https://ronenmachine.en.made-in-china.com/product/PCExpWRHunUK/China-High-Productivity-M11-M12-M13-M14-Aluminum-Hex-Coupling-Nut-Hex-Bolt-and-Nut-19b-6s-Nut-Making-Machine.html
Productivity in the nuts and bolts industry, 1958-90
Manufacturing techniques, technologies
The manufacture of bolts and screws involves a series of steps that can be performed either by a
number of specialized machinrs or by a single piece of machinery called a boltm,&cr.‘5 A metal
wire or rod is first cut into blanks abut the size of the finished bolt or screw. Thesc TLT&. are then
fed into die presses that form the hea.~~ “of :L:.E, bolt or screw. Next, the modified blanks ZE i!tirr.~med to the correct length, pointed, and threaded. Finally, the products are heat treated and then gal”~- nized or plated.
During the late 1970’s and throughout the 1980’s, new generations of boltforming machinery were gradually adopted by the industry. In contrast to older machines, these models operate at
much higher speeds, typically producing two to three times the number of bolts per hour as their
predecessors. I6
They also pro duce more precise products, which reduces the need for metalcutting operations to achieve specified tolerances. Less maintenance is also required on these machines, because they use high-strength carbon-steel pans.”
Productivity gains registered by the industry since the late 1970’s, however, did not stem entirely
from the introduction of new machinery.‘* In 1989, the average age of production machinery
used in the industry was still about 25 yearsI Changes in production processes, retrofitting
older machinery, and the introduction of statistical process-control techniques also contributed
to gains in output per employee hour. In some cases, significant reductions in unit labor requirements were achieved by changing the manufacturing process from one in which products were passed from one fabrication stage to the next in batches to a process in which a single operator was responsible for all the functions needed to produce a particular product (called inline processing).20
In other cases, older production machinery was retrofitted with computerass&d %wices to reduce material-handling cperssicn~ and improve machine-operating speee,. ’ * ” 81,. addition, the introduction of statistical process-control techniques has increased machinery utilization rates and product quality
in many instances, while reducing the need for quality control inspectors.22
Other factors contributing to productivity gains, particularly during the 1980’s, were the
increasing use of computer-aided design and engineering technologies,23 better control of inventories and orders,i4 changes in work rules,25 and the automation of certain office functions, such
as payroll and accounts payable and receivable. Indicative of the increased use of computers in
the industry in a variety of areas, such as offtce function:, ratanufacturing processes, and inventory
control, anliisdl investments in computers more than quadrupied between 1977 and 1987. In current-dollar terms, the industry spent $1600,000 for computer eqrGs:inent in 1977, or 1.7 percent of
total capital equ’pment expenditures that year. In 1987, computer expenditures totaled $7,200,000,
or 5.8 percent of capital expenditures.
5S LEAN MANUFACTURING
Rolled Threads management has a strong commitment to continuously improving company processes and procedures to ensure the satisfaction of our customers. Lean management allows us, taking the customer’s point of view, to identify what is of value and then analyze all of our processes and eliminate anything that doesn’t add value. The active elimination of non value-added waste allows us to accelerate the flow of both materials and administrative information, providing our customer with their product cheaper, faster, and with higher quality than our competitors. This approach also allows us the flexibility to better respond to customers’ changing needs.
As the core of our lean journey, Rolled Threads uses the “5S” system. Sorting, Straightening, Shining, Scheduling, and Sustaining has allowed us to improve quality and productivity while propelling us toward our goal of becoming model suppliers for our customers. This system also allows our greatest resource, our employees, to get actively involved in finding creative ways to improve our business and their workspace through Kaizen events and daily implantation of 5S.
http://www.rolledthreads.com/aboutus/news/5s-lean-manufacturing
Diamond Fasteners offers vendor managed inventory
http://www.diamondfasteners.com/blog/bid/326571/How-to-Save-Money-on-Aircraft-Nuts-and-Bolts
History of the bolt
http://www.nord-lock.com/bolted/the-history-of-the-bolt/
Manufacturers
https://www.anixter.com/north-america/us/en/expertise/fastener-manufacturing.html
Lakshmi Precision Screws Ltd.
http://www.lpsindia.com/lps.pdf
Ud 27 May 2021
pub 20 Feb 2014
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