Our Quality Control

Masion is a CNC machining manufacturer that integrates research and development, production, and sales. Our services include CNC turning, CNC milling, turning-milling compound machining, five-axis machining, Swiss Lathe CNC machining, 3D printing, precision CNC machining, and precision machining. We have a complete and scientific quality management system for CNC machining. We use high-quality machines for precision CNC milling and turning, precision EDM, precision grinding, and a series of other internal tools. We use AC power to stabilize the workshop temperature. In addition, with the experience and qualifications of our engineers and strict checks on machines and processes, we can ensure consistent quality even in the most demanding situations. We implement control over CNC machining quality in five key areas: the design of CNC machining schemes, programming, simulation checks, CNC quality control methods, tool applications and the establishment of a CNC machining technology team. Below, we will explain these five key areas in detail.

Design of CNC Machining Plan

The design phase of the CNC machining plan mainly includes the following contents: firstly, the determination of the type, size, and model of the parts to be machined, and the creation of part drawings. At the same time, the processability of CNC machining is analyzed to determine the process route of CNC machining. Then, the content of each process of CNC machining is clarified, and finally, the selection of CNC parameters and cutting tools is carried out. Compared with conventional machine tool machining, CNC machining is similar in design principles, but the control method of CNC machining is different, and it has a higher degree of automation and higher equipment cost. Therefore, it requires more rigorous and specific design content in process design, as well as strong adaptability.

CNC programming during CNC machining.

Programming is also a key step in CNC machining, and the instruction codes in the program directly affect the output results and have a critical impact on the machining quality of the parts. When programming, it is necessary to ensure that the mathematical model used in the machining process of the part is accurate and to define the coordinate system accurately. At the same time, it is important to set the correct programming of the CNC machine tool, the tool point, and the safe plane. In addition, the reasonable arrangement of each process and machining sequence in the machining plan is also crucial. The correct selection of tool type, tool path, and cutting amount is essential, and the use of instruction letters should accurately describe the syntax format of the CNC system of the machine tool. When selecting cutting parameters, it is important to consider the cutting characteristics of the tool itself, the machining characteristics of the material of the part, the machining allowance of the part, and the cutting characteristics of the machine tool. Finally, during the CNC machining process, it is important to ensure that the tool’s machining trajectory of the part does not cause the phenomena such as over-cutting, interference, collision, etc.

Simulation inspection process in CNC machining

Simulation inspection is also a key step in quality control for CNC machining. The content of simulation inspection mainly includes two parts: physical simulation and geometric simulation. In terms of physical simulation, people mainly simulate and analyze the physical phenomena generated during CNC machining to check whether the physical phenomena are reasonable. In terms of geometric simulation, virtual reality technology or 3D display technology can be used to realistically simulate the entire process of CNC machining to check whether there are geometric interference or collision problems and whether the tool path is correct when the machine is in motion. It can be said that the simulation inspection process is an important guarantee for ensuring the safety and accuracy of CNC machining. This step can effectively avoid various problems that may occur during the machining process, making CNC machining more scientific, efficient, and rational.

Methods and Tools for Quality Control in CNC Machining

In the application of quality control methods and tools in CNC machining, people should implement quality planning based on the CNC quality control system and its machining process. They should determine the CNC quality control points and index characteristic values for each process, then conduct actual investigations on the capabilities of each process and analyze and determine the relevant factors that affect the process. Subsequently, CNC quality control documents such as process management points and quality tables are prepared to enable the dynamic collection of quality indicators during the data machining process in real time, allowing the CNC quality control method to organize, analyze, and evaluate these quality indicator data. Finally, the conclusion is that the intervention control is implemented on the dominant factors that affect quality during actual CNC machining processes so that the CNC quality control objectives can be ultimately achieved.

Quality Inspection:

Our quality inspection process consists of several steps:

1. Incoming Inspection:

We have advanced measuring equipment and perform strict full-process inspection throughout the production process to ensure that every product meets the requirements of the drawings. Quality inspection includes incoming inspection, in-process inspection, pre-shipment inspection, and other third-party inspection and testing reports, as needed.
Generally, the raw materials we purchase come with material reports, but there is still a certain degree of risk. Therefore, we conduct self-inspection based on the materials and use material testing instruments to ensure the accuracy of the materials. If materials are used incorrectly, it will be fatal for us and our customers. We will not only fail to meet the delivery deadline but also lose a significant amount of costs. Therefore, we will prevent such incidents from happening at this point.

2. In-process Inspection:

Before clamping the workpiece, the machinist measures whether the size of the workpiece meets the requirements of the drawing. When clamping the workpiece, carefully check whether its placement is consistent with the programming operation guide.

Self-inspection should be carried out promptly after rough processing to adjust data with errors in time. The content of self-inspection mainly includes the positional size of the processing part.

1) Whether the workpiece is loose;
2) Whether the workpiece is correctly centered;
3) Whether the size of the CNC machining parts at the processing position to the reference edge (reference point) meets the requirements of the drawing:
4) The positional size of the CNC processing part to each other. After checking the positional size, measure the shape size of the rough processing (excluding the arc).

Only after self-inspection of rough processing can precision machining be carried out. After precision machining, the machinist should perform self-inspection of the shape and size of the machining part: for the machining part of the vertical surface, check its basic length and width size; for the machining part of the inclined surface, measure the base point size marked on the drawing.

The machinist completes a self-inspection of the workpiece and confirms that it complies with the drawing and process requirements before removing the workpiece for inspection by the inspector.

Inspection will inspect semi-finished products during machining to ensure product accuracy and sustainable processing.

Here the machinist and inspector will use calipers or micrometers to test the part dimension

Pre-shipment Inspection

1) 1.After CNC processing, if the accessories have burrs or peaks, it is necessary to remove the burrs and conduct a visual inspection to ensure that the product has a smooth appearance.
2) According to the product shape and tolerance requirements, precision instruments such as the 3 Coordinate Measuring Machine, project meter, height gauge, and micrometer are selected to measure all dimensions of the product to ensure that the product dimensions meet the customer’s drawing requirements.
3) 3.For products with strict tolerance requirements for anodizing and electroplating, there is a tolerance of 0.01mm, while for powder coating and painting, there is a tolerance of about 0.05mm. Therefore, we will conduct a second measurement of all surface-treated products to ensure that the size after surface treatment is within the precision range required by the customer. A comprehensive inspection of customer logos, product labels, and packaging to ensure they meet customer requirements.

X-ray Material Tester

The process of an X-ray material tester involves measuring the energy of various elements in a material to determine its quality by assessing the absorption of X-rays.

Coordinate measuring equipment

Coordinate measuring machines (CMMs) are instruments that can measure various geometric shapes and dimensions by detecting the surface points of workpieces through a probe system within a three-dimensional measurable space, and then using a software system (such as AC-DMIS) to calculate the measurements. The basic principle of CMMs is to accurately measure the numerical values of the points on the surface of the workpiece in the three-dimensional coordinate positions within the allowed measurement space, and then process these coordinate values through a computer to form measurement elements, such as circles, spheres, cylinders, cones, and surfaces. The shape, position tolerance, and other geometric data can be obtained by mathematical calculation.

A CMM typically consists of guidance mechanisms, measuring components, digital displays, and a worktable on which a workpiece can be placed. The probe can be moved to the measured points in a manual or automated manner, and the coordinate values of the measured points can be displayed on a digital display through a reading device and digital display unit. With this measuring equipment, the coordinate values of any point within the measuring volume can be displayed through the reading device and digital display unit. The point acquisition and transmission device of the measuring machine is the probe, which is equipped with grating rulers and reading heads along the X, Y, and Z axes. During the measurement process, when the probe contacts the workpiece and sends out a point acquisition signal, the control system collects the coordinate values of the current machine tool in relation to the machine tool origin along the three axes, and then the computer system processes the data. The use of CMMs can ensure that the accuracy of complex products meets the requirements of the drawings.

A three-coordinate measuring machine uses a guiding mechanism, measuring element, and digital display device to measure the coordinates of a point on a workpiece. The machine has a table on which the workpiece is placed, and a probe that can be manually or automatically moved to the measuring point. The measuring process is carried out by the probe, which is equipped with a grating ruler and reading head along the X, Y, and Z axes. When the probe touches the workpiece and sends a signal, the control system collects the coordinate values of the three axes relative to the machine tool’s origin. The data is then processed by the computer system to determine the coordinate values of the measured point. The measuring machine is capable of measuring points of varying sizes and can handle large workpieces as well.

3D Scanner

3D scanner involves scanning the Point Cloud on the surface of an object’s geometry to create a 3D representation of its geometric figure. This process provides information on the size of the object, tolerance analysis, feature analysis, etc. The resulting data can be used to establish CAD data for the scanned object or to build 3D data for testing the surface of parts.

n cases where 3D CAD data cannot be used, the data generated by 3D scanning can be used to build and improve product designs using real models created by rapid prototyping. The data can also be utilized in various applications, such as reverse engineering, detection and comparison, and 3D visualization.

The main purpose of 3D scanners is to accelerate the product development workflow, reduce the time and costs associated with product development, optimize production processes, and meet the quality control requirements of non-contact 3D measurement.

Project Meter

The scientific term for a two-point five-dimension imaging device is the two-point five-dimension imaging device also called project meter. This name comes from the addition of a probe to the original two-point imaging device. The device is capable of measuring various parameters such as angle, diameter, radius, point-to-line distance, the eccentricity of two circles, and two-point spacing, using the measurements of two and three. The probe used in the two-point five-dimension imaging device is typically made of materials such as ruby, silicon nitride, and zirconia, etc.

Mitutoyo Digital height micrometer

Mitutoyo Digital height micrometer is a device that is utilized to measure the height of a workpiece, its depth size, relative position, and precision marking. It operates on the vernier caliper principle and is equipped with a marking claw face on the ruler frame or gauge outfit, which measures the relative distance of movement between the working face of the base and the measuring head for accurate readings. The method of using the Mitutoyo Digital height micrometer is similar to that of the vernier caliper in terms of operation and reading techniques.