About the processing and procurement of eyebolts
1. About the processing of eyebolts
To make a pipe with a loose bolt, if the circular part of the descending screw part does not use welding if the batch processing can be used to forge processing into a whole.
As long as a few pieces, you can use round steel simmering processing ring, threaded tie material can be selected 10 #, 20 #, Q235 production, but should not be used 16Mn, 35 # steel, slow cooling after welding, generally do not require heat treatment, as for the diameter should be calculated in small diameter, according to the material allowable stress, consider more than 1.3 times the safety factor. Rounding to standard threads.
To make a pipe with the elastic bolt, if the circular part of the descending screw part of the welding is not used, if the bulk processing can be used to forge processing into a whole.
If only a few pieces, you can use round steel simmering processing ring, threaded tie material can choose 10 #, 20 #, Q235 production, but should not choose 16Mn, 35 # steel, welding after slow cooling, generally do not require heat treatment, as for the diameter should be calculated in small diameter, according to the material allowable stress, consider more than 1.3 times the safety factor. Rounding to standard threads.
The eyebolt should be made of 20 or 25 steel according to GB699 and must be forged and normalized as a whole.
Can understand your boss, the standard length is not enough, generally for their own processing. But the pipe hanger selection hanger ring is appropriate? You did not say the site conditions, I can not make a comment. Forging is certainly not done, normalized treatment will be a little higher heating temperature, right, heated to 860 degrees Celsius, insulation after the use of forced ventilation cooling. But do not water-cooled. 2T of weight, taking into account the upper time suspension, safety during the bolt diameter M30 ~ M36 enough
It is only 2 tons, just find a thicker bar material, mill a double plane and then drill chamfering, the rest of the M36 threads according to the required interception length. Even if you waste some material and how much it can cost ah. Since the decision to process their own does not consider whether to meet the requirements of the standard parts, do not need to take the standard of the ring to find trouble for themselves and do not need heat treatment, this thing is just called the name of the ring, or you simply change the name of the tie rod who can not pick your fault too, 25 steel M36 as long as the lifting angle vertical lifting a 4 tons are fine. Heated bend round ring instead of bad, not much safer than welding.
2. Briefly describe the processing technology and technical requirements of the eyebolt
The eyebolt is made of 20 steel and 25 steel, Q235, etc.; it shall be forged as a whole and treated by normalizing and removing the oxidized skin; the grain size of the finished product is not less than 5; the forging is free from overburning and cracking defects; the eyebolt shall be tested for hardness, and the hardness value is HRB67~95.
The thread tolerance of the eyebolt is 6g; the surface is generally not surface treated, but according to the requirements of use, surface treatment such as galvanization and chrome plating can be carried out. In the sign position of the eyebolt, the material brand and the trademark or identification mark of the manufacturer should be marked.
The maximum lifting weight, axial load and forging defect tolerance of the eyebolt.
Requirements for the use of eyebolts: The maximum lifting weight values in the table apply only to the installation of eyebolts in steel, cast steel or gray cast iron parts. The eyebolt must be screwed in until the support surface fits tightly, but no tooling is allowed. Loads perpendicular to the plane of the ring are not permitted. When using the way of "double screw lifting", should ensure that the two rings plane in the same plane, for this purpose, can be put on the support surface shim; the steel cable angle should not be greater than 90 °.
3. The purchase principle of the eyebolt
The eyebolt is the bolt that both ends are silked teeth in the middle of the light pole, this eyebolt is generally installed in some small and medium-sized equipment. The use rate of this double-headed bolt is actually very low. The actual bolt is a very good choice for the purpose of the actual bolt. The actual bolt is a good way to get the most out of the bolt.
The bolt is really a kind of containment medium to use, is flush with the full circulation and is straight, this time the pressure loss of the medium transport is reduced to a minimum. The bolt is generally applicable to the scenario that there is no need to open and close often, and it is possible to connect the gate plate flush open or flush closed. Bolts are generally not suitable for use as regulation or reduction. There are some of the characteristics of the bolt is also its characteristics.
Then dealing with some of the lower speed activity of the media is very fast in the gate plate partial opening scenario can cause some small vibration of the gate. This vibration can probably hurt the gate and the gate and the valve seat of the closed open surface, assuming that the adoption of the circle of reduction will make the gate attacked by the media. Here to emphasize the point is the form of the adopted dense open element. In accordance with the form of the sealing element as generally can be divided into a variety of different types of gate valves. In the present day, there are many classifications of bolts.
Ordinary bolts generally need to add some preload and to ensure that the working load maintains the rigidity of the connection of the body, in the mechanical design manual can be found on the recommended preload torque value, so that the load capacity of the bolt should be reduced accordingly (the actual bearing capacity of the original bearing capacity minus the preload value), the screwing torque of the eyebolt is not specific requirements, screwing against the line as long as to ensure that it does not fall off does not need to be preloaded. Loading and, in this way, can give full play to the bearing capacity of the eyebolt.