A reamer is a sizing tool whose diameter and manufacturing quality directly affect the precision and roughness of the hole being machined. The diameter and tolerances of the reamer should be established to ensure that the high-quality holes are articulated and that there is sufficient reserve for regrind while being easy to manufacture. In the past, our factory selected reamer manufacturing tolerances, regardless of whether high-speed steel reamer or carbide reamer were selected according to national standards, namely the nominal size of the reamer is the nominal size of the hole being machined, the upper reamer deviation to take Workpiece hole tolerance 1/5, while the lower deviation is 3/5. According to many years of practice, according to this standard for manufacturing carbide reamer, the following problems exist in the hole of the hinged hole: 1 The processed hole is generally small, especially the thin-walled part and the softer material part, the hole that is hinged out. There is a shrinkage phenomenon; 2 The reamer has a small amount of grinding, the use of one for scrap, a waste of large; 3 Because the reamer manufacturing tolerances vary according to the size of the workpiece hole tolerance, so that the reamer for the manufacture of lower precision holes The manufacturing tolerances are relaxed so that the service life of the reamer is reduced. 1 Analysis of Reaming Process and Principle of Reaming Tolerance Under normal conditions, due to the eccentricity of reaming, the reaming tool teeth beat to the center, the teeth of the reamer are not balanced, and there is clearance and guidance in the tool guiding portion. Partially out of round and other reasons, the reamer shakes during machining, coupled with the phenomenon of knife aneurysm and the like during the reaming process, so the hole through the hinge may be relatively large. On the other hand, since the calibration part of the reamer has been repaired in the reaming hole and has been processed and guided by the reamer, the repair of light here not only has the effect of cutting a small amount of metal, but also has the effect of squeezing, considering that the workpiece is Under the effect of cutting and squeezing, elastic deformation and thermal deformation take place. These deformations will recover after machining, so there is shrinkage of the hole after reaming. Under different conditions, the "expanding" and "shrinking" are different, so the amount of expansion is different. In general, the expansion and contraction of the hole are related to many factors such as the workpiece material, the amount of remaining, the amount of cutting, the wall thickness of the workpiece, the geometry of the reamer, and the temperature. Therefore, the size of the reamer must be determined according to the specific conditions of the processing. Reamer manufacturing tolerances, where possible, are expected to be smaller to increase the life of the reamer. In the production of our factory, carbide reamers are generally used for machining cast iron and low- and medium-carbon steels and have tool guiding devices. In sharpening, the hard alloy reamer edge is not as sharp as the high-speed steel reamer edge. Practice has proved that when the carbide reamer is used to process the above materials, shrinkage generally occurs after reaming. Therefore, the expansion of hard alloy reamers manufactured according to national standards is generally large. In the case of a hole with less than two degrees of accuracy in the hinge, the tolerances of the reamer to be taken in accordance with the standard are relatively large, which, although more economical to manufacture, reduces the amount of grinding of the reamer and reduces the service life. Based on many years of experience, our factory can manufacture reamers with hinged two-stage precision holes more economically without loosening manufacturing tolerances. 2 Recommended manufacturing tolerances for the carbide reamer produced by our factory. Value of the hinge's secondary accuracy. Hole reamer, Nominal dimension Take the nominal size of the reaming hole. The upper deviation is 0.8 times the tolerance of the workpiece hole (0.2 times remaining) ) The amount of expansion, while the reamer manufacturing tolerances to take the workpiece hole tolerance of 0.25 times. Reaming accuracy of the following requirements for the hole with a reamer, the nominal size of the reamer to take the nominal size of the workpiece hole, the reamer of the deviation to take the workpiece hole tolerance of 0.8 times, and the manufacturing tolerances to take the corresponding nominal size is the hinge level precision hole With reamer manufacturing tolerances. After 2 years of verification, the reamer manufactured by our factory based on the above experience is considered to be feasible.
Double Girder Gantry Crane With Winch
Both the end of horizontal and vertical rail are equipped with Limit Switch and baffle to avoid the dropping of the main engine.
The internal friction clutch of the hanging machine can lead to the motor idling when over weight hanging and prevent the machine body and load chain from damage.
The upper and lower limit switches will be immediately prompted to stall the motor when over weight lift. Also, there is overheating protection device to protect the motor from overheating and burning.
The emergency stop button will make the whole system power failure and will be restarted manually.
Double Girder Gantry Crane With Winch,Load Gantry Crane,Trolley Hook Gantry Crane
Eurocrane (China) Co., Ltd. , https://www.overhead-crane.com