Quality appraisal of billet making equipment

blank making equipment is a key equipment used in industrial production to process raw materials into semi-finished blanks. It is widely used in ceramics, building materials, metal processing and other fields. Its typical application scenarios include: ceramic industry: pressing and molding of ceramic tiles and sanitary ware products; concrete prefabricated parts: automated production of pipe piles and wall panels; automotive parts: gravity casting of aluminum alloy wheel hub blanks.

my country's brick making equipment market exceeds 30 billion yuan, and technical standards cover "Brick Making Machinery", "Concrete Structure Engineering Construction Quality Acceptance Code", etc.

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

In the case of blank making equipment quality disputes, the focus of judicial disputes is:

1, performance index disputes: molding pressure stability, blank size deviation; mold life, demoulding efficiency;

2, materials and processes Technical defects: Insufficient wear resistance of the mold material; pressure attenuation caused by leakage in the hydraulic system;

3. Control system failure: logic loopholes in automatic cloth accuracy and pressure holding time control;

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

blank making equipment quality appraisal technical methods include:

1. Material performance inspection: test the mechanical properties, physical properties, chemical composition, etc. of the materials used in the equipment.

2. Structural design review: Analyze whether the structural design of the equipment complies with relevant standards and whether there are potential defects.

3. Process flow evaluation: Check whether the production process of the equipment is reasonable and whether there are improper operations or process defects.

4. Functional performance testing: By simulating actual production conditions, the functional performance of the equipment is tested to evaluate its stability, accuracy and efficiency.

A ceramics company of the applicant signed a "Fully Automatic Brick Press Purchase Contract" with an equipment company of the respondent, agreeing to purchase 5 pieces of equipment with a nominal pressure of 3,000 tons. After being put into production, the thickness deviation of the green body reached ±3mm and the strength was only 35MPa (contract requirement ≥45MPa), resulting in a 20% drop in yield. The ceramic company believed that the equipment had a design defect and demanded compensation for losses.

Identification analysis results:

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

The mold material of the blank making equipment involved in the case is 42CrMo (contract requirement H13), and the hardness is only HRC40 (standard ≥HRC48), insufficient wear resistance; the material of the hydraulic cylinder sealing ring is ordinary nitrile rubber (contract requires fluorine rubber), aging at high temperatures causes leakage; the pressure holding time is only 8 seconds (designed 15 seconds), and the compactness of the green body is insufficient.

The equipment company failed to provide molds and fluororubber seals that met the requirements in accordance with the contract, and the control system parameter settings were incorrect, which was the main reason for the equipment problems.

The blank making 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.).