Full-Factory IE Lean Transformation Practice and Efficiency Upgrade Effect of Precision Punch Press Manufacturer T

Enterprise T is a medium-sized high-tech enterprise focusing on the R&D and batch manufacturing of medium and high-speed precision servo punch presses, mainly serving new energy structural parts, auto hardware and 3C precision stamping customers. The enterprise has a standardized assembly workshop, parts finishing workshop and finished product debugging workshop, with an annual production capacity of more than 800 sets of punch press equipment. Before launching IE lean zero-waste reform in Q3 2025, the enterprise adopted traditional experience-based workshop management mode. The production line layout was unreasonable, the operation standards of each station were not unified, the production beat was seriously unbalanced, and there were widespread problems such as waiting waste, repeated handling and overstocked in-process inventory. Although the enterprise had complete production equipment and sufficient manpower, the effective output was always lower than the industry average, the order delivery cycle was long, and the production rework cost remained high, restricting the enterprise’s rapid expansion of high-end customized orders.

From Q3 2025 to Q3 2026, Enterprise T launched a full-factory IE industrial engineering lean zero-waste systematic renovation project, covering workshop layout optimization, production line beat balancing, man-machine action decomposition optimization, full-station SOP standard sorting, logistics path rectification, in-process inventory lean control and zero-defect quality improvement. Through one year of closed-loop improvement, data monitoring and iterative optimization, the enterprise completely eliminated various invisible production wastes, realized comprehensive balance of production line stations, significant compression of manufacturing cycle and substantial improvement of per capita output, and successfully passed the lean production system certification of downstream head new energy enterprises, becoming a local benchmark of IE lean management in the punch press manufacturing industry.

2.1 Unreasonable workshop layout, serious logistics handling waste

The original workshop adopted functional partition layout, with parts processing, precision finishing, frame assembly, electrical assembly and finished product debugging areas scattered disorderly. Semi-finished parts needed to cross multiple areas for repeated handling in the production process. A single set of equipment had an average handling distance of more than 420 meters, resulting in a large amount of invalid working hour waste and easy collision and scratch of precision parts during handling.

2.2 Serious production line beat imbalance, prominent station bottleneck waste

The working hours of each assembly station were not matched. Individual key stations such as spindle assembly and servo debugging had long operation cycles, while auxiliary stations were idle for a long time. The overall production line balance rate was only 58.3%, resulting in frequent material accumulation at bottleneck stations and serious waiting waste of subsequent stations, which directly restricted the overall production efficiency.

2.3 Lack of standardized operation SOP, inconsistent operation quality and efficiency

All production operations relied on workers’ personal experience, without unified standardized operation procedures, time standards and quality inspection standards. The operation efficiency of new and old employees was quite different, and irregular operation behaviors such as random placement of tools and disorderly assembly sequence often occurred, leading to unstable product assembly quality and low overall production efficiency.

2.4 Excessive in-process inventory, occupying funds and hiding quality risks

In order to avoid production shutdown caused by parts shortage, the workshop blindly stocked a large number of semi-finished parts and auxiliary materials. The on-site in-process inventory ratio was as high as 18.5%. Excessive inventory not only occupied a large amount of working capital and workshop space, but also led to long-term stacking of parts, dust pollution and aging deformation, hiding potential quality risks.

2.5 Serious waiting waste and low man-machine utilization rate

The production schedule was arranged empirically without accurate beat calculation. Problems such as waiting for materials, waiting for inspection, waiting for equipment debugging and waiting for process confirmation frequently occurred on the production line. A large number of effective working hours were wasted, and the actual effective utilization rate of workshop manpower and equipment was less than 70%.

2.6 Scattered quality inspection points, high process defect rate and high rework cost

The traditional quality inspection adopted final inspection after assembly, lacking process node inspection and error prevention mechanisms. Assembly deviation, parts matching errors and wiring irregularities could only be found in the final debugging stage, resulting in high rework rate, serious material waste and prolonged production cycle.

Centering on the core goals of eliminating seven major production wastes, balancing production beats, standardizing on-site operations, reducing in-process inventory and improving full-line efficiency, Enterprise T adopted professional IE industrial engineering methods to carry out full-process diagnosis and systematic optimization, and implemented six core improvement measures:

3.1 Re-plan workshop streamline layout to eliminate logistics handling waste

Abandon the original functional partition mode, adopt streamlined production layout according to the equipment manufacturing process sequence, rearrange the positions of processing, finishing, assembly and debugging stations, realize one-way flow of materials from raw material entry to finished product delivery. Optimize the handling path and configure special material transfer tools, reduce the invalid handling distance of a single set of equipment by more than half, and completely eliminate cross-region repeated handling waste.

3.2 Carry out production line beat balancing optimization to break bottleneck stations

Use IE working hour measurement and action decomposition methods to record the operation time of each station in detail, accurately locate bottleneck processes such as precision assembly and servo debugging. Through operation content splitting, station merging, manpower allocation adjustment and tooling auxiliary optimization, balance the working beat of each station, eliminate idle waiting and process backlog, and greatly improve the overall production line balance rate.

3.3 Compile full-station standardized SOP operation manuals

Sort out the optimal operation experience of senior workers, decompose all assembly, debugging and inspection actions into standardized steps, formulate unified SOP operation guidelines, working hour standards and quality acceptance standards for each station. Equip each station with process display boards and operation videos to realize standardized operation for all employees, eliminate efficiency differences caused by personal operation habits, and stabilize product assembly quality.

3.4 Implement in-process inventory lean control and zero-stock buffer management

Establish a scientific material scheduling mechanism based on production order beats, cancel blind overstocking of on-site materials, implement regular fixed-point material supply and on-demand distribution. Set upper limit early warning of in-process inventory, clean up long-term stacked semi-finished products regularly, reduce on-site inventory occupation, activate idle assets, and avoid quality risks caused by long-term stacking of parts.

3.5 Optimize man-machine matching and eliminate full-link waiting waste

Adopt IE man-machine collaboration analysis method, reasonably allocate manual operation and equipment automatic processing links, formulate accurate daily production scheduling plans. Realize precise docking of materials, personnel, equipment and process inspection nodes, eliminate waiting for materials, waiting for inspection and waiting for debugging, and maximize the effective utilization rate of manpower and equipment.

3.6 Build process zero-defect quality inspection system to reduce rework waste

Change the traditional post-final inspection mode, set up special quality inspection nodes in key process links such as parts matching, frame assembly, electrical wiring and servo debugging. Add error prevention and inspection mechanisms in the production process, find and repair defective problems in the initial stage, avoid large-area rework in the final stage, and reduce process material waste and working hour loss.

After one year of systematic lean renovation and stable operation, all core production efficiency, cost and quality indicators of Enterprise T have achieved comprehensive and substantial optimization, with strong replicability for medium and large punch press manufacturing enterprises with multi-station assembly production characteristics:

From the perspective of comprehensive operating benefits, the IE lean zero-waste transformation has brought substantial internal efficiency dividends and cost reduction benefits to Enterprise T. The enterprise has realized capacity expansion without increasing factory buildings, equipment and manpower. The annual comprehensive production cost was reduced by 8.7%, the effective annual output increased by nearly 30%, and the on-time delivery rate of customized orders was fully improved. The standardized lean production system not only solves the long-standing problems of unbalanced production and unstable quality, but also helps the enterprise successfully pass the strict supplier lean system audit of many new energy head enterprises, laying a solid foundation for the enterprise to further expand high-end high-margin order markets.

This IE industrial engineering lean zero-waste optimization case is completely different from digital intelligence transformation, spare parts operation, mold management and customized solution reform cases. It focuses on on-site production process refinement, invisible waste elimination and stock capacity tapping, providing a low-investment, high-return and highly replicable efficiency upgrading path for punch press enterprises trapped in fixed capacity and high production costs:

1. The production efficiency ceiling of most punch press enterprises does not come from insufficient hardware capacity, but from a large number of invisible process wastes and unbalanced production beats. IE lean management can effectively tap the inherent potential of existing production resources.

2. Standardized SOP operation and streamlined workshop layout are the basic guarantees for stable product quality and efficient production. Empirical workshop management will inevitably lead to efficiency loss and quality fluctuation, while systematic lean management forms standardized production barriers.

3. In-process inventory is the largest hidden waste in manufacturing workshops. Lean inventory control can activate idle assets, reduce capital occupation and avoid potential quality risks brought by overstocked parts.

4. Production line balance optimization is the core key to improve overall factory efficiency. Only by realizing full-station beat synchronization can we completely eliminate waiting waste and maximize effective production output.

In the next stage, Enterprise T will further integrate IE lean management system with MES production execution system, realize digital real-time monitoring of production beats, automatic early warning of station bottlenecks and intelligent scheduling of on-site materials. The enterprise will build a full-cycle lean closed-loop management mechanism of “data monitoring - problem diagnosis - iterative optimization - effect verification", and gradually promote fine lean management to every production link and post.

For the whole punch press manufacturing industry, IE industrial engineering zero-waste lean transformation will become a necessary management upgrade in the stock competition era. More enterprises will abandon extensive empirical management modes, realize cost reduction and efficiency improvement through internal potential tapping, and promote the industry to shift from scale expansion growth to refined management high-quality growth.