Application of Punching Forming Die in CNC Servo Turret Punch Press Punching Machine

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Servo turret punch machine is a kind of equipment widely used in sheet metal processing. With the rapid development of the machinery manufacturing industry, laser cutting machines have replaced most of the servo turret punch in the market. Even so, servo turret punch Still has features that a laser cutter can’t. For some sheet metal products that need to be formed, laser cutting machines are not fully competent, such as rolling ribs, rolling steps, shutters, flanging, convex hulls and other processes still require the punching Forming Die processing of the servo turret punch, so for sheet metal processing , cnc Servo Turret Punch Press punching machine and punching Forming Die are still an indispensable part.

Servo turret punch machine
Servo turret punch machine

The charm of sheet metal lies in forming. Forming molds are widely used in elevators, air conditioners, anti-theft doors, chassis, skid plates and other sheet metal processing fields that require forming, with the advantages of flexibility, high efficiency and low cost. Compared with the ordinary punching die, the structure of the punching Forming Die is complex and the manufacturing process is complicated. The initial test punch of the punching Forming Die needs to continuously debug the die according to the forming condition of the workpiece until the workpiece that meets the requirements is punched out. Therefore, the production cycle of forming molds is long, and customers need to be informed in advance when customizing molds to avoid unnecessary contradictions when machine tools are delivered.

Punching forming die type

The punching forming dies on the servo turret punch mainly include roller dies, imprinting and profiling dies, shallow drawing dies, punching punching Forming Dies, flanging punching Forming Dies, knockout dies, extrusion punching Forming Dies, positioning shearing dies, etc. .

Roller mold

Roller molds include bead rolling molds and rolling step molds, which need to be placed on a rotating station to achieve the processing requirements of any curve shape, and there are no stamping marks on the plate. By installing the matched rollers on the upper die and the lower die of the die, the up and down movement of the roller and the left and right movement of the sheet metal part form a relative motion during the stamping process, so as to realize the forming of long ribs, and the length of the ribs is not limited by the die. Bead rolling dies and rolling step dies need to be determined with different forming heights and widths according to customer requirements. Such dies have a large range of stamping ribs, accurate positioning and high machining accuracy. At the same time, there are special requirements for the material and thickness of the workpiece. The stainless steel is generally 0.8-1.5mm, the carbon steel plate is generally 0.8-2.0mm, the aluminum plate is generally 0.8-2.5mm, and the forming height is 2-3 times the thickness of the plate, and the width is the height. 2 times, the maximum width is 12.7mm. The roller mold and forming are shown in Figure 1.

Roller die and forming
Figure 1 Roller die and forming

Stamping and scribing stencils

Imprinting and characterization molds include character code molds, imprinting molds, embossed character molds, and characterization molds. Using stamping dies and embossing dies, stamping can be formed on the sheet metal, which can be raised upwards or downwards. The use of stamping dies can help customers omit the reprocessing of parts such as labeling and painting, saving money and increasing effect. The profiling mold is a mold that engraves or dot matrix marks on the surface of the workpiece, which will not cause the shape of the sheet metal parts to change, nor will it cause indentation to affect the appearance. The spring can be adjusted to adapt to the processing of plates of different materials, and the forming direction is downward. on the rotating station. The stamping and profiling die and forming are shown in Figure 2.

Imprinting and profiling mold and forming
Figure 2 Imprinting and profiling mold and forming

Shallow drawing die

The shallow drawing die is mainly a convex hull punching Forming Die, which consists of a punch and a lower die. The forming height and angle of the convex hull punching Forming Die should not be too large, so as not to cause the joint to break. The convex hull punching Forming Die can cooperate with the pre-punching die to realize the requirements of forming through holes on the convex hull. The pre-punching die needs to finally determine the size of the hole according to the test punching results. The convex hull punching Forming Die is widely used. The water drop die is similar to the convex hull, and the array of water drop-shaped convex hulls is beautiful in style. The maximum plate thickness that can be processed is 1.5mm; 1.5mm. The shallow drawing die forming is shown in Figure 3.

Shallow drawing die forming
Figure 3 Shallow drawing die forming

Punching and punching forming die

Punching and punching Forming Dies include shutter dies, tongue dies, bridge dies and card dies. Punching and punching Forming Dies are mainly used for product ventilation, pipe clamping, decoration, etc. Louver dies are the most widely used, and louver dies are generally selected for parts that need heat dissipation, such as chassis, which are beautiful and practical; tongue-cutting dies are mainly used between sheet metal parts. The combined part is similar to the buckle; the bridge-shaped mold is used to insert the wire pipe, which is simple and convenient; the card-shaped mold is used for the installation port of the electrical components. The punching and punching Forming Die is mainly divided into two parts: punching and forming. The structure is complex and can meet most of the requirements of customers for products. The punching and punching Forming Die is formed as shown in Figure 4.

Punching and punching forming die forming
Figure 4 Punching and punching forming die forming

Flanging forming mold

The flanging punching Forming Die needs to be equipped with a pre-punching die. The die that turns the edge of the hole up after punching is the flanging punching Forming Die. It is mainly used to form threaded holes, and can also be used to install heat dissipation pipes, cable routing, plastic pipes, etc. After the flanging forming mold is formed, the edges are smooth and free of burrs, which will not cause scratches to the pipes. have an advantage. The flanging punching Forming Die is formed as shown in Figure 5.

 Flanging punching forming die forming
Figure 5 Flanging punching forming die forming

Knockout die

The knock-out hole mold is also called a spare prefabricated hole mold. It can be designed with single knock, double knock, and triple knock. There is a partial connection between the waste material and the main body of the workpiece. Depending on the thickness of the plate and the plate, the required connection ports are also different, mainly used for adapting to the electric board, etc. The knockout die is formed as shown in Figure 6.

 Knock-out die forming
Figure 6 Knock-out die forming

Extrusion die

The extrusion punching Forming Die is mainly a countersinking die, which is a stamping die for processing countersunk holes on the basis of pre-punching, which can replace drills to process holes. The extruded countersink die can process the workpiece in both positive and negative directions, and the extruded countersink can be used as a countersunk screw mounting hole. Using the extruding and countersinking die can omit the drilling and countersinking process, which can well ensure the processing quality and efficiency. The extrusion and countersinking die is formed as shown in Figure 7.

 Extrusion and countersinking die forming
Figure 7 Extrusion and countersinking die forming

Positioning the shearing die

Positioning shearing dies include sample punching dies, triangular positioning dies and semi-shearing dies. The sample punching die can be adjusted according to the height of the die to control the dot depth; the triangular positioning die is used on the thin plate that is difficult to process with the semi-cutting die. It should be noted that the minimum distance between the center of the positioning point is 15mm; the semi-cutting die can play the role of For the connection of the plates, the forming height should be less than 0.6 times the plate thickness. Positioning and shearing dies are less used, and will be customized only if there are special needs. The positioning shearing die is formed as shown in Figure 8.

Positioning and shearing die forming
Figure 8 Positioning and shearing die forming

If there are special requirements, the punching Forming Die can also be used as a composite die, such as a convex hull flanging composite die, which can complete pre-punching, flanging and convex hull forming at one time. However, when programming the composite mold, it is necessary to consider enough time for unloading, the forming direction can only be upward, and the price of the composite mold is much higher than that of the general forming mold.

Precautions for the use of forming molds

The following points should be paid attention to when using the forming mold:

(1) When using the punching Forming Die, you should always pay attention to the tightness of the locking screw of the servo turret punch. It is forbidden to punch without sheet material, and it is forbidden to punch the die to avoid damage to the punching Forming Die on the servo turret punch.

(2) Under normal circumstances, the forming direction of the punching Forming Die is selected upward, and the upward forming can avoid the deformation of the forming part of the workpiece and the lower die of the turntable caused by scraping.

(3) The lower die of the upward punching Forming Die is generally higher than the standard die, and the punching die on the side station should not be used as much as possible to avoid indentation of the workpiece. When the punching Forming Die is not in use, please remove it from the machine tool and coat it with anti-rust oil , stored in the mold box to avoid mold damage caused by rust and dust.

⑷ The stamping stroke of each servo turret punch is different. When the punching Forming Die is used for the first time, the upper die must be adjusted to the shortest to avoid damage to the die and punch failure. The punching Forming Die needs to be fine-tuned to achieve full forming.

⑸ For molds with large forming height or special forming, it is necessary to lubricate the plate well, strengthen the fluidity of the plate during forming, and reduce the probability of damage and tearing of the plate.

⑹ The forming position of the workpiece should be as far away as possible from the position of the clamp and the punching hole, and the forming step of the workpiece should be completed at the end of the processing process as much as possible.

⑺ A mold with a large forming height will have the hidden danger of scratches and collisions leading to deformation of the plate. Placing ball lower molds on both sides of the lower mold with a high forming height can avoid this problem. Continuing machining with other dies near a die with a larger forming height can result in deformation of the workpiece.

⑻ The punching Forming Die processing program needs to be used in the forming process. Sufficient unloading time should be reserved during programming, and the punching speed of the punch should be slowed down and impacted at a low speed, so that the formed workpiece has enough time to be separated from the punching Forming Die to avoid deformation of the workpiece. and deviation from the forming position.

As long as you use and save the mold according to the above precautions, the damage of the mold can be greatly reduced, and the ideal product can be obtained by using the forming mold well. The use of punching Forming Dies makes sheet metal processing more attractive.

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