Views: 329 Author: Site Editor Publish Time: 2020-06-16 Origin: Site
Sheet metal V Grooving Machine processing is an indispensable part of mechanical processing, especially in aviation, home appliances, automobiles, elevators and other industries, sheet metal parts are widely used. The bending process is the only single-step forming process in sheet metal processing, and it is the most important process in sheet metal processing
One, the quality of the bending process will directly affect the forming size and appearance of the product. Therefore, how to ensure the forming size and angle of the workpiece in the bending process is an important research content in the bending process.
With the development of economy and the improvement of people's living standards, people's sense of pursuit is also increasing. In some high-end metal decoration, the more complicated the shape of the metal sheet jewelry bending, the more it reflects the designer's design level
And trendy style, thereby attracting the attention of customers. At the same time, the workpiece must meet the technological requirements of the bending radius of the bending edge as small as possible, no creases on the surface of the workpiece, and no indentation on the decorative surface. Traditional bending machine bending has been unable to achieve this
Special process requirements, therefore, the process of grooving and bending on metal plates came into being. This article mainly talks about the characteristics and grooving methods of the grooving process, and how to ensure the bending size and angle during the bending process.
Traditional bending methods and their limitations
The traditional bending process of the V Groover Metal Forming Machine is to use the two edges at the opening of the lower mold and the top of the upper mold under the pressure of the upper and lower molds of the CNC Press Brake
The edge of the metal sheet is bent, and the metal sheet is elastically deformed to plastically deformed. Its bending angle
The degree is determined by the depth of the upper die into the lower die, the bending radius R ≥ plate thickness t (Figure 1). In today's society, people
Our requirements for the shape of the workpiece are getting higher and higher,-some complex-shaped workpieces are shown in Figure 2, using traditional free
Bending, bending machine bending and even three-point bending process can no longer be bent, and traditional bending methods cannot be controlled
The radius of the bending corners makes it difficult to achieve the process requirements of seamless bending. Therefore, an emerging bender------planing groove bending technology came into being.
Process characteristics of planing and bending 1
The grooving and bending process is a kind of process of first scoring V-groove at the position where the metal sheet needs to be bent by using the, and then bending according to the demand on the ordinary bending machine. The characteristics of the slotting and bending process mainly include the following three aspects.
The arc radius of the edge of the workpiece is small, and the workpiece has no creases
It can be seen from the bending process that the radius of the edge arc after the workpiece is bent is proportional to the thickness of the plate. The thicker the plate, the greater the radius of the arc formed by the bending. After V-grooving the metal plate, the remaining thickness of the plate becomes one-half of the original, or even smaller,
This can greatly reduce the radius of the edge arc after the workpiece is bent. Also, because the remaining plate thickness at the bending position after grooving is thin, the deformation force during bending will be reduced accordingly, and will not affect the unbent area, so there is no crease on the surface of the workpiece after bending, and due to the bending
The thickness of the plate at the bend is thin, and the reduction in pressure required during bending avoids the risk of indentation on the decorative surface. In this way, it can meet the metal decoration of high-end places such as hotels, banks, commercial centers, airports, etc., the radius of the arc of the edge of the workpiece is small, the surface has no creases, and the decorative surface
No indentation is required.
Reduced tonnage of equipment required for sheet bending
In the bending process, the required bending force of the metal sheet is proportional to its thickness. The greater the thickness of the metal sheet, the greater the bending force required, and the required tonnage of the equipment also increases accordingly. After the V-shaped groove is made at the bending position of the metal plate before bending, the remaining thickness of the plate is large
Great reduction, so that the bending force required when the plate is bent will be reduced accordingly, so that the thick plate can be bent on a smaller tonnage bending machine. This not only reduces the investment in equipment, but also saves energy and space.
Bending of complex-shaped workpieces and control of resilience
The part shown in FIG. 2 cannot be bent and formed on a general bending machine, but it can be bent and formed by manually bending the V-groove at the bending place. In addition, the method of controlling the remaining thickness of the board can be used to achieve the resilience and resilience
Control of projectile angle. If the remaining board thickness after grooving is controlled at about 0.3mm, the rebound angle can be made very small, and the rebound can be basically ignored.
V-groove slotting method
In the production of sheet metal, gantry planers and sheet metal slotting machines are commonly used to slot V-shaped metal sheets. Put the plate to be grooved and bent on the slotting machine for positioning, and then input the thickness of the plate to automatically plan the groove. When grooving by the CNC V Groove Machine, pay attention to the following two aspects.
Slotting depth and remaining thickness settings
In the case of a certain plate thickness, the groove depth and the remaining thickness are a corresponding value. According to the bending process requirements, a remaining thickness value is first set. The default value is generally set to 0.8mm, and the minimum should not be less than 0.3mm. Then set the number of passes and the depth of penetration according to the thickness of the plate degree. Because of the need to control the burr and protect the tool, the amount of feed should not be too large. Generally, the depth of the first slot should not exceed 0.8mm, and it must be divided into at least two knives. For example, a stainless steel plate with a plate thickness of 1.2 mm and a plate thickness margin of 0.5 mm after slotting
To plan the groove, the first knife is set with a 0.5 mm feed, and the second knife is set with a 0.2 feed. After two knives, the remaining amount is just 0.5mm, and the burr is relatively small, as shown in Figure 3.
Slotting angle setting.
It can be seen from the bending process that when the metal sheet is bent and formed, it has different degrees of rebound deformation, which causes a deviation in the bending angle. When the V-shaped groove is opened, the groove can be rationalized according to the required bending angle of the workpiece. General V-groove
The slotting angle should be 1°~2° larger than the bending forming angle. For example, when bending a 90° workpiece, the V-groove angle can be opened to 92° (Figure 4)
so that bending can be avoided well. The angle error caused by the rebound (Figure 5).
Groove knife selection and quantity setting
Types and selection of groove cutters
The types of grooving cutters of CNC Stainless Steel V Grooving Machine are mainly divided into diamond-shaped grooving cutters, square grooving cutters, triangular grooving cutters, round grooving cutters, etc. (Figure 6). When grooving, the appropriate cutter can be selected according to the different shapes and angles of the V-groove. When planing an ordinary V-shaped groove, the angle of the tool should be smaller than the angle of the V-shaped groove. example
If the V-groove angle is 45°~60°, the grooving knife with a rhombic apex angle of 35° should be selected. When the angle is 60°~80°, a regular triangular grooving knife should be selected. When the angle is 80°~90°, a diamond shape should be selected. Groove knife with vertex angle of 80°, square groove knife should be selected when the angle is greater than 90°, when it is round groove
Use A Round Slotted Knife.
Sheet Metal V Groove Machine Tools Quantity Setting
When deep grooving a long-sized plate, the continuous grooving path of a single tool is long, which may cause problems such as overheating and wear of the tool, poor grooving effect, and large burrs. For example, when grooving 2mm stainless steel with a length of 2m, if the first knife feed Set to 0.5mm, continuous planing 2m, the tool will become soft due to excessive heat, the hardness of the planing groove after 1.5m will be reduced, and the burr will increase; if the feed amount is 0 2mm, the planed 2mm V shape The groove needs to take 10 knives, which greatly affects the processing efficiency. Therefore, the ruler
When grooving long plates, in addition to setting the amount of feed, the number of tools that work simultaneously must also be set. In this case, generally 3 to 4 tools are used to work simultaneously (Figure 7). The infeed amount differs by about 2mm, if the first-infeed amount is 5mm, then
The infeed of the second, third and fourth tools are 7mm, 9mm and 11mm respectively. This can not only ensure the quality of the planing, but also improve work efficiency.
How to avoid the deviation of bending angle and size
For the bending process, the quality of the bending is mainly determined by the two important parameters of the bending angle and size. When bending, in order to ensure the forming size and angle of bending, it is necessary to pay attention to the following issues.
(1 The upper and lower molds are not concentric with each other, which will lead to errors in the bending size. Before bending, the upper and lower molds need to be aligned.
(2) After the left and right positions of the rear block are moved, the relative position of the sheet and the lower die may change, which affects the bending size. The position distance of the rear block should be re-measured before bending.
(3) The parallelism between the workpiece and the lower die is insufficient, which will cause bending springback and affect the bending angle. Before bending, it is necessary to measure and adjust the parallelism.
(4) When the primary bending angle is insufficient, the secondary bending will also be affected. The accumulation of bending errors will lead to an increase in the forming dimensions and angle errors of the workpiece, so it is particularly important to ensure the accuracy of unilateral bending.
(5)When bending, the size of the lower die V port is inversely proportional to the bending pressure. When processing metal plates of different thicknesses, it is necessary to select the appropriate lower die China V groove Machine according to the regulations. Generally, 6 to 8 times the plate thickness is the most Suitable.
(6) When the workpiece is bent on the bending machine after planning the V-shaped groove, make sure that the upper die edge, the bottom edge of the V-shaped groove of the workpiece and the bottom edge of the V-shaped groove of the lower die are on the same vertical plane.
(7) When bending the workpiece after grooving, in order to prevent the clamping of the knife, the upper die angle is preferably controlled at about 84°.
Stainless Steel CNC V Groove Machine Conclusion
As a new processing technology in the bending process, the planing process is the result of market selection. With the continuous development of process technology, enterprises have higher and higher requirements for process personnel. As craftsmen, only by mastering various processing techniques can we produce better
Good products: Only continuous exploration and pursuit of new processes can produce more excellent products. The market competition is not for the weak, and can only be eliminated without innovative breakthroughs.