Method for improving mold hardness of EPP foaming mold
A technology for foaming molds and mold cores, which is applied in the field of improving the hardness of EPP foam mold cores, which can solve problems such as increasing production costs, affecting the service life of the mold, and prone to cracks in the mold core, and achieves the effect of prolonging the service life
Active Publication Date: 2013-06-05
NANTONG CHAODA EQUIP CO LTD
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AI Technical Summary
Problems solved by technology
[0003] During the foaming production of the mold core of the EPP foaming mold, due to long-term high pressure, the surface of the mold core is prone to cracks and other problems after long-term use, which affects the service life of the mold and increases the production cost.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0007] First use the sand casting method to cast the aluminum alloy mold core, the hardness of the mold core should reach 40-50HB, then correct the mold core, put it in the oven to heat after the correction; after the heating, take out the mold core and put it in room temperature water to cool; Finally, put the cooled mold core into the oven again for heat preservation treatment. After heat preservation treatment, it can be machined after cooling at room temperature. The above temperature and time parameters and hardness changes are as follows:
[0008] .
[0009] After actual testing, the service life of the untreated aluminum alloy mold core of about 50HB is 200,000 mold times per month, the service life of the mold core of 55-60HB is 210,000-220,000 mold times per month, and the service life of the mold core of 70-80HB is 26 months. -290,000 mold times, the service life of 75-85HB mold core is 280,000-320,000 mold times per month, the service life of 90-100HB mold core is...
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Abstract
The invention relates to a method for improving mold hardness of an EPP foaming mold. According to the innovative points, the method comprises the following steps: putting a cast aluminum alloy into an oven, wherein the temperature of the oven is 450 to 460 DEG C, and the thermal insulation time is 4 hours; taking the mold out, and rapidly cooling the mold in normal temperature water; and finally, putting the cooled mold in the oven, wherein the temperature of the oven is 165 to 170 DEG C, and the thermal insulation time is 8 hours. The cast aluminum alloy is put into the oven, and the aluminum alloy is heated to a high-temperature single-phase area for keeping the constant temperature, so that the intermediate phase is fully dissolved in solid solution; the mold is taken out and is rapidly cooled in the normal temperature water so as to obtain saturated solid solution; and finally, the cooled mold is put into the oven to achieve a manual actual effect, and the aluminum alloy with high plasticity and toughness is obtained. The mold hardness is improved to over 80HB from the original 50HB, and the service life of the mold is greatly prolonged.
Description
technical field [0001] The invention relates to a method for increasing the hardness of the core of an EPP foaming mold. Background technique [0002] Expandable polypropylene foam (EPP) is a kind of expanded polypropylene, which has light specific gravity, strong temperature resistance, good cushioning performance, and can be 100% recycled, so it is suitable for safety in the automobile manufacturing industry. , environmental protection, weight reduction and other requirements, it has been widely used in the automotive field. [0003] During the foaming production of the core of the EPP foaming mold, due to the long-term high pressure, the surface of the core is prone to cracks and other problems after long-term use, which affects the service life of the mold and increases the production cost. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a method for improving the hardness of the core of an EPP foaming mold ...
Claims
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IPC IPC(8): B23P15/24
Inventor 冯建军
Owner NANTONG CHAODA EQUIP CO LTD