Lisheng’s summary of frequently asked questions from customers.
We warranty our materials and workmanship. Our commitment is to your satisfaction with our products. In warranty or not, it is the culture of our company to address and resolve all customer issues to everyone’s satisfaction
For samples, the lead time is about 7 days. For mass production, the lead time is 20-30 days after receiving the deposit payment. The lead times become effective when (1) we have received your deposit, and (2) we have your final approval for your products. If our lead times do not work with your deadline, please go over your requirements with your sale. In all cases we will try to accommodate your needs. In most cases we are able to do so.
Yes, we can provide most documentation including Certificates of Analysis / Conformance; Insurance; Origin, and other export documents where required.
Yes, we require all international orders to have an ongoing minimum order quantity. If you are looking to resell but in much smaller quantities, we recommend you check out our website
Yes, we always use high quality export packaging. We also use specialized hazard packing for dangerous goods and validated cold storage shippers for temperature sensitive items. Specialist packaging and non-standard packing requirements may incur an additional charge.
Yes, we have strong developing team. The products can be made according to your request.
Spring is a kind of mechanical parts using elasticity to work, for the general basic parts, has a wide range of use, many categories, low unit price, demand is large but the demand is scattered characteristics. Spring unit product value is not high, so from the output value and market size, the spring industry in the entire manufacturing industry belongs to a relatively small industry, but spring products as an indispensable part of the industrial manufacturing chain, the role played by can not be underestimated.
For a long time, the spring industry has formed an oversupply of low-grade ordinary springs, the passive situation of high-grade products in short supply.
According to expert statistics, China’s annual production volume of springs has reached 4 billion pieces, a total of 21 categories of various spring products, more than 1600 varieties, including wave springs for a high-precision flat wire compression springs, widely used in aerospace, precision machinery, hydraulic seals and high-end motors and many other industries and products, is one of the representatives of high-end springs.
Waveform spring is a more complex space curved parts, the shape is special, requiring uniform distribution of peaks and valleys according to the circumference, so the design, materials, processing equipment have strict requirements.
Design, advanced manufacturers of wave springs will use simulation and other design software for finite element analysis, etc., to provide specific theoretical guidance for wave spring stamping and forming process experiments; production and processing, most companies will independently develop and design special press tooling or equipment, combined with CNC spring presses, CNC ringing machines and other automated equipment to improve product efficiency and product quality; materials, according to In terms of materials, according to the needs of customers in different application areas, choose suitable and high-performance materials, such as the aerospace industry, the need to choose nickel-based alloys and other high-strength, high-temperature-resistant special alloys to process and produce, and materials to meet RoHS and other environmental requirements to achieve green manufacturing and intelligent manufacturing.
One of the major advantages of wave springs over ordinary cylindrical compression springs is that the working height required with the same load is reduced by more than 50%. In order to meet the requirements, higher strength materials need to be used.
Wave springs are used in aerospace, precision machinery, hydraulic seals, and high-end motors where internal space is limited, and dimensional accuracy is critical. The increase in the limit deviation of the inner and outer diameters facilitates the installation and stability of the performance of wave springs.
The spin ratio, or spring index, of a wave spring affects the strength, stiffness, stability, and ease of manufacture of the spring. In order to make the spring itself more stable and not flutter and be too soft, the winding ratio should not be too large; however, in order to avoid strong bending of the spring wire during winding, the winding ratio should not be small.
The number of turns of the wave spring impacts the load deviation when the spring is compressed to a specified height, and the larger the number of turns, the smaller the deviation.
The coefficient of elasticity reflects the relationship between the load and the deformation of the wave spring and is an important characteristic for measuring the performance of the spring product. Wave springs are installed at moving structures and are prone to friction with their surroundings. The increase in stiffness helps to extend their service life.
The shipping cost depends on the way you choose to get the goods. Express is normally the most quickest but also most expensive way. By seafreight is the best solution for big amounts. Exactly freight rates we can only give you if we know the details of amount, weight and way. Please contact us for further information.
You can make the payment to our bank account, Western Union or PayPal:
30% deposit in advance, 70% balance against the copy of B/L.
Our prices are subject to change depending on supply and other market factors. We will send you an updated price list after your company contact us for further information.
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Every day we receive inquiries from our customers about our company, our products, our payment methods, etc. We have summarized the common questions. If you don’t find the answer, please contact us.