Secondary transmission to the ball screw is currently the most precise and most used transmission device in transmission machines. Transport, building materials, medical devices, aerospace, military industry, rubber and plastics are widely used in the fields.
How to assess the accuracy of the sub-guided guide for ball screw? How to measure the lifespan of the quota? What are the means of pre-assembled? What are their characteristics? How to select models in scenarios such as vertical machining centers, rolling shoes, wire cutting machine tools, horizontal machining centers, gantry machining centers, etc. This issue of the Golden Fen Reading Hall will help you solve your doubts one by one.
This course is the 10th Welfare Live Public Course issue launched by Metal Processing Magazine. Details for you and compare the different internal traffic structures. The live broadcast in just over fifty minutes was watched by more than 10,000 people, which was strongly recognized by the public in the live broadcasting room.
Selected content
Main indicators to assess lead accuracy
EP Average travel travel in the effective route
The axial distance traveled by the nut with respect to the lead screw is called “trait”. The difference between the actual distance traveled and the distance traveled by hope (ideal) is called “travel deviation”. The gap of the nut on each section of the lead screw is different.
V up in the effective race (this type T element screw is not evaluated)
Any 300 mm race in line V300P
The quantity of race change V 2πp in the radians (that is to say in a single circle) is V 2πP (this type T element screw is not evaluated)
Nominal lifetime calculation method
Pre-servant methods and features
FFZD double nut seal
1. Brinte the joint to change the axial distance between the two nuts.
2. It is not easy to loosen after adjustment and has high rigidity. After use for a period of time, the racing path can be worn and re -equipped to ensure the precision of the lead screw.
FFB preplaging nuts in one
1. In a walnut body, the basic lead in an entire multiple of the transition area between the two closed ball chains (no load balls in this section) is modified into: n · pH ± △ pH.
2. The axial size is small. The impact of the interference of position errors on precision and performance of the transmission pair due to the shape of the double nut can be eliminated.
FFZ prelGG in enlarged steel steel
1. The balls and the racing path are in contact with four points.
2. It is only suitable for occasions when preload is small (less than 3% of the nominal dynamic load). If the preloading force is too large, the assembly will be difficult.
3. Among all kinds of preloading, this structure is the simplest and has the smallest axial size, which can eliminate the impact of interference from the shape of the nut and the position error on precision and the performance of the transmission pair.
Case of request from the vertical machining center industry
Recommended DK internal end -of -loop block structure
Wire cutting machine application box
FLOWS FLANT RECOGNLY FLOOK STRUCTION
Q:
Will the screw lead affect the positioning accuracy?
A:
No impact.
The main factors affecting the positioning accuracy are as follows: the level of precision of the lead screws, the reverse clearance, the axial rigidity of the screw system, etc.
Lead (lead = pitch * Number of thread heads) is only linked to the distance that the screw nut goes when it turns. The precision of positioning of the screw refers to the precision of the nut with screw passing through a fixed length at a distance. Currently, high precision, such as the screws used in horizontal machining centers, is generally greater than 16 mm.
Q:
Are there any advice to maintain and repair internal traffic in applications? What should I pay attention to?
A:
1. Add the lubricant or fat regularly and adjust the filling frequency as a function of working conditions.
2. After long-term use, if the precision of the machine tool is lost, adjust the joint and the steel balls in time and you can contact our company to make adjustments.
Q:
What are the factors that affect the lifespan of the lead screw?
A:
Carrying the pair of lead screws;
Q:
How to manage pre-stretch during the assembly of screws and how to control the thermal deformation during assembly?
A:
1. First, make sure that the pair of screws has a pre-stretched structure;
2. The leading race track has a racing compensation value C;
3. The pretension force can be calculated: F = 1.95 * ⊿t * d ^ 2. Be careful with excessive pretends.
Q:
What is the most essential difference between plastic inverters and metal inverters?
A:
The applicable temperature is different.
Q:
How to adjust the axial clearance of the pair of ball screws?
A:
The structure of the pair of ball screws is different and the adjustment and increase method is not used. The axial difference by adjusting the value of the steel ball gauge and the pre-green movement guide eliminates the axial clearance by adjusting the pitching deviation.
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