The choose and buy stainless steel bending machine needs attention
choose stainless steel bending machine must pay attention to?first, artifacts: the first thing to consider is what you want to production parts. The key is to buy a can finish machining task and workbench, the tonnage of the smallest shortest machine. Carefully consider material brand and the maximum thickness and length. If most of the work is thickness for 16 and a maximum length of 10 feet of low carbon steel, free bending force does not need to more than 50 tons. But, if you are engaged in a large number of bottom die forming, maybe you should think about 160 tons of machine tools. Well, suppose the thickest material is 1/4 ', 10 feet free bending need 200 tons, and at the bottom of the cavity die of bending ( Calibration curve) You need at least 600 tons. If a majority of the workpiece is equal to or less than 5 feet, tonnage almost halved, so as to greatly reduce the purchasing cost. The length of the parts is very important for decision of the specifications of the new machine. The second, deflection, under the same load, 10 feet of the machine the workbench and the deflection of slider is five feet four times the machine. That is, the shorter the machines need less shim adjustment to produce qualified parts. Reduce the gasket adjustment also shorten the preparation time. Material level is also a key factor. Compared with low carbon steel, stainless steel usually required load increased about 50%, while most of the brands of soft aluminum required load by around 50%. You can always get the machine from bending machine manufacturers tonnage of table, the table shows the under different thickness and material of the tonnage per foot length. Third, parts bending radius: the free bending, bending radius of die opening distance of 0. 156 times. In the process of bending, cavity die opening distance should be 8 times the thickness of the metal material. For example, when the distance form the opening for 1/2 inch 16 low carbon steel, the bending radius of the parts is about 0. 078 inches. If the bending radius is almost as small as the thickness of the material, you must form a bottom die. However, forming a bottom cavity die of the required pressure is about free bending required 4 times. If the bending radius is smaller than the thickness of the material must be used before the punch radius is smaller than the thickness of the material, and punching bending method must be adopted. So, need 10 times free bending stress. In terms of free bending, the male die and female die processing temperature of 85 or less ( As small as possible) 。 Use this set of mold, pay attention to the clearance between punch and die at the bottom of the stroke, and is sufficient to compensate the springback and keep material in about 90 degrees of excessive bending. Usually, new bending machine free bending springback Angle less than or equal to twice the bending radius is equal to the die opening distance of 0. 156 times. For bending bottom concave die, die Angle is generally 86 degrees to 90 degrees. On the bottom of the stroke between punch and die there should be a slightly larger than the material thickness of the gap. In the large tonnage of a bottom die bending ( About four times that of free bending) Improved, so forming Angle, it reduces the usually causes the springback in bending radius range of stress. Punching bending and bending die cavity at the bottom of the same, just the front end of the male die is processed into the required bending radius, and the clearance between the punch and the die cavity in the bottom of the stroke is less than the thickness of the material. Because of the enough pressure ( About 10 times of free bending) To force the punch the front end of the contact materials, basically avoid the springback. In order to select the minimum tonnage specifications, the best plan is greater than the material thickness of the bend radius, as far as possible by free bending method. When bending radius is larger, the quality of the finished parts and the use of the future will not be affected. Fourth, degree: bending accuracy requirement is a need to carefully consider factors. It is this factor determines whether or not you need to consider the CNC bending machine or manual bending machine. If bending accuracy requirement is 1 and can not change, you must focus on nc machine tools. The repeat precision of CNC bending machine slider for & plusmn; 0. 0004 inches, precise forming Angle must adopt such precision and good mould. Repeat accuracy of manual bending machine slider for & plusmn; 0. 002 inches, and under the condition of using suitable mould will typically produce & plusmn; 2~3° The deviation. In addition, CNC bending machine to prepare for loading die quickly, when you need to bend, many small batch parts, it is a no doubt consider the reasons. Fifth, mould: even if you have a shelf full of mold, and don't think these tooling for new machines. Must by measuring the punch from the front to set the length of the shoulder and the die set between the shoulder length to check each mold wear. For the traditional mold, each foot of the deviation should for & plusmn; 0. Deviations should not exceed the total length of 001 inches, 0. 005 inches. As for fine grinding of mould, the precision of per foot should be & plusmn; 0. 0004 inches, total accuracy should not be greater than & plusmn; 0. 002 inches. CNC bending made using fine grinding mold, manual bending made using conventional mold. Sixth, bending length: suppose along a 510 - foot - 10 90 degrees of low carbon steel plate bending, bending machine must impose additional 7. 5 tons of pressure to boost steel plate, and the operator must be prepared to withstand 280 pounds of straight to fall.
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