GB/T 28615-2012Green manufacturing - The technology specification for metal-cutting machine tool remanufacturing (English PDF)

3.1 Machine tool remanufacturing

Machine tool manufacturing mode that is based on recycling of waste machine tool resources. Use modern and advanced manufacturing, information, numerical control and automation technologies to conduct remanufacturability evaluation, disassembly and innovative redesign, reprocessing and reassembly of waste machine tools, to manufacture new machine tools whose functions and performance have been restored or improved and which meet the requirements of green manufacturing.

NOTE: Green manufacturing requirements refer to product resource consumption, ecological environment, occupational health and safety requirements.

3.2 Remanufactured machine tool

The machine tool that is based on waste machine tools and parts, the function and performance of remanufacturing can reach or exceed the level of original new products.

3.3 Machine tool disassembly

The process of decomposing the original waste machine tool assembly into individual parts and components by decomposing the connecting parts and assembly relationship by using certain tools and means.

3.4 Redesign

The process that redesigns remanufactured products and their parts by means of function enhancement and technical condition optimization, based on waste products and recycled class.

4.5 Cleaning, testing

The disassembled parts and systems must be cleaned and tested to determine their failure, wear and aging conditions. Analyze the feasibility of its reuse or remanufacturing from the aspects of economy, technology, resources, environment.

4.6 Redesign of machine tools

According to the requirements of the overall scheme of machine tool remanufacturing, design the structure and components of the remanufactured machine tool. The design documents should be formed.

4.7 Formulation of remanufacturing process plan for mechanical parts

According to the test results of waste parts and the technical requirements for parts of remanufactured machine tools, determine the remanufacturing process equipment, process parameters of the parts, and formulate remanufacturing process regulations.

4.8 Formulation of remanufacturing technology plan for electrical control system

The electrical control system plan should be formulated according to the overall plan of machine tool remanufacturing, including electrical schematic diagrams, electrical location diagrams, and selection of electrical components. After the plan is formulated, technical documents must be formed.

4.9 Assembly and commissioning

Remanufactured machine tools should be assembled according to the drawings and reassembly process regulations. The parts (including remanufactured parts and replacement parts) assembled on the remanufactured machine tool should meet the quality requirements. The reassembly process and reassembly quality of remanufactured machine tools should comply with the provisions of JB/T 9874.

4.10 Inspection and acceptance of remanufactured machine tools

The inspection and acceptance of remanufactured machine tools should be carried out in accordance with the provisions of GB/T 9061. The main contents of inspection and acceptance include:

a) Appearance inspection;

b) Inspection of accessories and tools;

c) Parameter inspection;

d) Idle operation test of machine tools;

e) Load test of machine tools;

f) Precision inspection of machine tools;

g) Processing and assembly quality inspection; h) Others.

4.11 Accompanying technical documents

The accompanying technical documents for remanufactured machine tools should include instruction manual that meets the requirements of GB/T 9969, certificate of conformity, packing list, original machine tool and its remanufactured parts blank performance and quality condition inspection report, remanufacturing statement card.

The compilation method of technical documents such as instruction manual, certificate of conformity and packing list should comply with the provisions of GB/T 23571. The remanufacturing statement card should indicate the manufacturer of the original machine tool, the name, serial number and quantity of the remanufactured parts.

4.12 Packaging

The packaging of the machine tool should comply with the provisions of GB/T 191,

JB/T 8356.1, JB/T 8356.2, and JB/T 3207.

5.1 General requirements

5.1.1 The basic dimensions and tolerances of remanufactured mechanical parts should be restored to the original design requirements or meet the interchangeability technical requirements stipulated in national standards.

5.1.2 For remanufactured parts that do not meet the technical requirements for interchangeability, their drawings and technical documents should establish corresponding permanent files and provide them to the user as accompanying information.

5.1.3 Wear-resistant measures should be taken for the main parts such as guide rail pairs, spindles, lead screws, worm pairs and high-speed and heavy-duty gear pairs that are important and easy to wear for remanufactured machine tools. Improve the working life and meet the technical requirements.

5.2 Structural parts such as machine bed and box

If there are cracks, nicks and other defects on the surface of the bed, base, box and other structural parts, they can be repaired by surface treatment or mechanical processing

5.18 Pneumatic system

5.18.1 The parts in the pneumatic system should be disassembled, flushed, cleaned and inspected.

5.18.2 Broken or damaged parts should be replaced. Hoses and defective piping systems should be replaced.

5.18.3 The air pressure relief valve should be replaced with a new pneumatic diaphragm and reassembled.

5.18.4 The cylinder should be disassembled and inspected for wear and scratches. It should be replaced if it is defective.

5.18.5 The pneumatic system of the remanufactured machine tool should comply with the national standards, such as GB/T 7932.

5.19 Cooling system

5.19.1 The cooling pump should be disassembled, cleaned, rebuilt or replaced.

5.19.2 The reservoir and channels of the cooling system should be thoroughly cleaned.

5.19.3 Rigid cooling lines should be cleaned, flushed and replaced if damaged or defective.

5.19.4 Hoses, shut-off valves, nozzles and filters should be replaced.

5.19.5 The cooling system of the remanufactured machine tool should ensure adequate and reliable cooling.

5.20 Protective devices

Remanufactured machine tools should be equipped with protective devices according to the provisions of GB 15760, such as shells, covers, screens, doors, closed protective devices.

6.1 Electrical system

Part of the electrical system should be removed and replaced with new components (meeting the requirements of existing standards, except for electrical equipment enclosures, wire ducts, rigid conduits). The remanufacturing of the electrical system should comply with the relevant provisions of GB 5226.1.

6.2 CNC system

The numerical control system adopted by the remanufactured machine tools should comply with the relevant provisions of GB/T 18759 and JB/T 8832.

6.3 Electrical wiring of machine tools

The machine tool should be completely rewired electrically. Replace all flexible bushings and switch elements on the machine tool.

6.4 Testing and feedback devices

The original testing and feedback devices (including encoders, decoders, grating rulers) should be replaced.

6.5 Motor

The motor should be tested. If there is a fault, it can be restored to its original standard by disassembly, cleaning, and remanufacturing. All bearings in the motor should be replaced. If the remanufactured motor cannot meet the technical requirements, it should be replaced with a new motor with better performance.

6.6 Driver

It should be replaced with a new drive with equivalent or better performance.

7.1 Accessories and tools

All accessories, such as material conveying system, chip conveyor, oil mist separator, suction cup, tailstock, turntable, should be provided according to user requirements and agreements. Accessories and tools should be marked accordingly.

The standard accessories and tools of remanufactured machine tools should ensure the interchangeability of functions and connecting parts.

7.2 Marks and nameplates

7.2.1 Remanufactured machine tools should have a clear remanufacturing mark. The mark should comply with the marking requirements for remanufactured products. […]