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1. 发明专利

JPH04100700A DEVICE FOR REJECTING DEFECTIVE IN REPRESSING PRESS 失效
公开(公告)号：JPH04100700A
公开(公告)日：1992-04-02
申请号：JP21541990
申请日：1990-08-15
申请人： YOSHITSUKA SEIKI KK , NISSAN MOTOR
发明人： KATAGIRI TAKESHI , KOSUGI HIDEAKI , KISHI YUJI
IPC分类号： B21D43/00 , B21J13/08 , B30B15/28
摘要： PURPOSE:To surely and quickly reject a defective work by arranging a means for automatically rejecting the defective work based on a defective detected signal by a defective detecting means and further, providing a control means for automatically returning the press back to operating condition after rejecting the defective work. CONSTITUTION:When the work 200 is defective, such as positional abnormality, wrong side out and two pieces at once, the defective is detected by the defective detecting means and the operation of press is stopped. Successively, the defective work is pushed out of the press by a rejecting means such a pushing-off cylinder 18, etc., and thereafter the operation of press is automatically restarted by a control means. Further, by rejecting the work from a rejecting hole 20 opened at the lower side of a supplying table 1, the rejection of work is surely and quickly executed. Further, by arranging a supporting member 30 for supporting the work in the rejecting hole, there is no fear of rejecting a normal work by mistake. By this method, rejection of the defective work is executed with no-operator and the working ratio can be improved.

2. 发明专利

JPH0639596A METHOD AND APPARATUS FOR PRODUCTION OF POWDER MOLDED PARTS HAVING UNDERCUT PART 失效
公开(公告)号：JPH0639596A
公开(公告)日：1994-02-15
申请号：JP21955092
申请日：1992-07-28
申请人： YOSHITSUKA SEIKI KK , NISSAN MOTOR
发明人： KISHI YUJI , KATAGIRI TAKESHI
IPC分类号： B22F3/02 , B22F5/00 , B22F5/10 , B28B3/02 , B30B11/00 , B30B11/02 , B30B15/02
摘要： PURPOSE:To enable the direct molding of undercut parts in powder molding by dividing dies to a plurality providing cam dies corresponding to the shapes of the undercut part between parting planes and constituting the cam dies in such a manner that the dies can advance and retreat to and from die holes. CONSTITUTION:Powder 7 is put into the die holes 1A, 2A, 3A of the upper and lower dies 1, 2 and the cam dies 3 from a feeder 6 and the amt. of packing is increased more than the regulated amt. to make an overfeed state. The feeder 6 is thereafter retrated and the upper fist and upper second punches 41, 42 and a pressing punch 43 are lowered to form the packed state. The transfer of the packed powder is executed in order to attain the packing depth proportional to the height of the products and the pressurization is executed by proportional molding. The upper and lower punches 4, 5 are retreated or relatively retreated upon completion of the pressurization and the die pressing punch 43 and the upper die 1 are risen by allowing the residual pressure to remain to some extent. The lower die 2 as well as the lower first punch 51 and the core 53 are lowered to complete withdrawal. The products are ejected by product ejector rods 8 right thereafter.

3. 发明专利

JPH06246497A CROSS HOLE MOLDING METHOD FOR POWDER MOLDED GOODS AND ITS METALLIC MOLD DEVICE 失效
公开(公告)号：JPH06246497A
公开(公告)日：1994-09-06
申请号：JP14834293
申请日：1993-05-28
申请人： NISSAN MOTOR , YOSHITSUKA SEIKI KK
发明人： KISHI YUJI , KATAGIRI TAKESHI
IPC分类号： B22F3/02 , B22F3/03 , B22F3/035 , B22F5/00 , B22F5/10 , B30B11/00 , B30B11/02
摘要： PURPOSE:To easily and inexpensively produce powder molded goods molded with cross holes. CONSTITUTION:The powder molded goods 8 molded with the cross hole 8 are produced by providing metallic molds for forming a mold space 5 in which material powder 4 is packed with a horizontal rod 6 which is formed to the outside diameter equal to the bore of the cross hole 8a to be bored and is horizontally insertable and retractable into and out of the mold space 5 through at least one of dies 1, pressurizing the material powder 4 at an equal compression ratio by means of upper and lower punches 3, 2 around the horizontal rod 6 in the state of inserting the horizontal rod 6 into the mold space 5 and pulling off the horizontal rod 6 after completion of the pressurization. A large- diameter guide part is formed adjacently to the molding part of the horizontal rod 6 for boring the cross hole 8a by inserting the rod into the mold space 5 of the metallic mold device and the die 1 existing on the advance side of the horizontal rod 6 is provided with a guide hole into which the guide part is slidably inserted in a close fitting state.

4. 发明专利

JPH09239597A POWDER MOLDING PRESS 失效
公开(公告)号：JPH09239597A
公开(公告)日：1997-09-16
申请号：JP8095896
申请日：1996-03-08
申请人： YOSHITSUKA SEIKI KK
发明人： KATAGIRI TAKESHI
IPC分类号： B30B15/18 , B30B11/02 , B30B15/20
摘要： PROBLEM TO BE SOLVED: To prevent cracks due to transfer of powders by controlling liquid cylinders at such a velocity that the ratio of the dimension of a power part pressed with a movable punch and an opposing punch to the dimension of the powder part pressed with an upper ram equals to the ratio of the dimension of a corresponding product. SOLUTION: The velocity of the upper 1 cylinder 31 and lower 1 cylinder 41 is controlled based on the velocity previously set in a controller in correspondence to the position of the upper ram 102 so that the ratio of the dimension of the powder part between the upper 1 punch 11 and lower 1 punch 12 to the dimension of the powder part between the upper 2 punch 12 and lower 2 punch 22 pressed corresponding to the stroke of the upper ram 102 equals approximately to the ratio of the dimension of the corresponding part of a final mold product all over pressing processes. By this way, a control valve controlling based on the set velocity is provided with, the powder part is approximately pressed at the same ratio, whereby cracks due to transfer of powders and defective mold are largely reduced.

5. 发明专利

JPH0825077B2 失效
公开(公告)号：JPH0825077B2
公开(公告)日：1996-03-13
申请号：JP41538090
申请日：1990-12-28
申请人： YOSHITSUKA SEIKI KK
发明人： KATAGIRI TAKESHI , YAMAMOTO MASAO , SHIRASAKI SHIRO
IPC分类号： B30B11/00 , B29C31/00 , B30B15/02

6. 发明专利

JPH06106398A POWDER MOLDING PRESS 失效
公开(公告)号：JPH06106398A
公开(公告)日：1994-04-19
申请号：JP27673592
申请日：1992-09-22
申请人： YOSHITSUKA SEIKI KK
发明人： KATAGIRI TAKESHI , SHIRASAKI SHIRO , YAMAMOTO MASAO
IPC分类号： B30B11/00 , B30B15/02
摘要： PURPOSE:To provide the powder molding press which facilitates the attachment and detachment of a die set to be mounted between the upper ram and lower ram of a press body and improves the accuracy of molded articles. CONSTITUTION:The upper part within the lower ram 4 into and from which a yoke plate 2 of a die set 1 is inserted and removed is provided with a gap adjusting screw 16 to be screwed down in a vertical direction. A fluid actuator 23 and other rotation driving means are mounted to the lower part of the lower ram 4. A driving shaft 24 of the rotational driving means is connected to the tap adjusting screw 16 by a connecting shaft 19 penetrating the axial center of the lower ram 4. The gap adjusting screw 16 is retreated into the lower ram 4 to assure a sufficient gap between the yoke plate 2 and the lower ram 4 at the time of mounting the die set 1 to the press body A. After the die set 1 is inserted into the yoke plate 2, the gap adjusting screw 16 is advanced and is abutted to the yoke plate 2, by which the die set is fixed in the state of the nearly zero gap not free from a play.

7. 发明专利

JPH0457639A POSITIONING DEVICE FOR WORKPIECE 失效
公开(公告)号：JPH0457639A
公开(公告)日：1992-02-25
申请号：JP16562390
申请日：1990-06-26
申请人： YOSHITSUKA SEIKI KK
发明人： KATAGIRI TAKESHI , SHIRASAKI SHIRO
IPC分类号： B23Q3/18 , B21D43/00 , B21J13/10 , B22F3/24 , B30B11/08
摘要： PURPOSE:To prevent the upper surface part of a workpiece from being damaged by freely fitting a positioning pin and a key part into the center part of a workpiece and projecting the key part and fitting the key into a keyway at the center, in a device for positioning the workpiece by an intermittent feeding device. CONSTITUTION:When a workpiece W is shifted to positioning position by the intermittent turn of a turntable 1, the positioning pin 16 of an attachment 12 installed on a centering adapter 8 is freely fitted in the center hole Wa of the workpiece W, together with a key 17. Further, when the centering adapter 8 lowers, and the top edge of the pin part 31 of the positioning pin 16 contacts the upper surface of a table T, a position pin block 36 is pushed up against an urging spring 21. Accordingly, a gap is generated between the lower edge of an alarm 34 and the flange 30 of a clamp ring 15, and the key 17 is put into waiting the spring-out state from an assembled recessed part 32. At this time, if the centering adapter 8 is turned in a prescribed direction, key part 35 is fitted with the keyway Wb of the center hole Wa, and the key 17 turns in the counterclockwise direction, and fitted with the keyway Wb.

8. 发明专利

JPH0357599A LINEAR FEEDING FEEDER OF PRESS EQUIPMENT 失效
公开(公告)号：JPH0357599A
公开(公告)日：1991-03-12
申请号：JP19117989
申请日：1989-07-24
申请人： YOSHITSUKA SEIKI KK
发明人： YAMAMOTO MASAO , SHIRASAKI SHIRO , TAJIMA TSUKASA , KATAGIRI TAKESHI
IPC分类号： B21D43/05 , B22F3/24 , B30B11/00 , B30B13/00
摘要： PURPOSE:To miniaturize a transfer device for a formed part and to execute the transfer at a high speed by gripping the formed part by a clamp member and transferring successively the formed part. CONSTITUTION:A rotation axis 5 rotates by 180 deg., and turns an axis center Pa of a guide roller 6. Accordingly, when the axis center Pa of the guide roller 6 is deviated to the inside, feed bars 1, 2 are pressed in the clamp direction, and when it is deviated to the outside, the feed bars 1, 2 are opened to the clamp direction. The feed bars 1, 2 are constituted so as to be freely slidable on a guide bar 8 by a retainer 7, and always pressed to the outside by a spring provided peripherally on the guide bar 8. Also, since a track of the axis center Pa draws a semicircular track, an advance/retreat speed which the axis anter Pa of the guide roller 6 has against the feed bars 1, 2 becomes maximum at the time of rotation of 90 deg., and becomes minimum at the time of rotation of 180 deg.. Accordingly, at the time of clamp or unclamp, jigs 3, 4 move forward and backward slowly against a formed part, and move forward and backward at a high speed on the way thereof.

9. 发明专利

JPH0356605A DEVICE FOR TAKING OUT GREEN COMPACT IN SIZING PRESS 失效
公开(公告)号：JPH0356605A
公开(公告)日：1991-03-12
申请号：JP19117889
申请日：1989-07-24
申请人： YOSHITSUKA SEIKI KK
发明人： YAMAMOTO MASAO , SHIRASAKI SHIRO , TAJIMA TSUKASA , KATAGIRI TAKESHI
IPC分类号： B30B13/00 , B22F3/24 , B30B11/00
摘要： PURPOSE:To execute sure takeout of a green compact without opening a lower punch by arranging means for holding correcting finish green compact taken out with a lower punch from die hole for correction. CONSTITUTION:The green compact S is pressurized into the die hole H for correction with the upper and lower punches 5, 10 to execute sizing. An upper punch plate 4 is driven upward, and by ascending a lower plate, too, a first takeout i.e. the correcting finish green compact S positioned on the lower punch 10 is pushed up on a die plate 2, is executed. At the time of working a fluid cylinder 30 in a pressing mechanism 22, a clamper 21 is shifted to the arrow mark A direction according with sending-out of a feed bar 31. Pusher rollers 28a are run onto inclining part 27a in a pusher 27, and only during running in the distance L, the green compact S is pressed. This pressed force is transferred to a jig 23, and the jig 23 holds the green compact S as inserting. As the holding reaction force loaded from the green compact S to the clamper 21 is received with the pressing mechanism 22, the force acting to the feed bar 31 is reduced.

10. 发明专利

JPS6253280B2 失效
公开(公告)号：JPS6253280B2
公开(公告)日：1987-11-10
申请号：JP18542780
申请日：1980-12-29
申请人： YOSHITSUKA SEIKI KK
发明人： KATAGIRI TAKESHI , OOZU MASAAKI
IPC分类号： B30B11/00 , B30B15/02

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