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Extrusion molding process method for sand mold or shell for casting

A process method and technology for casting sand, which are applied in casting molding equipment, casting mold components, casting molds, etc., can solve the problems of uneven strength, uneven sand mold compactness, insufficient sand shooting, etc., and achieve high compactness. , Promote the effect of high molding efficiency and simple equipment structure

Pending Publication Date: 2020-03-06
王海江
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of uneven compactness of sand molds, insufficient sand shooting at local locations, uneven strength, etc., the present invention proposes an extrusion molding process for sand molds or shells for casting, which is characterized in that it includes the following steps:

Method used

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  • Extrusion molding process method for sand mold or shell for casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The invention utilizes molds of dry and wet coated sand to extrude and form the shell mold used for producing train brake discs.

[0033] Step 1, prepare raw materials such as dry or wet coated sand, organic resin and high-purity silane coupling agent;

[0034] Step 2: Measuring the raw materials and adding them to the charging barrel, and quickly pushing and extruding the raw materials in the charging barrel into the pre-prepared cavity of the mold through extrusion molding equipment; cleaning the mold during pre-preparation.

[0035] The third step is to form a mold or shell with a thickness of 5mm by replacing the hot air with vacuum for a certain period of time and simultaneously hardening with electric heating; the heating temperature is 200°C.

[0036] Step 4: The formed mold or shell is bonded and assembled after being demoulded, checked and repaired to form a casting mold that can be used for pouring train brake discs.

Embodiment 2

[0038] Using cold box sand molds, extrusion molding shells for the production of railway couplers.

[0039] Step 1, prepare raw materials such as cold box sand, water glass resin and high-purity silane coupling agent;

[0040] Step 2: Measuring the raw materials and adding them to the charging barrel, and quickly pushing and extruding the raw materials in the charging barrel into the pre-prepared cavity of the mold through extrusion molding equipment; cleaning the mold during pre-preparation.

[0041] The third step is to form a mold or a shell with a thickness of 3mm by replacing triethylamine with vacuum for a certain period of time.

[0042] Step 4, the formed mold or shell is bonded and assembled after demolding, checking and repairing to form a casting mold that can be poured into the train coupler.

Embodiment 3

[0044] Using the mold of silicate binder molding sand, extrusion molding is used to produce shell molds for knuckle products.

[0045] Step 1: Equip raw materials such as silicate adhesive molding sand, acid-cured environment-friendly adhesive and silicon powder mixture; acid-cured environment-friendly adhesive refers to the invention patent of patent No. The binder in "Agent and its preparation method".

[0046] Step 2: Measuring the raw materials and adding them to the charging barrel, and quickly pushing and extruding the raw materials in the charging barrel into the pre-prepared cavity of the mold through extrusion molding equipment; cleaning the mold during pre-preparation.

[0047] Step 3, the carbon dioxide is replaced by vacuum for a certain period of time to harden and form a mold or shell with a thickness of 2mm.

[0048] Step 4, after demoulding, checking and repairing the molded mold or shell, bonding and assembling are carried out to form a casting mold for pouri...

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Abstract

The invention relates to an extrusion molding process method for a sand mold or a shell for casting. The method comprises the following steps of 1, preparing raw materials, wherein the raw materials comprise a casting sand mold, a surface modifying material and an adhesive; 2, metering the raw materials and adding the raw materials into a loading cylinder, and rapidly propelling and extruding theraw materials in the loading cylinder to a mold cavity through extrusion propelling forming equipment; 3, forming the mold or the shell through curing forming; and 4, bonding and assembling the formedmold or shell after the formed mold or shell is subjected to inspection and modification so that a casting mold capable of pouring can be formed. According to the method, the sand mold for casing isadopted to carry out rapid forming inside an extruding propelling mold cavity, so that the method has the advantages that the extrusion propelling forming equipment is simple structure, an air storagebag is not required, and safety and reliability can be achieved; furthermore, the propulsion forming efficiency is high, and rapid and efficient filling type compaction can be achieved; and finally,the mold (shell) is distinct in edge angles, high in compactness and good in dimensional stability.

Description

technical field [0001] The invention relates to the technical field of casting molding technology, in particular to an extrusion molding technology method of sand molds or shells for casting. Background technique [0002] Among the current casting molding methods, no-bake sand casting, coated sand heating and curing, cold box technology and other processes are all in several sand gradations of 30 / 50 mesh, 40 / 70 mesh, 50 / 100 mesh, and 70 / 140 mesh. The sand molding process within the scope, the main molding equipment is sand mixer, core shooter, these processes mainly have the following problems: [0003] ① The compactness of the sand mold is uneven, and it is easy to have insufficient sand injection in some places and uneven strength; [0004] ②The operation of the core shooter adopts the pneumatic compression bag, which has potential safety hazards; [0005] ③High energy consumption, irritating gas discharge everywhere, poor environmental protection; [0006] ④ High requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/12B22C13/08B22C15/02
CPCB22C9/02B22C9/123B22C13/08B22C15/02
Inventor 王海江唐盛来
Owner 王海江
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