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1. 发明专利

JPH0260422B2 失效
公开(公告)号：JPH0260422B2
公开(公告)日：1990-12-17
申请号：JP17333386
申请日：1986-07-22
申请人： KUBOTA LTD
发明人： TAKEUCHI KATSUYUKI , TOSHIMA TOSHIO , SUDO YUTAKA
IPC分类号： B22D11/00 , B22D11/04 , B22D11/055

2. 发明专利

JPH02175053A UPWARD CONTINUOUS CASTING APPARATUS 失效
公开(公告)号：JPH02175053A
公开(公告)日：1990-07-06
申请号：JP33052688
申请日：1988-12-26
申请人： KUBOTA LTD
发明人： TAKEUCHI KATSUYUKI , TOSHIMA TOSHIO
IPC分类号： B22D11/04 , B22D11/059
摘要： PURPOSE:To produce structure having no cementite under as-cast condition by arranging a slow cooling part with slow cooling speed at upper range in inner cylinder of a mold. CONSTITUTION:Solidified shell 11 is developed at lower part in the inner cylinder 3 of the mold and as drawing up this, the solidified shell is grown in the inner face to form the prescribed metal pipe 12 in order. Then, as molten metal 10 is rapidly cooled at the lower range 3a in the inner cylinder 3 of the mold, the cementite is crystalized. However, as the slow cooling part with slow cooling speed is arranged at the upper range 3b in the inner cylinder 3 of the mold, at the time of reaching to the slow cooling part 3, cooling effect comes to small with water cooled mold 1 and also by heat of molten metal 10 at inside of the pipe 12, the pipe is heated. Therefore, the temp. just after solidifying ia held and the cementite is decomposed for short time, and as this is slowly cooled after that, the structure having no cementite under ascast condition, is obtd.

3. 发明专利

JPS6333150A CONTINUOUS CASTING METHOD FOR HOLLOW METALLIC PIPE 失效
公开(公告)号：JPS6333150A
公开(公告)日：1988-02-12
申请号：JP17710786
申请日：1986-07-28
申请人： KUBOTA LTD
发明人： TAKEUCHI KATSUYUKI , TOSHIMA TOSHIO , SUDO YUTAKA
IPC分类号： B22D11/00 , B22D11/04
摘要： PURPOSE:To prevent the holding of a core and to cast a pipe to a uniform wall thickness by disposing the core into a casting hole part of a casting mold, finely oscillating the core in the axial central direction of the hole part and drawing the cast pipe solidified and formed in the hole part. CONSTITUTION:Air A is passed through a communicating hole 19 from a supply hole 16 and is supplied into a hollow part 11 and a lower cylinder chamber 14b so that a piston part 10 and the core 5 are raised by the air pressure and the energizing force of a spring 15. The air pressure in the hollow part 11 and the lower cylinder chamber 14b is then released to the outside through a communicating hole 21 and a discharge hole 18, and the air B is supplied through a supply hole 17 and a communicating hole 20 into an upper cylinder chamber 14a. The piston part 10 and the core 5 are lowered by the pressure of the air B in the upper cylinder chamber 14a. The cast pipe 8 solidified and formed in the hole part 4 of the casting mold 1 is drawn by pinch rollers 9 while the core 5 is held finely oscillated vertically by repeating the above- mentioned action. The generation of a thickness deviation in the casting pipe 8 is prevented at this time, and the molten metal surface in contact with the core 5 is activated by the oscillation, by which the solidification is suppressed.

4. 发明专利

JPS6330164A DETECTING METHOD FOR CASTING DEFECT IN CONTINUOUS CASTING 失效
公开(公告)号：JPS6330164A
公开(公告)日：1988-02-08
申请号：JP17333586
申请日：1986-07-22
申请人： KUBOTA LTD
发明人： TAKEUCHI KATSUYUKI , TOSHIMA TOSHIO , SUDO YUTAKA
IPC分类号： B22D11/00 , B22D11/16
摘要： PURPOSE:To detect the casting defect under hot state just after casting by non-destructive test by detecting the casting defect from uneven temp. on the casting pipe surface. CONSTITUTION:The casting pipe 1 surface just after casting is photographed by an industrial television camera 2. The casting defect part in the casting pipe 1 is shown locally as bright color caused by high temp. and the surrounded sound part is shown as dark color. This picture is transferred into the CPU 4 and an picture processing for binarized image is executed. The processed image information is transferred into a monitor 5, to be regenerated as the processed image.

5. 发明专利

JPS5791869A PRODUCTION OF SPHEROIDAL GRAPHITE CAST IRON 失效
公开(公告)号：JPS5791869A
公开(公告)日：1982-06-08
申请号：JP16714380
申请日：1980-11-26
申请人： KUBOTA LTD
发明人： TOGAWA SUSUMU , TANI TOSHIO , KUROTOBI MANABU , TOSHIMA TOSHIO
IPC分类号： B22D1/00 , B22D13/02 , B22D27/06 , B22D27/20
摘要： PURPOSE:To eliminate the occurrence of bending and elliptical shaping of a cast iron pipe by including Mg powder and cryolite powder in Fe-Si type or Ca-Si type powder to be sprayed on the inside surfaces of dies in die casting of a spheroidal graphite cast iron. CONSTITUTION:Fe-Si alloy powder or Ca-Si alloy powder mixed with 2-5% Mg powder and 2-5% cryolite powder is sprayed on the inside surfaces of dies, and a cat iron steel is cast. here, the Mg stirs the molten metal by its explosive reaction, and decreases the inoculation irregularities owing to the irregular spraying of a dry coating material. Whether the spraying is sure or not is discriminated exactly by the fumes of the Mg, and further the Mg per se has a graphitization effect, and improves and inoculation effect. On the other hand, the cryolite improves the penetration of the dry coating material, and slags by reacting with the residues of its dissolution, thereby preventing dross formation. If the Mg is below 2%, the effect is insufficient and above 5%, the sound cast iron pipe is not obtained, the graphitization effect is lost, and the tendency toward formation of white pig iron is intensified. If the cryolite is below 2%, there is no intended effect, and above 5%, it is included in the molten metal and will be the cause for defects.

6. 发明专利

JPH01197656A DISCRIMINATING METHOD FOR MATRIX STRUCTURE 失效
公开(公告)号：JPH01197656A
公开(公告)日：1989-08-09
申请号：JP2425288
申请日：1988-02-03
申请人： KUBOTA LTD
发明人： TAKEUCHI KATSUYUKI , TOSHIMA TOSHIO
IPC分类号： G01N13/00 , G01N33/20
摘要： PURPOSE:To decide the structure which constitutes a base without reference to contrast and light and shade by sectioning the surface of the base to be tested and obtaining an objective picture to be discriminated, and dividing the objective picture into picture elements. CONSTITUTION:The surface of the base of a tube 1 is polished by an automatic polishing device 2 and then etched by an etching device 3. Then an image of the surface of the polished and etched matrix is picked up by a television camera 4 and recorded in an image memory 5 as the picture to be discriminated. At this time, the picture is divided in the memory 5 into picture elements, whose light-shade gradations are recorded as density values which are set in plural stages. A CPU 6 measures difference values of density of the respective picture elements over the entire picture, the measured difference values are summed up by density values on a large density side among the compared picture elements, and the sum value is divided by the number of picture elements by the density values and used as the frequency of each density value to form a histogram. Thus, the structure is decided without reference to the contrast and light and shade.

7. 发明专利

JPH01197011A APPARATUS FOR MEASURING OUTER DIAMETER OF PIPE AND STRAIGHTENING BEND 失效
公开(公告)号：JPH01197011A
公开(公告)日：1989-08-08
申请号：JP2336388
申请日：1988-02-02
申请人： KUBOTA LTD
发明人： TAKEUCHI KATSUYUKI , TOSHIMA TOSHIO , FUNAHASHI MITSURU
IPC分类号： B21D3/10 , B21D3/14
摘要： PURPOSE:To reduce cost of installation of the measuring and straightening apparatus by providing the pipe rotating device, disposing a sensor part capable of moving up and down and its scaling part and performing measuring the outer diameter and straightening the bend. CONSTITUTION:A pair of rotating devices 15 to hold an object pipe 1 horizontally and to rotate around the shaft center are disposed on the front and rear in the shaft center direction. Then, a laser projecting part 5 and receiving part 6 screwed to a pair of supporting shafts 3, 4 respectively to be enabled moving up and down are provided and driven by a driving device 7. The pipe 1 is set to the rotating device 15, the outer diameter of the pipe 1 is measured at plural positions by a sensor part driving device 9 and optical axes 8a, 8b of both sensor parts 8, and the outer diameter, out-of-roundness, straightness are computed by a control device 16. Further, a hydraulic ram 12 is moved to straighten the bend of the pipe 1 through a truck 14. By this method, the apparatus for measuring the outer diameter and straightening the bend of the pipe 1 is integrated and each size becomes common to reduce the cost of installation.

8. 发明专利

JPS6333152A FORMING METHOD FOR HOLLOW METALLIC TUBE 失效
公开(公告)号：JPS6333152A
公开(公告)日：1988-02-12
申请号：JP17710986
申请日：1986-07-28
申请人： KUBOTA LTD
发明人： TAKEUCHI KATSUYUKI , TOSHIMA TOSHIO , SUDO YUTAKA
IPC分类号： B21C37/15 , B22D11/00 , B22D11/04 , B22D11/128
摘要： PURPOSE:To form the sectional shape of cast tube into the optional shape by drawing the cast tube at hot state drawn from a mold toward the axial center of tube, while pressurizing by rollers from plural radius direction of tube. CONSTITUTION:The cast tube 5 formed as solidifying by the hollow part 4 of mold 1 is continuously drawn by pinch rollers 6. And at the same time of passing through an outer shape measuring instrument 7, the outer shape of peripheral part in the tube section is measured. Next, the measuring value is transmitted to the computing element 9 and is operated and the commanded signal is transmitted to each forming roller 8, to form into the prescribed shape at a first stage, and the forming rollers 8 press the cast tube 5 at the necessary pressurized force. And, the cast tube 5 is drawn toward the axial center direction of tube as pressing by the forming roller 8, to form the shape at the first stage. Next, the outer shape of cast tube 5 is measured by an outer shape measuring instrument 10 and the measured value is treated by a computing element 12, and then each forming roller 11 presses the cast tube 5 by the necessary pressurized force. And, the cast tube 5 is drawn as pressing by the forming roller 11, to correct to the true circle. Further, it is formed into elliptical, rectangular sectional shape, etc.

9. 发明专利

JPS6330149A CONTROL METHOD FOR PIPE THICKNESS IN CONTINUOUS CASTING FOR PIPE 失效
公开(公告)号：JPS6330149A
公开(公告)日：1988-02-08
申请号：JP17333486
申请日：1986-07-22
申请人： KUBOTA LTD
发明人： TAKEUCHI KATSUYUKI , TOSHIMA TOSHIO , SUDO YUTAKA
IPC分类号： B22D11/00 , B22D11/04 , B22D11/14 , B22D11/18
摘要： PURPOSE:To control pipe thickness for a cast pipe by adjusting molten surface level based on the pipe thickness for the cast pipe and molten metal temp. CONSTITUTION:The pipe thickness for the cast pipe 6 is measured by temp. difference of cooling water at between an inlet and an outlet of water cooling jacket 7. And, an image photographed by an industrial television camera 15 is processed based on a difference of this brightness, and the boundary part between a wall face of mold 5 and the molten metal, that is, molten surface level is detected. Further, the molten metal temp. is detected by thermocouple 13. Then, the developing velocity of solidified shell 6a is presumed from the pipe thickness and the molten metal temp. measured, and the forming time of solidified shell 6a till the solidified shell is developed to the aimed pipe thickness is calculated. A lifter 3 and screw feeding device 4 are worked to adjust the molten surface level, and while drawing the cast pipe 6, the pipe thickness is again measured to control the pipe thickness.

10. 发明专利

JPS5789423A HEAT TREATMENT OF SPHERICAL GRAPHITE CAST IRON PIPE 失效
公开(公告)号：JPS5789423A
公开(公告)日：1982-06-03
申请号：JP16714280
申请日：1980-11-26
申请人： KUBOTA LTD
发明人： TOGAWA SUSUMU , TANI TOSHIO , KUROTOBI MANABU , TOSHIMA TOSHIO
IPC分类号： C21D5/00 , C21D9/08
摘要： PURPOSE:To generate a desired ferrite structure without the needs for separate ferrite heat treatment by a method in which a spherical graphite cast iron pipe containing a specific amount of Si is molded and then subjected to a heat treatment involving heating and cooling under specific conditions. CONSTITUTION:A spherical graphite cast iron pipe containing 2.3-2.8% Si is cast by a casting method, removed from the casting mold as it is in high-temperature state, cooled to 700-750 deg.C, right below the transformation point Ar1, and then charged into a heat treatment furnace, where the pipe is heated to about 850 deg.C, right above the transformation point Ac1 to convert its pearlite structure into austenite. Then, the pipe is gradually cooled at 700-650 deg.C at a cooling rate of about 10 deg.C (+ or -2.5 deg.C)/min or less and then air-cooled. Thus, the retention time of the pipe at a maximum holding temperature of 850 deg.C can be greatly shortened.

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