Application of 3+2 CNC Machining in Mold Making Factory
Plastic injection mold manufacturers have long embraced simultaneous multiple-axis machining on machine tools with five or more axes, but more and more China injection mold makers have begun machining mold components on multiaxis platforms in the past few years, said Charlie Chan, engineering manager HS Mold & Die Co.,LTD
He mentioned, however, that the common approach for machining mold parts in houses is 3+2, or 5-axis positional machining. According to his estimate, about 80% to875% of the multi-axis work is performed via 3+2 rather than simultaneous when cutting up to five sides of a prismatic metal workpiece in one fixturing.
What is 3+2 CNC Machining
3+2 (5 axis) CNC machining, also called “positional five-axis machining”, is a technique whereby a three-axis milling program is executed with the cutting tool locked in a tilted position using the 5-axis machine’s two rotational axes, hence the name, 3+2 machining. During the machining process, the fourth and fifth axes are used to rotate the cutting tool in a fixed position rather than to manipulate the tool continuously. On a standard three-axis machine, the only part face that the CNC machine could cut with a cutting tool in its normal position is the horizontal face that faces directly at the spindle.
3+2 CNC Machining Advantages
Compared to conventional three-axis machining, the main advantage of 3+2 CNC machining is the reduction of setup time. According to data from our mold making shop, we could save easily 20% to 25% in setup time because we don’t have to handle that part multiple times.”
Another big benefit of 3+2 CNC Machining is that it allows for the use of a shorter, more rigid cutting tool. With 3+2 machining, the spindle head can be lowered closer to the work piece with the tool angled toward the part surface. This means that a good surface finish and more accurate dimensional results can be achieved .This helps to improve part accuracy by being able to position a work piece so that short, rigid cutting tools are applied, such as when producing undercuts in mold cavities and steep wall inserts in addition, with 3+2 machining, we can use standard, off-the-shelf tools
Rather than using some custom, extra-long tool or holder and risk vibration, this helps to save money easily by 10% to 15% in injection mold costs because there is no need to use special tools for mold manufacturers in china, 3+2 Machining is an ideal option because they can use more off-the-shelf, standard catalog tooling. They have the freedom to reach into my part at different angles without using an especially long tool or special to make that feature on that part.
Application of 3+2 CNC Machining
Where applicable, 3+2 machining will save time and improve operations.This technique is more and more popular with mold making company because it offers great convenience while deep cavities or inserts in complex plastic molds that would otherwise have to be machined with long, slender tools or with tool extensions. Long, slender tools increase the risk of deflection or chatter and tool extensions can create clearance problems. Using 3+2 machining also allows undercuts in cavities and steep walls on standing mold cores to be machined directly. This technique might reduce or eliminate operations for electrical discharge machining (EDM).Relatively few parts are not suitable for 3+2 machining, including complex components. 3+2 CNC Machining is usually used to machine below parts:
deep cavities or inserts in complex plastic molds
certain types of parts from the solid rather than from a complex casting
Drilling holes of metal parts at compound angles such as aluminum brake cylinders in a single setup
We are a China injection mold maker and our CNC machining center has both 3+2 and full 5 axis machining capability, capable of making prototypes and production parts as fast as one day. Reach out HS Mold and see how we could benefit your next CNC rapid prototyping or low-volume manufacturing project.
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For something a little different than my usual virtual photography, here's my project for the Horizon Creation Celebration hosted by @horizon-events!
I'm really happy with how it turned out - and I'm excited to see everyone else's creations! More info below the cut ↓
I had this leather bag that I found at a thrift store, but it had somebody else's monogram on the front that I never liked. I always planned to do something about it - and I thought adding the medallion from Rost's armor would be the perfect project. The stitching of the medallion required the most work by far, but I also added a little Nora-inspired feather-and-bluegleam charm to the strap.
I didn't buy any supplies for this - everything was sourced from things I'd already collected (...hoarded?) in hopes of using them in a project someday.* The medallion uses reclaimed leather from an old purse, some blue cord I'd saved from... somewhere, and red cord of similar provenance. A stiff piece of plastic from packaging serves as interior support, and a strong magnet is currently holding it to the bag. I may attach it permanently, but I didn't want to yet in case I decided to use the medallion somewhere else!
All the feathers were found on the ground - there's an obvious jay feather (Steller's jay's in my neck of the woods), a white feather (most likely from a gull) that I colored with alcohol ink, and what I believe is a pelican feather - you can barely see it behind the purple one. The cords holding the feathers were all from my stash as well.
The "bluegleam" is a quartz point colored with glass paint. I'd had an idea for sculpting and casting the bluegleam cluster Aloy wears on her Frozen Wilds armors, but I wasn't able to get a finished product I was happy with. I'm not giving up on it, though - hopefully I can manage it someday!
*Which, honestly, is a miracle. I finally used stuff in a project! See, keeping interesting things is more than just adding to clutter!
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