on the opening 23 side. The base end 9b of the resin tube 9A is generally located on the horizontal center line m2 (FIG. 3) of the resin tube 9A.

  Next, as shown in FIG. 5, an intermediate mold part (a part of the mold) 19 located on the left side of the resin tube 9 </ b> A is moved horizontally to the right by the horizontal moving means and passes through the hole 3 and the slit 15. Then, the arc-shaped inner peripheral surface 19 a of the intermediate mold part 19 pushes the resin tube 9 a into the cooling device 24 adjacent to the right side of the mold 11 and delivers it. The resin tube 9A is inserted into the cooling device 24 from the overlap portion 9d side.

  The middle mold part 19 passes outside through the opening 23 between the upper mold part 16 and the lower and right mold part 17 (more than the right end surfaces of the upper and lower mold parts 16, 17). Protrudes to the right). An example of the horizontal moving means is a horizontal cylinder. The resin tube 9A is cooled in a state where the resin tube 9A is held between the intermediate mold part 19 and the cooling device 24.

  The cooling device 24 is, for example, a metal horizontal and horizontally long (in the axial direction of the resin tube 9A) that has an arcuate tube receiving surface 25a facing the right side of the arcuate inner peripheral surface 19a of the intermediate mold part 19. The cooling block 25 is extended.

  The cooling block 25 is preferably provided with, for example, a cooling air blow-out opening that is opened on the tube receiving surface 25 a side, or the cooling water is circulated inside the cooling block 25. It is also possible to naturally cool the resin tube 9A in the cooling block 25. A tube guide plate 25b is provided so as to protrude leftward before and after the cooling block 25 and above and below it. At least the mold 11, the heating device in FIG. 3 (represented by reference numeral 22), and the cooling device 24 in FIG. 5 constitute an outer tube manufacturing apparatus.

  The overlap portion 9d can be efficiently cooled by overlapping (pressing) the overlap portion 9d with poor heat dissipation on the cooling block 25 directly in the radial direction of the resin tube 9A. The resin tube 9A is efficiently cooled in the circumferential direction, for example, starting from the overlap portion 9d.

  The overlap margin of the overlap portion 9d of the resin tube 9A in FIG. 5 is merely an example, and for example, it is possible to provide an overlap margin of the overlap portion 9d to the vicinity of a half circumference of the resin tube 9A. For example, the overlap portion 9d can be opened outward with an unillustrated assembling jig or the like, and in that state, an outer tube (resin tube 9A) is covered with a plurality of unillustrated electric wires to form a wire harness. Form.

  The resin tube 9A in FIG. 5 has the same irregularities 10 as in the embodiment of FIG. 1, and the completed exterior tube has good radial flexibility. In the specification, the completed product is called an exterior tube, and the product leading to the product is called a resin tube.

  After the cooling of the resin tube 9A is completed, the cooling device 24 moves to the right in FIG. 5, and the intermediate mold portion 19 moves back to the left, so that the resin tube 9A is moved from the cooling device 24 to the intermediate gold. The support by the mold 19 is released, and it is paid out downward. The intermediate mold 19 is returned to the original position in FIG. 4 by the horizontal moving means, and then the lower and right mold part 17 is lifted by the lifting means to return to the original position in FIG.

  6 to 10 show a third embodiment of the outer tube manufacturing mold of the present invention and the outer tube manufacturing method using the same.

  3 to 5, the four-part mold 21 is used, but in the present embodiment, the five-part mold 31 is used. 3 to 5, the cooling device 24 is used. However, in this embodiment, the cooling device is omitted.

  As shown in FIG. 6, this outer tube manufacturing mold 31 is composed of an upper mold part 38 and a mold part 36 on the upper right side and a mold part 37 on the left side. Yes. The upper and right mold part 36 has an arcuate inner peripheral surface 36a on the right half side, and the upper and left mold part 37 is a left side that continues to the arcuate inner peripheral surface 36a on the right half side without any step. It has a semicircular arc-shaped inner peripheral surface 37a.

  The upper and right mold portions 36 are formed on the upper and left sides except for the arc-shaped inner peripheral surface 36a on the right half side and the downward projecting wall 36b having the arc-shaped inner peripheral surface 36a on the right half side. Overlaid on the upper side of the mold part 37. In the projecting wall 36b, the arc-shaped inner peripheral surface 36a and the left (inner) surface of the slit 35 intersect at an acute angle, and the intersecting portion 39 projects downward. The intersecting portion 39 includes the intersecting portion (protruding tip) and the vicinity thereof. A vertical right end surface 36 c (FIG. 8) of the upper and right mold part 36 constitutes the left (inner) surface of the slit 35.

  With respect to the upper and left mold parts 37 that are the fixed side, the upper and right mold parts 36 can be lifted by lifting means (not shown) such as a vertical cylinder. The vertical left end surface 36b (FIG. 9) of the upper and right mold part 36 rises along the vertical left end surface (divided surface) 37b1 of the step part 37b (FIG. 9) of the upper and left mold part 37. Guided when returning (descent).

  As shown in FIG. 9, when the upper and right mold part 36 is raised, when the resin tube 9A is taken out, the lower end of the arc-shaped inner peripheral surface 36a on the right half side of the upper and right mold part 36 is resin. Interference with the tube 9A is prevented.

  As shown in FIG. 6, the upper and right mold part 36, the upper and left mold part 37, the lower and right mold part 40, the lower and left mold part 41, and the middle and left side. The metal block 32 is composed of the mold part 42. The metal block 32, the hole 33 having a substantially cylindrical space, and the slit 35 constitute a mold 31. The hole 33 has a substantially cylindrical space (represented by reference numeral 33) inside the inner peripheral surface 34. The inner peripheral surface 34 of the hole 33 is constituted by the arc-shaped inner peripheral surfaces 36a, 37a, 40a, 42a of the mold portions 36, 37, 40, 42 excluding the lower and left mold portion 41. Yes. Electric heaters as heating devices 46 are mounted on the upper and right mold parts 36 and the lower left and right mold parts 40 and 41, respectively. Each heating device 46 has a cylindrical shape, is inserted and fixed in a horizontal hole (not shown) in the front-rear direction of each mold part 36, 40, 41, and is arranged near the periphery of the hole part 33 of the mold 31. ing.

  In the embodiment of FIG. 5, there is a concern that the upper part of the resin tube 9A interferes with the arc surface 16a1 on the right half side of the upper mold part 16 when the resin tube 9A is taken out. As shown in FIG. 9, the upper and right mold portions 36 are raised to form a wide opening 43, thereby eliminating interference.

  As shown in FIG. 6, the upper left portion of the left mold portion 37 and the upper left portion of the lower left mold portion 41 are provided as positioning stoppers for the vertical left end surface 42b of the middle mold portion 42. A protrusion 44 is provided. As shown in FIG. 10, the middle mold part 42 is formed on the lower surface (partition surface) 37c of the upper and left mold part 37 on the fixed side and the upper surface (partition surface) 41c of the lower and left mold part 41. Along the horizontal direction, it can be moved horizontally in the right direction by a horizontal moving means (not shown) such as a horizontal cylinder. Description of the divided surfaces of the mold parts 36, 40, 42 is omitted.

  As shown in FIG. 6, the arc-shaped inner peripheral surface 42 a of the middle mold part 42 includes the arc-shaped inner peripheral surface 37 a of the upper and left mold part 37 and the circle of the lower and right mold part 40. It continues without any step to the arc-shaped inner peripheral surface 40a. The lower and left mold parts 41 do not have an arcuate inner peripheral surface. The arc-shaped inner peripheral surface 42a of the middle mold part 42, the arc-shaped inner peripheral surface 40a of the lower and right mold part 40, and the arc-shaped inner peripheral surfaces of the upper mold parts 36 and 37 36a and 37a are connected by substantially the same arc length (substantially 1/3 arc), and constitute the inner peripheral surface 34 of the hole 33 having a substantially circular cross section.

  A vertical right end surface 36c (FIG. 8) of the upper and right mold part 36, and an upward vertical inner surface 40c (FIG. 8) following the arcuate inner peripheral surface 40a of the lower and right mold part 40. In between, a vertical and straight slit 35 for inserting a resin sheet is formed. The resin sheet 9 (FIG. 6) is inserted (pressed) into the slit 35 by the sheet supply device 45.

  The sheet supply device 45 includes a right guide wall 45a located above the vertical rising wall 40b of the lower and right mold part 40 with a slight gap, and an upper and right mold part 36. A left guide wall 45b positioned with a gap on the upper surface, a vertical slit-like gap 45c formed between the left and right guide walls 45a and 45b, and the left and right guide walls 45a and 45b. The resin sheet 9 is pushed down along the upper wall 45d that is connected and horizontally extended to the left and the slit-like gap 45c, and is supplied (pushed) into the slit 35 and the hole 33 of the mold 31 (not shown). And a pushing device.

  As this pushing device, for example, a metal blade that descends along the slit-like gap 45c and presses the upper end (base end) 9b of the resin sheet 9 downward, and the blade is lowered and raised (returned). For example, a drive unit such as a vertical cylinder is provided. The blade enters the slit 35 of the mold 31 and pushes the resin sheet 9 into the hole 33.

  The radius of the inner circumferential surface 34 having a circular cross section of the hole 33 constituted by the mold parts 36, 37, 40, 42 in FIG. 6 is the arcuate inner circumferential surface of the lower and right mold part 40. From 40a to the arcuate inner peripheral surface 36a of the upper and right mold part 36 in the clockwise (right) direction, the size is successively reduced.

  For example, as in the embodiment of FIG. 3, the arc-shaped inner peripheral surface 40a of the lower and right mold part 40 and the lower half of the arc-shaped inner peripheral surface 42a of the intermediate mold part 42 are provided. The upper half of the arcuate inner peripheral surface 42a of the middle mold part 42 and the arcuate inner peripheral surface 37a of the upper and left mold part 37 are defined by the same large radius (large diameter). The same medium radius (medium diameter) is defined, and the arcuate inner peripheral surface 36a of the upper and right mold part 36 is defined to have a small radius (small diameter). The arc-shaped inner peripheral surfaces 40a, 42a, 37a, and 36a having different diameters smoothly follow a circular cross section without a step.

  Alternatively, the radius of the arc-shaped inner peripheral surface is sequentially defined to be small for each mold part. That is, the arcuate inner peripheral surface 40a of the lower and right mold part 40 is defined as a large diameter, the arcuate inner peripheral surface 42a of the intermediate mold part 42 is defined as a medium diameter, and the upper and left side The arc-shaped inner peripheral surface 37a of the mold part 37 is defined as a medium-small diameter smaller than the medium diameter, and the arc-shaped inner peripheral surface 36a of the upper and right mold part 36 is defined as the minimum diameter.

  Alternatively, the arcuate inner peripheral surface 40a of the lower and right mold part 40, the arcuate inner peripheral surface 42a of the intermediate mold part 42, and the arcuate inner surface of the upper and left mold part 37 are used. The peripheral surface 37a is defined to have the same radius, and only the arc-shaped inner peripheral surface 36a of the upper and right mold part 36 is defined to have a smaller diameter than the radius of the other arc-shaped inner peripheral surfaces 40a, 42a, 37a. It is also possible to do.

  Below, the exterior tube manufacturing method of 3rd embodiment is demonstrated in order of the process of FIGS. 6-10.

  In the sheet setting step of FIG. 6, in a state where the mold parts 36, 37, 40, 41, and 42 are combined to form the mold 31, the sheet supply device 45 slits the mold 31 from above as indicated by the arrow A. The resin sheet 9 is inserted into the inside 35.

  Next, in the sheet rounding step of FIG. 7, the resin sheet 9 is pushed into the hole 33 of the mold 31 by the sheet feeding device 45, and the resin sheet 9 is pushed into the inner peripheral surface of the hole 33 as shown by the arrow B (rounding direction). 34 is bent along a curved line. Then, as shown in FIG. 8, the resin sheet 9 is overlapped while the front end portion 9 a ′ of the resin sheet 9 is overlapped along the inner surface 9 c on the base end portion 9 b ′ side of the resin sheet 9 (the overlap portion is indicated by reference numeral 9 d). Is rounded in the direction of arrow B to form a resin tube 9A.

  An overlap portion 9d of the resin tube 9A is disposed below the slit 35 of the mold 31. In this example, the base end 9b of the resin tube 9A is positioned slightly above the horizontal center line of the resin tube 9A (see reference numeral m2 in FIG. 3).

  Next, in the heating process after the sheet rounding in FIG. 8, the resin tube 9 </ b> A in the hole 33 of the mold 31 is heated by heating the mold 31 with the heating device 46. The heating temperature is a temperature at which the resin tube 9A is heated to the plastic deformation region. The characters “heating” in the square of the chain line on the upper side of the mold 31 in FIG. 8 are the heating device (electric heater) 46 in the mold parts 36, 40, 41 and the resin tube in the mold 31 and the mold. 9A shows a step of heating 9A. In the example of FIG. 8, the heating device 46 is disposed inside each required mold part 36, 40, 42. However, instead of this heating device 46 or in combination with the heating device 46, for example, “heating” It is also possible to dispose a rectangular block-shaped heating device indicated by the letter “” on the outside (upper side) of the mold 31. The mold 31, the heating device 46, and the sheet supply device 45 constitute an outer tube manufacturing device 48.

  By heating the resin tube 9A in the mold 31 to the plastic deformation region, when the resin tube 9A is released from the mold 31 to the outside in the next step (the mold opening step in FIG. 9), the resin tube 9A The problem of elastically expanding the diameter and the opening of the overlap portion 9d is eliminated, and the outer diameter of the resin tube 9A is accurately maintained in the same manner as the inner diameter of the hole 33 of the mold 31.

  The heating temperature of the mold 31 is different depending on the material and thickness of the resin sheet 9. As an example, the heating temperature is about 150 ° C. In the case of the resin sheet 9 having this material and thickness, it is an elastic deformation region at about 130 ° C., and there is a concern that the resin tube 9A springs back when the mold 31 in FIG. 9 is opened. The heating time of the resin tube 9A is appropriately set in relation to the heating temperature. As an example, the heating time is about 30 seconds. These heating temperatures and heating times are merely examples (reference).

  Next, in the mold opening process of FIG. 9, the upper and right mold parts 36 are raised as indicated by an arrow C, and the lower and right mold parts 40 are lowered as indicated by an arrow D. The mold parts 36 and 40 are moved up and down by a moving means (not shown) such as a vertical cylinder. By the vertical movement of the upper and lower mold parts 36 and 40 forming the slit 35, the right half side (overlap part 9d side) of the resin tube 9A is released to the outside.

  The left half side of the resin tube 9A is held by the arc-shaped inner peripheral surface 42a of the middle mold part 42 and the arc-shaped inner peripheral surface 37a of the upper and left mold part 37. The overlap portion 9d that overlaps in the radial direction of the resin tube 9A and is difficult to dissipate heat is exposed to the outside of the mold 31 so that natural cooling is efficiently performed.

  Finally, in the tube dispensing process of FIG. 10, the middle mold part (part of the mold) 42 is moved horizontally to the right as shown by the arrow E by a moving means (not shown) such as a horizontal cylinder, etc. The tube 9A is pushed further to the right by the arc-shaped inner peripheral surface 42a of the middle mold part 42 (to the lower side and to the right of the right mold part 40), and is discharged to the outside.

  The resin tube 9A can be detached from the intermediate mold portion 42 by, for example, dropping due to the weight of the resin tube 9A, air blowing, or a worker's detaching operation. Further, in FIG. 10, it is possible to naturally cool the resin tube 9A efficiently in a state where the overlap portion 9d side is released to the outside.

  After finishing the dispensing of the resin tube 9A in FIG. 10, the intermediate mold part 42 is moved to the left by a horizontal moving means (not shown) and returned to the position in FIG. The middle mold part 42 moves smoothly along the upper and lower mold parts 37, 40, 41 and is positioned at the initial position by contacting the stopper projection 44 of the upper and lower mold parts 37, 41. Further, the upper and lower mold parts 36 and 40 are moved up and down by the lifting means and returned to the position shown in FIG. 8, thereby obtaining the initial state of the mold 31 shown in FIG.

  In the outer tube manufacturing method shown in FIGS. 6 to 10, the resin tube 9 </ b> A is heated to the plastic deformation region in the tube heating step shown in FIG. 8. Therefore, for example, the cooling step for cooling the resin tube 9 </ b> A after the mold shown in FIG. There is no need to provide a (cooling device). In other words, it is not necessary to plastically deform the heated resin tube 9A by cooling (suppress elastic deformation). Thereby, a cooling process can be skipped and the cost and installation space for a cooling device can be reduced.

  However, in a state where the resin tube 9A is heated, for example, in the tube dispensing process of FIG. 10, the operator cannot hold the resin tube 9A with bare hands (gloves can be used). As will be described below, a tube cooling step (FIG. 12) is provided between the mold opening step (FIG. 11) and the tube dispensing step (FIG. 13).

  FIGS. 11-13 shows 4th embodiment of the metal mold | die for exterior tube manufacture of this invention, and an exterior tube manufacturing method.

  The steps before the mold opening step in FIG. 11 are the same as the sheet setting step in FIG. 6, the sheet rounding step in FIG. 7, and the heating step after the sheet rounding in FIG. The difference is that the cooling device 24 is arranged at the right side of the mold 31 in the process (the separation distance is the same as in FIG. 13).

  The configurations of the mold 31, the heating device 46, the sheet supply device 45, and the resin tube 9A in FIGS. 11 to 13 are the same as those in the embodiment in FIGS. 6 to 10, and the configuration of the cooling device 24 is the same as that in FIG. Since it is the same as that in the embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. The mold 31, the heating device 46, the sheet supply device 45, and the cooling device 24 constitute an outer tube manufacturing device 49.

  In the mold opening process of FIG. 11, the upper and right mold parts 36 and the lower and right mold parts 40 of the mold 31 are opened up and down by moving means (not shown) to overlap the resin tube 9 </ b> A. Simultaneously or substantially simultaneously with exposing the right half including the portion 9d, the cooling device 24 disposed on the right side of the mold 31 is directed to the mold as indicated by an arrow F by a horizontal moving means (not shown) such as a horizontal cylinder. Move in the direction of approach (left).

  As in the embodiment of FIG. 5, the cooling device 24 of the present example includes a metal cooling block 25 having an arcuate tube receiving surface 25 a facing the arcuate inner peripheral surface 42 a of the intermediate mold part 42. And upper and lower tube guide plates 25b provided at the front and rear ends (longitudinal ends) of the cooling block 25, for example. The cooling block 25 is preferably provided with an air outlet for tube cooling or piping for block water cooling.

  In the tube cooling process of FIG. 12, the intermediate mold part (a part of the mold) 42 is adjacent to the intermediate mold part 42 (part of the mold) as shown by the arrow G in a state where the resin tube 9A is held by the intermediate mold part 42. It is moved to the right toward the cooling device 24 and delivered to the cooling device 24. That is, the resin tube 9 </ b> A is held between the arc-shaped inner peripheral surface 42 a of the intermediate mold part 42 and the arc-shaped receiving surface 25 a of the cooling block 25 of the cooling device 24.

  The overlap portion 9d of the resin tube 9A is supported by the receiving surface 25a of the cooling block 25. In this state, the high temperature resin tube 9A is cooled by the low temperature cooling block 25 itself or an air blowing device provided in the cooling block 25 or the like. It is not always necessary to cool the resin tube 9A until it reaches room temperature.

  Next, in the payout process of FIG. 13, the intermediate mold portion 42 is moved and returned to the left by the horizontal moving means, and the cooling device 24 is moved (returned) to the right as indicated by the arrow H by the horizontal moving means. By releasing the resin tube 9A, the resin tube 9A is dropped (dispensed) by its own weight, for example, on a component tray (not shown) below. After the resin tube 9A is dispensed, the upper and lower mold parts 36, 40 are moved up and down by lifting means (not shown) to return to the initial positions similar to those in FIG.

  In addition, in each said embodiment, although demonstrated by the example which inserts the resin sheet 9 downward from upper direction in metal mold | die 1,11,31, for example, in embodiment of FIGS. It is also possible to fix the resin sheet 9 horizontally and insert it into the slit 5 of the mold 1 by rotating it 90 ° clockwise or counterclockwise.

  3 to 5, for example, the mold 11 is fixed at a position rotated 90 ° clockwise, the resin sheet 9 is horizontally inserted into the slit 15 of the mold 11, and the resin tube After the formation of 9A, the lower and left mold part 17 located in the extending direction of the slit 15 in FIG. 4 is moved leftward to open, and the intermediate mold part 19 is moved downward in FIG. It is also possible to push the resin tube 9A into the cooling device 24 arranged on the lower side of the mold 11.

  In each of the above embodiments, the resin tube 9A is heated by heating the molds 1, 11, and 31 with a heating device. For example, the cross section of the resin tube 9A rounded in the mold is substantially circular. It is also possible to directly heat the resin tube 9A by inserting a rod-shaped heating device (electric heater) (not shown) into the space 9e (FIG. 5) without touching the inner surface of the resin tube 9A.

  Moreover, in each said embodiment, although the metal mold | die 1,11,31 corresponding to the resin tube 9A (exterior tube) of one kind of diameter for each embodiment was shown, for example, an outer tube with a different diameter is manufactured. In this case, by facilitating a plurality of types of molds having different diameters of the holes 3, 13, and 33, it is possible to easily cope with various types of production or small amounts of various types of exterior tubes.

  In addition, the outer tube manufacturing molds 1, 11, and 31 and the outer tube manufacturing method of the present invention can be appropriately modified according to conventionally known knowledge. Of course, such modifications are included in the scope of the present invention as long as they have the configuration of the outer tube manufacturing mold and the outer tube manufacturing method of the present invention.

  The mold for manufacturing an outer tube and the method for manufacturing an outer tube according to the present invention can be used to form the outer tube easily in a space-saving manner at low cost, and to be adaptable to small-volume production.

1,11,31 External tube manufacturing mold 2,12,32 Block 3,13,33 Hole 4,14,34 Inner peripheral surface 4d, 16a1, 36a Inner peripheral surface 5,15,35 Slit 8 at the intersection , 21, 39 Crossing part 9 Resin sheet 9A Resin tube 16-19, 36, 37, 40-42 Mold part 17, 36, 40 One mold part 19, 42 of the hole part 19, 42 Middle (the other of the hole part) Mold part 24 Cooling device 46 Heating device B Rounding direction R1 to R3 Radius R3 Radius of inner peripheral surface of intersection

Claims (7)

The metal block is provided with a hole having a substantially cylindrical space, and a slit that communicates with the inner peripheral surface of the hole from the outside in a tangential direction,
The slit is provided on the inner peripheral surface, the first inner surface continuing in the tangential direction, the second inner surface facing the first inner surface, and spaced apart from the first inner surface so that a resin sheet can be inserted therethrough. An inner surface,
A mold for manufacturing an outer tube, wherein the resin sheet is inserted into the hole from the slit and rounded into a tube along the inner peripheral surface of the hole. The metal block is provided with a hole portion having a substantially cylindrical space, and a slit for inserting a resin sheet communicating with the inner peripheral surface of the hole portion from the outside in a tangential direction,
In the inner peripheral surface of the hole, the radius of the inner peripheral surface on the crossing portion side with the slit on the downstream side in the rounding direction of the resin sheet is defined to be smaller than the radius of the inner peripheral surface of the other portion,
A mold for manufacturing an outer tube, wherein the resin sheet is inserted into the hole from the slit and rounded into a tube along the inner peripheral surface of the hole. The metal block is provided with a hole portion having a substantially cylindrical space, and a slit for inserting a resin sheet communicating with the inner peripheral surface of the hole portion from the outside in a tangential direction,
The radius of the inner peripheral surface of the hole is defined so as to gradually decrease from the slit in the rounding direction of the resin sheet,
A mold for manufacturing an outer tube, wherein the resin sheet is inserted into the hole from the slit and rounded into a tube along the inner peripheral surface of the hole. The metal block is provided with a hole portion having a substantially cylindrical space, and a slit for inserting a resin sheet communicating with the inner peripheral surface of the hole portion from the outside in a tangential direction,
The block is divided into a plurality of mold parts with a direction parallel to the axial direction of the hole part as a dividing surface, and the mold part arranged on one slit side of the hole part is inserted in the resin sheet Or can be moved so as to open the hole in the direction opposite to the direction, and the mold part arranged on the other side of the hole can move outside through the hole,
A mold for manufacturing an outer tube, wherein the resin sheet is inserted into the hole from the slit and rounded into a tube along the inner peripheral surface of the hole.   A first inner surface having a hole portion having a substantially cylindrical space and a slit communicating with the inner peripheral surface of the hole portion from the outside in a tangential direction, the slit continuing to the inner peripheral surface in the tangential direction And a second inner surface facing the first inner surface and spaced apart from the first inner surface so that a resin sheet can be inserted, and from the slit into the hole A method for producing an exterior tube, comprising inserting a resin sheet, rolling the resin sheet into a tube shape along the inner peripheral surface of the hole, and heating the resin sheet in this state to form a resin tube.   6. The outer tube manufacturing method according to claim 5, wherein the heating temperature is increased to a temperature in a plastic deformation region of the resin tube. And the hole having a substantially cylindrical space, and a slit communicating with the tangential direction to the inner peripheral surface of the hole portion from the outside, multiple gold as a dividing plane direction parallel to the axial direction of the hole Using a mold that can be divided into mold parts, while inserting the resin sheet into the hole part from the slit, the resin sheet is rolled into a tube shape along the inner peripheral surface of the hole part, and the resin is in that state. The sheet is heated, and after the heating, a part of the mold is moved so as to open the hole on the slit side, and the resin sheet rolled into a tube shape from the side opposite to the open side A method for producing an outer tube, wherein the outer tube is pushed out by another mold part and is discharged to the outside or moved to a cooling device and cooled to form a resin tube.

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