Under the same bolt area, the choice of bolts and ancho […]
Under the same bolt area, the choice of bolts and anchor bolts for the equipment flange is still a little different:
Generally, the flange is selected with a small diameter and a large number. The main consideration is to be more conducive to sealing.
Anchor bolts have a large diameter and a small number, and the main consideration is the convenience of field installation.
Anchor bolts: When mechanical components are installed on concrete foundations, the J-shaped and L-shaped ends of this bolt are buried in the concrete for use.
The tensile capacity of the anchor bolt is the tensile capacity of the round steel itself. The size equal to the cross-sectional area multiplied by the allowable stress value (Q235B: 140MPa, 16Mn or Q345: 170MPA) is the allowable tensile bearing capacity during design.
Anchor bolts are generally made of Q235 steel, which is round. Rebar steel (Q345) has high strength, and it is not easy to make nut rounds. For light round anchor bolts, the buried depth is generally 25 times its diameter, and then a 90-degree hook with a length of about 120mm is made. If the bolt diameter is very large (such as 45mm) and the buried depth is too deep, you can weld a square plate at the end of the bolt, that is, make a large head (but there are certain requirements). The burial depth and the hook are to ensure the friction between the bolt and the foundation, so that the bolt will not be pulled out and damaged.
First, you need to determine the drawing requirements for submitting the bolt, and the production batch. If mass production requires a sawing machine, a lathe, or a spinning machine. Single small batches can be directly turned on the lathe. In addition, it is necessary to pay attention to the requirements of paper. For heavy-duty machine tools and other high-precision requirements, the weight is often required to submit bolts for quenching and tempering. The high-strength bolt processing technology is: hot-rolled wire rod-(cold dial)-nodularization (softening) annealing-mechanical descaling-pickling-cold dial-cold forging-thread processing-heat treatment-inspection
There are many types of double-headed screws (bolts, posts). According to the direction of rotation of the two-headed screw, there are two types of co-direction and reverse.