CN108788068B

CN108788068B - Aluminum water filter pipe for high-pressure casting

Info

Publication number: CN108788068B
Application number: CN201810728522.1A
Authority: CN
Inventors: 马广兴
Original assignee: Suzhou Guangxing Mold Co Ltd
Current assignee: Suzhou Guangxing Mold Co Ltd
Priority date: 2018-07-05
Filing date: 2018-07-05
Publication date: 2020-05-19
Anticipated expiration: 2038-07-05
Also published as: CN108788068A

Abstract

The present case relates to an aluminium water filter tube for high pressure casting, includes: the aluminum water filter tube for high-pressure casting has the advantages that aluminum water does not need to penetrate through the filter tube, the filtering resistance can be effectively reduced, the gas evolution quantity of a filter screen during filtering can be effectively reduced, when the aluminum water passes through the filter tube at a high speed, impurities are adsorbed or intercepted by the inner wall of the filter tube, and a better filtering effect can be achieved.

Description

Aluminum water filter pipe for high-pressure casting

Technical Field

The invention belongs to the field of high-pressure casting, and particularly relates to an aluminum water filter pipe for high-pressure casting.

Background

In the foundry industry, inclusions are a very important type of casting defect, accounting for more than half of the total number of defects, which may be present in all castings, but in varying degrees of severity.

In the casting process of aluminum and aluminum alloy workpieces, impurities contained in molten aluminum comprise slag containing calcium carbonate and oxides of iron, manganese and aluminum, unmelted inoculant particles, sulfides, magnesium silicate, residual solvents and other solid impurities, the density of partial impurities is close, inclusions are difficult to float upwards, in addition, other inclusions such as sand and the like possibly fall into molten aluminum from a mold gate in the casting process, if the liquid/solid nonmetallic inclusions enter the casting along with the casting, quality problems such as slag holes, sand holes, air holes and the like are easily generated, and not only gas leakage is caused to generate waste products, but also the mechanical property of the materials is influenced.

In order to filter impurities to the maximum extent, manufacturing enterprises at home and abroad often place filter screens at the pouring gate, and the common filter screens include iron wire screens, fiber filter screens, ceramic filter screens and straight-hole ceramic filters. The traditional wire netting can directly influence the mechanical property of a casting due to Fe harmful elements, and a cut pouring gate cannot be directly recycled; the fiber filter screen has poor filtering effect, is easy to crack and difficult to install and fix, and easily causes the defects of air holes and slag air holes of the casting; although the ceramic filter screen and the straight-hole ceramic filter aluminum scraps can be recycled, the filter screen has high manufacturing cost and is fragile and difficult to fix.

In addition, the part of the filter screen can cause the casting to generate large air holes due to large gas evolution of the filter screen, so that the rejection rate of the casting is increased and the like.

Disclosure of Invention

The invention aims to provide an aluminum water filter pipe for high-pressure casting, which can efficiently filter impurities in aluminum water.

The invention also aims to provide the low-gas-evolution aluminum water filter pipe for high-pressure casting.

In order to solve the technical problem, the invention discloses an aluminum water filter pipe for high-pressure casting, which comprises: the filter tube is in a spiral shape, two ends of the filter tube are communicated with the feed port and the discharge port respectively, the filter tube comprises a first filter net layer, a second filter net layer, a third filter net layer, a protective layer and a heat preservation layer from inside to outside, and the first filter net layer, the second filter net layer and the third filter net layer can be detached. The spiral filter pipe enables high-pressure aluminum water to rotate rapidly when passing through, impurities in the aluminum water are thrown to the inner wall of the filter pipe by the generated centrifugal force, in addition, turbulence can be generated when the aluminum water flows through the surface of the unsmooth first filter screen layer, the impurities are driven to flush the inner wall of the filter pipe, and therefore the impurities are adsorbed or intercepted by the meshes formed by the first filter screen layer, the second filter screen layer and the third filter screen layer, and the purpose of filtering the impurities is achieved.

Preferably, the pipe diameter of the end of the filter pipe connected with the feed inlet is larger than that of the end of the filter pipe connected with the discharge outlet, and the pipe diameter of the filter pipe is gradually reduced from the end of the feed inlet to the end of the discharge outlet; the pipe diameter of the filter pipe is gradually reduced from one end of the feed port to one end of the discharge port, so that the speed of the molten aluminum in the filter pipe is increased under the wind tunnel effect, the centrifugal force on impurities in the molten aluminum is increased, and the impurities are separated; the inner diameter of one end of the filter pipe connected with the discharge port is not more than 15mm, and if the inner diameter of the filter pipe is too large, the filter effect is poor or the filter effect cannot be achieved.

Preferably, the first filter screen layer, the second filter screen layer and the third filter screen layer adopt 304 stainless steel nets as substrates.

Preferably, the surfaces of the first filter screen layer, the second filter screen layer and the third filter screen layer are coated with high-temperature-resistant paint or refractory material, so that the harm of Fe harmful elements to castings is reduced.

Preferably, the mesh diameter of the first filter screen layer is 1.2-1.6 mm. The filtering layer can intercept impurities and bubbles with large particle size.

Preferably, the mesh diameter of the second filter screen layer is 0.8-1.2 mm. The filter layer can retain impurities and bubbles with larger particle size.

Preferably, the mesh diameter of the third filter screen layer is 0.2-0.3 mm. The filter layer can retain impurities and bubbles with small particle size.

Preferably, the protective layer is a thin stainless steel plate, can prevent aluminum water from permeating through the protective layer, and plays a role in fixing and supporting the first filter screen layer, the second filter screen layer and the third filter screen layer.

Preferably, the heat-insulating layer is made of a ceramic heat-insulating material, so that the aluminum water is prevented from being obviously cooled in the filtering process.

Preferably, the spiral filter pipe surrounds the outside of the silicon carbide rod heating pipe, and plays a role in compensating heating.

It should be noted that the invention has a poor filtering effect on impurities with the particle size of less than 0.2mm in molten aluminum, but the influence of the impurities on the casting quality is small.

Has the advantages that:

according to the aluminum water filter pipe for high-pressure casting, aluminum water does not need to penetrate through the filter pipe, the filtering resistance can be effectively reduced, the gas evolution quantity of a filter screen in filtering can be reduced, and when the aluminum water passes through the filter pipe at a high speed, impurities are adsorbed or intercepted by the inner wall of the filter pipe, so that a good filtering effect can be achieved.

Drawings

FIG. 1 is a schematic view of an aluminum water filter tube for high-pressure casting.

Fig. 2 is a schematic cross-sectional view of a filter tube.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

Example 1

As shown in fig. 1 and 2, an aluminum water filter tube for high pressure casting is characterized by comprising: the filter tube comprises a feed inlet 1, a filter tube 2 and a discharge port 3, wherein the filter tube 1 is in a spiral shape, two ends of the filter tube 1 are respectively communicated with the feed inlet 1 and the discharge port 3, the filter tube 1 comprises a first filter net layer 205, a second filter net layer 204, a third filter net layer 203, a protective layer 202 and a heat insulation layer 201 from inside to outside, and the first filter net layer 205, the second filter net layer 204 and the third filter net layer can be disassembled 203.

The pipe diameter of one end of the filter pipe 2 connected with the feed inlet 1 is larger than that of one end of the filter pipe 2 connected with the discharge outlet 3, and the pipe diameter of the filter pipe 2 is gradually reduced from one end of the feed inlet 1 to one end of the discharge outlet 3; the inner diameter of one end of the filter pipe 2 connected with the discharge port 3 is not more than 15 mm.

The mesh bodies of the first filter mesh layer 205, the second filter mesh layer 204 and the third filter mesh layer 203 adopt 304 stainless steel meshes as substrates.

The net bodies of the first filter net layer 205, the second filter net layer 204 and the third filter net layer 203 are coated with high-temperature-resistant paint on the surfaces.

The mesh diameter of the first filter screen layer 205 is 1.2-1.6 mm.

The mesh diameter of the second filter screen layer 204 is 0.8-1.2 mm.

The mesh diameter of the third filter screen layer 203 is 0.2-0.3 mm.

The protective layer 202 is a thin stainless steel plate.

The heat-insulating layer 201 is made of a ceramic heat-insulating material.

The spiral filter pipe 1 surrounds the outside of the silicon carbide rod heating pipe 4.

Example 2

When the device is used, the silicon carbide rod heating pipe 4 is electrified and preheated, the feeding port 1 is connected with the aluminum water storage or heat preservation device, the discharging port 1 is butted with a pouring port, the aluminum water enters the filtering pipe 2 under high pressure, flows out of the discharging port 3 after being filtered, and directly enters the pouring port to start pouring.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.

Claims

1. The utility model provides a high pressure casting is with aluminium water filter tube which characterized in that includes: the filter pipe is spiral, two ends of the filter pipe are respectively communicated with the feed port and the discharge port, the filter pipe comprises a first filter net layer, a second filter net layer, a third filter net layer, a protective layer and a heat insulation layer from inside to outside, and the first filter net layer, the second filter net layer and the third filter net layer are detachable;

the pipe diameter of one end of the filter pipe connected with the feed port is larger than that of the other end of the filter pipe connected with the discharge port, and the pipe diameter of the filter pipe is gradually reduced from one end of the feed port to one end of the discharge port; the inner diameter of one end of the filter pipe connected with the discharge hole is not more than 15 mm;

the spiral filter pipe surrounds the outside of the silicon carbide rod heating pipe.

2. The aluminum water filter pipe for high pressure casting as claimed in claim 1, wherein the first filter screen layer, the second filter screen layer and the third filter screen layer are made of 304 stainless steel mesh as a substrate.

3. The aluminum water filter pipe for high pressure casting according to claim 1, wherein the surfaces of the first filter screen layer, the second filter screen layer and the third filter screen layer are coated with a high temperature resistant paint.

4. The aluminum water filter tube for high pressure casting according to claim 1, wherein the mesh diameter of the first filter mesh layer is 1.2 to 1.6 mm.

5. The aluminum water filter tube for high pressure casting according to claim 1, wherein the mesh diameter of the second filter mesh layer is 0.8 to 1.2 mm.

6. The aluminum water filter tube for high pressure casting according to claim 1, wherein the mesh diameter of the third filter mesh layer is 0.2 to 0.3 mm.

7. The aluminum water filter tube for high pressure casting according to claim 1, wherein the protective layer is a thin stainless steel plate.

8. The aluminum water filter tube for high pressure casting according to claim 1, wherein the heat insulating layer is a ceramic heat insulating material.