Ametek NB-3010 Manuale utente

BRINELL HARDNESS TESTER

MODEL NB-3010

Including Appendix for Retroﬁt of HB3000 to NB3010

OPERATING INSTRUCTIONS

V 1.0

Issue 06/2016

Contents

1. APPLICATION INFORMATION 1

2. GENERAL INFORMATION 1

2.1 Technical Data 1

2.2 Items Shipped with Unit 1

2.3 Accessory/Ship Kit Contents 1

2.4 Options 1

3. MECHANICAL DESCRIPTION 2

3.1 Frame and anvil (See Parts Location Diagram on Page 8) 2

3.2 Load Lever Mechanism (See Parts Location Diagram on Page 8) 2

3.3 Rod Assembly (See Parts Location Diagram on Page 8) 2

3.4 Pneumatic Tube Assembly (See Parts Location Diagram on Page 8) 2

3.5 Electronic Control System (See Parts Location Diagram on Page 8) 3

4. INSTALLATION (See Parts Location Diagram on Page 8) 4

Tester Footprint Drawing for bolting the tester to the work table. 4

5. TEST SETUP and OPERATION 6

5.1 Setting up Indenter and Anvil 6

5.2 Selection of Test Load 6

5.3 Load a Test Specimen 7

5.4 Selecting Time-at-load 7

5.5 Initiating a Test 7

5.6 Test Completion 7

5.7 Brinell Scope Measurement 7

6. PARTS LOCATION DIAGRAMS 8

7. THE BRINELL TEST METHOD 9

7.1 The ASTM Speciﬁcation 9

8. MAINTENANCE 11

9. CONTACT INFORMATION 11

Appendix A: Instructions for Converting NB3010 from Electric to Air 12

Appendix B: Brinell Conversion Charts 15

ONE YEAR LIMITED WARRANTY 18

1. APPLICATION INFORMATION

The tester is used for determining the Brinell hardness of un-quenched steel, cast-iron,

nonferrous metals and soft bearing alloys. This tester can be used in metallurgical

plants, machine manufacturing plants, metal working plants , industrial laboratories,

and laboratory environments.

The measuring range of hardness is 8-450 HBS when steel ball indenter is used, and

8-650 HBW when a tungsten carbide ball indenter is used.

2. GENERAL INFORMATION

2.1 Technical Data

Loads available (kg) 62.5, 187.5, 250, 500, 750, 1000, 1500, 3000

Selectable Time-at-Load 12, 30, 60 sec.

Diameter of ball 10 mm.

Duration of loading 12, 30, 60 sec.

Max. height of test -piece 9"

Depth of throat 4.5"

Power supply 110 V., 60Hz

Dimensions (L x W x H) 9"W x 34"H x 28"D

Net weight 440 lbs.

Air requirements 60 psi, 0.4 cfm.

2.2 Items Shipped with Unit

Set of weights

Weight Hanger

Large Flat Anvil (installed on elevating screw)

Accessory Kit and Ship Kit Contents (see below)

2.3 Accessory/Ship Kit Contents

Flat Anvil Operating Instructions

Vee Anvil Hold-down hardware

Power Cord Set of Leveling Feet

Set of wrenches [2] spare fuses

Brinell Test Block, HB30 10mm ball indenter with carbide ball and cert.

Brinell Chart Certiﬁcate of calibration for tester

2.4 Options

Foot pedal switch

2.5 and 5 mm indenters

20 X Brinell Scope with multiple adjustment

3. MECHANICAL DESCRIPTION

3.1 Frame and anvil (See Parts Location Diagram on Page 8)

The hardness tester has a cast iron frame (1). An elevating screw seat (18) is set on

the stage at the front of the frame. The removable anvil (24) is set on the elevating

screw (22), which is ﬁtted precisely into the seat (18). The handwheel (21) elevates the

elevating screw. A steel ball detent (19) is located between handwheel (21) and nut

(20). When the indenter (25) is in contact with the specimen and reaches certain force

as the elevating screw is raised, the handwheel slips which ensure proper force within

an allowable range. Set the ball detent to allow the handwheel to slip at the proper

point. Check the detent in the lowering mode to set the slippage of the elevating

screw.

3.2 Load Lever Mechanism (See Parts Location Diagram on Page 8)

The lever mechanism consists of a large lever (4), small lever (29), hanger (3), and rod

(27), etc.. The arm ratio is 1:12.5 for the large lever, 1:4 for the small lever and overall

ratio is 1:50 for the lever system. The test force is applied to the test piece by the lever

system. On the long arm of large lever is the hanger on which the load weights (7) are

suspended. By the combining weights differently, test loads can be changed. (See

page 6.) The test force is applied when the pneumatic cylinder's piston rod (6) retracts

allowing the weights to descend and apply the load through the fork rocker (5), large

lever (4), small lever (29), rod (27), and main shaft (26).

CAUTION: The load weights should be positioned so that they completely overhang

the edge of the tabletop on which the tester is installed. If this is not done, whenever

the operator fails to raise the indenter to contact against the test specimen, the load

weight assembly can over-travel during the test cycle so that the hanger can come off

the lever and possibly allow the weights to fall.

3.3 Rod Assembly (See Parts Location Diagram on Page 8)

The rod assembly consists of a spring (28), rod (27) , and main shaft (26) etc. While

idle, the spring presses the main shaft in the conical hole and cause the rod to remain

close to the middle knife support of small lever (29) so as to keep the rod in the proper

position. When the test specimen touches the indenter, the main shaft is raised, thus

determining the starting position for the test.

3.4 Pneumatic Tube Assembly (See Parts Location Diagram on Page 8)

The air regulator should be set at 60 psi. The Pneumatic tube assembly consists of the

cylinder mounting bracket (17), the pneumatic cylinder (8), the piston rod (6), the pres-

sure regulator (16), and the fork rocker (5).

3.5 Electronic Control System (See Parts Location Diagram on Page 8)

The electronic control system consists of a solenoid (23) and printed wiring board (30),

etc. Depress the start button (5A) to bring the solenoid into action. The pneumatic

cylinder (8) starts to empty, and the indicator light for loading (1A) is lit. The piston rod

(6) descends, dropping the fork rocker (5) slowly downward and the roller is separated

from the large lever. The piston rod is stopped and the electronic face plate light for

test duration (2A) is lit as the load is applied. When the duration time (12, 30 or 60 sec-

onds) is completed, the pneumatic cylinder (8) reverses the process by means of the

solenoid. The electronic faceplate light for unloading (3A) is lit and the piston rod raises

the large lever again. When the roller at the end of the Fork Rocker comes into con-

tact with the limit switch (2) at the rear of the Large Lever (4), the pneumatic cylinder is

stopped and the test force is removed.

4. INSTALLATION (See Parts Location Diagram on Page 8)

The tester should be installed in a dry, clean room without corrosive gases or large

amount of vibration. The base for the tester should be rigid and ﬂat and able to sup-

port weight of tester - 570 lbs. The general footprint dimensions are 9" wide x 21"

deep. The tester height is about 34". The tester's leveling feet should be installed and

the unit bolted to the work table with the hold-down hardware to prevent the tester

from tipping. A 2" hole must be made to accommodate the elevating screw. (Please

refer to the drawing below.) After positioning the tester should be leveled using adjust-

ments on the leveling feet.

Tester Footprint Drawing for bolting the tester to the work table.

The weight hanger (3) should be hung on the knife edge of the load lever (4) and the

weights added and rotated to different amounts so that the slots on the weights are

offset to prevent them from accidentally being knocked off the hanger. (See photo at

right) Place the hanger on the knife edge at the end of the large lever. Sufﬁcient space

should be maintained for adding and removing of the weights at the rear of the tester.

(See following section for hanging weights for proper load

IMPORTANT PRECAUTION: The area underneath the weights should be free from

obstruction that would prevent the weights from descending freely during the test cycle

- even possibly beyond the bottom of the tester. An obstruction could cause an incor-

rect test load or even cause the hanger to come off the load lever which could allow

the weights to fall.

If the Newage ﬂoor cabinet is used with the tester, the ridge in the back of the cabinet

is low enough that the weights will not hit as long as the operator uses a test specimen

prior to initiating a test - but a test without raising the part to the indenter could still al-

low the hanger to be dislodged.

The air regulator must be threaded into place on the side of the tester. It is shipped

with a 3/8" barb ﬁtting for connection to factory air. It is set for 60 psi. It extends to

the right of the tester as viewed by the operator, and care should be taken so that the

regulator is not exposed to damage during operation. The minimum air requirements

are 60 psi with .4 CFM.

The electrical power is normally 110V and 60Hz (except on units that have been adapt-

ed for other power supply requirements) The amperage requirement is very low - mil-

livolts for the electronics.

The indenter and an anvil must be installed - see following section

5. TEST SETUP and OPERATION

5.1 Setting up Indenter and Anvil

Select the proper indenter according to the desired load in

accordance with ASTM E-10. Indenters consist of a ball

holder, cap and ball. Clean any oil from the surface of the

ball and the ball holder before installing. Spread a little

Vaseline on the spherical indentation of the ball holder. In-

stall the tungsten carbide ball, and screw on the indenter cap.

The test is invalid if ball is loose, so inspect the ball indenter.

Screw the indenter into the main shaft. Then set the anvil (24

on the elevating screw (22).

5.2 Selection of Test Load

Place the Hanger (3) on the knife edge at the end of the large

lever for 187.5 kg test load. Add 62.5 kg weight for 250 kg

test load; add a 250 kg for 250 kg total load, add a 500 kg

weight for 1000 kg test load, and so on for the other test

loads up to 3000. 750 kg load may be set up with 187.5, 62.5

and 500 kg weights. Make certain each weight is oriented

so the slot is pointing in a different direction than the weight

underneath. This limits the ability of the weights to fall off the

tester if accidentally bumped or if a test cycle is initiated with-

out a test sample against the indenter

Selection of Common Test Loads (in kg.)

Add different weight combinations according to this diagram for desired load.

62.5 187.5 250 500 750 1000 1500 3000

500

187.5

62.5

250

500

187.5

62.5

250

500

187.5

62.5

250

500

187.5

62.5

187.5

62.5

250

62.5

187.5

no weights or

hanger

Load Lever

Hanger

Weight

slot

Showing weights with slots

oriented in different direc-

tions >

Ball

Cap

Holder

INDENTER

Indice

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