ISO 9001:2015 Quality

At ANXIN, quality is at the core of everything we do. We are proud to be ISO 9001:2015 certified, demonstrating our dedication to excellence in custom, low-volume additive and traditional design and manufacturing of metal and plastic components and assemblies.

Our Commitment to QualityOur ISO 9001:2015 certification ensures that our quality management system meets internationally recognized standards. This certification reflects our commitment to:

Inspection Equipment

Principles and Working Modes

1.Calipers, Micrometers and Dial Indicators: Basic Manual Measuring Tools

The essence of these three tools is to amplify and read minute length displacements through precise mechanical structures

· Caliper:

· Principle: Based on the cursor principle or the dial/digital display principle.

· Vernier caliper: The precise fit between the main scale (with a graduation value of 1mm) and the auxiliary scale (vernier). The total length of n divisions on the cursor is equal to the length of (n-1) divisions on the main scale. During measurement, by observing which line of the main scale aligns with the vernier scale, and using the slight difference to read the decimal part below millimeters (such as 0.02mm, 0.05mm), mechanical subdivision is achieved.

· Digital caliper: The core is the capacitive grating sensor. There is a series of evenly spaced metal gates on the ruler body, which form capacitive coupling with the gates on the vernier slide scale. When sliding, the capacitance value changes periodically. By processing these signals through the circuit, the displacement is calculated and displayed in digital form.

· Working mode: It directly contacts the workpiece to be measured through the inner measuring claw, outer measuring claw or depth rod for comparison measurement.

· Micrometer

· Principle: Based on the helical amplification principle of precision threads.

The core component is a high-precision screw (micrometer screw) with a pitch of 0.5mm. The circumference of the differential cylinder connected to the screw is uniformly engraved with 50 divisions. When the differential cylinder rotates one full circle, the screw moves axially by one pitch (0.5mm). Therefore, for each division (1/50 turn) that the differential cylinder rotates, the screw moves by 0.5mm /50 = 0.01mm. This tiny displacement, which can be estimated to 0.001mm, is magnified into a distinct circular motion on the differential cylinder through the helical motion of the screw, facilitating observation.

· Working mode: Place the workpiece between the fixed anvil seat and the measuring surface of the micrometer screw, rotate the force measuring device (ratchet) until a constant measuring force is reached, and then read the value.

Inspection Equipment

· Dial indicator/micrometer:

· Principle: An amplification mechanism based on rack and pinion or lever gears.

The linear displacement (slight movement) of the measuring rod drives the internal rack to move, and the rack drives a series of precise pinions to rotate. Through multi-stage gear transmission, the tiny linear displacement of the measuring rod is amplified as a large-angle rotation of the pointer on the dial. The dial is evenly divided into 100 divisions (dial indicator) or more divisions (dial indicator). For instance, if the measuring rod moves 1mm and the pointer rotates one full circle (100 divisions), then each division represents 0.01mm.

· Working mode: It is usually installed on the gauge frame, with the measuring head touching the surface to be measured vertically (or at a certain Angle through the lever gauge head). Through comparative measurement, the dimensional deviation (such as the difference from the standard block), shape error (such as roundness) or position error (such as runout) of the workpiece can be detected.

2. Image Measuring Instrument (VMI)

The core principle of the image measuring instrument is non-contact measurement based on optical imaging and digital image processing technology.

· Working principle and process:

1. Optical imaging: The workpiece to be tested is placed on a glass workbench, with either a contour light source (surface light) below or a coaxial light source (used for the inner wall of the hole) above illuminating the workpiece. Clear two-dimensional contour images of the workpiece are obtained through high-resolution industrial cameras and telecentric lenses (key components that can eliminate perspective errors and ensure that the measured dimensions are independent of the object’s position).

2. Image acquisition and processing: Image signals are transmitted to the computer, and software digitizes and processes the images (such as noise reduction, sharpening, and edge enhancement).

3. Edge extraction: This is the most crucial step. The software automatically identifies and locates the pixel edges of the workpiece contour from bright to dark (or from dark to bright) through algorithms (such as the grayscale gradient method). The operator can also manually select edge points.

· Core concept: Through the calibration of the telecentric lens, it is known that each pixel represents the physical size in the actual space (for example, 1 pixel = 0.001mm).

3. Coordinate Measuring Machine(CMM)

The Coordinate Measuring Machine(CMM) is a high-precision three-dimensional geometric measurement system integrating precision machinery, three-dimensional probes, motion control and computer software. The principle can be summarized as precise detection and spatial coordinate positioning.

· Core Components and Working Principle:

1. Mechanical motion system: The CMM has a bridge or boom structure that can freely move in three-dimensional space and precisely move on three mutually perpendicular guide rails, X, Y, and Z. The movement amount is fed back in real time by the grating ruler (a high-precision length sensor engraved with nanoscale lines and read based on the principle of light interference), thereby accurately determining the spatial position of the probe center in the machine coordinate system.

2. Probe system (core sensor) : The probe installed at the end of the Z-axis is responsible for "sensing" the workpiece.

· Triggered probe: (Commonly used) When the probe touches the workpiece, the internal mechanism triggers a switch signal. The machine immediately reads the coordinate values of the three-axis grating rulers at this moment and records them as the three-dimensional coordinates (X, Y, Z) of a point. Point-by-point detection.

· Scanning probe: (High precision) It can continuously and in real time feedback the tiny deflection of the probe when in contact with the workpiece. Combined with the machine coordinates, it can collect continuous point cloud data on the workpiece surface at high speed and high density.

3. Data processing System (Software) :

· Coordinate system establishment: Firstly, by measuring the features on the workpiece (such as planes, circles, cylinders), a workpiece coordinate system consistent with the design reference of the workpiece is established in the software.

· Element fitting: The three-dimensional coordinates of a series of discrete points measured are used to fit geometric elements (planes, lines, circles, spheres, cylinders, cones, etc.) using mathematical methods (such as the least square method).

· Shape, position and size calculation: The software calculates the shape errors (such as flatness, roundness, cylindricity), position errors (such as parallelism, perpendicularity, coaxiality, positional accuracy) and dimensions (such as hole center distance, diameter, Angle) based on these fitted "ideal" elements. All calculations are carried out in three-dimensional space.

· Core advantage: It can uniformly transform complex spatial geometric shapes and positional relationships into quantifiable three-dimensional coordinate data for mathematical processing, thereby achieving the measuability of any geometric parameter. It is the ultimate inspection tool for dimensional, shape and positional tolerances.