Numerical Control Processing Research Articles

Optimization of Sewing Equipment Based on Improved Genetic-ant Colony Hybrid Algorithm

The optimization of the cutting path of the sample can effectively reduce the cutting time, thereby improving the production efficiency of numerical control processing. This paper comprehensively considers the impact of the cutting order and the position of the knife entry point on the cutting path, converts the cutting path problem into a type of traveling salesman problem (TSP), and proposes an improved genetic-particle swarm optimization algorithm. The selection mechanism of the algorithm combines the elitist retention strategy and roulette wheel selection method to accelerate the search for the optimal solution; the mutation strategy designs a linear decreasing mutation rate, which enhances the global search ability; at the same time, introduces the ant colony optimization algorithm to process the fitness function, adjusts the population evolution difference, and speeds up the optimization process. Through this hybrid algorithm, the cutting order of the sample can be quickly optimized, and the nearest neighbor algorithm is used to determine the position of the knife entry point. Tests are conducted on clothing patterning charts and standard examples. Compared with several commonly used algorithms, experimental results verify the feasibility and effectiveness of this algorithm

Vibration Suppression Technology of Integrated NC Machining of Lightweight Monolithic Panel

The new generation spacecraft module is formed by spinning as a whole, and then the whole module is processed by integrated numerical control. Due to the characteristics of the large diameter and thin wall of the module, it is easy to produce vibration in the processing. In this paper, aiming at the vibration problem of integrated CNC machining cabin body, a method of using reconfigurable fixture internal support to suppress the vibration of weak rigid cabin body overall processing is proposed, and the ANSYS finite element analysis software is used to simulate and analyze the internal support force. The results show that the thickness uniformity of the bottom skin is similar, the dimensional accuracy is higher, and the effect of suppressing cutting chatter is obvious. This paper also improves the design of the milling tool with an unequal helix angle, adds DLC tool coating, and increases the tool rake angle. The simulation results of cutting force based on the FORCE module show that the cutting force is reduced by 31% and chatter in machining is suppressed compared with that before the tool is improved. Through the cycloid milling strategy, the wrap angle between the tool and the workpiece is reduced. It reduces the cutting force, reduces the cutting heat, and ensures the consistency of the product wall thickness and the roughness requirements. The experimental results show that these methods can effectively suppress the vibration in the processing and control the thickness of the integrated numerical control processing panel between 1.47-1.77 mm.

Numerical Control Simulation and Programming Based on SinuTrain Bearing Bracket (Five-axis)

At present, the development of numerical control processing technology has entered a new period and has gradually developed in the direction of artificial intelligence. Along with the development of science and technology in recent years, the present stage of our country has made a significant breakthrough in the application of numerical control processing technology. Hence, learning to master CNC machining technology is necessary. Numerical control simulation software is used to NC machining the bearing bracket (five-axis), and numerical control simulation software SinuTrain is used to NC programming the parts and simulation verification of the machining process. SinuTrain is a CNC training software that functions exactly like the controller itself. The use of this software for bearing bracket (five-axis) numerical control simulation and programming, can make us master the use of this software, and can also help us understand the mechanical processing process and programming technology.

Timber Structures and Prefabricated Concrete Composite Blocks as a Novel Development in Vertical Gardening

A modern, environmentally friendly urban lifestyle requires paying attention to landscaping and green areas. The scarcity of free land in cities and the high price of land require the combination of greenery with buildings—both vertically and horizontally. The developed green technology for construction brings together computer numerical control (CNC) processing of supporting structures and prefabricated solid planting blocks made of concrete composite. The timber structures are fixed together using traditional carpentry joints. The details, which will be manufactured in the factory using CNC processing at a controlled temperature and humidity corresponding to indoor conditions, can be easily assembled on the construction site. The high bending strength but good elasticity and connections of carpentry joints endow the structure with good properties in a non-controllable environment. By combining CNC-processed wooden structures with concrete technology as substrate composites, labor-intensive manual work in landscaping and gardening will be reduced in the future. The novel material-hardening substrate composite material uses only the residues as the raw materials.

Processing Method of Gearbox with Non-Circular Gear Train and Its Application in Rice Potted Seedling Transplanting Mechanism

A non-circular gear train has the advantages of compact structure, easy to achieve dynamic balance, and is often used to drive an end-effector to achieve complex trajectory and attitude. The gearbox is the key component of non-circular gear train, which has complex structure, and requires high precision of each wheel shaft hole and its relative position. Conventional methods often use numerical control process tools to process the gearbox with non-circular gear train. The processing cost is too high, and there are some problems, such as shaft hole deflection and it can be difficult to ensure the phase position. This research has proposed a processing method of the gearbox with non-circular gear train and developed the corresponding combination tool. Taking the gearbox of a rice potted seedling transplanting mechanism as an example, a special cutting tool with five boring tools was designed which can process five holes at one clamping, and greatly improve the efficiency and accuracy of gearbox processing. The processed gearbox and other parts were assembled into a rice potted seedling transplanting mechanism and assembled into a rice potted seedling transplanting process to conduct a seedling transplanting performance experiment. The results show that the processing of the gearbox with non-circular gear train satisfies the requirement of processing accuracy, and the transplanting mechanism can accurately complete seedling picking, transporting, planting, and other series of actions. The processing method is suitable for the large-scale manufacturing of transplanting mechanism. In this research, aiming at the double arm transplanting mechanism of high-speed rice potted seedling transplanting, the gearbox was analyzed, and a processing method of the gearbox was proposed.

Heat Transfer Analysis of 3D Printed Wax Injection Mold Used in Investment Casting.

Investment casting is one of the precise casting methods where disposable wax patterns made in wax injection molds are used to make a casting mold. The production capacity of precision foundry is determined by the time taken for producing wax patterns, which depends on the time taken for wax solidification. Wax injection molds are usually made of aluminum or copper alloys with the use of expensive and time-consuming computer numerical control (CNC) processing, which makes low-volume production unprofitable. To reduce these costs, the authors present a heat transfer analysis of a 3D printed wax injection mold. Due to the low thermal conductivity of the photopolymer resin, the influence of different cooling channels’ shapes was investigated to improve the time of the manufacturing process. Transient thermal analysis was performed using COMSOL software based on the finite element method (FEM) and included a simulation of wax injection mold cooling with cold air (−23 °C), water, and without cooling. The analysis showed that use of cooling channels in the case of photopolymer material significantly reduces the solidification time of the sample (about 10 s shorter), and that under certain conditions, it is possible to obtain better cooling than obtained with the aluminum reference wax injection mold (after approximately 25–30 s). This approach allows to reduce the production costs of low-volume castings.

Study on Mechanical Properties of Lost Foam Pattern in Machining

Lost foam casting has special requirements on the process performance of molding machinery, and the processing technology of Lost foam casting pattern is one of the core and key technologies of Lost foam casting. The research status of lost foam pattern and the safety problems existing in the process of lost foam casting were analyzed. The mechanical properties of lost foam pattern and its mechanical property model were studied, which provided theoretical support for the research of numerical control processing and safe casting of lost foam pattern. The development of Lost foam casting pattern NC processing technology is conducive to the use of information technology, digital technology to enhance the technological progress of traditional industries, promote the clean production of Lost foam casting, realize energy saving and emission reduction, and promote the rapid development of mechanical equipment manufacturing industry.

Design and realization of cutting simulation function of digital twin system of CNC machine tool

Abstract CNC machine tool processing is an important part of the current development of machinery modernization. In order to ensure the accuracy and stable quality of numerical control machining, the ecoding of numerical control program needs to be a validation to avoid in the process of the program which may leads to under-cut issue or collision case. Therefore, in the numerical control machining application process, you need to use digital twin technology to numerical control machining simulation cutting simulation, to verify the numerical control process is reasonable with the accuracy of a comprehensive, objective judgment, to avoid various abnormal situations have occurred in the process and to improve processing and production efficiency and quality.

Graphic Development Environment in Interactive Computer Interior Design

In the process of interactive design generally through the interior design graphics to achieve customer needs, interactive design is a new type of green design system, at present, has been widely used in computer web production, industrial product design, furniture manufacturing and other fields. With the continuous development of computer technology, the human-computer interaction problem is gradually reflected. In order to effectively solve this problem, we add the concept of interaction design into the field of architectural design. The interactive design is combined with the characteristics of architectural design to analyze the architectural design. In this paper, the composition, technology platform and operation mode of the interactive design system are analyzed and studied, and the residential building technology is discussed from these three aspects. In addition, it is applied to the actual case, through the use of digital design, numerical control processing simulation experiment, image experiment and other scientific research methods, the residential building space environment design experimental study. This will also lead to reference standards for green interior design of public and industrial buildings.

Research on the Innovation of NC Machining Process Based on Programming Technology

With the continuous development of China’s computer technology, China’s numerical control technology has also been widely used, concentrated in the process of processing complex parts. In the actual application of digital control technology, its operability is relatively strong, and has a strong portability and scalability, is an important part of the manufacturing in the field of integrated and automated machinery. In this paper, first of all, the numerical control processing technology and the numerical control programming technology are summarized; secondly, the complex model numerical control processing process flow is analyzed; finally its practical application is explored.

Magnetic Field Measurement, Shimming and Processing for 230 MeV Superconducting Cyclotron Main Magnet

A 230 MeV compact superconducting cyclotron CYCIAE-230 is being constructed by the China Institute of Atomic Energy, which can be used for proton therapy and space radiation physics research. The technology of magnetic field measurement, shimming and processing is the primary task to realize the isochronous acceleration of cyclotron. The CYCIAE-230 has high magnetic field, high field gradient and dense rotation orbits. Therefore, the isochronous field and tune diagram need to be amended simultaneously. The first harmonic is also shimmed at the same process to ensure a good extraction efficiency by using precessional extraction. The precision of field measurement, shimming and processing is much higher and the algorithm is much more difficult than those in normal temperature cyclotron. In addition, the compact structure of the magnet has very narrow installation space, which makes the design of the mapper more difficult. The process of main magnet construction includes strict control of room temperature and electromagnetic compatibility (EMC), precise measurement of magnetic field, comprehensive research of beam dynamics and multi-dimensional numerical control (NC) processing under the control of complex algorithms. In this paper, the magnetic field measurement, shimming and processing of the main magnet will be illustrated in detail.

Optimization of Machining Craft of Engine Block Based on Numerical Control Process Technology

This paper introduces the general and numerical control machining technology of the important surface of the engine block, and focuses on the relevant methods and measures to ensure the quality of high-speed milling and boring. Some methods and measures of optimization based on NC machining technology are proposed. The application of optimization in engine block machining cases is briefly listed. To ensure the quality of the engine block, improve its efficiency, and reduce its cost, opinions and suggestions that can be used for reference are provided.

Research on Optimization of Portrait Sculpture Data Based on 3D Image and Mobile Edge Computing

The traditional method of making portrait sculptures is hand-carving. The quality of sculpture is unstable, which mainly depends on the technical level of the sculptor. With the development of multi-coordinate numerical control processing technology and computer three-dimensional modeling technology, a new method of designing and making portrait sculptures has emerged. In order to improve the quality of sculpture and overcome the shortcomings of the existing scheme, a new optimization method for portrait sculpture data is proposed by combining mobile edge computing and 3D images. The paper first analyzes the existing portrait data collection methods based on 3D scanning and image reconstruction, and draws out the blind spots in the application of the existing data collection methods to the collection of portrait sculpture data. A method for data collection of portrait sculpture based on feature description is proposed. After determining the data optimization method, a portrait sculpture data optimization architecture is constructed through mobile edge computing technology. In order to verify the applicability of the method, the multi-angle and multi-dimensional simulation training test results show the efficiency and scalability of the realized sculpture data optimization method.

An Effective Numerical Control Machining Process Optimization Approach of Part With Complex Pockets for Numerical Control Process Reuse

Recently, various process reuse technologies have come to be widely used in manufacturing. The existing methods mainly focus on searching and reusing similar NC processes. For the optimization of process schemes generated by reusable NC machining processes, however, no effective strategy has yet been proposed, especially when it comes to complex parts with intersecting features. To address this issue, we present, here, an effective NC machining process optimization approach of the part with complex pockets for NC process reuse. This approach involves two levels, that of the machining feature and that of the part. In the former case, the cutting tool and a cutting depth of the machining region is first optimized by making full use of the tool's machining capacity and avoiding air-cutting. In the latter case, the cutting sequence of the machining regions is further optimized in the macro process so as to maintain the efficiency of the process scheme. The effectiveness of the proposed approach is verified by a jag of the electronic product and an aircraft structural in our developed prototype system based on CATIA. The presented method can be integrated into commercial CAD/CAM software for rapid NC programming.

Discussion on Reverse Design of Components with Complex Curved Surface and Computer Numerical Control Machining

Abstract: With the continuous development and advancement of science and technology, the work of tool path planning has received extensive attention. Among them, curved surface generation and data processing are the focus of management and design, which necessitate the full application of reverse design of complex curved surface components to complete numerical control processing, effective optimization and upgrading, integration the tasks of point cloud data collection and point cloud data processing to ensure that the corresponding computer numerical control machining model can exert its actual value. This paper briefly analyzes the basic principles of curved surface reconstruction as well as discusses the reverse design of complex curved components and the experimental processes and results that involved computer numerical control machining, which serves the purpose as reference only.

Application of surface translucent carving

The traditional relief by craftsmen Handmade is time-consuming and laborious with insufficient efficiency. In recent years, with the continuous development of computer aided art design and numerical control technology, the diversity and machinability of the embossing have been greatly improved. With Zbrush, Mesh Mixer and other modeling software, users can design a variety of types of relief works, and output to the numerical control processing equipment for model production.

Studies on the Melt Spinning Process of Square 8-hole Hollow Polyester Fibre

In this paper, the shape of the spinneret capillary was discussed, and optimized spinneret capillaries were successfully processed by a computer numerical control processing method which takes a C-shape silver electrode as the basic unit. Based on the optimised spinning process, a new type of square 8-hole hollow PET fibre was prepared by the experimental method.

Experimental comparison of the flow rate and cooling performance of internal cooling channels fabricated via selective laser melting and conventional drilling process

Injection molds with conformal cooling channels have been deemed increasingly important in the mold manufacturing industry. Selective laser melting (SLM) has proven to be an effective process to fabricate conformal cooling molds. However, the surface quality and morphologies of SLM-fabricated cooling channels are different from that of conventional drilled channels. To investigate the differences in the coolant flow rate and cooling performance between SLM-fabricated and drilled cooling channels, test molds with cooling channel diameters of φ2 mm, φ3 mm, and φ4 mm were fabricated via SLM and the computer numerical control (CNC) process. A test system was designed and set up to investigate the flow rate and cooling performance of two types of test molds. The geometrical shape, dimensional accuracy, and surface morphologies of the SLM-fabricated cooling channels were characterized using optical microscopy and laser microscopy. The results indicated that the SLM-fabricated cooling channel exhibited an elliptic shape due to the lack of support along the building direction. The flow rate of the SLM-fabricated cooling channels was smaller than that of the drilled channels due to the low dimensional accuracy and roughness surface. The cooling performance of the SLM-fabricated cooling channels was also poorer than that of the drilled channels due to the presence of unmolten particles and a loose layer on the SLM-fabricated surface. Theoretical analysis was conducted on the influence of surface roughness on the flow rate and cooling performance of two types of channels and the friction factor; Nusselt number and heat transfer coefficient were obtained.

Between Designer and Design: Parametric Design and Prototyping Considerations on Gaudí’s Sagrada Familia

Digital technologies have enabled new design methods, casting a reassessment of current theories of design. Rivka Oxman proposed five paradigmatic classes of digital design models according to the various relationships between the designer, conceptual content, applied design processes, and the design object. Kotnik states that catenary curve computational thinking is changing the way we think and design in architecture; it can be distinguished by three main levels of “computability”: representational, parametric and algorithmic. Kolarevic clarifies that new digital approaches to design (based on computational concepts), construction and prototyping can be achieved by computerised numerical control process (CNC). The study aims to promote the integration of theory and practice in search of a feedback loop that promotes the scientific method of knowledge production. The theoretical work intends to develop an updated understanding of the use of digital technologies. The practical experimentation analyses the Sagrada Família, designed by Antoni Gaudí, and proposes to compare digital (through the software Rhinoceros and the plug-in Grasshopper) and handmade physical models from the concept of catenary used by the Catalan architect. Referring to the Sagrada Família, Burry believes that “the continued contribution of the craftsperson is judged as a crucial partner to the digital dialogue” (Burry, 2005)

A 3D PRINTING PRACTICE FOR PREOPERATIVE REHEARSAL BASED ON THE ADDITIVE AND SUBTRACTIVE MANUFACTURING

Preoperative rehearsal is very important before the operation, because of its particularity and difficulty, traditional printing can hardly achieve it, and thus a new kind of fixture for the 3D printing of pelvis model is critical. Fixture design in manufacturing system is very important and directly affects the processing quality, production efficiency and manufacturing costs. As a new method of manufacturing, the alternative style of additive and subtractive manufacturing is potential in market prospect. New requirements on the performance and structure of the fixture were put forward due to the high complexity of product surface in alternative manufacturing, as well as the force characteristics of numerical control (NC) processing. In this paper, we propose a novel type of fixture which is capable of completing printing tasks in preoperative rehearsal. An experiment is performed to validate the rationality and universality of the fixture. A 3D printing practical case of pelvis model before pelvic correction surgery is used to demonstrate the effectiveness of the present fixture.