Product category:
CNC punching and profiling
News Release from: Mate Precision Tooling | Subject: Mate Sheetmarker tool system
Edited by the Manufacturingtalk Editorial
Team on 22 May 2006
Punch press tool scores PVC coated SS
Domestic products manufacturer uses a sheet marking tool in a punch press to score protective PVC covering on SS sheets prior to silk screening in 24/7 fabricating of barbecue components.
Unattended 24/7 machine operation is very important to high volume, progressive companies like BMP Metals With seven turret presses, three of which are operated continuously unattended whenever possible, finding a way to eliminate a slow and tedious hand operation for scoring protective PVC plastics covering on sheet metal parts was imperative
This article was originally published on Manufacturingtalk on 18 Jul 2008 at 8.00am (UK)
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BMP Metals is a fully integrated custom precision sheet metal fabricator with additional specialized services in CNC machining and turning, supplying complete product assemblies to the telecommunication, transportation, medical, military and consumer industries.
Its products include everything from seismic rated cable management systems for aerospace applications to high-end barbecues for the consumer market.
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The hand operation required stopping the Finn Power LPE laser punch system so an operator could score protective PVC plastic covering on stainless steel panels.
The scoring operation was needed to create holes and openings through which silk screening printing onto the bare metal surface was performed while adjacent areas retained the protective PVC material.
"We manufacture high end barbecues with 20 gauge stainless steel fabricated panels," reported Robert-Daniel Bedard, facilities manager for the company.
"These parts are punched and laser cut from 48in x 96in sheets prior to silk screening printing.
To protect these panels during punching and laser cutting operations, we keep the protective PVC covering on the stainless steel sheets.
Since the laser does not penetrate the PVC material well, the machine operator has to cut a slightly oversized hole using a special knife with a soft copper blade in the PVC material and then remove it from the panel.
The part moves on for silkscreen printing of the exposed metal surface adjacent to the PVC protected metal.
While this process worked, it was slow and did not take advantage of the high volume automated capabilities of the Finn Power LPE Laser Punch system.
We had to find a better way." Protecting the stainless steel surfaces is critical for BMP Metals because any unwanted score marks to the surface makes the part unacceptable and therefore expensive scrap.
Cutting through the plastic PVC covering with the laser was not an option.
Depending on the type and thickness of the PVC material, contact with the laser beam causes it to bubble up and separate unevenly from the sheet metal.
The bubbles get in the way of subsequent fabricating operations and the laser causes the PVC material to melt and stick to the metal components and created undesirable fumes.
* Mate Sheetmarker tool automates PVC scoring operation - as a long-time user of Mate tooling for its seven CNC presses, Bedard checked with Mate's sales engineer, Peter Visser, to see if he had any ideas for speeding up the scoring process employing the punching function of the laser/punch system.
Visser suggested trying Mate's Sheetmarker tool, together with replacement inserts.
Originally designed to permanently mark sheet metal parts with assembly codes, serial numbers, names and etchings, the Sheetmarker tool easily converts to cut protective film on metal sheets without marking the metal surface.
It does this by creating a tool path generated by the punch press programming system.
The press holds the ram down while the sheet is moved in the X- and Y-axis, creating the desired tool path and scoring pattern.
A brass insert in the Sheetmarker tool is machined to a point that is sharp enough to cut the plastic film but will not damage the sheet metal beneath it.
With exceptional versatility, the Sheetmarker can score PVC material anywhere on the sheet without marking the backside or deforming the material.
Scoring is smooth and consistent.
The scoring depth is variable, which allows for precise control around complex or intricate shapes.
And the Sheetmarker tool is not limited by a particular plastic PVC material type or thickness.
Also, the Sheetmarker tool is designed with a backing spring so variations in sheet and PVC material flatness or warpage are automatically adjusted for by the tool to retain even and consistent scoring.
(Photo Five) For both scoring and marking operations, the tool assembly consists of an insert holder, insert retainer, three springs and a Sheetmarker roller die.
For PVC scoring operations, a softer, brass tip is inserted into the tool assembly instead of the usual hard diamond tip used for marking operations.
Setup for either operation is fast and easy because no additional machine hardware such as letter or embossing inserts are required.
Just the simple tip change is needed.
* 1000 stainless steel sheets processed per day using Mate Sheetmarker tool - "We are running lights out 24/7 using the Mate Sheetmarker to score the PVC on our stainless steel sheets and outputting a thousand a day and seven thousand per week," reported Bedard.
"The scoring operation has repeatable accuracy, where before variations occurred from sheet to sheet and operator to operator.
Adding that Sheetmarker tool allowed us to automate a really critical operation and insure part quality to the entire barbecue panel processing operation.
It is a great way to add value to parts and protect fine surface finishes while streamlining fabricating operations.
We are also planning to use the Sheetmarker, with interchangeable diamond tipped inserts, to produce serial numbers on telecommunication components and other parts." In addition to Finn Power presses, Sheetmarker tools are available for Amada, Murata Wiedemann, Nisshinbo, Strippit/LVD, Euromac and other punch presses using thick turret tooling. Request a free brochure from Mate Precision Tooling ...
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