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A kind of extrusion processing method of magnesium alloy az91d internal thread

A technology of AZ91D extrusion processing, applied in the direction of threaded products, metal processing equipment, manufacturing tools, etc., can solve the problems of low elongation, poor plasticity, unsuitability, etc., and achieve the improvement of tensile strength, surface hardness, The effect of increasing the shear strength

Active Publication Date: 2020-11-03
HARBIN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since AZ91D is a cast magnesium alloy with low elongation and poor plasticity at room temperature, it is generally considered unsuitable for extrusion thread processing

Method used

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  • A kind of extrusion processing method of magnesium alloy az91d internal thread
  • A kind of extrusion processing method of magnesium alloy az91d internal thread
  • A kind of extrusion processing method of magnesium alloy az91d internal thread

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0026] A method for extrusion processing of magnesium alloy AZ91D internal thread, comprising the following steps:

[0027] Step 1, after machining the magnesium alloy AZ91D ingot, obtain the magnesium alloy AZ91D bar stock, stand-by;

[0028] Step 2. Place the magnesium alloy AZ91D bar material machined in step 1 in the middle of the inner cavity of the mold, and tighten the threads at both ends of the mold for use;

[0029] Step 3. Put the mold fixed in step 2 into a box-type resistance furnace, heat it up to 400°C and keep it warm for 20 hours, take out the heated mold for water cooling, and set it aside;

[0030] Step 4. Take out the magnesium alloy AZ91D bar stock cooled in step 3 from the mold, clamp it on the working plane of the machining center, drill the hole at the center, and drill the hole for use;

[0031] Step 5, process 45 ° chamfering on the bottom hole aperture of the magnesium alloy AZ91D bar stock after step 4 drilling, obtain the magnesium alloy AZ91D bar...

specific Embodiment approach 2

[0046] A method for extrusion processing of magnesium alloy AZ91D internal thread, comprising the following steps:

[0047] Step 1, after machining the magnesium alloy AZ91D ingot, obtain the magnesium alloy AZ91D bar stock, stand-by;

[0048] Step 2. Place the magnesium alloy AZ91D bar material machined in step 1 in the middle of the inner cavity of the mold, and tighten the threads at both ends of the mold for use;

[0049] Step 3. Put the mold fixed in step 2 into a box-type resistance furnace, heat it up to 440°C and keep it warm for 18 hours, take out the heated mold and water-cool it, and set it aside;

[0050] Step 4. Take out the magnesium alloy AZ91D bar stock cooled in step 3 from the mold, clamp it on the working plane of the machining center, drill the hole at the center, and drill the hole for use;

[0051] Step 5, process 45 ° chamfering on the bottom hole aperture of the magnesium alloy AZ91D bar stock after step 4 drilling, obtain the magnesium alloy AZ91D bar...

specific Embodiment approach 3

[0066] A method for extrusion processing of magnesium alloy AZ91D internal thread, comprising the following steps:

[0067] Step 1, after machining the magnesium alloy AZ91D ingot, obtain the magnesium alloy AZ91D bar stock, stand-by;

[0068] Step 2. Place the magnesium alloy AZ91D bar material machined in step 1 in the middle of the inner cavity of the mold, and tighten the threads at both ends of the mold for use;

[0069] Step 3. Put the mold fixed in step 2 into a box-type resistance furnace, heat it up to 380-440°C and keep it warm for 16-22 hours. Take out the heated mold and water-cool it for use;

[0070] Step 4. Take out the magnesium alloy AZ91D bar stock cooled in step 3 from the mold, clamp it on the working plane of the machining center, drill the hole at the center, and drill the hole for use;

[0071] Step 5, process 45 ° chamfering on the bottom hole aperture of the magnesium alloy AZ91D bar stock after step 4 drilling, obtain the magnesium alloy AZ91D bar st...

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Abstract

The invention discloses an extrusion processing method of magnesium alloy AZ91D internal threads, and belongs to the field of material extrusion thread processing methods. The extrusion processing method solves the problem that the magnesium alloy extrusion thread processing technology is difficult. The extrusion processing method comprises the steps that after machining is conducted on a magnesium alloy AZ91D cast ingot, so that a magnesium alloy AZ91D bar material is obtained; the magnesium alloy AZ91D bar material is placed in the middle of an inner cavity of a die, and the two ends of thedie are tightly screwed and fixed in a threaded mode; then the die is put into a box type resistance furnace, and after the temperature is risen to range from 380 DEG C to 440 DEG C, the temperature is kept for 16-22 hours; after water cooling is accomplished, the bar material is clamped on the working plane of a machining center, and a hole position is formed in the center through drilling; a 45-degree chamfer is processed in a hole opening of a bottom hole, so that the magnesium alloy AZ91D bar material with the preformed bottom hole is obtained; and the magnesium alloy AZ91D bar material with the preformed bottom hole is processed by an extrusion tap in an extrusion mode under the condition of lubrication of an emulsion, the concentration of the emulsion is 6%, and the rotating speed ofa main shaft in the thread extrusion process is controlled to range from 30r / min to 80r / min, so that the magnesium alloy AZ91D internal threads are obtained. Compared with threads formed by cutting,the magnesium alloy AZ91D internal threads have the advantages that the tensile strength is increased by 20%-30%, and the shear strength is increased by 5%-10%.

Description

technical field [0001] The invention belongs to the field of material extrusion thread processing method, and in particular relates to an extrusion processing method of magnesium alloy AZ91D internal thread. Background technique [0002] Using traditional cutting taps to tap magnesium alloy, chips will be generated during the tapping process. The chips stick to the inner wall of the thread and are difficult to clean, affecting the cleanliness of the product. During the processing and use of threaded holes, rotten teeth and thread slippage are common, which seriously affects the assembly quality. With the improvement of processing environment requirements and the concept of "green manufacturing", the application of extruded thread in industry is increasing, but the application of magnesium alloy is less. Since AZ91D is a cast magnesium alloy with low elongation and poor plasticity at room temperature, it is generally considered unsuitable for extrusion thread processing. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21H3/08B23P15/00B23G1/16
CPCB21H3/08B23G1/16B23P15/00
Inventor 刘萌吉泽升胡茂良许红雨王晔崔鹏星张勋
Owner HARBIN UNIV OF SCI & TECH