Multi-piece piston for a cold chamber casting machine

A multi-piece, casting machine technology, applied in the field of multi-piece pistons, can solve the problems of impossibility to eliminate sticking and sticking, easy to wear, etc., and achieve the effect of simplifying structure and manufacturing, and facilitating cooling

Active Publication Date: 2008-10-15
EXCO TECHNOLOGIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been shown that the screw connection between piston cover and piston body is subject to wear during casting operations and it is not possible to rule out jamming and sticking

Method used

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  • Multi-piece piston for a cold chamber casting machine
  • Multi-piece piston for a cold chamber casting machine
  • Multi-piece piston for a cold chamber casting machine

Examples

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Effect test

Embodiment Construction

[0042] figure 1 and 2 A cap-shaped piston 1 cooled in a manner to be explained in more detail below is shown for a cold-chamber casting machine for metals, for example aluminum alloys. Piston 1 includes a piston carrier 3 which itself forms the end region of a piston rod indicated at 5 and is screwed, for example, to the piston rod. The piston 1 is moved in a manner known per se in the casting cylinder indicated by 7 of the cold chamber casting machine, driven by means of the piston rod 5 .

[0043] Piston 1 is multi-part and includes a piston cover 9 which, on the high-pressure side of piston 1 , forms a piston end wall 13 which rests in one face on an axis-perpendicular end face 11 of piston carrier 3 . Towards the low-pressure side, a piston body 15 in the form of a sleeve adjoins the piston cover 9 on the overlapping end face 11 . It is radially centered on the high-pressure side on an annular shoulder 17 of the piston cover 9 and on the low-pressure side on an annular ...

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PUM

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Abstract

A multi-piece piston (1) is disclosed, for fixing to the high pressure side end (3) of a piston rod (5) running axially in a casting cylinder (7) of a cold chamber casting machine. The piston comprises a piston crown (9) forming a piston front face (13) on the high pressure side and a piston body (15) in the form of a bush connected to the piston crown (9) on the low pressure side. The piston body (15) can be connected to the piston crown (9) by means of fixing screws (23) to form a module. Complementary bayonet looking means (25, 27) are provided, for axial fixing of the piston (1) to the end (3) of the piston rod (5), on the piston crown (9) and the end (3).

Description

technical field [0001] The invention relates to a multi-part piston for fastening to the high-pressure-side end region of a piston rod which is axially displaceable in a casting cylinder of a cold chamber casting machine. Background technique [0002] The normally cooled pistons of cold chamber casting machines are subject to high wear in operation. The replacement of pistons or piston wear parts is borne by the productivity of the casting machine. The replacement of worn pistons takes a long time and often requires special tools, especially since the parts of the piston and piston rod jam or stick during operation and can often only be separated by force. [0003] In order to facilitate the replacement of the piston, it is known from US Pat. No. 5,233,912 A to fasten the generally cap-shaped piston axially by means of a bayonet connection with play on the piston support, which also cools the piston with a cooling fluid. The bayonet connection facilitates piston replacemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/20
CPCB22D17/203B22D17/2038B22D17/08B22D17/20
Inventor A·米勒F·米勒
Owner EXCO TECHNOLOGIES LTD
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