Research and application of fastener tools

Research and Application of Mechanical Industry Standardization and Quality Fastener Tools China Machine Productivity Promotion Center â–¡ Pan Kanghua China Petroleum Group Jichai Power Plant â–¡ Lu Jiangfeng firmware tool design ideas. Taking the 3D CAD software Pro/E as the object, the fast assembly technology and method of fasteners based on enterprise standard parts library were studied, and the key technologies of rapid selection, group assembly and automatic opening were analyzed, and developed by Pro/TOOLKIT. A set of fastener tools for fast design of fasteners in Pro/E environments.

The function of the fastener is to fasten and connect the mechanical parts. Its application is extremely wide. It is characterized by various specifications and different performances, and the product is standardized and serialized. At present, most companies have created standard parts libraries (including fasteners, but still use manual assembly methods when assembling. This traditional assembly method has the following drawbacks: (1) fasteners are stored locally or In the specified location of the server, the user selects according to the needs when using. For the complicated situation of the standard parts library, it is necessary to search step by step, and the selection is difficult; the fasteners are not assembled in groups, and need to be assembled one by one, and every two zeros To achieve complete assembly between components, at least two constraint relationships need to be defined, which is cumbersome and inefficient. When the fasteners that have been assembled are modified or deleted, they need to be operated one by one, which is inefficient and does not conform to design habits; The fastener opening is generally first punched and then assembled with fasteners. The fastener specifications are not related to the screw hole size. The design cannot be updated simultaneously when the design changes. The combination and matching method of the fasteners need to be inquired about relevant standards or mechanical design manuals. It is not convenient for the accumulation and transmission of fastener knowledge commonly used by enterprises.

In this paper, the 3D CAD software Pro/E is taken as the object, and some researches on the fast automatic assembly technology of fasteners are carried out, and the implementation method is given.

The fastener tool is custom developed for the enterprise, and the basic data comes from the enterprise standard parts library. The main function is to meet the needs of enterprise customers in the fastener design process, to easily find and call enterprise standard parts, and to support the grouping, batch assembly, modification and deletion of fasteners, thereby saving time and improving design efficiency. The specific requirements are as follows: The system belongs to the secondary development tool, and should adopt advanced software architecture to ensure stable, reliable, scalable and easy maintenance and upgrade of the system performance; the system should be seamlessly integrated with the 3D CAD design software and does not affect the 3D CAD. Use of design software. In addition, if the company's standard parts inventory is stored in the PDM system, the tool must also be integrated with the PDM system to read the fastener information under the specified path; in order to facilitate the management of the fasteners, the enterprise standard must first be The parts library is combed, and the commonly used fastener specifications, matching methods, combination methods, etc. are provided; a visualized and integrated program interface is provided, and different options can be displayed in the interface in real time, and the assembly effect can be visually expressed; automatic recording Last operation information, easy to repeat.

Quick selection is to quickly select the required fasteners from the specified standard parts library. The basic idea is to use the program to automatically read the information of the standard parts library under the specified path, and pass the standard number, specification, and Performance parameters, surface treatment, material coding and other attribute parameters are filtered and queried, and the program automatically obtains matching fastener models according to the selected fastener information.

This wizard-based selection method not only allows quick selection of the required fasteners, but also effectively manages and effectively controls the fastener specifications commonly used by enterprises.

In addition, in order to enhance the automation of the selection of attribute parameters in the assembly process, this paper also studies the automatic matching of the parameters of bolts, nuts, washers, etc., that is, when the user selects the nominal diameter of a bolt, according to the accuracy level of the opening and Differently, the system automatically filters out the parameters of the nuts, washers, etc. matching the nominal diameter of the selected bolts in the standard parts library information table read, so as to realize the rapid selection and update of the matching fastener groups.

The realization of group assembly is one of the key technologies of fastener tools. The core idea is to define the matching fasteners into groups in the assembly model.

Generally, according to the type of the main drive, the fastener group can be divided into three types: bolt, screw and nut, and different combinations can be defined according to the main drive. For example, some combinations need to be equipped with a spring pad and a flat pad, and some combinations have a spring pad and a flat pad, and some combinations have a thin nut at the end. The combination mode can also be edited as needed, and can be added to the list after editing, which is convenient for repeated operations.

In order to facilitate the designer to view, the graphical preview is used to render the selected fasteners according to the selection (the unselected fasteners are displayed in reverse), which can visually express the effect of the assembly, as shown.

In addition, in order to improve the efficiency of the assembly, the software also studied the bulk assembly, fast U-turn and batch delete functions.

1) Batch assembly function: In an assembly, it is often necessary to assemble multiple times for fastener sets of the same specification and the same fit. The program automatically places the fastener sets in batches by finding the same hole features.

Combination mode 1 0 bolt 0 upper flat pad 1 upper elastic pad 0 lower elastic pad 0 lower flat pad 0 nut 0 "thin nut added to list fastener combination mode mechanical industry standardization and quality step on 6S inch W" inch 2> fast U-turn function : The selected fastener set is rotated 180. as a whole, and the (mating side) of the fastener sets at both ends (the bolt side and the nut side) are exchanged, thereby realizing the change of the fastener group installation direction.

3) Batch delete function: For the unneeded fastener groups that have been assembled, a dialog box will pop up automatically when deleting, prompting the user to delete the same batch of fastener groups, and performing the same batch of fastener group features. Highlight as shown.

Automatic opening technology is one of the difficulties in the realization of fastener tools. In the traditional assembly method, the fasteners are generally pre-opened and then assembled, and the hole features are often built on the part level, so that there is no correlation between the hole features and the fasteners, and the design changes cannot be synchronized and updated manually, and need to be manually modified one by one. The operation is very cumbersome.

First, the program acquires the position of the hole by two interactive operations by the user, one is to select the position of the reference point or the reference axis, and the other is to select both ends of the fastener set.

Then, through the interface setting hole specifications and accuracy (generally including coarse, medium, fine three) control hole size, as shown, select "opening data" opening data hole point axis selection aperture bolt side nut side automatic opening High vacuum pneumatic flapper valve cylinder and piston rod diameter selection Shenyang Ruifeng Technology Co., Ltd. â–¡ Huang Bozhen determination method for the selection of high vacuum flapper valve cylinder and piston rod diameter.

A vacuum valve is a component of a vacuum system that regulates air flow, shuts off or turns on a line. The high vacuum flapper valve is powered by compressed air, and the direction of the gas path is changed by the electromagnetic reversing valve to perform the cylinder drive flapper valve opening and closing movement, which is suitable for opening or blocking the airflow in the 1.3x14Pa~1.0x105Pa vacuum system. The flapper valve has the advantages of simple structure, short opening and closing time, safety and reliability, durability, and automatic control. It is widely used in electronics, chemical, metallurgy, aviation, aerospace, materials, biomedicine, atomic energy, and space exploration. Science and technology field. The cylinder diameter and piston rod diameter design of the high vacuum pneumatic flapper valve are very important. When the flapper valve is opened and closed, if the cylinder and piston rod diameter are not designed properly, the valve may not open, and the opening and closing time is long. This article describes how to estimate the diameter of the cylinder and piston rod at a given pressure to provide this solution.

1 Check the sealing surface of the damper valve cover to calculate the specific pressure. This article uses an atmospheric pressure, nominal diameter DN160 high vacuum pneumatic flapper valve as an example to calculate, see Table 1. Mechanical industry standardization and quality In addition, the fastener group will The hole feature information is automatically recorded, and when the position of the fastener group is moved, the hole feature size matched with the hole can be automatically modified by an update program.

Reasonable selection of secondary development tools and languages ​​is the key to program portability. Pro/TOOLKIT from PTC for Pro/E is a powerful secondary development tool for Pro/E. It encapsulates many library functions and header files for Pro/E underlying resource calls. It can be used with third-party compilation environment (C Language, VC++ language, etc.) for debugging. Pro/TOOLKIT provides a seamless connection to Pro/E for user programs, software and third-party programs.

A number that enables external applications to access Pro/E databases and applications securely and efficiently. Through the seamless integration of C programming and applications with Pro/E, users and third parties can add the required functionality to the Pro/E system. Therefore, the fastener tool software is developed in combination using VC++ and Pro/TOOLKIT.

According to the idea of ​​group assembly, using Microsoft Visual C++ for programming, a fastener tool conforming to the assembly habit has been developed on the 3D CAD software Pro/E platform, which realizes rapid selection of fasteners, group assembly and intelligent punching. And other functions, and applied in the design of fasteners. Practice has proved that the tool has a significant effect on improving the efficiency of fastener design, and it is convenient for the accumulation and transmission of fastener knowledge commonly used by enterprises.

Miniature Parallel Valve

Miniature Parallel Valve is one kind of solenoid air valve with 1 inlet and several outlets. it can be customized to Normally Open Air Valve or Normally Closed Air Valve.