Chapter 6: Fastening Instructions
Chapter 6: Fastening Instructions 6.1 User Console Version A3.53 Fastening Control Methods The AFC1200 System is user programmable to select from three different fastening methods, referred to as Torque Control, Angle Control, and Yield Control methods. Each method can be configured to perform the fastening in 1 to 4 incremental steps. 6.1.1 Torque Control Method In Torque Control method, fastening is performed based upon attaining a desired torque value.
Chapter 6: Fastening Instructions User Console Version A3.53 { Two-Step Fastening P After presetting the Fastening sequence (SET SEQUENCE section 7.5) to perform a two-step fastening, the System fastening parameters (PARAMETER SET Section 7.1) must be configured according to the Engineered fastening specification. P Two-step fastening will be used primarily for joints that have a requirement to synchronize with another spindle during the final stage of the rundown.
Chapter 6: Fastening Instructions User Console Version A3.53 P After presetting the fastening sequence (SET SEQUENCE Section 7.5) to perform a three-step fastening, the System fastening parameters (PARAMETER SET Section 7.1) must be configured according to the Engineered fastening specification. P Three-step fastening will be used primarily for joints that have a requirement to synchronize with another spindle during the incremental stages of the rundown to crush/compress a gasket or grommet.
Chapter 6: Fastening Instructions User Console Version A3.53 P After presetting the fastening sequence (SET SEQUENCE section 7.5) to perform a four-step fastening, the System fastening parameters (PARAMETER SET Section 7.1) must be configured according to the Engineered fastening specification. P Four-step fastening will be used primarily for joints that have a requirement to synchronize with another spindle during the incremental stages of the rundown to crush/compress a gasket or grommet.
Chapter 6: Fastening Instructions User Console Version A3.53 In Angle Control method, fastening is performed based upon attaining a desired torque value and then rotating the fastener a specified number of degrees. Fastening can be performed in from 1 to 4 incremental steps that will successively secure the fastener to a specified torque or angle value before attaining the final number of degrees of rotation. Angle Control method is primarily used when greater control of clamp load is required.
Chapter 6: Fastening Instructions User Console Version A3.53 P After presetting the fastening sequence (SET SEQUENCE Section 7.5) to perform a two-step fastening, the System fastening parameters (PARAMETER SET Section 7.1) must be configured according to the Engineered fastening specification. P Two-step fastening will be used primarily for joints that have a requirement to synchronize with another spindle during the final stage of the rundown.
Chapter 6: Fastening Instructions User Console Version A3.53 P After presetting the fastening sequence (SET SEQUENCE Section 7.5) to perform a three-step fastening, the System fastening parameters (PARAMETER SET Section 7.1) must be configured according to the Engineered fastening specification. P Three-step fastening will be used primarily for joints that have a requirement to synchronize with another spindle during the incremental stages of the rundown to crush/compress a gasket or grommet.
Chapter 6: Fastening Instructions User Console Version A3.53 P After presetting the fastening sequence (SET SEQUENCE Section 7.5) to perform a four-step fastening, the System fastening parameters (PARAMETER SET Section 7.1) must be configured according to the Engineered fastening specification. P Four-step fastening will be used primarily for joints that have a requirement to synchronize with another spindle during the incremental stages of the rundown to crush/compress a gasket or grommet.
Chapter 6: Fastening Instructions User Console Version A3.53 6.1.3 Yield Control Method (U.S.A. PATENT No. 4,894,767) In Yield Control method, fastening is performed based upon attaining a desired permanent elongation or bolt stretch. Fastening can be performed in from 1 to 4 incremental steps that will successively secure the fastener to a specified torque or angle value before attaining the final permanent elongation or bolt stretch.
Chapter 6: Fastening Instructions User Console Version A3.53 P After presetting the fastening sequence (SET SEQUENCE Section 7.5) to perform the desired number of steps, the System fastening parameters (PARAMETER SET Section 7.1) must be configured according to the Engineered fastening specification. P Multiple-step fastening will be performed according to the Torque and Angle Control method procedures.
Chapter 6: Fastening Instructions User Console Version A3.53 6.1.3.2 Area Yield Method The Area Yield Method will be the primary controlling method on fasteners that do not have a clearly definable yield point. These fasteners will exhibit a gradual change in torque rate as the fastener is elongated. This calculation of the elongation area (EA) allows the system to simulate the fastener as if it had displayed a clearly defined yield point.
Chapter 6: Fastening Instructions User Console Version A3.53 P For a standard two-step operation, the System will fasten to 1st TORQUE/ANGLE during the specified 1ST STEP time. Once either SPEED CHANGE TORQUE or 1st TORQUE/ANGLE is reached, the System will switch to the specified TORQUE SPEED (Section 6.3). When all fasteners have reached 1st TORQUE/ANGLE, the spindles will synchronize and then fasten simultaneously until the desired bolt stretch has been reached, within the specified FINAL STEP time.
Chapter 6: Fastening Instructions 6.2 User Console Version A3.53 Monitoring Functions The AFC1200 System is user programmable to select and set the monitoring limits for torque, angle, time and three independent torque rate stages. Torque rate monitoring may be configured to perform two different methods of calculations dependent upon the characteristics of the joint. 6.2.1 Torque Monitoring Torque Monitoring is a continuous process whenever the System is operating.
Chapter 6: Fastening Instructions User Console Version A3.53 6.2.3 Point-to-Point Torque Rate Monitoring The AFC1200 System is capable of performing three independent torque rate calculations using two different procedures for calculating the rate value. The first of these procedures is the Point-to-Point method. This method performs the calculation based upon completing a step of the process, and then calculating the rate for the full duration of that step.
Chapter 6: Fastening Instructions User Console Version A3.53 6.2.4 Integrated Torque Rate Method The AFC1200 System is capable of performing three independent torque rate calculations using two different procedures for calculating the rate value. The second of these procedures is the Integrated Method. The Incremental Torque Rate Method is enabled whenever a value (3~199 odd number) is entered for the INCREMENT ANGLE on the SET PARAMETER (FASTENING) screen.
Chapter 6: Fastening Instructions User Console Version A3.53 For all control operations, the High and Low Torque Rate limits are set by determining the acceptable limits from a study of known good and bad assemblies. TORQUE INTEGRATED TORQUE RATE STD. 3RD RATE HIGH 3 3RD RATE LOW CROSSOVER RATE 2 3 TORQUERATE3 2NDRATE HIGH 2 TORQUERATE2 2 1 TORQUERATE1 1ST RATE HIGH 2ND RATE LOW 1st TORQUE / ANGLE 1 THRESHOLD 1 TORQUE 1ST RATE LOW ANGLE FIG.
Chapter 6: Fastening Instructions 6.3 User Console Version A3.53 Speed Functions The AFC1200 System is user-programmable for operations involving multiple speed settings. The use of multiple speeds during the fastening process aids in socket engagement, achieving cycle time, and controlling the applied torque during all stages.
Chapter 6: Fastening Instructions User Console Version A3.53 FUNCTION RECOMMENDATION OFFSET CHECK SPEED SEt to the same value as the final torque speed. WHen the offset check is enabled in the sequence program this speed will replace the initial speed preset. INITIAL TIME SET to a duration which will provide sufficient time for the socket to fastener engagement. MAy be set in either seconds or revolutions. INITIAL SPEED SET to the rpm which will allow for easy socket to fastener engagement.
Chapter 6: Fastening Instructions 6.4 User Console Version A3.53 Reverse Functions The AFC1200 System is capable of reverse operations using three different control methods. There are three independent reverse presetting options to choose from when performing these operations. The following list details which items may be used under which conditions: P Manual switch located on the front of the Main Unit (NO. 1 REVERSE) P PLC REVERSE input signal (NO. 1 REVERSE) P Fastening Sequence program (NO.
Chapter 6: Fastening Instructions 6.5 User Console Version A3.53 Torque Recovery The Torque Recovery function is used when the potential for joint relaxation and interaction exists. Under this control method, the fasteners are secured to final torque, and then held at a programmed value for a programmed period of time. FEC INC. personnel have control of the value and duration of the Torque Recovery function. NOTE: This method of fastening must not be used without the assistance of FEC INC. personnel.
Chapter 6: Fastening Instructions User Console Version A3.
