News - SUZHOU LIZHU MACHINERY CO., LTD

This exclusive international collaboration case outlines how Suzhou Lizhu Machinery’s custom-engineered vertical injection presses, single-slide vertical insert molding systems, and in-house developed constant-pressure hydraulic control units resolved critical precision issues and throughput constraints for an established automotive hardware manufacturer based in Penang, Malaysia. As a specialized vertical molding equipment provider with capabilities spanning in-house R&D, smart manufacturing, overseas after-sales support, and tailored non-standard customizations, Suzhou Lizhu Machinery has supplied comprehensive vertical molding solutions to numerous factories in the automotive, consumer electronics, and metal-insert overmolding sectors across Southeast Asia, South Asia, and the Middle East.

The client partner is a well-established local OEM producer situated in Penang, Malaysia, focused on high-volume manufacturing of automotive rubber-metal composite structural components, embedded plastic clips, wiring harness positioning retainers, and small stamped inserts for new energy vehicles. Fueled by the rapid growth of regional NEV supporting supply chains, the company secured continuous large-scale, long-term OEM contracts. However, its existing outdated horizontal presses and conventional small general-purpose molding machines were unable to meet the stringent precision standards required for automotive component production.

During routine high-volume production, the factory encountered several persistent quality and efficiency obstacles. To begin with, the existing molding systems lacked high-accuracy positioning mechanisms for metallic inserts; stamped components frequently shifted during mold closure, resulting in defects such as short shots, burrs along the parting line, and inconsistent encapsulation layers. Overall rejection rates for finished automotive parts once hit 16%, leading to substantial material waste and repeated delays in shipment schedules. In addition, the outdated hydraulic actuation units on the older machines suffered from slow response times and prolonged per-cycle molding durations, making it difficult for daily output to keep pace with large-volume order commitments. Furthermore, the structural rigidity of the original machine frames proved inadequate; under extended high-intensity operation, unplanned downtime for repairs occurred frequently, driving up overall maintenance labor costs and hindering the company's ability to scale up its market presence.

After conducting side-by-side evaluations of dozens of international injection equipment suppliers through major B2B portals, overseas trade exhibitions, and referrals from industry peers, the client eventually decided to enter into a formal partnership with Suzhou Lizhu Machinery. Subsequently, they placed volume orders for multiple sets of customized vertical injection presses and upgraded single-slide vertical insert molding machines, aiming to fully overhaul and modernize their workshop production lines.

In response to both the demanding precision criteria for automotive hybrid-material components and the space constraints of the client's existing facility layout, Suzhou Lizhu Machinery's senior technical engineering team developed a purpose-built, end-to-end molding strategy. The tailor-made high-accuracy vertical injection unit features the company's proprietary integrated high-stiffness cast frame and vertical direct-pressure clamping system, which deliver uniform clamping force and micron-level insert positioning accuracy—thereby eradicating the root cause of displacement defects in metal inserts. This system is further enhanced by Suzhou Lizhu's in-house developed digital closed-loop intelligent control platform, which enables real-time, fine-tuned adjustments to shot volume, holding pressure, and injection velocity, effectively minimizing flash and short-shot defects commonly seen in precision plastic molded parts.

Matched with the dedicated single-slide vertical insert molding press purpose-designed for automotive hardware parts, the user-friendly open-access work station streamlines manual placement and securing of stamped metal components, significantly improving loading efficiency. Every vertical press unit delivered by Suzhou Lizhu Machinery is equipped with an energy-conserving constant-pressure hydraulic molding package, featuring consistent mechanical performance and exceptionally low breakdown frequency under continuous high-duty-cycle operation, ideally suited to the high-volume standardized manufacturing model of automotive supply-chain producers.

Following international container shipping, transborder freight arrangements, in-plant machine setup, tooling trial runs, and structured workforce training sessions, the client commenced full-capacity series production using Suzhou Lizhu Machinery's vertical press line. After two months of uninterrupted steady throughput, all key operational metrics achieved significant gains. The defect rate for automotive rubber-to-metal bonded components fell dramatically from 16% to below 2.8%. Unit cycle time was reduced by nearly 22%, and overall shop-floor daily throughput increased by over 25%. The power-efficient hydraulic design of Suzhou Lizhu Machinery's vertical presses noticeably lowered per-part energy usage, while robust mechanical reliability greatly diminished machine stoppage rates and routine upkeep labor costs.

The client's head of production engineering gave high praise for the build quality and integrated overseas service framework of Suzhou Lizhu Machinery. He commented that the single-slide vertical insert molding press and high-accuracy vertical injection units run reliably, deliver excellent part accuracy, and offer broad process flexibility—thoroughly resolving the persistent quality and productivity issues that had long challenged the plant, and greatly enhancing the enterprise's order fulfillment capability and overall competitive standing.

To date, the client's new production line has sustained dependable performance over multiple months. They have also entered into a multiyear strategic procurement arrangement with Suzhou Lizhu Machinery, planning to acquire further vertical press systems in the upcoming budget year to scale up manufacturing capacity for precision components used in new-energy vehicles.

Suzhou Lizhu Machinery consistently focuses on real-world production challenges faced by manufacturers worldwide, continuously advancing core vertical injection press technologies. The company provides nonstandard machine tailoring, pre-sale tooling concept validation, full-lifecycle offshore technical support, and permanent remote plus field-based after-sale service as bundled offerings. If your insert-overmolding operations are challenged by placement precision issues, inadequate throughput, or elevated scrap rates, you are welcome to reach out to Suzhou Lizhu Machinery to obtain tailored high-performance precision molding solutions.