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Application of Forming Die in Servo Turret Punch

Servo turret punch is a kind of equipment widely used in sheet metal processing.

With the rapid development of mechanical manufacturing industry, laser cutting machine has replaced most of the market share of servo turret punch.

Even so, servo turret punch still has the function that laser cutting machine cannot have.

For some sheet metal products that need to be formed, the laser cutting machine is not fully competent, such as rib rolling, step rolling, shutter, flanging, convex hull and other processes still need the forming die processing of servo turret punch.

Therefore, for sheet metal processing, servo turret punch and forming die are still an indispensable part.

The charm of sheet metal lies in forming. Forming dies are widely used in sheet metal processing fields with forming needs, such as elevators, air conditioners, anti-theft doors, chassis, anti-skid plates, etc., with the advantages of flexibility, high efficiency and low cost.

Compared with the common punching die, the structure of the forming die is complex and the manufacturing process is complex.

The initial trial punching of the forming die needs to continuously debug the die in combination with the forming condition of the workpiece until the workpiece meets the requirements is punched out.

Therefore, the manufacturing cycle of the forming die is long, and the customer needs to be informed in advance when customizing the die to avoid unnecessary contradictions during the delivery of the machine tool.

Type of forming die

The forming dies on the servo turret punch mainly include roller die, embossing and depicting die, shallow drawing die, punching die, flanging die, knock off hole die, extrusion die, positioning shear die, etc.

Roller die

The roller die includes rib rolling die and step rolling die.

It needs to be placed on the rotating station to meet the processing requirements of arbitrary curve shape, and there is no step stamping mark on the plate.

Through the matching rollers installed 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 parts form a relative movement in the stamping process, so as to realize the forming processing of the long convex rib, and the length of the convex rib is not limited by the die.

For rib rolling die and step rolling die, different forming heights and widths need to be determined according to the requirements of customers.

This kind of die has a wide range of stamping ribs, accurate positioning and high processing 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;
  • The forming height is 2 ~ 3 times of the plate thickness;
  • The width is 2 times of the height, and the maximum width is 12.7mm.

The roller die and forming are shown in Fig. 1.

Roller die and forming

Fig. 1 Roller die and forming

Stamping and engraving die

Embossing and engraving molds include code molds, embossing molds, concave convex word molds and engraving molds.

Stamping with embossing die and concave convex die can form embossing on sheet metal, which can be raised upward or downward.

The use of embossing die can help customers omit the reprocessing processes of parts such as labeling and painting, saving money and increasing efficiency.

The engraving die is a die for engraving or dot matrix marking on the surface of the workpiece, which will not change the shape of the sheet metal parts, nor cause indentation and affect the beauty.

It can adapt to the processing of plates of different materials by adjusting the spring.

The forming direction is downward and needs to be placed in the rotating station. The stamping and engraving die and forming are shown in Fig. 2.

Stamping and depicting die and forming

Fig. 2 Stamping and depicting die and forming

Shallow drawing die

The shallow drawing die is mainly a convex hull forming die, which is composed of a punch and a female die located below.

The forming height and angle of convex hull forming die shall not be too large to avoid fracture at the joint.

The convex hull 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 according to the trial punching results of the holes.

The convex hull forming die is widely used.

The water drop die is similar to the convex hull.

The array water drop shaped convex hull has beautiful style and can process the maximum plate thickness of 1.5mm;

The bamboo weaving die needs to cooperate with the punching die, and the maximum plate thickness of stamping medium carbon steel plate is still 1.5mm.

The forming of shallow drawing die is shown in Fig. 3.

Punching forming die

Fig. 3 Shallow drawing die forming

Punching forming die

The punching forming die includes shutter die, tongue cutting die, bridge die and clamping die.

The punching forming die is mainly used for ventilation, pipe clamp, decoration, etc.

The shutter die is most widely used.

The shutter die is generally selected where the chassis and other workpieces need heat dissipation, which is beautiful and practical;

Tongue cutting die is mainly used for the combined part between sheet metal parts, which is similar to buckle;

The bridge mold is used for inserting wire pipe, which is simple and convenient;

The clamping die is used for the installation port of electrical components.

The punching forming die is mainly divided into punching and forming.

Its structure is complex and can meet most of the customer’s requirements for products.

The forming of punching forming die is shown in Fig. 4.

Punching forming die

Fig. 4 Punching forming die

Flanging forming die

The flanging forming die needs to be matched with the pre punching die.

The die that turns up the edge of the hole after punching is the flanging forming die.

It is mainly used to form threaded holes, and can also be used to install heat dissipation pipes, cable routing, threading plastic pipes, etc.

After the flanging forming die is formed, the edge is smooth without burrs, which will not scratch the pipe.

It has more advantages for direct punching and threading.

The forming of flanging forming die is shown in Fig. 5.

Flanging forming die

Fig. 5 Flanging forming die

Knock down hole die

Knock down hole mould is also called standby prefabricated hole mould, which can be designed as single knock, double knock and three knock.

There is a partial connection between the waste and the main body of the workpiece.

According to the plate thickness and plate, the required connection port is also different.

It is mainly used for distribution boards, etc.

The forming of knock down hole die is shown in Fig. 6.

Forming of knock down hole die

Fig. 6 Forming of knock down hole die

Extrusion die

Extrusion forming die is mainly the die for extruding counterbores.

It is a stamping die for processing counterbores on the basis of pre punching, which can replace the drill to process holes.

The extruding counterbore die can process the workpiece in both positive and negative ways.

The extruded counterbore can be used as the installation hole of countersunk screw.

The use of squeeze sinking hole die can omit the drilling sinking process of drill bit, and can well ensure the processing quality and efficiency.

The forming of the die for extruding and sinking holes is shown in Fig. 7.

Forming of extrusion sinking hole die

Fig. 7 Forming of extrusion sinking hole die

Positioning shear die

Positioning and shearing die includes sample punching die, triangular positioning die and semi shearing die.

The sample punching die can control the dot depth according to the height of the die;

The triangular positioning die is used on the thin plate which is difficult to be processed by the semi shear die.

It should be noted that the minimum center distance of the positioning point is 15mm;

The semi shear die can connect the material and the plate, and the forming height should be less than 0.6 times the plate thickness.

The positioning and shearing die is less used and can be customized only when there are special needs.

The forming of positioning shear die is shown in Fig. 8.

Positioning and shearing die forming

Fig. 8 Positioning and shearing die forming

If there are special needs, the forming die can also be used as a composite die, such as convex flanging composite die, which can complete pre punching, flanging and convex hull forming at one time.

However, when programming the composite die, sufficient unloading time should be considered, the forming direction can only be upward, and the price of the composite die is too much higher than that of the general forming die.

Precautions for use of forming die

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

(1) When using the forming die, always pay attention to the tightness of the locking screw of the servo turret punch.

It is forbidden to punch without sheet metal and empty punch the die, so as to avoid damage to the forming die on the servo turret punch.

(2) Generally, the forming direction of the forming die is upward.

Upward forming can avoid the deformation caused by scraping between the forming part of the workpiece and the lower die of the rotary table.

(3) The lower die of the upward forming die is generally higher than the standard lower die.

The punching die on the next station should not be used as far as possible to avoid indentation of the workpiece.

When the forming die is not used, please take it out of the machine tool, coat it with antirust oil and store it in the die box to avoid damage to the die caused by rust and dust.

(4) The stamping stroke of each servo turret punch is different.

When the forming die is used for the first time, the upper die must be adjusted to the shortest to avoid die damage and punch failure.

The forming die needs to be fine tuned to achieve full forming.

(5) For molds with high forming height or special forming, it is necessary to lubricate the plate, strengthen the fluidity of the plate during forming, and reduce the probability of plate damage and tear.

(6) The forming position of the workpiece shall be far away from the clamp and punching position as far as possible, and the forming step of the workpiece shall be completed at the end of the processing process as far as possible.

(7) The die with high forming height will scratch and collide the plate and cause deformation.

This problem can be avoided by placing ball lower die on both sides of the lower die of the die with high forming height.

Using other molds near the mold with high forming height to continue processing will lead to workpiece deformation.

(8) The forming die processing program shall be used during forming processing.

Sufficient unloading time shall be reserved during programming, and the stamping speed of the punch shall be slowed down and impacted at low speed, so that the formed workpiece has enough time to be separated from the forming die to avoid workpiece deformation and deviation from the forming position.

As long as we refer to the above precautions to use and save the die, we can greatly reduce the damage of the die and use the forming die well to get the ideal product.

The use of forming die makes the processing of sheet metal more attractive.

Conclusion

When selecting the forming die, we must express the requirements in place.

At the same time, when ordering the servo turret punch, we should also consider whether the stamping stroke of the punch can meet the forming height of the workpiece.

With the advantages of high efficiency and energy saving in sheet metal forming, servo turret punch still occupies a place in the mechanical field.

It is believed that the development and application of forming die in servo turret punch will be more and more widely in the future. 

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