What matters should be paid attention to when the precision engraving machine processes the die of packaging products?

Matters needing attention in the whole process of precision engraving machine (packaging wood mold/plywood knife mold)

Application: Cartons, color boxes, gift boxes, self-adhesive packaging knife dies (18mm/23.8mm plywood, slotting of high-density knife templates), which are divided into seven major items: drawing, pre-boarding, plate loading, parameter processing, midway inspection, completion and equipment maintenance.

A, drawings and tool path pretreatment (source control accuracy)

Line type distinction: solid line = cutter groove, dotted line = indentation groove, dotted line = half-piercing tear, layered color separation output, and it is forbidden to confuse cutter/line pressing with layer.

Structural process limitation

The minimum internal r of the sharp angle is more than or equal to R≥R1mm, so as to avoid the edge collapse of the groove position and the clamping of the cutter; Small bridge crossing position ≥3mm to prevent plate from breaking.

The spacing between the cutter groove and the indentation groove is more than or equal to 2 times the thickness of the paper, so as to prevent line explosion and indentation deformation during die cutting.

Gift box/thick gray board separately accounts for the indentation groove depth, and the flute depth of corrugated and paper jam is programmed separately.

Tool path verification: before getting on the machine, take the simulated XY trajectory, check the overall dimensions, and reserve the tolerance of ±0.05mm；; Replace the small-diameter cutter at the narrow slot and recalculate the cutter path to avoid over-cutting.

Second, the equipment inspection before starting the machine

Spindle system: check the cooling oil/water cooling circulation of the spindle and the smooth lubricating oil path; Idle for 3min minutes, no abnormal sound, jumping, fever, bearing no gap shaking.

Workbench and adsorption: dust and sawdust are cleaned on the vacuum table, and the sealing strip is intact; When the vacuum pump pressure reaches the standard, the thin plate material must be vacuum absorbed, and the thick plate pressure plate is pressed to reinforce it.

Limit and origin: Return to the mechanical origin and check that the X/Y/Z three-axis limit and anti-collision switch are effective; Reset the zero point of Z-axis tool alignment for each plate change and tool change.

Three, plate clamping specification (anti-displacement, uneven depth)

Knife template (multi-layer plywood/high-density board) has flat front and back, and the warped board is flattened in advance, and the thickness of the board is even, with an error of < ＜0.15mm.

Four principles of plate loading: flat, solid, tight and empty.

The board face is completely attached to the table top, and there is no hanging at the four corners. The hanging position is padded with the same thickness pad;

The surrounding layering is pressed tightly, and after the vacuum is turned on, it is confirmed that there is no empty drum in the plate;

The edge of the plate is far away from the travel limit of the main shaft to prevent collision;

The thickness of multiple plates in the same batch is uniform, and the thickness difference exceeds 0.2mm and is processed in batches.

It is forbidden to fix small scattered plates at a single point, and high-speed milling is easy to run away and waste knives and plates.

Four, tool selection and knife loading points

Tool selection (standard for packaging die)

Cutting groove: double-edged milling cutter/slotted tungsten steel cutter; Φ3/Φ4 small diameter cutter is used for narrow slot, and Φ 6 for conventional slot;

Indentation slot: special U-shaped and V-shaped forming knives, and the cutter head is selected according to the width of indentation steel wire.

Knife loading standard

The chuck cleans the sawdust impurities, and the shorter the exposed length of the tool clamping, the better, reducing the tremor; Lock it evenly, and it is forbidden to knock the chuck to install the knife.

Replace the tool immediately if it is cracked, missing edge and radial runout exceeds the standard. Bad tools will cause burrs and different depths on the groove wall.

Z-axis trial cutting and tool alignment: try milling at the scrap corner, measure the groove depth, fine-tune the Z origin, and control the groove depth tolerance by ±0.03mm (groove depth = steel cutter height-pad allowance).

Five, cutting parameters and machining control (core anti-gouging, plate collapse)

1. Speed feed reference (plywood die)

Spindle speed: 18,000 ~ 24,000 r/min; Slotting feed: 300 ~ 600 mm/min, automatic speed reduction of corner to prevent corner collapse;

The deep groove shall be cut by layers, with a single cut of ≤3mm, and the multi-layer plate shall be prevented from being split by layers once.

2. Processing taboo

It is forbidden to stop at high speed and modify the feed/speed parameters at will; Small and dense cutter paths reduce feed and reduce chatter.

The groove wall should be smooth and burr-free, and the burr is large → slow down and change the sharp tool; Inconsistent depth of groove bottom → plate hollowing or Z origin deviation.

Processing to avoid plate seam, seam is easy to depth difference, drawing typesetting to avoid in advance.

3. Ambient temperature and humidity

Plywood expands and shrinks when it is wet, and the temperature and humidity in the workshop are stable. Wet boards are dried before carving to avoid slotting deformation.

Six, the main points of inspection in the middle of processing

Stop and spot check every 1/3 of the processed layout: slot width, slot depth and hole size, and compare the drawings;

Observe dust collection and dust removal: sawdust is sucked away in time, and the accumulated chips squeeze the tool, which causes the groove to deform and burn the tool;

Press the emergency stop immediately in case of abnormal sound, spindle boring and plate shaking, and check for tool clamping, loose plate and tool wear. It is forbidden to continue processing in spite of illness.

Seven, the completion of blanking and quality inspection

After the spindle is stopped, loosen the layering and dismantle the plate. It is forbidden to manually move the plate without stopping the cutter.

Tool die self-inspection:

The groove width is suitable for the tightness of the steel knife (the steel knife is not loose or tight, without shaking or jamming);

Indentation slot depth is uniform, try to plug the indentation steel wire, and the height is consistent;

Overall dimension, socket and locking tolerance ≤±0.1mm；;

Minor repair and polishing of burr groove, marking and repairing of damaged groove.

VIII. Daily Equipment Maintenance & Safety Specification

Safety: Wear goggles during operation, and it is forbidden to reach out to the table and clean up debris during operation (brush stops to clean up); Long hair is coiled up, and loose clothes are forbidden to approach the spindle.

Daily maintenance: clean up the sawdust on the table and guide rail every day; Fill the guide rail with lubricating oil every week, and clean up the blockage of vacuum pump filter element and dust removal pipeline.

Long-term shutdown: loosen the chuck, remove the tool for rust prevention, and turn off the air source and water source.