Semisolid Casting of Metallic Parts and Structures

Today, tool life in high pressure die casting (HPDC) is of growing interest. A common agreement is that die life is primarily decided by the thermal load and temperature gradients in the die materials. Conformal cooling with the growth of additive manufacturing has raised interest as a means of extending die life. In the current paper, conformal cooling channels’ performance and effect on the thermal cycle in high-pressure die casting and rheocasting are investigated for conventional HPDC and semisolid processing. It was found that conformal cooling aids die temperature reduction, and the use of die spray may be reduced and support the die-life extension. For the die filling, the increased temperature was possibly counterproductive. Instead, it was found that the main focus for conformal cooling should be focused to manage temperature around the in-let bushing and possibly the runner system. Due to the possible higher inlet pressures for semisolid casting, particular benefits could be seen.

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FEM Simulations for the Optimization of the Inlet Gate System in Rapid Investment Casting Process for the Realization of Heat Exchangers

International Journal of Metalcasting ◽

10.1007/s40962-021-00668-7 ◽

2021 ◽

Author(s):

D. Almonti ◽

G. Baiocco ◽

E. Mingione ◽

N. Ucciardello

Keyword(s):

Investment Casting ◽

Heat Exchangers ◽

Complex Geometry ◽

Heat Pipes ◽

Casting Process ◽

Added Value ◽

Cad Models ◽

Gate System ◽

Definition Of ◽

Metallic Parts

AbstractOver the last decades, additive manufacturing (AM) has become the principal production technology for prototypes and components with high added value. In the production of metallic parts, AM allows producing complex geometry with a single process. Also, AM admits a joining of elements that could not be realized with traditional methods. In addition, AM allows the manufacturing of components that could not be realized using other types of processes like reticular structures in heat exchangers. A solid mold investment casting that uses printed patterns overcomes typical limitations of additive processes such as expensive machinery and challenging process parameter settings. Indeed, rapid investment casting provides for a foundry epoxy pattern reproducing the component to exploit in the lost wax casting process. In this paper, aluminium radiators with flat heat pipes seamlessly connected with a cellular structure were conceived and produced. This paper aims at defining and investigating the principal foundry parameters to achieve a defect-free heat exchanger. For this purpose, different device CAD models were designed, considering four pipes’ thickness and length. Finite element method numerical simulations were performed to optimize the design of the casting process. Three different gate configurations were investigated for each length. The numerical investigations led to the definition of a castability range depending on flat heat pipes geometry and casting parameters. The optimal gate configuration was applied in the realization of AM patterns and casting processes

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Researches, studies and development prospects of the quality of metallic parts made on CNC

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/997/1/012057 ◽

2020 ◽

Vol 997 ◽

pp. 012057

Author(s):

N Puşcaş (Popescu) ◽

I Tempea

Keyword(s):

Metallic Parts ◽

Development Prospects

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Proceduee and some results of laboratory tests on wear of metallic parts of drill pump valves

Chemical and Petroleum Engineering ◽

10.1007/bf01144945 ◽

1974 ◽

Vol 10 (11) ◽

pp. 1027-1030

Author(s):

Ya. S. Mkrtychan ◽

S. P. Gerzha ◽

V. I. Shlykov

Keyword(s):

Laboratory Tests ◽

Metallic Parts ◽

Drill Pump

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XXIII.—On the Disruptive Discharge of Electricity: An Experimental Thesis for the Degree of Doctor of Science, Department A

Transactions of the Royal Society of Edinburgh ◽

10.1017/s0080456800090438 ◽

1878 ◽

Vol 28 (2) ◽

pp. 633-671 ◽

Cited By ~ 1

Author(s):

Alexander Macfarlane

Keyword(s):

Copper Wire ◽

Late Summer ◽

The Other ◽

Straight Line ◽

Summer Session ◽

The Difference ◽

A Chain ◽

The One ◽

Metallic Parts ◽

The University

The experiments to which I shall refer were carried out in the physical laboratory of the University during the late summer session. I was ably assisted in conducting the experiments by three students of the laboratory,—Messrs H. A. Salvesen, G. M. Connor, and D. E. Stewart. The method which was used of measuring the difference of potential required to produce a disruptive discharge of electricity under given conditions, is that described in a paper communicated to the Royal Society of Edinburgh in 1876 in the names of Mr J. A. Paton, M. A., and myself, and was suggested to me by Professor Tait as a means of attacking the experimental problems mentioned below.The above sketch which I took of the apparatus in situ may facilitate tha description of the method. The receiver of an air-pump, having a rod capable of being moved air-tight up and down through the neck, was attached to one of the conductors of a Holtz machine in such a manner that the conductor of the machine and the rod formed one conducting system. Projecting from the bottom of the receiver was a short metallic rod, forming one conductor with the metallic parts of the air-pump, and by means of a chain with the uninsulated conductor of the Holtz machine. Brass balls and discs of various sizes were made to order, capable of being screwed on to the ends of the rods. On the table, and at a distance of about six feet from the receiver, was a stand supporting two insulated brass balls, the one fixed, the other having one degree of freedom, viz., of moving in a straight line in the plane of the table. The fixed insulated ball A was made one conductor with the insulated conductor of the Holtz and the rod of the receiver, by means of a copper wire insulated with gutta percha, having one end stuck firmly into a hole in the collar of the receiver, and having the other fitted in between the glass stem and the hollow in the ball, by which it fitted on to the stem tightly. A thin wire similarly fitted in between the ball B and its insulating stem connected the ball with the insulated half ring of a divided ring reflecting electrometer.

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