JP2005335195A - Molding equipment and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a flow speed by narrowing the flow channel area of a fluid passage while reducing fluid resistance in a molding equipment. <P>SOLUTION: Fluid dividing passage parts 35, 36, 85 and 86 having an almost halved circular cross section are provided and, when the fluid dividing passage parts 35, 36, 85 and 86 coincide with each other, the cross sections of fluid passages 31 and 81 are formed into an almost circular shape. The fluid passages 31 and 81 are formed between molding members 33 and 83 and mold bodies 34 and 84 and joining surfaces 33A, 34A, 83A and 84A are pressed under predetermined pressure and a DC current and/or a pulse current is allowed to flow through the molding members 33 and 83 and the mold bodies 34 and 84 while holding the pressed state to temporarily join the joining surfaces 33A, 34A, 83A and 84A of the molding members 33 and 83 and the mold bodies 34 and 84, and the molding members 33 and 83 and the mold bodies 34 and 84 in the temporarily joined state are heat-treated at a predetermined atmospheric temperature. The flow speed of a cooling liquid is increased by narrowing the area of a cooling liquid flow channel to enhance heat exchange efficiency. The molding members 33 and 83 and the mold bodies 34 and 84 can be joined without using a welding auxiliary material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mold apparatus and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a mold apparatus for molding an optical disk is known in which a plurality of molds are closed, a cavity for forming an optical disk is formed between the molds, and a thermoplastic molding material is filled in the cavity. Such a mold apparatus includes a pair of mold bodies that open and close each other to form a cavity between them when the mold is closed, and a cooling fluid passage is provided in the mold body, and a coolant is supplied to the fluid passage. By flowing, the rise of the mold temperature is prevented and the molten resin in the cavity is solidified at an early stage. In the conventional fluid passage, a groove-shaped fluid passage is formed by opening a surface opposite to the molding surface in the cavity forming member having a molding surface facing the cavity, and the opening side of the fluid passage is a molding member The mold body attached to the molding machine is blocked by the mold body (for example, Patent Document 1).

  In such a fluid passage shape, since the depth from the front end of the fluid passage, that is, from the molding surface side of the fluid passage to the opening is large, the flow passage area in the flow passage becomes wide, and a relatively large amount of coolant can flow. it can.

  However, it has been found that the cooling effect of the cooling liquid in the mold is higher when the flow rate is higher if the amount of the cooling liquid per unit time is constant. That is, if the flow path area is large, the flow rate becomes slow and the cooling effect becomes low.

  In order to solve such a problem, in a mold having a temperature adjusting fluid passage capable of adjusting a temperature by flowing a fluid, the mold includes a plurality of blocks joined to each other by a flat joining surface, and at least one of adjacent blocks is provided. A groove having a semicircular cross section defining a fluid passage for flowing the fluid is formed on the joint surface, and at least one of the plurality of blocks has an inlet port and an outlet port respectively communicating with the groove. There is known a molding die with a temperature adjusting fluid passage in which at least one of the above is formed, the plurality of blocks are temporarily joined by a pulse current joining method, and then heat-treated to complete the joining (for example, Patent Document 2).

Further, with respect to the joining technique, the joining surfaces of a plurality of members that are joined to each other in the mold are brought into contact with each other without using a graphite mold, and the desired direct current and pulse current are applied to the members while pressing the members with a desired pressure. There is also known an energization joining method or the like in which at least one current is supplied and temporarily joined, and the temporarily joined member is heat-treated under a desired temperature condition (for example, Patent Document 3).
JP 2002-331552 A JP 2002-59270 A JP 2002-200620 A

However, since the cross section of the fluid passage is semicircular in the prior art, there is a risk that when the coolant is flowed, the fluid resistance increases and the flow velocity may decrease, resulting in a decrease in the cooling effect of the mold. The molding cycle cannot be accelerated The problem to be solved is that a mold apparatus having a pair of mold bodies that open and close each other to form a cavity between them when the mold is closed, and in which a fluid passage is provided in the mold body In this case, the flow area of the fluid passage is narrowed to increase the flow velocity and reduce the fluid resistance.

  According to a first aspect of the present invention, there is provided a mold apparatus including a pair of mold bodies that open and close each other to form a cavity between the mold bodies when the mold is closed, and the mold body includes a fluid passage. A molding member having a facing molding surface, a mold body fixed to the molding member and mounted on the molding machine side, and a cross section obtained by dividing a substantially circular shape into both the molding member and the joint surface of the mold body Is provided with a substantially semicircular fluid dividing passage portion, pressing the joining surface of the molding member and the mold body main body with a predetermined pressure, while maintaining the pressed state, the molding member and the mold body main body, A direct current and / or pulse current is passed to temporarily join the joining surface of the molding member and the mold body, and the molding member and the mold body in the temporarily joined state are heat-treated at a predetermined ambient temperature. The fluid passage is provided between the molding member and the mold body. A mold apparatus being characterized in that form.

  A second aspect of the present invention is the mold apparatus according to the first aspect, wherein the molding member is formed by dividing a cavity forming member.

  According to a third aspect of the present invention, there is provided a mold apparatus manufacturing method including a pair of mold bodies that open and close each other to form a cavity between the mold bodies when the mold is closed, and the mold body is provided with a fluid passage. The molding member having a molding surface facing the cavity, the mold body fixed to the molding member and mounted on the molding machine side, and the joint surface between the molding member and the mold body are substantially semicircular. A divided fluid section having a substantially semicircular cross section, and forming the fluid separating passage in the molding member and the mold body, respectively, and then connecting the joining surface of the molding member and the mold body to a predetermined surface. While pressing with pressure, while maintaining this pressed state, a direct current and / or a pulse current is passed through the molding member and the mold body to temporarily join the joining surface of the molding member and the mold body, The molding member and the mold body in a temporarily joined state Body which is a manufacturing method of a mold apparatus, characterized in that the formation of the fluid passage between predetermined said moldable member was heat-treated at ambient temperature and type body.

  A fourth aspect of the present invention is the method of manufacturing a mold apparatus according to the third aspect, wherein the temporary joining is performed after the fluid dividing passage portion is polished.

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

  The invention of claim 6 is the method for manufacturing a mold apparatus according to any one of claims 3 to 5, wherein the heat treatment is performed in an inert atmosphere.

  Invention of Claim 7 is a manufacturing method of the metal mold | die apparatus of any one of Claims 3-6 which makes temperature of the said heat processing 55 to 85% of melting | fusing point of the member which should be joined. .

  According to the first aspect of the present invention, the area in the flow path of the liquid for cooling can be narrowed to increase the flow velocity to improve the heat exchange efficiency, and the fluid resistance can also be reduced by making the section substantially circular. In addition, no welding auxiliary material appears in the fluid passage, and the inner surface of the fluid passage can be kept smooth.

  According to invention of Claim 2, the cavity formation member which has a fluid channel | path can be formed simply.

  According to invention of Claim 3, it can join firmly, without using a welding auxiliary material at all, and also the whole surface of a joining surface can be joined uniformly. And since a welding auxiliary material is not used, a welding auxiliary material does not come out to a fluid passage, and the thing whose inner surface of a fluid passage is smooth is obtained.

  According to the invention of claim 4, even if temporary joining is performed after polishing, the welding auxiliary material is not used, so that the inner surface of the fluid passage can be kept smooth.

  According to invention of Claim 5, since the said pressure shall be 50 megapascals or less, the enlargement of the apparatus for pressurization is not caused.

  According to invention of Claim 6, since the said heat processing is performed in inert atmosphere, the quality of a joining location is stabilized.

  According to the seventh aspect of the present invention, the temperature of the heat treatment is set to a temperature range of 55% to 85% of the melting point of the members to be joined.

  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.

  The figure shows Example 1, in which 1 is a fixed mold, 2 is a movable mold, and the fixed mold 1 and the movable mold 2 which are mold bodies are moved in the vertical direction (mold opening / closing direction) shown in the drawing. A cavity 3 is formed between the two to open and close and to form an optical disk when the mold is closed.

  The fixed mold 1 includes a fixed mold 6 and a fixed mounting plate 7 fixed to the surface of the fixed mold 6 opposite to the movable mold 2. This fixed side mounting plate 7 is mounted on a fixed platen P1 of an injection molding machine (not shown). A sprue bush 8 to which a nozzle of an injection molding machine (not shown) is connected is fixed to the center portion of the fixed side mounting plate 7 by bolts 9. The sprue bushing 8 is a sprue 10 having a material passage inside, but penetrates the fixed side mounting plate 7 and protrudes toward the fixed side mold plate 6 side. Further, a locate ring 11 is fixed by a bolt 12 on the surface of the sprue bushing 8 opposite to the movable mold 2.

  The fixed-side template 6 is detachably fixed to the fixed-side mounting plate 7 by bolts 16 and has a cavity block 17 serving as a cavity forming member having a molding surface 17A side on which a later-described stamper 27 facing the cavity 3 abuts. It comprises a positioning ring 19 that is fitted on the outer peripheral side of the cavity block 17 and is fixed to the fixed side mounting plate 7 with bolts 18. The cavity block 17 forms the cavity 3. Further, a stepped portion 22 is formed on the outer peripheral portion of the cavity block 17 on the movable mold 2 side. An annular outer peripheral stamper presser 23 is fitted into the stepped portion 22 and fixed by a bolt 24. Has been. On the other hand, a substantially cylindrical inner stamper presser 26 is fitted and fixed in a through hole 25 formed in the central portion of the cavity block 17. A stamper 27 for transferring stored information to the optical disk is detachably mounted on the cavity block 17, but the outer peripheral stamper presser 23 presses the outer peripheral portion of the stamper 27, and the inner peripheral stamper presser 26 The inner periphery of the stamper 27 is pressed. The sprue bushing 8 is fitted in a cylindrical inner stamper presser 26. A recess 28 is formed on the front end surface of the sprue bushing 8 on the movable mold 2 side.

  In the cavity block 17, a fluid passage 31 that surrounds the cavity 3 and allows cooling liquid such as cooling water to pass therethrough is formed in a substantially spiral shape about the axis Z. Further, an inlet side fluid passage 32 communicating with the fluid passage 31 is formed in the fixed side mounting plate 7.

  Further, the cavity block 17 includes a molding member 33 having a molding surface 17A, a fixed platen P1, which is located on the opposite side of the cavity 3 from the molding member 33 and is integrally formed with the fixed-side mounting plate 7. A mold body 34 attached to the molding machine is provided, and both of the molding member 33 and the joining surfaces 33A and 34A of the mold body 34 have fluid split passage portions 35 each having a substantially half-circular cross section. , 36, and when these fluid dividing passage portions 35, 36 are matched, the cross section of the fluid passage 31 is formed in a substantially circular shape. The substantially circular shape includes an ellipse.

  Then, the joint surfaces 33A and 34A are processed into flat surfaces, preferably mirror surfaces. The joining surfaces 33A and 34A may be rough surfaces (surface roughness is about ▽ in JIS standard), but it is preferable to process into a mirror surface because the joining strength of the member is high and deformation due to joining can be reduced. The numerical range of the mirror surfaces on the joint surfaces 33A and 34A is not necessarily clear, but here refers to a surface processed state having a smoothness with a numerical value of Ra 0.3 or less (the smaller the numerical value, the higher the smoothness). In addition, the inner surfaces of the fluid dividing passage portions 35 and 36 are polished in advance to be smooth and finished.

  After the polishing is completed, the joining surfaces 33A and 34A are aligned with each other, and the molding member 33 and the mold body 34 are overlapped with each other using a known positioning means, and the molding member 33 and the mold body 34 are moved up and down. The laminated body 37 superposed on is attached to an energization joining apparatus T described later, and the joining surfaces 33A and 34A are joined.

  The movable mold 2 includes a movable mold 41, a movable receiving plate 42 fixed to a surface of the movable mold 41 opposite to the fixed mold 1, and a fixed mold 1 of the movable receiving plate 42. A movable side mounting plate 44 fixed by bolts 43 is provided on the opposite surface. The movable attachment plate 44 is attached to the movable platen P2 of the injection molding machine. The movable side mold plate 41 is fitted to the core block 46 as a cavity forming member having a molding surface 46A facing the cavity 3 fixed to the movable side receiving plate 42 by bolts 45, and the outer peripheral side of the core block 46. And a positioning ring 48 fixed to the movable side receiving plate 42 by a bolt 47. The core block 46 forms the cavity 3.

  Further, a stepped portion 51 is formed on the outer peripheral portion of the core block 46 on the fixed mold 1 side, and an annular outer peripheral ring 52 is slid within a predetermined range in the mold opening / closing direction. It is movably fitted. Reference numeral 53 denotes a bolt that prevents the outer ring 52 from coming off. The outer ring 52 is urged toward the fixed mold 1 by a spring 55. The outer peripheral ring 52 comes into contact with the outer peripheral stamper presser 23 on the fixed mold 1 side when the mold is closed.

  Further, as shown in FIG. 2, a substantially annular air blowing insert 62 is fitted into a recess 61 formed on the surface of the fixed block 1 at the center of the core block 46, and is fastened by a bolt 63. It is fixed. An air passage 64 formed in the core block 46 and the movable side receiving plate 42 communicates with the gap between the air blowing insert 62 and the inner peripheral surface of the recess 61.

  Further, a substantially cylindrical protruding sleeve 66 is fitted in the air blowing insert 62 so as to be slidable within a predetermined range in the mold opening / closing direction. The protruding sleeve 66 passes through the core block 46 and has one end located in the movable receiving plate 42. A slide bearing 67 is interposed between the protruding sleeve 66 and the movable receiving plate 42. Further, the protruding sleeve 66 is urged to the opposite side of the fixed mold 1 by a spring 68. Reference numeral 69 denotes a restricting plate fixed in the movable side receiving plate 42 in order to restrict the sliding range of the protruding sleeve 66.

  Further, a substantially cylindrical gate cut sleeve 71 is fitted in the protruding sleeve 66 so as to be slidable within a predetermined range in the mold opening / closing direction. The gate cut sleeve 71 passes through the protruding sleeve 66 and the regulating plate 69, but a slide bearing 72 is interposed between the gate cut sleeve 71 and the protruding sleeve 66. A flange 73 formed at one end of the gate cut sleeve 71 is located on the movable attachment plate 44 side with respect to the restriction plate 69. Further, the gate cut sleeve 71 is biased to the opposite side of the fixed mold 1 by a spring 74.

  In addition, a protruding plate 76 is supported on the movable side mounting plate 44 so as to be slidable within a predetermined range in the mold opening / closing direction. The protruding plate 76 is urged to the opposite side of the fixed mold 1 by a spring 77. An ejection pin 78 fixed to the ejection plate 76 is slidably fitted into the gate cut sleeve 71. Further, the interlocking pin 79 fixed to the protruding plate 76 penetrates the flange portion 73 of the gate cut sleeve 71 and the restricting plate 69 and hits the protruding sleeve 66. Further, a receiving portion 80 projecting from the flange portion 73 of the gate cut sleeve 71 penetrates the protruding plate 76 in a slidable manner.

  Further, in the core block 46, a fluid passage 81 for allowing a cooling liquid such as cooling water to pass therethrough is formed in a substantially spiral shape about the axis Z. Further, an inlet side fluid passage 82 communicating with the fluid passage 81 is formed in the movable side receiving plate 42.

  Further, the core block 46 includes a molding member 83 having a molding surface 46A, a movable platen integrated with the movable side mounting plate 44 located on the opposite side of the cavity 3 from the molding member 83, and thus molding. A mold body 84 to be attached to the machine, and both of the molding member 83 and the joint surfaces 83A and 84A of the mold body 84 have fluid dividing passages 85 each having a substantially half-circular cross section. 86. When the fluid dividing passages 85 and 86 are respectively matched, the cross section of the fluid passage 81 is formed in a substantially circular shape.

  Then, the joint surfaces 83A and 84A are processed into flat surfaces, preferably mirror surfaces. The joint surfaces 83A and 84A may be rough surfaces (surface roughness is about ▽ in JIS standard), but it is preferable to process the mirror surface because the joint strength of the member is high and deformation due to the joint can be reduced. The numerical range of the mirror surfaces at the joint surfaces 83A and 84A 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). Further, the inner surfaces of the fluid dividing passage portions 85 and 86 are polished in advance to make a smooth surface and finished.

  After the polishing is completed, the joining surfaces 83A and 84A are aligned with each other, and the molding member 83 and the mold body main body 84 are vertically stacked using a known positioning means or the like, and the molding member 83 and the mold body main body 84 are moved up and down. The laminated body 87 superposed on is attached to an energization joining device T described later, and the joining surfaces 33A and 34A are joined.

  Then, the gate that allows the sprue 10 on the fixed die 1 side to communicate with the cavity 3 between the outer peripheral portion on the tip end surface of the sprue bush 8 on the fixed die 1 side and the outer peripheral portion on the tip end surface of the gate cut sleeve 71 on the movable die 2 side. 88 is to be formed. Further, when the gate cut sleeve 71 is fitted into the recess 28 of the sprue bushing 8, the resin as the molding material in the sprue 10 and the resin in the cavity 3, that is, the optical disk are cut at the gate 88, and the central part of the optical disk is cut. The opening hole is formed. Therefore, in the fixed mold 1, an optical disc is formed by the inner peripheral stamper presser 26 and the outer peripheral portion of the front end surface of the sprue bushing 8 in addition to the cavity block 17. In the movable mold 2, an optical disk is formed by the air blowing insert 62 and the protruding sleeve 66 in addition to the core block 46 and the outer peripheral ring 52.

  FIG. 3 shows the overall configuration of the current-carrying apparatus of this example. As shown in this figure, the energization joining apparatus T of this example includes an energization joining machine 90 and a heat treatment machine 100. The energization bonding machine 90 is disposed above the base 92 and the lower energizing electrode 93 that is electrically insulated from the base 92 and fixed on the base 92 by a known method via an insulating member. A fluid pressure cylinder 94 supported on the base 92 by a known method, and fixed to the tip of the piston rod 95 of the fluid pressure cylinder 94 by being electrically insulated from the piston rod 95 by a known method via an insulating member. An upper energizing electrode 96 is provided.

  The fluid pressure cylinder 94 functions as a pressurizing device that presses the material to be joined. As the pressurizing device, the upper energizing electrode 96 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 93 and 96 are electrically connected to a power supply device 97, and the power supply device 97 can supply a DC pulse current. The power supply of the power supply device 97 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 96 is movable, but conversely, the lower energizing electrode 93 can be movable, or both can be moved.

  Next, the heat treatment machine 100 is configured to include a vacuum heat treatment furnace having a known structure. It should be noted that the current-carrying machine 90 and the heat treatment machine 100 can be integrated into an apparatus configuration, or these can be moved. Of course, these may be arranged separately.

  Next, a procedure for mutually joining the molding member 33 and the mold body 34 constituting the laminated body 37 using the current-carrying joining apparatus T having this structure will be described.

  First, the laminate 37 is sandwiched between the energizing electrodes 93 and 96, the fluid pressure cylinder 97 is driven, and the upper energizing electrode 96 is lowered by the piston rod 95. As a result, the laminated body 37S is sandwiched between the energizing electrodes 93 and 96 and is pressed with a predetermined pressing force. A predetermined pressing force is applied between the molding member 33 and the joint surfaces 33A and 34A of the mold body 34. 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 33A and 34A 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 direct current of a predetermined value is passed through the laminated body 37, or when both a direct current and a pulse current are passed simultaneously, a state where the joint surfaces 33A and 34A are joined to each other can be formed. confirmed.

  The state in which the respective joint surfaces 33A and 34A are joined in this manner is not yet complete from the viewpoint of joint strength. Therefore, this bonded state is referred to as a temporary bonded state, and the laminate 37 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 100. 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 bonding between the bonded surfaces 33A and 34A in the temporarily bonded state becomes perfect and becomes a complete bonded body. That is, the cavity block 17 in which the bonding strength between the bonding surfaces 33A and 34A is equal 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.

  Through the heat treatment described above, the cavity block 17 having the fluid passage 31 having a substantially circular cross section is obtained. In the cavity block 17, a fluid passage 31 is formed between the joining surfaces 33A and 34A by joining the molding member 33 and the mold body 34. Therefore, it can manufacture easily compared with the case where it manufactures by the conventional cutting. In other words, the grooves forming the fluid dividing passage portions 35 and 36 having a substantially half-circular cross section may be formed on the joint surfaces 33A and 34A by grinding or the like. It is also easy to give a mirror finish to the inner surface. Moreover, since it is possible to join without using any welding auxiliary material, the welding auxiliary material does not come out in the material passage 21 after joining, and the inner surfaces of the fluid dividing passage portions 35 and 36 having a substantially half-circular cross section are smoothed. Can keep.

  In addition, according to the method of this example, the bonding strength between the molding member 33 and the mold body 34 can be made as strong as the strength of the base material, and no problem occurs.

Further, the mirror finishing of the inner surfaces of the fluid dividing passage portions 35 and 36 can be performed very simply because it is performed before the molding member 33 and the mold body 34 are joined.
The core block 46 is manufactured in the same manner.

  Next, the operation of the above configuration will be described. The mold is closed with the fixed mold 1 attached to the fixed platen and the movable mold 2 attached to the movable platen. In this state, the outer peripheral ring 52 of the movable mold 2 abuts on the outer peripheral stamper presser 23 of the fixed mold 1 in the closed state. Then, a molten thermoplastic resin, which is a thermoplastic molding material, is injected from the nozzle of the injection molding machine to the sprue 10. This resin flows from the sprue 10 through the gate 88 into the cavity 3. When resin is injected into the cavity 3 from the gate 88 opened at the center of the cavity 3, the resin spreads radially from the gate 88, that is, from the center of the cavity 3 to the outer periphery, and the outer periphery of the cavity 3. Finally, the resin reaches the part.

  Then, after the cavity 3 is filled with the resin, the receiving portion 80 of the gate cut sleeve 71 is pushed toward the fixed mold 1 by a pressing rod (not shown) provided on the injection molding machine side, whereby the gate cut is performed. The sleeve 71 moves to the fixed mold 1 side and fits into the recess 28 of the sprue bush 8 of the fixed mold 1. As a result, the resin in the sprue 10 and the resin in the cavity 3, that is, the optical disk are cut at the gate 88. Further, by increasing the clamping force of the fixed mold 1 and the movable mold 2, almost the entire movable mold 2 including the core block 46 moves toward the fixed mold 1 and the resin in the cavity 3 is compressed. . Thereby, the stored information corresponding to the unevenness of the stamper 27 is reliably transferred to the optical disc.

  Further, the resin in the cavity 3 is cooled and solidified to form an optical disk. Note that the coolant flows into the substantially spiral fluid passage 31 via the inlet-side fluid passage 32 and exchanges heat with the cavity block 17 to lower the temperature of the cavity block 17. Further, the liquid is drained from an outlet (not shown). At this time, since the cross section of the fluid passage 31 is substantially circular and the flow passage area is narrow, the flow velocity is faster than that of a conventional groove-like flow passage area and heat exchange is performed. Efficiency can be improved.

  Similarly, the cooling liquid flows into the substantially spiral fluid passage 81 through the fluid passage 81 and exchanges heat with the core block 46 to lower the temperature of the core block 46. Further, the fluid is drained from an outlet (not shown). At this time, since the cross section of the fluid passage 81 is substantially circular, the flow passage area is formed narrow, so that the flow velocity is increased and the heat exchange efficiency can be improved.

  After forming the optical disk in this way, the fixed mold 1 and the movable mold 2 are opened. With this mold opening, the molded optical disk and the resin solidified in the sprue 10 are first separated from the fixed mold 1. Next, when the ejection plate 76 is pushed toward the fixed mold 1 by a not-shown pressing rod provided on the injection molding machine side, the ejection pin 78 moves to the fixed mold 1 side together with the ejection plate 76, and the sprue 10 The resin solidified inside is protruded and released from the movable mold 2. Further, when pushed by the interlocking pin 79 fixed to the ejecting plate 76, the ejecting sleeve 66 moves to the fixed mold 1 side, and the inner peripheral portion of the optical disk is ejected to be released from the movable mold 2. At the time of mold release, the air supplied from the air passage 64 is blown out from the gap between the air blow-in insert 62 and the core block 46, whereby the vacuum break between the optical disc and the movable mold 2 is performed. Then, the released optical disk is taken out by a take-out robot (not shown). For example, in the case of a DVD, two optical disks are bonded together by an adhesive.

  As described above, in the embodiment, the fluid dividing passage portions 35, 36, 85, 86 having a substantially half-circular cross section are provided, and when the fluid dividing passage portions 35, 36, 85, 86 are matched, the fluid passages 31, 81 are provided. Since the cross section is formed in a substantially circular shape, the area of the coolant flow path can be narrowed to increase the flow velocity and improve the heat exchange efficiency, and the fluid resistance can also be reduced by making the cross section substantially circular. it can. In addition, the molding members 33 and 83 and the mold bodies 34 and 84 can be joined without using a welding auxiliary material, and the entire joining surfaces 33A, 34A, 83A and 84A can be joined uniformly. Since no welding auxiliary material is used in this way, no welding auxiliary material appears in the fluid passages 31 and 81, and the inner surfaces of the fluid passages 31 and 81 can be kept smooth.

  Further, since the cavity block 17 and the core block 46 are divided into two parts, the inner surfaces of the fluid dividing passage parts 35, 36, 85, 86 can be easily polished in the divided state, and the fluid dividing passage part 35 is obtained. , 36, 85, 86 by molding members 33, 83, and mold body bodies 34, 84, so that the cavity block 17 and the core block 46 having fluid passages 31, 81 with smooth inner surfaces can be simplified. Can be formed.

  Further, in the manufacturing method, fluid passages 31, 81 are formed between the molding members 33, 83 and the mold bodies 34, 84, and the joining surfaces 33A, 34A, 83A, 84A are pressed at a predetermined pressure, and this pressed state is obtained. While holding, a direct current and / or a pulse current is passed through the molding members 33 and 83 and the mold bodies 34 and 84 to join the molding surfaces 33A and 34A, 83A and 84A are temporarily joined, and the molding members 33 and 83 and the mold bodies 34 and 84 in the temporarily joined state are heat-treated at a predetermined atmospheric temperature, so that they can be joined without using any welding auxiliary material. The members 33, 83 and the mold bodies 34, 84 can be firmly bonded, and the entire surfaces of the bonding surfaces 33A, 34A, 83A, 84A can be bonded uniformly. Since no welding auxiliary material is used, the welding auxiliary material does not come out in the fluid passages 31 and 81 of the cavity block 17 and the core block 46, and a smooth inner surface of the fluid passages 31 and 81 is obtained.

  In addition, since the fluid dividing passage portions 35, 36, 85, and 86 are ground and then temporarily joined, even if temporarily joined after grinding, no welding auxiliary material is used, so the inner surfaces of the fluid passages 31 and 81 are smoothed. Can be kept in.

  Moreover, since the said pressure shall be 50 megapascals or less, the enlargement of the apparatus for pressurization is not caused.

  In addition, since the heat treatment is performed in an inert atmosphere, the quality of the joint portion is stabilized.

  Moreover, since the temperature of the heat treatment is set to a temperature range of 55% to 85% of the melting point of the members to be joined, it is preferable from the viewpoint of heat treatment, and a good joining state can be obtained.

  As described above, in addition to the optical disk according to the present invention, it can be applied to uses such as relatively thin products.

It is sectional drawing which shows Example 1 of this invention. It is sectional drawing around the cavity 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 of the fluid passage by the side of the cavity block which shows Example 1 of this invention. It is sectional drawing of the fluid passage by the side of the core block which shows Example 1 of this invention.

Explanation of symbols

3 cavity
17 Cavity block (mold)
17A molding surface
31 Fluid passage
33 Molding parts
33A, 34A joint surface
34 body
35, 36 Fluid dividing passage
46 Core block
46A molding surface
81 Fluid passage
83 Molding parts
83A, 84A joint surface
84 body
85, 86 Fluid dividing passage

Claims (7)

  In a mold apparatus comprising a pair of mold bodies that open and close each other to form a cavity between the mold bodies when closed, and in which a fluid passage is provided in the mold body, the mold body has a molding surface facing the cavity. A fluid dividing member having a substantially semicircular cross section obtained by dividing a substantially circular shape into both a member, a mold body fixed to the molding member and mounted on the molding machine side, and a joining surface between the molding member and the mold body body; A passage portion, pressing a joint surface between the molding member and the mold body with a predetermined pressure, and holding the pressed state, a direct current and / or a pulse current is applied to the molding member and the mold body. The molding member and the mold body are temporarily joined to each other, and the molding member and the mold body in the temporarily joined state are heat-treated at a predetermined atmospheric temperature to form the molding member and the mold body. The fluid passage is formed between the main bodies. Mold apparatus for.   2. The mold apparatus according to claim 1, wherein the molding member is formed by dividing a cavity forming member.   In a method of manufacturing a mold apparatus having a pair of mold bodies that open and close to each other and form a cavity between the mold bodies when the mold is closed, the mold body has a molding surface facing the cavity. A molding member having a mold, a mold body fixed to the molding member and mounted on the molding machine side, and a substantially circular half-section of the joint surface between the molding member and the mold body. And forming the fluid dividing passages in the molding member and the mold body, respectively, and then pressing the joining surface of the molding member and the mold body with a predetermined pressure. While maintaining the state, a direct current and / or a pulse current is passed through the molding member and the mold body to temporarily join the joining surfaces of the molding member and the mold body, and the temporarily joined state. Predetermined atmosphere between molding member and mold body Production process of the mold apparatus, characterized in that the formation of the fluid path between said shaping member was heat-treated at every mold body.   4. The method of manufacturing a mold apparatus according to claim 3, wherein the temporary joining is performed after the fluid dividing passage portion is polished.   The method for manufacturing a mold apparatus according to claim 3 or 4, wherein the pressure is 50 megapascals or less.   The method for manufacturing a mold apparatus according to claim 3, wherein the heat treatment is performed in an inert atmosphere.   The method for manufacturing a mold apparatus 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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