CN103627909B - Copper and its alloy melt spun field of force combined filtration method - Google Patents

Abstract

A kind of Copper and its alloy melt spun field of force combined filtration method, it is characterized in that comprising the steps: 1. prefabricated a kind of iron and steel or ceramic running channel, it is made up of sprue and cross gate, cross gate top circle hole centreline overlaps with sprue medullary ray, brushing refractory paint in running channel, abundant oven dry, placement of multiple layers ceramic filter (device) in cross gate, stack by the descending order in aperture of ceramic filter (device) from the inside to the outside, charcoal particle or charcoal lump is placed in the middle of ceramic filter (device), composition compound filter, this compound filter total thickness is 20 ~ 200mm, 2. compound filter is fixed on the turning axle of centrifugal device, 3. before cast, compound filter is preheated to more than 500 DEG C, 4. start centrifugal device, compound filter is rotated, rotating speed is in 10 ~ 2000r/min simultaneously, and then inject copper melts or copper alloy melt, copper melts or copper alloy melt carry out combined filtration through compound filter under centrifugal action.Advantage of the present invention is: environmental pollution is little, simple to operate, is easy to control, can removal of impurities, again can deoxidation.

Description

Copper and its alloy melt spun field of force combined filtration method

Technical field

The present invention relates to a kind of metal melt filtering method, particularly relate to a kind of Copper and its alloy melt spun field of force combined filtration method.

Background technology

Copper and alloy thereof are widely used in the fields such as electrical equipment, traffic, light industry, machinofacture, building industry, national defence.Aluminium is only second in the consumption of China's nonferrous materials.But Copper and its alloy is oxidizable in fusion process, air-breathing and gettering, copper alloy melt is produced and pollutes, reduce the manufacturability of material and the performance of product.Cleaning molten is the gordian technique ensureing alloy material metallurgical quality.The object of copper alloy cleaning molten, mainly by carrying out degasification, deoxidation, impurity elimination process to copper alloy melt, removing the gas in melt and inclusion, improving the purity closing copper alloy melt.The advantage of foam ceramic filter is that it can remove the diameter inclusion particle more much smaller than its through-hole diameter.Foam ceramic filter relies on mechanical grading, filter cake mechanism, deep-bed filtration three kinds of mechanism and make aluminium alloy sublimate.Alloy melt filtration, purification effect depend on the size of ceramic foam filter hole, melt flow through the length of distance, the direction of motion conversion of melt number of times etc. relevant.The aperture of ceramic foam filter is less, and filtration, purification effect is better, but aperture is tiny, and the resistance of melt flow is large; Equally, ceramic foam filter thickness is larger, and the distance that alloy melt flows through floamed ceramics filtrating piece is longer, and filter effect is also better, but alloy melt stream to overcome the kinetic energy that resistance consumes also larger.Use the ceramic foam filter that aperture is little, thickness is large, need very high molten metal statical head to overcome resistance to flow.In continuous casting or large discharge casting technique, utilize centrifugal force, be to provide high-head a kind of easy way.At present, Copper and its alloy composite purification technology, is particularly useful for melt composite purification technology in Copper and its alloy continuous casting and rolling production, is not yet developed.

Summary of the invention

The object of the present invention is to provide a kind of Copper and its alloy melt spun field of force combined filtration method that efficiency is high, effective, environmental pollution is little.

For achieving the above object, the technical solution adopted in the present invention is for comprising following method steps:

1. prefabricated a kind of iron and steel or ceramic running channel, it is made up of sprue and cross gate, cross gate top circle hole centreline overlaps with sprue medullary ray, in running channel, brushing refractory paint, fully dries, placement of multiple layers ceramic filter (device) in cross gate, stack by the descending order in aperture of ceramic filter (device) from the inside to the outside, place charcoal particle or charcoal lump in the middle of ceramic filter (device), composition compound filter, this compound filter total thickness is 20 ~ 200mm;

2. compound filter is fixed on the turning axle of centrifugal device;

3. before cast, compound filter is preheated to more than 500 DEG C;

4. start centrifugal device, compound filter is rotated, rotating speed is in 10 ~ 2000r/min simultaneously, and then inject copper melts or copper alloy melt, copper melts or copper alloy melt carry out combined filtration through compound filter under centrifugal action.

Described porcelain filter can be block foam porcelain filter, tubular ceramic foam filter, honeycomb ceramic filter sheet device, or the combination between them.Wherein, the pore size of described block foam porcelain filter is 10 ~ 40ppi, and thickness is 20 ~ 50mm; The pore size of described tubular ceramic foam filter is 10 ~ 40ppi, and barrel bore size is 20 ~ 400mm, and thickness is 20 ~ 50mm; The pore size of described ceramic honeycomb filter is 1 ~ 10mm, and thickness is 20 ~ 50mm.

Described charcoal particle is of a size of 1 × 10 × 10 ~ 2 × 20 × 50mm, and the thickness of the charcoal layer of formation is 20 ~ 100mm; Described charcoal lump is of a size of 2 × 15 × 15 ~ 2 × 25 × 30mm, and the thickness of the charcoal layer of formation is 20 ~ 100mm.

The invention has the beneficial effects as follows: 1. can removal of impurities, simultaneously again can deoxidation, more than 5 μm inclusion particle rejection rates can reach more than 90%, copper melts oxygen level≤5ppm, and Melt parity is high, can significantly put forward heavy alloyed over-all properties; 2. simple to operate, be easy to control; 3. environmental pollution is little, meets environment protection requirement; 4. apparatus structure is simple, and cost is lower.

Accompanying drawing explanation

Fig. 1 is the embodiment of the present invention 1 compound filter structural representation;

Fig. 2 is the embodiment of the present invention 2 compound filter structural representation;

Fig. 3 is the embodiment of the present invention 2 compound filter structure schematic top plan view.

In the drawings, 1, sprue 2, ceramic filter (device) 3, charcoal layer 4, cross gate.

Embodiment

Below by way of specific embodiment, technical scheme of the present invention is further described.

Embodiment 1:

Compound filter structural representation as shown in Figure 1, the method step is:

1. prefabricated a kind of iron and steel or ceramic running channel, it is made up of with cross gate 4 vertical with it sprue 1, and cross gate 4 two ends are equipped with exit passageway;

in running channel, brushing refractory paint, fully dries;

3. three layer filtration medium is stacked in the porcelain filter 2 in cross gate 4, order is as follows: the first layer near center is gross porosity ceramic foam filter, the size in its aperture is 10ppi, thickness is 20mm, the second layer places charcoal particle, charcoal particle is of a size of 2 × 20 × 20mm, the thickness of the charcoal layer 3 formed is 60mm, outermost third layer places pore foam porcelain filter, its aperture is 40ppi's, thickness is 20mm, wherein the gross porosity ceramic foam filter of the first layer can large-sized inclusions particle in filtering medium, the charcoal layer that the charcoal particle of the second layer is formed can carry out filtration deoxidation to medium, the pore foam porcelain filter of third layer can size is tiny in filtering medium inclusion particle,

4. compound filter is fixed on the turning axle of centrifugal device;

5. before cast, compound filter is preheated to 600 DEG C;

6. start centrifugal device, running channel is rotated, rotating speed is 600r/min, and then inject copper alloy melt, copper alloy melt carries out combined filtration through compound filter under centrifugal action, and alloy melt can obtain very high cleanliness factor.

Embodiment 2:

Compound filter structural representation as shown in Figures 2 and 3, the method step is:

1. prefabricated a kind of iron and steel running channel, it is made up of sprue 1 and tubular cross gate 4 concentric with it;

in running channel, brushing refractory paint, fully dries;

3. three layer filtration medium is stacked in the porcelain filter 2 in cross gate 4, order is as follows: the first layer near center is gross porosity tubular ceramic foam filter, the size in its aperture is 10ppi, the internal diameter size of cylinder is 100mm, thickness is 20mm, the second layer is placed and is of a size of 2 × 25 × 25mm charcoal lump, charcoal layer 3 thickness formed is 80mm, third layer places pore tubular ceramic foam filter, the size in its aperture is 40ppi, barrel bore is 300mm, thickness is 20mm, wherein the pore tubular ceramic foam filter of the first layer can large-sized inclusions particle in filtering medium, the charcoal layer that the charcoal lump of the second layer is formed can carry out filtration deoxidation to medium, the pore tubular ceramic foam filter of third layer can size is tiny in filtering medium inclusion particle,

4. compound filter is fixed on the turning axle of centrifugal device;

5. before cast, compound filter is preheated to 700 DEG C;

6. start centrifugal device, running channel is rotated, rotating speed is 500r/min, and then inject copper alloy melt, copper alloy melt carries out combined filtration through compound filter under centrifugal action.

Claims (1)

1. a Copper and its alloy melt spun field of force combined filtration method, is characterized in that comprising following method steps:

1. prefabricated a kind of iron and steel or ceramic running channel, it is made up of sprue and cross gate, cross gate top circle hole centreline overlaps with sprue medullary ray, in running channel, brushing refractory paint, fully dries, placement of multiple layers porcelain filter in cross gate, stack by the descending order in the aperture of porcelain filter from the inside to the outside, place charcoal particle or charcoal lump in the middle of porcelain filter, composition compound filter, this compound filter total thickness is 20 ~ 200mm;

2. compound filter is fixed on the turning axle of centrifugal device;

3. before cast, compound filter is preheated to more than 500 DEG C;

4. start centrifugal device, compound filter is rotated, make rotating speed simultaneously in 10 ~ 2000r/min, then pour into a mould copper melts or copper alloy melt, copper melts or copper alloy melt carry out combined filtration through compound filter under centrifugal action;

Described porcelain filter is block foam porcelain filter, tubular ceramic foam filter, ceramic honeycomb filter, or the combination between them;

The pore size of described block foam porcelain filter is 10 ~ 40ppi, and thickness is 20 ~ 50mm;

The pore size of described tubular ceramic foam filter is 10 ~ 40ppi, and barrel bore size is 20 ~ 400mm, and thickness is 20 ~ 50mm;

The pore size of described ceramic honeycomb filter is 1 ~ 10mm, and thickness is 20 ~ 50mm;

Described charcoal particle is of a size of 1 × 10 × 10 ~ 2 × 20 × 50mm, and the thickness of the charcoal layer of formation is 20 ~ 100mm; Described charcoal lump is of a size of 2 × 15 × 15 ~ 2 × 25 × 30mm, and the thickness of the charcoal layer of formation is 20 ~ 100mm.