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Contents Technical Support 5 How to Get Technical Support Before You Contact MTS 5 5 If You Contact MTS by Phone 6 Problem Submittal Form in MTS Manuals 7 Preface 9 Before You Begin Conventions 9 10 Documentation Conventions 10 Introduction 13 Model 680.01 High-Temperature Grips Functional Description Model 680.01 High-Temperature Grip Accessories 15 Model 680.01 High-Temperature Grips Specifications Model 680.
Operation 33 Determine the Gripping Pressure Install Threaded Specimens Install Button-End Specimens Adjust the Water Flow 33 35 37 38 Remove Specimens from the Grips 39 Maintenance 41 Clean the Grips 41 Add Hydraulic Fluid to the Hand Pump 4 Contents 42 Model 680.
Technical Support How to Get Technical Support Start with your manuals The manuals supplied by MTS provide most of the information you need to use and maintain your equipment. If your equipment includes MTS software, look for online help and README files that contain additional product information. 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. Technical support methods MTS web site www.mts.
Know information from prior technical assistance Identify the problem Know relevant computer information Know relevant software information If you have contacted MTS about this problem before, we can recall your file.
If you are calling about an issue that has already been assigned a notification number, please provide that number. You will be assigned a unique notification number about any new issue.
Model 680.
Preface Before You Begin Safety first! Before you attempt to 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 of MTS equipment in your test facility can result in hazardous conditions that can cause severe personal injury or death and damage to your equipment and specimen. Again, read and understand the safety information provided with your system before you continue.
Conventions Conventions Documentation Conventions The following paragraphs describe some of the conventions that are used in your MTS manuals. Hazard conventions As necessary, hazard notices may be embedded in this manual. These notices contain safety information that is specific to the task 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 the directions that are given.
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. Model 680.
Conventions 12 Model 680.
Introduction The MTS Model 680.01 High-Temperature Hydraulic Grips are used with a high temperature furnace installed in a load unit for tension-compression testing of metallic specimens at elevated temperatures. The grips can be heated at temperatures up to 1000°C (1832°F). Contents Model 680.01 High-Temperature Grips Functional Description Model 680.01 High-Temperature Grip Accessories 15 Model 680.01 High-Temperature Grips Specifications Model 680.
Model 680.01 High-Temperature Grips Functional Description The pushrod, grip extension, and replaceable specimen adapters are made of special alloy steel to withstand high furnace temperatures. The base and the grip body are cooled by water flowing through internal passages. The ends of correctly dimensioned button-end specimens are automatically positioned with proper relationship to the pushrod by specimen adapters.
Model 680.01 High-Temperature Grip Accessories The following accessories are available for the grips: Specimen adapters • Specimen adapters • Attachment kits • Cooling kits • A hand-operated hydraulic pump. Specimen adapters are available in various sizes for both button-end and threaded specimens. Specimen adapters are supplied in sets of two and are designed to be used with specimens machined in either SI International or U.S. Customary dimensions.
mount a grip to the actuator rod. Attachment kits are not supplied with a grip set, and they must be ordered separately. The MTS base part number is 052-101-0xx. Each kit contains a mounting stud, a set of spiral washers, and sometimes a shim kit. Each kit is designed to mount the grip to a specific actuator or force transducer.
Hand-operated hydraulic pump A hand-operated hydraulic pump kit (MTS part number 038-634-701) is a required accessory for operating the grips. The kit includes the pump, with shutoff and release valves, a pressure gage, and hydraulic hoses for connecting the pump to the grips. The kit also contains an extra supply of hydraulic fluid. The pump is usually mounted to the base of the load unit (or near it). It includes two hydraulic hoses; one is 1829 mm (72 in) long; and the other is 2286 mm (90 in.) long.
Model 680.01 High-Temperature Grips 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. PARAMETER DIMENSIONA A (mounting threads) M27 x 2mm (1 in–14UNS) B 113 mm (4.44 in) C 241 mm (9.48 in) D 123 mm (4.96 in) E (wrench flats) 29 mm (1.125 in) F (travel) 10 mm (0.375 in) G (specimen adapter wrench flats) 32 mm (1.
Safety Information Hazard Placard Placement Hazard placards contain specific safety information and are affixed directly to the system so they are plainly visible. Each placard describes a system-related hazard. When possible, international symbols (icons) are used to graphically indicate the type of hazard and the placard label indicates its severity.
Model 680.
Installation This section describes how to install the Model 680.01 High Temperature Grips into a load unit. Contents Install the Grips 22 Install the Hand-Operated Hydraulic Pump Install the Cooling Kit 25 26 Preload the Spiral Washers 27 Grip Water Cooling Assembly Configurations for Servohydraulic Frames 29 Typical installation The following diagram shows the main steps to install the grips. Usually the grips are installed along with a furnace.
Install the Grips An attachment kit is required for attaching each grip to the load unit. Kit selection should be based on the mounting threads provided on the grips, which must match corresponding threads on the device (force transducer or actuator rod), to which the grip is to be attached. Refer to the information about the attachment kits.
Preparation Ensure that the threads of all threaded components in the force train (between the load cell and the actuator rod) are clean and in good condition. As necessary, clean the connector studs and the internal threads of the force train element(s) with a wire brush. Inspect all threads for signs of particle contamination or corrosion. All damaged threads should be repaired or the component should be replaced.
B. With the connector stud is facing up, add any required shims, spacers, or spiral washers to the stud. Ensure that the spiral washers are set to their minimum thickness. C. Reposition the grip as necessary for proper thread alignment. Slowly screw the upper grip into the upper element of the force train until it is snugged tight against the spiral washers. Ensure the spiral washers remain set to their minimum thickness. 4. Align the grips. Orientation is not critical.
Install the Hand-Operated Hydraulic Pump When space permits, the hand-operated hydraulic pump can be mounted to the sheet metal base of the load unit. If not, other mounting arrangements will need to be devised. As a minimum, mount the pump on a board or on an adjacent tabletop. Note In order for the pump to operate, the reservoir end of the pump assembly must be higher than the output end (or at least the same elevation). 1. Mount the pump. The preferred location is on the base of the load unit. 2.
Install the Cooling Kit Cooling kits circulate water through the grips to cool the them when they are used in high-temperature situations. The water supply should go to the grip component closest to the force transducer to help keep any heat transfer from the force transducer. 1. Mount a water manifold on each load unit column. 2. Make up and install the tubing loops that are required (as shown in the following figures). Make up the shorter loops first, then the longer ones. 3.
Preload the Spiral Washers The components in the force train must be preloaded to prevent backlash during operation. Preloading is done while a high tensile load is applied to a dummy specimen mounted in the grips. While this load is applied, the spiral washers are adjusted to remove any slack in the force train. When the applied load is removed, the force train remain preloaded.
6. Using spanner wrenches, rotate the two halves of the spiral washers in opposite directions to tighten them. The opening between the washers must not exceed an arc of 30° from the closed position. If more than a 30° arc is created, remove the tensile load from the specimen. Remove the specimen and tighten the grips on the mounting studs, taking care not to misalign the wedge openings. Repeat Step 4 through Step 6 of this procedure. 7. Reduce tensile force to zero and remove the specimen. 8.
Grip Water Cooling Assembly Configurations for Servohydraulic Frames Cut hoses to required length at installation. MTS provides a hose (quantity 1) with the water cooling assembly for conection to the water service. See the following table for the hose length provided by MTS. PART NUMBER COLUMN DIAMETER HOSE LENGTH FOR WATER SERVICE SUPPLIED BY MTS (QUANTITY 1) 048-974-801 2.5–4 in (63.5–101.6 mm) none 048-974-802 2.5–4 in (63.5–101.6 mm) 12 ft (3.65 m) 048-974-803 2.5–4 in (63.5–101.
Hoses to water service 048-974-804 30 Model 680.
Hoses to water service 048-974-805 Model 680.
Model 680.
Operation This section describes how to use the grips.
66.7 kN (15 kip) 8.9 kN at 1000º C (2 kip at 1832º F) 66.7 kN up to 700º C (15 kip up to 1292º F) Load 0 kN (0 kip) 482º C (900º F) Specimen Temperature 1038º C (1900º F) Grip Force Rating versus Specimen Temperature Force versus hydraulic pressure The horizontal scale at the bottom of the graph shows required gripping pressure versus maximum force to be applied, which is shown on the left hand vertical scale. The right hand vertical scale is provided as a convenience.
Install Threaded Specimens Perform the following procedure to mount threaded specimens in the grips. Ensure that all grip parts are sufficiently cool before touching them. WARNING Specimen mounting is a potentially hazardous procedure because hydraulic pressure is applied to the system and actuator movement is required. This can cause personal injury. It can also apply damaging forces to the specimen, furnace, or to other fixtures. Use extreme care while performing the following steps. 1.
WARNING Hydraulic power will be applied to the systems hydraulic actuator during the following steps. This can cause personal injury and/or equipment damage. Exercise caution to avoid having your hands pinched while working near the load unit while hydraulic pressure is applied. If a high-temperature furnace is installed in the load unit, exercise extreme care to prevent the actuator from applying any force to the furnace; severe furnace damage will occur even if minimal force is applied to the furnace. 8.
Install Button-End Specimens Perform the following procedure to mount button-end specimens in the grips. Ensure that all grip parts are sufficiently cool before touching them. • Specimen adapters for button-end specimens are two-piece adapters and must be fully screwed into the grip extensions for operation. • Specimens should have a button thickness no larger than 33 mm (0.540 in). This will correctly position the specimen end for grip operation.
WARNING Hydraulic power will be applied to the systems hydraulic actuator during the following steps. This can cause personal injury and/or equipment damage. Exercise caution to avoid having your hands pinched while working near the load unit while hydraulic pressure is applied. If a high-temperature furnace is installed in the load unit, exercise extreme care to prevent the actuator from applying any force to the furnace; severe furnace damage will occur even if minimal force is applied to the furnace. 5.
Remove Specimens from the Grips WARNING Parts of the grips can be very hot after gripping specimens inside a hightemperature furnace. This can produce very serious skin burns. Do not touch the outer surfaces of the grips while hot. After completing a test, leave cooling water running until the grips are safe to touch. Be aware that the grip extension and specimen adapters will typically be much hotter than the water-cooled grip body or grip base after gripping specimens at elevated temperatures. 1.
Model 680.
Maintenance The Model 680.01 High-Temperature Grips are designed to be used in high temperature environments. After every use in a high temperature environment, the specimen, the adapters, and grip extensions should be cleaned and lubricated. Contents Clean the Grips 41 Add Hydraulic Fluid to the Hand Pump 42 Clean the Grips Specimen adapters and the threaded ends of the grip extension rods should be cleaned and lubricated after each use.
Add Hydraulic Fluid to the Hand Pump Check the fluid level in the reservoir of the hand pump occasionally by removing the pump’s reservoir plug and observing the level shown on the dip stick. If the level is low, add Quaker Quintolubric hydraulic fluid, or equivalent, only. Reservoir Filler Plug Pressure Release Output Pressure Shut-off Valve Difficulty in obtaining or maintaining the pressure required for grip operation may be caused by low fluid level. 42 Model 680.
m MTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: info@mts.com Internet: www.mts.
