Tool is inexpensive and gives repeatable results. It is modified commercially-available rod-type weld slag removal gun and is pneumatically operated by regulated compressed air supply

Caruso, V. P.

Minter, E. J.

English

NASA Technical Reports Server

n Pneumatic Peening Gun 
.
December 1974
NASA TECH BRIEF 
Marshall Space Flight Center
B74-10237 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Mechanical Rod Peening 
Air Pressure	 I Inlet 4	 . 
Lever-Type Throttle 
rseguualeu	 Rod Bundle 
A tool for the mechanical rod peening of ductile 
materials has been developed. The tool is inexpensive 
and gives repeatable results. The tool (see figure) is a 
modified commercially-available rod-type weld slag re-
moval gun. It is pneumatically-operated by a regulated 
compressed air supply. 
The modification consists of grinding appropriate 
radii on the rod ends. Radii are selected in accordance 
with the material to be peened, and the air pressure is 
then regulated to provide the desired intensity. In one 
instance, the gun has a bundle of 19 rods, each 0.032 cm 
(1/8 in.) in diameter. The bundle is driven forward by a 
pneumatic mandrel and is returned by spring force to 
provide a reciprocating motion of 4600 blows per 
minute. Maximum air pressure is limited to 62 N/cm2 
(90 psi). 
The peening gun is calibrated to provide the desired 
intensity by using the standard Almen strip method 
(Mil. Spec. MIL-S-13 165). Uniform intensity is achieved 
during peening by holding the gun normal to the surface 
of the material.
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Code ATO1 
Marshall Space Flight Center, Alabama 35812 
Reference: B74-10237 
Patent status: 
This invention is owned by NASA, and a patent 
application has been filed. Inquiries concerning non-
exclusive or exclusive license for its commercial develop-
ment should be addressed to: 
Patent Counsel 
Marshall Space Flight Center 
Code CCOI 
Marshall Space Flight Center, Alabama 35812 
Source: E. J. Minter and V. P. Caruso

Marshall Space Flight Center

(MFS-2 3047) 
Category 07, 08 
This document was prepared under the sponsorship of the National
	
Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19740000237 2020-03-17T13:53:53+00:00Z


Mechanical rod peening

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server