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71. 发明专利

JPH10137841A WALL INCREASING DEVICE FOR METAL BAR 失效
公开(公告)号：JPH10137841A
公开(公告)日：1998-05-26
申请号：JP30726596
申请日：1996-11-01
申请人： DAI ICHI HIGH FREQUENCY CO LTD
发明人： KISHIHARA SHIGEKI , KITAYAMA NOBUYOSHI
IPC分类号： B21C37/16 , B21C37/00 , B21J5/08 , C21D1/34 , C21D9/08
摘要： PROBLEM TO BE SOLVED: To provide the wall increasing device capable of executing wall increasing in the optional position for the metal bar having different lengths. SOLUTION: In this device, a first guiding device 12A and a second guiding device 12B holding the metal bars 1 in the axial direction so as to be movable are arranged holding the induction heating coil 20 locally heating the metal bar 1 for wall increasing, further a first carriage 31 mounted a first compressing force applying head 33 and a hydraulic pusher 34 and a second carriage 32 mounted a second compressing force applying head 36 are arranged in the both sides, the first carriage 31 and the second carriage 32 are stopped at the position suitable to the length and the wall increasing position of the metal bar set passing through the induction heating coil, the compressing force applying heads 33, 36 are engaged with the both ends of the metal bar, and the wall increasing is executed by applying the compressing force with the hydraulic pusher 34.

72. 发明专利

JPH10118729A CORE DEVICE FOR ANGULAR TUBE BODY 失效
公开(公告)号：JPH10118729A
公开(公告)日：1998-05-12
申请号：JP29733296
申请日：1996-10-18
申请人： DAI ICHI HIGH FREQUENCY CO LTD
发明人： ITOU YASUYUKI , MOCHIZUKI OSAMU , MIYAGAWA TADANOBU
IPC分类号： B21D39/20 , B21J5/08 , C21D1/00 , C21D9/08
摘要： PROBLEM TO BE SOLVED: To easily insert/extract a core positioning within a tube body and regulating the inner surface into/from the angular tube body in the case of heating the angular tube body. SOLUTION: Four die segments 6 provided with a die surface 6a capable of regulating one corner part of the angular tube body 2 and its adjacent flat surface are arranged so as to encircle the center axial line O-O and moreover so that the corner part of respective die surfaces 6a corresponds to the corner part of the tube body, thereby constituting the core 3. Plural inclined surfaces 6b inclined with a given angle are formed in the inner surface of respective die segments 6 and supported with the inclined supporting surface 15a of plural guide supporting members 15 held with a driving rod 12, the guide supporting members 15 are reciprocated in the axial direction with respect to die segments 6 with a hydraulic cylinder 13, whereby, four die segments 6 are moved in the radial direction and the core 3 is expanded and contracted.

73. 发明专利

JPH1043881A BRAZING METHOD FOR PLANAR BODY 失效
公开(公告)号：JPH1043881A
公开(公告)日：1998-02-17
申请号：JP21594696
申请日：1996-07-30
申请人： DAI ICHI HIGH FREQUENCY CO LTD
发明人： TANIGUCHI YASUYUKI , KOBAYASHI RYOJI , KURIBAYASHI MASAKI
IPC分类号： B23K31/02 , B23K33/00
摘要： PROBLEM TO BE SOLVED: To provide a brazing method capable of minimizing a shearing stress caused in a brazing filler metal layer after cooling, in brazing two planar bodies having a different thermal expansion coefficient. SOLUTION: Two planar bodies 3, 8 having a different coefficient are laminated through a molten filter metal layer, which is then solidified to braze the planar bodies together; in this case, the filter metal between the planar bodies is solidified with at least one of the two operations added, one of which is to temporarily reduce the brazing area of the planar body 3 having a larger thermal expansion coefficient, and the other of which is to temporarily enlarge that of the planar body 8 having a smaller coefficient; consequently, a shearing stress is minimized that is caused in the filler metal layer after cooling on account of the difference between the thermal expansion coefficients of the two planar bodies 3, 8.

74. 发明专利

JPH103984A HIGH-FREQUENCY POWER SUPPLY UNIT 失效
公开(公告)号：JPH103984A
公开(公告)日：1998-01-06
申请号：JP17167896
申请日：1996-06-12
申请人： DAI ICHI HIGH FREQUENCY CO LTD
发明人： HIRAYAMA KOTARO , MORISHITA YOSHIYUKI
IPC分类号： H05B6/06
摘要： PROBLEM TO BE SOLVED: To prevent a trouble caused by the damping of an output current by arranging a PDM type output power adjusting mechanism and an oscillation action maintaining mechanism temporarily storing the data on the periodic behavior of the output current and oscillating in response to the damping of the output current. SOLUTION: Voltage and current signals are inputted to a switching circuit 1 converting the DC power into the high-frequency AC power from a control circuit 5 via signal terminals 3a, 3b. A PDM type output power adjusting mechanism 8 increasing/decreasing the implementation frequency rate via the intermittent switching action of an inverse transformation section and an oscillation action maintaining mechanism 9 are arranged on the control circuit 5 in addition to a PLL mechanism 6 and a dead time adjusting mechanism 7. The frequency of the output current detected by a current detector 4 is stored in a microcomputer 17, and an oscillator 18 is oscillated based on it. When the output current is damped to the prescribed level or below, the oscillation signal of the oscillator 18 is inputted to the PLL mechanism 6 in place of the immediate signal from the current detector 4, and the oscillation of the feedback signal is not stopped.

75. 发明专利

JPH09302416A HEAT TREATMENT OF METALLIC BAR STOCK 失效
公开(公告)号：JPH09302416A
公开(公告)日：1997-11-25
申请号：JP14098696
申请日：1996-05-10
申请人： DAI ICHI HIGH FREQUENCY CO LTD
发明人： MINAGAWA TSUGIO , YAIRO KEISUKE
IPC分类号： B21D7/00 , B21F1/00 , C21D1/42 , C21D9/00
摘要： PROBLEM TO BE SOLVED: To provide a method for executing a heat treatment so that a metallic bar stock having thin part and thick part becomes uniform mechanical characteristics. SOLUTION: In the method for executing the heat treatment, a heating means 2 for partially heating a small range in the metallic bar stock 1 and a cooling means 4 for cooling by injecting cooling medium 3 at the rear part of the heated part 5, are shifted along the metallic bar stock 1. The heat treatment conditions applied to the metallic bar stock 1 with the heating means 2 and the cooling means 4 (shifting speed of the heating means 2 and the cooling means 4, cooling calory with the cooling means 4 or heating temp. with the heating means 2, etc.), are changed with the thin part 1a and the thick part 1c to execute the heat treatment so that the thin part 1a and the thick part 1c become almost uniform mechanical characteristics (hardness, tensile strength, elongation).

76. 发明专利

JPH09287026A METHOD FOR HOT TREATMENT OF METAL BAR MATERIAL AND COOLING DEVICE 失效
公开(公告)号：JPH09287026A
公开(公告)日：1997-11-04
申请号：JP12260996
申请日：1996-04-19
申请人： DAI ICHI HIGH FREQUENCY CO LTD
发明人： MINAGAWA TSUGIO , YAIRO KEISUKE
IPC分类号： C21D9/00 , C21D9/08
摘要： PROBLEM TO BE SOLVED: To execute hot treatment without generating curvature in a metal BAR material by biasing the quantity of cooling media to be jetted on a metal bar material by a cooling device to vertical direction. SOLUTION: A cooling device 10 is arranged so as to surround a metal bar material 1 (e.g. a square pipe), the inside has a passage 11a for cooling media, and the side face is provided with a cooling media jetting member 11 in which many jetting pores 11b are formed. The passage 11a is divided into the sections of the upper and lower, left and right and each corner part by partitions 12 provided at the inside, and each section is respectively connected with a cooling medium feed tube 14 provided with a flow rate regulating valve 13. Thus, by regulating the valve 13, the jetting quantity from each section can optionally be changed. At the time of heat treatment, the jetting quantity of the cooling medium is set to be small to the upper face of the metal bar material 1, to be medium to the side face and to be large to the lower face. In such a way, the cooling rate for the bar material 1 is uniformized in the peripheral direction of the bar material 1 to prevent the generation of curvature of the bar material 1.

77. 发明专利

JPH09176760A PRODUCTION OF ALUMINA-ALUMINUM COMPOSITE BODY 失效
公开(公告)号：JPH09176760A
公开(公告)日：1997-07-08
申请号：JP34942395
申请日：1995-12-22
申请人： DAI ICHI HIGH FREQUENCY CO LTD , FUKUSHIMA MASAATSU
发明人： FUKUSHIMA MASAATSU
IPC分类号： C22C1/10
摘要： PROBLEM TO BE SOLVED: To provide a method tar producing an alumina-aluminum composite body without constraining the alloying specification of metallic phases. SOLUTION: Heating is executed in such a manner that aluminum is brought into contact with the porous body of oxide powder with a communicative hole structure in a nonoxidizing atmosphere to melt the aluminum, then, by capilarity, the molten aluminum is infiltrated into the porous body, and thermit reaction is continuously allowed to occur in the contact face between the molten aluminum and porous body to form and grow alumina.

78. 发明专利

JPH09143550A METHOD FOR HEATING INNER SURFACE OF HOLE 失效
公开(公告)号：JPH09143550A
公开(公告)日：1997-06-03
申请号：JP32989295
申请日：1995-11-24
申请人： DAI ICHI HIGH FREQUENCY CO LTD
发明人： MORISHITA YOSHIYUKI , MATSUOKA TOSHIHARU , MAENOZONO TSUKASA , TANIGUCHI YASUYUKI
IPC分类号： C21D1/10 , C21D1/42 , C21D9/00
摘要： PROBLEM TO BE SOLVED: To provide a method of uniformly heating the inner surface of a hole without reducing the heating efficiency in the induction heating of the inner surface of the hole. SOLUTION: In the induction heating method, the inner peripheral surface and the bottom surface of the bottomed hole arranged in a metallic member 1 is subjected to induction heating, plural hair-pin state coils 5, 5' are arranged in the holes. These coils are integrally rotated within the range of 180 deg. around the center line of the hole or electric current is supplied to the coils while changing over the bearing to uniformly raise the temp. of the inner peripheral surfaces and the bottom surfaces of the holes.

79. 发明专利

JPH0976011A METHOD FOR HEAT TREATMENT FOR THICKENING WORK OF METALLIC TUBE AND DEVICE THEREFOR 失效
公开(公告)号：JPH0976011A
公开(公告)日：1997-03-25
申请号：JP25729095
申请日：1995-09-11
申请人： DAIWA HOUSE IND , DAI ICHI HIGH FREQUENCY CO LTD
发明人： WATANABE YASUO , NAGANO TOSHIO , MINAGAWA TSUGIO , FUKUDA AKIRA
IPC分类号： B21C37/16 , B21J1/06 , B21J5/08 , B21K21/16
摘要： PROBLEM TO BE SOLVED: To prevent deformation generated n the cross section of thick part formed at the time of executing local thickening work and heat treatment to a metallic tube such as a square tube. SOLUTION: By preliminarily setting a die 10 for heat treatment in the square tube 1 to be thickened, forming a heated part 5 by locally heating the square tube with a heating device 4 under the state where compressive force is added to the square tube 1 with a compressing device 3 and moving the heated part 5 in the longitudinal direction to the square tube, thick part 1A thickened is continuously formed, the heated part 26 for heat treatment is formed by heating the thick part 1A with an auxiliary heating device 9 and heat treatment of the whole thick part is executed by moving the heated part 26 for heat treatment in the longitudinal direction of the thick part. At the time of these thickening work and heat treatment, deformation on the verge of generating in the thick part 1A is prevented with the die 10 for heat treatment which is set inside the square tube 1 and the thick part 1A having a good cross-sectional shape is formed.

80. 发明专利

JPH08323427A BENDING METHOD FOR METAL TUBE 失效
公开(公告)号：JPH08323427A
公开(公告)日：1996-12-10
申请号：JP15409395
申请日：1995-05-30
申请人： DAI ICHI HIGH FREQUENCY CO LTD
发明人： WATANABE YASUO , HIRAYAMA KOTARO , YOSHITOME TAKAHIRO
IPC分类号： B21D7/025 , B21D7/16
摘要： PURPOSE: To eliminate cutting after bending or trial bending before actual working by detecting the deviation between a tube stock length during the bending and the planed value and adding the control operation for adjusting the thickness of a deformation progressing part in the direction to reduce the deviation. CONSTITUTION: A turning angle θ of an arm 2 and an actual travel quantity of a tube 1 sent in for turning of the angle θ, that is, a length of a straight tube sent in are measured, in order to generate the actual travel quantity and the turning angle θ, the deviation to a planned value of the travel quantity L set beforehand based on the equation: L=R.θ(1+ρ) is operated, a thickness of the bending part is adjusted so as to reduce the deviation. (in equation, R is a bending radius, ρ is a compression rate). That is, in normal bending, by advancing or retreating a guide pieces 4 in the longitudinal direction of the tube 1 and by controlling a compression rate, the tube length of a tube stock sent in for forming the bent part of the prescribed bent angle is controlled so as to be the planned length.

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