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61. 发明专利

JPS5831292B2 失效
公开(公告)号：JPS5831292B2
公开(公告)日：1983-07-05
申请号：JP11466678
申请日：1978-09-20
申请人： HITACHI LTD
发明人： KANEDA AIZO , OOTSUKI KEIZO , SHIMIZU TAKESHI , AOKI MASAYOSHI
IPC分类号： B29C45/00 , B29B13/00 , B29C33/00 , B29C33/10 , B29C33/38 , B29C43/00 , B29C43/02 , B29C43/32 , B29C43/36 , B29C43/38 , B29C45/02 , B29C45/26

62. 发明专利

JPS56164830A MOLD FOR SANDWICH STRUCTURE BODY 失效
公开(公告)号：JPS56164830A
公开(公告)日：1981-12-18
申请号：JP6888980
申请日：1980-05-26
申请人： HITACHI LTD
发明人： GOTOU MASAO , NAKAMURA SHIYOUZOU , KOUYA KENICHI , YOKONO ATARU , AOKI MASAYOSHI , SHIBATA KATSUO , NAKA REIJI
IPC分类号： B32B5/18 , B29B7/00 , B29B13/00 , B29C33/00 , B29C33/02 , B29C33/04 , B29C39/00 , B29C39/12 , B29C39/26 , B29C39/38 , B29C44/04 , B29C45/73
摘要： PURPOSE:To produce a skin layer having a desired thickness at a desired part of a molded article and thereby enhance the strength of the molded body by a method wherein a mold body forming a mold cavity is provided with a cooling hole for passing a coolant therethrough at a part of the mold body corresponding to the part of the article to be enhanced in strength. CONSTITUTION:The cooling hole 7 is provided at a corner part 5b of an upper mold 5A having holes 8 for temperature regulation in the proximity of the mold cavity 4. Two kinds of stock solutions are poured into the cavity 4 formed by the upper mold 5A and a lower mold 6. Before the stock solutions are solidified through reacting with each other to form the sandwich structure body 1A, the coolant cooled to a temperature of -5-+10 deg.C is circulated through the cooling hole 7 to cool the stock solution in the proximity to the hole 7, thereby producing the skin layer 2b having a high density and the desired thickness.

63. 发明专利

JPS56146741A SETTING OF HOLDING TIME AND SYSTEM THEREFOR 失效
公开(公告)号：JPS56146741A
公开(公告)日：1981-11-14
申请号：JP5040680
申请日：1980-04-18
申请人： HITACHI LTD
发明人： YOSHII MASAKI , SATOU HIDEMI , KANEDA AIZOU , AOKI MASAYOSHI , YOKONO ATARU , OKA MITSUNORI
IPC分类号： B29C45/57 , B29C37/00 , B29C45/00 , B29C45/77
摘要： PURPOSE:To set the holding time property and automatically upon injection molding by a method wherein pressure holding is released when the detected value of the pressure in a cavity reaches zero value or a gate seal point is detected. CONSTITUTION:The pressure in the cavity 5 is detected by a pressure sensor 7 through a pressure detecting pin 6 and this pressure signal 8 is differentiated by time in a differentiator 9, then is inputted into a micro computor 11 through an A/D convertor 10. In the micro computor 11, a hold cutting signal is sent to a hold cutter 12 when an instance (the gate seal point D) at which said differentiated value is varied abruptly three times after the initiation of the injecting at every shot thereof is detected and the holding is released by it. It is more sure that two sets of the differentiator are provided in series and the pressure signal 8 in the cavity is differentiated once more to detect the gate seal point D as a pulse.

64. 发明专利

JPS56136342A MOLD FOR VACUUM OPERATION 失效
公开(公告)号：JPS56136342A
公开(公告)日：1981-10-24
申请号：JP3896180
申请日：1980-03-28
申请人： HITACHI LTD
发明人： SATOU HIDEMI , YOSHII MASAKI , KANEDA AIZOU , AOKI MASAYOSHI , YOKONO ATARU
IPC分类号： B29C45/00 , B29B13/00 , B29C33/00 , B29C33/10 , B29C33/72 , B29C41/00 , B29C45/34
摘要： PURPOSE:To obtain the mold capable of drawing a vacuum in a cavity and producing a molded article devoid of burrs by a method wherein a vent passage having one end opened into the cavity and the other communicated with a vacuum source is provided along the parting line of the mold. CONSTITUTION:The vent passage 12 is provided along the parting line 15 at which the mold is split after molding. One end of the passage 12 is opened into the interior of the cavity 10, while the other is communicated with the vacuum source 13. When the passage 12 is angularly shaped in cross section, the width (a), the thickness (b) and the length (l) thereof are preferably about 5mm., about 0.05mm. and about 5mm. respectively. When the passage 12 has such sizes, no burr is generated on the molded article.

65. 发明专利

JPS5684938A METHOD AND SYSTEM FOR CONTROLLING MOLDING OF THERMOSETTING RESIN 失效
公开(公告)号：JPS5684938A
公开(公告)日：1981-07-10
申请号：JP16163179
申请日：1979-12-14
申请人： HITACHI LTD
发明人： YOSHII MASAKI , SATOU HIDEMI , AOKI MASAYOSHI
IPC分类号： B29C45/00 , B29C43/00 , B29C45/02 , B29C45/50 , B29C45/76 , B29C45/77 , H01L21/56
摘要： PURPOSE:To manufacture an injection molded form without any fin and an irregularity in weight thereof by a method wherein a microcomputer is utilized to control the molding by detecting a propagating pressure and the maximum expansion pressure in a cavity. CONSTITUTION:A time for finishing a filling, a time for hardening a gate, the propagating pressure that means a cavity pressure corresponding to an injection pressure, the maximum expansion pressure that means the maximum pressure due to expansion of the resin in the cavity 26, the maximum time of duration of the expansion pressure and a cycle time of the molding are set in the microcomputer 11, thereafter, the molding is begun by operating a hydraulic pump 8. The internal pressure of the cavity is detected by a pressure sensor 28 after the time for finishing the filling and when this pressure is higher than the propagation pressure, a servo valve 14 is operated to increase a cylinder pressure and the both pressures are equalized. The maximum expansion pressure in the cavity, at the time when the gate hardening time is elapsed and the expansion pressure has become maximum, is compared with the set value and if the difference thereof is within an allowable range, the molded article itself is assumed to be a finished article and the molding work is finished when the time of molding cycle is over.

66. 发明专利

JPS5678928A HIGH FREQUENCY PREHEATING MACHINE 失效
公开(公告)号：JPS5678928A
公开(公告)日：1981-06-29
申请号：JP15639579
申请日：1979-12-04
申请人： HITACHI LTD
发明人： SAEKI JIYUNICHI , KANEDA AIZOU , TSUZUKI SUSUMU , AOKI MASAYOSHI
IPC分类号： H05B6/50 , B29B9/00 , B29B13/00 , B29B13/08 , B29C35/08
摘要： PURPOSE:To detect the hardness of a tablet accurately by a method wherein a weight is suspended from a lever of a press roller to press the tablet and the heating condition of the tablet is detected by the movement of the lever. CONSTITUTION:The tablet 1 is placed on a lower roller electrode 2 and, moreover, the tablet press roller 3 is placed on the tablet 1 and the tablet 1 is pressed under a predetermined pressure by the force of the weight 13. Then, if the high frequency preheating is initiated, the lower roller electrode 2 starts the rotation toward a direction shown by an arrow and the tablet 1 and the tablet press roller 3 are rotated to a direction shown by an arrow. If the preheating is advanced and the tablet 1 is softened, the tablet press roller 3 is pressed into the tablet 1 and a contact 9 is closed to complete the preheating. As described above, the hardness of the tablet is detected accurately and the preheating condition of the tablet can be made constant.

67. 发明专利

JPS5675814A METAL MOLD FOR SHAPING FORM IN PLASTIC 失效
公开(公告)号：JPS5675814A
公开(公告)日：1981-06-23
申请号：JP15250079
申请日：1979-11-27
申请人： HITACHI LTD
发明人： EBINUMA NAOTAKE , KANEDA AIZOU , AOKI MASAYOSHI
IPC分类号： B29B13/00 , B29C33/00 , B29C33/10 , B29C33/44
摘要： PURPOSE:To prevent changes in dimensions and damage caused to a shaped material when detaching it from a metal mold and effectuate high quality and yield rate by incorporating an air ejector chip in the metal sleeve of a metal mold. CONSTITUTION:An air ejector chip 3 is incorporated with a metal mold heretofore in use in a position where a projected pin passes through the mold. The upper surface of the chip is leveled with that of the cavity surface 13a of a lower mold 8A, while its lower surface is opened to an air passageway 9 made in the mold 8A, so that the chip pierces the lower mold. If pressurized air is sent through the passageway 9 from the outside, it reaches the interface between a shaped material 7 and a cavity 13 (that is, the cavity surface 13a) via the air-circulating passageway 4 of the air ejector chip 3. The air pressure is used to detach the shaped material 7 from the cavity surface 13a. Since the pressurized air is applied to the whole surface of the shaped material 7 touching the cavity, the external force is reduced. Thus, changes in dimensions and shape do not occur because excessive stress is not added to the shaped material 7.

68. 发明专利

JPS5666791A LIQUID CRYSTAL DISPLAY ELECTRONIC TYPE DIGITAL TIMEPIECE 失效
公开(公告)号：JPS5666791A
公开(公告)日：1981-06-05
申请号：JP14132179
申请日：1979-11-02
申请人： HITACHI LTD
发明人： IIDA MAKOTO , GOTOU MASAO , AOKI MASAYOSHI , ANCHI TAKAHIKO
IPC分类号： G04G9/06 , G04G17/02 , G04G99/00
摘要： PURPOSE:To decrease the number of parts, by forming the resin block body provided with the parts accomodating channel with a definite material and fastening said body and fitting board by a definite tapping screw and then, fixing the liquid crystal display element. CONSTITUTION:A resin block body 3 provided with the channel accomodating the electronic parts such as a liquid crystal display element 12, a crystal oscillator 5, a battery 10 etc., is made polyburylene terephthalate containing glass fiber or polycarbonate and each clamping destruction torque by a screw, return torque or maintaining force becomes larger. Accordingly, the element 12 is surely fixed by fastening the fitting board 13 and the body 3 by using M1.4-0.8 tapping screws 8.... By such a construction needless of screw clap tool, numbers of parts are decreased and construction is carried out rapidly and easily.

69. 发明专利

JPS55139235A CORE PIN COOLING METHOD 失效
公开(公告)号：JPS55139235A
公开(公告)日：1980-10-30
申请号：JP4600779
申请日：1979-04-17
申请人： HITACHI LTD
发明人： AOKI MASAYOSHI , YOSHII MASAKI , HAYAKAWA TETSUO , NAKATANI SHIYUUICHI
IPC分类号： B29C45/00 , B29B13/00 , B29C33/00 , B29C33/02 , B29C33/76 , B29C41/00 , B29C45/26 , B29C45/37 , B29C45/73
摘要： PURPOSE:To prevent the generation of molding sink caused by thermal shrinkage of a cylindrical hollow molded product by a method wherein a perforation is provided for the core pin of the plastic molding die, cooling by flowing the coolant within the perforation thereof. CONSTITUTION:A melted resin is running through a runner 8A, and a gate 9A to fill in the cavity 12A for manufacturing a cylindrical hollow molded product. In this case, perforation 13 is provided for a core pin 11A, the coolant such as air being supplied to the perforation 13 by passing through air inlet 15, and pipe 14, and cooling constantly the core pin 11A during molding by discharging from the air flow way 16 and air outlet 17. Since the core pin 11A is constantly cooled during molding, the internal diameter surface of the molded product may not generate a molding sink without developing thermal shrinkage.

70. 发明专利

JPS5582624A REACTION TYPE INJECTION MOLDING DIE 失效
公开(公告)号：JPS5582624A
公开(公告)日：1980-06-21
申请号：JP15574378
申请日：1978-12-19
申请人： HITACHI LTD
发明人： NAKAMURA SHIYOUZOU , GOTOU MASAO , AOKI MASAYOSHI
IPC分类号： B29C45/00 , B29B13/00 , B29C33/00 , B29C33/10 , B29C41/00 , B29C45/34 , B29C67/24
摘要： PURPOSE:To prevent a molding surface from formation of voids or non-charged part by providing small-diameter holes for air vent in a upper or lower mold. CONSTITUTION:Several small-diameter holes 7 for air vent are provided in a section of the bottom surface of the lower mold 2 where gas or air is likely to stagnate. The hole diameter is about 1-2mm, but since the fluidity of the material depends on the viscosity of the material, foaming conditions, discharge pressure and other factors, it is desirable to change the hole diameter according to the material used and other elements. Each hole is provided with a sufficient draft to keep it free from being stuffed with the material. In order to facilitate drilling of the holes 7, a thin- walled portion 8 is provided at the section of the bottom surface of the lower mold 2 where the holes 7 are provided. According to this arrangement, gas and air are discharged out even if the material is reacted and solidified at a high speed, so that there is no possibility of producing voids or non-charged area in the molding surface.

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