Correct Use and Installation Recommendations of Mold Springs

The best mold spring should be used
In general, the most common cause of mold spring problem is often due to the incorrect selection and use of the spring. Spring accounts extremely small proportion in the total cost of the mold, trying to save cost in the spring may cause the premature failure of the spring, increase maintenance costs and reduce productivity, so that you will waste more time and labor costs, and even damage the mold to cause greater losses. Therefore, it is a wise investment to ensure to use the best mould spring in each application.

Correct use of mold spring
1. Prior to the construction of the mold, first determine the type and amount of the spring; it is the best choice to allow selecting the appropriate spring to be part of the design work. 
2. Pre-load the spring. The spring to be installed in the mold should be first preload 5%, in order to avoid uneven load stress haggardly generated to damage the spring life.
3. Do not arbitrarily cut and grind. Any grinding of inside and outside diameter of the spring or cut laps to match the size of the mold will easily lead to damage to the spring and cause early failure. 
4. Replacement needs to be done together. The springs should be replaced at the same time at maintenance, do not just replace a spring, because the springs in varying size, lengths, being old and new will cause unbalanced force. 
5. Protection and maintenance. 
The springs should be protected in high heat, corrosion and other environment, and the mold spring should be replaced in accordance with a pre-scheduled time interval. 
6. Deepen pilot hole in proportion. When the spring is installed in the renovated mold, the guide hole should be proportionately deepened, so that the 


can be installed stably and generate uniform and even stress.
7. Appropriately boot and protect. When the free length of the spring is greater than four times of the average diameter, the spring will be deformed in the compression case. To resolve this situation, you can use a sleeve or rod, or both in order to reduce the possibility of deformation and bending of the spring.
8. Long service life if used correctly. Though mold spring design allows you to produce the greatest stress, you do not expect it to retain the maximum working life if the mold springs work under maximum load.
　 
Correct mold spring installation method
To obtain the optimal use of performance, the spring installation should be noted the following two points:
1. When being mounted on the flat bottom hole without guide rod, the depth of the guide hole must be at least twice the depth of the spring.
2. When being mounted on the guide bar, the guide bar length shall be greater than the length of the spring.

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