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Teach you how to choose the right bending machine

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  When choosing the bending machine improperly,the production cost will rise,and the bending machine can not expect to recover the cost. Therefore,several factors need to be considered in decision-making.

  The first important thing to consider is the parts you want to produce. The point is to buy a machine that can complete the processing task with the shortest worktable and the smallest tonnage.

  Carefully consider the material grade and the maximum machining thickness and length. If most of the work is mild steel with a thickness of 16 gauge and a maximum length of 3 m,the free bending force does not have to be greater than 50 tons. However,if you are engaged in a large number of bottomed die forming,maybe a 160 ton machine tool should be considered.

  Assuming the thickest material is 1 / 4 inch,200 tons are required for 10 foot free bending,and at least 600 tons are required for bottom die bending (correction bending). If most of the workpieces are 5 feet or shorter,the tonnage is almost halved,thus greatly reducing the purchase cost. The length of the parts is very important to the specification of the new machine.

  Under the same load,the deflection of the worktable and slide of the 10 foot machine is four times that of the 5 foot machine. This means that shorter machines require less shimming to produce qualified parts. The reduction of gasket adjustment shortens the preparation time.

  When free bending is adopted,the bending radius is 0.156 times of the opening distance of the die. In the process of free bending,the die opening distance should be 8 times of the metal thickness. For example,when 1 / 2 inch (0.0127 m) opening distance is used to form 16 gauge mild steel,the bending radius of the part is about 0.078 inch. If the bending radius is about as small as the thickness of the material,

  It is necessary to form with bottom die. However,the pressure required for forming the bottom die is about 4 times larger than that for free bending.

  If the bending radius is less than the thickness of the material,the punch with the front corner radius less than the thickness of the material shall be used,and the stamping bending method shall be used. In this way,10 times the free bending pressure is required.

  As far as free bending is concerned,punch and die should be processed at 85 ° or less (small point is better). When using this group of dies,pay attention to the gap between punch and die at the bottom of the stroke,and the excessive bending enough to compensate for springback and keep the material about 90 degrees.

  Generally,the springback angle of the free bending die on the new bending machine is less than 2 ° and the bending radius is equal to 0.156 times of the die opening distance.

  For the bottom die bending,the die angle is generally 86 ~ 90 °. At the bottom of the stroke,there should be a gap slightly larger than the material thickness between the punch and die. The forming angle is improved because the bending tonnage of bottomed die is large (about 4 times of free bending),which reduces the stress which usually causes springback within the bending radius.

  The stamping bending is the same as the bottom die bending,except that the front end of the punch is processed into the required bending radius,and the gap between the punch and the bottom of the stroke is less than the material thickness. Since sufficient pressure (about 10 times of free bending) is applied to force the front end of the punch to contact the material,springback is basically avoided.

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