MindMap Gallery Mechanical-Interchangeability and Technical Measurement Chapter 3 Mind Map
A mind map on Chapter 3 of Mechanical Interchangeability and Technical Measurement, including shape tolerance, direction, position and runout tolerance, tolerance principles, etc.
Edited at 2023-12-05 01:00:50One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
Project management is the process of applying specialized knowledge, skills, tools, and methods to project activities so that the project can achieve or exceed the set needs and expectations within the constraints of limited resources. This diagram provides a comprehensive overview of the 8 components of the project management process and can be used as a generic template for direct application.
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
Project management is the process of applying specialized knowledge, skills, tools, and methods to project activities so that the project can achieve or exceed the set needs and expectations within the constraints of limited resources. This diagram provides a comprehensive overview of the 8 components of the project management process and can be used as a generic template for direct application.
Chapter 3 Geometric Tolerance Testing
Overview
The occurrence and impact of geometric errors
Affects the functional requirements of the part
Affects the fit properties of parts
Affects the assembleability of parts
Geometric elements and classification of parts
Divided according to geometric structure characteristics
Component elements (outline elements)
Export features (center features)
Divided by state of existence
ideal elements
actual elements
Divided according to position in geometric tolerances
Measured elements
datum features
Divided by functional relationship
single element
associated elements
Characteristic items and symbols for geometric tolerances
Shape tolerance: straightness, flatness, roundness, cylindricity, line profile, surface profile
Direction tolerance: parallelism, perpendicularity, inclination, line profile, surface profile
Position tolerance: position, concentricity (for center point), coaxiality (for axis), symmetry, line profile, surface profile
Runout tolerance: circular runout, total runout
Shape tolerance
Form Tolerances and Tolerance Zones
Shape tolerance is used to limit the shape error of the part itself
Measured elements of form tolerance: shape, orientation, position and size
Characteristics of the tolerance zone: no datum, direction and position are floating
Assessment principles for shape errors
It means that the maximum change of the measured element relative to the ideal element is the smallest
Orientation, position and runout tolerances
Benchmarks and classifications
single benchmark
portfolio benchmark
benchmark system
Directional tolerance and tolerance zone
Directional tolerance refers to the total amount of variation allowed in the direction of the associated elements relative to the datum.
The directional tolerance zone has a certain direction relative to the datum, and has the function of comprehensively controlling the direction error and shape error of the measured element.
Position tolerance and tolerance zone
Position tolerance refers to the total amount of variation allowed in the position of the associated elements relative to the datum.
The position tolerance zone has a definite position relative to the datum and has the function of comprehensively controlling the position, direction and shape of the measured element.
Runout tolerance and tolerance zone
Circular runout tolerance
Measured elements: cylindrical surface, conical surface and end surface
Datum elements: axis
Definition: The measured element rotates one circle relative to the datum element, while the probe does not move relative to the datum. The difference between the maximum and minimum values of the obtained indication table is the maximum variation.
Full runout tolerance
Measured elements: cylindrical surface and end surface
Datum elements: axis
Definition: The measured element rotates multiple times relative to the datum element, and at the same time the probe moves relative to the datum. The difference between the maximum and minimum values of the indicator table obtained is the maximum variation.
Tolerance principle
Commonly used terms related to tolerance principles
Extract local dimensions of component features
The effect size of a single element
In vitro action size
In vivo action size
The effect size of associated features
Maximum entity status and maximum entity size
Minimum entity size for minimum entity state
Minimum entity effect state and minimum entity effect size
ideal boundary
Tolerance principle
principle of independence
related requirements
Inclusion requirements
Maximum entity requirements
Geometric tolerance standards and regulations for unspecified geometric tolerance values
Geometric Tolerance Standards
Tolerance value
No tolerance value noted
No geometric tolerance value specified
Straightness, flatness, perpendicularity, symmetry and circular runout are determined by specified unspecified tolerance values.
Tolerance levels: H, K, L, decreasing in order
Selection of geometric tolerances
Selection of geometric tolerance items
Purpose of selection: to ensure the functional requirements of the machine or instrument, improve product quality, and reduce manufacturing costs
Consider the geometric characteristics of the part, the functional requirements of the part, the control function of the geometric tolerance, and the convenience and economy of detection.
Selection of tolerance principles
principle of independence
related requirements
Selection of geometric tolerance values
On the premise of meeting the functional requirements of the part, use a lower tolerance level as much as possible
Selection of datum features
Selection of base parts
Choice of base quantity
Base order arrangement
Annotation of geometric tolerances
tolerance grid
Labeling of measured elements
Labeling of datum features
Marking of theoretically correct dimensions
Detection of geometric errors
Detection principles of geometric errors
Compare with theoretical elements
Principles of measuring coordinate values
Principles of measuring characteristic parameters
Measurement runout principles
Inspection equipment: inspection flat plate, knife edge ruler (knife edge ruler), frame level, plug gauge, deflection meter, wide base square, V-shaped iron
Geometric error detection methods: 1. Straight line error detection (gap method, indicator needle method) 2. Flatness error detection (interference method, indicator needle method) 3. Roundness error detection (two-point method measurement, three-point method measurement ) 4. Parallelism detection (face-to-face parallelism error detection, line-to-line parallelism error detection) 5. Verticality error measurement (face-to-face verticality error detection, face-to-line verticality error detection) 6. Coaxiality Degree error detection (detection of axis-to-axis coaxiality error, detection of hole-to-hole coaxiality error) 7. Symmetry error detection (face-to-face symmetry error detection, face-to-line symmetry error measurement) 8. Circle Detection of runout and total runout (radial circular runout detection, axial circular runout detection, radial full runout detection)