Stop Pin

A brief introduction

Thanks to the continuous progressing technology, we are now capable of so many things that were impossible before. For example, people used to take months by carriage to travel from one country to the other country, but now, all we need to do is to purchase a fly ticket and fly to our destination. Another notable and similar example is the train. People in the old days are required to ride for days, sometimes even months to travel from one city to another. The invention of the train has made the transportation within the country a lot more efficient. But the technology does not just benefit humans by means of transportation, there are so many other types of machines which have made their contribution to human society, like the technique of injection molding. In order for this technique to work, thousands of little parts need to be in the right place. One of the pieces is the main discussion today, the stop pin. 


What are stop pins?

So what are stop pins actually? Turns out that it is a very important component in the injection molding. To understand the function of the stop pin, we have to first understand what ejector plates and clamping plates are. The ejector plates are the type of device which is mostly used to assemble the ejector pin and return the pin. In the injection molding, there are two sets of the ejector plates. The first one is the ejector retainer plate, and it’s main function is to keep the heads of ejector pins in the right place. It is essential because if the head of the pins is not locked up, there is a high chance that the pins will come out during the process of injection molding. 

The second plate is called the ejector bar plate. The main function of the ejector bar plate is pretty much the same as the ejector retainer plate. Ejector bar plates and the retainer plates are bolted together. This is to make sure that the heads will stay in place. As for the clamping plates, it is a type of device to ensure a fault-free production. The clamping plates have the ability to prevent the unwanted movement of the spindle from its position, which is usually caused by the vibration, external forces or simply incorrect operation by the machine operator.


What are the functions of a stop pin?

 Now that we know about what the ejector plates and clamping plates are, it is much easier to address the function of the stop pin. The stop pin is primarily used to decrease the surface of contact between the ejector plates and the clamping plates. By adjusting the thickness of the stop pins, people can now determine how flat they want their ejector plates to be. Furthermore, it is also possible for the stop pin to serve as the buffer of the ejector plates. The position at which the stop pin is set is also very important. It is crucial to install the stop pin under rapid prototyping tools, this way, it will ensure the stop pin does not deform due to the huge stress. It is also important to keep in mind that to avoid the stop pin from interfering with other components of the mold. 


The material of stop pins

The material which is widely used to construct the stop pin is a type of steel called S45C. So what is S45C steel? S45C is a type of steel which is mostly used in the field of engineering. S45C is a type of steel which has medium strength. It is very suitable for the S45C steel to be made into devices like shafts studs or keys. The most common form for the S45C steel in the marker is the roll. It is also possible to provide the S45C steel in the form as the square bar, the round bar or the flat shape. The S45C steel is a metal which has brilliant ability when it comes to the process of welding. The S45C steel also has the capacity to be subjected to various types of heat treatments. 

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