Mold life prediction method and mold manufacturing method
By finding the temperature and thermal stress distribution in the mold, extracting the maximum value of thermal stress, and combining the yield strength and shrinkage rate, the thermal fatigue life of the mold is predicted, which solves the problem of insufficient mold life prediction accuracy in the existing technology and achieves high-precision life. Forecasting and cost savings.
Active Publication Date: 2020-06-30
PROTERIAL LTD
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Problems solved by technology
However, the relationship between the thermal fatigue life of the mold and the material properties of the mold or the thermal stress load is not clear, so it is not clear to what extent the life can be improved without actual application
Therefore, there are cases where the service life is not improved to the expected level, trial and error are repeated, and improvement takes time and cost.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0062] Die-casting was planned to be performed under the conditions in Table 1, and the thermal fatigue life (the number of cracks) of the mold when die-casting was actually performed was predicted. The mold used is as Figure 5 As shown, it is assumed that there are five V-grooves with respective corner radii (bottom radii) on the working surface.
[0063] [Table 1]
[0064]
[0065] First, according to the procedure of (a) above, the temperature distribution of the mold in a series of casting cycles is obtained (step A). As an example of a temperature profile created based on this calculation result, the temperature profile of the working surface at 0.5 seconds after the injection of molten metal into the cavity is completed is shown in Image 6 middle.
[0066] Next, according to the procedure of (b) above, the thermal stress distribution generated in the mold is obtained from the temperature distribution (step B). As an example of a thermal stress distribution diagr...
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Abstract
The invention provides a high-precision method for predicting the thermal fatigue life of a mold and a manufacturing method. A method of predicting the life of a mold, which is a method of predicting the thermal fatigue life of a mold that has a mold material having a hardness H, heating when repeatedly contacting the workpiece material, and cooling after contacting the workpiece material, and obtaining the temperature distribution of the heated mold , thermal stress distribution, maximum thermal stress σ at position x of the mold h_MAX , and the temperature T at this time h , using the mold material with hardness H, find the temperature T h Yield strength σ under y (T h ), and the temperature T of the mold when cooled c The shrinkage under will be σ h_MAX , σ y (T h ) and substituted into the following relational expression to obtain the thermal fatigue life N at the position x of the mold. Among them, C 1 、C 2 , m, n are constants.
Description
technical field [0001] The invention relates to a method for predicting the thermal fatigue life of a mold and a manufacturing method for the mold. Background technique [0002] In die-casting dies, hot forging dies, and other dies whose working surfaces are in contact with high-temperature workpieces, heating by contact with the workpiece and cooling by water-soluble mold release agents or lubricants are performed. The mold surface is subjected to compressive and tensile thermal stress. Moreover, in actual operation, due to repeated exposure to this thermal stress, thermal fatigue cracks are generated on the surface of the mold, for example, on the working surface of the mold, and the cracks are transferred to the material to be processed. If the transfer of the cracks becomes severe gradually and the mold cannot be used, the mold will be discarded. Especially in die-casting dies, cracks due to thermal fatigue are the biggest cause of failure, and it is strongly desired t...
Claims
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IPC IPC(8): B22C9/06B22C9/00B22D17/22G01N3/32
CPCG06F30/23G06F2111/08G06F2111/10G06F2113/22G06F2119/04B22C9/06B22D17/22G01N3/32G01N3/60G06F2119/18
Owner PROTERIAL LTD