JP2016037002A - Burr removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a burr while suppressing deformation, generation of opening of a weld line and the like in a resin molded article.SOLUTION: A burr removal device 1 can be inserted into an internal passage of a resin molded article and comprises a nozzle part 31 formed with an annular injection port on a tip part thereof and a hot air supply source 32 supplying hot air to the nozzle part 31. The burr removal device 1 removes a burr by moving the nozzle part 31 so that the annular injection port of the nozzle part 31 is arranged to face the burr, and locally injecting the hot air, supplied from the hot air supply source 32, to the burr formed in the internal passage of the resin molded article from the injection port of the nozzle part 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a burr removing device for removing a burr generated in a molded resin product after molding.

  Conventionally, resin products are produced by injection molding using a mold. In injection molding, a molten resin material injected from a nozzle of an injection molding machine flows into a space (cavity) for forming a resin product main body through a mold spool and runner, and the resin product main body, spool and A resin molded product including a runner is molded. In the case of a resin molded product having an internal passage, the core is disposed in a portion corresponding to the space that forms the internal passage in the mold, and the molten resin material is caused to flow into the space between the core and the cavity. The possessed resin molded product is molded.

  When molding a resin molded product having an internal passage, the core is often divided in the internal passage due to the structure of the mold. In particular, when molding a resin molded product having a branched internal passage, the core of the main pipe part and the branch pipe part cannot be removed from the product after molding because it is made integrally. Sometimes they are combined in a mold using a hydraulic cylinder or an angular mechanism, and are divided again when the mold is opened and the molded resin product is removed from the mold. For this reason, a burr | flash generate | occur | produces in the surrounding wall of the internal channel | path of a resin molded product along the mating surface of the core of a main pipe part and a branch pipe part.

  When such a burr in the internal passage of the resin molded product affects the quality, it is necessary to remove the burr in a post-molding process. As a method of removing the burrs, there is a method of cutting or polishing the burrs by cutting or the like by machine or manually. Further, as described in Patent Document 1, a method of melting and removing burrs by inserting a metal body into a hole and applying primary heat to the metal body, or as described in Patent Document 2 In addition, a method has been proposed in which burrs formed on the mating surfaces of the core are removed by baking with a gas burner.

JP 2005-262617 A Japanese Utility Model Publication No. 58-62614

  In the injection molding of a resin molded product having an internal passage, it is necessary to arrange the core in the mold, so the flow of the molten resin material flows around the core in the mold and joins and fuses in a thin line shape Weld lines may occur. The weld line may cause a decrease in strength and sealability due to poor fusing. Especially when the resin molded product is a piping material, the strength and sealability become a problem. It is also important not to adversely affect the line.

  The removal of burrs by manual or mechanical cutting or polishing has little effect on the weld line, but may cause secondary burrs. Furthermore, in the case of manual work, there is a problem that it takes time to remove safety and burrs. In the case of using a machine, it is necessary to move the cutting tool or the polishing tool along a predetermined trajectory. If the resin molded product is distorted or warped, the burrs may not be completely removed. On the other hand, the methods described in Patent Document 1 and Patent Document 2 can remove burrs without causing the above problems. However, in the method described in Patent Document 1, since the metal body is brought into contact with the inner wall of the branch pipe part for removing burrs, the branch pipe part may be deformed or the weld line may be opened. Also, in the method described in Patent Document 2, since flame is used for removing burrs, the heat of the flame can be transmitted to other parts to cause deformation and melting, or the opening of the weld line can be generated. There is a problem that the flame is difficult to control.

  In order to solve the above-described problems of the prior art, an object of the present invention is to remove burrs while suppressing the occurrence of deformation and the opening of a weld line in a resin molded product.

In view of the above-mentioned object, the present invention is a burr removing device for removing a burr generated on a peripheral wall of an internal passage of a resin molded product,
A nozzle part that can be inserted into the internal passage of the resin molded product and has an annular injection port formed at a tip part thereof, and a hot air supply source that supplies hot air to the nozzle part, the annular injection port being a burr The nozzle portion is moved so as to be opposed to the hot air supplied from the hot air supply source locally from the injection port of the nozzle portion toward the burr generated in the internal passage of the resin molded product. A first feature is to provide a burr removing device that removes the burr by spraying.

  In the molding of a resin molded product having an internal passage, an internal passage is often formed by arranging a plurality of cores in a mold. In this case, an annular burr is formed along the outer edge of the mating surface of different cores. Easy to form. In the above burr removing device, an annular injection port is formed at the tip of the nozzle portion, and by arranging the injection port so as to face the burr, hot air is locally injected over the entire burr only in the vicinity of the burr. be able to.

  In the above-described burr removing device, the injection port of the nozzle part has a shape similar to the shape of the outer edge of the mating surface of different cores arranged in the mold to form the internal passage of the resin molded product. The second feature is that it extends. This makes it possible to efficiently apply hot air to the burr.

  The nozzle portion extends along an axis and has a main body tube having a front end opening and a rear end opening at both ends in the axial direction, a support shaft disposed in the main body tube, and the main body tube outside the main body tube. A distal end member supported at the distal end of the support shaft so as to be spaced apart from the distal end opening of the main body tube, hot air is supplied from the hot air supply source to the rear end opening of the main body tube, A third feature is that a gap between a peripheral edge of the tip opening and the tip member forms an injection port for injecting hot air. Further, in this case, the fourth feature is that the support shaft is supported by the main body tube so as to be movable in the direction of the axis. As a result, it is possible to adjust the gap serving as the injection port, and it is possible to remove the burrs efficiently by applying hot air only around the burrs.

  A fifth feature is that the nozzle portion further includes a baffle plate for blocking a part of the hot air ejected from the ejection port of the nozzle portion. Thus, when the weld line extends adjacent to the burr, it is possible to prevent the weld line from being opened by the hot air hitting the weld line by the baffle plate.

  A sixth feature is that an outer peripheral portion of the main body pipe of the nozzle portion is covered with a heat insulating layer. Thereby, it is possible to suppress the influence of the heat of the hot air passing through the nozzle portion on the portions other than the burrs, and to suppress the deformation of the resin molded product and the occurrence of the weld line opening.

  The burr removing device further includes a product take-out device for gripping and taking out the molded resin molded product from a mold for molding the resin molded product, and the nozzle portion includes the product take-out device. According to a seventh aspect of the present invention, the resin molded product is held in the inner passage and is inserted into the internal passage. This makes it possible to automatically remove burrs when taking out the resin molded product from the mold, eliminating the need for a separate process for removing burrs, reducing production time and line space. Can be reduced.

  According to the present invention, the hot air can be locally sprayed over the entire burr only in the vicinity of the burr, so that the burr is suppressed by the hot air while suppressing the deformation of parts other than the burr and the occurrence of the opening of the weld line. It can be removed.

It is a perspective view which shows the whole structure of the burr | flash removal apparatus which concerns on this invention. It is a longitudinal direction cross section of the nozzle part of 1st Embodiment of the burr | flash removal apparatus which concerns on this invention. It is sectional drawing of the T-shaped pipe joint as an example of the resin molded product which can apply the burr | flash removal apparatus which concerns on this invention, (a) is a state before inserting a nozzle part, (b) is a nozzle part. The state after insertion is shown. It is sectional drawing along line IV-IV of the T-shaped pipe joint shown by FIG. 3, (a) is the state before inserting a nozzle part, (b) is the state after inserting a nozzle part. Show. It is sectional drawing which shows the other example of the pipe joint which can apply the burr | flash removal apparatus which concerns on this invention, (a) is an elbow, (b) is a socket, (c) has shown a different diameter socket. It is a longitudinal cross-sectional view of the nozzle part of 2nd Embodiment of the burr | flash removal apparatus which concerns on this invention. It is a fragmentary sectional view which shows the resin molded product which the weld line generate | occur | produced in the vicinity of the burr | flash. It is sectional drawing along line VIII-line VIII of the resin molded product shown by FIG. It is sectional drawing which shows the state which inserted the nozzle part in the resin molded product shown by FIG.

Hereinafter, embodiments of a deburring device according to the present invention will be described with reference to the drawings, but it goes without saying that the present invention is not limited to these embodiments.
Initially, the whole structure of the burr | flash removal apparatus 1 is demonstrated with reference to FIG. The burr removing device 1 is a device for removing burrs generated on the inner peripheral wall of the internal passage of a resin molded product molded by a mold. Examples of the resin molded product having an internal passage include a pipe joint and a valve body used for a pipe for flowing a fluid in plant equipment and devices, water and sewage systems, agricultural water, hot water supply equipment, and the like. The pipe joint is used for pipe connection, branching, changing the direction of the flow path, changing the size of the flow path, and the like. The valve main body is used as a main body of the valve, and the valve is used for opening and closing the flow path and adjusting the flow rate.

  The resin material used for the resin molded product is appropriately selected according to the purpose of the product. For example, as molding materials used for pipe joints and valve bodies, polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), chlorinated polyvinyl chloride (PVC-C), polystyrene (PS), polycarbonate (PC), acrylonitrile butadiene styrene resin (ABS resin), polyvinylidene fluoride (PVDF), polyphenylene oxide (PPO), polyphenylene ether (PPE), polyphenylene sulfide (PPS), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer ( PFA) can be used. Polyvinyl chloride (PVC) also includes hard polyvinyl chloride and hard impact polyvinyl chloride. Moreover, what inserted the metal into resin is also contained in the resin molded product.

Referring to FIG. 1, the burr removing device 1 includes a product removing device 2 and a burr removing mechanism 3.
The product take-out device 2 grips a resin molded product molded by a mold (not shown) such as an injection molding machine and removes it from the mold. The resin molded product has an internal passage. The resin molded product immediately after molding is generally in a state in which a spool and a runner are connected to a product main body portion that is a resin product via a gate. The product body can be a joint 4 as shown in FIGS. 3 and 5 or a valve body 5 as shown in FIG. The spool is a passage of the molten resin material from the portion in contact with the nozzle of the injection molding machine to the runner, and has a circular cross section. The runner is an intermediate passage from the molten resin material to the gate and the cross section thereof has a circular shape, a trapezoidal shape, or a semicircular shape. In particular, the arrangement of the cavity and the runner is important in a multi-cavity mold, and the molten resin material must be designed to flow into the cavity simultaneously and evenly. The gate is an inlet through which the molten resin material flows into the cavity from the runner, and various structures are selected from the shape, appearance, quality, and the like of the molded product.

  The product take-out device 2 has a chuck 21 supported by a chuck support portion 22. The chuck 21 can grip a resin molded product including a spool, a runner, and a product main body. Further, the chuck 21 is configured to be able to expand and contract the gripping range so as to be compatible with resin molded products of various sizes. The chuck support portion 22 can be moved in a vertical direction and a horizontal direction by a traveling mechanism (not shown), and has a rotation unit that can be turned inside, so that the chuck 21 can be turned in various postures. ing. The resin molded product is taken out from the mold and moved to another place by moving the chuck support portion 22 by the travel mechanism in a state where at least the runner and the product main body portion of the resin molded product are held by the chuck 21.

  The burr removing mechanism 3 functions to remove burrs generated on the inner peripheral wall of the internal passage of the resin molded product taken out from the mold by the product take-out device 2, and the nozzle portion 31 attached to the mounting base 33. And a hot air supply source 32. If necessary, a moving device (not shown) may be provided on the mounting base 33 so that the nozzle portion 31 can be moved. The configuration of the moving device is not limited, and an appropriate mechanism can be used as long as the nozzle unit 31 can be moved. For example, a ball screw mechanism driven by an electric actuator, a belt driving mechanism or a chain driving mechanism driven by an electric actuator, an air cylinder, a hydraulic cylinder, or the like can be used as the moving device.

  The nozzle portion 31 is formed to have an outer diameter smaller than the inner wall of the internal passage of the resin molded product so that it can be inserted into the internal passage of the resin molded product to remove burrs. The hot air supply source 32 is connected to the nozzle unit 31 and is configured to generate hot air and supply it to the nozzle unit 31. An annular injection port is provided at the tip of the nozzle unit 31, and hot air supplied from the hot air supply source 32 to the nozzle unit 31 is injected from the injection port and generated on the inner wall of the internal passage of the resin molded product. Remove burr by hitting it.

  Any device can be used as the hot air supply source 32 as long as hot air can be generated and supplied to the nozzle unit 31. In one embodiment, an apparatus including a heating unit and a blower unit is used as the hot air supply source 32, and hot air is generated and supplied by heating the air supplied from the blower unit by the heating unit. it can. As the blower, a compressor or a blower fan that can generate compressed air can be used. Further, the heating unit can have any structure as long as it can be heated to a desired temperature. For example, a heating unit may be configured to incorporate a heating wire or an electric heating element that generates heat when energized and a temperature sensor, and the temperature of the heated air may be measured by the temperature sensor so that the temperature of the air can be controlled. . It is preferable that the temperature of the hot air jetted from the jet port of the nozzle portion 31 is controlled to be 40 ° C. or higher and the melting point of the resin material of the resin molded product + 20 ° C. or lower. If it is 40 ° C or higher, thin burrs can be blown off by wind pressure, and if it is the melting point of the resin material of the resin molded product + 20 ° C or lower, the burrs are melted while suppressing the occurrence of thermal deformation in parts other than the burrs. Can be removed. In particular, if the temperature is 50 ° C. or higher, the root portion of the burr is softened by heat, and the burr can be removed without leaving a trace by applying wind pressure. If the removal time is short, the weld line can be prevented from opening.

  In order to remove unnecessary parts such as spools and runners from the product body by cutting with a gate, a gate cutting device (not shown) is provided as a part of the deburring device 1 or as another device. May be.

  Next, the configuration of the nozzle unit 31 will be described in more detail with reference to the nozzle unit 31 of the first embodiment shown in FIG. The nozzle portion 31 includes a main body tube 311 extending along the axis, a support shaft 312 disposed in the main body tube 311, and a tip member 313 supported at the tip of the support shaft 312. The main body tube 311, the support shaft 311, and the tip member 313 can be formed from an appropriate material as long as the main tube 311, the support shaft 311 and the tip member 313 are not deformed by the heat of hot air.

  The main body tube 311 has a front end opening 314 and a rear end opening 315 at both ends in the axial direction. A hot air supply source 32 is connected to the rear end opening 315, and the hot air supplied from the hot air supply source 32 is configured to be ejected from the front end opening 315. The support shaft 312 is supported by the main body tube 311 so as to extend into the main body tube 311 along the axis of the main body tube 311. The distal end member 313 is attached to the distal end of the support shaft 312 so as to be spaced from the distal end opening 314 of the main body tube 311 outside the main body tube 311, and the peripheral edge of the distal end opening 314 of the main body tube 311 and the distal end member A gap formed between the main body tube side surface 313 forms an injection port 317. In addition, the outer dimension of the radial direction of the main body pipe | tube 311 and the front-end | tip member 313 is determined so that it can insert in the narrowest part of the internal channel | path of a resin molded product.

  The injection port 317 preferably extends so as to be similar to the shape of the outer edge of the mating surface of different cores arranged in the mold in order to form the internal passage of the resin molded product. In this case, for example, the peripheral edge of the distal end opening 314 of the main body tube 311 and the shape of the portion of the distal end member 313 facing this may be formed so as to have a shape similar to the shape of the outer edge of the mating surface of the core. If the injection port 317 extending so as to be similar to the shape of the outer edge of the core mating surface is formed, the hot air is locally and simultaneously sprayed in the vicinity of the entire burr formed on the outer edge of the core mating surface. As a result, the burrs can be efficiently removed and the influence of hot air on the portions other than the burrs can be suppressed to reduce the occurrence of deformation and the opening of the weld line.

  Preferably, the support shaft 312 has a threaded portion formed on at least a part of the outer peripheral surface thereof, and is screwed into a nut portion 316 fixed to the main body tube 311 to rotate the support shaft 312 around the axis. The tube 311 can be moved in the axial direction. If the support shaft 312 is screwed to the nut portion 316 of the main body tube 311, the support shaft 312 is rotated around the axis line to rotate the axial width of the injection port 317, that is, the peripheral edge of the tip opening 314 of the main body tube 311 It is possible to adjust the distance in the axial direction between the distal end member 313 and the side surface of the main body tube. The width of the injection port 317 in the axial direction is appropriately adjusted within a range where burrs can be removed. Note that the tip member 313 is rotatably supported with respect to the support shaft 312 so that the posture of the tip member 313 can be arbitrarily set regardless of the width of the ejection port 317, and the support shaft 312 is adjusted after the width of the ejection port 317 is adjusted. It is more preferable that it is locked so as not to rotate. For example, the tip member 313 may be fixed to the support shaft 312 by screwing a bolt penetrating a bolt hole provided in the tip member 313 into a screw hole provided at the tip of the support shaft 312. A male screw portion provided at the tip of the support member may be passed through a bolt hole provided in the tip member 313 and fixed to the tip of the support shaft 312 with a nut. Further, when it is not necessary to make the tip member 313 rotatable with respect to the support shaft 312, the tip member 313 and the support shaft 312 may be manufactured integrally.

  Further, the outer periphery of the main pipe portion 311 of the nozzle portion 31 may be covered with a heat insulating layer 318. By covering the main pipe part 311 with the heat insulating layer 318, the heat of the hot air supplied to the nozzle part 31 is transmitted through the main pipe part 311 to a part other than the burr on the inner peripheral wall of the internal passage of the resin molded product, It is possible to prevent the opening of the weld line from occurring. Moreover, since the heat of hot air is not released to the outside, the effect of suppressing energy loss is also achieved. In the above description, the main body pipe portion 311 and the heat insulating layer 318 are described as separate members. However, the main pipe portion 311 and the heat insulating layer 318 are integrally formed from the same heat insulating material, and the main pipe portion 311 itself. It is also possible to provide a heat insulating function.

  Note that the heat insulating layer 318 can be formed using an appropriate material as long as it has sufficient heat resistance to withstand hot air and has a heat insulating effect. For example, thermoplastic resins such as polyvinylidene fluoride (PVDF), polyphenylene oxide (PPO), polyphenylene ether (PPE), polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), phenol resin, epoxy resin, diallyl phthalate resin Thermosetting resins such as urea resin and melamine resin can be used as a material for forming the heat insulating layer 318.

  Next, referring to FIG. 3 and FIG. 4, an internal passage of the resin molded product using the burr removing device 1 as an example of a resin molded product when producing the pipe joint 4 (specifically, a T-shaped pipe joint). The procedure for removing the burrs generated in step 1 will be described. In FIGS. 3 and 4, the spool, runner, and gate of the resin molded product are omitted for simplicity of explanation.

  The burr is generated when molten resin enters a gap between outer edges of mating surfaces of different cores arranged in the mold at the time of molding, and the position and direction in which the burr is generated are different in the mold. Depends on the core matching method. For example, a burr | flash generate | occur | produces in a different direction with the case where it butt | matches by planes, and the case where it butt | matches by an inlay structure.

  As shown in FIG. 3A, the T-shaped pipe joint 4 exemplified as a resin molded product includes a main pipe portion 41 and a branch pipe portion 42 extending perpendicularly to the main pipe portion 41. In addition, the inner diameter of the main pipe portion is small at the connecting portion between the main pipe portion 41 and the branch pipe portion 42. In the case of such a shape, considering the removal of the core after molding, a left core for forming the left half of the main pipe part 41, a right core for forming the right half of the main pipe part 41, Three cores comprising a lower core for forming the branch pipe part 42 are used, the left core and the right core are butted at the center of the main pipe part, and the left core and the right core that are butted from the bottom to the bottom core Are then injection molded. As a result, as shown by the broken lines in FIGS. 3A and 4A, burrs 431 and 432 (hereinafter collectively referred to as burrs 43) along the outer edges of the mating surfaces of the respective cores. Will occur).

  In the deburring process, first, a resin molded product having an internal passage formed by injecting a molten resin material between a cavity and a core by placing a plurality of cores in a mold in abutment with each other. After the curing, the mold is opened to remove the core, and the product is picked up by the product take-out device 2 and the resin molded product is taken out from the mold.

  In order to remove burrs, the resin molded product is moved toward the burr removal mechanism 3 while being gripped by the product take-out device 2, and then a moving device provided on the product take-out device 2 and the mounting base 33 of the burr removal mechanism 3. The nozzle part 31 of the burr removing mechanism 3 is inserted into the internal passage of the resin molded product by relatively moving the resin molded product and the nozzle part 31 using one or both of them (not shown). The resin molded product and the nozzle portion 31 are positioned so that the injection port 317 extends opposite to the burr generated on the inner peripheral wall of the internal passage. The positioning of the nozzle portion 31 is performed such that hot air ejected from the ejection port 317 is ejected in the vicinity of the entire burr. Furthermore, you may adjust the width | variety of the axial direction of the injection outlet 317 by rotating the support shaft 312 with respect to the main body pipe | tube 311 of the nozzle part 31 as needed. When the ejection port 317 is positioned so as to face the burr, hot air is ejected from the ejection port 317 toward the burr and blown off or melted to remove the burr.

  The case where the burr 431 of the T-shaped pipe joint 4 is removed will be described in more detail as an example. The product take-out device 2 is gripped by the chuck 21 so that the branch pipe part 42 faces the nozzle part 31 of the burr removal mechanism 3. After changing the orientation of the T-shaped pipe joint 4, the T-shaped pipe joint 4 is moved so that the nozzle portion 31 is inserted into the branch pipe portion 42, as shown in FIGS. 3B and 4B. As described above, the injection port 317 of the nozzle portion 31 is positioned and stopped so as to extend along the burr 431 while facing the burr 431. Positioning may be performed using the end face of the main pipe part 41 or the branch pipe part 42 of the T-shaped pipe joint 4 so that the injection port 317 of the nozzle part 31 is surely opposed to the burr 431. When the ejection port 317 is positioned so as to face the burr 431, the hot air supplied from the hot air supply source 32 is ejected from the ejection port 317 toward the burr 431 to remove the burr. When removing the burr 432, similarly, the nozzle part 31 is inserted into the main pipe part 41 from the opening of the main pipe part 41, and the injection port 317 of the nozzle part 31 is positioned at a position facing the burr 432. The burr 432 may be removed by spraying hot air from the injection port 317 toward the burr 432. When the size and shape of the burr 431 and the burr 432 are different, it is preferable to provide a dedicated burr removal mechanism 3 for each.

  The injection port 317 is disposed so as to extend along the burr 43 so as to face the burr 43, and the hot air injected from the injection port 317 is locally injected in the vicinity of the whole burr 43. While the hot air is simultaneously applied and the burrs 43 are efficiently removed, the place where the hot air hits is limited to the vicinity of the burrs 43, so that the influence of the hot air on other parts of the T-shaped joint is suppressed, and deformation And the occurrence of opening of the weld line can be reduced. In addition, when the outer periphery of the main body tube 311 of the nozzle portion 31 is covered with the heat insulating layer 318, heat transfer to the resin molded product through the main body tube 311 of the nozzle portion 31 is also suppressed. The occurrence of opening can be further reduced. Furthermore, since the width of the injection port 317 in the axial direction of the main body tube 311 can be adjusted, the area where the hot air hits is adjusted in accordance with the shape and size of the burr 43 to reliably remove the burr and It is possible to minimize the effect of the resin molded product.

  When the burrs 43 in the internal passage of the T-shaped pipe joint 4 are removed, the T-shaped pipe joint 4 is pulled out from the nozzle portion 31 of the burr removing mechanism 3 by the product take-out device 2 and moved to a predetermined location, After the gate of the resin molded product is cut and the spool and runner are removed, it is sent to the next step. Here, the spool and the runner are removed after removing the burrs, but the spool and the runner may be removed before removing the burrs.

  By arranging a burr removing device 1 adjacent to a mold such as an existing injection molding machine or additionally providing a burr removing mechanism, a resin molded product is formed from the mold using the product take-out device 2 in the molding process. It is possible to remove burrs in the middle of the operation for taking out the material, and there is no need to provide another post-process for removing burrs. Therefore, production throughput is improved and production time can be shortened.

  The procedure for removing the burr 43 using the burr removing device 1 has been described above using the T-shaped pipe joint 4 as an example of a resin molded product. However, the application of the burr removing device 1 is not limited to the T-shaped pipe joint. However, it can be applied to any resin molded product in which burrs are generated in the internal passage. For example, the deburring device 1 includes an elbow as shown in FIG. 5 (a), a socket as shown in FIG. 5 (b), and a diameter difference as shown in FIG. 5 (c). Two-way pipe joint 4 without a branch pipe portion 42 such as a socket, a spigot type pipe joint, a rubber ring receptacle type pipe joint, a one-touch joint, an electrofusion type pipe joint, and combinations thereof (for example, one side is a socket type The opposite side can be applied to spigot type pipe joints, etc.), valve bodies, valve parts, etc. The type of valve of the valve body is not limited. For example, the burr removing device 1 can be applied to a valve body such as a ball valve, a butterfly valve, a gate valve, a diaphragm valve, a stop valve, or a switching check valve. 3 to 5 illustrate a pipe joint 4 in which the shape of the main pipe portion 41 is not uniform in the axial direction because a plurality of cores must be used and burrs 43 are easily generated in the internal passage. However, the burr removing device 1 can be applied to the pipe joint 4 in which the shape of the main pipe portion 41 is uniform in the axial direction.

  Next, with reference to FIG. 6, the nozzle part 31 'of 2nd Embodiment of the burr | flash removal apparatus 1 is demonstrated. In FIGS. 6 to 9, the same components as those of the nozzle unit 31 of the first embodiment are denoted by the same reference numerals. The nozzle portion 31 ′ of the second embodiment is different from the nozzle portion 31 of the first embodiment in that the baffle plate 319 is provided, and other configurations of the nozzle portion 31 ′ of the second embodiment. Is the same as the nozzle portion 31 of the first embodiment. Therefore, different points will be mainly described below.

  The nozzle portion 31 ′ includes a main body tube 311 extending along the axis, a support shaft 312 disposed in the main body tube 311, a plate-like tip member 313 supported at the tip of the support shaft 312, and a baffle plate 319. including. The main body tube 311 has a front end opening 314 and a rear end opening 315 at both ends in the axial direction. A hot air supply source 32 is connected to the rear end opening 315 so that the hot air supplied from the hot air supply source 32 is ejected from the front end opening 315. The support shaft 312 is supported by the main body tube 311 so as to extend into the main body tube 311 along the axis of the main body tube 311. The support shaft 312 is screwed into a nut portion 316 fixed to the main body tube 311, and can move in the axial direction relative to the main body tube 311 by rotating the support shaft 312 around the axis. The distal end member 313 is attached to the distal end of the support shaft 312 so as to be spaced from the distal end opening 314 of the main body tube 311 outside the main body tube 311, and the peripheral edge of the distal end opening 314 of the main body tube 311 and the distal end member A gap formed between the main body tube side surface 313 forms an injection port 317. The injection port 317 preferably extends so as to be similar to the shape of the outer edge of the mating surface of different cores arranged in the mold in order to form the internal passage of the resin molded product.

  The baffle plate 319 is provided between the peripheral edge of the distal end opening 314 of the main body tube 311 and the distal end member 313 so as to block a part of the ejection port 317. Depending on the design of the mold of the resin molded product, a weld line may be generated near the burr. In such a case, there is a possibility that hot air for removing burrs hits the weld line and induces the opening of the weld line. When the weld line is located in the vicinity of the burr, the baffle plate 319 prevents a hot air from directly hitting the weld line by blocking a part of the injection port 317 and suppresses the opening of the weld line due to heat. can do. The baffle plate 319 can have an appropriate shape as long as it can block a part of hot air ejected from the ejection port 317 and hit the weld line. A plurality of baffle plates 319 may be provided between the peripheral edge of the distal end opening 314 of the main body tube 311 and the distal end member 313. Further, the baffle plate 31 has a gap between the peripheral edge of the front end opening 314 of the main body tube 311 and the front end member 313 so that the hot air can be applied to the burr while preventing the hot air from hitting the weld line. Only a part in the axial direction is blocked, that is, a gap is formed between the baffle plate 319 and the side surface of the tip member 313 on the main body pipe 311 side or the peripheral edge of the front end opening 314 of the main body pipe 11. It is preferable that In the nozzle portion 31 ′ shown in FIG. 6, the baffle plate 319 is provided so as to protrude in the axial direction from the peripheral edge of the distal end opening 314 of the main body tube 311 toward the distal end member 313. Depending on the position, the tip member 313 may be provided so as to protrude in the axial direction from the side surface on the main body tube 311 side toward the main body tube 311.

  7 and 8 show a valve body 5 of a ball valve which is an example of a resin molded product suitable for applying the burr removing device 1 having the nozzle portion 31 ′. In FIG. 7 and FIG. 8, the spool and runner of the resin molded product are omitted for simplification of description. The valve body 5 of the ball valve is only given as an example of a resin molded product in which a weld line can occur in the vicinity of the burr, and there is no intention to limit the application target to the valve body 5 of the ball valve. That is, the burr removing device 1 having the nozzle portion 31 ′ can be applied to a valve molded body other than the ball valve and a resin molded product having other internal passages such as a pipe joint.

  The valve main body 5 includes a cylindrical main pipe portion 51 that functions as a flow path and a valve chamber, at least one branch pipe portion 52 that is a through hole provided in a side wall for penetrating the stem, a gate portion 56, including. In the case of such a shape, a burr | flash generate | occur | produces in the mating surface of the core for forming the main pipe part 51, and the core for forming the branch pipe part 52. In addition, since the plane part 55 for preventing a stem from moving by fluid pressure exists in the upper part of the part which functions as a valve chamber of the main part 51, it is branched with the core for forming the main part 51 The core mating surface for forming the tube portion 52 has a simple planar circular shape. A tapered surface 58 is provided at the opening to the main pipe portion 51 of the branch pipe portion 52 that is a through hole for penetrating the stem, and the diameter of the branch pipe portion 52 increases toward the main pipe portion 51. It has come to do. Since the tapered surface 58 is provided at the opening of the branch pipe portion 52, the assembly of the stem is facilitated. Further, by removing the burrs in the molding process using a take-out machine, it is possible to supply the molded product as a part without performing post-processes such as burr removal and chamfering after molding. In the valve body 5 shown in FIGS. 7 and 8, burrs are generated at the positions shown by the broken lines 53. In addition, the gate portion is located at the position indicated by reference numeral 56 and a core for forming the main pipe portion 51 is disposed at the center of the mold cavity. Since the merge occurs in the vicinity of the weld line generation unit 54 adjacent to 53, a weld line is generated in the vicinity of the weld line generation unit 54. In FIG. 7, the weld line generation unit 54 is drawn in a straight line, but the generation position of the actually generated weld line varies depending on the flow state of the molten resin.

  When a weld line is generated in the vicinity of the burr 53 as in the valve body 5 shown in FIGS. 7 and 8, when the burr 53 is removed by injecting hot air from the nozzle portion 31 of the first embodiment, There is a possibility that hot air hits the weld line and opens. On the other hand, if the nozzle portion 31 ′ of the second embodiment is used, the shape of the baffle plate 319 and the hot air injected from the injection port 317 can be prevented from hitting the weld line as shown in FIG. By designing the dimensions and disposing the baffle plate 319 so as to face the weld line, the hot air sprayed from the jet port 317 is prevented from directly hitting the weld line, and the weld line is prevented from opening due to the hot air. It becomes possible to do.

  The deburring procedure using the deburring device 1 having the nozzle portion 31 ′ is such that the angular position around the axis is required to be positioned so that the baffle plate 319 faces the weld line. Since it is the same as the deburring device 1 having the nozzle portion 31 of the first embodiment, the description is omitted here.

  The burr removing apparatus according to the present invention has been described above with reference to the illustrated embodiment, but the present invention is not limited to the embodiment. For example, a notch portion is provided in an appropriate portion of the valve body 5 and a protrusion that engages with the notch portion is provided in the main body tube 311 of the nozzle portion 31 ′ so that the notch portion of the valve body 5 and the nozzle portion 31 ′ are provided. It is also possible to position the baffle plate 319 so as to face the weld line by engaging the projection of the main body tube 311.

DESCRIPTION OF SYMBOLS 1 Burr removal apparatus 2 Product removal apparatus 3 Burr removal mechanism 4 Pipe joint 5 Valve body 31, 31 'Nozzle part 32 Hot air supply part 33 Mounting base 41, 51 Main pipe part 42, 52 Branch pipe part 43 Burr 311 Main body pipe 312 Support Shaft 313 Front end member 314 Front end opening 315 Rear end opening 316 Nut portion 317 Injection port 318 Heat insulation layer 319 Baffle plate 431 Bari 432 Bari

Claims (7)

A burr removing device for removing a burr generated on a peripheral wall of an internal passage of a resin molded product,
A nozzle part that can be inserted into the internal passage of the resin molded product and has an annular injection port formed at a tip part thereof, and a hot air supply source that supplies hot air to the nozzle part, the annular injection port being a burr The nozzle portion is moved so as to be opposed to the hot air supplied from the hot air supply source locally from the injection port of the nozzle portion toward the burr generated in the internal passage of the resin molded product. A burr removing device that removes the burr by spraying.   The injection port of the nozzle portion extends so as to have a shape similar to the shape of the outer edge of a mating surface of different cores arranged in a mold to form the internal passage of the resin molded product. Item 2. A deburring apparatus according to item 1.   The nozzle portion extends along an axis and has a main body tube having a front end opening and a rear end opening at both ends in the axial direction, a support shaft disposed in the main body tube, and a front end of the main body tube outside the main body tube. A tip member supported at the tip of the support shaft so as to be spaced apart from the opening, hot air is supplied from the hot air supply source to the rear end opening of the body tube, and the tip of the body tube The burr removing device according to claim 1 or 2, wherein a gap between a peripheral edge of the opening and the tip member forms an injection port for injecting hot air.   The deburring device according to claim 3, wherein the support shaft is supported by the main body tube so as to be movable in the direction of the axis.   The burr removing device according to any one of claims 1 to 4, wherein the nozzle portion further includes a baffle plate for blocking a part of hot air ejected from the ejection port of the nozzle portion.   The burr | flash removal apparatus as described in any one of Claims 1-5 with which the outer peripheral part of the said main body pipe | tube of the said nozzle part is covered with the heat insulation layer.   The resin molded product further comprising a product take-out device for gripping and taking out the molded resin molded product from a mold for molding the resin molded product, wherein the nozzle portion is held by the product take-out device The deburring device according to any one of claims 1 to 6, wherein the deburring device is inserted into the internal passage.

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