JP4281051B2 - Punching machine and method of manufacturing roller with shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a drilling machine for drilling a bottomed hole or a through hole in a molded body of a required shape made of an appropriate synthetic resin.And manufacturing method of roller with shaft using this punching machineIt is about.
[0002]
[Prior art]
In various OA devices such as a facsimile machine and a copier, a roller for transferring paper is disposed on a paper feed line from a paper feed unit to a paper discharge unit. This roller is composed of, for example, a roller body made of a synthetic resin having elasticity as appropriate, such as urethane foam, and a shaft member penetratingly mounted along the central axis in the longitudinal direction of the roller body. The shaft member is rotatably arranged by supporting both end portions of the shaft member at predetermined positions.
[0003]
Here, the roller composed of the roller body and the shaft member is roughly divided into the following (1) to (3) when classified according to the manufacturing method.
(1) So-called insert molding in which the roller member is molded with the shaft member separately preformed set in a mold so that the shaft member is inserted through the roller body along its central axis. Manufactured based on
(2) After forming a solid cylindrical molded body constituting the roller body, a through hole is formed in the longitudinal direction along the central axis of the molded body, and the shaft member separately preformed in the through hole It is manufactured by mounting through.
(3) Manufactured by penetrating a preformed shaft member into a hollow cylindrical molded body in which through holes are simultaneously formed by a molding die.
Of these, regarding the manufacturing method of (2) above, as a drilling method for drilling the through hole along the central axis in the longitudinal direction of the solid cylindrical shaped molded body, (a) parting off with a cylindrical single blade (B) Drilling with a screw blade or the like was employed. A technique related to this is disclosed in, for example, Patent Document 1.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 06-218656
[0005]
[Problems to be solved by the invention]
By the way, in each drilling machine that implements each of the drilling methods (a) and (b) described above, the following problems are inherent. First, in the punching machine that performs the drilling method of (a), although it is suitable for drilling a through hole in a molded body formed from a relatively soft synthetic resin, a through hole in a molded body formed from a somewhat hard synthetic resin Drilling is impossible. Specifically, it can be applied only to a molded body formed from a synthetic resin of 20 degrees or less on the Asker C scale, and there is a problem that the processing application range is limited to a soft material. On the other hand, in the punching machine that performs the drilling method of (b), although it can correspond to a molded body formed of a relatively hard synthetic resin, the screw blade that rotates at high speed is worn because it contacts the synthetic resin during drilling. In general, it is necessary to replace the punching process approximately every 100 times, and there are problems such as a reduction in processing efficiency and an increase in processing cost associated with the tool replacement work. In particular, in a punching machine that implements each of the above-described drilling methods (a) and (b), drilling a long through hole with a drilling length of about 300 to 400 mm, or a narrow through hole with a hole diameter of about 5 to 7 mm In the operation of drilling, there are common problems such as the drilled through hole and the bottomed hole are curved and the hole diameter is not constant.
[0006]
Therefore, as a solution to the problems inherent in each of the above-described drilling methods, a drilling machine adopting a hot melt processing method is equipped, that is, an electric heater or a heat medium circulation circuit, etc., so that the tip of the drilling rod is made of synthetic resin. There has been proposed a drilling machine for drilling a through-hole or a bottomed hole having a required length and a required diameter in the molded body while being heated to the melting temperature or higher. However, in the drilling machine having such a configuration, in the case of the narrow and small diameter drilling rod for drilling the above-described small diameter through hole or the like, it is difficult to supply sufficient heat due to the small heat capacity. There was a problem that the tip of the rod could not be maintained at a temperature equal to or higher than the melting temperature of the molded body, and the above-described drilling operation for a long or small through hole or bottomed hole could not be handled.
[0007]
OBJECT OF THE INVENTION
  The present invention has been proposed to suitably solve the above-described problems. Based on the principle of induction heat generation, the perforation member is induction-heated by an induction coil in a non-contact state, and the perforation member heated to a predetermined temperature is pressed. A drilling machine that can expand the processing application range, improve the processing efficiency, reduce the processing cost, etc. by making the through hole or the bottomed hole in contact with each otherAnd manufacturing method of roller with shaft using this punching machineThe purpose is to provide.
[0008]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems and achieve the intended purpose, the present invention provides:
  TogetherMade of synthetic resinRuA drilling machine for drilling a through hole or a bottomed hole in a shape,
  A first support that can hold the molded body as a set;
  A second support provided with a perforation device that is installed so as to be close to and away from the first support, and that drills the through hole or the bottomed hole in the molded body;
  The punching device is
  Arranged in the second support aligned in the proximity / separation direction of the two supports,A rod member and attached to the tip of the rod memberPerforated member made of magnetic materialBe equippedA perforating rod
  An induction coil installed at a position surrounding the perforated member to allow passage of the molded body, and to induce the heat generation of the perforated member above the softening temperature of the molded body;
  The first support body and the second support body on which the molded body is set are moved close to each other while the perforation member is heated by induction heat and maintained at a temperature equal to or higher than the softening temperature. The through hole or the bottomed hole can be formed by pressing the molded body.,
  The rod member can be attached to the molded body as it is after being pierced with the through hole or the bottomed hole in the molded body and then being removed from the second support body.It is characterized by that.
  In order to solve the above problems and achieve the intended purpose, another invention of the present application is:
  A method of manufacturing a roller with a shaft by drilling a through hole or a bottomed hole in a molded body made of a synthetic resin,
The molded body is set and held on the first support,
A piercing rod provided with a rod member attached to a tip of a piercing member made of a magnetic material, provided on a second support body that is installed so as to be close to and away from the first support body. Align in the proximity and separation direction of both supports against
An induction coil installed at a position surrounding the piercing member and allowing the molded body to pass therethrough, the piercing member is inductively heated, and the piercing member is maintained at a temperature equal to or higher than the softening temperature of the molded body;
The first support body and the second support body on which the molded body is set are moved close to each other, and the through hole or the bottomed hole is formed by pressing the punching member against the molded body.
After the through hole or the bottomed hole is formed in the molded body, the rod member is detached from the second support body and attached to the molded body as it is.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
  Next, the drilling machine according to the present inventionAnd manufacturing method of roller with shaft using this punching machineA preferred embodiment will be described below with reference to the accompanying drawings.
[0010]
FIG. 1 is a perspective view schematically showing the overall configuration of a drilling machine according to a preferred embodiment of the present invention. The punching machine 10 of the present embodiment is a solid cylinder as illustrated in FIG. 9A in a basic configuration in which a through hole or a bottomed hole is drilled in a molded body of a required shape made of a suitable synthetic resin. A hollow cylindrical body U1 (FIG. 9 (b)) is formed by forming a through-hole S1 along a central axis in the longitudinal direction of a molded body U made of urethane foam that is foam-molded into a body shape, Alternatively, a bottomed hollow cylindrical body U2 (FIG. 9 (c)) can be formed by drilling a bottomed hole S2 having a required length along the central axis in the longitudinal direction of the molded body U. . That is, the hollow cylindrical body U1 and the bottomed hollow cylindrical body U2 formed by the punching machine 10 according to the embodiment can be implemented as, for example, a roller main body that constitutes the roller described above.
[0011]
Specifically, the punching machine 10 of the present embodiment is installed so that the solid cylindrical body-shaped molded body U can be set and held, and the first support 12 can be brought close to and away from each other. The second support 14 is provided with a punching device 40 for drilling the through hole S1 or the bottomed hole S2 along the central axis in the longitudinal direction of the molded body U. The first support 12 and the second support 14 are arranged in series with respect to a support frame (not shown), and the second support 14 is fixed to the frame, while the first support 12 Is configured so that it can be moved close to and away from the second support 14.
[0012]
As illustrated in FIGS. 2 and 3, the first support 12 includes a first half 20 </ b> A and a second half 20 </ b> B that are separable in the longitudinal direction and can be assembled to each other by appropriate assembly fixing means. A cylindrical holding member 20 having a housing portion 22 in which the molded body U can be housed, and a support member connected to the tip of a rod 18 of a fluid pressure actuator 16 such as a hydraulic cylinder fixed to a frame or the like. 24. After the cylindrical holding member 20 is assembled into a cylindrical body by joining the first half 20A and the second half 20B to the end, the boss-like convex part 26 protruding from the support member 24 is formed in the first cylindrical body 20A. By being fitted into the inside from the opening of the first end 20a, the second end 20b on which the opening 21 is formed is supported in a horizontal state directed toward the second support 14. As a result, when the fluid pressure actuator 16 is controlled so that the rod 18 moves forward, the first support 12 moves close to the second support 14 along its central axis, which will be described later with reference to FIG. As illustrated in a) and (b), it is slidably inserted into a cylindrical guide member 36 provided on the second support 14. Further, when the fluid pressure actuator 16 is controlled so that the rod 18 moves backward, the fluid pressure actuator 16 moves away from the second support body 14 along the central axis thereof, and is extracted from the cylindrical guide member 36. .
[0013]
The first half body 20A and the second half body 20B constituting the cylindrical holding member 20 are formed of a nonmagnetic material made of, for example, FRP (glass fiber or carbon fiber reinforced epoxy resin, polyester resin). Yes. The inner diameter E1 of the assembled cylindrical holding member 20 is set to be about 0.2 mm larger than the outer diameter D of the molded body U (E1 = D + 0.2 mm). Accordingly, the molded body U accommodated and held in the accommodating portion 22 is held from the vertical direction by the first half body 20A and the second half body 20B, and is partially deformed or entirely bent. It is properly held in a straight state in which deformation or the like is prevented. The convex portion 26 of the support member 24 has a punching member 44 (described later) in the punching device 40 when the first support 12 is most advanced toward the second support 14 (FIGS. 4 and 7). A recess 28 that allows entry is formed. Further, since the cylindrical holding member 20 is a non-magnetic material as described above, no induced current is generated when passing through the magnetic flux generated in the induction coil 50 described later, and therefore no induction heat is generated. .
[0014]
As illustrated in FIGS. 2 and 3, the second support member 14 includes the first holding member 32 and the second holding member 32 at a predetermined interval in the longitudinal direction of the elongated plate-like base body 30 fixed to a frame or the like (not shown). A holding member 34 is fixed upright and a cylindrical guide member 36 is supported horizontally by using the holding members 32 and 34. As will be described later, when the cylindrical guide member 36 forms the through-hole S1 or the bottomed hole S2 in the molded body U by the punching device 40, the cylindrical guide member 36 accommodates and holds the molded body U. It is for guiding while holding and holding. Therefore, the cylindrical guide member 36 is supported so as to penetrate the first holding member 32 located on the first support 12 side, and extends so as to penetrate the inside of the induction coil 50 described later. The insertion port 38 opened at the first end 36a is directed to the first support 12 while the second holding member 34 is located on the opposite side of the first support 12. The second end 36b is connected to the end. The central axis in the longitudinal direction of the cylindrical guide member 36 supported by both the holding members 32 and 34 coincides with the central axis in the longitudinal direction of the cylindrical holding member 20.
[0015]
The cylindrical guide member 36 is formed of a nonmagnetic material made of, for example, stainless steel (SUS303), aluminum, glass, or the like, and may be disposed so as to extend inside the induction coil 50. Inductive current is not generated by the magnetic flux generated in the induction coil 50, and therefore no induction heat is generated. The inner diameter dimension E3 is set so that the cylindrical holding member 20 having the outer diameter dimension E2 can slide back and forth in a sliding contact state, and the fluid pressure actuator 16 is operated so that the rod 18 moves forward. When controlling, as illustrated in FIG. 4, the cylindrical holding member 20 moving forward along the central axis smoothly enters the cylindrical guide member 36. Thereby, the cylindrical holding member 20 gradually accommodated in the cylindrical guide member 36 is prevented from being displaced or bent in the radial direction on the side of the second end portion 20b which is a free end.
[0016]
The perforating apparatus 40 disposed on the second support 14 is in the proximity / separation direction of the first support 12 and the second support 14 (the direction along the longitudinal central axis of the cylindrical guide member 36). Are arranged on the second support 14 and are provided with a piercing rod 42 having a piercing member 44 made of a magnetic material at the tip, and at a position surrounding the piercing member 44, the molded body U and It is basically configured from an induction coil 50 that allows the cylindrical holding member 20 holding the molded body U to pass therethrough and causes the perforated member 44 to generate induction heat above the softening temperature T of the molded body U when the coil is energized. Has been. That is, the perforating apparatus 40 uses a known induction heat generation principle, and the induction coil 50 is energized with an alternating current of a predetermined frequency (50 Hz to 40 MHz) to generate a magnetic flux. It is arranged in a non-contact state, and an induction current is generated in the piercing member 44 existing in the magnetic flux, thereby causing the piercing member 44 to generate induction heat. Here, the above-mentioned softening temperature T or higher means that when the piercing rod 42 is pressed into contact with the molded body U, the piercing rod 42 is allowed to enter and the through hole S1 or the bottomed hole S is used. Is a temperature at which the formed body U is softened or melted by the piercing member 42. For example, when the molded body U is made of urethane foam, the piercing rod 42 is allowed to enter in a state where the molded body U is softened moderately, so that a drilling operation can be performed.
[0017]
The perforated rod 42 is provided with a heat insulating member 60 (described later) at the tip of a rod member 46 disposed so as to penetrate the inside of the cylindrical guide member 36 along the longitudinal central axis of the cylindrical guide member 36. At the same time, the perforating member 44 is attached to the heat insulating member 60. Accordingly, the perforating rod 42 causes the first support 12 to be in contact with the second support 14 while the perforating member 44 is inductively heated to a temperature equal to or higher than the softening temperature T while passing an alternating current through the induction coil 50. When the support bodies 12 and 14 are moved closer to each other and moved closer to each other, the portion of the molded body U that is in contact with the piercing member 44 is softened or melted to enter the inside thereof. Note that, based on the setting of the movement amount (stroke amount) of the first support body 12 when the first support body 12 and the second support body 14 move close to each other, the amount of penetration of the perforated rod 42 with respect to the molded body U is determined. Therefore, if the stroke amount is set large, the through hole S1 can be drilled, and if the stroke amount is set small, the bottomed hole S2 can be drilled. The through hole S1 or the bottomed hole S2 can be drilled. Can be selectively drilled.
[0018]
The rod member 46 is a pipe-like member set longer than the arrangement interval between the third support member 35 erected and fixed to the end portion of the base body 30 and the first holding member 32, 3 By allowing the rear end side to pass through the support member 35 and the second holding member 34, the cylindrical guide member 36 is supported so as to extend straight along the longitudinal axis, and attached to the front end. The piercing member 44 is made to face a substantially intermediate position of the induction coil 50. The outer diameter F1 is set to be smaller by 0.5 to 1.0 mm than the inner diameter B of the through hole S1 (or the bottomed hole S2) formed in the molded body U. For example, aluminum, copper, brass, It is made of a non-magnetic material made of stainless steel (SUS303), ceramics (alumina, etc.), and no induced current is generated even if it is present in the magnetic flux generated in the induction coil 50, and therefore no induction heat is generated. It is like that. The outer surface of the rod member 46 is coated with a coating layer 48 made of, for example, ceramics, and the inner wall surface of the molded body U that has been softened or melted by the perforating member 44 is in close contact with the rod member 46. It is designed to prevent seizure. The rod member 46 is screwed to the third support member 35 and is fixed by a nut 52.
[0019]
The perforating member 44 is formed in a cylindrical body shape having a spherical shape at the tip side, and has an outer diameter dimension substantially the same as the inner diameter dimension B of the through hole S1 (or bottomed hole S2) drilled in the molded body U. It is set to F2. Then, as illustrated in FIG. 5, a male screw 62 projecting from a heat insulating member 60 described later is screwed into a female screw 54 recessed on the rear side, so that the screw can be attached to the front side of the heat insulating member 60. . Such a perforated member 44 is formed of a magnetic material made of, for example, steel or the like, and is always disposed so as to exist in the magnetic flux generated by the induction coil 50. An induction current is generated and induction heat is generated. The outer surface of the perforated member 44 is coated with a coating layer 58 made of, for example, ceramics, fluororesin or epoxy resin, and the inner wall surface of the molded body U that has been softened or melted by the perforated member 44. The perforating member 44 is prevented from being stuck and burned. The material of the coating layer 58 is selected according to the heating temperature at the time of drilling work. When the heating temperature is high, ceramics or the like is adopted, and when the heating temperature is low, fluorine resin or epoxy resin or the like is adopted. Is done.
[0020]
As illustrated in FIG. 5, the heat insulating member 60 interposed between the perforating member 44 and the rod member 46 is a flange-like member formed of, for example, ceramics, fluororesin, epoxy resin, etc. The front end surface is provided with a male screw 62 that is screwed into the female screw 54 that is recessed in the perforating member 44, and the rear end surface is screwed into a female screw 56 that is recessed in the front end surface of the rod member 46. A male screw 64 is projected. A through hole 66 for inserting an electric wire is formed along the axis of the male screw 64 and the male screw 62. Such a heat insulating member 60 is located between the perforating member 44 and the rod member 46, so that heat of the perforating member 44 heated to the softening temperature T or more due to induction heat generation moves to the rod member 46. It functions to prevent the temperature of the perforating member 44 from decreasing and at the same time to prevent the temperature of the outer surface of the rod member 46 from increasing. Therefore, when the through hole S1 or the bottomed hole S2 is drilled in the molded body U, the temperature drop of the punching member 44 that has been induction-heated to the softening temperature T or higher is prevented, and the punching work by the punching member 44 is prevented. While the efficiency is improved, the rod member 46 is maintained at a temperature considerably lower than the softening temperature T. Therefore, the inner wall surface of the molded body U that is softened or melted by the perforating member 44 is The contact with the outer surface of the member 46 cools and accelerates the curing.
[0021]
In addition, a temperature sensor 68 for temperature detection is provided inside the punching member 44 as necessary, and can detect the temperature of the punching member 44 that has induced heat by the induction coil 50. . The electric wire 70 connected to the temperature sensor 68 is wired to the rear end side of the rod member 46 using the through hole 66 provided in the heat insulating member 60 and the internal space of the rod member 46. Yes.
[0022]
The induction coil 50 is formed by winding a copper tube having a diameter of about 6 mm, for example, in a spiral shape with a required diameter and a required pitch in order to form a required impedance. It is fixed to the base body 30 so as to be positioned substantially at the center inside thereof. And, as described above, the inner diameter dimension G is appropriately set larger than the outer diameter dimension E2 of the cylindrical holding member 20 (set appropriately larger than the outer diameter dimension of the cylindrical guide member 36). When the first support 12 is moved close to the second support 14, the cylindrical holding member 20 that accommodates and holds the molded body U can be allowed to pass therethrough, and the first holding body 12 does not come into contact with the cylindrical holding member 20. It has become. Further, both ends of the induction coil 50 are electrically connected to an AC current supply source (not shown), and when an AC current having a predetermined frequency suitable for the size of the punching member 44 is supplied from the AC current supply source, a magnetic flux is generated. Thus, the piercing member 44 existing in the magnetic flux can be induced to generate heat at the softening temperature T or higher. Note that the current applied to the induction coil 50 by the AC current supply source can be automatically or manually switched to 2A during standby, or 5A during drilling, and the heating time of the drilling member 44 can be changed. It is possible to shorten the drilling operation cycle accompanying the shortening.
[0023]
As described above, the perforating apparatus 40 mounted on the perforating machine 10 according to the embodiment applies the alternating current to the induction coil 50 based on the principle of induction heat generation, so that the perforation rod 42 in a non-contact state with the induction coil 50 can be obtained. The through-hole S1 or the bottomed hole S2 is formed by inducing heat generation of the piercing member 44 and pressing the piercing member 44 heated to a temperature equal to or higher than the softening temperature T against the molded body U. That is, if a predetermined alternating current is continuously supplied from the alternating current supply source to the induction coil 50, only the punching member 44 is always maintained at the softening temperature T or higher. Drilling of the through-hole S1 or the bottomed hole S2 having a small or small diameter can be suitably performed. In addition, since the through-hole S1 or the bottomed hole S2 can be drilled only by lightly pressing the molded body U against the drilling member 44, the load applied to the drilling rod 42 is reduced. The rod 42 is prevented from being bent and the like, and a straight through hole S1 or a bottomed hole S2 can be formed.
[0024]
[Effect of the embodiment]
Next, by the punching machine 10 of the present embodiment configured as described above, a through-hole S1 is drilled along the central axis in the longitudinal direction in the molded body U illustrated in FIG. 9A. The case where the hollow cylindrical body U1 illustrated in FIG. 9B is molded will be described with reference to FIGS.
[0025]
By controlling the fluid pressure actuator 16 so that the rod 18 is moved backward, the first support 12 is moved away from the second support 14, and the solid U-shaped molded body U which is separately preformed is formed. The first half 20A and the second half 20B are assembled so as to be sandwiched, and the molded body U is set and held in the accommodating portion 22 of the cylindrical holding member 20 (FIGS. 2 and 3). On the other hand, an alternating current having a predetermined frequency corresponding to the punching condition is supplied to the induction coil 50 from an alternating current supply source (not shown) to generate a magnetic flux in the induction coil 50, and is guided to the punching member 44 in the magnetic flux. An electric current is generated to inductively generate heat to the perforated member 44 to a required temperature equal to or higher than the softening temperature T.
[0026]
The setting operation of the molded body U with respect to the accommodating portion 22 of the cylindrical holding member 20 is completed, and the set current of the induction coil 50 is switched from the heat retention condition to the drilling condition, so that the punching member 44 has a required temperature equal to or higher than the softening temperature T. Is reached, the fluid pressure actuator 16 is controlled so that the rod 18 moves forward at a constant speed. As a result, the first support 12 moves closer to the second support 14 at a constant speed, and the second end 20b (tip) of the cylindrical holding member 20 holding the molded body U is set. However, it comes to enter the inside of the member 36 from the insertion port 38 of the cylindrical guide member 36 (FIG. 6A).
[0027]
Then, when the cylindrical holding member 20 is guided and advanced by the cylindrical guide member 36 and the second end portion 20b of the cylindrical holding member 20 reaches substantially the middle of the induction coil 50, the state shown in FIG. As shown, the tip of the piercing member 44 held at a temperature equal to or higher than the softening temperature T of the molded body U comes into contact with and is pressed at substantially the center of the side end surface of the molded body U. The body U becomes softened or melted from the site where the piercing member 44 comes into contact. Further, when the first support 12 is moved close to the second support 14 at a constant speed (when the formed body U is pressed against the perforated rod 42 with a constant pressure), the first support 12 is fixed to the second support 14. The piercing rod 42 gradually enters along the central axis in the longitudinal direction of the molded body U while the piercing member 44 presses and contacts the inside of the molded body U (FIG. 6C).
[0028]
When the first support 12 moves by a predetermined stroke amount and stops, the piercing member 44 protrudes from the other side end surface of the molded body U as illustrated in FIG. The piercing rod 42 completely penetrates the molded body U. Then, since the heated piercing member 44 enters the recess 28, the rod member 46 that is hardly heated comes to be located inside the molded body U, and is in a softened or melted state. The inner wall surface of the body U is cooled to promote curing.
[0029]
When the first support 12 is stopped, an alternating current having a predetermined frequency corresponding to the heat insulation condition is immediately supplied from the alternating current supply source to the induction coil 50 to switch the punching member 44 to the heat insulation state. Then, at an appropriate time, the fluid pressure actuator 16 is controlled so that the rod 18 is retracted, and the first support 12 is moved away from the second support 14 at a constant speed, and the perforated rod that has penetrated the molded body U. 42 is pulled out from the molded body U (FIG. 8). As a result, the through hole S1 is formed in the portion where the piercing rod 42 was present, and the formation of the hollow cylindrical body U1 illustrated in FIG. 9B is completed.
[0030]
[Example of drilling test]
The applicant of the present application conducted a drilling test under the following conditions using the drilling machine 10 having the above-described configuration.
1. Dimensions of molded body U and hollow cylindrical body U1
・ Total length L = 400mm
・ Outer diameter D = 16mm
・ Material = Polyurethane (Hardness: 20 degrees on Asker C scale)
・ Inner diameter B of through-hole S1 = 8mm
2. Specifications of drilling machine 10
・ Induction coil 50 inner diameter G = 32 mm
-Frequency applied to induction coil 50: 25 KHz
-Applied power to the induction coil 50: 10 kW
・ Applied current to induction coil 50: 2A when keeping warm
When drilling 5A
・ Outer diameter F2 of the perforated member 44 = 7.5 mm
-Transfer speed (drilling speed) of the first support 12: 2 m / min
[0031]
Thus, for the molded body U made of a relatively hard polyurethane of 20 degrees on the Asker C scale, the total length L = 400 mm and the inner diameter B = 8 mm along the longitudinal central axis of the molded body U. When the through hole S1 was drilled, the through hole S1 could be drilled in about 20 seconds. In addition, it has been demonstrated that the relatively long and small through-hole S1 can be drilled in a short time without bending.
[0032]
In this way, the punching machine 10 of the embodiment uses the induction heat generation principle to cause the punching member 44 arranged at the tip of the punching rod 42 to generate dielectric heat above the softening temperature T of the molded body U. Since the through-hole S1 or the bottomed hole S2 is formed by pressing the member 44 against the molded body U, even if the molded body U is formed from a relatively hard synthetic resin, a short time is required. In addition, the drilling operation can be completed without bending, and the processing application range can be expanded as compared with a conventional drilling machine. Further, when the through-hole S1 or the bottomed hole S2 is drilled in the molded body U, there is almost no wear of the drilling member 44, so that it is not necessary to frequently replace and maintain the drilling member 44, and processing efficiency. Can be improved and the processing cost can be reduced.
[0033]
As described above, the punching machine 10 of the embodiment continuously energizes the induction coil 50 with a predetermined alternating current continuously from the alternating current supply source, so that only the punching member 44 is always above the softening temperature T. Therefore, the long or narrow through hole S1 or the bottomed hole S2 can be suitably drilled. Moreover, since the through hole S1 or the bottomed hole S2 can be drilled simply by making the molded body U lightly press contact with the drilling member 44, the load applied to the drilling rod 42 is reduced. Thus, it is possible to prevent the straight through-hole S1 or the bottomed hole S2 from being drilled.
[0034]
In the punching machine 10 of the embodiment, the rod member 46 in the punching rod 42 is a hollow body, the through hole 66 is drilled in the heat insulating member 60, and the temperature sensor 68 is attached inside the punching member 44. Therefore, the temperature control and management of the piercing member 44 can be performed accurately.
[0035]
The induction heat generation temperature of the piercing member 44 is based on the principle of induction heat generation: (1) Increase / decrease setting of power and frequency of alternating current supplied to the induction coil 50, (2) Number of turns and diameter of the induction coil 50 (inner diameter) It can be appropriately changed and adjusted by setting the size G).
[0036]
Further, the perforating member 44 is not limited to the outer shape and size exemplified in the above embodiment, and when the molded body U is softened or melted efficiently when pressed against the molded body U, The shape may be a shape that can smoothly enter the molded body U, and may be, for example, a conical shape or a cylindrical shape.
[0037]
In the punching machine 10 of the above-described embodiment, the first support 12 for holding the molded body U is configured so as not to rotate around the axis line along the approaching / separating direction of both the supports 12 and 14. However, the first support 12 may be disposed so as to be rotatable about the axis. That is, when the first support 12 is configured to be rotatable, the molded body U set and held on the cylindrical holding member 20 of the first support 12 is rotated at a required rotation speed (for example, 100 to 150 rpm). Under the rotation, the piercing member 44 of the piercing rod 42 is allowed to enter the molded body U, so that the through hole S1 or the bottomed hole S2 can be formed. If the molded body U is rotated in this way, the tip of the piercing member 44 attached to the tip of the piercing rod 42 is always directed to the center of rotation of the molded body U, and has a long or small diameter. When drilling the through hole S1 or the bottomed hole S2, a drilling operation without bending can be performed.
[0038]
Further, in the punching machine 10 of the embodiment, the punching rod 42 for drilling the through-hole S1 or the bottomed hole S2 in the molded body U is centered on the axis along the approaching / separating direction of both supports 12 and 14. Although an example of a configuration that does not rotate is illustrated, the perforating rod 42 may be disposed so as to be rotatable about the axis. That is, when the perforated rod 42 is configured to be rotatable, a required rotational speed (for example, 100 to 150 rpm) is applied to the molded body U that is set and held on the cylindrical holding member 20 of the first support 12. ), The through hole S1 or the bottomed hole S2 can be formed while the piercing member 44 of the piercing rod 42 rotated in the step is inserted. If the piercing rod 42 is rotated in this manner, the piercing member 44 attached to the tip of the piercing rod 42 can easily enter the molded body U, and the long or small diameter through hole S1 or bottomed hole S2 is obtained. When drilling, it is possible to carry out drilling work without bending.
[0039]
Note that only one of the first support 12 and the perforating rod 42 may be configured to rotate, or both may be configured to rotate simultaneously. Further, if the first support 12 and the piercing rod 42 can be rotated in both directions, for example, the piercing operation is performed while rotating forward / reversely for every required time (for each required number of rotations). Thus, further efficiency and high accuracy can be expected when the through hole S1 or the bottomed hole S2 is formed.
[0040]
Furthermore, in the said Example, although the said 1st support body 12 and the 2nd support body 14 were arrange | positioned in a horizontal state and illustrated the horizontal operation | movement drilling machine 10 which moves to a horizontal direction mutually, it moved apart. The first support body 12 and the second support body 14 may be arranged in a vertical state so as to be a vertical operation type drilling machine 10 that moves in the vertical direction toward and away from each other. In the case of such a vertical operation type punch, the molded body U that is set and held in the cylindrical holding member 20 of the first support 12 is bent in a direction perpendicular to the longitudinal central axis by gravity. Inconvenience can be appropriately avoided.
[0041]
Furthermore, in the punching machine 10 of the embodiment, if the rod member 46 is detachably mounted on the second support 14, the punching member 44 and the heat insulating member 60 are attached to the rod member 46. Therefore, the rod member 46 having the through-hole S1 formed in the molded body U is removed from the second support 14 without being pulled out from the through-hole S1, and the hollow cylindrical body U1 is left as it is. It is also possible to install through. For this reason, in the case where the shaft member is configured to penetrate through a cylindrical roller body like the roller described above, the shaft member is assembled to the second support 14 as the rod member 46. If the above-described drilling operation is performed with the heat insulating member 60 and the punching member 44 assembled at the tip of the shaft member, the step of drilling the through hole S1 in the molded body U and the through hole S1 are performed. It is possible to simultaneously perform the mounting operation of the shaft member.
[0042]
Moreover, in the said Example, by setting the movement stroke of the 1st support body 12 so that the said perforation member 44 may protrude completely from the molded object U, it penetrates to this molded object U along the center axis line of the longitudinal direction. The case where the hole S1 is formed and the hollow cylindrical body U1 of FIG. 9B is formed is illustrated. However, as described above, the stroke amount of the first support 12 by the fluid pressure actuator 16 is set shorter than this, and the piercing member 44 protrudes from the molded body U when the proximity movement of the first support 12 is completed. If not set, a bottomed hole S2 having a required length along the central axis in the longitudinal direction is formed in the formed body U, and the bottomed hollow cylindrical body U2 illustrated in FIG. 9C is formed. It is possible. That is, in the drilling machine 10 of the embodiment, by adjusting the set stroke amount of the first support 12 by the fluid pressure actuator 16, in other words, the stroke amount when the first support 12 and the second support 14 are moved in proximity. Based on this setting, the through hole S1 or the bottomed hole S2 can be selectively drilled in the molded body U.
[0043]
Further, in the embodiment, the second support 14 is fixedly arranged and the first support 12 is movably arranged so that the first support 12 is attached to the second support 14. An example of a drilling machine in which both supports 12 and 14 can be moved closer to and away from each other by reciprocal movement is illustrated. However, on the contrary, the second support 14 is movably disposed and the first support 12 is fixedly disposed, and the second support 14 is fixed to the first support 12. By reciprocating, the through holes or the bottomed holes are suitably drilled in the molded body U set on the first support body 12 even if the both support bodies 12 and 14 can be moved closer to and away from each other. Can be established.
[0044]
In addition, in the said Example, the perforation suitable for shape | molding the through-hole S1 or the bottomed hole S2 along the center axis line of the longitudinal direction in the solid cylindrical-shaped molded object U illustrated to Fig.9 (a). Although the machine 10 has been illustrated, the shape of the molded body U to be perforated is not limited to this, and can be various outer shapes. Further, in the case of the molded body U having a different outer shape, the shapes of the cylindrical holding member 20 of the first support 12, the cylindrical guide member 36 of the second support 14, the induction coil 50, etc. Is changed.
[0045]
On the other hand, in the said Example, although the case where the through-hole S1 or the bottomed hole S2 was pierced in the molded object U made from urethane foam which carried out foam molding of polyurethane, according to the punching machine 10 of this Example, for example, The through-hole S1 or the bottomed hole S2 can be drilled in a so-called solid type molded body U that has been injection-molded. However, in the case of a solid-type molded body U, it is desirable to set the temperature of the perforated member 44 to a melting temperature higher than the softening temperature T, and to discharge the molten resin melted by the perforated member 44 May need to be performed. In such a case, for example, (1) a method of extending a groove along the longitudinal direction on the outer surface of the rod member 46 and sequentially circulating and discharging the molten resin using the groove, (2) the rod member Since 46 is a hollow body, a method of allowing molten resin to pass through the internal space of the rod member 46 and sequentially circulating and discharging it can be implemented. The molded body U can be formed with the through hole S1 or the bottomed hole S2 regardless of whether it is molded from a thermoplastic synthetic resin or molded from a thermosetting synthetic resin. is there.
[0046]
Further, when the molded body U is the solid type described above, the structure of the first support 12 can be changed. That is, since it is difficult for bending deformation or the like to occur in the molded body U, instead of the cylindrical holding member 20, a holding configuration is adopted in which only the end of the molded body U is gripped, and the molded body U is You may make it enter into the cylindrical guide member 36. FIG.
[0047]
【The invention's effect】
  As explained above, the drilling machine according to the present invention.And manufacturing method of roller with shaft using this punching machineAccording to the above, by using the induction heat generation principle, the perforated member disposed at the tip of the perforated rod is caused to generate dielectric heat at a temperature higher than the softening temperature of the molded body, and under this condition, the perforated member is pressed and brought into contact with the molded body. A hole or a bottomed hole is formed. For this reason, even if the molded body is formed of a relatively hard synthetic resin, the through hole or the bottomed hole can be drilled in a short time without bending, and the processing application range compared to a conventional drilling machine There is an advantage that can be expanded. In addition, since there is almost no wear of the perforated member when drilling a through hole or a bottomed hole in the molded body, it is not necessary to frequently perform replacement and maintenance work of the perforated member. There are effects such as reduction.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing an overall configuration of a drilling machine according to a preferred embodiment of the present invention.
FIG. 2 is an explanatory view showing a first support body and a second support body constituting the drilling machine of the embodiment illustrated in FIG. 1 and a molded body preformed into a solid cylindrical body in a perspective state. is there.
FIG. 3 is an explanatory view showing a first support body and a second support body constituting the drilling machine of the embodiment illustrated in FIG. 1 and a molded body preformed into a solid cylindrical body in a sectional state. is there.
FIG. 4 (a) moves the first support close to the second support, and sets the piercing rod of the piercing device provided on the second molded body to the cylindrical holding member provided on the first support. FIG. 5 is a plan sectional view showing a state in which a through-hole is formed in the molded body by penetrating the held molded body, and (b) is a side showing a state in which a through-hole is formed in the molded body It is sectional drawing.
FIG. 5 is an explanatory view showing a piercing rod and an induction coil constituting the piercing device in a cross-sectional state.
FIG. 6 is an explanatory view showing, over time, an initial stage of a drilling operation in which the first support is moved close to the second support, in which (a) shows the drilling member of the drilling rod in contact with the molded body. (B) shows a state where the perforated member starts to contact the side end surface of the molded body, and (c) shows a state where the perforated member pressed against the molded body enters the molded body. It shows the state that started.
FIG. 7 is an explanatory view showing a state in which the piercing member has penetrated the molded body by moving the first support body by a predetermined stroke amount.
FIG. 8 shows a state in which a hollow cylinder having a through-hole is formed along the central axis in the longitudinal direction by pulling the piercing rod from the molded body by moving the first support away from the second support. It is explanatory drawing.
9A is a perspective view of a molded body preformed into a solid cylindrical body, and FIG. 9B is a perspective view of the molded body illustrated in FIG. It is a perspective view of the hollow cylindrical body shape | molded by drilling a through-hole, (c) is a bottomed hole of required length along the central axis of the longitudinal direction in the molded object illustrated to (a). It is a perspective view of the bottomed hollow cylindrical body shape | molded by drilling.
[Explanation of symbols]
12 First support
14 Second support
40 Drilling device
42 Drilling rod
44 Perforated member
46 Rod member
48 Coating layer
50 induction coil
58 Coating layer
60 Thermal insulation member
S1 Through hole
S2 Bottomed hole
T softening temperature
U molded body

Claims (11)

To you the synthetic resin material forming feature (U), a through-hole (S1) or drilling machine for drilling a bottomed hole (S2),
A first support (12) capable of holding the molded body (U) as a set;
A punching device (40) is provided so as to be close to and away from the first support (12), and drills the through hole (S1) or the bottomed hole (S2) in the molded body (U). A second support (14),
The perforating device (40)
The magnets attached to the rod member (46) and the tip of the rod member (46) are arranged on the second support (14) so as to be aligned in the approaching / separating direction of the both supports (12, 14). Bei obtain piercing rod piercing member (44) to the body with the material (42),
It is installed at a position surrounding the perforated member (44) to allow the molded body (U) to pass through, and the perforated member (44) is induced to generate heat above the softening temperature (T) of the molded body (U). It consists of an induction coil (50),
The first support body (12) and the second support body on which the molded body (U) is set while the perforated member (44) is heated by induction heat and maintained at a temperature equal to or higher than the softening temperature (T). The through hole (S1) or the bottomed hole (S2) can be drilled by moving (14) close to each other and pressing the punch member (44) against the molded body (U). ,
The rod member (46) is removed from the second support (14) after the through hole (S1) or the bottomed hole (S2) is formed in the molded body (U), and the molded body (U ), Which can be mounted as it is . The drilling machine according to claim 1 , wherein the rod member (46) is formed of a non-magnetic material . The punching machine according to claim 1 or 2, wherein the punching member (44) is arranged so as to always exist in the magnetic flux generated by the induction coil (50) . The punching machine according to any one of claims 1 to 3, wherein a heat insulating member (60) is interposed between the punching member (44) and the rod member (46) . The first support (12) is a cylindrical holding member (20) composed of a first half (20A) and a second half (20B) that are separable in the longitudinal direction and can be assembled to each other by an assembly fixing means. ), The cylindrical shaped molded body (U) is set and held in the accommodating portion (22) defined internally in the cylindrical holding member (20),
The second support (14) is formed by the cylindrical holding member (20) when the through-hole (S1) or the bottomed hole (S2) is formed in the molded body (U) by the punching member (44). The drilling machine according to any one of claims 1 to 4, further comprising a cylindrical guide member (36) for guiding and holding the container . The punching machine according to any one of claims 1 to 5, wherein the molded body (U) is made of urethane foam . A method of manufacturing a roller with a shaft by drilling a through hole (S1) or a bottomed hole (S2) in a molded body (U) made of synthetic resin,
  The molded body (U) is set and held on the first support (12),
  A rod member (44) attached to the tip of a piercing member (44) made of a magnetic material provided on a second support (14) installed so as to be close to and away from the first support (12). 46) is aligned with the first support (12) in the approaching / separating direction of both supports (12, 14),
  An induction coil (50) installed at a position surrounding the piercing member (44) and allowing the molded body (U) to pass therethrough induces heat generation of the piercing member (44), thereby causing the piercing member (44) to Hold the molded body (U) at a temperature equal to or higher than the softening temperature (T),
  The first support body (12) and the second support body (14) on which the molded body (U) is set are moved close to each other, and the piercing member (44) is pressed into contact with the molded body (U). By drilling the through hole (S1) or the bottomed hole (S2),
  After forming the through hole (S1) or the bottomed hole (S2) in the molded body (U), the rod member (46) is removed from the second support body (14), and the molded body (U) I tried to put it on
A method of manufacturing a roller with a shaft, The method for manufacturing a roller with a shaft according to claim 7, wherein a heat insulating member (60) is interposed between the perforated member (44) and the rod member (46). The method for manufacturing a roller with a shaft according to claim 7 or 8, wherein the rod member (46) is formed of a non-magnetic material. The first support (12) is a cylindrical holding member (20) composed of a first half (20A) and a second half (20B) that are separable in the longitudinal direction and can be assembled to each other by an assembly fixing means. The molded body (U) is set and held in a housing part (22) defined inside the cylindrical holding member (20). Roller manufacturing method. The method for manufacturing a roller with a shaft according to any one of claims 7 to 10, wherein the perforating member (44) is arranged so as to always exist in a magnetic flux generated by the induction coil (50).

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