MTS 646 User Manual

be certain.

Series 646 Hydraulic Collet Grips Product Information

Model 646.10 Model 646.25

011-558-204 H

Trademark information MTS is a registered trademark of MTS Systems Corporation within the United

States. This trademark may be protected in other countries. Molykote is a registered trademark of Dow Chemical Corporation. All other

trademarks or service marks are property of their respective owners.

Publication information

MANUAL PART NUMBER PUBLICATION DATE

011-558-204 B May 1991 011-558-204 C February 2001 011-558-204 D June 2001 011-558-204 E April 2004 011-558-204 F March 2008 011-558-204 G April 2009 011-558-204 H August 2012

Manual Template 4.3

Contents

Technical Support 5

How to Get Technical Support 5 Before You Contact MTS 5 If You Contact MTS by Phone 7 Problem Submittal Form in MTS Manuals 8

Preface 9

Before You Begin 9

Conventions 10

Documentation Conventions 10

Introduction 13

Series 646 Hydraulic Collet Grips Component Identification 14 About Series 646 Hydraulic Collet Grips 16 About Gripping Specimens 16 Collet Sets 16 Spiral Washers 16 Couplings 17

Specifications 18

Series 646 Hydraulic Collet Grips Dimensions 18 Model 646 Grip with Furnace Extensions Dimensions 19 Series 646 Hydraulic Collet Grips Force and Torque Capacities 20 Series 646 Hydraulic Collet Grips Specifications—Round Specimens 22 Series 646 Hydraulic Collet Grips Specifications—Flat Specimens 23 Series 646 Hydraulic Collet Grips Specifications—Threaded Specimens 24

Safety Information 25

General Safety Practices: Grips and Fixtures 25 General Precautions for Environmental Components 30 Hazard Placard Placement 30

Series 646 Hydraulic Collet Grips Contents

Installation 33

646 Hydraulic Grip Lift Points 33 About Axial Grip Installation 34 Axial Grip Installation Procedure 36 About Axial-Torsional Grip Installation 40 Axial Torsional Grip Installation Procedure 41 Grip Alignment 45 How to Preload the Spiral Washers 45 Grip Water Cooling Assembly Configurations for Servohydraulic Frames 48

Operation 51

Determine the Gripping Pressure 52 Grip Alignment Markings 54 Installing a Collet for a Round Specimen 55 Installing a Collet for a Flat Specimen 56 Installing a Collet for a Threaded Specimen 57 Installing a Round or Flat Specimen 59 Installing a Threaded Specimen 60 Adjust Water Cooling Flow 62 Removing Specimen 63

Maintenance 65

Hydraulic Hoses and Fittings 65 Collets 65 Water Cooling Components 65 Daily Inspections 65

Contents

Series 646 Hydraulic Collet Grips

Technical Support

How to Get Technical Support

Start with your

manuals

Technical support

methods

The manuals supplied by MTS provide most of the information you need to use and maintain your equipment. If your equipment includes software, look for online help and README files that contain additional product inform ation.

If you cannot find answers to your technical questions from these sources, you can use the Internet, e-mail, telephone, or fax to contact MTS for assistance.

MTS provides a full range of support services after your system is installed. If you have any questions about a system or product, contact Technical Support in one of the following ways.

www.mts.com The web site provides access to our technical support staff by means of an

onlineform:

www.mts.com > Contact MTS > Service & Technical Support button

E-mail tech.support@mts.com

Telephone MTS Call Center 800-328-2255

Weekdays 7:00 A.M. to 5:00 P.M., Central Time

Fax 952-937-4515

Please include “Technical Support” in the subject line.

Outside the U.S. For technical support outside the United States, contact your local sales and

service office. For a list of worldwide sales and service locations and contact information, use the Global MTS link at the MTS web site:

www.mts.com > Global MTS > (choose your region in the right-hand column) > (choose the location closest to you)

Before You Contact MTS

MTS can help you more efficiently if you have the following information available when you contact us for support.

Know your site

number and system

number

Series 646 Hydraulic Collet Grips Technical Support

The site number contains your company number and identifies your equipment type (such as material testing or simulation). The number is typically written on a label on your equipment before the system leaves MTS. If you do not know your MTS site number, contact your sales engineer.

Example site number: 571167

When you have more than one MTS system, the system job number identifies your system. You can find your job number in your order paperwork.

Example system number: US1.42460

Know information from

prior technical

If you have contacted MTS about this problem before, we can recall your file based on the:

assistance

• MTS notification number

• Name of the person who helped you

Identify the problem Describe the problem and know the answers to the following questions:

• How long and how often has the problem occurred?

• Can you reproduce the problem?

• Were any hardware or software changes made to the system before the

problem started?

• What are the equipment model numbers?

• What is the controller model (if applicable)?

• What is the system configuration?

Know relevant

computer information

Know relevant

software information

For a computer problem, have the following information available:

• Manufacturer’s name and model number

• Operating software type and service patch information

• Amount of system memory

• Amount of free space on the hard drive where the application resides

• Current status of hard-drive fragmentation

• Connection status to a corporate network

For software application problems, have the following information available:

• The software application’s name, version number, build number, and (if

available) software patch number. This information can typically be found in the About selection in the Help menu.

• The names of other applications on your computer, such as:

– Anti-virus software – Screen savers – Keyboard enhancers – Print spoolers

Technical Support

– Messaging applications

Series 646 Hydraulic Collet Grips

If You Contact MTS by Phone

A Call Center agent registers your call before connecting you with a technical support specialist. The agent asks you for your:

• Site number

• Name

• Company name

• Company address

• Phone number where you can be reached

If your issue has a notification number, please provide that number. A new issue will be assigned a unique notification number.

Identify system type To enable the Call Center agent to connect you with the most qualified technical

support specialist available, identify your system as one of the following types:

• Electromechanical material test system

• Hydromechanical material test system

• Vehicle test system

• Vehicle component test system

Be prepared to

troubleshoot

Write down relevant

information

After you call MTS logs and tracks all calls to ensure that you receive assistance for your

• Aero test system

Prepare to perform troubleshooting while on the phone:

• Call from a telephone close to the system so that you can implement

suggestions made over the phone.

• Have the original operating and application software media available.

• If you are not familiar with all aspects of the equipment operation, have an

experienced user nearby to assist you.

In case Technical Support must call you:

• Verify the notification number.

• Record the name of the person who helped you.

• Write down any specific instructions.

problem or request. If you have questions about the status of your problem or have additional information to report, please contact Technical Support again and provide your original notification number.

Series 646 Hydraulic Collet Grips Technical Support

Problem Submittal Form in MTS Manuals

Use the Problem Submittal Form to communicate problems with your software, hardware, manuals, or service that are not resolved to your satisfaction through the technical support process. The form includes check boxes that allow you to indicate the urgency of your problem and your expectation of an acceptable response time. We guarantee a timely response—your feedback is important to us.

Access the Problem Submittal Form:

• In the back of many MTS manuals (postage paid form to be mailed to MTS)

• www.mts.com > Contact Us > Problem Submittal Form button (electronic

form to be e-mailed to MTS)

Technical Support

Series 646 Hydraulic Collet Grips

Preface

Before You Begin

Safety first! Before you use your MTS product or system, read and understand the Safety

manual and any other safety information provided with your system. Improper installation, operation, or maintenance can result in hazardous conditions that can cause severe personal injury or death, or damage to your equipment and specimen. Again, read and understand the safety information provided with your system before you continue. It is very important that you remain aware of hazards that apply to your system.

Other MTS manuals In addition to this manual, you may receive additional manuals in paper or

electronic form. You may also receive an MTS System Documentation CD. It contains an

electronic copy of the manuals that pertain to your test system, such as:

• Hydraulic and mechanical component manuals

• Assembly drawings

• Parts lists

• Operation manual

• Preventive maintenance manual

Controller and application software manuals are typically included on the software CD distribution disc(s).

Series 646 Hydraulic Collet Grips Preface

Conventions

DANGER

WARNING

CAUTION

Conventions

Documentation Conventions

The following paragraphs describe some of the conventions that are used in your MTS manuals.

Hazard conventions Hazard notices may be embedded in this manual. These notices contain safety

information that is specific to the activity to be performed. Hazard notices immediately precede the step or procedure that may lead to an associated hazard. Read all hazard notices carefully and follow all directions and recommendations. Three different levels of hazard notices may appear in your manuals. Following are examples of all three levels.

Note For general safety information, see the safety information provided with

your system.

Danger notices indicate the presence of a hazard with a high level of risk which, if ignored, will result in death, severe personal injury, or substantial property damage.

Warning notices indicate the presence of a hazard with a medium level of risk which, if ignored, can result in death, severe personal injury, or substantial property damage.

Caution notices indicate the presence of a hazard with a low level of risk which, if ignored, could cause moderate or minor personal injury or equipment damage, or could endanger test integrity.

Notes Notes provide additional information about operating your system or highlight

easily overlooked items. For example:

Note Resources that are put back on the hardware lists show up at the end of

the list.

Special terms The first occurrence of special terms is shown in italics.

Illustrations Illustrations appear in this manual to clarify text. They are examples only and do

not necessarily represent your actual system configuration, test application, or software.

Electronic manual

conventions

This manual is available as an electronic document in the Portable Document File (PDF) format. It can be viewed on any computer that has Adobe Acrobat Reader installed.

Preface

Series 646 Hydraulic Collet Grips

Conventions

Hypertext links The electronic document has many hypertext links displayed in a blue font. All

blue words in the body text, along with all contents entries and index page numbers, are hypertext links. When you click a hypertext link, the application jumps to the corresponding topic.

Series 646 Hydraulic Collet Grips Preface

Conventions

Preface

Series 646 Hydraulic Collet Grips

Introduction

646 Hydraulic Collet Grip

Contents Series 646 Hydraulic Collet Grips Compon ent Identification 14

MTS Series 646 Hydraulic Collet Grips grasp and hold a specimen in place during testing, and provide a constant, hydraulically actuated gripping force regardless of the applied test loads. They are designed to perform in a wide variety of testing applications including high and low cycle fatigue, tension, and compression testing.

About Series 646 Hydraulic Collet Grips 16 Specifications 18

Series 646 Hydraulic Collet Grips Introduction

Series 646 Hydraulic Collet Grips

What you need to

know

This manual assumes that you know how to use your system controller. See the appropriate manual for information about performing any controller-related step in this manual’s procedures. You are expected to know how to do the following:

• Turn hydraulic pressure on and off.

• Select a control mode.

• Manually adjust the actuator position.

• Monitor a sensor signal.

• Zero a sensor output.

Related products The grips are usually controlled with a dedicated hydraulic supply. See the Series

685 Hydraulic Grip Supply Product Information manual (MTS part number 015-

205-001).

Actuator

Rod

Load Unit Base Plate

Shim

Spiral Washers

Threaded Mounting Stud

Lower Grip

Hydraulic Pressure and Return Ports

Collets

Lower Coupling

Upper Grip

Threaded Mounting Stud

Spiral Washers

Shim

Upper Coupling

Adapter Plate

Force Transduc er (attached to the load unit crosshead)

Axial Grip Mounting

Axial/T o rsio nal Grip Moun tin g

Series 646 Hydraulic Collet Grips Component Identification

Introduction

Series 646 Hydraulic Collet Grips

Hydraulic Grip Components

TEM DESCRIPTION

Load unit crosshead and base plate

Force transducer

Hydraulic pressure and return lines

Upper and lower grips

Collet

Actuator rod

Provides the structure to mount the grips and other components in the force train. It is also the reaction mass for the force train. The crosshead and base plate are connected with columns.

Measures the axial forces applied to the specimen. An axial-torsional version also measures the rotational forces applied to the specimen.

The force transducer can be located in the base or the crosshead of the load unit.

Ports the hydraulic fluid to and from the grips. The hydraulic fluid comes from a dedicated hydraulic grip supply that produces 45 MPa (6500 psi). Each grip has two hydraulic lines connected to it, a hydraulic pressure line and a hydraulic return line.

Clamps a specimen in place. The grips house the collets and the hydraulic components that operate the grips.

Contacts and holds the specimen in place. Collets are available for flat, round, and threaded specimens.

Applies axial forces to a specimen. The actuator is a hydraulically powered device that provides linear displacement of (or forces into) a specimen. For axial-torsional systems, the actuator applies both axial and torsional forces to the specimen.

The actuator rod can be located in the base or the crosshead of the load unit.

Axial attachment kit

Shims

Spiral washers

Mounting stud

Adapter plate

Upper and lower couplings

Includes the required components to install the grips. Each grip model/load unit model combination has a unique attachment kit.

Allows further rotation of the grips to change the orientation of the spiral washers so the appropriate opening is set. When axial grips are installed, the upper and lower grips might not be aligned after being screwed onto the mounting studs. Shims can be added so that the amount of rotation can be changed. The shims are available in thicknesses that correspond with 1/8 to 1/2 turns of rotation.

Ensures preloading without inducing offsets in the force train. They provide a backlash-free union of threaded components.

Mounts the grips to the other components in the force train. Connector studs are threaded rods that connect the grips with an actuator rod or force transducer.

Allows axial-torsional grips to be mounted to a force transducer. The adapter provides the thread needed to use the couplings.

Clamps the grips to the to the actuator and force transducer. The couplings have left and right handed threads that preload the grip connection and prevents backlash in the force train.

Series 646 Hydraulic Collet Grips Introduction

About Series 646 Hydraulic Collet Grips

Preload Chamber

Grip Piston

Grip Housing

Collet

Hydraulic Release Port

Hydraulic Pressure Port

The Series 646 Hydraulic Collet Grips are mounted in a load unit to secure the specimen under test. Hydraulic pressure to the grips is supplied by an external hydraulic grip supply.

Grip Cross Section

About Gripping Specimens

The grips provide a constant, hydraulically actuated gripping force regardless of the applied test loads. When hydraulic pressure is applied, it pulls the grip housing towards the piston, forcing the collet to clamp the specimen. The pressure applied to the preload chamber locks all moving grip parts in position. This eliminates backlash when cycling between tension and compression.

The specimen gripping force is adjustable to prevent specimen damage by the grips or specimen slippage during the test. Each grip (upper and lower) is independently actuated.

Collet Sets

The grips require collet inserts to accommodate the type of specimen. Various specimen geometries may be easily accommodated by changing only the collet sets. Three types of collets are available; round, flat, and threaded.

Spiral Washers

The optional Model 601 Spiral Washers are commonly used when installing axial grips. They provide fatigue-resistant connections between elements of the force train and minimize the effects of backlash.

Introduction

The spiral washers are placed over the connector studs and adjusted to place a constant preload on the stud. The spiral washers also minimize the possibility of backlash due to loose-fitting or worn stud threads. When cyclic loads below the tensile force level of the preload are applied to the connections, the load is

Series 646 Hydraulic Collet Grips

Couplings

distributed between the surfaces of the spiral washers and the stud in a ratio of the relative stiffness of the parts. The spiral washers have a large surface area and therefore greater stiffness. They react to most of the load and keep the stress in the stud below its fatigue runout level.

Special upper and lower couplings clamp the grips to the actuator and force transducer for axial-torsional grips. Each coupling has two different thread patterns; a right hand thread with a pitch of 3 mm and a left hand thread with a 2 mm pitch. Half of the coupling matches the thread of the grip and the other half matches the thread of the actuator or force transducer adapter. Each coupling is marked to indicate which direction to tighten it and how much torque to lock it down.

Series 646 Hydraulic Collet Grips Introduction

Specifications

Contents Series 646 Hydraulic Collet Grips Dimensions 18

Series 646 Hydraulic Collet Grips Force and Torque Capacities 20 Series 646 Hydraulic Collet Grips Specifications—Round Specimens 22 Series 646 Hydraulic Collet Grips Specifications—Flat Specimens 23 Series 646 Hydraulic Collet Grips S pecifications—Thread ed Specimens

Series 646 Hydraulic Collet Grips Dimensions

The following sections provide the dimensions of the Series 646 Hydraulic Collet Grips.

Series 646 Collet Grip Dimensions

ODEL ABCCONNECTOR STUD

646.10 Axial 107.4 mm (4.23 in)

646.25 Axial 171.7 mm (6.76 in)

646.10 Axial/Torsional 107.4 mm (4.23 in)

646.25 Axial/Torsional 171.7 mm (6.76 in)

* Left Handed Threads

Introduction

171.5 mm (6.75 in)

254 mm (10.0 in)

171.5 mm (6.75 in)

254 mm (10.0 in)

–7.2 mm

4.0 (0.16

4.6

–9.4 mm

(0.18

36.5 (1.44

54.1 (2.13

–0.28 in)

–0.37 in)

–39.6 mm

–1.56 in)

–58.9 mm

–2.32 in)

Series 646 Hydraulic Collet Grips

M27 x 2 (1-14)

36 x 2 (1 1/2-12)

M68 x 2

M92 x 3

Model 646 Grip with Furnace Extensions Dimensions

Mounting holes in the base of each grip are threaded in either SI International (millimeter) or U.S. Customary (inch) thread dimensions, as shown for dimension “A” in the pervious table.

Specifications

ARAMETER

A (mounting threads) B 172 mm (6.77 in) C 224 mm (8.80 in) D 115 mm (4.52 in)

E (wrench flats) 29 mm (1.125 in) F (travel) 3.2 mm (0.125 in) G (specimen adapter wrench flats) 32 mm (1.25 in) H (maximum diameter) 38 mm (1.5 in) Weight (each grip) 18.5 kg (40.8 lb)

* SI International (U.S. Customary)

DIMENSION

M27 x 2mm or 1 in

–14

Series 646 Hydraulic Collet Grips Introduction

Specifications

Torque (in-lbs)

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

6 mm dia .25" dia .375 " dia .5" dia 15 mm dia .75" dia 20 mm dia 1" dia 30 mm dia

4000

6000

2000

8000

10000

12000

14000

16000

18000

20000

22000

Force (lbs)

Specimen

Diameter

Series 646 Hydraulic Collet Grips Force and Torque Capacities

The amount of torque the grips can produce is reduced with biaxial operation. The amount of torque is affected by the amount of axial force and the size of the specimen. The following graphs illustrate the axial-torsional perfor mance envelope of the Model 646.10 and Model 646.25 Hydraulic Collet Grips.

Series 646 Collet Grip Specifications

ODEL

AXIAL CAPACITY

TORSIONAL CAPACITY

646.10 Axial 100 kN (22 kip) – 18 kg (40 lb)

646.25 Axial 250 kN (55 kip) – 72 kg (160 lb)

WEIGHT

646.10 Axial/Torsional 100 kN (22 kip)

646.25 Axial/Torsional 250 kN (55 kip)

* Ratings are at 45 MPa (6500 psi).

1100 N

·m (10,000 lbf·in)

2200 N

·m (20,000 lbf·in)

18 kg (40 lb) 72 kg (160 lb)

Introduction

Model 646.10 Maximum Torque versus Axial Load

Series 646 Hydraulic Collet Grips

Specifications

Torque (in-lbs)

5000

10000

15000

20000

.25 " dia .375" dia .5" dia .75" dia 20 mm dia

4000

6000

2000

8000

10000

12000

14000

16000

18000

20000

22000

Force (lbs)

Specimen

Diameter

Model 646.25 Maximum Torque versus Axial Load

Note The Series 646.25 Axial-Torsional Grips are capable of holding full

torque and full load with specimen sizes greater than 24.6 mm (0.97 in).

Series 646 Hydraulic Collet Grips Introduction

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