Turret Punching Die: Classification, Selection and Installation

Classification of turret punch dies

Take Amada punch as an example:

AMADA CNC punch molds can be divided into two categories: original mold (metal return plate) (Fig. 1) and domestic mold (rubber return plate) (Fig. 2).

According to the mold shape, there are: round mold, waist round mold, rectangular mold, square mold, special-shaped mold, forming mold (sample punch, bump, counterbore, turn over hole, shutter, crimping die).

According to the size of the die, it is divided into the following corresponding stations:

Station X

Usually round mold( φ1.6~ φ12.7) and front sample die.

Corresponding to 10 stations of the machine tool;

original mold (metal return plate)

Fig. 1 original mold (metal return plate)

Fig. 2 domestic mold (rubber return plate)

Station B

Including round die( φ13~ φ27), square die (SQ4 ~ SQ16), partial rectangular die, partial waist round die, partial special-shaped die (keyhole, cross, trapezoid, hexagonal, single D die, etc.), forming die (reverse sample punch, bump, counterbore, hole turning die, etc.).

Corresponding to 16 stations of the machine tool;

Station C

Including round die( φ30~ φ37), square die (SQ20), partial rectangular die, partial waist round die, partial special-shaped die (double ear die).

Corresponding to 6 stations of machine tool;

Station D

Including round die( φ40~ φ50), square die (SQ35), partial rectangular die, partial waist round die.

Corresponding to 4 stations of machine tool;

Station E, F

It mainly includes cutter (RE60x4, RE60x5), square die (SQ50), special-shaped die (nine hole die).

Corresponding to 2 stations of machine tool;

Station G, H

Cutter (RE80x6), special-shaped die (shutter).

Corresponding to 2 stations of machine tool;

Station I

Indexing rotation station, is used to install the mold to be rotated.

It corresponds to 4 stations of the machine tool.

Selection of lower die

The general rule is to select the lower die clearance according to the material thickness of the workpiece to be processed, as shown in Table 1.

Table 1 Selection of lower die clearance

Material thickness (mm)0.5-
Clearance (mm)0.1-0.150.15-0.20.3-0.400.4-0.60.6-0.8

It should be noted that generally, the specified lower die corresponding to the upper die has only a gap of 0.1mm ~ 0.4mm.

When it is necessary to process plates more than 3mm, it shall be applied flexibly.

For example, when processing 4mm copper plate, the maximum clearance of the  φ6.5 lower mold is only 0.4mm, φ7.1 (0.15mm) lower die can be used instead at this time.

Installation of lower die

Open the turret cover → rotate the machine tool to the station where the lower die is to be installed → remove the lower die base with the specified tool → put the lower die into the corresponding empty station → check the height (the lower die height can be 1mm ~ 2mm higher than the die base. If the height of the die itself is not enough, add shims to adjust it to reach the standard height) → tighten the screws → install the lower die base to the turret → fix the lower die base on the turret with the specified tool → the lower die installation is completed.

The installation sequence of the lower die is shown in Figure 3.

installation sequence of lower die

Fig. 3 installation sequence of lower die

Installation of upper die

Install the mold according to the mold angle shown on the mold list. The specific operation steps are as follows:

The original mold sleeve or domestic mold sleeve shall be installed according to the selected upper mold. Generally, the fixed station, the domestic mold sleeve can only be installed at 0 ° or 90 °, and the original mold sleeve can be installed at 0 °, 45 ° and 90 °;

Put the upper mold into the selected mold sleeve (the corresponding pin is stuck in the corresponding groove), and the original mold sleeve can automatically slide into the bottom of the mold sleeve. Sometimes, the domestic mold sleeve needs a copper rod to gently tap the edge of the mold to slide into the bottom of the mold sleeve;

Cover the return plate and check the depth of the upper die. Generally, select the matching return plate to ensure that the height of the upper die is flush with or slightly lower than the return plate within 0.5mm.

The height of the die is absolutely not allowed to exceed the return plate.

If the height of the die itself cannot meet the specified requirements, it is necessary to increase or decrease the gasket in the die sleeve to make the die reach the above required height; After the height of the die reaches the standard, first tighten the screws behind the die sleeve, and then tighten the screws on the return plate.

Open the turret cover, rotate the turret to the corresponding upper die station after the installation of the lower die to ensure that the installation angle of the upper and lower die is consistent (very important), and then put the die vertically into the station to make it slide freely until the corresponding pin is completely stuck in the corresponding slot, and the red indicator light is on after the induction chuck of the turret is tightened, indicating that the installation of the upper die is completed.

Station selection optimization

Select the mold on the matching station, and give priority to the vacant station. If the station is not enough, consider the less commonly used mold station to ensure that the commonly used mold is always in the machine station, so as to facilitate less up and down molds in the later processing process.

Rotary station installation

The machine tool has four rotating stations.

The lower die of the rotating station is 0 ° by default, so the upper die can be installed and can only be installed at 0 ° (important).

The installation steps are as follows:

First install the lower die. After installing the lower die into the indexing converter, be sure to clean the dirt in the lower turret of the indexing station, and then clamp the lower die converter into the positioning groove, which is directly in front;

After that, install the upper mold.

After checking that the angles of the upper and lower molds are consistent, put the upper mold into the turret with the positioning groove at the upper right.

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