Percussion Drilling Device Shrink-Fit Ring Insert
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Solution Overview
Problem
Percussion drilling devices require complex and time-consuming friction welding processes for connecting the front and rear sections, which increases manufacturing time and costs, and limits design simplicity.
Innovation Solution
Incorporating a ring insert in the housing impact section that can transfer mechanical energy from the main piston, allowing the housing to be made from a single pipe and eliminating the need for friction welding, with the ring insert being either rigidly or moveably connected to the drilling head tip and retained via a shrink-fit mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If friction welding is used to connect the front and rear sections of the housing, then the structural integrity is improved, but the manufacturing complexity and time increase
Solution Approach 1:
The housing is divided into two separate parts: a rear section made from mild steel pipe and a front section made from higher-grade steel. These sections are connected through a ring insert rather than friction welding, allowing each part to be manufactured independently with appropriate materials while maintaining overall structural integrity.
Solution Approach 2:
A ring insert is introduced as an intermediary component between the front and rear housing sections. This ring insert serves as the connection element that replaces the need for friction welding, simplifying the manufacturing process while maintaining the structural connection between the two housing sections.
2Strength
If friction welding is used to connect the housing sections, then the structural connection is improved, but the manufacturing time increases
Solution Approach 1:
The ring insert is designed to be fitted into the rear housing section before the front section is attached. This preliminary placement simplifies the assembly process and eliminates the need for time-consuming friction welding operations, thereby reducing overall manufacturing time while maintaining structural connection.
3Adaptability or versatility
If the housing is made in two parts with friction welding, then the material selection flexibility is improved, but the machining requirements increase
Solution Approach 1:
Different material qualities are applied to different parts of the housing: the rear section uses mild steel pipe while the front section uses higher-grade steel. The ring insert, made from higher-grade steel, is fitted into the rear section and provides the necessary connection point, allowing each component to be optimized for its specific functional requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution simplifies the manufacturing process, reduces costs, and enhances energy conversion efficiency, enabling better comminution of obstacles and improved driving stability by concentrating percussion impulses on the drill head tip, while maintaining structural integrity.
Implementation Method 1
The ring insert is disposed in the housing in such a way that it transfers at least part of the energy of the main piston onto the housing
Implementation Method 2
The ring insert may be disposed in the housing in that a temperature difference is generated between the ring insert and the housing section, through which the internal diameter is temporarily enlarged and/or the outer contour is temporarily reduced in size
Data Source
AI summary
A percussion drilling device for drilling in earth includes at least one housing section for a main piston, and a ring insert arranged in the housing section in front of the main piston so that the ring insert transmits at least part of the energy of the main piston onto the housing. The ring insert is attached to the housing by a shrink-fit connection.