Designing Bolts for 500kg Machine Component in Trains

In summary: You may want to find deceleration during emergency breaking, I'd guess it's more than acceleration under power.
  • #1
lingesh
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2
We are working on a machine component structure that weighs around 500 kg.This component is fixed inside the train on top roof using 6 bolts..Now the part is we need to design bolt size and no of bolts under worst condition..The acceleration of train may be taken as 0.3g,where g-accn due to gravity..

what kind of forces act on this bolt and how to design?
BOLT PLATE.PNG
BOLT PLATE.PNG
 
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  • #2
You description says the load is 500 kg, but your diagram says the load is 1000 kg. Which is it?

Since the train is accelerating, and presumably the c.g. of the load is located somewhere below the mounting plate attached to the roof, you'll need to expand your diagram and draw a free body diagram which includes the load and the mounting plate and then determine the static + dynamic loads when the train is accelerating.
 
  • #3
You may want to find deceleration during emergency breaking, I'd guess it's more than acceleration under power.
 
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  • #4
lingesh said:
We are working on a machine component structure that weighs around 500 kg.This component is fixed inside the train on top roof using 6 bolts..Now the part is we need to design bolt size and no of bolts under worst condition..The acceleration of train may be taken as 0.3g,where g-accn due to gravity..

what kind of forces act on this bolt and how to design?View attachment 85744 View attachment 85744

You don't have any professional Mechanical Engineers working on this project who can figure this out? That's kind of scary, IMO. You don't even mention issues like vibration and shock (I presume this location qualifies for the "sprung truck" shock/vibe spec?)
 
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  • #5
billy_joule said:
You may want to find deceleration during emergency breaking, I'd guess it's more than acceleration under power.
Hi,
very valid point..The value of deceleration is 0.3g.i mentioned it wrongly..And load consider it as 1000 kg...
 
  • #6
SteamKing said:
You description says the load is 500 kg, but your diagram says the load is 1000 kg. Which is it?

Since the train is accelerating, and presumably the c.g. of the load is located somewhere below the mounting plate attached to the roof, you'll need to expand your diagram and draw a free body diagram which includes the load and the mounting plate and then determine the static + dynamic loads when the train is accelerating.
Hi SteamKing,
I regret that mistake...Load is 1000 kg..If possible can you elaborate the method...

Thanks
 
  • #7
lingesh said:
Hi SteamKing,
I regret that mistake...Load is 1000 kg..If possible can you elaborate the method...

Thanks
By using the acceleration of the train and the mass of the load, you can create a "fictitious" force acting on the load, F = ma. Apply this load at the center of gravity of the object, and then use statics to figure out what tensions the bolts must hold.
 

1. How do you determine the appropriate size and material for bolts on a 500kg machine component in trains?

In order to determine the appropriate bolt size and material, it is important to consider the load and stress that the bolts will be subjected to. This can be calculated using engineering principles and taking into account factors such as the weight of the component, the forces acting upon it, and the desired safety factor. Additionally, the material should be chosen based on its strength and corrosion resistance.

2. What types of bolts are typically used for 500kg machine components in trains?

The type of bolt used will depend on the specific application and requirements of the machine component. However, some commonly used bolts for train components include hex bolts, carriage bolts, and flange bolts. These bolts are typically made of high-strength steel and may have specialized coatings for added durability.

3. Is it necessary to use a specific torque value when tightening bolts on a 500kg machine component in trains?

Yes, it is important to use a specific torque value when tightening bolts on any machine component, including those in trains. This ensures that the bolts are properly tightened and will not loosen over time, which could lead to malfunctions or safety hazards. The specific torque value can be determined through calculations or by consulting with a professional engineer.

4. How can you ensure the bolts on a 500kg machine component in trains are securely fastened?

In addition to using the correct torque value when tightening bolts, it is also important to properly prepare the bolt holes and use appropriate locking mechanisms, such as locking washers or thread-locking adhesives. Regular maintenance and inspections can also help ensure that the bolts remain securely fastened over time.

5. Are there any regulations or standards that must be followed when designing bolts for 500kg machine components in trains?

Yes, there are various regulations and standards that must be followed when designing bolts for any machine component, including those in trains. These may include industry-specific standards, such as those set by railway regulatory bodies, as well as more general standards for bolt materials and design, such as those set by the American Society for Testing and Materials (ASTM) or the International Organization for Standardization (ISO).

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