For global customers seeking high-precision granite base components, understanding the professional processing workflow is crucial to ensuring product quality and meeting application requirements. As a professional manufacturer of granite mechanical components (ZHHIMG), we adhere to strict processing standards and scientific production processes to provide customers with reliable, high-precision granite base products. Below is a detailed introduction to the processing and lapping process of granite base components, as well as key considerations.
1. Precondition for Processing: Dependence on Design Drawings
The processing of granite base components is a highly customized and precision-oriented work, which completely relies on the customer’s detailed design drawings. Unlike simple parts that can be produced with basic parameters such as hole spacing and shape, granite base components involve complex structural requirements (such as the overall shape, the number, position, and size of holes, and the matching accuracy with other equipment). Without a complete design drawing, it is impossible to ensure the consistency between the final product and the customer’s actual application needs, and even minor deviations may lead to the failure of the component to be installed or used normally. Therefore, before starting production, we must confirm the complete design drawing with the customer to lay a solid foundation for subsequent processing.
2. Selection of Granite Slabs: Based on Precision Grade Requirements
The quality of granite slabs directly determines the precision stability and service life of the final base component. We select slabs strictly according to the precision grade of the granite base, ensuring that the physical properties (such as hardness, density, thermal stability, and wear resistance) of the material meet the corresponding standards.
- For granite bases with strict precision requirements (higher than 00 grade): We use high-quality “Jinan Qing” granite. This type of granite has excellent physical properties, including high density (≥2.8g/cm³), low water absorption (≤0.1%), and strong thermal stability (small thermal expansion coefficient). It can maintain high flatness and precision stability even in complex working environments, making it an ideal material for high-precision mechanical components.
- For granite mechanical components or platform plates with a precision grade of 0 grade: We select “Zhangqiu Hei” granite. This type of granite is produced in Zhangqiu, Shandong, and its physical properties (such as hardness, wear resistance, and structural uniformity) are very close to “Jinan Qing”. It not only meets the precision requirements of 0-grade products but also has a high cost-performance ratio, which can effectively reduce the customer’s procurement cost on the premise of ensuring quality.
3. Processing and Lapping Process: Strictly Following Scientific Procedures
The processing and lapping of granite base components involve multiple links, each of which requires strict control to ensure the final product precision. The specific process is as follows:
3.1 Rough Cutting and Rough Grinding: Laying the Foundation for Precision
After selecting the appropriate granite slab, we first use professional equipment (such as forklifts or cranes) to transport the slab to the stone cutting machine for overall shape cutting. The cutting process adopts high-precision numerical control technology to ensure that the overall dimension error of the slab is controlled within a small range. Then, the cut slab is transferred to the CNC grinding machine for rough grinding. Through the rough grinding process, the surface of the slab is initially leveled, and the flatness of the component can reach within 0.002mm per square meter after this link. This step lays a good foundation for the subsequent fine grinding and ensures that the subsequent processing can be carried out smoothly.
3.2 Static Placement in Constant Temperature Workshop: Release Internal Stress
After rough grinding, the granite component cannot be directly transferred to the fine grinding process. Instead, it needs to be statically placed in a constant temperature workshop for 1 day. The reason for this operation is that during the rough cutting and rough grinding process, the granite slab will be affected by mechanical force and temperature changes, resulting in internal stress. If the component is directly subjected to fine grinding without releasing the internal stress, the internal stress will be released slowly during the subsequent use of the product, which may cause deformation of the component and damage the precision. The constant temperature workshop (temperature control range: 20±2℃, humidity control range: 45±5%) can provide a stable environment for the release of internal stress, ensuring that the internal stress of the component is fully released and the structural stability of the component is improved.
3.3 Manual Lapping: Gradual Improvement of Surface Precision
After the internal stress is fully released, the granite component enters the manual lapping stage, which is a key link to improve the surface precision and flatness of the component. The lapping process adopts a step-by-step method, and different types and specifications of lapping sand are used according to the actual precision requirements:
- First, coarse sand lapping: Use coarse-grained lapping sand (such as 200#-400#) to further level the surface of the component and eliminate the surface defects left by rough grinding.
- Then, fine sand lapping: Replace with fine-grained lapping sand (such as 800#-1200#) to polish the surface of the component, reducing the surface roughness and improving the surface finish.
- Finally, precision lapping: Use ultra-fine-grained lapping sand (such as 2000#-5000#) for precision processing. Through this step, the surface flatness and precision of the component can reach the preset precision grade (such as 00 grade or 0 grade).
During the lapping process, the operator must strictly control the lapping force, speed, and time to ensure the uniformity of the lapping effect. At the same time, the lapping sand must be replaced in a timely manner. Using the same type of lapping sand for a long time will not only fail to improve the precision but also may cause scratches on the surface of the component.
3.4 Flatness Inspection: Ensuring Precision Qualification
After the fine lapping is completed, we use a high-precision electronic level to inspect the flatness of the granite base component. The inspection process adopts a regular sliding method: the electronic level is placed on the surface of the component, and the data is recorded by sliding along the preset path (such as horizontal, vertical, and diagonal directions). The recorded data is analyzed and compared with the precision grade standard. If the flatness meets the standard, the component can enter the next process (drilling and insert setting); if it does not meet the standard, it is necessary to return to the fine lapping stage for reprocessing until the precision is qualified. The electronic level we use has a measurement accuracy of up to 0.001mm/m, which can accurately detect the flatness of the component and ensure that the product meets the customer’s precision requirements.
3.5 Drilling and Insert Setting: Strict Control of Hole Position Accuracy
Drilling and insert setting are the final key links in the processing of granite base components, and the accuracy of hole position and the quality of insert setting directly affect the installation and use of the component.
- Drilling process: We use high-precision numerical control drilling machines for drilling. Before drilling, the position of the hole is accurately positioned according to the design drawing, and the drilling parameters (such as drilling speed and feed rate) are set according to the hardness of the granite. During the drilling process, we use cooling water to cool the drill bit and the component to prevent the drill bit from overheating and damaging the component, and also to reduce the occurrence of cracks around the hole.
- Insert setting process: After drilling, it is necessary to clean and level the inside of the hole first (remove the debris and burrs in the hole to ensure the smoothness of the hole wall). Then, the metal insert (usually made of high-strength steel or stainless steel) is embedded into the hole. The fit between the insert and the hole must be tight, and the top of the insert must be flush with the surface of the component to ensure that the insert can bear the load and avoid affecting the installation of other equipment.
It should be noted that the drilling process of granite base components has high requirements for accuracy. Even a small error (such as a hole position deviation of 0.1mm) may lead to the failure of the component to be used normally, and the damaged component can only be scrapped, and a new granite slab needs to be selected for reprocessing. Therefore, during the drilling process, we have set up multiple inspection links to ensure the accuracy of the hole position.
4. Why Choose ZHHIMG for Granite Base Component Processing?
- Professional Technical Team: We have a team of experienced engineers and technicians who are familiar with the properties of various granite materials and the processing technology of precision components, and can provide professional technical support and solutions according to the customer’s needs.
- Advanced Processing Equipment: We are equipped with a full set of advanced processing equipment, including CNC cutting machines, CNC grinding machines, high-precision electronic levels, and CNC drilling machines, which can ensure the precision and efficiency of processing.
- Strict Quality Control System: From the selection of slabs to the final product inspection, we have established a strict quality control system, and each link is supervised by a dedicated person to ensure that the quality of each product meets the standard.
- Customized Service: We can provide customized processing services according to the customer’s design drawings and precision requirements, and flexibly adjust the processing process to meet the diverse needs of customers.
If you have a demand for granite base components and need a professional manufacturer to provide processing services, please feel free to contact us. We will provide you with detailed product information, technical solutions, and quotation services, and work with you to create high-quality, high-precision granite mechanical components.
Post time: Aug-24-2025