Purchase knowledge
Application of workpiece NC bending machine hamenaco reducer fha-17c-160-e250-c
The first important thing worth considering is the parts you want to produce. The key 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 10 feet, 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, perhaps you should consider a 150 tonnage machine tool.
Well, assuming that the thickest material is 1 / 4 inch, 165 tons are required for 10 foot free bending, and at least 600 tons are required for bottom die bending (corrected bending). If most of the workpieces are 5 feet or less, the tonnage is almost halved, which greatly reduces the acquisition cost. Part length is very important to determine the specification of a new machine.
Application of flexure CNC bending machine hamenaco reducer fha-17c-160-e250-c
Under the same load, the deflection of the worktable and slider of the 10 foot machine is four times that of the 5-foot machine. This means that shorter machines require less gasket adjustment to produce qualified parts. Reducing shim adjustment also shortens the preparation time. Material grade is also a key factor. Compared with low carbon steel, the load required for stainless steel is usually increased by about 50%, while that for most grades of soft aluminum is reduced by about 50%. You can always get the tonnage table of the machine from the bending machine manufacturer, which shows the estimated tonnage required per foot of length under different thicknesses and materials.
Application of NC bending machine for bending radius of parts hamenaco reducer fha-17c-160-e250-c
When free bending is adopted, the bending radius is 0.156 times of the opening distance of the die. In the free bending process, the opening distance of the die shall be 8 times the thickness of the metal material. For example, when a 1 / 2-inch opening is used to form 16 gauge mild steel, the bending radius of the part is about 0.078 inch. If the bending radius is almost as small as the material thickness, bottom die forming must be carried out. However, the pressure required for forming a bottomed die is about 4 times greater than that for free bending.
If the bending radius is less than the material thickness, the punch with the front fillet radius less than the material thickness must be used, and the embossing bending method must be resorted to. In this way, 10 times the pressure of free bending is required.
For free bending, and machining at 85 ° or less (small points are better). When using this group of dies, pay attention to the gap between the punch and the die at the bottom of the stroke and the excessive bending sufficient to compensate for the rebound and keep the material at about 90 °.
Generally, the springback angle generated by the free bending die on the new bending machine is ≤ 2 °, and the bending radius is equal to 0.156 times of the opening distance of the die.
For the bending of bottomed die, the die angle is generally 86 ~ 90 °. At the bottom of the stroke, there should be a gap slightly greater than the material thickness between the male and female dies. The forming angle is improved because the tonnage of bottom die bending is large (about 4 times that of free bending), which reduces the stress that usually causes springback within the bending radius.
The embossing bending is the same as the bending of the bottom die, except that the front end of the punch is processed into the required bending radius, and the gap between the punch and the die at the bottom of the stroke is less than the material thickness. Since enough 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.
In order to select the lowest tonnage specification, it is best to plan for the bending radius greater than the material thickness, and use the free bending method as much as possible. When the bending radius is large, it often does not affect the quality of the finished part and its future use.
Application of precision CNC bending machine hamenaco reducer fha-17c-160-e250-c
The requirement of bending accuracy is a factor that needs careful consideration. It is this factor that determines whether you need to consider a CNC bending machine or a manual bending machine. If the bending accuracy is required to be ± 1 ° and cannot be changed, you must focus on the CNC machine.
The repetition accuracy of the slider of CNC bending machine is ± 0.0004 inch. Such accuracy and good die must be used for forming accurate angle. The repetition accuracy of the slider of the manual bending machine is ± 0.002 inch, and generally there will be a deviation of ± 2 ~ 3 ° under the condition of using a suitable die. In addition, CNC bending machine is ready for rapid mold installation. When you need to bend many small batch parts, this is an indisputable reason to consider.
mould
Even if you have full shelves of molds, do not think these molds are suitable for newly purchased machines. The wear of each die must be checked by measuring the length from the front end of the punch to the shoulder and the length between the shoulder of the female die.
For conventional molds, the deviation per foot shall be about ± 0.001 inch, and the total length deviation shall not be greater than ± 0.005 inch. For precision grinding molds, the accuracy per foot shall be ± 0.0004 inch, and the total accuracy shall not be greater than ± 0.002 inch. It is better to use fine grinding die for CNC bending machine and conventional die for manual bending machine.
Side length of bending part
Suppose along a 5 × The 10 foot 10 gauge low carbon steel plate is bent 90 °, the bending machine must apply an additional 7.5 tons of pressure to jack up the steel plate, and the operator must be ready for the straight edge falling of 280 pounds. Manufacturing the part may require several strong workers or even a crane. Bending machine operators often need to bend long side parts, but they don't realize how hard their work is.
Now there is a material supporting device suitable for workshops engaged in this kind of work, which can be improved according to the needs of new and old machines. With the device, the forming of long side parts only needs one person to operate.
The CNC system of bending machine generally uses E200 da41 da51 da53 da56 da65 da66
