JB 9968-1999 This standard is a revision of ZB J62 006.2-87 "Noise Limits for Forging Machinery - Noise Limits for Open Hydraulic Presses". This standard specifies the noise limits for the sound power level and sound pressure level of open presses. This standard applies to open fixed table presses and open tilting presses. This standard was first published in April 1987. JB 9968-1999 Noise Limits for Open Presses JB9968-1999 Standard Download Decompression Password: www.bzxz.net

KS25.120.0
Machinery Industry Standard of the People's Republic of China
JB9968—1999
Open Press
1999-05-14 Issued
Noise Limit
2000-01-01 Implementation
State Machinery Industry Bureau
3B9968-1999www.bzxz.net
This standard is a revision of ZBJ62006.2—B7 Forging Machine Noise Limit Open Press Noise Limit>. The technical content of this standard is consistent with that of ZBJ62006.2-87, and only the relevant provisions have been re-edited. This standard shall be implemented from the date of January 2000. This standard shall replace ZB362406.2-87 from the date of implementation. Appendix A of this standard is the appendix of the standard
This standard is proposed and managed by the National Technical Committee for Standardization of Pressing Machinery. The responsible unit for the chapter of this standard is Jinan Zhudao Pressing Machinery Research Institute. This standard was first issued in April 1987.
Machinery Industry Standard of the People's Republic of China
Noise Limits for Open Type Presses
This standard specifies the noise limits for open type presses and open type servo presses (hereinafter referred to as strict noise limits). 2 Reference Standards
JB9968-1999
Generation 7RJ62 0K6.2—87
The clauses contained in the following subtitles constitute the clauses of this standard by reference in this standard. When this standard is released, the version shown is valid. All standards may be revised. Parties that have difficulty in using this standard should consider the possibility of using the latest version of the following standards. JB3623—1984 Noise measurement method for press machinery 3 Noise limit value
3.1 The noise level of the press when running at no load should not be greater than the specified value in the table above
Nominal force
Noise factor L
>63-160
>160-210||tt ||>250-630
3.2 The sound pressure level L of the A-weighted sound pressure level of the press at the specified position during continuous idling operation shall not be greater than that specified in Table 2. Table 2
Nominal force
>63-160
>[60--250
>250-630
The pulse sound pressure level L of the press at the specified position for a single stroke of no-load shall not be less than that specified in Table 3. Table 3
Nominal force
Approved by the State Machinery Industry Bureau on May 14, 1999
2531.55-63
>63 -150
2000-01-01 Implementation
Measurement method
JE9968-1999
The force measurement method of this standard shall comply with the provisions of JB/13623: Instructions for use
The instructions for use of the standard are shown in Appendix A [Appendix to the standard] JB9968-1999
Appendix A
(Appendix to the standard)
Instructions for use of this standard
A1 All trial prototypes of new design or modified design, new products or processes produced in small batches, the first batch of press products produced after material change, and press products undergoing quality grade assessment and performance tests shall all be tested for noise sound pressure level and disassembled for testing of power output.
A2 For press products produced in normal batches, only the noise output sound pressure level may be measured during factory inspection.
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