Machinery Enterprise Procurement: Which CNC Processing Manufacturer To Choose?

Machinery Enterprise Procurement: Which CNC Processing Manufacturer to Choose?

Equipment strength is the last word

To be considered a reliable CNC processing manufacturer, it must be equipped with equipment such as CNC lathes, as well as precision machines such as machining centers, milling machines, and grinders. The quantity, brand and maintenance status of these equipment directly determine the processing capacity and stability. For example, there are many head manufacturers in Jiangsu and Zhejiang regions that spend millions of yuan every year to update five-axis linkage machining centers to ensure that they can handle the efficient cutting of complex parts.

If the manufacturer's equipment is obsolete, even the most basic CNC system is still the same as ten years ago. Not only is the accuracy difficult to guarantee, but the production efficiency will also drop significantly. During the inspection, the purchasing personnel must step into the workshop in person and look at the year of manufacture and operating status on the equipment nameplate. Do not just look at the photos in the brochure.

Processing accuracy is the core indicator

The processing of precision mechanical parts generally requires an accuracy level of 0.002mm, which requires manufacturers to equip high-precision testing instruments such as three-dimensional dimensions, projectors, height meters, hardness testers, etc. Take an auto parts customer in Shenzhen as an example. Because the manufacturer did not have three-dimensional equipment, the outer diameter of a batch of shaft parts was out of tolerance by 0.01mm. As a result, the entire batch of products worth 300,000 yuan was scrapped.

I suggested that when selecting manufacturers, the purchasing personnel must carefully examine the testing capabilities of those manufacturers, see whether the quality inspection team holds professional certificates, and whether the testing process covers incoming materials, first article, process inspection, and full shipment inspection. There are some small workshops that do not even have a decent micrometer, so cooperation in this way will be too risky.

The professionalism of the technical team is crucial

The rational planning of the machining process is proficient in the experienced technical team. It can be reasonably formulated based on product characteristics, and various technical problems can be properly solved. Just like a part with an aluminum alloy shell, which is processed by ordinary manufacturers through conventional paths. Vibration marks and dimensional out-of-tolerance conditions frequently occur. The professional team adjusts and changes the cutting parameters and fixture plans, and the yield rate rises from 65% to 98%, showing a significant increase.

Excellent manufacturers will be equipped with specialized process engineers. These engineers will work with customers to optimize the structural design to reduce the difficulty and cost of processing. In 2023, there was a company in Suzhou. It had unreasonable design drawings, which caused parts to frequently deform during processing. Fortunately, engineers from the manufacturers they cooperated with took the initiative to provide modification plans, which prevented subsequent batch scrapping.

The quality management system must be improved

Manufacturers that implement quality management systems such as ISO9001 or IATF16949 are reliable manufacturers. According to this system, strict quality control processes are in place from raw material procurement to finished product delivery. For example, there is a precision processing plant in Ningbo that performs CPK analysis on each batch of products every day. The data is archived for more than 3 years, and customers can trace the processing records of each product at any time.

I further suggested that the personnel responsible for purchasing check the quality certification qualifications of the manufacturers and then learn about their specific handling procedures for non-conforming products. There are some manufacturers that do not even have the most basic incoming material inspection link. They use whatever the supplier sends over. Cooperation in this way is undoubtedly equivalent to handing over product quality to other parties!

Communication and service capabilities cannot be ignored

Manufacturers with good standards will have professional contacts corresponding to the project, and their ability to respond to customer needs in a timely manner, provide technical support and progress feedback. For example, there is an enterprise customer in Dongguan who frequently sends drawings after get off work for the manufacturer to confirm the process. The customer service of the other party can reply with a feasibility assessment within 30 minutes. This response speed greatly reduces the waiting time of both parties.

If there is only one salesperson in the manufacturer who holds multiple responsibilities, he must not only receive orders, but also follow up on the progress of orders, and also take on after-sales responsibilities. In the event of an emergency, it will be difficult to take care of everything. Purchasing personnel can rely on preliminary trial quotations and sample communication to observe the manufacturer's response speed and professionalism, which is often an indicator of whether the cooperation is smooth.

Cost control must be reasonable

The lower the price, the better. However, it does not mean that the higher the better. For example, in the Yangtze River Delta region in 2024, the processing cost of a five-axis machining center per hour is about 120 yuan. If a manufacturer quotes only 60 yuan, then there is a high probability that it is cutting corners or using second-hand equipment. On the contrary, although the unit price of some high-end manufacturers is 20% higher, they have helped customers reduce material waste and subsequent assembly costs through optimized processes, and the actual total cost is actually lower.

Procurement personnel are advised to comprehensively consider the manufacturer's equipment, technology, quality and service, and then select a cost-effective partner. They can ask the manufacturer to give detailed quotation details, distinguish the price differences of parts of different sizes and materials, and then make decisions based on the trial processing results. Some manufacturers have very low prices, but the quality and delivery time cannot be guaranteed. Such bargains cannot really be taken advantage of.

What kind of traps have you encountered when choosing a CNC processing factory? Welcome to share your past experiences in the comment area, like this article and save it, and check it out before choosing a factory next time, so as to avoid unnecessary mistakes.