Empowering Excellence: Strategies for Optimizing Mold Shop Systems and On-Site Management

A successful mold manufacturing company that produces high-quality mold products and generates substantial profits must have its unique characteristics. Analyzing the reasons for this success, such companies typically possess the following traits: a well-established system, an efficient team, exceptional execution capabilities, and a spirit of innovation. Setting aside the strategic operations and development directions of these companies, we will focus on the system construction and on-site management of the mold shop.

Mold Shop Systems

1. Organizational Structure and Work Guidelines

For mold manufacturing departments, different companies have different approaches. In some, machinists handle all aspects of mold follow-up, while others involve Technical Engineers (TE) and production planners to manage all mold-related tasks. Here, we discuss a management breakdown based on the first model, which offers advantages of quick response and high efficiency.

  1. Design Department – ESI Review and Mold Design

    The design department is primarily responsible for the early ESI (Early Supplier Involvement) review, mold design, and communication with clients regarding product review. They can also provide technical support for quotations. For single-product molds with short lead times, standard components such as pressure blocks, wear plates, stop pillars, support heads, and angled guide pillars can be used. In some cases, even the front and rear molds, along with core components, can be designed as standard parts, significantly speeding up the production cycle of new molds.

Mold Shop Systems
  • Processing Department – Programming, CNC, EDM, EDW, and Grinding

    This department is responsible for production scheduling and processing coordination. The workflow can be organized to allow overlapping processes, ensuring a smooth production line. When a process becomes a bottleneck, it can quickly move to the next stage. This approach greatly reduces back-and-forth coordination among teams, shortens communication time, and enables molds to be ready for production on time while ensuring mold quality and delivery timelines.

  • Assembly Department – Mold Assembly, TE for Mold Modification, and Polishing

    Machinists handle mold assembly, execute mold modification plans, and carry out mold maintenance. A lead machinist is assigned responsibility for each mold, tracking every detail such as materials, processing, and standard parts progress. They are accountable for the final delivery time and the quality standards of the mold. The Technical Engineer (TE) mainly follows up on the mold’s progress, leads modification planning, and addresses technical issues related to mold structure review during the design phase.

  • Planning and Process Group (PMC)

    This group is responsible for creating production plans and tracking production progress. They also establish part processing times, calculate mold costs, handle exceptions, and organize the processing sequence for each part.

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2. Detailed System Construction and On-Site Management from Processing Onward

  1. CAM Programming Team

    CAM programming plays a crucial role in mold production. If the programming is unreasonable or the technical skills of the programmer are insufficient, it can result in CNC machining times being doubled or even longer. Through secondary development of UG (Unigraphics), programmers uniformly use UG machining templates, establish a UG tool library, and standardize parameters. This minimizes the need for manual input, reduces complexity and errors in parameter adjustment, and enhances programming efficiency, CNC machining precision, and overall efficiency, potentially saving at least a quarter of manpower while increasing machine utilization.

    The technical proficiency of programming directly affects the quality, precision, and work efficiency of CNC, EDM, wire cutting, grinding, and assembly.

    • (1) Establish standardized UG mold machining templates and external plugins for all programmers. This improves programming efficiency and reduces errors, including standardizing cutting speeds and feed rates. Define appropriate machining parameters for mold cores, inserts, mold bases, electrodes, etc., and strictly control NC speed through programming, preventing CNC operators from altering programs and improving efficiency.

    • (2) Write programs according to single operations and single tool numbers to facilitate easy repairs in the CNC workshop without the need for additional programming.

    • (3) Create a comprehensive programming manual that provides guidance on machining steel, graphite, copper electrodes, and other materials.

    • (4) Conduct secondary development on LINK files to reduce manual operations and increase efficiency.

    • (5) Develop paperless operations through secondary development of program sheets. Once mature, the CNC workshop can simply open PDF files and set up tools.

    • (6) Implement automatic electrode discharge, in collaboration with EDM. Through secondary development, automated discharge processes can be established. The operator only needs to install the electrode, center the workpiece, and open the CNC file generated by the program, which automatically completes discharge operations, including XYZ data and discharge parameters such as current pulse width.

    • (7) Enable automatic workpiece inspection, in collaboration with QC, through secondary development of automated inspections. The operator installs the electrode on the CMM, centers the workpiece, and opens the CNC file to automatically measure relevant inspection points.

    • (8) Collect and summarize common programming errors to create a guide, “Common Issues in CNC Mold Programming,” for programmers to study and prevent such errors.

    • (9) Programmers must follow “CNC Programmer Work Standards,” “CNC Mold Programming Parameter Standards,” and “Common Issues in CNC Mold Programming.” They are responsible for tracking the progress of their assigned NC programs.

    • (10) After completing a mold set, programmers must list program and electrode summaries, distributing them to NC, EDM, wire cutting, and mold assembly teams, ensuring that everyone has clear and timely information on program or electrode progress. Each department can then schedule their tasks according to the overall mold production schedule.

    • (11) Programmers participate in design reviews early in the design phase. After design completion, they hold machining review meetings, release electrode and material lists, write electrode programs, generate discharge diagrams, and write steel material programs. Progress information is then updated on the progress tracking chart.

 

2. CNC Machining Team

The CNC team is a vital department in mold manufacturing, as the quality and efficiency of machining directly impact the success or failure of molds. This team requires an effective combination of hardware resources, machine operators, production technology processes, and departmental standards to ensure that production quality and efficiency fully meet production requirements.

The use of automatic tool changers for clamping tools during machining is essential. When selecting machines, it is advisable to choose closed-tool storage systems. Open tool storage can easily accumulate metal shavings and debris, which may cause tool holders to become jammed during tool changes, significantly reducing machining precision. Excessive clamping deviation can even lead to workpiece scrapping.

The transmission method involves a local area network (LAN) connection, where one computer controls multiple CNC machines. This setup facilitates management and saves on computer hardware costs.

CNC electrodes should utilize a quick-clamping EROW or 3R system, synchronized with the EDM machine. All electrodes can be processed directly by calling up programming routines without the need for manual data collection. The operator’s tasks include clamping the workpiece and executing the programmed instructions. The machining feed rate is controlled by the programming. To standardize and unify the machining speed and prevent operators from arbitrarily controlling the feed rate, operators are instructed to set the machine’s feed knob to 100%. The machine will then automatically change tools and perform machining. Once completed, the operator simply checks the workpiece for quality, cleans up, and removes it from the machine.

In the medium term, there are plans to implement external pre-setting stations to calibrate and center workpieces before machining, thus saving clamping time. Long-term plans include the use of automated production line systems.

  • (1) Hardware machines and software programs will be implemented programmatically and automated.

  • (2) Operators will engage in foolproof operations, simply following the program to set up tools without needing to modify parameters such as speed or feed rates, thus preventing human errors.

  • (3) Collaboration with programming will facilitate paperless operations, reducing costs and improving efficiency.

  • (4) Strict implementation of the three inspections (first inspection, mutual inspection, self-inspection) and the three no’s (do not overlook without clarifying the cause, do not overlook without implementing preventive measures, do not allow non-conforming products to escape).

  • (5) Regular checks of tool wear precision after machining to ensure the quality and precision of the finished workpieces meet the standards for FIT molds completed in one go, with no chipping occurrences.

  • (6) Tools in the tool storage will be checked daily, with unqualified tools replaced promptly.

5-axis CNC
 

3. EDM Machining Team

EDM (Electrical Discharge Machining) holds a crucial position in the mold industry, known for its extensive processing range, low cutting force, and ease of forming. It utilizes electrical energy for gap discharges, enabling the machining of small holes, hard alloys, mirror finishes, and virtually any shape, as well as special surface treatments.

Graphite electrodes are preferred for spark erosion machining. Although the cost of graphite is about 1.5 to 2 times that of copper, its discharge speed is 30% faster than that of copper, with shaping speeds exceeding copper by over 50%. This is particularly significant for quick turnaround times in mobile phone mold production. For surfaces requiring a finish of less than VDI 18, copper electrodes can be used to meet specifications.

The EDM machines are equipped with EROWA or 3R quick clamping systems and have developed an automatic discharge system. All electrodes, including inclined gate electrodes, can be processed without the need for minute calibration or manual data entry. The electrode discharge data is generated in bulk using UG software, eliminating the need to input discharge parameters manually. The operator only needs to enter the electrode number into the machine, enabling fully automated discharge machining. This setup can save approximately two hours of clamping time per machine each day, allowing operators to increase from managing two machines to three without compromising quality. This also minimizes errors caused by manual input of discharge parameters.

If the company has sufficient funding, external pre-setting stations can be utilized to calibrate and center workpieces before machining, further reducing clamping time.

  • (1) Collaboration with programming to achieve paperless operations, reducing costs and enhancing efficiency.

  • (2) Secondary development to automate, program, and standardize EDM discharge processes. The basic concept involves the operator installing the electrode, centering the workpiece, and opening the automatically generated CNC file to perform automatic discharge. This includes automatic completion of XYZ data and setting discharge parameters such as current pulse width.

  • (3) Operators engage in foolproof operations, processing according to the program without the need to modify settings, thus preventing human errors.

  • (4) Strict enforcement of the three inspections and the three no’s.

5. Grinding and Polishing Team

Turning, milling, grinding, and drilling are essential components of the mold production department.

  • Lathes are primarily used for processing external shapes, internal holes, threads, and circular materials.
  • Milling machines are used for creating ejector pin holes, screw holes, water channels, spring holes, tapping, and rough machining of mold components.
  • Grinding machines are utilized for the precision finishing of mold component shapes, capable of processing a variety of hard and super-hard materials.
  • Drilling machines are mainly employed for drilling water channels.

The grinding and polishing team relies on purely manual processes, with one operator per machine. Due to low production efficiency during night shifts, coupled with the lower costs and depreciation rates of the machines, night shifts for production are not advisable. During regular working hours, the focus is primarily on mold production. When not busy, standard mold components can be produced for inventory, which can later be used during mold assembly. If these standard mold components can be used extensively, it will significantly reduce part processing time and shorten the overall mold production cycle.

  1. Training Employees on Grinding Techniques: Employees should be trained to understand the common causes of grinding and milling defects and methods to prevent them.

  2. Training on Tools and Gauges: Employees need to learn about the structure, use, adjustment, and maintenance of commonly used tools, fixtures, and measuring instruments.

  3. Training on Tool Types and Specifications: Employees should be familiarized with the types, grades, specifications, performance, and maintenance of common cutting tools and grinding wheels.

  4. Training on Metal Materials: Employees should understand the types, grades, milling and grinding performance, and thermal expansion characteristics of various metal materials.

  5. Blueprint Reading Training: Employees should be trained in interpreting mold drawings and using trigonometric functions for calculations and applications.

  6. Training on Machine Specifications: Employees need to learn about machine specifications, performance, structure, transmission systems, and adjustment methods.

6. Mold Assembly Team

Assembly is the final process after all machining is completed and holds a crucial position in the entire mold manufacturing process. For the production of precision molds, the management of the assembly workshop and the requirements for operators are extremely strict. This is reflected in the product quality standards, precision data for mold components, and surface maintenance, along with the necessity for operators to possess strong quality awareness and skillful operation techniques.

Assembly operations are manual tasks that require clear thinking and meticulous craftsmanship. Before receiving the components for assembly, each adhesive area, corner, and assembly position must be checked for omissions or errors. Careful attention to technique is essential during assembly; for example, grinding tools should not be used during fitting, although minor areas may be smoothed using sandpaper or oil stones to eliminate tool marks.

  1. Establish Standard Operating Guidelines: Develop a standard “Mold Assembly Operation Guide” that provides instructions for fitting operations related to guide pins, inserts, inclined tops, and mold cores.

  2. Develop and Improve a Technical Manual: Create and refine a “Mold Assembly Technical Manual” that collects past and known assembly cases to serve as training materials for regular instruction.

  3. Monthly Summaries and Training: Conduct monthly reviews of anomalies and experiences, requiring each master craftsman to prepare PPT training materials for knowledge sharing.

7. Mold TE (Technical Engineering) Team

The TE team’s modification solutions are crucial for mold quality and efficiency. In some mold factories, a lack of technical expertise among TE staff can lead to frequent repairs, often resulting in over ten modifications per mold, aside from customer-requested changes. The high frequency of reworking molds drives up costs, with each modification costing thousands, sometimes up to tens of thousands, which can be a major factor affecting profitability in mold manufacturing.

  1. Detailed Solutions for Common Mold Issues: Develop categorized and comprehensive solutions for frequent mold issues such as burrs, shrinkage, warping, weld lines, and ejector marks.

  2. Root Cause Analysis for Dimensional Adjustments: When making size adjustments, begin by inspecting the 3D steel material, then the product, followed by injection molding parameters, systematically identifying the root cause.

  3. Learning from Repair Experiences: TEs must regularly review each unsuccessful mold modification to analyze the causes, aiming to eliminate trial-and-error approaches and establish well-informed repair solutions.

 

8. Process Planning Team

The planning team plays a crucial role in controlling the overall progress and delivery of molds. The choice of processes directly affects mold precision, efficiency, and the quality of the final product. Each part has its unique machining methods, which must be considered alongside cost, operational complexity, and time efficiency to create a rational workflow.

  1. Detailed Progress Schedule: Develop a comprehensive timeline that includes all stages such as design, material ordering, arrival of materials, mold blanks, drawings, standard parts, loose components, cores, inserts, ejectors, pressure blocks, and wear-resistant plates, detailing each step of the machining process.

  2. Timely Process Monitoring: Conduct daily checks against the schedule to ensure each part’s status is accurately tracked and updated.

  3. Visual Process Documentation: Create detailed process flowcharts (through secondary development) that outline machining plans for front molds, rear molds, ejectors, and inserts. Specify the sequences and steps for programming, CNC, milling, grinding, wire cutting, spark erosion, turning, and drilling operations to minimize waiting times and enhance workflow efficiency.

III. Specific Management Methods

  1. Machinery and Equipment

    1. Detailed Equipment Manuals: Gain an in-depth understanding of each machine’s performance and operation to create a “Machine Operation Guide” for each machine, ensuring technicians can use them effectively and efficiently.

    2. Common Alerts and Solutions: Compile frequent operational alerts and their solutions into a “Common Alerts and Solutions Guide” and train all operators, enabling them to troubleshoot common issues.

    3. Maintenance and Consumable Guidelines: Develop a “Machine Maintenance Program” based on manufacturer recommendations and real-world requirements to ensure machines maintain consistent accuracy.

  2. Tools and Fixtures

    1. Gauging and Measuring Tool Management: Provide a “Tool Usage and Maintenance Guide” for indicators, center rods, calipers, tool setters, electronic probes, and sine tables. Ensure technicians know how to use and maintain tools properly, with disciplinary measures for misuse or damage.

    2. Fixture Management: Regularly grind fixtures such as round irons, clamp boards, and clamps to maintain accuracy (and record any size adjustments). Create a “Fixture Usage and Maintenance Guide” for items like vises, magnets, EROWA, and wire-cutting fixtures so every technician can use them proficiently.

    3. Tool Management: To maintain accuracy and manage costs, centralize the storage of cutting heads, collets, tool holders, cutting tools, and inserts. Separate storage for rough, semi-finished, and finished tools, as well as the workshop and inventory. Regularly conduct tool inventories, reconciliation, and purchase requests, and record evaluations of new tools to understand the efficiency of different tools on various materials.

  3. Computer Systems

    1. Network Configuration: Set up a local network within the company, with access restrictions for supervisors, office staff, programmers, and transmission computers.

    2. Software and Hardware: Equip computers according to job requirements, installing only work-related software to prevent misuse of company resources.

    3. Document Management: Establish a “Document Management Standard” with uniform naming conventions for easy organization and retrieval.

  4. 5S Workshop Environment Management

    Good work environments contribute to high-quality production. Establish cleaning schedules and assign responsibilities for each area to maintain a clean and organized workspace, adhering to the 5S principles:

    • Sort (Seiri): Clear out unnecessary items.
    • Set in Order (Seiton): Arrange items in a structured way.
    • Shine (Seiso): Regular cleaning.
    • Standardize (Seiketsu): Maintain cleanliness and organization.
    • Sustain (Shitsuke): Foster discipline and habit.
  5. Production Site Management

    1. Area Designation and Labeling: Define and label zones such as machinery areas, clamping zones, in-progress and completed work areas, tool cabinets, and walkways. Assign cleanliness and order responsibilities to specific individuals and implement a “Workshop 5S Management Standard.”

    2. Transparency in Management: Display daily production schedules, production status, summaries, quality metrics, and efficiency benchmarks on a workshop bulletin board to foster a collaborative and motivated environment.

6. Personnel Management

Effective hardware resources require skilled operators, as personnel quality directly impacts efficiency and product quality. Improving technician qualifications can focus on five key areas:

  1. Work Attitude: Cultivate a positive work environment through effective communication. Foster a team spirit by building rapport and encouraging a responsible, detail-oriented work ethic.

  2. Basic Knowledge: Ensure all technicians understand fundamental practices, such as part orientation and calibration procedures. Use warning signs and standard operation methods to prevent basic errors.

  3. Skills Training: Develop operation manuals for various machines and provide on-site training for new hires, while experienced staff should mentor them to promote seamless production.

  4. Quality and Efficiency Awareness: Instill a sense of responsibility for product quality by establishing clear quality standards for components. Analyze and address issues with non-conforming products, documenting preventive measures to avoid recurrence.

  5. Promotion Management: To retain talented programmers, consider transferring high-performing technicians from other departments after 1-3 years, fostering motivation and growth.

  6. Absolute Obedience: Emphasize the importance of following management directives without delay or dissent.

7. System Regulations

To complement hardware and personnel quality, clear regulations are essential for creating a fair and positive work atmosphere:

  1. Communication Protocols: Implement “handover forms” during workflow transitions to ensure clear communication.

  2. Daily Reporting: Require employees to complete “Daily Work Reports” to track machine utilization, performance evaluations, and cost statistics.

  3. Performance Standards: Use daily reports to assess and enhance employee performance.

8. Technical Reserves

In a technical field, it’s crucial to develop a pool of key personnel and create a valuable repository of technical documentation to ensure efficient production continuity despite personnel changes:

  1. Machine Operation Manuals.

  2. Work Procedures for Technicians.

  3. Programming Technical Documents.

9. Production Arrangements

The company’s profitability stems from product manufacturing; thus, effective workshop management is vital for high-quality output:

  1. Production Planning: Upon receiving customer orders, promptly hold processing review meetings to create detailed timelines for every stage, including material procurement, design, programming, and assembly.

  2. Progress Monitoring: Conduct regular department meetings to review production status and adjust schedules in line with overall plans.

  3. Network Management: Implement a computer network to log each part’s status and regularly patrol the workshop to resolve issues. Ensure strict self-inspection for completed parts and maintain inspection records.

  4. Data Tracking: Monitor each mold’s progress closely, ensuring accurate and comprehensive data entry into the computer system for transparent access by authorized personnel.

  5. Weekly Reviews: Summarize departmental production performance, analyze deviations, and share new process learnings to foster a transparent understanding of areas for improvement.

 
 

4. Salary and Benefits

In the context of salary structures, several approaches can be considered to balance employee motivation with quality assurance:

  1. Base Salary + Hourly Bonuses:

    • Advantages: This model can enhance employee motivation and effectively boost production output, as workers are incentivized to complete more tasks.
    • Disadvantages: It may compromise quality, as employees might prioritize task completion over meticulous work. This approach is less suitable for producing high-precision molds, where quality is critical.
  2. Base Salary + Allowances + Overtime Pay:

    • Considerations:
      • Overtime pay must be set at a reasonable rate.
      • Excessively high overtime rates can lead to inefficiency, as employees might defer tasks to their overtime hours, inflating labor costs without guaranteeing productivity.
      • Conversely, if overtime pay is too low, employees may be disincentivized from working extra hours, leading to decreased responsibility and diminished productivity and quality.
  3. Finding Balance:

    • The key is to strike a balance in overtime pay that encourages productivity while maintaining high standards of quality. Regular assessments of workload, performance, and employee feedback can help adjust compensation structures to ensure they align with both company goals and employee satisfaction.

By establishing a fair and motivating compensation system, the company can foster a culture of accountability and quality, essential for success in high-precision mold manufacturing.

5. Summary

No matter how well-designed the systems and processes are, they are ineffective without proper oversight and execution. Team building is crucial, as talent is hard to come by. For a company to be profitable and grow, it must focus not only on the volume of orders but also on the quality of products and adherence to delivery schedules.

Achieving these goals requires a team of skilled technicians and responsible individuals. A robust organizational structure is essential, where high-performing employees are recognized with promotions and salary increases, while underperformers are decisively removed. The management must maintain a clear distinction between rewards and penalties to foster an environment of accountability and continuous improvement.

In summary, a successful company thrives on a combination of strong leadership, clear processes, and a motivated workforce committed to excellence.

Team SPI
This article was written by various SPI contributors. SPI is a leading resource on manufacturing with CNC machining, sheet metal fabrication, 3D printing, injection molding, urethane casting, and more.