Parting agent for die-casting

• US 5,776,866 A
• Filed: 10/11/1996
• Issued: 07/07/1998
• Est. Priority Date: 10/12/1995
• Status: Expired due to Fees

• Current Assignee: Hitachi Powdered Metals Company Limited (Resonac Holdings Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Hitachi Powdered Metals Company Limited (Resonac Holdings Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Karaki, Mithuhiro, Hakoiwa, Masato, Midorikawa, Toshiaki, Nozaki, Mikiya
• Primary Examiner(s): Howard, Jacqueline V.
• Application Number:
  US08/729,506
• Time in Patent Office: 634 Days
• Field of Search: 508/122, 508/128, 508/130, 508/155, 508/175, 508/179
• US Class Current: 508/122
• CPC Class Codes: B22C 3/00 Selection of compositions for coating the surfaces of moulds, cores, or patterns
• CPC Class Codes: B22D 17/2007 Methods or apparatus for cleaning or lubricating moulds

Abstract

A parting agent capable of being applied to a die with split die members closed, and preventing the production of defective castings and the occurrence of heat shock as well as the precipitation of a solid lubricant. The parting agent is composed of a mixture of a parting component, a dispersing component for dispersing the paritng component through water, a surface active agent as a foaming agent, and water, and is foamed into a foamy state. The foamy parting agent can be applied to the die with the split die members closed. This overcomes problems caused by the scattering of the parting agent due to spraying. In addition, since the parting component is retained with a film defining foam, the separation and precipitation thereof can be prevented.

Claims

1. A parting agent for die-casting, comprising:

a parting component;

a dispersing component for dispersing said parting component through water; and

a surface active agent as a foaming agent, said parting component, said dispersing component and said surface active agent being mixed with water and foamed into a foamy state.

2. A parting agent as claimed in claim 1, wherein said parting component is contained in an amount ranging from 0.1 to 20% by weight of said parting agent.

3. A parting agent as claimed in claim 1, wherein said surface active agent is contained in an amount ranging from 0.1 to 10% by weight of said parting agent.

4. A parting agent as claimed in claim 1, wherein the foam size is 5 mm or less.

5. A parting agent as claimed in claim 1, wherein the volume of air to be mixed for foaming ranges from 7 to 30 times as large as that of said parting agent.

6. A parting agent as claimed in claim 1, wherein said parting component includes at least one kind of oil selected from the group consisting of silicone oil, mineral oil, animal oil, vegetable oil, synthetic oil and wax, and said dispersing component inclues an emulsifying agent for emulsifying and dispersing said oil.

7. A parting agent as claimed in claim 6, wherein said emulsifying agent is contained in an amount ranging from 5 to 40% by weight of said parting agent.

8. A parting agent as claimed in claim 1, wherein said parting component includes particles of at least one kind of a solid lubricant selected from the group consisting of graphite, molybdenum disulfide, talc, sericite, boron nitride, mica, graphite fluoride and fluorocarbon resin, and said dispersing component includes a dispersing agent for dispersing said particles of at least one kind of solid lubricant.

9. A parting agent as claimed in claim 8, wherein the particle diameter of said solid lubricant is 0.01 to 30 μ

m.

10. A parting agent as claimed in claim 8, wherein said dispersing agent is contained in an amount ranging from 1 to 30% by weight of said parting agent.

11. A parting agent as claimed in claim 1, 6, or 8, wherein said surface active agent is at least one of an anionic surface active agent and a nonionic surface active agent.

12. A parting agent as claimed in claim 11, wherein said anionic surface active agent is at least one selected from the group consisting of potassium oleate, sodium laurylsulfate, triethanolamine laurlysulfate, ammonium laurylsulfate, sodium polyoxyethylene laurylsulfate, and sodium lauryl alcohol ether sulfate.