JP2019155605A - Production method of inner fitting component, production method of intermediate component for inner fitting component, mold, intermediate component and cutting blade - Google Patents

Abstract

To provide a method to produce an inner fitting component, which enables production of an inner fitting component with improved surface smoothness in a simple way, a method to produce an intermediate component for the inner fitting component, a mold, an intermediate component and a cutting blade.SOLUTION: A method to produce an inner fitting component includes a process of molding by a blow mold 1 which has cavities 12, 22 and pinch-off parts 14, 24 with protrusion forming parts (inclining parts 142, 242) arranged on both ends of the cavities 12, 22 respectively, and a process of removing protrusions, formed by the protrusion forming parts, from the formed component, formed by the blow mold 1.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for producing an internally fitted component, a method for producing an intermediate component for an internally fitted component, and a mold, an intermediate component, and a cutting blade.

  Conventionally, as a method for manufacturing a molded part, bonded blow molding in which a parison is sandwiched between pinch-off portions and molded has been used. For example, Patent Document 1 discloses a blow molding die provided with a convex pinch-off portion that is disposed on the surface of a pair of molds and sandwiches a parison suspended from a die and a skin material. .

Japanese Patent Laid-Open No. 11-309773

  However, when, for example, a cylindrical pipe for internal fitting is manufactured by the above-described blow molding, a streak-like dent along the parting line may be generated around the pinched off parting line. If this pipe with a streak-like dent is fitted and fitted to a hose or the like that flows cooling water, etc., it is assumed that water leakage will occur from the dent, so the fitting part will be smooth without the dent. It is preferable to make it. As an example of countermeasures, there is a method of cutting the outer periphery of the fitting part of the pipe over the entire circumference according to the amount of the dent, but in that case, it is necessary to increase the thickness of the pipe including the cutting allowance. In addition, there is a lot of waste in terms of processing time and the like, and the effort to control the wall thickness also occurs.

  Therefore, in view of the above points, the present invention provides a method for producing an internal fitting component and an intermediate for the internal fitting component, which can produce an internal fitting component having improved outer surface smoothness by a simple method. It is an object of the present invention to provide a method for manufacturing a part, a mold, an intermediate part, and a cutting blade.

  The method of manufacturing an internally fitting component according to the present invention includes a step of molding with a mold for blow molding including a cavity and a pinch-off portion provided with a projection forming portion on the cavity side, and molding with the mold And a step of removing the protruding portion formed by the protruding portion in the portion.

  The method for producing an intermediate part for an internally fitting part according to the present invention is such that the projection forming part is molded by a blow molding die comprising a cavity and a pinch-off part having a projection forming part on the cavity side. The method includes a step of obtaining a molded part having a protruding part formed by the above method.

  The metal mold | die of this invention is equipped with a cavity and the pinch-off part which provided the projection formation part in the said cavity side, It is characterized by the above-mentioned.

  The intermediate part of the present invention is an intermediate part for an internal fitting part, and has a columnar outer surface, and a protrusion having a parting portion at the tip is formed on the outer surface. Features.

  The cutting blade of the present invention has a cylindrical main body having the same inner diameter as the outer surface of the part to be processed, and a protrusion protruding from the outer surface of the part to be processed so as to remove the protrusion. And a blade portion provided in the radial direction on the distal end surface.

  According to the present invention, a method for manufacturing an internal fitting component and a method for manufacturing an intermediate component for an internal fitting component, which can manufacture an internal fitting component whose outer surface smoothness is improved by a simple method, In addition, a mold, an intermediate part, and a cutting blade can be provided.

It is a figure which shows the fitting components which concern on embodiment of this invention. It is a plane schematic diagram of the split mold which concerns on embodiment of this invention. It is sectional drawing of the metal mold | die in the III-III cross section position of the split mold of FIG. 2 which concerns on embodiment of this invention. It is a perspective view of the cutting blade which concerns on embodiment of this invention. It is a figure which shows the cutting blade which concerns on embodiment of this invention, (a) is the front view which looked at the cutting blade from the main-body part side, (b) is Vb-Vb cross section of the cutting blade of Fig.4 (a). FIG. It is a figure which shows the manufacturing process of the intermediate | middle components and fitting components which concern on embodiment of this invention. It is a figure which shows the manufacturing process of the intermediate part which concerns on embodiment of this invention, (a) shows the state which has arrange | positioned the parison in a metal mold | die, (b) shows the state which made the metal mold | die clamp. It is a figure which shows the manufacturing process of the intermediate component which concerns on embodiment of this invention, (a) shows the state which made air flow in in a parison, (b) shows the state which opened the metal mold | die. It is a figure which shows the manufacturing process of the fitting component which concerns on embodiment of this invention, (a) shows the intermediate part immediately after shaping | molding with a metal mold | die, (b) shows the intermediate part which removed the blowing bag part. It is a figure which shows the cutting process of the intermediate part which concerns on embodiment of this invention, (a) shows a mode that an intermediate part is made to approach a cutting blade, (b) shows a mode that a projection part of an intermediate part is cut, (C) shows a state in which the protrusion of the intermediate part has been cut to the reduced diameter side. It is a figure which shows the manufacturing process of the fitting component which concerns on embodiment of this invention, (a) shows the fitting component which removed the projection part from the intermediate part, (b) removed the projection part from the intermediate part, The fitting component in which a part of protrusion part remained is shown.

  Hereinafter, modes for carrying out the present invention will be described. FIG. 1 is a view showing an internally fitting component 41B manufactured by the manufacturing method of the present embodiment. The fitting component 41B is formed in a long cylindrical shape using a blow molding die 1 and a cutting blade 30 described later. As shown in FIG. 1, the fitting component 41 </ b> B can form a liquid or gas flow path by fitting a cylindrical component such as a hose H into the fitting portion 412. As shown in the enlarged view of the portion A, the fitting portion 412 has a smooth outer surface 412b. Therefore, even if the hose H or the like is connected by an internal fitting, leakage of liquid or gas flowing through the inside can be prevented. Hereinafter, the mold 1 and the cutting blade 30 for manufacturing the fitting part 41B, and the manufacturing method of the intermediate part 41A formed in the process of manufacturing the fitting part 41B and the fitting part 41B using them will be described. To do.

  FIG. 2 is a schematic plan view of the split mold 10. In FIG. 2, one end side of the long cavities 11, 12, 13 is shown, and the other end side is omitted from the drawing. FIG. 3 is a cross-sectional view of the mold 1 taken along the line III-III of the split mold 10 of FIG. FIG. 3 shows one split mold 10 of the mold 1 and the other split mold 20 facing the split mold 10.

  In FIG. 2, the split mold 10 has concave arcuate cavities 11, 12, and 13. The cavity 11 is a large-diameter region for molding the main body 411 (illustrated in FIG. 1 and the like) of the fitting component 41B. The cavity 12 is a small-diameter region that is coaxially connected to the cavity 11 and forms a fitting portion 412 that is an end portion of the fitting component 41B. The cavity 13 is an area where a blowing bag portion 413 for arranging a needle or the like for sending air into the parison 40 is formed. As shown in FIG. 3, the cavity 22 of the split mold 20 is formed so as to be symmetrical with the cavity 12 of the split mold 10. Although not shown, the other cavities of the split mold 20 disposed opposite to the cavities 11 and 13 of the split mold 10 are also formed to have a symmetrical shape.

  In FIG. 3, the cavities 12 and 22 are each formed in a substantially semicircular concave arc shape, and are formed so as to have a substantially circular shape in a sectional view in a clamped state. The split molds 10 and 20 have pinch-off portions 14 and 24 on both outer edges of the cavities 12 and 22. Further, the divided molds 10 and 20 have escape portions 15 and 25 for releasing the burr portion outside the pinch-off portions 14 and 24.

  The pinch-off parts 14 and 24 are contact parts 141 and 241 that come into contact when the divided molds 10 and 20 are clamped, and inclined parts 142 and 242 provided on the cavity 12 and 22 side from the contact parts 141 and 241. And inclined portions 143 and 243 provided on the escape portions 15 and 25 side from the contact portions 141 and 241. The contact portions 141 and 241 of the present embodiment are formed flat. The inclined portions 142 and 242 are substantially V-shaped projections whose width in a sectional view gradually becomes narrower toward the contact portions 141 and 241 that are meshing portions of the pinch-off portions 14 and 24 when clamping. A forming part is formed. The valley portion of the protrusion forming portion of the present embodiment is formed at an obtuse angle by the inclined portion 142 and the inclined portion 242.

  The escape portions 15 and 25 have narrow portions 151 and 251 and wide portions 152 and 252 and are formed in two stages of width. The narrow portion 151 is connected to the inclined portions 143 and 243 of the pinch-off portions 14 and 24. The wide portions 152 and 252 are connected to the narrow portions 151 and 251 through the inclined portions 153 and 253. The contact portions 141 and 241, the narrow portions 151 and 251, and the wide portions 152 and 252 can be formed so as to be substantially parallel to each other. Further, the widths of the narrow portions 151 and 251 can be formed to be slightly wider than the width of the inner edge of the protrusion forming portion formed by the inclined portions 142 and 242. The widths of the narrow portions 151 and 251 do not excessively restrict the flow of the parison 40 to the escape portions 15 and 25 shown in steps S01 and S02 (FIGS. 7A and 7B) described later. In addition, when the wall thickness of the parison 40 is increased, the width can be increased. In addition, the width of the narrow portions 151 and 251 can be reduced when the thickness of the parison 40 is reduced in order to promote the flow of the parison 40 into the cavities 12 and 22.

  FIG. 4 is a view showing the cutting blade 30. FIG. 5A is a front view of the cutting blade 30 viewed from the main body 31 side, and FIG. 5B is a Vb-Vb cross-sectional view of the cutting blade 30 of FIG.

  The cutting blade 30 has a main body 31 that is open on the distal end surface 31a side, and a proximal end portion 32 that is connected to the main body 31 on the side opposite to the distal end surface 31a. The main body 31 has a bottomed hollow portion 311 and is formed in a substantially cylindrical shape as a whole. An introduction portion 312 inclined in a chamfered shape is provided on the inner edge 31b of the hollow portion 311 on the distal end surface 31a side.

  In FIG. 5A, a groove portion 313 is formed on the distal end surface 31a of the main body portion 31 linearly from the inner edge 31b to the outer edge 31c. The groove portions 313 are provided at three locations at substantially equal angles around the central axis of the hollow portion 311. Each groove 313 is formed in a substantially rectangular concave shape. The edge portion “a” of the groove portion 313 in FIG. 5A on the front side clockwise direction is formed from the center of the hollow portion 311 toward the radial direction. The opposite edge b facing the edge a of the groove 313 is formed to be parallel to the edge a. As shown in FIG. 5B, the bottom of the groove portion 313 is inclined so as to become deeper toward the hollow portion 311 side. The edge a of the groove 313 functions as the blade 314. Further, a concave groove 315 having a rectangular cross-sectional view in FIG. 5B is formed on the outer surface of the main body portion 31 in the circumferential direction.

  The base end portion 32 is formed in a columnar shape and is formed so as to protrude from the main body portion 31 so as to be coaxial with the hollow portion 311. The cutting blade 30 is used by being rotated in the counterclockwise direction when viewed from the front in FIG. 5A by connecting a rotating shaft to the base end portion 32 via a chuck or the like (not shown).

  FIG. 6 is a diagram showing a manufacturing process of the intermediate part 41A and the fitting part 41B. In steps S01 to S05, the intermediate part 41A can be manufactured by blow molding, and in steps S01 to S06, the fitting part 41B can be manufactured by blow molding and cutting. Hereafter, each process (step S01-S06) is demonstrated, referring FIGS. 7-11.

  First, in step S01, the parison 40 formed of a thermoplastic material is disposed between the cavities 12 and 22 of the split molds 10 and 20 shown in FIG. The parison 40 is disposed across the cavities 11, 12, and 13 shown in FIG. The parison 40 can be molded by an appropriate extrusion molding device or the like. In addition, the parison 40 of the present embodiment has an outer diameter larger than the inner diameter of the cavities 12 and 22 and is disposed across the relief portions 15 and 25 on both sides of the cavities 12 and 22.

  In step S02, the mold 1 is clamped. Then, the periphery of the both outer side portions 40a, 40b of the parison 40 is sandwiched between the pinch-off portions 14, 24, and the contact portions 141, 241 are engaged with each other to separate the molding portion 41 and the burr portion 42 ( (Refer FIG.7 (b)). Further, part of the parison 40 sandwiched between the pinch-off parts 14 and 24 flows toward the cavities 12 and 22, and the other part flows inside the escape parts 15 and 25 toward the wide parts 152 and 252. .

  Since the burr 42 is sandwiched between the narrow sections 151 and 251 having a large flow path resistance, the burr 42 flows excessively in the direction of the escape sections 15 and 25 when the pinch-off sections 14 and 24 sandwich the parison 40. Can be prevented. Therefore, the occurrence of sink marks on the inner peripheral surface of the molded part 41 corresponding to the pinch-off parts 14 and 24 can be reduced, and the thickness of the molded part 41 can be prevented from being reduced and the strength being lowered. The part of the burr part 42 that cannot be accommodated in the narrow parts 151, 251 can flow into the wide parts 152, 252.

  In step S03, air is caused to flow into the molding portion 41 of the parison 40, and the molding portion 41 is molded into an outer shape along the inner walls of the cavities 12 and 22 (see FIG. 8A). The blow-up needle can be inserted or stabbed into the parison 40 arranged on the cavity 13 side shown in FIG. When the pressure in the molding part 41 rises, the molding part 41 is urged toward the inner surfaces of the cavities 12 and 22, and the difference in thickness of the molding part 41 decreases. In addition, a protrusion 412a is formed on the outer surface 412b of the molding portion 41 by the protrusion forming portions (inclined portions 142 and 242).

  In step S04, the mold 1 is opened, and the molding part 41 and the burr part 42 are separated from the split molds 10 and 20 and removed. FIG. 9A shows the molded part 41 in a die-cut state. The molding part 41 includes a main body part 411, a fitting part 412, and a blowing bag part 413. The main body portion 411 is formed by the cavity 11, the fitting portion 412 is formed by the cavity 12, and the blowing bag portion 413 is a portion formed by the cavity 13.

  In step S05, the blow bag part 413 side where the needle is arranged in the molding part 41 shown in FIG. 9A is cut at the cutting position CL including a part of the protruding part 412a, and FIG. The intermediate part 41A for the internal fitting part shown in FIG. Note that the intermediate part 41A of the present embodiment is formed in a long cylindrical shape, and the fitting portion and the blowing bag portion can be similarly configured on the other end side. The illustration of the other end side of the intermediate part 41A is omitted.

  In FIG. 9B, the intermediate part 41A has a main body part 411 and a fitting part 412 and is formed in a substantially cylindrical shape as a whole. The fitting portion 412 communicates with the main body portion 411 via a reduced diameter portion 411a formed by the inclined portion 11a (see FIG. 2) of the divided mold 10 and the inclined portion (not shown) of the divided mold 20. Established. On the outer side surface 412 b of the fitting portion 412, a protruding portion 412 a having a substantially isosceles triangle shape in cross section is formed. Each protrusion 412a is formed from the tip 412c of the fitting portion 412 to the reduced diameter portion 411a.

  As shown in FIG. 3 and the like, the bottoms of the protrusion forming portions (inclined portions 142 and 242) are formed at an obtuse angle. Therefore, the protrusion 412a is formed in a substantially isosceles triangle shape with the outer surface 412b side as the base 51 and the top 53 as an obtuse angle in a front view where the cut surface shown in the enlarged view of the B portion appears.

  The parting part PL of the intermediate part 41 </ b> A is formed across the main body part 411 and the fitting part 412. Moreover, the parting part PL of the fitting part 412 is formed along the ridge which is the top part 53 of the projection part 412a. A concave groove 531 is formed on the upper and lower sides of the parting part PL. For example, when the parison 40 is cut by the pinch-off portions 14 and 24, the two recessed grooves 531 are in contact with the periphery of the bottom of the projection forming portion (inclined portions 142 and 242) of the parison 40, and the region where the hardening has progressed. A part of the parison 40 that is pushed into the cavities 12 and 22 and dents and flows out from between the pinch-off parts 14 and 24 connected to the central part of the dent until just before cutting is a protrusion having a parting part PL at the tip. It is thought that it is formed by curing in a state. The concave groove 531 is formed along the ridge of the protruding portion 412a, like the parting portion PL. The protrusion 412a is formed to be higher than the depth of the concave groove 531. Accordingly, the fitting portion 412 is formed in a cylindrical shape as a whole, and can prevent the concave groove 531 from being formed on the cylindrical outer surface 412b.

  In step S06, the protrusion 412a of the fitting portion 412 is removed by cutting. Here, the cutting process of the intermediate part 41A, which is the part to be processed in step S06, will be described with reference to FIG.

  FIG. 10A shows a state in which the intermediate part 41 </ b> A enters the cutting blade 30. In addition, about the cutting blade 30, the XX cross section of the cutting blade 30 of Fig.5 (a) is shown. First, the cutting blade 30 is rotated counterclockwise as viewed from the front as viewed from the main body 31. Then, the fitting part 412 of the intermediate part 41 </ b> A enters the hollow part 311. At this time, the intermediate part 41A is centered by the introduction part 312. The inner diameter of the inner surface 311 a on the distal end surface 31 a side of the hollow portion 311 is formed to be substantially the same as the outer diameter of the outer surface 412 b of the fitting portion 412. The inner diameter of the inner surface 311b on the proximal end 32 side of the hollow portion 311 is formed larger than the inner diameter of the inner surface 311a on the front side.

  FIG. 10B shows a state in which the protrusion 412a of the intermediate part 41A is cut. When the fitting portion 412 enters the hollow portion 311, the protruding portion 412 a that protrudes radially outward from the outer surface 412 b enters the rotational track of the blade portion 314 of the cutting blade 30, and thus the protruding portion 412 a is a blade portion. 314 is removed by cutting from the tip 412c side. When the intermediate part 41A is further advanced toward the inside of the hollow portion 311, the protruding portion 412a on the reduced diameter portion 411a side is also removed by cutting. The fitting portion 412 from which the protruding portion 312 a is removed and the outer side surface 412 b is smoothed sequentially moves into the hollow portion 311.

  FIG. 10C shows a state in which the protruding portion 412a of the intermediate part 41A is cut to the reduced diameter portion 411a side. When the intermediate part 41A is moved to a position where the distal end surface 31a of the main body part 31 and the reduced diameter part 411a of the intermediate part 41A are close to each other, substantially all of the protrusions 412a in the fitting part 412 are removed, and the fitting part 412 The outer side surface 412b is in a smooth state. Similarly, the fitting portion on the other end side opposite to the fitting portion 412 of the intermediate part 41A can be processed by the cutting blade 30 so that the outer surface becomes smooth.

  Fig.11 (a) is a figure which shows the fitting component 41B manufactured with the manufacturing method which concerns on this embodiment. The fitting component 41B is a component obtained by cutting and removing the protrusion 412a in step S06. The fitting part 412 of the fitting part 41 </ b> B, which is a finished product, has a smooth outer surface 412 b without the groove 531 because the protrusion 412 a having the groove 531 is cut. Therefore, when the fitting component 41B is fitted in a hose H formed of a soft member such as rubber, it is possible to prevent a gap between the inner surface of the hose H and the outer surface 412b.

  As described above, according to the present embodiment, the mold 1 for molding the fitting component 41B is formed on the outer surface 412b of the fitting portion 412 by forming the parting portion PL on the protrusion 412a of the fitting component 41B. It is possible to prevent the formation of a dent and to reduce the occurrence of sink marks on the inner surface of the fitting part 41B in the parting portion PL. In addition, since the fitting portion 412 can be accurately positioned by the introduction portion 312 provided in the opening of the cutting blade 30 during cutting, the centering of the intermediate component 41A that is a hollow component is facilitated, and the rotating cutting blade 30 is By the blade part 314 provided in the slit-like groove part 313, the protrusion part 412a can be removed without sharply cutting the outer surface 412b. The fitting component 41B in which the fitting portion 412 is formed in this way can easily manufacture the inner fitting component 41B with improved outer surface smoothness by a simple process. Even when the hose H is connected to the fitting component 41 </ b> B, it is possible to prevent leakage of gas or liquid flowing through the inside.

  Further, according to the present embodiment, the outer surface 412b of the fitting portion 412 that is the end portion of the fitting component 41B can be smoothed by partial processing only around the parting portion PL. This can be reduced compared to the case where the entire circumference of the side surface 412b is cut. And since it is not necessary to thicken the shaping | molding part 41 previously for cutting of the outer surface 412b, use of a molding material can be saved.

  Moreover, in this embodiment, since the introducing | transducing part 312 was provided in the cutting blade 30, positioning of components to be processed is easy. Therefore, in order to use as a guide for centering when performing external cutting, it is possible to omit primary processing inside the cylinder of the part to be processed. And it can prevent that cutting waste mixes in the inside of a product by omitting the primary processing inside.

  Note that the cross-sectional shape of the protrusion 412a can be such that the top 53 has a substantially right angle or an acute angle, but the top 53 is preferably an obtuse angle. As the angle of the top 53 becomes smaller, the side surface 52 of the projection 412a shown in FIG. 9B approaches the outer surface 412b perpendicularly. If it does so, the part which the side surface 52 and the blade part 314 contact | abut at the time of cutting will approach surface contact, and the resistance concerning the cutting blade 30 will become large. On the other hand, as shown in the present embodiment, when the top portion 53 is formed at an obtuse angle, the side surface 52 having a small inclination angle of the projection 412a approaches parallel to the outer surface 412b. If it does so, the part which the side surface 52 and the blade part 314 contact | abut at the time of cutting approaches line contact or point contact, and the resistance concerning the cutting blade 30 can be made small.

  Further, in the step of removing the protruding portion 412a in step S06, when the intermediate part 41A enters the inner surface 311a of the cutting blade 30, it is assumed that the remaining portion of the protruding portion 412a is generated due to a slight shift of centering or the like. FIG. 11B shows a fitting component 41B in which the protruding portion 412a is removed from the intermediate component 41A and a part of the protruding portion 412a remains. As shown in the enlarged view of part C when the fitting part 412 is viewed from the front end 412c side, a part of the protruding part 412a on the bottom 51 side remains as a residual part 54. The remaining portion 54 is formed in a thin substantially trapezoidal shape with the cutting surface 541 as an upper base in a front view. Step portions 542 are formed at the upper and lower ends of the remaining portion 54.

  The protrusion 412a is preferably formed so that the angle formed by the outer surface 412b and the side surface 52 is increased. When the angle formed by the outer side surface 412b and the side surface 52 is large (for example, an angle of 135 ° or more), the remaining portion 54 is hardly noticeable as a trace of cutting, and the fitting component 41B is formed on a hose H formed of a soft member such as rubber. When the inner fitting is performed, compared to the case where the concave groove is formed directly on the outer surface 412b or the case where the remaining portion 54 is formed with a small angle formed between the outer surface 412b and the side surface 52 (for example, an angle smaller than 135 °), Adhesion between the inner surface of the hose H and the outer surface 412b is improved, and the generation of gaps can be reduced. In such a case, even the fitting component 41 </ b> B having the remaining portion 54 can prevent leakage of liquid or the like flowing through the inside.

  Further, the concave groove 531 is formed at the time of molding the molding part 41 in which two parisons 40 are sandwiched between the pinch-off parts 14 and 24 of the mold 1. Since the depth of the recessed groove 531 increases as the thickness of the fitting portion 412 increases, it is desirable that the protruding portion 412 a also increase in proportion to the thickness of the fitting portion 412.

  The protruding portion 412a can be formed larger by increasing the protruding portion (the inclined portions 142 and 242 in FIG. 3) provided in the pinch-off portions 14 and 24. If the protrusion 412a is too small compared to the wall thickness, the groove 531 penetrates the protrusion 412a and reaches the outer surface 412b, and the groove 531 remains fitted only by cutting and removing the protrusion 412a. The outer surface 412b of the joint 412 cannot be smoothed. On the other hand, if the protrusion 412a is too large compared to the wall thickness, sink marks generated on the inner peripheral surface corresponding to the position of the protrusion 412a of the fitting part 412 become large, and a part of the fitting part 412 becomes thin, When the protruding portion 412a is removed by cutting, it is assumed that cracks are generated on the outer surface 412b. Furthermore, if the protrusion 412a is large, the amount of shaving of the protrusion 412a increases. In consideration of such conditions, the protrusion 412a can be set in a size range that is higher than the depth of the groove 531.

  For example, the height of the protrusion 412a can be made smaller than the wall thickness within a range larger than the depth of the groove 531 such as about half the wall thickness of the fitting portion 412. Further, the length of the base 51 of the protrusion 412a is set to be approximately the same as or larger than the thickness of the fitting part 412 within a range in which the protrusion 412a having an obtuse angle at the top 53 can be formed on the outer surface 412b. be able to.

  Moreover, although this embodiment demonstrated the example which manufactures cylindrical inner fitting fitting components 41B, such as a hose coupling, the method of smoothing the outer surface of the rod-shaped body in which the inside in a rotating shaft, a connection shaft, etc. is not hollow. You may apply to. For example, instead of steps S01 to S03, a thermoplastic material is injected into the clamped divided molds 10 and 20, and then the same process as steps S04 to S06 of the present embodiment is performed, and then the fitting part is It may be manufactured. Thus, the fitting member manufactured by the method using the mold 1 and the cutting blade 30 can be used as an engaging portion that connects a plurality of components, for example. And since the clearance gap of the engaging part of the engaging part can be reduced, the connection strength of several components can be raised.

  In addition, the split molds 10 and 20 may be configured such that the inclined portions 142 and 242 are provided in a part on the cavity 13 side, and the protruding part 412a is formed in a part on the tip 412c side of the fitting part 412.

  Moreover, although the introduction part 312 of the cutting blade 30 was shown about the example which is R chamfering shape, the introduction part 312 is formed in the inside of the hollow part 311 in the taper shape of C chamfering shape etc. which incline in a cross-section substantially linear form. May be.

  Further, the embodiment described above is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Metal mold | die 10,20 Divided metal mold 11 Cavity 11a Inclination part 12,22 Cavity 13 Cavity 14,24 Pinch-off part 15,25 Escape part 30 Cutting blade 31 Main part 31a Front end surface 31b Inner edge 31c Outer edge 32 Base end part 40 Parison 40a Outer part 40b Outer part 41 Molding part 41A Intermediate part 41B Fitting part 42 Burr part 51 Bottom 52 Side 53 Top part 54 Remaining part 141, 241 Abutting part 142, 242 Inclined part 143, 243 Inclined part 151, 251 Narrow part 152 , 252 Wide portion 153, 253 Inclined portion 311 Hollow portion 311a Inner surface 311b Inner surface 311 Introducing portion 313 Groove portion 314 Blade portion 315 Concave groove 411 Main body portion 411a Reduced diameter portion 412 Fitting portion 412a Protruding portion 412b Outer side surface 412c Tip 413 Blow bag portion 531 Concave groove 541 Cutting surface 54 Step section H hose PL parting portion a rim b edge

Claims (8)

Molding with a mold for blow molding comprising a cavity and a pinch-off part provided with a projection forming part on the cavity side;
Removing the protrusions formed by the protrusion forming part in the forming part formed by the mold; and
The manufacturing method of the internal fitting component characterized by including. The molded part has a cylindrical outer surface on which the protrusions are formed,
The step of removing the protrusion includes a cylindrical main body having an inner diameter that is the same diameter as the outer surface, and a rotating cutting blade that includes a blade provided radially on the distal end surface of the main body. Is performed by inserting the molding part inside,
The manufacturing method of the internal fitting component of Claim 1 characterized by the above-mentioned.   The method of manufacturing an internally fitting component according to claim 1, wherein the protrusion has a triangular shape in cross section. The mold includes a narrow portion connected to the pinch-off portion and the outside, and a wide portion connected to the narrow portion,
The narrow portion allows a part of the parison to flow toward the cavity when the parison is cut at the pinch-off portion.
The method for manufacturing an internally fitted component according to any one of claims 1 to 3, wherein   Forming with a mold for blow molding comprising a cavity and a pinch-off part having a protrusion forming part on the cavity side, and obtaining a forming part having a protrusion formed by the protrusion forming part. A method for producing an intermediate part for an internally fitted fitting part. A cavity,
A pinch-off part provided with a protrusion forming part on the cavity side;
A mold characterized by comprising. An intermediate part for internal fitting parts,
Having a columnar outer surface,
On the outer surface, a protrusion having a parting portion at the tip is formed.
An intermediate part characterized by that. A cylindrical main body having the same inner diameter as the outer surface of the part to be processed;
A blade portion provided in a radial direction on the distal end surface of the main body portion so as to remove the protruding portion protruding from the outer surface of the part to be processed;
A cutting blade comprising:

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