In the machining and production process, titanium alloy fasteners are widely used. In the process of use, the weight of the machine itself can be reduced. This is a lightweight material, especially in the aerospace field. With the development of science and technology in recent years, the use of titanium alloy fasteners has continued to expand, which can closely connect titanium alloys with other materials, which is of great significance for machining and production.

 

Titanium alloy fasteners have problems in machining

 

1.1 Production problems of mechanical processing machines

 

In the production and processing process of titanium alloy fasteners, the processing requirements of the workshop are higher. In the processing of lathes, the density of titanium alloy fasteners is relatively higher than other materials, and the technical requirements and processing difficulties for processing will be higher. The technical requirements in these processing processes have certain processing difficulties for the production factory. During the processing, the wear degree of the cutting tool will be more serious. It is necessary to find a higher quality alloy tool to be able to carry out the processing and production process. In order to reduce costs, this is a significant problem in the machining and production of titanium alloy fasteners, and it is necessary to carry out reasonable adjustment of the plan and improvement of the processing process and processing conditions.

 

1.2 Processing and preservation corrosion problems of titanium alloy fasteners

 

In the process of machining titanium alloy fasteners, because the tightness of the mechanical parts is not so high when the fasteners are installed, it is easy to generate a certain gap, so that there will be a surface between the metal gaps. Paint flows in, making fasteners susceptible to corrosion during production. In the subsequent use process, the connection tightness will be affected. The reason why titanium alloy materials have high corrosion resistance is because of the presence of oxygen in the air. A protective film is formed on the surface of the titanium alloy material after the oxidation reaction with oxygen. This layer of film can effectively protect the titanium alloy inside the material from being oxidized, thereby improving the corrosion resistance of the titanium alloy material. However, in the actual machining process of titanium alloy fasteners, due to the constant changes in the environment, including the influence of factors such as the temperature of the surrounding environment, humidity, and the oxidation of equipment during processing, it will lead to titanium alloy fasteners. Corrosion is easy to occur, which is one of the problems that are prone to occur in the production process of titanium alloy fasteners.

 

 

1.3 Precision problems of machining titanium alloy fasteners

In the production and processing of titanium alloys and candied fruit, the precision requirements for machinery will be higher. In mechanical production, because the tool is in a state of wear and tear during each production process, and it is calibrated according to the program, the density of titanium alloy fasteners is higher, and the tool is easily worn during the machining process. Under the state, the tool is still processed according to the program, it is easy to cause the precision of the compact parts to be affected during the processing. If the precision of the fasteners is not strictly controlled within the error range during the entire processing process, the titanium alloy and other materials cannot be tightly connected during the use process, which will have a certain impact on the subsequent use. The precision of titanium alloy fasteners in the machining production process is a major problem that needs to be overcome in the production process. For example, the fastener process product shown in Figure 1 is a product made in a high-precision production workshop, and this product has better connection performance.

 

Effective improvement measures to improve the processing quality of titanium alloy fasteners

 

2.1 Strengthen the regulation of mechanical processing production equipment

In the process of mechanical production and processing of titanium alloy fasteners, the requirements for equipment and the regulation of equipment are relatively higher, ensuring the accuracy of equipment during processing. Fasteners are machined and produced within tolerance. When choosing a cutting tool during processing, it is necessary to consider the material. It is necessary to consider the damage resistance of the processing tool and the density of the processing tool, what is the rigidity of the processing tool, and whether it can cut titanium alloy-related materials. The mechanical coolant also needs to be controlled in time. If the mechanical coolant is too small, it will affect the precision of the machining process. If the coolant is found to be too small, the coolant should be added in time.

 

 

When choosing titanium alloy fasteners to process tools, because titanium alloy materials have relatively higher stiffness and density, when choosing tools, choose tools with higher density as much as possible. Cutting will cause high temperature. Under high temperature conditions, it is necessary to ensure that the materials of titanium alloy fasteners and tools will not be affected, so when selecting materials, you need to choose high temperature resistant materials.

 

In the process of machining, it is also necessary to consider the degree of sealing of titanium alloy fasteners and the roughness of the surface. During processing, surface grinding treatment is required to ensure that fasteners can accurately connect titanium alloy materials and Other materials, so analysis and selection are required when selecting the coating material on the surface of the fastener.

 

 

Since the titanium alloy material is easily deformed during the machining process, and the elastic modulus of the titanium alloy material is relatively small, the requirements for the fixture are also relatively high during the processing process. In the process of mechanical production and processing, the clamping force of the fixture should not be too large. When the titanium alloy material is produced, auxiliary fixtures can be selected. In the fixture design, it is also necessary to consider the problems in the processing process, so as to avoid Problems related to fastener deformation during processing.

 

2.2 Control the selection of machining raw materials

In the process of machining and production of titanium alloy fasteners, the selection of titanium alloy raw materials must be controlled in place. The material selection requirements for titanium alloy fasteners are higher, and the relevant testing standards for materials must be strict when selecting. In accordance with the fastener standards, in the process of testing, we must ensure that the properties of the fastener material meet the requirements.

 

Processing on such a basis will not easily cause processing problems during the processing process, and the product inspection certificate and various performance index indicators of the product need to be sorted and classified. There are many performance indicators related to the detection of fasteners, such as the specification, quantity, and size of the materials used, as well as the performance testing of the mechanical properties, corrosion resistance, and high temperature resistance of the materials.

 

2.3 Improve the working environment of machining fasteners

In the production process of titanium alloy fasteners, the environmental control of the machining production process is relatively more demanding. In the required processing environment, the processing of titanium alloy fasteners can be made more standard and the fastening performance is better. , the sealing performance is better. When the product is used, there will be no related quality problems when connecting titanium alloys. During the mechanical production process of fasteners, there will be requirements for the temperature of the processing environment and the humidity of the processing environment around the processing.

 

Because the fastener parts produced are related materials of titanium alloys, they are easy to oxidize in the environment. If the temperature and humidity are too high, it is easy to produce chemical reactions in the process of contacting with other materials, especially some metal aluminum, metal lead, etc. The chemical materials of titanium alloy are more likely to cause secondary chemical reactions. The fasteners produced in this processing environment cannot be used normally. Therefore, in the process of processing titanium alloy fasteners, the factory needs to take environmental protection measures. Avoid mixing fasteners with other metal products. When controlling the processing environment, it is necessary to have relevant equipment and instruments and do a good job in management.

 

2.4 Strengthen the control of the machine tool in the fastener production workshop

The machine tool for the production of titanium alloy fasteners needs to be strictly controlled. The precision of the machine tool, the precision of the cutting tool on the machine tool, the quality of the cutting tool, and the material of the cutting tool need to be controlled, and it needs to be produced in strict accordance with the specifications. Production is required to be within the tolerances of the specification.

The first aspect that needs to be controlled is the structure of the titanium alloy machine tool. During the production process of the parts, the load that needs to be endured will be larger, and the pulling force that needs to be endured will be larger. Therefore, the entire machine tool needs to meet the technical requirements in these aspects, and prepare to reduce the punching of titanium alloy materials in areas with relatively large tensile forces. When drilling, it should be in an area with relatively small tension, so as to ensure the accuracy of the titanium alloy fastener material and ensure the roughness of the material surface.

 

When using lathe technology, relatively advanced lathe processing and production technology at home and abroad should be adopted. When introducing lathes, it is necessary to have an overall understanding of the processing links of titanium alloy materials. In the process of production machining, it is necessary to ensure that the titanium alloy is punched. The degree of accuracy, especially when using high-hardness and high-rigidity material knives to punch holes, must ensure that the wear degree of the blade surface is within a certain range, so as to meet the production requirements of titanium alloy fastener materials. It is necessary to repair and polish the overall tool after each processing and production, and ensure that the tool is always within the error range, so as to ensure that the entire titanium alloy material can meet the technical requirements during the machining and production process.

 

2.5 Strengthen the quality control in the mechanical production of fasteners

 

Titanium alloy fasteners need to control the quality requirements of processing fasteners during the processing process, that is, quality control. In quality control, strict control is required for the quality control of lathes, the control of cutting tools, the control of processing materials, and the control of workshop environment. During grinding and reprocessing, to ensure the normal workability of mechanical production, regular inspections of machinery are also required.

In terms of quality control, due to the special properties of titanium alloy materials in all aspects, the material needs to be cooled and protected during the cutting process, especially in such a high temperature processing environment, it must be done Do a good job of safe processing to reduce the probability of hidden dangers in the processing plant. In the event of a fire, talc powder can be used for fire-fighting related work. All of these should be prepared with relevant plans and measures before the fastener processing. If there is an emergency, it must be dealt with in time, especially when an emergency occurs, titanium alloy materials are easy to chemically react with other materials. Thereby aggravating the severity of emergencies, which is the quality control that needs to be done in the machining process.