Quality Assurance of Threads with Automation
(PresseBox) - It was many decades ago that machine tool operators first inspected the quality into a threaded component using thread/ring go and no-go gauge (gage if you are a real old timer). checking has long since evolved and taken on a whole new look driven initially by the increased demand requirements of the military, automotive industry, world class machine builders and our customers to employ a zero-defect philosophy backed by ISO/QS, 6-Sigma, LEAN and corrective/preventive procesent.
?Do I need to simply validate thread presence, overall functionality at some level or do I need/want conformance to traceable standards with real data as support??
Here is a brief overview of the most common practices for automating thread evaluation available, categorized as non-contact and contact gauging, that can best solve your specific thread validation challenges.
Non-Contact Thread Checking Technologies ? relative speed and throughput but at a cost/risk?
Proximity Sensors, Photo eyes, Fiber optics, Lasers ? Cost effective Detect vs Measure
These technologies are all options employed to determine the presence of a thread. l be lowest cost of entry for OD/ID thread checks from low to medium albeit with lowest assurances of thread validation.
Eddy current ? open up and say ahh
Eddy current testing works by inserting a probe into a threaded hole. & temperatures, etc., thought and care must be given to eddy current probes as they can easily be damaged/broken and can be expensive to replace. If the probe finds an undersized hole or collides with a broken tap fragment, the internals can easily be damaged.
Vision Systems ? lights, camera, action
Vision solutions use sophisticated cameras to determine simple thread presence and can measure some attributes on OD threads (pitch, length). ability to validate internal threads is also limited typically to thread presence with these systems as well.
Contact Thread Checking Technologies ? Automating the Functional Test
Rotary Contact Gauging ? Get in, Get out, Good enough
Rotary contact gauging involves mechanically deploying a gauging member using air/stepper/servo motors, simple slip clutches, limit switches/proximity sensors (depth) and compliant tool holders (designed to prevent damage should an obstruction or other resistance be encountered). The appeal of rotary contact gaging is that it is a truly functional verification process. This method works well with either internal or external threads, and when the thread gauge members are selected properly, successful assembly of the gauged part (with its mating part) can be assured. , the need to incorporate this gauge member into your calibration system/preventive maintenance system is also paramount as these tend to be a wearing/perishable item.
SMAC Thread Checking Approach -When 100% Thread Verification is Required
SMAC?s thread checking systems function off the foundation of what has always worked well; the go thread gauge member (traceable back to National Standards) and advances it by enabling real time feedback of important thread attribute data. Using their 2-axis voice coil linear motor and low inertia custom wound servo motors (with encoder feedback) SMAC thread checking systems can:
Soft-land (patented) on threads to prevent damage and assure easy gauge start
Reverse to align & find first thread, (assure its position if important)
Validate total turns, thread depth, running torque or an undersized pitch/depth condition
Check for an on oversized pitch thread condition on the first 3 threads (traditional no-go gauge position), last 3 threads (linear clearance of the go gauge can be correlated directly to a measured pitch diameter dimension)
Validate OD/ID threads, both through and blind
Validate the presence of a spot-face or counterbore if present on part
Send real thread data back to PLC (EIP/EtherCAT), PLC (Labview, 3rd party QA software, or serial)
Use a master part to validate go gauge calibration/integrity as part of your quality assurance plan
All this functionality will cost you 2-5 seconds to conduct a complete thread check depending on size (although these units can be stacked/arranged to check multiple threads in one cycle), a moderate price tag for all this capability (still more cost effective than most vision systems) and current limitations to
SMAC is a leading manufacturer of precision programmable electric actuators based on moving coil technology. Our actuators are unique in that force, position, and speed are totally programmable. SMAC electric actuators are designed to perform at exceptionally high speeds or very low speeds and with sub-micron accuracy and repeatability. Patented Soft-Land? function gives extremely accurate sensing of product location or dimensions.
This makes SMAC electric actuators ideal for a wide range of high cycle positioning, measuring, inspection, and pick and place applications, particularly where 100% verification is required. Customers desiring to increase up-time, ease of set up, and adjustment can make dramatic improvements by using mechatronic SMAC Moving Coil technology.
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SMAC is a leading manufacturer of precision programmable electric actuators based on moving coil technology. Our actuators are unique in that force, position, and speed are totally programmable. SMAC electric actuators are designed to perform at exceptionally high speeds or very low speeds and with sub-micron accuracy and repeatability. Patented Soft-Land? function gives extremely accurate sensing of product location or dimensions.This makes SMAC electric actuators ideal for a wide range of high cycle positioning, measuring, inspection, and pick and place applications, particularly where 100% verification is required. Customers desiring to increase up-time, ease of set up, and adjustment can make dramatic improvements by using mechatronic SMAC Moving Coil technology.
Datum: 09.07.2019 - 17:26 Uhr
Sprache: Deutsch
News-ID 1550583
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