How to choose a suitable special bottom die machine for knife die according to different bottom die materials?

This problem is very accurate, and choosing the right equipment is the basis to ensure the machining effect of the bottom die. According to the material of the bottom die, the core of selecting the bottom die machine is to match the hardness/density of the material with the cutting ability and spindle configuration of the equipment, and at the same time, to take into account the machining accuracy requirements.

First, select equipment according to material hardness classification

The physical characteristics of different materials are different, which directly determines the requirements for the power and tool compatibility of the bottom die machine, which can be divided into three categories.

1. Soft materials (such as EVA, sponge, cork board)

Core requirements: avoid material deformation and ensure smooth cutting edge.

Key points of equipment selection:

Spindle power: 1.5-3kW can meet the demand without being too high. Excessive power will lead to material collapse.

Tool adaptation: equipment with spiral milling cutter or straight edge cutter is preferred to reduce the phenomenon of material sticking to the cutter.

Auxiliary function: it is recommended to equip with a blowing device to blow away the processing waste in time to prevent the adhesion of waste from affecting the accuracy.

2. Medium-hard materials (such as PVC board, acrylic board and density board)

Core requirements: balance cutting efficiency and machining accuracy to avoid edge collapse.

Key points of equipment selection:

Spindle power: it needs to be moderate, mainly 3-5.5kW, to ensure stable cutting and no excessive vibration.

Spindle speed: Select adjustable speed equipment supporting 8000-18000rpm, with high speed for hard materials and low speed for soft materials.

Table configuration: vacuum adsorption table is preferred, which can firmly fix the plate, especially suitable for large-area PVC or acrylic processing.

3. Hard materials (such as aluminum plate, stainless steel plate and cemented carbide plate)

Core requirements: strong cutting ability, high stability, and avoiding excessive tool wear.

Key points of equipment selection:

Spindle power: the spindle must have high power, more than 6kW, to ensure that there is enough torque to cut hard materials.

Spindle type: choose water-cooled spindle, hard material processing produces high heat, and water cooling can effectively cool down, protecting spindle and cutter.

Fuselage structure: heavy cast iron fuselage is preferred, which is heavy and rigid, which can reduce the vibration during high-speed cutting and ensure the machining accuracy.

Second, additional key selection dimensions

In addition to the hardness of the material, it is necessary to pay attention to the following two points in combination with the actual processing scene to avoid the equipment being "usable but not easy to use".

Machining accuracy requirements

If it is necessary to process a high-precision bottom die (such as the bottom die of a knife die in the electronics industry, the accuracy is required to be ±0.05mm), it is necessary to choose equipment equipped with servo motors, which have higher positioning accuracy than stepping motors.

If it is the bottom die of the general packaging industry (the accuracy requirement is ±0.1mm), the stepping motor equipment can meet it, and the cost performance is higher.

Machining size requirement

Machining small-sized bottom die (such as the bottom die of mobile phone shell knife die): Choose small-sized workbench (such as 600×900mm) equipment, which occupies a small area and is flexible to move.

Processing large-size bottom dies (such as bottom dies of knife dies for cartons and packaging gift boxes): large-scale workbench (such as 1300×2500mm and above) should be selected to avoid splicing errors caused by multiple processing.