Online determination of the quality characteristics for punch riveting and clinching
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01B-005/02
B23P-019/00
F16B-015/00
F16B-019/08
출원번호
UP-0014512
(2008-01-15)
등록번호
US-7797126
(2010-10-04)
우선권정보
EP-07001042(2007-01-18)
발명자
/ 주소
Wenzel, Andreas
Kolac, Adnan
출원인 / 주소
Bollhoff Verbindungstechnik GmbH
대리인 / 주소
Seyfarth Shaw LLP
인용정보
피인용 횟수 :
3인용 특허 :
7
초록▼
The present invention discloses a method for the online determination of a bulge/upset dimension xST and rivet head end position K of a rivet 3 with a length L in a punch rivet process with the help of a moveable punch 10 and a rigid die 20. The path covered by the punch 10 and the force applied by
The present invention discloses a method for the online determination of a bulge/upset dimension xST and rivet head end position K of a rivet 3 with a length L in a punch rivet process with the help of a moveable punch 10 and a rigid die 20. The path covered by the punch 10 and the force applied by it are determined and evaluated online during the joining process. The quality characteristics of the joint connection are determined with the help of defined threshold values or a graphical evaluation of force/path data of the joining process.
대표청구항▼
We claim: 1. Online determination of bulge/upset dimension xST and rivet head end position KHS of a half-hollow punch rivet having a length L in a punch rivet process by a moveable punch and a die, comprising the following steps: a. capturing a path covered by a moveable punch during the punch rive
We claim: 1. Online determination of bulge/upset dimension xST and rivet head end position KHS of a half-hollow punch rivet having a length L in a punch rivet process by a moveable punch and a die, comprising the following steps: a. capturing a path covered by a moveable punch during the punch rivet process with the help of a travel sensor, b. capturing a force F applied to the half-hollow punch rivet by the moveable punch during the punch rivet process depending on the covered path, c. determining an attachment point x2 of the half-hollow punch rivet with punch to a joint part and a release point x4 from the captured force/path data, while the release point x4 identifies a release of the punch after the punch rivet process and d. calculating the rivet head end position KHS in accordance with KHS=x2+L−x4 and bulge/upset dimension xST in accordance with xST=x−x4, where x is the maximum distance between facing sides of punch and die. 2. Online determination according to claim 1, comprising the further steps: capturing the applied force with a force sensor and storing the force/path data in a data processing unit, in particular a computer. 3. Online determination according to claim 1, comprising the further step: identifying the attachment point x2 in the force/path data via a detection of a missing change in the captured moveable path despite a punch infeed, preferably a missing change over 1-20 increments during the punch infeed or identifying the attachment point x2 in the force/path data as the path, on which the captured force exceeds a certain threshold value, preferably a holding force of a set head or a hold-down device. 4. Online determination according to claim 1, comprising the further step: identifying the point x3 as the path, on which the maximum force Fmax of the punch is reached. 5. Online determination according to claim 1, comprising the further step: calculating a reference variable ΔxC for a machine rigidity in accordance with ΔxC=x3−x4, which specifies the flexibility of the constructive connection between the punch and the die, preferably a C frame. 6. Online determination according to claim 1, comprising the further steps: representing the captured force/path data in the form of a curve and identifying the point x4 through the creation of a tangent on the almost linearly running force/path data after a maximum force Fmax of the punch is reached so that a deviation of the force/path data by a specified value from the tangent gives point x4. 7. Online determination of embossing depth hd and rivet head end position KVS of a full punch rivet having a length L in a punch rivet process by a moveable punch and a die, comprising the following steps: a. capturing a path covered by a moveable punch during the punch rivet process with the help of a travel sensor, b. capturing a force F applied to the full punch rivet by the moveable punch during the punch rivet process depending on the covered path, c. determining an attachment point x2 of the full punch rivet with punch to a joint part and a release point x4 from the captured force/path data, while the release point x4 identifies a release of the punch after the punch rivet process and d. calculating the rivet head end position KVS in accordance with KVS=x2+L−x4 and the embossing depth hd in accordance with hd=t−[x−(x2+L)], where x is the maximum distance between facing sides of punch and die and t is a thickness of the joint parts. 8. Online determination of a base thickness tb in a clinch process by a moveable punch and a die, which has the following steps: a. capturing a path covered by a moveable punch during the clinch process with the help of a travel sensor, b. capturing a force F applied to a joint part by the moveable punch during the clinch process depending on the covered path, c. determining a release point x4 from the captured force/path data, which identifies a release of the punch after the clinch process and d. calculating the base thickness tb in accordance with tb=x−x4, where x is the maximum distance between facing sides of punch and die. 9. Online determination according to claim 8, comprising the further steps: capturing of the applied force by means of a force sensor and storing the force/path data in a data processing unit, in particular a computer. 10. Online determination according to claim 8, comprising the further step: identifying the point x3 as the path, on which the maximum force Fmax of the punch is reached. 11. Online determination according to claim 10, comprising the further step: calculating a reference variable Δxc for a machine compliance in accordance with Δxc=x3−x4, which specifies the flexibility of the constructive connection between the punch and the die, preferably a C frame. 12. Online determination according to claim 8, comprising the further steps: representing the captured force/path data in the form of a curve and identifying the point x4 through the creation of a tangent on the almost linearly running force/path data after a maximum force Fmax of the punch is reached so that a deviation of the force/path data by a specified value from the tangent gives point x4.
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이 특허에 인용된 특허 (7)
Kubanek Kurt ; Kellner Robert J., Control system and method for automatic fastening machines.
Mueller,Rudolf; Humpert,Richard, Functional element arrangement, functional element, auxiliary assembly element, assembled component and method for producing an assembled component.
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