0 1 ? What is a laminating die?
Laminated mold is the frontier technology of plastic mold development. The cavities are distributed on two or more layers and arranged in an overlapping manner. Simply put, the laminated mold is equivalent to stacking several single-layer molds together and installing them on an injection molding machine for injection molding production.
The demand background of laminated mold usually, when a single-layer plastic injection mold is used on an injection molding machine, its injection volume and mold opening stroke are only 20%~40%, which does not give full play to the performance of the injection molding machine. Under the conditions of 1 injection molding machine and 1 operator, the output of laminated injection mold can be doubled according to the number of layers, which can greatly improve the production efficiency and equipment utilization. Laminated injection mold is most suitable for molding large flat parts, shallow cavity shell parts, small multi-cavity thin-walled parts and parts that need mass production.
02 ? What are the advantages of laminating die?
1) Compared with conventional dies, the clamping force of laminated dies is only increased by 10% ~ 15%, but the output can be increased by 90% ~ 95%.
2) The mold manufacturing requirements are basically the same as those of conventional molds, and multiple pairs of cavities are combined in one mold, so the mold manufacturing cycle is greatly shortened;
3) Using high-efficiency laminated injection mold, the output of ordinary single-layer mold can be twice or four times without additional machinery and equipment. This saves the cost of installing machinery and equipment, expanding factories and increasing new labor;
4) Laminated molds can be installed on injection molding machines with similar requirements for single-layer molds, but the output efficiency per unit time is doubled.
5) saving raw materials, easy automation, improving product performance and shortening production cycle.
03 ? Classification of laminating dies
1) common laminated die
2-layer mold?
Three-layer mold
Four-layer mold
Gundam 10 layer.
2) Rotating laminating die?
Each double-layer double-sided rotation 180 degrees?
Double-deck and four-sided 90-degree rotation to achieve lean hegemony.
3 layers, 2 faces (each time 180 degree rotation) +4 faces (each time 90 degree rotation)
3) Series module
04 ? Development course of laminated die
1) The original model of the laminated die adopts American Alanson cD. 1899, the gray color of thin-walled wax products;
2) As early as1940,65438+February, E.R.Knowles obtained the patent right of laminating die, but it was not popularized;
3) In 1960s, Swiss mold manufacturers began to study laminated molds for processing plastics, mainly injection molds for producing packaging boxes and simple daily necessities;
4) 1980, the Germans designed a double-layer injection mold with common runner (that is, a laminated mold with cold runner);
5) In the late 1980s and early 1990s, Japanese and Germans designed and invented hot runner laminated dies with different structures; Lean hegemony
Rozema of Tradesco Mould Company developed a four-layer mould in the early 1990s.
7) From 265438 to the beginning of the 20th century, Tradesco Mould Company successfully developed a three-layer multi-cavity laminated hot runner mould;
8)65438-0995, Grabovski, Russia developed a right-angle hot runner laminated die;
9) In 265438+at the beginning of the 20th century, the Germans designed a dual-material rotating laminated mold with 16+ 16 cavity, and then the rotating laminated mold for multi-color injection molding was gradually widely used;
10) In 2002, the Institute of Applied Science of Bielefeld University in Germany developed a series die for thick-walled products.
05 ? Laminated die structure
2 basic components of laminated die
Design of overlapping hot runner
1) main nozzle movement direction
2) Connection between main nozzle and runner plate
3) Connection of runner plate and hot nozzle
4) Integrated design of wireframe, junction box and hot runner.
5) Hot runner balancing technology
6) convenience consideration of hot runner assembly and disassembly
7) Protection of hot runner system
Hot nozzle protection
Synchronous mold opening mechanism
Intermediate support sliding guide mechanism
ejection mechanism
Guiding and positioning system-mold blank
06 ? Problems to be considered in the design of laminated die
1) After mold opening, the main nozzle can't get out of the guide sleeve. Pay attention to the reasonable setting of the length of the main nozzle and the mold opening stroke; Lean hegemony
2) The maximum mold opening stroke and the maximum plasticizing amount of injection molding machine need to be checked;
3) The preforming efficiency of the injection device should be high;
4) The injection amount should be increased appropriately;
5) pressure release of the hot runner melt;
6) Deal with the relationship between the cavity layout and the main nozzle.