Double-spiral aluminum alloy fluidity testing device and using method thereof

Abstract

The invention belongs to the technical field of aluminum alloy casting, and particularly relates to a double-helix type aluminum alloy fluidity testing device and a using method thereof. According to the technical scheme, the double-helix type aluminum alloy fluidity testing device comprises a base, an upper mold cover plate, a pouring funnel and a hollow plug, a double-flow-channel spiral-line-shaped groove is formed in the upper end face of the base, a slow flow groove is formed in the center of the double-flow-channel spiral-line-shaped groove, the pouring funnel is fixedly arranged in the center of the upper mold cover plate, and the hollow plug is arranged in the upper mold cover plate. The upper mold cover plate is placed on the base, and a bottom sprue of the pouring funnel is located above the slow flow groove; and the hollow plug is used for blocking a bottom pouring gate of the pouring funnel. The device provided by the invention is a metallic mold, is resistant to high temperature for a long time, not easy to deform, long in service life and free from permeation, a test result obtained by a double-helix mode is stable and accurate, and the fluidity can be judged and evaluated more accurately and quantitatively; and the liquidity of the alloy is expressed by measuring the solidification length of the alloy after flowing in the launder through the length measuring device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aluminum alloy casting, and particularly relates to a double-spiral aluminum alloy fluidity testing device and a use method thereof. BACKGROUND

[0002] Casting is an important forming method of alloys, and the fluidity of the metal melt is directly related to the quality of the castings. The fluidity performance of the alloy is a main evaluation index of the project and is also a main performance index of the target alloy, so the detection of the fluidity performance of the alloy is particularly important. Good fluidity of the metal liquid is beneficial to the filling and feeding of the metal melt, facilitates the preparation of dense parts with accurate shape and size and clear outline, and is a prerequisite for obtaining size-complete, outline-clear and thin and complex castings; good fluidity is beneficial to the floating and removal of gas and non-metallic inclusions; good fluidity enables the metal liquid to have good feeding capacity, and is beneficial to the reduction of defects such as shrinkage holes and shrinkage porosities, so as to improve the appearance quality and mechanical properties of the structural complex parts. With the development of economy, people have higher and higher requirements on the performance of materials, and accurate grasping of the fluidity of the high-temperature metal melt plays an important role in the quality of the castings. The fluidity of the liquid metal is measured by the method of pouring a fluidity sample.

[0003] At present, common metal fluidity experimental methods in the prior art at home and abroad mainly include spiral type measurement, radiation type measurement, complex groove type measurement, star type measurement and vacuum suction casting, among which the spiral type measurement is most widely used, that is, the molten metal liquid is manually poured into a spiral sample mold, the sand box is broken after the metal solidifies, and the points are counted manually, and the length of the flow during pouring is used to judge the filling capacity. The longer the length, the better the fluidity. However, at present, the single spiral type measurement of pouring casting from the core of the spiral line is mainly used, but the spiral line has large curvature at the core, which is easy to cause blockage, and the single result is not representative, and the consistency of the pouring temperature, pouring speed and weight of the metal liquid cannot be guaranteed during multiple tests. Moreover, the mold material is mostly a sand mold, and the use of the sand mold will cause serious oxidation and air absorption of the liquid metal, and is easy to cause various defects such as pores, inclusions, sand sticking, shrinkage porosity and shrinkage hole in the sample for measuring fluidity, so the test result is not accurate. At the same time, the metal and sand of the cast sample are mixed, which causes difficulty in subsequent recovery, and there are safety hazards. The sand mold is disposable, and a new sand mold must be built to complete one test. The mold structure is complex, the production and assembly process is complicated, the experimental process cannot be simplified, the casting speed is seriously affected, the metal holding time is long, and the energy consumption is high. It is not suitable for online detection by aluminum alloy material manufacturers. SUMMARY

[0004] The application provides a device for testing the flowability of aluminum alloy in a double helix mode and a use method thereof.

[0005] The technical scheme of the application is as follows:

[0006] The device for testing the flowability of aluminum alloy in a double helix mode comprises a base, an upper die cover plate, a pouring funnel and a hollow plug, a double-channel spiral line type groove is arranged on the upper end surface of the base, a buffer groove is arranged in the center of the double-channel spiral line type groove, the pouring funnel is fixedly arranged at the center of the upper die cover plate, the upper die cover plate is placed on the base, and the bottom gate of the pouring funnel is located above the buffer groove; and the hollow plug is used for plugging the bottom gate of the pouring funnel.

[0007] Further, the device for testing the flowability of aluminum alloy in a double helix mode, four lower positioning holes are arranged at four corners of the base respectively, four upper positioning holes are arranged at four corners of the upper die cover plate respectively, the upper positioning holes correspond to the lower positioning holes in position, and the base and the upper die cover plate are positioned by inserting a pin shaft into the corresponding upper positioning hole and lower positioning hole.

[0008] Further, the device for testing the flowability of aluminum alloy in a double helix mode, the base is made of a metal material, and the pouring funnel and the upper die cover plate are made of a refractory material.

[0009] Further, the device for testing the flowability of aluminum alloy in a double helix mode, the shape of the double-channel spiral line type groove is double spiral lines distributed to both sides of the buffer groove as a starting point, and the aluminum liquid flowing through the buffer groove flows into the center of the double-channel spiral line type groove from the outside of the spiral line.

[0010] Further, the device for testing the flowability of aluminum alloy in a double helix mode, the upper die cover plate is provided with an exhaust hole, and the center of the double-channel spiral line type groove corresponds to the position of the exhaust hole.

[0011] Further, the device for testing the flowability of aluminum alloy in a double helix mode, the upper end of the pouring funnel is provided with an overflow port.

[0012] Further, the device for testing the flowability of aluminum alloy in a double helix mode, a scale is marked in the double-channel spiral line type groove for measuring the length of the solidified metal.

[0013] The use method of the device for testing the flowability of aluminum alloy in a double helix mode comprises the following steps:

[0014] (1) Assemble the upper die cover plate and the base into one body;

[0015] (2) the assembled upper die cover plate and base are heated and kept warm with the hollow plug in a drying box for a certain time;

[0016] (3) preparation and smelting of the aluminum alloy to be measured;

[0017] (4) the hollow plug is placed at the bottom of the pouring funnel, and the high-temperature aluminum liquid after smelting is poured into the pouring funnel; when the aluminum liquid surface is level with the overflow port, the aluminum liquid flows out of the overflow port, and the pouring of the aluminum liquid is stopped;

[0018] (5) the temperature of the aluminum liquid in the pouring funnel is measured in real time using a thermocouple, and when the specified temperature is reached, the hollow plug is pulled up, so that the aluminum liquid flows into the double-flow spiral channel through the slow-flow channel;

[0019] (6) after the aluminum liquid solidifies, the upper die cover plate is opened to take out the casting, and the length of the spiral aluminum part is measured to analyze the flowability of the measured aluminum alloy liquid. The longer the length, the better the flowability of the aluminum alloy.

[0020] Further, in the step (2) of the use method, the temperature for keeping warm is 300-400C°, and the time for keeping warm is 1-2h.

[0021] The present application has the following beneficial effects:

[0022] 1. The present application can qualitatively detect the flowability of the melt, and accurately control three important parameters of pouring temperature, pouring speed and casting volume. The pouring funnel can slow down the temperature drop of the melt during the experiment, thereby improving the accuracy of the experiment. The design of the hollow plug ensures the consistency of the initial conditions before the experiment starts, can ensure the stability of the initial casting volume and pouring speed of the experiment, and avoids the influence of pouring the aluminum liquid on the experimental results. In addition, the design of the overflow port of the pouring funnel ensures the consistency of the initial test melt volume, so that the experiment is more accurate, and the double-flow type makes the experimental results more representative.

[0023] 2. The present application can obtain two flowability test samples at the same time without multiple pouring, and the experimental results are more representative under the same pouring system.

[0024] 3. The equipment used in the present application is all conventional general equipment, the process design is reasonable, the operation is simple, and the application is convenient, which greatly saves the experimental cost and test period. The metal mold has better repeatability than the conventional detection device. The pouring funnel and the upper die cover plate are made of refractory materials, have long service life, the mold structure is simple and easy to process, and the use method is simple, low in cost. The flowability of the alloy is represented by measuring the length of the alloy after flowing in the flow channel. The double-flow detection efficiency is high, and is suitable for use in aluminum alloy and other non-ferrous industries. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1A three-dimensional schematic diagram of a device for testing the fluidity of double-helix aluminum alloys;

[0026] Fig. 2 Front view of the cross-section of the apparatus for testing the fluidity of double-helix aluminum alloys;

[0027] Fig. 3 This is a top view of the base. Detailed Implementation

[0028] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection is not limited thereto. It should be noted that the specific embodiments described herein are merely some embodiments of this invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] like Figs. 1-3 As shown, a device for testing the flowability of a double-helix aluminum alloy includes a base 3, an upper mold cover plate 2, a pouring funnel 1, and a hollow plug 8. The upper surface of the base 3 is provided with a double-channel spiral groove 4, and a flow-retarding groove 5 is provided in the center of the double-channel spiral groove 4. The pouring funnel 1 is fixedly positioned at the center of the upper mold cover plate 2, and an overflow port 9 is provided at the upper end of the pouring funnel 1. The upper mold cover plate 2 is placed on the base 3. The four corners of the base 3 are respectively provided with lower positioning holes 7, and the four corners of the upper mold cover plate 2 are respectively provided with upper positioning holes 6. The upper positioning holes 6 and lower positioning holes 7 are positioned correspondingly. By inserting a pin into the corresponding upper positioning holes 6 and lower positioning holes 7, the base 3 and the upper mold cover plate 8 are aligned. The cover plate 2 is used for positioning; the upper mold cover plate 2 is provided with vent holes 10, and the center of the double-flow spiral groove 4 corresponds to the position of the vent holes 10; the bottom gate of the pouring funnel 1 is located above the slow-flow groove 5; the hollow plug 8 is used to seal the bottom gate of the pouring funnel 1; the double-flow spiral groove 4 is marked with a scale for measuring the length of solidified metal; the shape of the double-flow spiral groove 4 is a double spiral line distributed on both sides from the slow-flow groove 5 as the starting point, and the aluminum liquid flowing in through the slow-flow groove 5 flows from the outside of the spiral line of the double-flow spiral groove 4 to its center; the base 3 is made of metal material, and the pouring funnel 1 and the upper mold cover plate 2 are made of refractory material.

[0030] The method of using the above-mentioned double-helix aluminum alloy flowability test device includes the following steps:

[0031] (1) Assemble the upper mold cover plate 2 and the base 3 into one piece;

[0032] (2) Heat and keep warm the assembled upper mold cover plate 2 and base 3 with the hollow plug 8 in a drying oven. The heat preservation temperature is 300-400°C and the heat preservation time is 1-2 hours.

[0033] (3) Preparation and smelting of the aluminum alloy to be measured;

[0034] (4) Put the hollow plug 8 at the bottom of the pouring funnel 1, pour the high-temperature aluminum liquid into the pouring funnel 1, when the aluminum liquid surface is level with the overflow port 9, the aluminum liquid flows out of the overflow port 9, stop pouring the aluminum liquid;

[0035] (5) Use the thermocouple to measure the temperature of the aluminum liquid in the pouring funnel 1 in real time, reach the specified temperature, pull up the hollow plug 8, and make the aluminum liquid flow into the double-flow spiral channel 4 through the slow-flowing channel 5;

[0036] (6) After the aluminum liquid solidifies, open the upper mold cover plate 2 to take out the casting, measure the length of the spiral aluminum part, and analyze the fluidity of the measured aluminum alloy liquid. The longer the length, the better the fluidity of the aluminum alloy.

[0037] The above only describes the embodiments of the present application, and the specific structures and characteristics of the known schemes are not described in detail. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A device for testing the flowability of an aluminum alloy in a double helix, characterized by, The application relates to a double-flow channel spiral groove type aluminum alloy liquid flowability measuring device, which comprises a base, an upper die cover plate, a pouring funnel and a hollow plug.

2. The apparatus for testing the flowability of aluminum alloy according to claim 1, wherein The base is provided with lower positioning holes at four corners, the upper die cover plate is provided with upper positioning holes at four corners, the upper positioning holes and the lower positioning holes are in position correspondence, and the base and the upper die cover plate are positioned by inserting a pin shaft into the corresponding upper positioning hole and lower positioning hole.

3. The apparatus for testing the flowability of aluminum alloy according to claim 1, wherein The base is made of metal material, and the pouring funnel and the upper die cover plate are made of refractory material.

4. The apparatus for testing the flowability of aluminum alloy according to claim 1, wherein The double-flow channel spiral groove type slot is in the shape of double spiral lines distributed to the two sides of the slow flow groove, and the aluminum liquid flowing into the slow flow groove flows into the center of the double-flow channel spiral groove type slot from the outside of the spiral line.

5. The apparatus for testing the flowability of aluminum alloy according to claim 1, wherein The upper die cover plate is provided with exhaust holes, and the center of the double-flow channel spiral groove type slot is in position correspondence with the exhaust holes.

6. The apparatus for testing the flowability of aluminum alloy according to claim 1, wherein The upper end of the pouring funnel is provided with an overflow port.

7. The apparatus for testing the flowability of aluminum alloy according to claim 1, wherein The double-flow channel spiral groove type slot is marked with a scale for measuring the length of the solidified metal.

8. The method of using a double helix aluminum alloy flowability test device as defined in any of claims 1-7, wherein, The application further discloses a measuring method of the device. (1) assembling the upper die cover plate and the base into an integrated body; (2) heating and keeping warm the assembled upper die cover plate and base and the hollow plug in a drying box for a certain time; (3) preparing and smelting the aluminum alloy to be measured; (4) placing the hollow plug at the bottom of the pouring funnel, pouring the high-temperature aluminum liquid into the pouring funnel, stopping pouring when the aluminum liquid surface is level with the overflow port, and the aluminum liquid flows out from the overflow port; (5) measuring the temperature of the aluminum liquid in the pouring funnel in real time by using a thermocouple, lifting the hollow plug when the specified temperature is reached, and making the aluminum liquid flow into the double-flow channel spiral groove type slot through the slow flow groove; (6) taking out the casting by opening the upper die cover plate after the aluminum liquid is solidified, measuring the length of the spiral aluminum part, and analyzing the flowability of the measured aluminum alloy liquid, wherein the longer the length is, the better the flowability of the aluminum alloy is.

9. The method of use of claim 8, wherein, In the step (2), the temperature for keeping warm is 300-400 DEG C, and the keeping warm time is 1-2 h.

Images