TW200425976A - Process and apparatus of high frequency vibration for grain refinement of casting - Google Patents

Abstract

This is a method and apparatus for grain refinement of cast products by applying high-frequency vibration during casting. This invention provides a high-frequency ultrasonic vibration process to obtain refined grain structures during casting. The high-frequency vibration process claimed involves the use of a source of vibration, and a vibration transmitting mechanism, which is installed outside of the mold and will not contact directly with the melt. With control of the vibration force and frequency, a desirable fine-grained structure can be attained. The said process of externally ultrasonic vibration-induced grain refinement can be applied to ingots or castings.

Description

425976 V. Description of the invention (1) Background of the invention,

In most cases, the basic structure of various U-bismuth alloys is long. 2 φ work has a uniform and fine structure, which is strong at room temperature, and more; Temple: The structure of Erji is not only stable in quality, but also Therefore, in addition to single crystal or direction a = heterosexual, this also develops from the refined structure for special conditions. Special alloy structures such as 1 or 2 are used for weaving. During the alloy solidification process ::! Try to control the alloy structure to a fine grain group as far as possible. The quality of the process also directly affects the plasticity of a certain post-grain. The process and cost of the one-man ,,,,, and chemistries are affected. "When the material organization is more refined, many physical properties of the materials are attacked. The miniaturization-it is the pull of the material world that can make even greater changes. "The organization must be achieved in the complete structure." The mechanism that promotes nucleation and suppresses the fineness of J is mainly capable of nucleation and not easy to phase: spine :: molten metal, 'there must be a certain degree of solidification in liquid metal, and the energy barrier must be crossed first. The formation of nucleation nucleus, and this cooling (Supercooling) can promote: =: agent as a nucleating agent inoculation method, but the effectiveness of the full pull ΐ t system, so practically limit the tritium, and there are nuclear species Shi tear temple sex is directly related. From the liquid, try to produce homogeneous by itself. Second, we must consider the addition method, dispersion method, ingredient selection, etc. There are two ways to form nuclei from the inside of the alloy liquid: one ::

200425976

The method known by the father is the MicroCast process, which can be used to cast fine-grained rotors. The principle is that the mold temperature is close to the dazzling point and the metal temperature. The metal liquid close to the melting point is overcooled during the process of entering the cavity. Undercooling can promote the formation of a large number of nuclear species, and high mold temperature can ensure that the metal liquid can fill the mold cavity smoothly. However, this method must accurately control the temperature, otherwise the refinement effect will be unstable. The other method is a shaking method, which uses a mechanical device to promote the disturbance of the metal liquid when the metal is solidifying. It can be regarded as one of the vibration refining methods, but the frequency used is extremely low. There is a manufacturing method called Gra This method is mainly used to make fine-grained turbine rotors. This disturbance can dissolve some solidified tree 1 tissues as nucleating agents. This method is easier to control, but loses its effect when the solid-liquid ratio is high. French professor Charles Vives once used an ultrasonic vibrator to refine the structure of molten metal. The high temperature of many metals can easily damage the vibrator and cause alloy pollution. In the developed ^ =: In the Republic of China No. 3 4 3 4 0 5 9 the method of adding a thinning agent and using electromagnetic stirring is disclosed. In the Republic of China Patent No. 3722-03, it is also disclosed that the use of high frequency electromagnetic stirring for hot top and refinement is a method of externally adding a vibration source of vibration. Inductive electromagnetic stirring is only suitable for thick parts such as ingots and other materials. Shaped workpieces cannot be effectively electromagnetically stirred. In US625383 i, a metal-based composite material was cast by ultrasonic vibration. The method is the same as that of Charles Vives. Since the wave is directly transmitted to the molten metal, it has a problem of resistance to contamination. Purpose of the invention This research is based on a more practical and easy-to-manufacture and shape-retaining method. In the process of refinement, it is still necessary to maintain the original process.

200425976 V. Description of the invention (3) ___ The nature of the material is not the target, so the degree of refinement is fine. · The microfabrication process can be refined to micron or submicron grains. In view of the foregoing methods, the present invention has its own advantages and disadvantages, which is to develop a kind of grain structure refinement that has easy controllability and can maintain easy manufacturability. . ^ Summary of the invention / The present invention is characterized by using an ultrasonic vibrator as a vibration source and selecting the ultra-high frequency range of ancient penetration. The high-frequency vibration wave passes through the extension. The j-mold transmission mechanism includes the extension rod and the mold. The two-frequency vibration wave can be transmitted to the solidified gold through the transmission mechanism and the mold :! = The temperature outside the mold and the melting and melting The metal is in direct contact, such as a warm melting casting environment, so the present invention can be applied to a variety of hybrid alloys and high-melting iron-based alloys. To include two parts of the vibration generator 1, the transmission mechanism 2, the vibration of the vibrational frequency (more than 10 kHz) ^: ^ The seven load vibration pneumatic system uses a generator that can generate a 'controller 4 can include signal production I ;: It can be used to adjust the vibration frequency, electrical vibration, etc., optionally, it can adjust the vibration frequency, ^ and f oscillometer, G), the vibration timing, the vibration J rate (kHz), the vibration intensity (the extension device of the acceleration wave 6 and the mold). ; // U power ^ The wave transmission mechanism 2 includes a length adjustment function, and the casting ^ 2 wave extension device can be selectively clamped or disassembled. It has a fast power transmission wheel, and the system is equipped with a fixed seat 8 and an electric winding 9 for fixing and the system configuration is not intended as shown in Figure 1. 200425976

Example l Efficacy: The porous ceramic mold was specially selected to advance into a large ... Lf ceramic mold is generally believed to be highly damping and easy to suck; the effect of the skin order to produce ceramic vibration. The experiment is based on the dewaxing casting process: ΓΓ The two stainless steels dissolve the 1HPH alloy, the casting vibration state is compared with the unadded vibration state, and the completion is small. The test conditions and: ΐ = Γ metallographic analysis method to analyze the crystal Grain size table 1. 17-4PΗ stainless steel example work bar test number vibration frequency vibration intensity vibration time

Test 1 Test 2 Test 2 Test 2 Test 3 Test 4 Test 5 Test 5 Without vibration ΙΟΚΗζ ΙΟΚΗζ 20KHz 20KHz 20kHz 50kHz 50kHz

0 20G 50G 10G 30G 50G 10G 30G 0 30Se 3 0 Sec 3 0 Sec 3 0 Sec 3 0 Sec 3 0 Sec 3 0 Sec c Grain size (microns) 67 50 47. 8 63. 2 48. 2 40. 4 57 . 2 47. 8

Example 2 Example 2 uses an aluminum-based alloy A357 as an alloy with the example. The test status and results are shown in Table 2. Table 2. A35 7 alloy test strip # Same test method, but only by melting.

Page 9 200425976 V. Description of the invention (5) Test number Oscillation frequency Vibration intensity Vibration time Grain size (micron) Test 1 No vibration 0 0 103 Test 2 ΙΟΚΗζ 15G 3 0 Sec 82.2 Test 2 ΙΟΚΗζ 20G 3 0 Sec 75 Test 2 30KHz 20G 3 0 Sec 60 Test 3 150kHz 75G 3 0 Sec 45

Page 10 200425976 Simple illustration 4 »Component code table 1 Vibration generator 2 Wave transmission mechanism 3 Vibrator 4 Controller 5 Mold clamping device 6 Extension device 7 Mold 8 Fixing base 9 Cable · The figure does not explain Figure 1 Schematic diagram of the chemical device 2 17-4PH Metallographic diagram of the unvibrated structure 3 1 7-4 ρ 振动 Vibration refined micrograph of the structure 4 A 3 5 7 Metallographic diagram of unvibrated structure 5 A 3 5 7 Vibration Fine organization metallography

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Claims (1)

200425976 VI. Scope of patent application Scope of application 1. A method and device for grain refining, which is a process of making grain refining during the manufacture of a metal clang by means of high-frequency vibration. The molten metal is in direct contact. 2 \ According to item 1 of the scope of the patent application, the process of making the crystals of the castings finer and reducing the number of voids, in which the oscillating strength is between 1G and 75G. 3 • Lightening of the grains of the castings according to item 1 of the scope of the patent application, where the oscillation frequency ranges from 10 to 150 kHz. 4. The method of making the casting grains fine according to item 1 of the scope of the patent application, wherein the shaking time is between 10 seconds and complete solidification. 5 · According to the device described in item 1 of the scope of patent application, a device for refining grains during metal casting by means of high-frequency vibration. The source of vibration is placed outside the mold and does not directly contact the metal liquid. 6 According to the declared patent scope, the vibration source described by the five households is a piezoelectric ultrasonic vibration method, and there is a wave transmission device between the vibration source and the mold. 7 / + According to item 6 of the scope of patent application, the wave transmission device is an extension rod or a mold clamping mechanism. ’