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Aluminum bar extrusion, aging treatment and die nitriding technology
Oct 20,2024
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2020.
This standard is proposed by Changzhou Kaihong Aluminum Co., Ltd.
This standard was drafted by Changzhou Kaihong Aluminum Co., Ltd.
Main draftsmen of this standard: Liu Shengqiang, Ji Zhiwu and Yu Wenting.
This standard was first issued on May 15, 2024.
Aluminum bar extrusion, aging treatment and die nitriding technology
1 Scope
This standard specifies the extrusion, aging treatment and die nitriding of aluminum rod.
This standard applies to Changzhou Kaihong Aluminum Co., Ltd. aluminum bar extrusion, aging treatment and die nitriding technical standards.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document.
file. For undated references, the latest version (including all amendments) applies to this document.
GB/T 3190
Chemical composition of wrought aluminum and aluminum alloy
GB/T 3191
Aluminium and aluminium alloy extruded bars
GB/T 5237.1
Aluminium alloy building profiles-Part 1: Substrates
3 Extrusion and aging technology process
The bar is sent to the hot shear furnace (natural gas) for heating, and a shear machine is set at the outlet of the hot shear furnace to cut the aluminum bar to the required feet.
inch, the extruder is extruded according to the design shape, in order to maintain the bar temperature, the extruder is equipped with the corresponding mold heating furnace, through.
The mold in the extruder is heated by electric heating, and the heating temperature is generally 440~540 ℃. Extruded profiles through mechanical wind
Take air cooling to cool the profile to below 70 ℃, and then straighten the tension. The tension straightening process requires the profile temperature to be less than 50
℃, in order to achieve a better treatment effect, straightening treatment after the profile sawing, and then quality inspection. Profile root after quality inspection
According to customer requirements, artificial aging treatment is also required. Profiles after quality inspection are delivered or entered according to customer requirements or directly as products.
Subsequent processing.
Aging refers to the dissolution of supersaturated solid solution and lattice precipitation after a period of time at a constant temperature.
The phenomenon of gradually increasing intensity. The temperature in the furnace is kept constant at 200 5 ℃ by burning natural gas.
Generally in about 4 hours, after aging treatment of the profile strength is strengthened, and then into the surface treatment process.
4 Die nitriding
The used mold is nitrided in the factory, and nitriding refers to a process in which nitrogen atoms penetrate into a certain medium at a certain temperature.
Chemical heat treatment technology on the surface of the sub-piece. The nitrided products have excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance.
Characteristics, which are: first put the mold into the alkali washing pot, and then use the mold pressure extruder to extrude the aluminum block attached to the mold,
Then the mold into the nitriding furnace (electric) nitriding, through the ammonia, discharge the air in the furnace, heated to 500~520 ℃, maintained for about 4 hours,
Allow the mold to cool naturally and trim for standby.
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