Processing Equipment: Focus on examining the brand, model, age, and maximum working travel of key equipment such as CNC machining centers, deep hole drilling machines, and grinding machines. Equipment precision (e.g., positioning accuracy, repeatability) and the level of automation (e.g., equipped with tool magazines, 4-axis/5-axis functionality) are crucial. For instance, large-scale gantry equipment capable of stably processing mold bases over 3 meters long is a hard requirement for handling large molds in the automotive and home appliance industries.

Process Capability: Understand whether the factory has mastered and proficiently applies advanced processes such as high-speed cutting, precision deep hole processing (e.g., for water lines), and 5-sided machining. Pay special attention to its techniques for handling high-hardness materials (e.g., pre-hardened steels like P20, 718), complex structures (deep cavities, thin walls), and controlling heat treatment deformation, as well as ensuring the flatness and parallelism of the mold base.

Inspection and QC Equipment: Precision processing requires precision measurement for guarantee. Check if the factory is equipped with high-precision inspection devices like Coordinate Measuring Machines (CMM), laser trackers, optical comparators, and surface roughness testers. Can their measurement accuracy meet micron-level control requirements (e.g., ±0.005mm)?

Team Composition: Evaluate the professional background and average years of experience of engineers, programmers, and technicians. An experienced team can deeply understand the design intent of the mold, the material properties, and their compatibility with processing techniques.

Problem-Solving and Knowledge Accumulation: When facing issues like dimensional deviations, deformation, or insufficient lifespan during processing, does the factory have systematic problem analysis processes (e.g., 8D report) and improvement mechanisms? Standardized process documentation, work instructions, and established databases for processing parameters and cutting tools are important indicators of stable technology transfer.

Technical Communication Skills: During initial communications, can the technical manager quickly understand your requirements and provide professional suggestions for design optimization or process improvements? This directly reflects their technical proficiency and application experience.

Process Control: Understand whether the entire process control is sound, from raw material (steel) inspection, first-article confirmation, in-process inspections, to final inspection. For critical dimensions, is Statistical Process Control (SPC) applied for monitoring to ensure consistency in batch production?

Precision and Standards: Request accuracy test reports for typical products to evaluate if their machining accuracy can be consistently maintained at high industry standards (e.g., within ±0.02mm for key areas of large mold bases). Inquire about the quality standards the factory adheres to (e.g., National standards, LKM standards, HASCO, DME).

System Certification: ISO9001 Quality Management System certification is a basic threshold. Specialized industry certifications (e.g., IATF 16949 for automotive) represent higher requirements.

Clients and Case Studies: Has the factory served well-known mold manufacturers or end-user brands in specific industries (e.g., automotive, home appliances, consumer electronics)? Request a factory tour or review past successful cases, especially examples of mold base processing similar to your product type.

Physical Product Evaluation: If possible, carefully inspect finished mold bases they have delivered. Observe the surface finish, fit and clearance between plates, details like hoisting ring holes, and especially examine the smoothness of deep hole inner walls and the accuracy of venting slots. These details often reveal the true level of processing.

Industry Reputation: Learn about the factory's on-time delivery rate, quality stability, and after-sales problem response speed through multiple channels such as industry exhibitions and supply chain partners.

Investment in Technology: Pay attention to whether the factory invests in areas like smart manufacturing (e.g., MES production management systems), process simulation and optimization, and the application of new tooling/coatings.

Customization and Solution Capability: Can they provide optimization solutions based on customer needs, such as mold base structure lightweighting or cooling efficiency improvement? Do they have development experience with special requirements like multi-cavity or stack molds?

Industry Engagement: Does the factory actively participate in industry associations and technical forums, or hold relevant technical patents? This reflects their technical activity and foresight within the industry.

On-site Management: During a site visit, observe the level of "6S" (Sort, Set in order, Shine, Standardize, Sustain, Safety) in the workshop. Is the equipment layout reasonable? Is the flow and management of materials, work-in-progress, and tools orderly? A clean site often signifies rigorous management.

Informatization Level: Understand if the factory uses an ERP system for order and material management, and an MES system for real-time tracking of production progress and quality data. Is there networked data transfer between programming and machine tools to reduce human error and improve efficiency?