Page 11 - 《橡塑技术与装备》英文版2025年12月

SPECIAL AND COMPREHENSIVE REVIEW

Analysis of the "boring instead of grinding"

manufacturing optimization project for the barrel of

large extrusion granulation units

Yu Ying, Yue Guangli

(Dalian Rubber & Plastics Machinery Co. LTD., Dalian 116036, Liaoning, China)

Abstract: With the rapid development of the manufacturing industry, the requirements for processing
efficiency and quality are increasing day by day. Although the traditional grinding method for the barrel of
large extrusion granulation units achieves high precision, the straightness and parallelism of the double holes
often exceed the tolerance range, and the processing cycle is long and the cost is high. To overcome these
challenges, our company has explored a new processing method in practice-using self-made tools for boring
instead of grinding. The "boring instead of grinding" manufacturing optimization project has significantly
improved the surface quality and dimensional accuracy of the barrel, reduced the rate of product non-
conformity caused by processing errors, ensured the stability and consistency of the extrusion granulation
process, and thus improved the overall quality of the product. This project has filled the gap in our company's
processing technology and achieved good results and benefits.
Key words: CNC inserts; boring instead of grinding; machine barrel; optimization
Classification number: TQ330.44 Article number: 1009-797X (2025) 12-0005-07
Document code: B DOI: 10.13520/j.cnki.rpte.2025.12.002

The ethylene industry is a pillar industry in China's period of major petrochemical projects, achieved "self-control
national economy. The scale and equipment capacity of of key core technologies", and maintained national economic
ethylene are important indicators to measure the level of and energy security.
national petrochemical industry. The mixing and extrusion The barrel of a large extrusion granulation unit is a key
granulation unit is a core equipment mainly used in the core component of the equipment. The double holes of the
ethylene process. Internationally, only three companies, barrel are composed of two identical circular holes intersecting
namely Germany, Japan, and China, have mastered the core (commonly known as "8-shaped holes"). The straightness
technology of this type of unit. China has long relied on requirement for the machining of the double holes is 0.03
imports (with a total of more than 260 sets introduced, costing mm, and the perpendicularity requirement to the end face is
tens of billions of yuan), and technology has been blocked, also 0.03 mm. As one set of the unit consists of 8 to 11 barrels
the market monopolized, and prices manipulated. This has assembled in series (see Figure 1), the quality of straightness
severely restricted the healthy and rapid development of will affect the operational performance of the unit. To ensure
China's petrochemical industry, endangering national energy the straightness requirement, the machining of the double
and economic security. The successful development of the holes of the barrel is of utmost importance in the entire barrel
extrusion granulation unit has filled the domestic gap, broken
the technological blockade and monopoly imposed on China Biography: Yu Ying (1985-), senior engineer primarily responsible for
by foreign countries, solved the "bottleneck" problem of large- CNC programming in mechanical processing. She has published multiple
scale petrochemical equipment, shortened the construction papers in related fields.

Vol.51，2025 ·5·