CN104826992A - Precision casting method of melting mold - Google Patents

Abstract

The invention provides a precision casting method of a melting mold. The precision casting method comprises the following steps: smearing a layer of turpentine oil on the profiled surface, pouring in paste-like mold materials and pressing the melting mold, wherein the temperature of profiling cooling water is 14-24 DEG C, the cooling time is 20-100s, and a molding parting agent is 10# transformer oil; and drying the formed melting mold, then repairing the mold, assembling, sticking, testing, and then combining a product model and a pouring system together to obtain a module, wherein the process requirements of the module are as follows: the room temperature is 10-30 DEG C, the minimal gap in the module is 8mm, the minimal relatively large planar gap is 20mm, the minimal pressure head of the module is 60mm, the minimal after-head at the tail end is 10mm, and the welding between a gate and a wax stick in the wax mold needs to be tight. Compared with an existing low-temperature wax material water glass production process, the wax mold is less liable to deformation, and a cast has good dimensional stability; the labor intensity is low and the production efficiency is high; the utilization of the raw materials is full, and the production cost is low; and the cast has very high dimensional precision and surface smoothness.

Description

Precision-investment casting method

Technical field

The present invention relates to a kind of precision-investment casting method, belong to casting technology field.

Background technology

Along with model casting precision castings is towards the development of integration, thin-walled property and maximization, the compacting of wax-pattern and the design of die mould encounter new challenge, the flowing of moltening mold castings mould material presents non-Newton fluid characteristic, and the mould material of different composition has different rheological behaviors; Same mould material also can show different mobile performances under different External Force Actings.Mould material and suffered external force thereof determine the actual filling mould states of wax-pattern filling die mould, then also determine the precision of cast foundry goods.

Summary of the invention

The invention provides a kind of precision-investment casting method, the above defect can be overcome.

For solving above technical problem, the invention provides following technical scheme: a kind of precision-investment casting method,

(1) mould material is configured, the component of mould material and the percentage of each component are pertroleum wax 20-50%, Petropols 20-50%, high molecular polymer 1%-7%, mineral wax 5-10%, above each component is mixed into uniform one under the temperature conditions of 45-50 DEG C, then in cooling situation, by mould material vigorous stirring, mould material is made to become paste state for fusible pattern injection; Pertroleum wax is the mixture of microwax and paraffin;

(2) fusible pattern injection, is coated with on die mould surface and touches one deck turpentine oil, poured into by paste shape mould material, fusible pattern injection, technological requirement: room temperature 10 ~ 30 DEG C; Slack wax pressure injection temperature 45 ~ 46 DEG C; Pressure 0.2 ~ 0.6Mpa, dwell time 3 ~ 10s; Die mould coolant water temperature 14 ~ 24 DEG C; Cool time 20 ~ 100s; Molding parting compound is 10# transformer oil;

(3) fusible pattern be shaped is dried, carry out afterwards repairing a die, organizing sticky, inspection, then product model and running gate system are combined, obtain module;

(4) coat refractory material at the outer surface of module, carry out the manufacture of shell; Module technological requirement: room temperature 10 ~ 30 DEG C; Minimum clearance 8mm between module; The minimum 20mm of larger plane clearance; Module minimum head pressure 60mm; The minimum remainder 10mm of tail end; Wax-pattern ingate wants tight with welding between rod wax;

(5) shell manufactured is carried out roasting, sintering temperature 850 ~ 950 DEG C, roasting time 2.5-3h, the wax-pattern in shell is melted and goes;

(6) in the shell after roasting, product material aluminium alloy is poured into a mould;

(7) after product material aluminium alloy cooled and solidified, foundry goods is cleared up to obtain.

More existing low temperature wax material waterglass production technology, wax-pattern is not yielding, casting dimension good stability; Labour intensity is low, and production efficiency is high; Raw material utilize fully, and production cost is low; Foundry goods has very high dimensional accuracy and surface smoothness.

Detailed description of the invention

A kind of precision-investment casting method,

(1) mould material is configured, the component of mould material and the percentage of each component are pertroleum wax 20-50%, Petropols 20-50%, high molecular polymer 1%-7%, mineral wax 5-10%, above each component is mixed into uniform one under the temperature conditions of 45-50 DEG C, then in cooling situation, by mould material vigorous stirring, mould material is made to become paste state for fusible pattern injection; Pertroleum wax is the mixture of microwax and paraffin;

(2) fusible pattern injection, is coated with on die mould surface and touches one deck turpentine oil, poured into by paste shape mould material, fusible pattern injection, technological requirement: room temperature 10 ~ 30 DEG C; Slack wax pressure injection temperature 45 ~ 46 DEG C; Pressure 0.2 ~ 0.6Mpa, dwell time 3 ~ 10s; Die mould coolant water temperature 14 ~ 24 DEG C; Cool time 20 ~ 100s; Molding parting compound is 10# transformer oil;

(3) fusible pattern be shaped is dried, carry out afterwards repairing a die, organizing sticky, inspection, then product model and running gate system are combined, obtain module;

(4) coat refractory material at the outer surface of module, carry out the manufacture of shell; Module technological requirement: room temperature 10 ~ 30 DEG C; Minimum clearance 8mm between module; The minimum 20mm of larger plane clearance; Module minimum head pressure 60mm; The minimum remainder 10mm of tail end; Wax-pattern ingate wants tight with welding between rod wax;

(5) shell manufactured is carried out roasting, sintering temperature 850 ~ 950 DEG C, roasting time 2.5-3h, the wax-pattern in shell is melted and goes;

(6) in the shell after roasting, product material aluminium alloy is poured into a mould;

(7) after product material aluminium alloy cooled and solidified, foundry goods is cleared up to obtain.

Reinforcing pull rod manufacturing process provided by the invention, achieve and improve its machine components service life, improve its product percent of pass, improve its production efficiency, reduce the technique effect of its production cost, structure of the present invention is simple.

Detailed description of the invention of the present invention does not form the restriction to the application's scope; within every spirit in the present invention's design and principle, any amendment that one of skill in the art can make, equivalent to replace and improvement etc. all should be included within protection scope of the present invention.

Claims (1)

1. a precision-investment casting method, is characterized in that comprising the steps:

(1) mould material is configured, the component of mould material and the percentage of each component are pertroleum wax 20-50%, Petropols 20-50%, high molecular polymer 1%-7%, mineral wax 5-10%, above each component is mixed into uniform one under the temperature conditions of 45-50 DEG C, then in cooling situation, by mould material vigorous stirring, mould material is made to become paste state for fusible pattern injection; Pertroleum wax is the mixture of microwax and paraffin;

(2) fusible pattern injection, is coated with on die mould surface and touches one deck turpentine oil, poured into by paste shape mould material, fusible pattern injection, technological requirement: room temperature 10 ~ 30 DEG C; Slack wax pressure injection temperature 45 ~ 46 DEG C; Pressure 0.2 ~ 0.6Mpa, dwell time 3 ~ 10s; Die mould coolant water temperature 14 ~ 24 DEG C; Cool time 20 ~ 100s; Molding parting compound is 10# transformer oil;

(3) fusible pattern be shaped is dried, carry out afterwards repairing a die, organizing sticky, inspection, then product model and running gate system are combined, obtain module;

(4) coat refractory material at the outer surface of module, carry out the manufacture of shell; Module technological requirement: room temperature 10 ~ 30 DEG C; Minimum clearance 8mm between module; The minimum 20mm of larger plane clearance; Module minimum head pressure 60mm; The minimum remainder 10mm of tail end; Wax-pattern ingate wants tight with welding between rod wax;

(5) shell manufactured is carried out roasting, sintering temperature 850 ~ 950 DEG C, roasting time 2.5-3h, the wax-pattern in shell is melted and goes;

(6) in the shell after roasting, product material aluminium alloy is poured into a mould;

(7) after product material aluminium alloy cooled and solidified, foundry goods is cleared up to obtain.