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Procurement Glossary
Tooling Release: Process for Quality Assurance in Production
March 30, 2026
Tool approval is a critical quality assurance process in procurement and production in which tools, molds, and fixtures are systematically inspected and approved before series use. This process ensures that all production equipment meets the specified requirements and can produce quality-capable parts. Below, learn what tool approval includes, which methods are used, and how you can minimize risks.
Key Facts
- Systematic inspection and approval of production tools before series use
- Includes dimensional measurements, material testing, and functional verification
- Reduces quality risks and rework costs in series production
- Documents tool quality for supplier evaluation and audit purposes
- Integral part of series launch management
Content
Definition: Tool Approval
Tool approval refers to the structured validation process through which production tools receive their official authorization for series use.
Core Elements of Tool Approval
The approval process includes several essential components:
- Dimensional measurement of all critical tool dimensions
- Material testing and hardness measurements
- Functional testing under production conditions
- Documentation of all test results
Tool Approval vs. Sampling
While Prototype Procurement creates initial functional samples, tool approval validates the final production equipment. It takes place after Tooling Procurement and before Start of Production (SOP).
Importance of Tool Approval in Procurement
For procurement, tool approval is a key quality instrument that minimizes supplier risks and prevents production failures. It forms the basis for Tooling Deposit and supplier evaluations.
Methods and Procedures
Tool approval follows standardized methods that ensure systematic and traceable validation.
Step-by-Step Approval Procedures
The approval process is divided into sequential phases:
- Initial sample inspection with dimensional measurement
- Functional testing under production conditions
- Long-term test for wear assessment
- Final approval documentation
Inspection Criteria and Standards
The evaluation is based on defined criteria such as dimensional accuracy, surface quality, and service life. Industry-specific standards such as APQP or VDA are applied, which are also relevant in the Production Release Process.
Digital Documentation
Modern tool approvals use digital systems to capture and manage all inspection data. This enables complete traceability and supports Ramp-Up Management through fast data analysis.
Important KPIs for Tool Approvals
KPIs enable the objective evaluation and continuous improvement of the tool approval process.
Lead Time KPIs
The approval time from tool receipt to final approval is a key indicator. Typical target values are 5-10 working days for standard tools. Delays indicate process weaknesses or supplier problems and affect Ramp-Up Management.
Quality KPIs
The first-time approval rate measures the share of tools approved immediately without rework. Values above 85% are considered good; lower rates indicate quality problems. In addition, the number of approval iterations per tool is recorded.
Cost KPIs
Approval costs per tool and rework costs resulting from approval errors are systematically recorded. These KPIs support Make-or-Buy Decision and the evaluation of testing service providers. Typical approval costs amount to 2-5% of tool costs.
Risks, Dependencies, and Countermeasures
Tool approval involves various risks that can be minimized through appropriate measures.
Quality Risks
Incomplete or faulty approvals lead to quality problems in series production. Defective tools produce scrap and jeopardize delivery deadlines. Countermeasures include standardized inspection plans and independent validation by external testing laboratories.
Time Risks in the Project Timeline
Delays in tool approval postpone the entire Start of Production (SOP). Dependencies on Tooling Procurement and complex tools are especially critical. Risk minimization is achieved through time buffers and parallel approval processes.
Supplier Dependencies
Tool approval is highly dependent on supplier capacities and competencies. Insufficient testing equipment or a lack of expertise at the supplier delays approvals. Supplier Feasibility Review and supplier audits reduce these risks through early competency assessment.
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Practical Example
An automotive supplier carries out tool approval for an injection molding tool used to manufacture dashboard components. After delivery of the tool, all critical dimensions are first measured using 3D coordinate measuring technology. Then, 50 initial samples are produced and tested under series conditions. The parts undergo dimensional, shape, and surface inspections as well as functional tests. After successful validation, the tool is approved for series production and the documentation is forwarded to quality assurance and production.
- 30% reduction in ramp-up time through structured approval
- Avoidance of quality problems in series production
- Complete documentation for audit purposes
Current Developments and Impacts
Tool approval is continuously evolving through technological innovations and changing market requirements.
Digitalization and AI Integration
Artificial intelligence is revolutionizing tool approval through automated image analysis and predictive analytics. AI systems detect deviations faster than manual inspections and predict tool wear. This reduces inspection times and increases forecasting accuracy for maintenance intervals.
Inline Metrology
Integrated measurement systems enable continuous tool monitoring during production. This development shortens approval cycles and supports Ramp-Up through real-time data on tool performance.
Sustainability Aspects
Environmental awareness is increasingly shaping approval processes. Tool materials and coatings are checked for sustainability, while extended service lives reduce resource consumption. This also affects decisions between Insourcing and Outsourcing of tool manufacturing.
Conclusion
Tool approval is an indispensable quality assurance process that makes a significant contribution to the success of series production. Systematic validation minimizes quality risks and prevents production failures. Modern technologies such as AI and inline metrology are revolutionizing the approval process and enabling more efficient workflows. Companies should invest in structured approval processes in order to reduce costs in the long term and secure competitive advantages.
FAQ
What is the difference between tool approval and sampling?
Sampling validates initial prototypes and functional samples, while tool approval inspects the final production tools before series use. It takes place later in the development process and focuses on the tools' suitability for series production and quality capability.
Who is responsible for tool approval?
Responsibility typically lies with procurement in cooperation with quality assurance and production. The supplier provides the tool and test documentation, while the customer makes and documents the final approval decision.
What costs arise during tool approval?
The costs include testing equipment, personnel, material consumption for samples, and external testing services. They typically amount to 2-5% of tool costs, but may be higher for complex tools. Investments in thorough approvals significantly reduce later quality costs.
How long does a typical tool approval take?
The duration varies depending on tool complexity between 5-15 working days. Simple tools can be approved more quickly, while complex multi-cavity tools or tools for safety-critical parts require longer inspection times. Parallel inspection processes can reduce the overall duration.
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