Ultrasonic-based directional crystallization induction device and directional crystallization induction method

Abstract

The invention relates to the technical field of die-casting processes, in particular to an ultrasonic-based directional crystallization induction device and a directional crystallization induction method.The ultrasonic-based directional crystallization induction device comprises a die provided with a cavity used for loading a to-be-formed metal material; the pressing block is arranged at the top of the cavity; the first ultrasonic vibrator is arranged on the pressing block; the second ultrasonic vibrator is inserted into the cavity along the side face of the mold and makes contact with the metal material to be formed in the cavity. The controller is connected with the first ultrasonic vibrator and the second ultrasonic vibrator and used for adjusting working parameters of the ultrasonic vibrators, and the directional crystallization induction device based on ultrasound can accurately measure the temperature of a target device in the outer shell, can effectively protect the temperature measuring bag and has the advantage of being simple in structure.

Description

Technical Field

[0001] The invention relates to the technical field of die-casting technology, and in particular to an ultrasonic-based directional crystallization inducing device and a directional crystallization inducing method. Background Art

[0002] In the die casting process, the temperature control of the mold is crucial to ensure the quality and performance of the casting. The temperature control method of the traditional temperature controlled mold has some shortcomings.

[0003] The heat source system and cooling system usually act on the entire mold, but due to the different heating effects at different locations inside the mold, the internal mechanical properties of the molded product are unstable. This uneven temperature distribution will affect the quality and consistency of the casting. In addition, since the mold cannot accurately control the local temperature, this limits the application of the die casting process in the production of castings with special performance materials. Inaccurate local temperature control will cause defects in certain areas of the casting, such as pores, cold shuts, weld marks, etc.

[0004] Although the mold temperature controller of the prior art performs more precise temperature regulation, it still only controls the temperature as a whole and cannot achieve multi-dimensional temperature control. In fact, the method of heating the material with an additional heat source cannot achieve multi-dimensional targeted heating. Summary of the invention

[0005] The purpose of the present invention is to avoid the shortcomings of the prior art and provide an ultrasound-based directional crystallization inducing device, which can accurately measure the temperature of the target device in the outer shell, effectively protect the temperature measuring package and has the advantages of simple structure.

[0006] To achieve one of the above purposes, the present invention provides the following technical solutions:

[0007] Provides ultrasound-based directional crystallization induction device, including:

[0008] A mold, wherein the mold is provided with a cavity for loading the metal material to be formed;

[0009] A pressing block, the pressing block is arranged on the top of the cavity;

[0010] a first ultrasonic vibrator, wherein the first ultrasonic vibrator is disposed on the pressing block;

[0011] a second ultrasonic vibrator, the second ultrasonic vibrator being inserted into the cavity along the side of the mold and contacting the metal material to be formed in the cavity;

[0012] A controller is connected to the first ultrasonic vibrator and the second ultrasonic vibrator respectively, and is used to adjust working parameters of each ultrasonic vibrator.

[0013] In some embodiments, the first ultrasonic vibrator is disposed in the Z-axis direction of the cavity.

[0014] At least two second ultrasonic vibrators are provided, and the at least two second ultrasonic vibrators are respectively inserted into the mold cavity from the X-axis direction and the Y-axis direction, and the at least two second ultrasonic vibrators are distributed on the side of the mold in the vertical direction.

[0015] In some embodiments, an insertion channel is opened on the side of the mold, and the second ultrasonic vibrator is inserted into the mold cavity through the insertion channel.

[0016] In some embodiments, a plurality of heat exchange channels are formed on the cavity wall of the mold, and the heat exchange channels avoid the insertion channel.

[0017] Beneficial effects of the ultrasonic directional crystallization induction device of the present invention:

[0018] (1) The ultrasonic-based directional crystallization inducing device of the present invention is provided with a first ultrasonic vibrator on the top of the mold and a second ultrasonic vibrator on the side of the mold, wherein the first ultrasonic vibrator is connected to the pressing block. When the first ultrasonic vibrator is used to die-cast the metal powder into a shape of metal powder, the first ultrasonic vibrator uses its ultrasonic standing wave to induce the friction between the particles of the metal powder to quickly heat up, thereby achieving rapid melting of the material, which is beneficial to the production of grains of the entire metal material. At the same time, the second ultrasonic vibrator located on the side of the mold can selectively perform ultrasonic induction on the materials of each metal layer in space, so that the metal material can be directionally crystallized, thereby avoiding the problem of uneven crystallization due to different spatial positions in the mold, and effectively improving the mechanical properties of the metal material; and can also perform directionally crystallization according to the characteristics of the metal, thereby being able to flexibly prepare specific metal materials.

[0019] (2) The ultrasound-based directional crystallization inducing device of the present invention utilizes multi-dimensional ultrasonic vibrations to load inside the mold cavity during the die-casting process in which ultrasound provides the only heat source, and achieves regulation of the material crystallization process through interference during stress wave propagation in the casting, thereby further improving the performance of the casting material.

[0020] To achieve the second objective above, the present invention provides the following technical solutions:

[0021] A method for inducing directional crystallization is provided, characterized in that the method adopts the above-mentioned ultrasound-based directional crystallization inducing device, and comprises the following steps:

[0022] Placing the metal material to be formed into the cavity, and allowing the pressing block to pressurize the metal material and maintain the pressure;

[0023] Select the second ultrasonic vibrator at a specific spatial position according to the required grain characteristics, adjust the ultrasonic parameters of the first ultrasonic vibrator and the second ultrasonic vibrator respectively,

[0024] Turning on the first ultrasonic vibrator to heat and melt the metal material in the cavity,

[0025] The second ultrasonic vibrator is turned on to induce the metal material in the cavity to crystallize in a directional manner along the ultrasonic wave output direction of the second ultrasonic vibrator, thereby obtaining a die-cast metal material with preset characteristics.

[0026] In some embodiments, the working parameters of the first ultrasonic vibrator are: ultrasonic power 1000W to 3000W, amplitude 1 to 10 μm, frequency 17 to 50 kHz, and loading time 0.1 to 20 min.

[0027] In some embodiments, the working parameters of the second ultrasonic vibrator are: ultrasonic power range 10W to 500W, frequency range 17-50kHz, amplitude 1 to 10 μm.

[0028] In some embodiments, when adjusting the working parameters of the second ultrasonic vibrator, the ultrasonic power and ultrasonic frequency of the first ultrasonic vibrator are increased when the required grain size is larger.

[0029] In some embodiments, the pressing pressure of the briquetting is 1-30 MPa.

[0030] Beneficial effects of the induction method of directional crystallization of the present invention:

[0031] The method for inducing directional crystallization of the present invention sets the working parameters of the second ultrasonic vibrator according to the characteristics of the desired target metal material, and then starts the second ultrasonic vibrator during or after the first ultrasonic vibrator is working. The second ultrasonic vibrator directionally induces the metal material to crystallize according to the characteristics of the desired target metal material, and no additional heat source is required to heat the mold during the whole process. The first ultrasonic vibrator is used as an overall heat source to melt the metal material, and the second ultrasonic vibrator is set according to the target position. The second ultrasonic vibrator induces the metal material to be processed along the ultrasonic output direction through its own ultrasonic output direction, so that the metal material can achieve directional crystallization.

[0032] Also provided is a crystalline metal material, which is prepared by the above-mentioned directional crystallization inducing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of an ultrasound-based directional crystallization inducing device according to a specific embodiment;

[0034] Figure 2 is the processing direction diagram of Test Example 3;

[0035] Figure 3 This is a cross-sectional view of the metal material crystal of Test Example 3.

[0036] Reference numerals

[0037] 1. Mold; 2. Press block; 3. Cavity; 4. First ultrasonic vibrator; 5. Second ultrasonic vibrator; 6. Heat exchange channel. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0039] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" used in the present invention and the appended claims are intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0040] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] Example 1

[0042] The ultrasonic directional crystallization induction device disclosed in this embodiment is as follows: Figure 1 As shown, including:

[0043] A mold 1, wherein the mold 1 is provided with a cavity 3 for loading a metal material to be formed;

[0044] The mold 1 is a common die-casting mold 1 , and the cavity 3 of the mold 1 is used to place the metal material to be formed.

[0045] A pressing block 2, wherein the pressing block 2 is arranged at the top of the cavity 3;

[0046] The pressing block 2 is used to cooperate with the cavity 3 so as to press the metal material in the cavity 3, so as to form the metal material into a dense material and enable molding.

[0047] A first ultrasonic vibrator 4, wherein the first ultrasonic vibrator 4 is disposed on the pressing block 2;

[0048] Since the first ultrasonic vibrator 4 is arranged on the pressing block 2, when the first ultrasonic vibrator 4 vibrates, the first ultrasonic vibrator 4 can effectively transmit the ultrasonic standing wave to the metal material through the pressing block 2, so that the metal material can be melted faster and more directly without using an additional heat source.

[0049] The first ultrasonic vibrator 4 transmits the ultrasonic standing wave to the metal material through the pressing block 2, and utilizes the mechanical vibration of the ultrasonic wave to achieve thermal melting of the metal material without the need for an additional heat source. This process benefits from the piezoelectric effect and vibration transmission efficiency of the ultrasonic vibrator.

[0050] A second ultrasonic vibrator 5, which is inserted into the mold cavity 3 along the side of the mold 1 and contacts the metal material to be formed in the mold cavity 3;

[0051] The second ultrasonic vibrator 5 is arranged on the side of the mold 1, so that the metal material can be ultrasonically processed in any height direction, so that different metal layers can be selectively processed, thereby flexibly adjusting the properties of the metal material, effectively making the metal crystallization uniform or producing different metal crystal materials.

[0052] The second ultrasonic vibrator 5 can effectively perform ultrasonic processing on the metal material in any height direction, selectively process different metal layers, adjust the properties of the metal material, make the metal crystallization uniform, or produce different metal crystal materials.

[0053] A controller, wherein the controller is connected to the first ultrasonic vibrator 4 and the second ultrasonic vibrator 5 respectively, and is used to adjust working parameters of each ultrasonic vibrator.

[0054] The controller can set the working parameters of the first ultrasonic vibrator 4 and the second ultrasonic vibrator 5 according to the crystallization characteristics of the required metal material, thereby realizing intelligent and precise production.

[0055] The ultrasonic vibrator mentioned above is composed of an ultrasonic transducer and an ultrasonic horn, wherein the transducer is responsible for converting electrical energy into mechanical energy, while the horn changes the amplitude and transmits vibration to complete impedance transformation.

[0056] In this embodiment, the first ultrasonic vibrator 4 is arranged in the Z-axis direction of the cavity 3.

[0057] At least two second ultrasonic vibrators are provided, and the at least two second ultrasonic vibrators 5 are respectively inserted into the mold cavity 3 from the X-axis direction and the Y-axis direction, and the at least two second ultrasonic vibrators 5 are distributed on the side of the mold 1 in the vertical direction.

[0058] In order to accurately induce crystallization, the first ultrasonic vibrator 4 is set in the Z-axis direction, and the second ultrasonic vibrator 5 is set in the X-axis direction and the Y-axis direction, respectively. In this case, crystallization can be induced in a comprehensive and directional manner in three-dimensional space. In addition, multiple second ultrasonic vibrators 5 can be set on the surfaces of the X-axis direction and the Y-axis direction, so that crystallization can be induced in multiple levels, and crystallization can be further accurately controlled. For example, two second ultrasonic vibrators 5 are turned on in the X-axis direction, and the height difference between the two second ultrasonic vibrators 5 in the X-axis direction is 10 cm. In this case, the crystallization characteristics of the two metal layers can be made different.

[0059] In this embodiment, an insertion channel is opened on the side of the mold 1, and the second ultrasonic vibrator 5 is inserted into the mold cavity 3 through the insertion channel.

[0060] By opening a channel on the side of the mold 1 , the second ultrasonic vibrator 5 can be inserted conveniently and quickly.

[0061] In this embodiment, the wall of the cavity 3 of the mold 1 is provided with a plurality of heat exchange channels 6, and the heat exchange channels 6 avoid the insertion channels. The heat exchange channels 6 are original channels of the mold 1, and when the ultrasonic vibrator is used for heating, the heat exchange channels 6 can be used for cooling.

[0062] To further illustrate the working method of the directional crystallization inducing device, a method for inducing directional crystallization is disclosed, which is characterized in that the above-mentioned ultrasound-based directional crystallization inducing device is used, and the method comprises the following steps:

[0063] The metal material to be formed is placed into the mold cavity 3, and the pressing block 2 pressurizes the metal material and maintains the pressure;

[0064] The second ultrasonic vibrator at a specific spatial position is selected according to the required grain characteristics, and the ultrasonic parameters of the first ultrasonic vibrator 4 and the second ultrasonic vibrator 5 are adjusted respectively. For example, the grain size at the metal material 5 cm above the ground is preset to be 0.1 nm, and the grain size at the metal material 7 cm above the ground is preset to be 0.2 nm, then the working parameters of the second ultrasonic vibrator 5 at the corresponding position are set.

[0065] The first ultrasonic vibrator 4 is turned on to heat and melt the metal material in the cavity 3.

[0066] The second ultrasonic vibrator 5 is turned on to induce the metal material in the cavity 3 to crystallize in a directional manner along the ultrasonic wave output direction of the second ultrasonic vibrator 5 , thereby obtaining a die-cast metal material with preset characteristics.

[0067] The first ultrasonic vibrator 4 plays a role in thermal melting, while the second ultrasonic vibrator 5 plays a role in adjusting the orientation and inducing the metal material to crystallize.

[0068] In this embodiment, the working parameters of the first ultrasonic vibrator 4 are: ultrasonic power 1000W-3000W, amplitude 1-10 μm, frequency 17-50 kHz, loading time 0.1-20 min. Its working parameters can be adjusted according to actual conditions.

[0069] In this embodiment, the working parameters of the second ultrasonic vibrator 5 are: ultrasonic power range 10W-500W, frequency range 17-50kHz, amplitude 1-10μm. Its working parameters can be adjusted according to actual conditions.

[0070] In this embodiment, when adjusting the working parameters of the second ultrasonic vibrator 5 , the ultrasonic power and ultrasonic frequency of the first ultrasonic vibrator 4 are increased when the required grain size is larger.

[0071] Therefore, by setting the working parameters of the second ultrasonic vibrator 5 according to the required grain characteristics, in actual applications, a database of ultrasonic vibrator parameters and grain sizes is stored according to the number of experiments, and when in use, the database can be directly called.

[0072] In this embodiment, the pressing pressure of the pressing block 2 is 1-30 MPa.

[0073] Effect verification

[0074] To further illustrate the experimental effect of the present invention, the following experiment was conducted.

[0075] Test Example 1

[0076] Amorphous alloy die casting

[0077] The die casting is performed using a mold 1 with a size of 20*20*40mm (x, y, z). The mold 1 has a crystallization control ultrasonic vibrator in the X and Y directions respectively. The top of the vibrator vibrates through the opening of the mold 1 in the center of the X and Y directions to act on the material area of ​​the cavity 3. The temperature of the cavity 3 is adjusted to -50 degrees Celsius, and the maximum cooling capacity is maintained before the material is taken out.

[0078] Add V105s amorphous powder material with a particle size range of 15-53um into cavity 3.

[0079] The Z-axis ultrasonic vibrator is used to apply pressure, and the pressure is increased to 10Mpa and maintained.

[0080] The Z-axis ultrasonic vibrator vibrates to initiate ultrasonic-induced powder friction melting, with an ultrasonic power of 2500 W, an amplitude of 5 μm, a frequency of 28 kHz, and a loading time of 2 min.

[0081] During the melting ultrasonic heating process, the crystallization control ultrasonic vibrator in the X and Y axes is turned on. The power of the ultrasonic vibrator in the X and Y directions is maintained at 100W, the frequency range is 35kHz, the amplitude is 1um, and the crystallization control ultrasonic vibrator in the X and Y directions and the melting ultrasonic vibrator are turned off at the same time.

[0082] After cooling, remove the sample.

[0083] Test Example 2

[0084] Titanium alloy die casting

[0085] A die 1 with a size of 20*20*40mm (x, y, z) is used for die casting. There is one crystallization control ultrasonic vibrator in the X and Y directions of the die 1, and the top of the vibrator vibrates through the opening of the center position of the die 1 in the X and Y directions to act on the material area of ​​the cavity 3. The temperature of the cavity 3 is adjusted to 200 degrees Celsius.

[0086] Add TC4 titanium alloy powder material with a particle size range of 15-53um into cavity 3.

[0087] The Z-axis ultrasonic vibrator is used to apply pressure, and the pressure is increased to 20Mpa and maintained.

[0088] The Z-axis ultrasonic vibrator vibrates to initiate ultrasonic-induced powder friction melting, with an ultrasonic power of 1500 W, an amplitude of 3 μm, a frequency of 20 kHz, and a loading time of 7 min.

[0089] After the melting ultrasound is turned off, the crystallization control ultrasonic vibrator in the X and Y axes is turned on. The ultrasonic power in the X axis is 200W, the frequency range is 17-28kHz, the frequency is 2Hz, the amplitude is 2um, and the action time is 3min. The ultrasonic power in the X axis is 100W, the frequency range is 17-28kHz, the frequency is 2Hz, the amplitude is 2um, and the action time is 3min. After the crystallization control ultrasonic vibrator in the X and Y axes is turned on, the heating function of cavity 3 is maintained at 200 degrees Celsius, and the heat preservation is ended after the crystallization control ultrasound is turned off, and the sample is allowed to cool naturally.

[0090] After cooling, remove the sample.

[0091] Test Example 3

[0092] Stainless steel die casting

[0093] according to Figure 2 Processing is carried out in the direction of ultrasonic vibrator vibration as shown:

[0094] A die 1 with a size of 20*20*40mm (x, y, z) is used for die casting. There is one crystallization control ultrasonic vibrator in the X and Y directions of the die 1, and the top of the vibrator vibrates through the opening at the center of the X and Y directions of the die 1 to act on the material area of ​​the cavity 3. The temperature of the cavity 3 is normal temperature.

[0095] Add 316L stainless steel powder material with a particle size range of 15-53um into cavity 3.

[0096] The Z-axis ultrasonic vibrator is used to apply pressure, and the pressure is increased to 30Mpa and maintained.

[0097] The Z-axis ultrasonic vibrator vibrates to initiate ultrasonic-induced powder friction melting, with an ultrasonic power of 3000 W, an amplitude of 10 um, a frequency of 17 kHz, and a loading time of 10 min.

[0098] The crystallization control vibrator was turned on 8 minutes after the melting ultrasound heating was turned on. The crystallization control ultrasonic vibrator in the X and Y axis directions was turned on, and the ultrasonic power was set to 500W, the frequency range was 17kHz, the amplitude was 2um, and the action time was 2min. The crystallization control vibrator and the heating vibrator were turned off at the same time.

[0099] After cooling, take out the sample, polish it and observe it. Figure 3 As shown, it can be seen that the obtained sample can obtain materials with different grain diameters on the XY section and the ZY section. Therefore, the method of the present invention can successfully induce the crystallization of metal materials in a directional manner. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrasound-based directional crystallization induction device, characterized in that: include: A mold, wherein the mold is provided with a cavity for loading the metal material to be formed; A pressing block, the pressing block is arranged on the top of the cavity; a first ultrasonic vibrator, wherein the first ultrasonic vibrator is disposed on the pressing block; a second ultrasonic vibrator, the second ultrasonic vibrator being inserted into the cavity along the side of the mold and contacting the metal material to be formed in the cavity; A controller is connected to the first ultrasonic vibrator and the second ultrasonic vibrator respectively, and is used to adjust working parameters of each ultrasonic vibrator.

2. The ultrasonic directional crystallization induction device according to claim 1, characterized in that: The first ultrasonic vibrator is arranged in the Z-axis direction of the cavity. At least two second ultrasonic vibrators are provided, and the at least two second ultrasonic vibrators are respectively inserted into the mold cavity from the X-axis direction and the Y-axis direction, and the at least two second ultrasonic vibrators are distributed on the side of the mold in the vertical direction.

3. The ultrasonic directional crystallization induction device according to claim 2, characterized in that: An insertion channel is provided on the side of the mold, and the second ultrasonic vibrator is inserted into the mold cavity through the insertion channel.

4. The ultrasonic directional crystallization induction device according to claim 3, characterized in that: The cavity wall of the mold is provided with a plurality of heat exchange channels, and the heat exchange channels avoid the insertion channels.

5. A method for inducing directional crystallization, characterized in that: The ultrasonic directional crystallization inducing device according to any one of claims 1 to 4 comprises the following steps: Placing the metal material to be formed into the cavity, and allowing the pressing block to pressurize the metal material and maintain the pressure; Select the second ultrasonic vibrator at a specific spatial position according to the required grain characteristics, adjust the ultrasonic parameters of the first ultrasonic vibrator and the second ultrasonic vibrator respectively, Turning on the first ultrasonic vibrator to heat and melt the metal material in the cavity, The second ultrasonic vibrator is turned on to induce the metal material in the cavity to crystallize in a directional manner along the ultrasonic wave output direction of the second ultrasonic vibrator, thereby obtaining a die-cast metal material with preset characteristics.

6. The method for inducing directional crystallization according to claim 5, characterized in that: The working parameters of the first ultrasonic vibrator are: ultrasonic power 1000W-3000W, amplitude 1-10 μm, frequency 17-50 kHz, loading time 0.1-20 min.

7. The method for inducing directional crystallization according to claim 6, characterized in that: The working parameters of the second ultrasonic vibrator are: ultrasonic power range 10W-500W, frequency range 17-50kHz, amplitude 1-10μm.

8. The method for inducing directional crystallization according to claim 6, characterized in that: When adjusting the working parameters of the second ultrasonic vibrator, the ultrasonic power and the ultrasonic frequency of the first ultrasonic vibrator are increased when the required grain size is larger.

9. The method for inducing directional crystallization according to claim 7, characterized in that: The pressing pressure of the pressing block is 1-30Mpa.

10. A crystalline metal material, characterized in that: It is prepared by the directional crystallization inducing method according to claims 1 to 9.

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