Unlock instant, AI-driven research and patent intelligence for your innovation.

Casting, vertical casting method and vertical casting apparatus

a vertical casting and casting head technology, applied in the field of nonferrous metals, can solve the problems of reducing the yield, affecting the quality of castings, and the method may have an internal defect of the casting head cavity

Inactive Publication Date: 2002-12-05
DAIDO STEEL CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, castings that are obtained from the steels by the vertical casting method suffer the occurrence of multiple internal defects, such as the center porosity and center segregation or V-shaped segregation, thus degrading the quality of the castings and lowering the yield.
In addition, the conventional vertical casting method may have an internal defect of a casting head cavity occurring in a casting.
In other words, the conventional vertical casting method could not produce castings that could sufficiently meet such a present strict demand on the quality of castings as required of special steels including high-alloy steel and tool steel.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Casting, vertical casting method and vertical casting apparatus
  • Casting, vertical casting method and vertical casting apparatus
  • Casting, vertical casting method and vertical casting apparatus

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0037] (Operation of First Embodiment)

[0038] A description will now be given of the operation of the vertical casting method that is executed by the vertical casting apparatus according to the first embodiment. The winch 56 is rotated in a predetermined direction to move up the lift table 50. With the bottom portion of the mold 12 closed with the dummy head 48, molten steel of a special steel including a high-alloy steel and tool steel is poured in the mold 12 via the ladle 16 and the tundish 18. The molten steel poured in the mold 12 is subjected to first cooling in the mold 12, thus forming a shell on the surface of the molten steel. As the winch 56 is rotated in the reverse direction to vertically move down the lift table 50 at a given casting speed, the casting 26 whose bottom end is supported by the dummy head 48 is pulled out from the bottom portion of the mold 12.

[0039] The casting 26 immediately after being pulled out from the mold 12 is held by the guide rolls 44, 44 from b...

example 1

[0046] In case of casting a casting whose TOP portion has a thickness of 600 mm and a width of 750 mm using a special steel including a high-alloy steel and tool steel as a material, the results of measuring the center segregation of C and the coagulation front side angle .theta. for a case where no tapering is given and the casting speed (Vc) is variable (indicated by .circle-solid.) and a case where tapering is given and the casting speed (Vc) is variable (indicated by .tangle-solidup.) are shown in FIG. 6. The casting was provided with a tapering of 4 mm / m.

[0047] As apparent from FIG. 6, it was confirmed that tapering a casting could suppress the segregation of C. It was also confirmed that even in case where no tapering was given, setting the casting speed slower could suppress the segregation of C in the center of the casting and could increase the coagulation front side angle .theta.. It was shown that tapering in addition to the lowering of the casting speed could further sup...

second embodiment

[0057] (Operation of Second Embodiment)

[0058] A description will now be given of the operation of the vertical casting method that is executed by the vertical casting apparatus according to the second embodiment. The winch 56 is rotated in a predetermined direction to move up the lift table 50. With the bottom portion of the mold 120 closed with the dummy head 48, molten steel of a special steel including a high-alloy steel and tool steel is poured in the mold 120 via the ladle 16 and the tundish 180. The molten steel poured in the mold 120 is subjected to first cooling in the mold 120, thus forming a shell on the surface of the molten steel. As the winch 56 is rotated in the reverse direction to vertically move down the lift table 50 at a given casting speed, the casting 220 whose bottom end is supported by the dummy head 48 is pulled out from the bottom portion of the mold 120.

[0059] The casting 220 immediately after being pulled out from the mold 120 is held by the guide rolls 44...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Speedaaaaaaaaaa
Lengthaaaaaaaaaa
Sizeaaaaaaaaaa
Login to View More

Abstract

A molten steel of a special steel or the like including a high-alloy steel is poured in a mold whose bottom portion is closed with a dummy head of a lift table. As the lift table is vertically moved down at a given casting speed, a casting whose lower end is supported by the dummy head is continuously pulled out from the bottom portion of the mold. As a pair of movable molds that constitute the mold are relatively moved away from each other in synchronism with the downward movement of the lift table, both widthwise side surfaces of the casting are provided with required tapering.

Description

[0001] The present invention relates to a casting of a predetermined length, which is acquired by vertically pulling out a casting that has been cooled down in a mold so as to have only its surface portion coagulated (or a shell formed on the surface), and a vertical casting method and a vertical casting apparatus which cast the casting.DESCRIPTION OF THE RELATED ART[0002] In the field of nonferrous metals, such as aluminum, a vertical casting method is known that casts a casting of a predetermined length by pouring molten steel in a mold, which is open to the top and bottom, supporting the lower end of a casting, which has been cooled down in the mold so as to have a shell formed on the surface, on a dummy head of a lift table provided below the mold in a movable manner and vertically pulling out the casting from the bottom portion of the mold by vertically moving the lift table downward at a given speed.[0003] Because the vertical casting method is advantageous over the ingot-maki...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22D7/00B22D11/12
CPCB22D7/00B22D11/1213B22D11/1206
Inventor TAKAHASHI, HAJIMEAMANO, HAJIMEKUMURA, SOICHIRO
Owner DAIDO STEEL CO LTD