In this paper, a stencil printer is designed. Its linear displacement positioning accuracy is 0.65438±0mm, the maximum forward and backward speed VMAX = 65438 0.5 m/min, and the maximum stroke is 400cm. It can be widely used in various PCB solder paste printing occasions.
The design of this paper is mainly the overall design of the whole machine, which can be subdivided into scraper assembly design, conveying guide rail design, substrate positioning and clamping design and substrate support lifting table design. The design of scraper mainly lies in the transmission type and scraper type used for scraper head movement and scraper lifting. The design of conveying guide rail is mainly adjustable in width, which can meet the conveying of a series of PCB boards. The positioning and clamping design of the substrate mainly designs the positioning mode of PCB, and the design of the lifting platform lies in the way of supporting the substrate. In the design of scraper assembly, the movement of scraper assembly adopts the meshing mode of spur gear and rack, which realizes the smooth and uniform reciprocating speed of scraper assembly. The scraper lifting design adopts ball screw transmission, which ensures the positioning accuracy of linear displacement and the scraper pressure can be adjusted according to the height. In the design of substrate positioning and clamping, this paper adopts the way of top surface clamping; In the design of lifting platform supported by base plate, four locking cylinders are used to drive the lifting platform, which can prevent unexpected events and ensure the safety of the project.
With the help of detecting electricity, the design can become a real electromechanical product and is suitable for a series of PCB solder paste printing. The design task meets the requirements of the task book.
Key words: surface assembly technology; Printing machine; Base plate; Scraper; Because of the important role of printing technology in electronic product manufacturing, its application can not only improve the efficiency of printed circuits, but also reduce costs and improve product quality. The development and application of new devices inevitably have an impact on solder printing technology. Therefore, China must strengthen the research and development of this project in order to obtain further development. Therefore, the design of SMT screen printing machine is of great significance in industrial production. In this paper, a stencil machine is designed. Its linear displacement accuracy is 0.65438 0 mm, the maximum reciprocating speed Vmax = 65438±0.5 m/min, and the maximum distance is 400 cm. It can be used for all kinds of PCB solder printing. This paper mainly studies the design of the whole machine, including the design of scraper module, track, PCB positioning fixture and board-supported lifting platform. The design of scraper is a transmission and stencil printing type designed to make the scraper head move and stencil printing rise. The design of the track is a transmission device, and the width can be adjusted to meet a series of PBC needs. Designing PCB positioning fixture is a method to position PCB. The lifting table is a way designed for board support. For the scraper module, its motion adopts the form of spur gear meshing and rubber rack to achieve the purpose of smooth reciprocating motion. The transmission of scraper lifting design adopts ball screw transmission mode to ensure the accuracy of linear displacement, and the scraper pressure can be adjusted by height. The design of PCB positioning fixture and the processing method of top fixture are introduced. The formwork support lifting platform is driven by four locking cylinders, which ensures the emergency will not happen and the safety of the project. With the detection of electricity, this design may become a real electromechanical product, and is suitable for a series of PCB solder printing. Naturally, this design task can meet the requirements. Keywords: SMT stencil printer; Directory introduction of PCB rubber broom 1
1 Introduction 2
1. 1 project background 2
1.2 overview of SMT press 3
2 Scheme design
2. 1 Scheme design option 4
2.2 Overall composition of equipment 5
2.3 Functional Description of Components 5
3 Design Basis of Machine 6
3. 1 Scheme 6 Basic knowledge of mechanical design
3. 1. 1 The general transmission form should follow the following principle 6.
3. 1.2 slide rail design 7
3. 1.3 Overview of Stepper Motor 9
3. Overview of1.4 Ball Screw Pair 10
3. 1.5 cylinder overview 13
4 Scheme design analysis 20
4. 1 Detailed design of machine parts 20
4. 1. 1 Design process of scraper assembly 20
4. 1.2 Design process of conveying guide rail and substrate supporting workbench 22
4. 1.3 Design of clamping assembly for formwork 25
4. 1.4 linkage process of all components 26
4.2 Selection and inspection of stepper motor and screw of scraper assembly 27
4.2.2 According to the accuracy requirements, verify the minimum allowable thread bottom diameter d2m 30 of the ball screw.
4.2.3 Determine the preload of the ball screw pair 32.
4.2.4 Parameter Selection of Ball Screw 32
4.2.5 Thread raceway radius R 32
4.2.6 Calculation of the Length of Ball Screw 32
4.2.7 Analysis and Selection of Locking Cylinder 34
5 abstract 37
thank you
Reference 39 Economical numerical control transformation of common CA6 140 lathe mechatronics includes foreign languages, manuals and electrical drawings. The number of words in the assembly drawing is 14549, with 35 pages. Paper number: JX090 Overview 1. A brief history of numerical control system development 1946 gave birth to the world's first electronic computer, which shows that human beings have created mental work that can be enhanced and partially replaced. Compared with those tools created by human beings in agriculture and industrial society that only enhance physical labor, it has made a qualitative leap and laid the foundation for human beings to enter the information society. Six years later 1952, computer technology was applied to machine tools, and the first CNC machine tool was born in the United States. Since then, the traditional machine tool has undergone a qualitative change. In the past half century, CNC system has experienced two stages and six generations of development. Second, the analysis of the status quo of domestic CNC machine tools (I) The status quo of domestic CNC machine tools In recent years, the share of CNC machine tools in Chinese enterprises has increased year by year, and it has been widely used in large and medium-sized enterprises, small and medium-sized enterprises and even individual enterprises. In these CNC machine tools, except for a few integrated machine tools with FMS mode, most of them are in the state of single machine operation, and quite a few of them are in the state of low efficiency and backward management mode. In 20001year, the output value of China machine tool industry has entered the fifth place in the world, and the consumption of machine tools has risen to the third place in the world, reaching US$ 4.739 billion, second only to US$ 5.367 billion, an increase of 25% over the previous year. However, because domestic CNC machine tools can't meet the market demand, the import of machine tools in China is increasing year by year. 200 1, imported machine tools ranked second in the world, reaching $2.406 billion, an increase of 27.3% over the previous year. In recent years, China's export volume has increased greatly, including CNC lathes, CNC grinders, CNC special processing machines, CNC shearing machines, CNC forming benders, CNC die casting machines and so on. Common machine tools include drilling machine, sawing machine, slotting machine, broaching machine, combined machine tool, hydraulic machine, woodworking machine tool, etc. The varieties of CNC machine tools exported are mainly middle and low grade. (2) Features of domestic CNC machine tools 1, major breakthroughs have been made in new product development, and high-tech products are dominant. 2. The output of CNC machine tools has increased substantially, and the numerical control rate has increased significantly. In 200 1 year, the domestic output of CNC metal cutting machine tools has reached180,000 sets, an increase of 28.5% over the previous year. The numerical control rate of output value of metal cutting machine tool industry increased from 17.4% in 2000 to 22.7% in 2006. 3. Breakthroughs have been made in key supporting products for the development of CNC machine tools. Third, the development trend of numerical control system 1. Continue to develop the catalogue in the direction of the open and PC-based sixth generation.
chapter one
Preface 1.
introduction
Abstract 7
design requirements
2. 1 overall scheme design requirements
2.2 Design parameters
2.3. Other requirements ........................................... 12
Chapter III Design and Calculation of Mechanical Part of Feed Servo System
3. 1 Design of mechanical structure transformation of feed system
3.2 Calculation and Selection of Mechanical Part of Feed Servo System 13
Chapter IV Calculation and Selection of Stepping Motor
4. 1 Basic principles for selecting stepping motors
4.2 Selection of Stepping Motor
The fifth chapter spindle AC servo motor
5. 1 spindle speed range
5.2 Primary Selection of Spindle Motor Model
5.3 Calibration of Spindle Motor
Chapter VI Hardware Circuit Design of Microcomputer Control System
6. 1 Functional requirements of control system
6.2 Hardware Circuit Composition
6.3 Design Description
Chapter VII Structural Features of Lathe Transformation
Chapter 8 Problems needing attention in installation and adjustment 3 1
References -32
abstract
The main reducer is the main component in the automobile transmission system to reduce the speed and increase the torque, and its performance directly affects the quality of the whole vehicle. By testing the main reducer in all directions on the production line, the product quality can be effectively guaranteed. This paper introduces the mechanical structure design and electrical system design of the automobile main reducer test-bed. The system can detect the comprehensive performance of three main reducers and judge the product performance according to the preset technical parameters. The design of mechanical part includes the design of test-bed base, transmission system and fixture system. The base can support and position the whole test bench and motor. The transmission system realizes the transmission of motor output power and connects the torque and speed sensors to the whole system. The fixture system realizes the positioning and clamping of the main reducer and ensures that the input shaft of the main reducer can form a stable connection with the transmission system.
Keywords: main reducer; Test bench; Abstract: Mechanical structure design: The main reducer is the main component of automobile transmission to reduce speed and increase torque, and its performance has a direct impact on the quality of the whole vehicle. It can effectively ensure the product quality by carrying out all-round inspection on the production line through the main reducer experimental system. This paper introduces the mechanical design and electrical system design. The system can check the comprehensive performance of three types of main reducers and evaluate the production performance according to the predetermined technical parameters. The machine part includes platform system, transmission system and fixture system. The platform system can support and position the motor. The transmission system can transmit power and connect the torque tachometer to the whole system. The fixture system can realize the positioning and clamping of the main reducer and ensure the stable connection between the input shaft of the main reducer and the transmission system.
Keywords: main reducer; Experimental system; Catalogue of mechanical structure design
Chinese abstract 1
Abstract 2
1 Introduction 3
1. 1 Brief Introduction of Final Drive 3
1.2 technical significance and development status of final drive testing at home and abroad 4
2. Overall scheme of main reducer test bench 5
2. 1 working environment and requirements of final drive 5
3 overall design idea and scheme 7
3. 1 Basic Parts Design 8
3.2 Transmission System Design 8
3.2. 1 motor selection 9
3.2.2 Selection of drive belt 1 1
3.2.3 The coupling is selected as 1 1.
3.2.4 Sensor selection 13
3.2.5 bearing inspection 13
3.2.6 gear parameters 18
3.2.7 Selection of Transmission Flange 19
3.3 Fixture Positioning System 22
3.3. 1 cylinder selection 22
4 Electrical control system 24
4. 1 Composition of Industrial Control Computer 25
4.2 System Control Module 29
5 detection principles and steps, 29
5. 1 detection principle 29
5.2 Detection Step 30
Conclusion of intransitive verbs 3 1
Thank you 3 1
Reference 32 The above answers come from:/