Thread Bottom Hole Dimensions Before Extruding Threads in Thread Processing

Introduction

Threading is a common machining process that is used in many industrial applications. It involves forming threads on the surface of a component by cutting with a tool. This process is used to join two components together in a secure manner. The strength of the resulting joint depends on the quality of the thread. To ensure strong and leak-proof connections, accurate tolerances must be maintained during threading. This accuracy is typically achieved through the use of steel dies for cutting and rolling the thread. In some cases, threading can be machined using processes such as tapping or thread milling.

Compression threading is a process similar to regular threading, but it involves the use of additional tools called “compression dies” to apply a compressive force to the threads while they are being machined. This process is used to increase the strength and integrity of a thread connection by increasing the contact surface area between the threads. To ensure the accuracy of the threads, the bottom hole of the component being threaded must have a precise diameter.

The bottom hole size plays an important role in determining how accurately the thread will be formed. If the hole is too small or too large, the compression force will not be able to form an accurate thread. For this reason, it is important to accurately measure the bottom hole diameter of the component before the compression threading process can begin. Typically, the hole size is measured with a caliper or measuring gauge. After measuring the hole, the desired diameter may be determined by referencing a chart or formula that is specific to the particular threading process.

Once the proper size of the bottom hole has been determined, the threading process can begin. The component is then placed in the compression die and a tool is used to form the thread. The tool cuts the thread into the component with a pair of grooves. As the tool is rotated, the compression die forces the threads together, tightly bonding the components together. After the thread has been formed, the excess material is removed and a finish is applied to the thread.

The accuracy of the bottom hole diameter is crucial to the success of compression threading. If the hole is not properly sized, the threads will not be securely bonded and the connection could fail. It is important to use a high-precision measuring device to ensure the proper size of the bottom hole. Additionally, the use of a threading lubricant is recommended to reduce friction and extend the life of the tooling. With correct measurements and the proper tooling, compression threading can provide strong and reliable connections for a variety of applications.

The tapped hole is an important step in the processing of thread. The size of the tapped hole of the thread bottom before extruding thread has a great influence on the quality of the thread. The size of the tapped hole directly affects the amount of extrusion in thread extrusion and the strength of the thread. Therefore, the size of the tapped hole must be strictly controlled.

First of all, the depth of the tapped hole should be greater than or equal to the pitch of the thread. This can ensure that the thread is completed on the tapped hole, and the thread is arranged neatly and the threads are tight. Secondly, the diameter of the tapped hole should be 0.1-0.2mm larger than the nominal value of the thread diameter. The tapped hole is slightly larger than the thread to allow for the increased clearance of the finished thread shaped by the die.

Finally, when extruding thread, the cutter should be properly absorbed on the tapped hole. This can make the threads arranged on both sides of the groove consistent, reduce the possibility of thread chiseling and ensure the plasticity of the thread. Quenching and tempering can prevent resinification of the thread after quenching.

In short, the size of the tapped hole of the thread bottom before extruding thread has a great influence on the quality of the thread. The depth of the tapped hole should not be less than the pitch of the thread. The diameter of the tapped hole is 0.1-0.2mm larger than the nominal value of the thread diameter, and the cutter should be properly absorbed on the tapped hole during thread extrusion. After thread extrusion, quenching and tempering should be carried out to prevent resinification of the thread.