JP2007196538A - Hollow structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate variations in product precision by simplifying a structure, and to reduce weight by securing predetermined rigidity. <P>SOLUTION: A swing arm 2 for mounting a molded article as a hollow structure 1 comprises: a shell body 3 having a closed cross-section structure with no joint or mating surface; a reinforcing rib 4 which is elongated in the width direction and provided in a hollow part 3a in the shell body 3 in such a manner as to continue into the shell body 3; and a charging passage 7 for charging a negative-pressure supply tube 6 (operating-energy supply system) to an operation part such as a molded-article suction-holding part 5 which is connected to the shell body 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hollow structure, for example, a hollow structure suitable for a molded product take-out arm of a molded product take-out machine mounted on a resin molding machine.

  The molded product take-out arm of the molded product take-out machine mounted on the resin molding machine allows the molded product gripping part attached to the tip of the molding machine to move between the molding site of the resin molding machine and the release position outside the molding machine at high speed. Therefore, it is required to make it possible to shorten the time for taking out the molded product. For this reason, it is necessary to ensure a predetermined rigidity and achieve weight reduction. For this reason, conventionally, a non-ferrous metal extrusion mold material such as aluminum has been used as a material for the molded product take-out arm. According to this extruded mold material, a predetermined rigidity is secured by the shell body having a closed cross-section structure that does not have a seam and a mating surface, and the hollow portion is formed therein, thereby reducing the weight and reinforcing ribs. By forming, rigidity can be further increased.

  However, the formation of the reinforcing rib is limited to only a solid one extending in the longitudinal direction of the molded product take-out arm, and it is impossible to form the reinforcing rib extending in the width direction. Therefore, the ratio of the weight of the reinforcing rib to the weight of the unit length of the shell body of the closed cross-sectional structure having the same cross-sectional area is the structure in which the reinforcing rib extending in the width direction is formed at a predetermined interval in the longitudinal direction. May increase the weight of the molded product take-out arm unnecessarily. In addition, the operation part such as a molded product gripping part provided at the tip of the molded product take-off arm, a posture control device for controlling the posture of the molded product gripping part, a sensor for detecting the gripping state of the molded product by the molded product gripping part, In order to form a loading passage for loading a working energy supply system such as a fluid supply pipe or a conductive cable that supplies working energy, a mold equipment for extrusion or extraction for exclusive use of the molded product take-out arm is required. Become. Of course, it is possible to eliminate the need for a mold equipment for pushing or pulling out the molded product take-out arm by directly inserting the operating energy supply system into the hollow portion in the shell body having a closed cross-sectional structure. . However, when the operating energy supply system is directly inserted into the hollow portion, friction between the inner surface of the shell body and the operating energy supply system and friction between the operating energy supply systems occur in a complex manner, and this is repeated. The operating energy supply system will be damaged in a relatively short period of time. Therefore, the structure in which the operating energy supply system is directly inserted into the hollow portion in the shell body having the closed cross-sectional structure cannot be adopted.

  As described above, the front shape of the molded product removal arm that is suitable for shortening the molded product take-off time and reducing the load inertia at the molded product gripping position and the release position to improve the accuracy of the stop position A square arm is used. By bending the front shape into a roughly square shape, the arm can be swiveled without interfering with the tie bar, which has a guide function for accurately moving the movable mold of the resin molding machine to and from the fixed mold. Can be made. In order to make such a swivel arm using an extruded mold made of non-ferrous metal such as aluminum, not only a complicated process of bending a straight closed cross-section shell body into a square shape is necessary, but also a swivel arm product. There is a problem that the accuracy is likely to vary.

  On the other hand, it comprises a foamed resin core material having a tube built between the base end portion and the distal end portion, and a fiber reinforced resin body coated on the outer surface of the foamed resin core material. A swivel arm of a molded product take-out machine that can accommodate various cables connected to a section has been proposed (for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2005-161688.

  The swivel arm described in Patent Document 1 has a square shape that substantially matches the swivel arm by foamed resin such as foamed styrene resin or foamed urethane resin, and has a through hole extending from the base end to the tip. A core material made of foamed resin is formed, and a heat-resistant and flexible tube is inserted into the through-hole from the proximal end portion to the distal end portion of the core material. And on the outer surface of the core material made of foamed resin, a reinforcing fiber cloth containing a thermosetting resin impregnated with a thermosetting resin such as an epoxy resin in a reinforcing fiber cloth such as a carbon fiber cloth or a glass fiber cloth is laminated at a desired thickness. After being wound, the fiber-reinforced resin body is coated and formed by thermosetting the thermosetting resin while being set in a mold and pressurized and heated.

  According to the swivel arm described in Patent Document 1, it is possible to prevent a defective appearance due to a dent by ensuring a predetermined rigidity, and to smoothly carry out a mounting operation of a cable or the like, and to achieve a reduction in weight. . However, not only is the structure complicated, but also the complicated work of laminating and winding the thermosetting resin-containing reinforcing fiber cloth with a desired thickness is required, and the product accuracy of the swivel arm varies. There are easy difficulties.

  The present invention solves such a problem, and the object of the present invention is to simplify the structure so that there is no variation in product accuracy, and to ensure a predetermined rigidity and achieve weight reduction. An object of the present invention is to provide a hollow structure.

  A hollow structure according to the present invention includes a shell main body having a closed cross-sectional structure having no seam and a mating surface, and a reinforcing rib extending continuously in the hollow direction inside the shell main body and extending at least in the width direction. And a charging passage for charging an operating energy supply system to the operating part connected to the shell body.

  According to this, a predetermined rigidity can be ensured by the shell body having a closed cross-sectional structure, and weight reduction can be achieved by providing the hollow portion inside the shell body. Further, the shell main body can be reinforced by the reinforcing rib extending at least in the width direction, and the rigidity can be further increased. Furthermore, the shell body having a simple cross-sectional structure in which the reinforcing rib and the charging passage are provided in the hollow portion can be formed with high accuracy by, for example, a lamination molding method.

  In the hollow structure of the present invention, the shell body having the closed cross-sectional structure is provided with an inlet of an operating energy supply system that communicates with the charging passage and an outlet of the operating energy supply system. According to this, the operating energy supply system can be easily inserted into the charging passage and protected by inserting the operating energy supply system to the operating portion connected to the shell body from the inlet to the outlet. . Accordingly, friction between the inner surface of the shell body having a closed cross-sectional structure and the operating energy supply system and friction between the operating energy supply systems can be avoided, the life of the operating energy supply system can be extended, and durability can be improved.

  In the hollow structure of the present invention, the operating energy supply system includes a conductive cable for power supply and piping for fluid supply. According to this, the operation part can be constituted by an electric motor or a hydraulic motor, a hydraulic motor, an air motor or an air cylinder, a suction cup type or a pinching type gripping part.

  The hollow structure of the present invention is preferably a molded product take-out arm equipped in a molded product take-out machine. According to this, it is possible to secure a predetermined rigidity, achieve weight reduction, and provide a molded product take-out arm with a simple structure and high accuracy.

  According to the present invention, a predetermined rigidity can be ensured by the shell body having a closed cross-sectional structure, and weight reduction can be achieved by providing the hollow portion. Further, the shell main body can be reinforced by the reinforcing rib extending at least in the width direction, and the rigidity can be further increased. Furthermore, the shell body having a simple closed cross-sectional structure in which the reinforcing rib and the charging passage are provided in the hollow portion can be easily molded with high accuracy without variation by, for example, a lamination molding method.

Hereinafter, an embodiment of a hollow structure according to the present invention will be described with reference to the drawings.
1 is an overall front view showing an embodiment of a hollow structure according to the present invention, FIG. 2 is an enlarged left side view of FIG. 1, FIG. 3 is an enlarged sectional view taken along line AA of FIG. 1 is an enlarged cross-sectional view taken along line BB in FIG. 1, FIG. 5 is a CC enlarged arrow view of FIG. 1, and FIG. 6 is a DD enlarged arrow view of FIG.

  In these drawings, the hollow structure 1 is composed of a swivel arm 2 for taking out a molded product equipped in a molded product take-out machine, and has a closed cross-sectional structure having no seam and a mating surface, and the front shape is substantially letter-shaped. A shell main body 3, two reinforcing ribs 4 extending in the width direction provided in a hollow portion 3 a inside the shell main body 3, and one actuating portion provided at the tip of the shell main body 3 In addition to the first charging passage 7 in which a negative pressure supply tube 6 for supplying a negative pressure to the molded product suction gripping portion 5 that functions as the first charging passage 7 is inserted, When a sandwich-type molded product gripping portion (not shown) that functions as an operating portion is provided at the tip of the shell body 3, a positive pressure supply tube (not shown) that supplies positive pressure to the molded product gripping portion is provided. Second charging passage 8 to be charged and shell book 3 is provided with a posture control device (not shown) that functions as an operating part, a molded product gripping state detection sensor (not shown), etc. provided at the tip of the conductive cable (not shown) And a third charging passage 9 in which is omitted).

  The first, second, and third charging passages 7, 8, and 9 are ribs 7a, 8a, It is provided in the hollow portion 3a so as to be continuous with the shell main body 3 through 9a, and functions as a reinforcing vertical rib for reducing weight. The first, second, and third charging passages 7, 8, and 9 include inlets 7b, 8b, and 9b that open on the base side of the shell body 3, and outlets 7c that open on the distal end side of the shell body 3. 8c and 9c are provided. For this reason, the negative pressure supply tube 6 can be inserted into the first charging passage 7 by being inserted from the inlet 7b of the first charging passage 7 to the outlet 7c, and the tip portion thereof can be inserted into the molded product suction gripping portion 5. The first operating energy supply system can be configured by connecting. Further, the positive pressure supply tube can be inserted into the second charging passage 8 by being inserted from the inlet 8b of the second charging passage 8 to the outlet 8c, and the tip end portion of the positive pressure supply tube can be inserted into the sandwich-type molded product gripping portion. A second operating energy supply system can be configured by connecting to the conductive cable, and the conductive cable can be inserted into the third charging passage 9 by being inserted from the inlet 9b to the outlet 9c of the third charging passage 9, A third operating energy supply system can be configured by connecting the tip portion to the posture control device or a gripping state detection sensor of the molded product.

  According to the said structure, predetermined | prescribed rigidity can be ensured with the shell main body 3 of a closed cross-section structure, and weight reduction can be achieved by providing the hollow part 3a in the inside of the shell main body 3. FIG. Further, the shell body 3 can be reinforced by the reinforcing ribs 4 extending in the width direction of the shell body 3 and the H-shaped ribs 7a, 8a, 9a extending along the shell body 3, and the rigidity thereof can be further enhanced. Furthermore, the negative pressure supply tube 6 can be separately charged into the first charging passage 7, the positive pressure supply tube can be separately charged into the second charging passage 8, and the conductive cable can be separately charged into the third charging passage 9. Avoiding friction between the inner surface of the main body 3 and the negative pressure supply tube 6, the positive pressure supply tube and the conductive cable and friction between the negative pressure supply tube 6, the positive pressure supply tube and the conductive cable, and extending the life of these operating energy supply systems. Can be achieved and durability can be improved.

  The swivel arm 2 that is the hollow structure 1 having the above-described configuration can be formed by, for example, integral molding by an optical modeling method in which a three-dimensional structure is formed using a photosensitive resin.

  An optical modeling method, which is an example of a layered modeling method, roughly includes a modeling process, an editing process, and a modeling process. As an example of stereolithography, first, three-dimensional data of the hollow structure 1 designed in a three-dimensional shape is created by a three-dimensional CAD system (modeling process).

  Next, the three-dimensional data is cut in a horizontal direction at equal intervals in the height direction by a computer to create a cross-section data group of a circular cut (editing step).

  On the other hand, the table surface is set at a position slightly below the liquid surface of the tank filled with the liquid photo-curing resin, and the laser beam is liquidated while lowering the table surface sequentially according to the cross-section data group of the ring slice. The revolving arm 2 that is the hollow structure 1 can be formed by repeating the operation of scanning the surface (modeling process).

  Polyester acrylate, polyurethane acrylate, novolac type epoxy resin, bisphenol type epoxy resin, etc. are used as the photocurable resin, and acetophenone type, benzoyl type, benzyl ketal type or Kent type photoinitiator is added to these resins Is done. As the laser beam, an ultraviolet laser such as a He—Cd laser, an argon laser or a krypton laser, an ultraviolet lamp such as a xenon lamp or a mercury lamp, or the like is used.

  In addition, the swivel arm 2 that is the hollow structure 1 having the above-described structure is a laser sintering method in which a three-dimensional structure is formed while further sintering (fusion) the thermoplastic powder material with the heat of a carbon dioxide gas laser. It can also be molded by integral molding.

  The process for the laser sintering method, which is an example of the laminated molding method, is roughly composed of a modeling process, an editing process, and a modeling process, as in the optical molding process. As an example of stereolithography, first, three-dimensional data of the hollow structure 1 designed in a three-dimensional shape is created by a three-dimensional CAD system (modeling process).

  Next, the three-dimensional data is cut in a horizontal direction at equal intervals in the height direction by a computer to create a cross-section data group of a circular cut (editing step).

  On the other hand, it has a cross-sectional shape that enables uniform lamination, and the recoater moves from the material tank on the top or side to the platform for each layer so as to spread a layer of thermoplastic powder material and at the same time form a uniform plane After recoding, the laser fills and sinters the shape cross section for one layer. When the sintering for one layer is completed, the platform is further lowered (the platform is lowered), and recoding is performed again (molding process).

  As the thermoplastic powder material, nylon, glass-filled nylon, polystyrene or the like is used. Further, metal materials such as bronze alloys and iron alloys other than resin materials are also suitable.

It is a whole front view showing one embodiment of the hollow structure concerning the present invention. FIG. 2 is an enlarged left side view of FIG. 1. It is an expanded sectional view which follows the AA line of FIG. It is an expanded sectional view which follows the BB line of FIG. It is CC expanded arrow line view of FIG. FIG. 2 is a DD enlarged arrow view of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow structure 2 Revolving arm 3 Shell body of closed cross-section structure 3a Hollow part 4 Reinforcing rib extending in the width direction 5 Molded product adsorption gripping part (actuation part)
6 Negative pressure supply tube (fluid supply tube, operating energy supply system)
7 First charging passage (charging passage)
7a Inlet 7b Outlet 8 Second charging passage (charging passage)
8a Inlet 8b Outlet 9 Third charging path (charging path)
9a entrance 9b exit

Claims (4)

  A shell body having a closed cross-section structure having no seam and a mating surface, and at least a reinforcing rib provided in a hollow portion inside the shell body and extending in the width direction continuously to the shell body, and an operation coupled to the shell body A hollow structure comprising a charging passage for charging an operating energy supply system to a section. The hollow structure according to claim 1,
A hollow structure characterized in that the shell body having the closed cross-sectional structure is provided with an inlet of an operating energy supply system leading to the charging passage and an outlet of the operating energy supply system. In the hollow structure according to claim 1 or 2,
A hollow structure characterized in that the operating energy supply system comprises a conductive cable for power supply and piping for fluid supply. In the hollow structure according to claim 1, claim 2, or claim 3,
A hollow structure characterized in that the hollow structure is a molded product take-out arm mounted on a molded product take-out machine.

Images