Machining and Fabrication News from the Greater Houston Area

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A Machine Fabrication Announces Thread Rolling Capabilities Feb 28, 2017


Striving to remain a leader in LDPE High Pressure component manufacturing, A&A now has the ability to provide rolled threads for your LDPE equipment, as an in-house service.

Thread rolling is a cold forming process that can be performed on ductile metal, a process that has been around for more than one hundred years. Thread rollers come in a variety of types and sizes, but they all use a mechanism where hardened steel dies, or rolls, are matched and set to penetrate, with force, in order to reshape the material surface of a round diameter into a thread form. Formed threads are preferred for high strength and critical applications like those found in the petro-chemical industry. Threads that are rolled, especially on heat treated parts, have higher tension, shear, and fatigue strength. No material is removed during the rolling process, eliminating one of the inherent weaknesses of cut or ground threads. No tool marks or stress risers occur during thread rolling. The cold formed properties include a higher density of material grains, or molecules, especially where they have been compacted along the lower flank of each thread pitch and in the root of the thread.

Studs, bolts, compressor piston rods and certainly LDPE HP tubing, which represents one of A&A's niche capabilities, are a few examples of parts which our customers prefer their threads rolled. Our tooling list for this technology at present allows for the rolling of various size threads between 7/8" to 5". Watch the video below and see this new capability in action.





New Autofrettage System - Nov 17, 2016



In keeping with A & A's policy of always improving technology, we have acquired a new, state-of-the-art autofrettage system for better serving our customers needs. In 1975, A&A began autofrettage service with a pneumatic-driven autofrettage pump system that was rated at maximum pressure of 175 ksi. In 1999, we added a second unit that utilized hydraulic drive rated at 200 ksi. In July of this year, we replaced our original unit system with a hydraulic autofrettage system that is rated at 17ksi. This unit incorporates the latest technology including digital data input, computer-generated data forms, and real-time pressure charts.


High Pressure Tube Supplier - Oct 30, 2015


A & A Machine Fabrication, LLC announced today that they have signed an agreement with TimkenSteel (Canton, Ohio) to market, sell and produce high pressure tubing (HPT) for use in the manufacture of low density polyethylene. For many years, the supply of this special thick-wall tubing could only be found in Europe, where lead times were long and the product was expensive for North American buyers. Now, the buyers and users of the HPT can find a high quality U.S. supply with significantly shorter lead times. A&A has also just received approval from its first client for the supply of HPT from TimkenSteel.
C. Alan Hutchins, President & CEO, states, "This agreement will position us and TimkenSteel for the future growth in North America and other parts of the world for HPT supply. Users of the tubing will be able to plan projects with a more accurate forecast due to the shorter lead times, ease of inspection and oversight of the manufacturing process.

Kraig Warren, A&A Fabrication & Engineering Manager, guided, led and drove the project to completion. Starting in January 2013, the project required numerous conferences and voluminous data collection through manufacturing and testing of the tubing. Kraig Warren commented, "It was a long, hard road, but the results are exciting for the industry and its future growth. We learned valuable information about the tube making process and HPT chemical and mechanical characteristics.



Modular Skid Shipment - May 1, 2015


A & A recently completed eight modular process skids that play an integral part in the manufacturing of polyethylene. Two of the skids will be shipped to China and the other six are for domestic production. These modular process skids represent the uniquely combined precision machining and fabrication skills of our company.


SynGas Association Conference - April 20-22, 2015


As we continue to grow our customer base and Always Available brand, A&A attended the SynGas Association 2015 conference in Tulsa, Oklahoma, April 20-22. Various producers and suppliers of the Synthetic Gas Industry were in attendance. Keynote speakers discussed various details of the SynGas processes and several technical seminars were made available to attendees.

Kraig Warren, A&A’s Fabrication & Engineering Manager, recently attended the 2017 ASME PVP Conference held from July 16-20, 2017 in Waikoloa, Hawaii. At the conference, Mr. Warren presented ASME paper PVP2017-65223 titled High Pressure Tubing Material Performance Review that discussed the qualification process and results for HS220-27-Ca4 High Pressure Tubing material that is manufactured by TimkenSteel. The qualification included fatigue testing to ASME Section VIII Division 3 Article KD-3, which consisted of cycle testing samples up to 1,000,000 times over pressures ranging from 40-65 ksi. A Leak-Before-Burst test was also performed on a specimen that was intentionally ran to failure in order to ensure that the result was a pin-hole leak rather than a catastrophic burst. In addition, A&A processed the material to autofrettage requirements set forth in ASME Section VIII Division 3 Article KD-5. A&A was able to prove that the HS220-27-Ca4 material was able to meet ASME requirements and industry specifications for use in the manufacture of Low Density Polyethylene (LDPE) plastics.

A&A and TimkenSteel have gained market acceptance of this product as multiple end-users have purchased the HS-220-Ca4 material from A&A for use in their LDPE processes. A&A and TimkenSteel continue to jointly market this product to users as a reliable, cost-effective and short lead-time item.



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A&A Machine & Fabrication Announces Thread Rolling Capabilities


Striving to remain a leader in LDPE High Pressure component manufacturing, A & A Machine & Fabrication LLC now has the ability to provide rolled threads for your LDPE equipment, as an in-house service.

Thread rolling is a cold forming process that can be performed on ductile metal, a process that has been around for more than one hundred years. Thread rollers come in a variety of types and sizes, but they all use a mechanism where hardened steel dies, or rolls, are matched and set to penetrate, with force, in order to reshape the material surface of a round diameter into a thread form. Formed threads are preferred for high strength and critical applications like those found in the petro-chemical industry. Threads that are rolled, especially on heat treated parts, have higher tension, shear, and fatigue strength. No material is removed during the rolling process, eliminating one of the inherent weaknesses of cut or ground threads. No tool marks or stress risers occur during thread rolling. The cold formed properties include a higher density of material grains, or molecules, especially where they have been compacted along the lower flank of each thread pitch and in the root of the thread.

Studs, bolts, compressor piston rods and certainly LDPE HP tubing, which represents one of A&A's niche capabilities, are a few examples of parts which our customers prefer their threads rolled. Our tooling list for this technology at present allows for the rolling of various size threads between 7/8" to 5". Watch the video below and see this new capability in action.