JP2005335193A - Valve device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve device which is used in an injection mold and ensures the flowability of a resin by keeping the temperature of the resin in the tapering nozzle, which is equipped with a nozzle orifice, provided to a casing provided with a material passage to a high temperature. <P>SOLUTION: A heater 43 is provided between a nozzle constituting dividing piece 44 and a casing body 42. The joining surfaces 44A and 42B of the nozzle constituting dividing piece 44 and the casing body 42 are pressed under predetermined pressure and a DC current and/or a pulse current is allowed to flow through the nozzle constituting dividing piece 44 and the casing body 42 while holding the pressed state to temporarily join the joining surfaces 44A and 42B of the nozzle constituting dividing piece 44 and the casing body 42, and the nozzle constituting dividing piece 44 and the casing body 42 in the temporarily joined state are heat-treated at a predetermined atmospheric temperature. The heat of the heater 43 is transmitted to the nozzle 40 to hold the molten state of the resin on the side of the nozzle 40 to ensure the flowability of the resin. The joining surfaces 42B and 44A can be joined without using a welding auxiliary material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a valve device and a manufacturing method thereof.

  2. Description of the Related Art A valve device that mechanically opens and closes a gate with a valve pin is known in a hot runner mold apparatus that heats a resin that is a molding material in a material passage to a product cavity and keeps it in a molten state at all times. In the conventional valve device, a main heater is provided on the outer peripheral portion of the casing, and the resin in the casing is heated by the main heater so as to maintain a molten state and ensure fluidity.

  By the way, the nozzle formed at the end portion of the material passage in the casing cannot be provided with a main heater on the outer periphery thereof. As a result, the resin temperature of the material passage is lowered in the nozzle, and the fluidity may be lowered. . This is because the nozzle has a tapered shape and a main heater cannot be provided on the outer periphery thereof.

  To solve such problems, for example, a hole is formed in the nozzle by a drill, a heater is inserted into the hole, or a gap is formed in the hole formed in the mold, and a casing is provided. Since a heat transfer body is provided between the casing and the mold body in the axial direction intermediate portion of the casing so that heat is radiated from the casing to the mold body, the temperature in the axial direction intermediate portion of the casing decreases, and the casing material What reduces the temperature difference of the resin in a channel | path etc. is known (for example, patent document 1).

Further, the joining surfaces of a plurality of members that are joined to each other in the mold are abutted against each other without using a graphite die, and at least one of a desired direct current and pulse current is applied to the member while pressing the member with a desired pressure. There is also known an energization joining method or the like in which an electric current is supplied and temporarily joined, and the temporarily joined members are heat-treated under a desired temperature condition (for example, Patent Document 2).
JP 2002-331552 A JP 2002-59270 A

  In the prior art, when a heater is inserted into a hole formed by drilling in a nozzle, the hole becomes linear, and there is a problem that it is difficult to insert the heater up to the tip side of the nozzle. In addition, although the temperature difference of the resin in the material passage in the casing can be reduced by providing the heat transfer body, it is difficult to keep the material passage in the nozzle portion having a tapered nozzle hole and thus the resin at a high temperature. There is a problem.

  The problem to be solved is that the resin temperature in a tapered nozzle provided with a nozzle hole provided in a casing provided with a material passage is used for an injection mold, and the fluidity of the resin is secured. is there.

  The invention according to claim 1 is used in an injection mold in which a product cavity is formed between a pair of mold bodies, and resin is supplied into the product cavity via a gate, and the hole is formed in the mold body. In a valve device provided with a nozzle provided with a nozzle having a nozzle hole that is incorporated and communicated with the tip of the material passage so as to face the gate, and provided with a valve pin that is provided in the casing so as to advance and retreat, and opens and closes the gate. The casing is formed by integrally joining the nozzle constituent divided piece and the casing body, a heater is provided between the nozzle constituent divided piece and the casing main body, and a joint surface between the nozzle constituent divided piece and the casing main body is provided in a predetermined manner. While pressing with pressure and holding the pressed state, a direct current and / or pulse is applied to the nozzle component divided piece and the casing body. The nozzle configuration division piece and the casing main body are temporarily joined to each other, and the nozzle configuration division piece and the casing main body in the temporarily joined state are heat-treated at a predetermined atmospheric temperature, thereby dividing the nozzle configuration division. The valve device is characterized in that the heater is provided between a piece and the casing body.

  The invention of claim 2 is used in an injection mold in which a product cavity is formed between a pair of mold bodies, and resin is supplied into the product cavity via a gate, and in a hole formed in the mold body. In a valve device provided with a casing provided with a nozzle provided with a nozzle hole which is incorporated and communicated with the tip of the material passage so as to face the gate, and provided with a valve pin which is provided in the casing so as to be movable forward and backward. The casing is formed by integrally joining a nozzle constituent divided piece with a casing body, a heater is provided between the nozzle constituent divided piece and the casing main body, and the nozzle constituent divided piece, the heater, and the casing main body are provided. Each joint surface is pressed with a predetermined pressure, and while maintaining this pressed state, the nozzle component divided piece, the heater, and the front A direct current and / or pulse current is passed through the casing body to temporarily join the nozzle constituent divided pieces, the heater and the respective joining surfaces of the casing main body, and the nozzle constituent divided pieces in the temporarily joined state and the The valve device is characterized in that the heater and the casing body are heat-treated at a predetermined atmospheric temperature, and the heater is provided between the nozzle component divided piece and the casing body.

  The invention of claim 3 is used in an injection mold in which a product cavity is formed between a pair of mold bodies, and resin is supplied into the product cavity via a gate, and in a hole formed in the mold body. A method of manufacturing a valve device including a casing provided with a nozzle having a nozzle hole that is incorporated and communicated with the tip of a material passage so as to face the gate, and a valve pin that is provided in the casing so as to be movable forward and backward. The casing is formed of a nozzle constituent divided piece and a casing main body, and after interposing a heater between the nozzle constituent divided piece and the casing main body, a predetermined joint surface between the nozzle constituent divided piece and the casing main body is provided. While maintaining this pressed state, the nozzle component divided piece and the casing body are fed with a direct current and Alternatively, a pulse current is allowed to flow to temporarily join the joint surface of the nozzle constituent divided piece and the casing main body, and the nozzle constituent divided piece and the casing main body in the temporarily joined state are heat-treated at a predetermined atmospheric temperature, and the nozzle It is a manufacturing method of a valve device, wherein the heater is provided between a constituent divided piece and the casing body.

  The invention of claim 4 is used in an injection mold in which a product cavity is formed between a pair of mold bodies, and resin is supplied into the product cavity via a gate, and in a hole formed in the mold body. A method of manufacturing a valve device including a casing provided with a nozzle having a nozzle hole that is incorporated and communicated with the tip of a material passage so as to face the gate, and a valve pin that is provided in the casing so as to be movable forward and backward. The casing is formed by a nozzle constituent divided piece and a casing body, and after interposing a heater between the nozzle constituent divided piece and the casing main body, the nozzle constituent divided piece, the heater, and the casing main body, respectively. The bonded surface of the nozzle is pressed with a predetermined pressure, and while maintaining the pressed state, the nozzle component divided piece and the heater The nozzle component divided piece in a temporarily bonded state by passing a direct current and / or a pulse current through the casing body to temporarily bond the nozzle component divided piece, the heater, and the joining surfaces of the casing body. The heater and the casing main body are heat-treated at a predetermined atmospheric temperature, and the heater is provided between the nozzle component divided piece and the casing main body.

  A fifth aspect of the present invention is the method for manufacturing a valve device according to the third or fourth aspect, wherein the pressure is 50 megapascals or less.

  A sixth aspect of the present invention is the valve device manufacturing method according to any one of the third to fifth aspects, wherein the heat treatment is performed in an inert atmosphere.

  According to a seventh aspect of the present invention, in the valve device according to any one of the third to sixth aspects, the temperature of the heat treatment is in a temperature range of 55% to 85% of a melting point of members to be joined. It is a manufacturing method.

  According to the first aspect of the present invention, the heat of the heater can be reliably transmitted to the nozzle side to maintain the molten state of the resin on the nozzle side, the fluidity thereof can be ensured, and the nozzle can be used without using a welding auxiliary material. The joining surfaces of the constituent divided pieces and the casing body can be joined uniformly.

  According to the invention of claim 2, the heat of the heater is reliably transmitted to the nozzle side, the molten state of the resin on the nozzle side can be maintained, and its fluidity can be secured, and the nozzle can be used without using a welding auxiliary material. The respective joint surfaces of the component divided pieces, the heater, and the casing body can be joined uniformly.

  According to the invention of claim 3, the heat of the heater can be reliably transmitted to the nozzle side, the molten state of the resin on the nozzle side can be maintained, and its fluidity can be secured, and the nozzle can be used without using a welding auxiliary material. It can be manufactured by uniformly joining the joining surfaces of the component divided pieces and the casing body.

  According to the invention of claim 4, the heat of the heater can be reliably transmitted to the nozzle side to maintain the molten state of the resin on the nozzle side, and the fluidity can be secured, and the nozzle can be used without using a welding auxiliary material. It can be manufactured by uniformly joining the respective joining surfaces of the component divided pieces, the heater, and the casing body.

  According to the invention of claim 5, the apparatus for pressurization is not increased in size.

According to the invention of claim 6, the quality of the joining portion is stabilized by performing the heat treatment in an inert atmosphere. According to the invention of claim 7, the temperature of the heat treatment is 55% to the melting point of the members to be joined. A temperature range of 85% is preferable from the viewpoint of heat treatment.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

  1 to 5 show a first embodiment, in which a casing 2 of a valve device 1 is inserted into a hole 4 formed in a main body 3 of a mold body such as a fixed-side mold plate. A valve pin 5 is provided in the direction Z. The casing 2 has the flange portion 2A at the end portion on the manifold side and the fixing ring 7 fixed to the outer peripheral surface of the end portion on the opposite gate 6 side fitted in the hole portion 4. It is supported by the body part 3 of the mold body, and in other parts, a gap described later forming a heat insulating layer is formed between the outer peripheral surface 2B of the casing 2 of the valve body 1 and the body part 3 of the mold body. Yes. Further, the inside of the casing 2 is a material passage 8 that communicates with the gate 6 and through which the molten resin flows. A valve pin 5 that passes through the material passage 8 and moves in the direction of the axis Z to open and close the gate 6 is provided. A main heater 9 for heating the resin in the material passage 8 is provided on the outer peripheral surface 2B of the casing 2, and a cylindrical main heater cover 10 that covers the main heater 9 from the outer peripheral side is fixed. Yes. In addition, the main heater 9 is arrange | positioned in the location of substantially the same diameter between the flange part 2A and the fixing ring 7 in the outer peripheral surface 2B. The main heater 9 is composed of, for example, a linear heater, and is wound around the outer peripheral surface 2B of the casing 2.

  More specifically, in the figure, 11 is a fixed mold, 12 is a movable mold, and the fixed mold 11 and the movable mold 12, which are mold bodies, move to each other in the vertical direction (mold opening / closing direction) to open and close to close the mold. Sometimes product cavities 13 having a product shape are formed between them. The fixed mold 11 includes a metal fixed-side mold plate 3 as a main body, and a fixed-side mounting plate (not shown) fixed to the back side of the fixed-side mold plate 3 via a spacer block. A manifold 16 is provided between the fixed side mounting plate and the fixed side mold plate 3. The manifold 16 has a runner 17 that is a material passage formed therein, and the thermoplastic resin that is a molding material in the runner 17 is constantly melted by heating of a main heater (not shown) provided in the manifold 16. It is to be kept in a state. The fixed-side template 3 may be constituted by a plurality of members by adding a fixed-side receiving plate or a gate bush. Further, the hole 4 is formed through the fixed-side template 3, and the tip of the hole 4 on the movable mold 12 side is a gate 6 communicating with the product cavity 13.

  The valve device 1 for opening and closing the gate 6 will be described in detail. A valve body 1 having the axial direction of the mold opening / closing direction is incorporated in the hole 4 of the stationary side mold plate 3. Most of the valve body 1 is constituted by a cylindrical casing 2, and one end portion of the casing 2 is a flange portion 2 </ b> A which is fixed and supported between the manifold 16 and the stationary side template 3. Yes. At the same time, the flange portion 2A is fitted into a step portion 23 formed at the end portion on the manifold 16 side in the hole portion 4. Further, a fixing ring 7 is fitted and fixed to the outer peripheral surface of the end portion on the gate 6 side in the casing 2, and the fixing ring 7 is formed on a columnar fitting surface 24 formed in the hole 4. It is mated. Thereby, the gate 6 side portion of the casing 2 is supported by the fixed-side template 3. As described above, the valve body 1 is in contact with the fixed-side template 3 at both ends, but in other parts, a heat insulating gap is provided between the outer surface of the valve body 1 and the inner surface of the hole 4. 25 and 26 are formed. The gaps 25 and 26 are blocked by the fixing ring 7, and the gap 25 on the gate 6 side of the fixing ring 7 is a resin heat insulating layer that communicates with the gate 6 and into which resin as a molding material flows. The gap 26 becomes an air insulation layer.

  Further, the inside of the casing 2 is a material passage 8 that allows the runner 17 in the manifold 16 to communicate with the gate 6. The material passage 8 has a substantially cylindrical shape with the die opening / closing direction as the axial direction Z, but the end on the runner 17 side is a bent portion 31 that is bent. The bent portion 31 is formed by embedding the insert 32 in the casing 2. In addition, three or more support blades 33 extending in the mold opening and closing direction are formed on the inner peripheral surface of the tip of the material passage 8 on the gate 6 side. The casing 2 is provided with a temperature sensor (not shown) along the inner side of the main heater 9, and this temperature sensor is located in the vicinity of the tip of the main heater 9 on the gate 6 side.

  In the casing 2, the valve pin 5 moves in the mold opening / closing direction by driving of a driving device such as a hydraulic cylinder device (not shown) provided on the fixed side mounting plate. The valve pin 5 is configured such that a gate closing portion 37 formed at the distal end portion on the gate 6 side is detachably fitted to the gate 6 to close the gate 6. Further, the valve pin 5 has an axial direction Z as a mold opening / closing direction, and an outer peripheral surface thereof is slidably in contact with an inner edge of the support blade 33 of the casing 2 at all times. Thereby, the front-end | tip part by the side of the gate 6 of the valve pin 5 is supported. Further, the valve pin 5 is supported by a guide bush 38 fixed in the insert 32 at the end of the valve body 1 on the manifold 16 side. That is, the valve pin 5 penetrates the guide bush 38 slidably. The valve pin 5 is connected to a driving device provided on the fixed side mounting plate.

  Furthermore, the nozzle 40 is formed in a tapered shape on the gate 6 side from the end of the casing 2, that is, the part fitted to the fixing ring 7, and the nozzle hole 41 faces the gate 6 at the center (axis Z). In addition, the nozzle hole 41 is provided so that the gate closing portion 37 can be removably fitted. This nozzle 40 is obtained by joining a separate nozzle component division piece 44 to a tapered tip end portion 42A of a casing main body 42 that forms the main portion of the casing 2, and integrally joining the tip portion 42A and the nozzle. A heater 43 is provided between the component divided pieces 44. In the casing main body 42, the main heater 9 is provided on the outer peripheral surface 2B, the material passage 8 is formed, and the valve pin 5 is provided at the center. The nozzle component divided piece 44 is formed of the same material or the same material in strength and thermal conductivity as the casing main body 42, and the heater 43 is formed of a material having flexibility. It is a relatively elongated shape called a cartridge heater or the like. A gap formed in a part between the curved convex joint surface 42B of the tapered tip 42A of the casing main body 42 and the curved concave joint surface 44A of the nozzle component segment 44. The lead wire 43R side of one side 43A is arranged on the outer peripheral surface 2B side. On the other hand, the other side 43B of the heater 43 is inserted into a gap 45 along the curved surfaces of the joining surfaces 42B and 44A so as to come close to the nozzle hole 41 on the nozzle component divided piece 44 side or face the nozzle hole 41. It has become. A stepped portion 44B that fits into the fixing ring 7 is formed on the outer peripheral surface of the nozzle constituent divided piece 44 formed with a part of the nozzle hole 41 at the tip.

  In the figure, reference numeral 51 denotes a movable side mold plate of the movable mold 12, and this movable side mold plate 51 forms the product cavity 13 together with the fixed side mold plate 3. In addition, a fluid passage (not shown) through which a cooling fluid such as water for cooling the product cavity 13 passes is formed in the fixed side mold plate 3 and the movable side mold plate 46.

  Next, a method for joining the casing main body 42 and the nozzle component divided piece 44 in the valve device 1 will be described. The heater 43 is closely inserted into the gap 45 and fixed to the casing body 42 and the nozzle component divided piece 44. First, the joining surfaces 42B and 44A of the casing main body 42 and the nozzle constituent divided piece 44 are aligned with each other and overlapped vertically using a known positioning means, etc., and the casing main body 42 and the nozzle constituent divided piece 44 are overlapped vertically. The combined laminated body 60 is mounted on an energization joining apparatus and the joining surfaces are joined.

  FIG. 7 shows the overall configuration of the energization joining apparatus of this example. As shown in the figure, the energization joining apparatus T of this example includes an energization joining machine 70 and a heat treatment machine 80. The energization bonding machine 70 is disposed above the base 72 and a lower energizing electrode 73 that is electrically insulated from the base 72 and fixed on the base 72 by a known method via an insulating member. A fluid pressure cylinder 74 supported on the base 72 by a known method, and fixed to the tip of the piston rod 75 of the fluid pressure cylinder 74 by an insulation member and electrically insulated from the piston rod 75 by a known method. And an upper energizing electrode 76.

  The fluid pressure cylinder 74 functions as a pressurizing device that presses the material to be joined. As the pressurizing device, the upper energizing electrode 76 may be moved up and down using an electric motor, a screw mechanism or the like instead of the fluid pressure cylinder. The upper and lower energization electrodes 73 and 76 are electrically connected to a power supply device 77, and the power supply device 77 can supply a DC pulse current. The power supply of the power supply device 77 of this example is a large current power having a voltage of 100 V or less and a current in the range of 2000 to 5000A. In this example, the upper energizing electrode 76 can be moved, but conversely, the lower energizing electrode 73 can be moved, or both can be moved.

  Next, the heat treatment machine 80 includes a vacuum heat treatment furnace having a known structure. In addition, it can also be set as the apparatus structure which integrated the electricity joining machine 70 and the heat processing machine 80, and can also be set as the structure which can move these. Of course, these may be arranged separately.

  Next, a procedure for mutually joining the casing main body 42 and the nozzle component divided piece 44 constituting the laminated body 60 using the current-carrying joining apparatus T having this structure will be described.

  The nozzle hole 41 divided into two is finished in advance by polishing, and the joining surface 42B and the joining surface 44A are also polished.

  First, the laminate 60 is sandwiched between the energizing electrodes 73 and 76, the fluid pressure cylinder 74 is driven, and the upper energizing electrode 76 is lowered by the piston rod 75. As a result, the laminate 60 is sandwiched between the energizing electrodes 73 and 76 and is pressed with a predetermined pressing force. A predetermined pressing force is applied between the joining surfaces 42B and 44A. Although this pressing force varies depending on the material of the member, it may be 50 megapascals or less.

  As a result, the joint surfaces 42B and 44A are joined to each other. Although the exact principle of this joining is not necessarily clear, it is thought that joining is performed by the generation of discharge plasma between joining surfaces, the thermal diffusion effect by Joule heat, the electrolytic diffusion effect by an electric field, and the like.

  Here, even when only a predetermined value of direct current is passed through the laminate 60, or when both direct current and pulse current are passed simultaneously, it is possible to form a state in which the joining surfaces 42B and 44A are joined together. confirmed.

  The state in which the respective joining surfaces 42B and 42A are joined in this manner is not yet complete from the viewpoint of joining strength. Therefore, this bonded state is referred to as a temporary bonded state, and the laminate 60 in the temporary bonded state is referred to as a temporary bonded body.

  This temporary joined body is heat-treated in an inert atmosphere in a heat treatment furnace of the heat treatment machine 80. The heat treatment temperature and time vary depending on the material and size of the member, but the heat treatment temperature is desirably in the temperature range of 55% to 85% of the lowest melting point of the members to be joined. By performing the interdiffusion heat treatment, the joint between the joint surfaces 42B and 44A in the temporarily joined state becomes perfect and a completely joined body is obtained. That is, the casing 2 in which the joint strength between the joint surfaces 42B and 44A is comparable to the material strength of the member is obtained. Note that annealing is performed after the mutual diffusion processing is performed.

  The current used in the bonding method and apparatus used in the present invention is a direct current, a pulse current, and a combination current of a direct current and a pulse current. Among these, a pulse current and a combination current of a direct current and a pulse current are used. In some cases, a pulse current always flows, so it can be called a pulse energization joining method and apparatus.

  Moreover, this joining method has the following effects. There is no need to use a graphite mold unlike the conventional spark plasma sintering method. Joining is possible without using any welding aids. The entire joining surface can be joined uniformly over the entire surface. It can be easily joined only by making the joining surface flat. The joint strength can be increased by increasing the planar accuracy of the joint surface. The joint strength can be made the same as the strength of the material of the metal member to be joined. Bonding can be performed with a small deformation of the bonding portion. There is no need for post-processing such as removal of welding aids and wax around the joint. It is possible to easily join the fine portions. Since the parts to be joined can be joined after being completed as parts, those having complicated shapes can be assembled by joining. It is possible to join without impairing the properties of the members to be joined. Metal members of different materials can be easily joined. Bonding is possible by appropriately controlling the temperature of the portion other than the bonding portion. A plurality of parts having different shapes can be joined simultaneously.

  The casing 2 obtained through the heat treatment described above has a heater 43 incorporated between the joining surfaces 42B and 44A of the tapered nozzle 40 by joining the joining surfaces 42B and 44A. Further, the bonding strength between the bonding surfaces 42B and 44A can be made as strong as the strength of the base material.

  As described above, the joining surfaces 42B and 44A are processed into smooth surfaces in advance, and preferably processed into mirror surfaces. The joint surfaces 42B and 44A may be rough surfaces (surface roughness is about ▽ in JIS standard), but it is preferable to process into a mirror surface because the joint strength of the member is high and deformation due to joining can be reduced. The numerical range of the mirror surfaces on the joining surfaces 42B and 44A is not necessarily clear, but here refers to a surface processed state having a numerical smoothness of Ra 0.3 or less (the smaller the numerical value, the higher the smoothness).

  Next, the effect | action is demonstrated about the said structure. First, the fixed mold 11 and the movable mold 12 are closed, and a product cavity 13 is formed between the fixed mold 11 and the movable mold 12, and then the valve pin 5 is moved away from the movable mold 12 as shown by a chain line in FIG. The gate 6 is opened by moving in the direction. Then, a molten thermoplastic resin, which is a thermoplastic molding material, is injected into the fixed mold 11 from the injection molding machine. This resin flows through the runner 17 of the manifold 16 and the like, and further flows into the product cavity 13 from the gate 6 through the material passage 8 in the valve body 1 and the support blades 33 in which the valve pins 5 are fitted. After the resin is filled in the product cavity 13 in this way, after holding pressure, the valve pin 5 moves toward the movable mold 12 as shown by the solid line in FIG. Close the gate 6. The resin in the product cavity 13 is actively cooled by the cooling fluid passing through the fluid passage. Then, after the resin in the product cavity 13 is cooled and solidified, the fixed mold 11 and the movable mold 12 are opened, and the resin in the product cavity 13, that is, the molded product is taken out. Thereafter, the mold is closed again and the above molding cycle is repeated. Through the entire molding cycle, the resin in the material passage 8 of the valve body 1 is the outer periphery of the valve body 1 in the same manner as the resin in the runner 17 of the manifold 16. The main heater 9 in the section is always kept in a molten state by heating.

  The main heater 9 directly heats the casing main body 42 to keep the resin in the casing main body 42 in a molten state, and the heat of the heater 43 is efficiently transferred from the other side 43B toward the nozzle hole 41 side. Heat transfer is performed and the area around the nozzle hole 41 is heated to keep the resin in the molten state, and the fluidity can be ensured.

  As described above, in the embodiment, the casing 2 is formed by integrally joining the nozzle component divided piece 44 with the casing main body 42, and the heater 43 is provided between the nozzle component divided piece 44 and the casing main body 42. Thus, the heat of the heater 43 is transmitted to the nozzle 40 side, the molten state of the resin on the nozzle 40 side can be maintained, and the fluidity can be ensured. Further, the joining surfaces 44A and 42B of the nozzle component divided piece 44 and the casing main body 42 are pressed with a predetermined pressure, and while maintaining this pressed state, the nozzle component divided piece 44 and the casing main body 42 are connected to the DC current and / or Alternatively, a pulse current is passed to temporarily join the nozzle constituent divided pieces 44 and the joining surfaces 44A and 42B of the casing body 42, and the nozzle constituent divided pieces 44 and the casing main body 42 in the temporarily joined state are brought into a predetermined atmosphere. By providing the heater 43 between the nozzle component divided piece 44 and the casing body 42 by heat treatment at a temperature, the joining surfaces 42B and 44A can be joined without using any welding auxiliary material. The entire surfaces of 42B and 44A can be joined uniformly. Since no welding auxiliary material is used in this way, the welding auxiliary material does not appear in the nozzle hole 41 and the like, and the valve pin 5 can be incorporated well. Further, the heater 43 can be freely arranged by providing the heater 43 between the joining surfaces 42B and 44A. Furthermore, the heater 43 can be freely disposed by providing the heater 43 between the curved joining surfaces 42B and 44A.

  The casing 2 is formed by a nozzle constituent divided piece 44 and a casing main body 42, and after interposing a heater 42 between the nozzle constituent divided piece 44 and the casing main body 42, The joining surfaces 44A and 42B of the casing main body 42 are pressed with a predetermined pressure, and while maintaining this pressed state, a direct current and / or a pulse current is passed through the nozzle component divided piece 44 and the casing main body 42, The nozzle configuration divided piece 44 and the joining surfaces 44A and 42B of the casing main body 42 are temporarily joined, and the nozzle constituent divided piece 44 and the casing main body 42 in the temporarily joined state are heat-treated at a predetermined atmospheric temperature to form the nozzle configuration. By providing the heater 42 between the split piece 44 and the casing body 42, it is possible to join without using any welding auxiliary material, the nozzle component split piece 44 and the Pacing body 42 can strongly bonded and moreover, can be uniformly bonded joint surface 44A, the entire surface of 42B. And since a welding auxiliary material is not used, a welding pin does not come out to the nozzle hole 41 grade | etc., And the valve pin 5 can be integrated favorably.

  Further, in this embodiment, since the pressure is 50 megapascals or less, the apparatus for pressurization is not increased in size.

  Further, in this embodiment, since the heat treatment is performed in an inert atmosphere, the quality of the joint portion is stabilized.

  Further, in this embodiment, since the temperature of the heat treatment is in the temperature range of 55% to 85% of the melting point of the members to be joined, a favorable joining state can be obtained from the viewpoint of heat treatment.

  A second embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part as Example 1, and the detailed description is abbreviate | omitted.

  In the first embodiment, the joining surfaces 44A and 42B of the nozzle component divided piece 44 and the casing main body 42 are pressed with a predetermined pressure, and a DC current is applied to the nozzle component divided piece 44 and the casing main body 42 while maintaining this pressed state. And / or a pulse current is supplied to temporarily join the nozzle component divided piece 44 and the joining surfaces 44A and 42B of the casing body 42, and the nozzle component divided piece 44 and the casing main body 42 in the temporarily joined state are predetermined. Although the heater 43 is provided between the nozzle component divided piece 44 and the casing main body 42 by heat treatment at the ambient temperature, the nozzle component divided piece 44, the heater 43, and the casing are used in the second embodiment. Each joining surface of the main body 42, that is, the joining surface 44A of the nozzle component divided piece 44 and the joining surface 43C outside the heater 43, and the joining surface 43D inside the heater 43 and the joining surface 42B are pressed with a predetermined pressure. While maintaining this pressed state, a direct current and / or a pulse current is passed through the nozzle component divided piece 44, the heater 43, and the casing body 42, so that the nozzle component divided piece 44, the heater 42, and the The joint surfaces 44A, 43C, 43D, and 42B of the casing body 41 are temporarily joined, and the nozzle component divided piece 44, the heater 43, and the casing body 41 in the temporarily joined state are heat-treated at a predetermined ambient temperature. The heater 43 is provided between the nozzle constituent divided piece 44 and the casing body 41.

  Accordingly, also in the second embodiment, similarly to the first embodiment, the heat of the heater 43 is transmitted to the nozzle 40 side, the molten state of the resin on the nozzle 40 side can be maintained, and the fluidity can be ensured. Furthermore, the joining surfaces 44A, 43C, 43D, and 42B can be joined without using a welding auxiliary material, and the entire joining surfaces 44A, 43C, 43D, and 42BB can be joined uniformly. Since no welding auxiliary material is used in this way, the welding auxiliary material does not appear in the nozzle hole 41 and the like, and the valve pin 5 can be incorporated well.

  As described above, the present invention can also be applied to various valve devices.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole longitudinal cross-sectional view which shows Example 1 of this invention. It is a plane sectional view showing Example 1 of the present invention. It is a longitudinal cross-sectional view of the principal part which shows Example 1 of this invention. It is a longitudinal cross-sectional view which shows the decomposition | disassembly state of the principal part which shows Example 1 of this invention. It is a schematic block diagram of the electricity joining apparatus which shows Example 1 of this invention. It is sectional drawing which shows Example 2 of this invention. It is a longitudinal cross-sectional view which shows the decomposition | disassembly state which shows Example 2 of this invention.

Explanation of symbols

2 Casing 2B Outer peripheral surface 4 Hole 5 Valve pin 6 Gate 8 Material passage 9 Main heater
11 Fixed type
12 Movable type
13 Product cavity
40 nozzles
41 Nozzle hole
42 Casing body
42B joint surface
43 Heater
43A one side
44 Nozzle composition piece
44A joint surface
45A joint surface

Claims (7)

  A product cavity is formed between a pair of mold bodies, used in an injection mold for supplying resin into the product cavity via a gate, and incorporated in a hole formed in the mold body, and at the tip of a material passage And a valve device provided with a valve pin that is provided in the casing so as to be able to advance and retreat, and that opens and closes the gate. It is formed by integrally joining with the casing body, a heater is provided between the nozzle constituent divided piece and the casing main body, and the joint surface between the nozzle constituent divided piece and the casing main body is pressed with a predetermined pressure, and this pressing is performed. While maintaining the state, a direct current and / or a pulse current is passed through the nozzle constituent divided piece and the casing body, Temporarily joining the joining surface of the slur component divided piece and the casing body, heat treating the nozzle component divided piece and the casing body in the temporarily joined state at a predetermined ambient temperature, and A valve device comprising the heater in between.   A product cavity is formed between a pair of mold bodies, used in an injection mold for supplying resin into the product cavity via a gate, and incorporated in a hole formed in the mold body, and at the tip of a material passage A valve device provided with a casing provided with a nozzle having a nozzle hole communicating with the gate facing the gate, and a valve pin that is provided in the casing so as to be movable forward and backward, and opens and closes the gate. Are integrally joined to the casing main body, a heater is provided between the nozzle constituent divided piece and the casing main body, and each joint surface of the nozzle constituent divided piece, the heater, and the casing main body is defined by a predetermined amount. While pressing with pressure and holding the pressed state, the nozzle component divided piece, the heater and the casing body A direct current and / or pulse current is passed to temporarily join the nozzle constituent divided pieces, the heaters, and the respective joining surfaces of the casing body, and the nozzle constituent divided pieces, the heaters, and the casing in a temporarily joined state. A valve device characterized in that a main body is heat-treated at a predetermined atmospheric temperature and the heater is provided between the nozzle constituent divided piece and the casing main body.   A product cavity is formed between a pair of mold bodies, used in an injection mold for supplying resin into the product cavity via a gate, and incorporated in a hole formed in the mold body, and at the tip of a material passage In a method of manufacturing a valve device provided with a casing provided with a nozzle having a nozzle hole that communicates with the gate, and a valve pin that is provided in the casing so as to be movable forward and backward, and opens and closes the gate, the casing has a nozzle configuration. The split piece and the casing main body are formed, and after a heater is interposed between the nozzle constituent split piece and the casing main body, the joining surface between the nozzle constituent split piece and the casing main body is pressed with a predetermined pressure. DC current and / or pulse current is applied to the nozzle component divided piece and the casing body while maintaining Then, the nozzle constituent divided piece and the casing main body are temporarily joined to each other, and the nozzle constituent divided piece and the casing main body in the temporarily joined state are heat-treated at a predetermined atmospheric temperature, A method for manufacturing a valve device, wherein the heater is provided between the casing bodies.   A product cavity is formed between a pair of mold bodies, and is used in an injection mold for supplying resin into the product cavity through a gate, and is incorporated into a hole formed in the mold body and at the front end of the material passage In a method of manufacturing a valve device provided with a casing provided with a nozzle having a nozzle hole that communicates with the gate, and a valve pin that is provided in the casing so as to be movable forward and backward, and opens and closes the gate, the casing has a nozzle configuration. A split piece and a casing main body are formed, and a heater is interposed between the nozzle constituent split piece and the casing main body, and then the nozzle constituent split piece, the heater, and the casing main body are joined at a predetermined pressure. The nozzle component divided piece, the heater, and the casing while holding the pressed state Direct current and / or pulse current are passed through the body to temporarily join the nozzle constituent divided pieces, the heaters, and the respective joining surfaces of the casing body, and the nozzle constituent divided pieces and the heaters in a temporarily joined state. And the casing main body is heat-treated at a predetermined atmospheric temperature, and the heater is provided between the nozzle component divided piece and the casing main body.   The method for manufacturing a valve device according to claim 3 or 4, wherein the pressure is 50 megapascals or less.   The method for manufacturing a valve device according to claim 3, wherein the heat treatment is performed in an inert atmosphere.   The method for manufacturing a valve device according to any one of claims 3 to 6, wherein the temperature of the heat treatment is in a temperature range of 55% to 85% of a melting point of members to be joined.

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