CNC forging equipment quality appraisal

CNC forging equipment is the core equipment for realizing metal material forming through digital control. It is widely used in automobile manufacturing, aerospace, energy and other industries. Compared with traditional forging machinery, CNC forging equipment relies on servo drive technology, closed-loop control algorithms and multi-axis linkage functions to control the dimensional tolerance of forgings within ±0.1mm and increase production efficiency by more than 40%. It is a key equipment in the high-end manufacturing field and directly affects the development of major national projects and strategic emerging industries.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for CNC forging equipment. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for CNC forging equipment quality appraisal.

With industrial upgrading and supply chain complexity, CNC forging equipment quality disputes occur frequently. The judicial dispute focuses on:

1, performance index disputes: such as whether the nominal pressure meets the standard, and the repeated positioning accuracy of the slider is out of tolerance;

2, material and process defects: mold material degradation, heat treatment process Failure to meet standards leads to cracking;

3. Control system failure: lack of dynamic compensation function for forging force, logical loopholes in human-machine interface parameter setting;

4. Contract performance issues: delivered equipment does not match the technical agreement.

CNC forging equipment quality appraisal technical methods include:

1, material performance testing

using a spectrometer to detect the fuselage material and verify the heat treatment process; detect internal defects in the frame welds through ultrasonic flaw detection, and evaluate surface cracks through magnetic particle testing.

2, geometric accuracy verification

The laser interferometer measures the parallelism of the slide rail and the flatness of the workbench; the three-coordinate measurement of the mold cavity size verifies the consistency with the forging design drawings.

0 Scanning electron microscope (SEM) was used to observe the mold fracture surface morphology, and energy dispersive spectrometer (EDS) was used to detect inclusion components; based on predicting the high-temperature rheological behavior of the material, the feasibility of the forging process was evaluated.

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A heavy industry enterprise of the applicant signed a "CNC Hot Die Forging Press Purchase Contract" with a machine tool company of the respondent, agreeing to purchase two pieces of equipment with a nominal pressure of 2,500 tons for automobile crankshaft forging. After being put into production, the forgings had defects such as excessive flash (≥2mm) and surface folding, resulting in customer returns. The heavy industry enterprise believed that the equipment had design defects and demanded compensation for losses. The machine tool company argued that the problem stemmed from improper operation, and both parties went to court.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "CNC forging equipment", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

1, the body material of the CNC forging equipment involved is Q235 steel (contract requirements) Q345B), the yield strength is only 235MPa (standard ≥345MPa), resulting in frame deformation; the mold material is 42CrMo (contract requirement H13), the quenching hardness is HRC48 (standard ≥HRC52), and the wear resistance is insufficient.

2. The slide guide length of the CNC forging equipment involved in the case was too short (design value 1200mm, actual 800mm). The lateral force during forging caused the mold to dislocate; the ejection mechanism was not equipped with a buffer device, and the impact force caused surface damage when the forging was demoulded.

CNC forging equipment quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).