Synchronizer of the hottest bending machine

The bending machine in this section is divided into manual bending machine, hydraulic bending machine and numerical control bending machine

according to the synchronization mode, the hydraulic bending machine can be divided into: torsional shaft synchronization, mechanical hydraulic synchronization, and electro-hydraulic synchronization

according to the movement mode, the hydraulic bending machine can be divided into up moving type and down moving type

it includes a support, a workbench and a clamping plate. The workbench is placed on the support. The workbench is composed of a base and a pressing plate. The base is connected with the clamping plate through a hinge. The base is composed of a base shell, a coil and a cover plate. The coil is placed in the depression of the base shell, and the top of the depression is covered with a cover plate

when in use, the coil is powered on by the wire, which generates gravity on the pressing plate, so as to realize the clamping of the thin plate between the pressing plate and the base. Because of the electromagnetic force clamping, the pressing plate can be made into a variety of workpiece requirements, and the workpiece with side wall can be processed. The bending machine can meet the needs of various workpieces by replacing the bending machine mold

working principle of Ju CNC bending machine the bending machine in this section includes a bracket, a workbench and a clamping plate. The workbench is placed on the bracket. The workbench is composed of a base and a pressing plate. The base is connected with the clamping plate through a hinge. The base is composed of a base shell, a coil and a cover plate. The coil is placed in the recess of the base shell, and the top of the recess is covered with a cover plate. When in use, the coil is powered on by the wire, and after being powered on, it generates gravity on the pressing plate, so as to realize the clamping of the thin plate between the pressing plate and the base. Because of the electromagnetic force clamping, the pressing plate can be made into a variety of workpiece requirements, and the workpiece with side wall can be processed, and the operation is also very simple. Selection of bending machine the prospective buyer in this paragraph should carefully consider what to buy from the end use of the machine, the possible deflection of the known machine, the bending radius of the parts, etc. before paying

workpiece

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

carefully consider the material brand and the maximum processing thickness and length. If most of the work is low carbon 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 (correction bending). If most of the workpieces are 5 feet or less, the tonnage will be almost halved, thus greatly reducing the purchase cost. The length of parts is very important to determine the specifications of new machines

deflection

under the same load, the deflection of the workbench and slider of the 10 foot machine is four times that of the 5-foot machine. That is to say, shorter machines need 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 by stainless steel is usually increased by about 50%, while that of most grades of soft aluminum is reduced by about 50%. You can get the tonnage table of the machine from the bending machine manufacturer at any time, which shows the tonnage estimation required per foot length under different thickness and different materials

bending radius of parts

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 should be 8 times the thickness of the metal material. For example, when forming 16 gauge mild steel with an opening of 1/2 inch, the bending radius of the part is about 0.078 inch. If the bending radius is almost as small as the thickness of the material, it must be formed by a bottom die. 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 thickness of the material, the punch with the front fillet radius less than the thickness of the material must be used, and the embossing bending method is resorted to. In this way, 10 times the pressure of free bending is required

in terms of free bending, punch and die are processed 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 that is sufficient to compensate for the rebound and keep the material at about 90 °

generally, the springback angle produced 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 female die

for the bending of bottomed female die, the die angle is generally 86 ~ 90 °. At the bottom of the stroke, there should be a gap slightly greater than the thickness of the material between the male and female dies. The micro Vickers hardness test is mainly used for metallurgic and metallographic research, and the shape angle can be improved, because the tonnage of the bottom die bending is large (about 4 times that of the 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 parts and their future use

accuracy

bending accuracy requirements are 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, and such accuracy and good mold must be used for the precise angle of forming. 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 mold. In addition, CNC bending machine is ready for rapid mold installation. When you need to bend many small batch parts, this is an unquestionable reason to consider

molds

even if you have full shelves of molds, don't 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 should be about ± 0.001 inch, and the total length deviation should not be greater than ± 0.005 inch. As for the precision grinding die, the accuracy per foot should be ± 0.0004 inch, and the total accuracy should 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

the side length of the bending part

is assumed to be along a 5 × The 10 foot 10-g is a closed-loop servo control system composed of electrical controller, servo valve, load sensor, displacement sensor and computer. Auge low carbon steel plate is bent 90 °, and 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 280 pound straight edge to fall. Manufacturing this 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 kind of 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 this device, forming long side parts requires only one person to operate. Usage of bending machine this section briefly introduces the processing of Q235 sheet metal by ordinary hydraulic bending machine:

1. First, turn on the power supply, turn on the key switch on the control panel, and then press the oil pump to start, so that you can hear the rotation sound of the oil pump. (at this time, the machine does not act)

2. Stroke adjustment. When using the bending machine, you must pay attention to adjusting the stroke, and you must test run before bending. When the upper die of the bending machine goes down to the bottom, there must be a gap of plate thickness. Otherwise, the mold and machine will be damaged. The adjustment of stroke also includes electric quick adjustment and manual stomach adjustment

3. For the selection of bending notch, it is generally necessary to select a notch 8 times the width of the plate thickness. If you bend a 4mm plate, you need to select a notch of about 32

4. The adjustment of the rear stopper generally includes electric quick adjustment and manual fine adjustment, and the method is the same as that of the plate shears

5. Press the foot switch to start bending. The bending machine is different from the plate shearing machine. It can be loosened at any time. When the foot is loosened, the bending machine will stop and continue to descend after stepping. Bending machine safety operation regulations this paragraph 1 Strictly abide by the safety operation regulations of machine tool workers, and wear labor protection articles as required

2. Before starting, carefully check whether the motor, switch, circuit and grounding are normal and firm, and check whether the operating parts and buttons of the equipment are stuck in the correct position

3. Check the coincidence and firmness of the upper and lower molds; Check whether each positioning device meets the requirements of being processed

4. When the upper sliding plate and each positioning axis are not at the origin, run the procedure of returning to the origin

5. After the equipment is started, it will run idle for minutes, and the sliding plate will run for times in full stroke. If abnormal sound or fault is found, it should be stopped immediately, and the fault should be eliminated. It can work only after everything is normal

6. During work, one person shall be responsible for unified command, so that the operator can closely cooperate with the feeding and pressing personnel to ensure that the cooperating personnel are in a safe position before sending bending signals

7. The sheet metal must be compacted during bending to prevent the sheet metal from cocking up and hurting people during bending

8. The power supply must be cut off during the die pressing of the seasoning material, and it can be carried out after the operation is stopped

9. When changing the opening of the variable lower die, no material is allowed to contact the lower die

10. When the machine tool is working, no one is allowed to stand at the rear of the machine tool

11. It is strictly forbidden to press the folded plate at one end alone

12. If the workpiece or mold is found to be incorrect during operation, it should be stopped for correction. It is strictly forbidden to correct by hand during operation to prevent hand injury

13. It is forbidden to fold over thick iron plates or quenched steel plates, high-grade alloy steels, square steels and plates that exceed the performance of the plate bending machine, so as to avoid damaging the machine tool

14. Regularly check the coincidence of upper and lower molds; Whether the indication of the pressure gauge meets the requirements

15. Stop the machine immediately in case of abnormality, check the cause and eliminate it in time

16. Before shutdown, place wooden blocks on the lower formwork under the oil cylinders on both sides and lower the upper sliding plate onto the wooden blocks

17. Exit the control system program first, and then cut off the power supply. Maintenance and repair of bending machine in this section, before the maintenance or cleaning of the machine tool, the upper mold should be aligned with the lower mold, and then put down and shut down until the work is completed. If you need to start the machine or other operations, you should select the mode in manual and ensure safety. The maintenance contents are as follows:

1. Hydraulic oil circuit

a. check the oil level of the oil tank every week. If the oil level is lower than the oil window, add hydraulic oil

b. the hydraulic oil used in this machine is ISO HM46 or Mobil dte25

c. the oil should be changed after the new machine works for 2000 hours, and after every 4000 ~ 6000 hours, the oil tank should be cleaned every time the oil is changed

d. the system oil temperature should be between 35 ℃ ~ 60 ℃ and should not exceed 70 ℃. If it is too high, the oil quality and accessories will deteriorate and be damaged

2. Filter

a. the filter should be replaced or thoroughly cleaned every time the oil is changed

b. the machine tool has relevant alarms or other abnormal filters such as dirty oil, which should be replaced

c. the air filter on the oil tank shall be inspected and cleaned every 3 months, and it is best to replace it once a year

3. Hydraulic components

a