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NUT CRIMPING TOOL

IP.com Disclosure Number: IPCOM000249334D
Publication Date: 2017-Feb-17
Document File: 3 page(s) / 506K

Publishing Venue

The IP.com Prior Art Database

Abstract

Crimping is process of compressing sheet metal into small fold or ridge. Crimping is generally used to permanently assemble mechanical components. One of the applications is to permanently lock a nut with spline. It is achieved using a crimp nut and crimping between splines at 1 or more places. The fold created prevents the nut from unlocking. This is explained below graphically.

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NUT CRIMPING TOOL

1. Introduction

Crimping is process of compressing sheet metal into small fold or ridge. Crimping is generally used to

permanently assemble mechanical components. One of the applications is to permanently lock a nut with

spline. It is achieved using a crimp nut and crimping between splines at 1 or more places. The fold created

prevents the nut from unlocking. This is explained below graphically.

1.1 Background/Problem

Crimping is done using a hand chisel or an automated tool which mimics a chisel. There are two critical

parameters which determine correct crimp.

1. Force – Lesser than required force will create insufficient or non functional crimp. Higher than

required force will cut the nut wall.

2. Location – Crimping tool should strike exactly in between splines otherwise tool shears the nut

wall against splines (at Shear point).

2. Proposed Design

2.1 Construction and features

• Ram block and Retainer block are fastened together using screw 1.

• Crimp tips are fastened to ram block and are retained in slots made on inside of retainer block.

• Stopper has shims between it and ram block. This facilitates adjusting amount of crimping.

• Crimp tips and Stopper are easily & individually replaceable. These are the only 2 parts that will

wear.

2.2 Operation

Crimp tips locate the tool in-line with the splines. This means the tool aligns

itself with splines on component and takes care of minor misalignments.

Since Crimp tips are engaged between splines the tool i...