Scheme Design of Machine Tool Floating Spindle Based on TRIZ Theory

The integration of TRIZ theory and computer-aided innovation has become a research hotspot of current technology and product innovation. The article applies the TRIZ technical contradiction solving matrix to the common glass processing methods and their existing problems. In combination with TechOptimizer software, the glass spindle machine floating spindle system is creatively designed, which better solves the problem that the spindle must rotate at high speed and must be adaptive. technical challenge. The research results show that the application of TRIZ theory and TechOptimizer technology innovation software can effectively solve the technical problems in technological innovation and product innovation.

introduction

TRIZ is a former Soviet academia expert known as TRIZ GenrichS. Founded by Altshuller. Its purpose is to study the scientific principles, methods and laws that humans follow in the process of inventing and solving technical problems. With this in mind, people can dynamically develop product designs and predict future trends.

The main task of product innovation is to continuously resolve the contradiction between outdated products and market demand. The reason why products cannot meet market demand is because there are contradictions within them that hinder the renewal. In TRIZ theory, such contradictions are called technical contradictions. The so-called technical contradiction refers to the phenomenon that when some parts or parameters of the system are improved by known principles and methods, it is inevitable that other parts of the system or parameters will deteriorate. For example: quality and strength, car speed and fuel consumption, etc. The principles provided by the technical contradiction resolution matrix often do not directly solve the problem, but provide the exploration direction that is most likely to solve the problem. When solving a problem, you must also propose a specific method to solve the problem based on the principle provided and the specific conditions for the problem to be solved.

1.TechOptimizer Technology Innovation Software

TechOptimizer software is based on TRIZ and combines creative design methods to assist engineers, researchers and business operators in product improvement, new product development and computer-aided innovation software with breakthrough innovations. It can help technicians in different engineering fields to correctly identify and quickly solve key problems in product development according to market demand in the conceptual design stage of products, and propose feasible and innovative design solutions with high quality and high efficiency, leading the design to the right direction. . The software was developed by the US company InventionMachine and is a knowledge-based innovation tool.

TechOptimizer software consists of functional modules such as product analysis, process analysis, feature transfer, scientific principles retrieval, innovation principles, prediction, and network assistants. Its main features are: can quickly find problems in existing products or processes according to user needs, and give high-quality solutions; help designers solve technical contradictions, avoid compromise design; accelerate new product and process development process; Cost analysis at the conceptual design stage to effectively reduce product costs; expand the user's knowledge area; intelligent wizards give operational prompts at any time, software is easier to use; and automatically generate analysis reports.

2. Innovative design of floating spindle for glass processing machine

2.1 Common glass processing methods and their problems

The edging of the flat glass, the edge of the glass is processed into a certain shape, such as a straight edge, a rounded edge or a C-shaped edge, etc., usually using a production line that can be completed in a one-time operation. Rough grinding, semi-finishing, fine grinding, polishing, etc. of the glass are continuously performed by diamond grinding wheels installed in up to six stations. For the decorative grinding of glass craft products and crystal glass, it is often used for decorative processing manually or on a multi-axis automatic special grinding machine. The rough grinding of the optical lens generally uses a cup-shaped grinding wheel with a circular arc on a special grinding machine. At present, since the machine tool spindle is not capable of self-adjusting the change of the external force of the tool when machining the glass, the glass product and the tool are easily broken.

2.2 Application Technology Contradiction Resolution Matrix proposes innovative solutions

When the glass is being ground, the grinding wheel spindle must rotate at a high speed. However, due to the unevenness of the glass, the pressure applied to the grinding wheel is changed, and the glass is a brittle material. The force is easily broken due to improper force. This requires the spindle to be quickly adjusted as the pressure is changed, that is, it must be rotated at a high speed. It is adaptive and can retreat when the force becomes larger. The technical contradiction resolution matrix is ​​now applied to solve this contradiction and propose corresponding solutions. In the technical property of Table 1 improved, select item 9 "Speed" and select item 14 "Strength" in the deteriorated technical characteristics column. It can be seen that in order to resolve this contradiction, TRIZ provides four solutions, numbered 8, 3, 26, and 14, respectively. By comparing these principles, the principle 14 "slewing, elliptical" is selected, that is, the linear motion is changed into a rotary motion, the cube is turned into an ellipsoid, and a roller and a spherical or spiral object are used. By filtering, select the example CONTACTOVERASPHERICALSUFACE. Thus, point contact can be considered to replace the surface contact of the object. Obviously, this substitution can greatly reduce the friction between the touching objects.

In the improved technical characteristics column, select item 1 "Moving object quality" and select item 3 "Moving object size" in the deteriorated technical characteristics column. The principle 15 "dynamic" is selected among the four solution principles provided, that is, the object is automatically adjusted. It optimizes the performance of each action and stage; divides the object into several components that can be changed and can cooperate with each other; so that the animals are not movable or can be exchanged with each other. Therefore, "air floatation" is considered because the "air floatation" responds quickly to changes in the force of the main shaft, and the cutting force of the main shaft is small, so the required gas pressure is not large.

Inspired by the principle 15 and principle 14 and the related examples given by the software (TechOptimizer), a preliminary solution can be proposed as follows: Firstly, the function to be realized by the spindle is divided, and the function of high-speed rotation and the function of the spindle can be floated up and down. For the high-speed rotation of the spindle, it can be realized by a high-speed motor, and the up-and-down floating function of the spindle is solved by "air-floating".

Considering the special requirements of the spindle, the friction between it and the bearing should be small. Here, the gas is used to lubricate the bearing. Gas-lubricated bearings are commonly used as lubricants, so they are also called air bearings. The air bearing has the advantages of no contact, low friction, low temperature rise, long service life, high speed, and no pollution to the host and the environment.

According to the above analysis and the selection of the bearing and the conception and refinement of the solution, the solution 1 (shown in FIG. 1) can be proposed: the main shaft 3 is supported by the air bearing 4, and the required torque is provided by the single-phase series motor 8. However, it is transmitted through a transmission frame, and the ball 6 is in point contact between the main shaft and the transmission frame. The gas exhausted through the cylinder pushes the main shaft to the distal end before the grinding wheel performs cutting. During machining, the spindle will float up and down as the cutting force changes.

If you select item 9 "Speed" in the Improved Technical Characteristics column, select item 14 "Strength" in the Deteriorated Technical Characteristics column. In the four solutions provided, choose principle 3 "partial change", that is, change the uniform composition of the object or the external environment and function into non-uniformity; let the different parts of the object have different functions; let each part be in the most action Good state. Inspired by principles 3 and 15 and the related examples given by the software, another solution 2 (shown in Figure 2) can be proposed: the rotor 5 is integral with the main shaft 2, and the stator winding 4 is integral with the outer casing. The high-speed rotation function of the main shaft 2 is realized by the action of the stator winding 4 and the rotor 5, and the up-and-down floating function is the same as that of the first embodiment, and is still realized by "air-floating". For bearings, radial air bearings are still used. Its structure is simpler, more compact and easy to maintain.

3. Conclusion

This paper discusses the TRIZ theory and computer-aided innovation integration method, and through the process of seeking two innovative solutions for the floating spindle of glass processing machine, the application of TRIZ technology contradiction matrix and TechOptimizer technology innovation software to solve the product innovation process. Technical difficulties, the method of designing innovative solutions for mechanical products. It shows that the application of TRIZ theory and TechOptimizer technology innovation software can effectively solve the technical problems in technological innovation and product innovation.

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