PCD HAMMER BIT INSERTS
AC Diamond dome inserts are two layered engineered products designed for high impact and wear resistant applications such as encountered in percussive drilling for oil and gas. Two layered structures have also found application in three cone rock bits. They are available in sizes suitable for both types of bits.
ROUND TOP DOME INSERTS - PREGRIND DIMENSIONS
|
PRODUCT
|
SIZE
|
D
|
L
|
R
|
DH
|
|
CODE
|
INCH
|
INCH
|
INCH
|
INCH
|
INCH
|
|
|
|
max
|
max
|
+/-.010
|
+/-.015
|
|
AC250
|
1/4
|
0.252
|
0.300
|
0.170
|
0.060
|
|
AC316
|
5/16
|
0.320
|
0.400
|
0.200
|
0.080
|
|
AC 375
|
3/8
|
0.380
|
0.500
|
0.195
|
0.155
|
|
AC440
|
7/16
|
0.450
|
0.750
|
0.218
|
0.185
|
|
AC500
|
1/2
|
0.525
|
0.750
|
0.255
|
0.220
|
|
AC560
|
9/16
|
0.570
|
0.750
|
0.280
|
0.250
|
|
AC630
|
5/8
|
0.635
|
0.750
|
0.325
|
0.245
|
|
AC690
|
11/16
|
0.690
|
0.750
|
0.345
|
0.268
|
|
AC7500
|
3/4
|
0.760
|
1.125
|
0.397
|
0.284
|
|
AC8750
|
7/8
|
0.780
|
1.125
|
0.445
|
0.369
|
|
AC1000
|
1
|
1.020
|
1.000
|
0.525
|
0.368
|
Tolerance: D +/-.0003, L +/-.002. Products can be finished ground to meet customer’s OD and length specifications.
Our ¾ inch, and 7/8 inch dome inserts have found successful application in geographical locations ranging from West and East Texas, New Mexico, Oklahoma, Arkansas, WV and NEUS regions.
Inserts are evaluated for their metallurgical features by microscopic examination of the section. Following micrographs show 1) the working layer integrity 2) the bonding between the working layer and the transition layer and 3) the interface integrity between transition layer and the carbide substrate. As can be seen in the following micrographs, the layers are homogenous and well bonded.
LAYER THICKNESS
AC Diamond Hammer bit inserts are characterized by highest thickness of first layer than found in any competitive product in the market place. Typical thickness for the first layer is in excess of .045 inch and transition layer of .030 inch.
EDM section of both ¾ inch and 7/8 inch insert.
MICROGRAPH OF CUTTING STRUCTURE
Scanning electron micrograph of outer working layer. The layer is more
than 90% by volume diamond followed by a specially engineered transition layer
that intimately bonds with the carbide substrate as shown below.
TRANSITION LAYER/ CARBIDE SUBSTRATE INTERFACE
QUALITY CONTROL AND IMPACT TESTING
Inserts are manufactured under strict guideline where all high pressure and high temperature components, raw materials for inserts are regulated. All batches of inserts are checked for the following:
1. Dye penetration to check presence of cracks
2. Thermal stability test
3. Drop Weight Test and
4. Impact Fatigue where inserts are subjected to impact at a rate of 20 hits per minute using a 5 Ton machine.
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