Sheet metal processing technology is an important process for sheet metal product forming, mainly including laser cutting, heavy processing, bending forming, precision welding, and other process methods. CNC punching machine is a very common basic equipment in sheet metal processing. The practical application of CNC punching in metalworking technology is briefly discussed and analyzed.

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Application of sheet metal processing technology in
CNC punching machine
Written By Jasmine HL
Sheet metal processing technology is an important process for sheet metal product forming,
mainly including laser cutting, heavy processing, bending forming, precision welding, and other
process methods. CNC punching machine is a very common basic equipment in sheet metal
processing. The practical application of CNC punching in metalworking technology is briefly
discussed and analyzed.
Keywords: sheet metal processing technology; CNC punch; processing method; main advantages;
process
1 Introduction
The numerical control technology is the use of modern computer systems to control mechanical
equipment to realize the automatic processing of mechanical parts. With the rapid development
of science and technology, numerical control technology has been widely used in various
industries and has matured. NC punch is a very common mechanical equipment in the process of
sheet metal processing and has played an important role in improving the efficiency of sheet
metal processing. This article mainly analyzes the main technology of sheet metal parts CNC
machine tool processing and the possible failures during processing, and only provides references
for the practical application of related enterprises.
2.Machining methods and main advantages of CNC punching in sheet metal processing

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There are five processing methods for single-press punching, continuous punching, cannibalizing
processing, single or continuous forming processing, and array forming. The single punching
refers to the single completion of punching processing such as arc distribution and grid holes.
Continuous blanking is mainly divided into two types: continuous blanking in the same direction
and continuous blanking in the same direction. Generally, continuous blanking in the same
direction is mostly applied to the processing of elongated holes. During the processing,
overlapping molds are required. Multi-direction continuous punching is very suitable for
processing large holes with small abrasive tools. Nibble processing is mainly applied to the
continuous punching of small steps and small round dies. The single forming process is a shallow
drawing and one forming process according to the properties of the mold. Continuous molding is
mainly used when the molded product is larger than the size of the mold. When processing
multiple workpieces on a large plate at the same time, an array forming method is mainly used.
Multiple workpieces processed simultaneously can be of different types.
The use of numerically controlled punches in sheet metal processing has very obvious advantages.
It is relatively simple to use at first, and the production cost is relatively low. It can automatically
complete the processing of some complex shaped parts or thin plate parts. In the actual
production process, according to the design drawings of the parts, it can automatically complete
the processing of holes with different sizes and shapes. The small punch can be used to punch
large holes and contours of various shapes in small steps and small punches. Processing of curves.
Sheet metal parts with special processing technologies such as flanging holes and shallow
drawing can be processed using some relatively simple molds. Compared with the traditional
punching method, the use of CNC punching machine for sheet metal processing, the mold is
relatively simple, but the processing range has increased significantly, the processing capacity and
efficiency have also been significantly improved, in a variety of forms or larger batches of sheet
metal The processing process is very practical, can meet the current market development pace
and the market's actual demand for products, and because of the high processing efficiency and
simple use, the processing cost of processing enterprises is significantly reduced, which is very
beneficial to improve the economic benefits of enterprises.
Secondly, when using CNC punching for sheet metal processing, the accuracy is high and the
quality of the product is very stable. The CNC punching machine has good flatness, high precision
of punching, less burrs during sheet metal processing, and the quality of the formed product is
very stable. Finally, during the CNC punching process, the computer control system of the
machine tool can monitor the process of sheet metal processing at any time, and timely feedback
various problems of workpiece processing, and then take corresponding measures to effectively
reduce the product's Failure, the processing speed is relatively fast, and the use of CNC punching
machine, can practice the small batch of workpieces and different parts of the simultaneous
processing, can also effectively improve the processing efficiency of the workpiece. Under the NC
integrated machining mode, many subsequent processing steps are not required in the
traditional stamping process, and the production efficiency will naturally be effectively improved,
thereby reducing the production cost.

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3. The main process of stamping sheet metal parts with CNC punch
A. Processing technology of cutting first and then processing
Before blanking, the relevant staff first need to cut the board with a shearing machine according
to the external dimensions of the part, and then they can cut the blank, and then edit the NC
program and enter it into the control system to enter the processing stage of the part.
Take the processing of a single sheet metal panel part as an example. During the processing, it is
necessary to trim it first. To ensure that the four sides of the panel part have good
perpendicularity, in order to prevent the workpiece from shifting, the parts of the CNC punch
press are needed Hold firmly. If the size of the large plate is 2500mm × 1250mm and the size of
the rectangular sheet metal panel part after processing is 410mm × 400mm, then the large plate
can process 18 rectangular plates of 410mm × 400mm. In general, the material utilization rate
can be It reaches 94.5%. Generally speaking, the time for blanking a single part is about 30s, and
the total blanking process of 18 pieces takes about 9min. After blanking, the factory staff needs
to place the cut sheet on the CNC punch. Each sheet needs to be processed by 6 kinds of molds,
and has undergone 93 stampings. In addition, the time of workpiece loading and unloading, each
workpiece The processing time is about 1min.
B. Stamping process
When punching and cutting, 18 parts need to be neatly arranged on the entire large plate, and
then the 18 parts are cut and separated by the rectangular mold of the CNC punch. In order to
prevent the parts from falling, you need to prepare Leave some unconnected to ensure that the
entire board is still in an integrated state. After the clamping is completed, due to the rectangular
mold between the various parts, the gap between the parts needs to be considered. In general,
the gap between adjacent parts is about 5r am. In this case, the utilization rate of the entire plate
is between About 94%. As an additional set of rectangular molds is used, 7 types of molds are
generally required when using this processing technology. In the process of part connection
cutting, the rectangular mold needs to be punched 360 times, and each workpiece needs to be
punched 2034 times. The entire stamping weighs about 12r a in. Relatively speaking, the
precision of the stamping and cutting process is relatively low, and during the roundabout
processing, the upper and lower disks of the machine tool may have coil failures, which has
certain safety risks. Therefore, when using this processing technology, the cutting speed is
generally Relatively low. In addition, there is a certain amount of unconnected parts during the
processing of the parts, so there will be burrs at the joints. After the processing is completed,
they must be polished.
4.Failures that may occur when sheet metal parts are punched by CNC punch
A. Crush
When there are sundries in the surface of the material, the cutter, and the turret of the cutter
head, the gap between the cutters is relatively large, and the program setting may be
unreasonable. Therefore, before the specific processing, the relevant staff need to check the
surface of the material, the cutter, and the cutter turret. If debris is found, it needs to be cleaned
with broken steps or air guns. When choosing the clearance of the lower mold, the thickness of

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the plate needs to be considered. If the tool has been ground, it must be demagnetized.
B. Deformation
Deformation is one of the more common failures in sheet metal stamping. The lower mold is too
low and the distance between the molds is too small may cause mold deformation. If the
problem of deformation of the sheet metal is found during the actual processing, the height of
the lower mold should be adjusted appropriately, and two higher lower molds cannot be installed
together at the same time.
C. Scratches
Scratches on materials, molds, and manual loading and unloading of workers may cause sheet
metal parts to be scratched. According to the relevant quality standards, severely scratched
materials and molds must not be used. In order to avoid material damage due to human reasons
and unnecessary losses, it is best to be completed by two staff members during loading and
unloading. When burr grinding, the workpieces cannot be ground together. When storing the
workpiece, it is necessary to ensure that it is placed neatly and smoothly, and the height is
suitable to avoid collapse and damage to the workpiece.
5.Conclusion
NC punch is one of the basic equipment for sheet metal processing. This article mainly introduces
the main processing technology, processing characteristics and faults that may occur during the
processing of NC punch in sheet metal processing. It is only the CNC machine tools of related
enterprises. The practical application provides simple references.