First, the mold empty running test, verify the action of the mold
1. Inspection of the opening and closing mode of the mold under low pressure
The mold is divided into three parts: fast, medium and slow, and there is no abnormal sound during the opening and closing process, and there is no blockage;
The mold opening and closing action is smooth and there is no interference.
2. Inspection of the mold ejection system (low pressure)
The ejector action is divided into three parts: fast, medium and slow, and the presence or absence of abnormality is checked.
Whether the thimble (the cylinder) at the plane will be loosened or jammed after being ejected;
Inclined thimble or cylinder device, whether to add a locating pin (to prevent loosening or turning);
Whether the ejector system (thimble or top block) is ejected with abnormal noise and chatter.
3. Inspection of mold reset
The mold is divided into three fast, medium and slow speeds to see if it can return to the position (reset);
After resetting, the end face of the inclined thimble is not higher than the core 0.1mm or flush with the core;
Whether the contact with the limit is good or not;
Whether the thimble interferes with the action of the row position when the ejector is ejected (whether the slider returns to the position);
Whether the mold is equipped with a thimble reset device (mechanical).
4. Checking the position (slider) action
The mold is opened and closed three times according to fast, medium and slow, to observe whether the movement of the line is smooth;
Whether the position return is normal and whether the thimble interferes with it;
Whether the position of the line is secure;
The order of operation of the hydraulic core pulling device is sequential;
The line position has no strain or "catch" in the empty operation.
Second, the cavity into the glue balance test
5 molds are successively pressed in succession, and the weight is weighed;
Record the weight of a single piece of each product in each mold;
Reduce the amount of injection, and fill the molds of 20%, 50%, and 90% in sequence;
Weigh and record the weight of each of the above products;
If the difference between the maximum weight and the minimum weight of the product is less than 2%, it is acceptable; if the weight fluctuation error is within 2%, it indicates that the cavity is balanced, otherwise the rubber will be unbalanced;
If it is a single cavity mold, also do the glue balance test (observe the actual glue).
Third, the pressure holding time (gate freezing) time test
When the holding time is first set to 1 second, the mold is molded every time;
As shown in the table, increase the holding time in turn, reduce the cooling time, so that the entire cycle is unchanged (until the gate is frozen and the product weight does not increase);
Set a number of different dwell time as shown in the figure below, each time forming a 3-mode product, weigh the product weight of the specified cavity, and record the data in the table in turn;
Determine the best dwell time based on the chart.
Fourth, the determination of the best clamping force
When the pressure holding switching position/holding pressure is set to be optimal, the clamping force is set to within 90% of the maximum clamping force, and the mold is formed, and the weight of each mold product is recorded;
The clamping force is reduced by 5Ton in turn, and each time the mold is molded, the weight of each mold product is recorded until the weight of the product suddenly becomes large, and the weight increases by about 5% until the periphery of the product begins to generate flash.
