This standard specifies the recommended procedures for life comparison test and quality acceptance of standard straight shank and taper shank high-speed steel twist drills. This standard is applicable to laboratories and actual production. In order to ensure the consistency and comparability of test results, this standard makes unified provisions for the test twist drills, test blanks, cutting fluids and other factors to ensure the consistency of test conditions and the processing methods of test data. JB/T 50189-1999 Twist Drill Life Test Method JB/T50189-1999 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T:50189-1999
Twist Drill
Life Test Method
(Internal Use)
Published on 1999-06-09
State Machinery Industry Bureau
200-(1-01 Implementation
JBT501B9—1999
This standard is a revision of IB/7.256—85 Twist Life Test Method 3. The technical content of this standard is the same as IB/7.256—95, and it has only been re-edited according to relevant regulations. This standard will replace IB/7.256—85 from the date of implementation. Appendix A and Appendix B of this standard are both standard appendices. Appendix C and Appendix D of this standard are both indicative appendices. This standard was proposed and managed by the National Technical Committee for Standardization of the People's Republic of China. The responsible unit of this standard is: Ministry of Education and Research Institute. The founders of this standard are: Fang Guru, Zou Xinxi, Fan Hua
Machinery Industry Standard of the People's Republic of China Standard
Twist drill
Life test method
(internal use)
IB/T501891999
Generation 7.25—5
This standard specifies the recommended procedures for the life comparison test and quality acceptance of standard straight tree, high-strength steel twist drills. This standard is applicable to laboratories and actual production. In order to ensure the consistency and comparability of the test results, the technical standard makes unified provisions for the twist drills used in the test, the control rules, the various factors and the handling methods of the test data to ensure the consistency of the test conditions. 2 Referenced standards
The provisions contained in the following standards constitute the basis of this standard through reference in this standard. Standard text. This standard is published, all minor editions shall be valid, all existing standards will be revised, and all parties using and standardizing shall explore the possibility of using the latest version of the following standards. GH/T1438.1-1996 Straight shank twist drills Part 1: Types and sizes of Morse twist drills GHT3077-1988
Technical conditions for alloy structural steels
GB/T6135.3-1W6 Straight shank twist drills Part 3: Types and sizes of straight shank twist drills 3.3 Twist drills for testing
3.1 The test sample is in accordance with the provisions of GB/T6135.3 and GH/T1438.1. 3.2 It is convenient for comparison and is recommended to use The representative specifications of twist drills are 5mm and 8mm for straight twist drills and 20mm for twist drills with a handle. If other specifications are used for testing, the cutting tool and life should be re-determined. When non-representative specifications are used for quality inspection: their cutting and life should be inspected by the industry testing center. 3.3 Twist drills used for industry quality assessment or similar tests should be selected from the finished products of batches of large-scale products of specified types. 3.4 Representative twist drills for inspection should be selected, and their geometric parameters before cutting should be specified in Table 1. Table 1
Geometric Items H
Cutting Edge
Cross Blade Bevel
3.5 Installation of Twist Drill
Handle Twist Drill
4* 20
118±39
50* ± 30
Twist drill
118* +30
55~ ±1°
3.5.1 The straight twist drill shall be installed on a drill head or spring chuck that meets the requirements of the corresponding precision standards: the taper sleeve used in the twist drill table shall also meet the requirements of the standards. 3.5.? When the twist drill is installed, the extended length of the working part is as follows: The distance between the pin tip and the drill chuck of the straight twist drill is in accordance with the provisions of Figure 1) and Table 2: Approved by the State Machinery Industry Bureau on June 9, 1999 and implemented on January 1, 2000
JB/T50189-1999
h The maximum distance between the tip and the spindle box of the 20mm diameter conical twist drill is 380mm, see, 1: Special disease
Twist drill
God out of long concubine||tt ||After the twist drill is clamped, when the spindle is rotated, the radial movement at any point on the cutting edge should not exceed the limit in Table 3. Table 3
Twist drill diameter
Radial dynamic measurement
Test test
4.1 Test test is as follows: Www.bzxZ.net
Bearing steel Gt15, its technical requirements meet the requirements of Appendix (Appendix of the standard) 6 Alloy structural steel 40Cr, the technical requirements shall meet the requirements of GB/37: 4.2 The test shall meet the requirements of GB/37.
4.3 The test does not need to be fully processed, and its hardness range is: GCr:5 is 26~280HB. 40Cr is 200~220HB, the average sphericity of the national first-class fast test is not more than 15HB, and only one fire is allowed: the material selection in one test is the same, and the test heat treatment process is carried out according to the standard of 2A. 4.4 Test hardness measurement method JB/T50189—1999 4.4.1 In the batch test, select 1~2 fast test rings as specified in Figure 3a and cut them, and carry out single-row pressing to make detailed records, 4.2 All test rings are measured at three points on the end face according to the radius of 3 equally divided. The value is within the specified range and the hardness range value is marked according to the measured value. See Figure 3]
5 Cutting fluid
5. The recommended emulsified concentration is 10% mechanical punch
sodium carbonate
sulfonate
5.2 The concentration of the test fluid is generally within 3%-5%: 5.3 The flow path of the cutting roller is not below BL/m
Cutting conditions
sodium cyclopentane
ethanol
The average speed is 25m/mn, and the representative specifications of the twist drill are shown in Table 4. The relative diameter and drilling depth are shown in Table 4: The type of the hole is a non-through hole: Table 4
Twist drill height
1 sleeve rotation three
Drilling depth
6.3 The machine used for the test is a vertical machine tool that meets the accuracy standard or other vertical machine tools that meet the test requirements. Stop test standard
1R/T50189—1999
In aluminum cutting, when the twist drill has one of the following conditions, the test should be stopped: "heavy sound" appears in three consecutive holes, or the machine tool produces special vibrations: b) wear position of the rear of the secret twist drill: 0.8mm for the henry handle twist drill, 1mm for the lithium handle twist drill c) wear of the blade of the twist drill to the axis line: 1.5mm for the car handle twist drill: 2mm for the catalytic handle twist drill: 1mm for the real handle twist drill, 1.5mm for the chain handle twist drill; e! The twist drill is broken in the base. Test steps and requirements
8.1 Before the test, the twist drills used for the test should be numbered and fully inspected. 8.2 Check the composition, degree, size and required number of plates of the bending test to see if they meet the requirements. 8.3 Check the machine tools, instruments and auxiliary equipment used in the experiment, and the certificates of qualification and the main precision performance test records. The above test data should be supplemented and the records should be submitted:
B.4 Before the test, the actual speed and feed of the machine tool should be tested separately, and then the record report should be made: 8.5 The test supervisor must meet the test requirements of the month and submit the test process specified in this standard. &6 The test results should be filled in according to the unified form. The form is shown in Appendix D (Reminder Appendix). The situation during the test should be recorded. If necessary, a preliminary test can be made. 8.8 When testing large-size drill bits, the tool will automatically feed after the cut is completed. 9. Calculation of data
Before calculating the data, first check whether the test record meets the requirements, and then make a statistical analysis. During the entire test process, if any abnormal phenomenon occurs, the cause should be found out immediately and eliminated, otherwise the test result will be invalid. 9.2 If too few twist drills are used for the survival test, it will affect the reliability of the test results. At least 10 twist drills should be taken for the test.
9.3 Record and draw
The twist drill loss value obtained during the test can be expressed in several forms, such as effective averaging time, total cutting depth, plus 1 number, etc. The solution is intuitive and simple. It is more practical to use the number of processed holes and the loss value of the hemp drill as the coordinates: see Figure 1: 5 and Figure 1 on the right. Figure 4. The number of holes plotted against the wear value of each twist drill in a group of tests. Test results. JB/T50189—1999. Figure 5. The number of holes plotted against the average loss of the hemp drill in a group of tests. 4. Statistical analysis. The maximum and minimum values ​​of the twist drill loss in a group of tests. The calculation method of the twist drill test. The recommended method for assessing the performance of the twist drill. The total algorithm is as follows: 9.4.! The average life span of the group of diamonds under the condition of the test is obtained. The sum of the cumulative results of each test (that is, the average value obtained by dividing the number of tests) is expressed as x
, as shown in the formula, x
15% of the average value obtained by the root of the light is taken as the extreme value of the test results of the batch of special diamonds. The test results that are not related to the extreme value are considered unreliable. After signing, the 10% value is replaced by the average life span of the batch of diamonds: the average value of the life span of the batch of diamonds is calculated as the half-mean value of the batch of diamonds.
42 Among the 10 diamonds tested, the best 9 (including the one with the lowest life span) and the average energy consumption per gram of diamonds are 20 %. If the condition is not met, it is considered that the dispersion of the batch of state flowers does not meet the requirements. Gcrls
Preheating temperature
Preheating time
Heating temperature
Heating time
Humidity
Insulation time
A240cr
Preheating humidity
Heat time
Heating temperature
Heating temperature
Cooling medium
Insulation time
Humidity
Insulation time|| tt||650--7009
TR/T50189-1999
Appendix A
【Appendix to the standard】
GCr15 and 40Cr test failure also promote the quenching and tempering process 0.5min/mm
840-Bsa%
0Sttin/mm
10Jiang Hui
carried out in the salt furnace
12-150minm
650-700%℃
n5minmm|| tt||85-R60
0.5min/mm
Niter water melting and fire extraction, oil cooling
1.s-2s/mm
730-750
120.-150min
B1 Chemical composition according to table 1
3.95.-1.05
Degree is! 79-207
JB/T50189-1999
Attached beam B
(Appendix of the standard)
GCT15 Technical requirements of
Internal quality requirements meet my requirements
Customer experience
One bottom is continuous
High-power non-gold two-branch impurity
12(1--1 05
Point-shaped constant consideration
Cue:0 25
Ni+u=0.5c:
Network spheroidizing material Xing-shaped magnetic material
(I data calculation example see table I
Grab the second fee
The average male
1%
179 x15%
139.8×2%
JB/T50189—1999
Appendix C
【Reminders】
Data calculation example
Test station crack
Calculation table
JB/T50189-1999
Appendix D
【Reminders】
Test table format
This table specifies the table D1 for test pieces for use by manufacturers: Table D2 is for summary use by research institutes and other departments D2 The auxiliary matching of the clothing grid meets the requirements D3 Size 263×372, mm JB/T 50189 - 1999
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