WO2009088562A2 - Method for determining the optimal insertion force of a fastener press - Google Patents
Method for determining the optimal insertion force of a fastener press Download PDFInfo
- Publication number
- WO2009088562A2 WO2009088562A2 PCT/US2008/082639 US2008082639W WO2009088562A2 WO 2009088562 A2 WO2009088562 A2 WO 2009088562A2 US 2008082639 W US2008082639 W US 2008082639W WO 2009088562 A2 WO2009088562 A2 WO 2009088562A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- force
- fastener
- slope
- host material
- velocity
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
Definitions
- This invention relates to a fastener press which utilizes electric servo motors for precise ram position control. More specifically, it relates to an automated system for determining the optimal insertion force for a given installation of a clinch fastener.
- Clinch fasteners have two primary features related to their retention in the host material, usually metal sheets. They are displacers and undercuts. Installing clinch fasteners into host materials is a process of pressing the fasteners' displacers into the host material. The displaced volume of the host material is then by default pushed into the undercut of the clinch fastener thus retaining it in the sheet.
- Pressing clinch fasteners into host materials requires different forces during the pressing process due to the geometry of the fasteners' displacers. During the pressing process the force required varies but when seated properly there is an instant and abrupt rise in the force required to continue pressing. If the force is increased beyond the point of proper insertion, over-insertion results and the effect is usually a distortion of the clinch fastener and/or the host material. If the pressing force is insufficient then under-installing is the result and typically the clinch fasteners' retention values are diminished.
- selecting the correct insertion force for a clinch fastener is limited to two options.
- the first option is selecting a force from a table of ferees grouped into categories of fastener size, type, and the type of host material the fastener is to be inserted into. These categories are broad generalizations and only provide an estimated force. This estimated force is considered a baseline to work from and the ideal force is then arrived at by trial and error.
- the trial and error method consists of pressing to a pre-chosen force and then adjusting that force on subsequent insertions to determine the optimal force.
- the second method of determining the proper insertion force is to bring the ram into contact with a properly positioned fastener on the host sheet and then incrementally increasing the force until the desired insertion results are achieved.
- the present invention has been devised which eliminates the need for categorized forces and also eliminates the need for trial and error to determine the proper insertion force.
- data about an insertion is monitored during the insertion process.
- the optimal insertion force is determined during a preparatory setup operation in which a sample fastener is installed by a fastener press as specified.
- a fastener press is, for example, a Pemserter Series 3000 manufactured and sold by Penn Engineering and Manufacturing Corp. as shown in Figure 1 which is a ram press 4 that includes a c-shaped frame 1 that supports an anvil 2 that is reciprocally impacted by ram 3.
- the Applicant has invented a method for determining the optimal insertion force for installing a clinch-type fastener into a host material comprising the steps of selecting a sample fastener from a work batch of fasteners all of the same type and then monitoring the time, insertion velocity and insertion force of the fastener into a host material during a setup operation of the press.
- Setup operation includes selecting an insertion velocity to maintain throughout the installation process regardless of the force required.
- the setup operation is carried out measuring the force required during the installation process to maintain the selected insertion velocity.
- the insertion force is compared to the elapsed insertion time to obtain a force slope. The point at which the force slope abruptly increases is recorded and then used as the installation force of the other fasteners in the work batch.
- Figure 1 is a front left isometric view of a ram press utilizing the invention.
- Figures 2a and 2b are graphs showing the force and velocity insertion profiles which utilize the invention of the preferred embodiment.
- Figures 3a and 3b are force and velocity insertion profiles of an alternate fastener/host material combination.
- Figures 4a and 4b are graphs of the force and velocity insertion profiles of a second alternate fastener/host material combination. DESCRIPTION OF THE PREFERRED EMBODIMENT
- a setup installation is performed during which the desired fastener is inserted into the host panel.
- the setup installation is carried out at slower than normal work speed so that the proper insertion force value can be more precisely determined.
- the optimal insertion force for subsequent fastener installations of a work batch is determined during this installation as follows:
- the insertion velocity is predetermined and then monitored during the insertion process to assure that the velocity is maintained regardless of the force required to maintain the velocity.
- this force slope is monitored and a mathematical algorithm is applied to the data points as they are being monitored.
- a rolling slope average is obtained by averaging the most current 3 force values then also averaging the 6 th , 7 th and 8 th values. Once the average is calculated, they are treated as two points then the difference is found and used to calculate a running slope average. This process eliminates or masks data anomalies thus generating a curve that can be interpreted without distortions.
- a graph depicts one way of installing a clinch nut. It shows force over time.
- the X axis is milliseconds X lO.
- the Y axis indicates the voltage readout of the strain gauge which equates to force.
- the data points indicate the strain gage voltage at a given time during the pressing operation. Depicted are extraneous points from the mean.
- the rolling average smooths out the curve and eliminates erroneous interpretations of the data.
- the rolling average is a basic mathematical convention used at this time. More sophisticated formulas can be used.
- the first part of the graph shows a rise in force as the clinch features are being pressed into the host material.
- the force curve flattens out. This is due to the geometry of the displacers and the initial deformation of the host material. From 350 milliseconds to approximately 2,150 milliseconds the flat curve represents a fairly constant force is needed to press the displacers into the host material as initial deformation has already occurred and the displacer geometry in now constant.
- the force curve slopes up distinctly. This corresponds to the fastener being seated.
- the process is complete as 5 consecutive averaged points have been recorded on this steep slope.
- Figure 2b is a graph associated with Figure 2a and is recorded simultaneously with Figure 2a.
- Figure 2b shows the velocity of the press ram.
- the X axis indicates milliseconds X lO and the Y axis indicates encoder ticks which equate to position.
- This graph shows that the ram was moving at a constant velocity during the pressing cycle. This information is critical to the inventive process. If the velocity had not been constant then the interpretation of Figure 2a would be invalid as fluctuations in velocity would have an impact on the force required during the pressing operation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Presses (AREA)
- Automatic Assembly (AREA)
- Forging (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08869502.8A EP2205379B1 (en) | 2007-09-14 | 2008-11-06 | Method for determining the optimal insertion force of a fastener press |
MX2010002816A MX2010002816A (en) | 2007-09-14 | 2008-11-06 | Method for determining the optimal insertion force of a fastener press. |
JP2010525118A JP5377495B2 (en) | 2007-09-14 | 2008-11-06 | How to determine the optimum insertion force of a fastener press |
CA2698473A CA2698473C (en) | 2007-09-14 | 2008-11-06 | Method for determining the optimal insertion force of a fastener press |
CN200880107260.1A CN101801559B (en) | 2007-09-14 | 2008-11-06 | Method for determining the optimal insertion force of a fastener press |
PL08869502T PL2205379T3 (en) | 2007-09-14 | 2008-11-06 | Method for determining the optimal insertion force of a fastener press |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US97243607P | 2007-09-14 | 2007-09-14 | |
US60/972,436 | 2007-09-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009088562A2 true WO2009088562A2 (en) | 2009-07-16 |
WO2009088562A3 WO2009088562A3 (en) | 2009-09-17 |
Family
ID=40853661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2008/082639 WO2009088562A2 (en) | 2007-09-14 | 2008-11-06 | Method for determining the optimal insertion force of a fastener press |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP2205379B1 (en) |
JP (1) | JP5377495B2 (en) |
CN (1) | CN101801559B (en) |
CA (1) | CA2698473C (en) |
MX (1) | MX2010002816A (en) |
MY (1) | MY153348A (en) |
PL (1) | PL2205379T3 (en) |
WO (1) | WO2009088562A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6257971B2 (en) * | 2013-09-09 | 2018-01-10 | 蛇の目ミシン工業株式会社 | Electric press, judgment method and program |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS632534U (en) * | 1986-06-20 | 1988-01-09 | ||
US5661887A (en) * | 1995-04-20 | 1997-09-02 | Emhart Inc. | Blind rivet set verification system and method |
DE19731222C5 (en) * | 1997-07-21 | 2016-10-13 | Newfrey Llc | Method for forming a punched rivet connection and a joining device for punch rivets |
US6067696A (en) * | 1998-04-08 | 2000-05-30 | Dimitrios G. Cecil | Quality control system for a clinching station |
US6325584B1 (en) * | 1999-03-30 | 2001-12-04 | Richard Bergner Gmbh | Self-piercing rivet |
JP4202065B2 (en) * | 2001-07-27 | 2008-12-24 | トヨタ自動車株式会社 | Rivet quality monitoring device, rivet quality monitoring method and rivet quality monitoring program |
CN100595001C (en) * | 2002-01-21 | 2010-03-24 | Ms仪器制造有限公司 | Mounting tool, head cover and method for detecting the mounting process |
GB2390833B (en) * | 2002-07-18 | 2005-09-14 | Emhart Llc | Method and apparatus for monitoring blind fastener setting |
JP2005131777A (en) * | 2003-10-31 | 2005-05-26 | Hitachi Hybrid Network Co Ltd | Press-fit-caulking apparatus |
GB2430174B (en) * | 2005-09-16 | 2008-04-30 | Textron Fastening Syst Ltd | Monitoring system for fastener placing tool |
-
2008
- 2008-11-06 WO PCT/US2008/082639 patent/WO2009088562A2/en active Application Filing
- 2008-11-06 MY MYPI2010001091A patent/MY153348A/en unknown
- 2008-11-06 MX MX2010002816A patent/MX2010002816A/en active IP Right Grant
- 2008-11-06 CN CN200880107260.1A patent/CN101801559B/en not_active Expired - Fee Related
- 2008-11-06 EP EP08869502.8A patent/EP2205379B1/en not_active Not-in-force
- 2008-11-06 PL PL08869502T patent/PL2205379T3/en unknown
- 2008-11-06 CA CA2698473A patent/CA2698473C/en not_active Expired - Fee Related
- 2008-11-06 JP JP2010525118A patent/JP5377495B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of EP2205379A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN101801559B (en) | 2014-04-16 |
CN101801559A (en) | 2010-08-11 |
EP2205379A4 (en) | 2012-11-28 |
MY153348A (en) | 2015-01-29 |
EP2205379B1 (en) | 2013-10-09 |
MX2010002816A (en) | 2012-09-25 |
PL2205379T3 (en) | 2014-03-31 |
CA2698473A1 (en) | 2009-07-16 |
EP2205379A2 (en) | 2010-07-14 |
WO2009088562A3 (en) | 2009-09-17 |
JP2012507403A (en) | 2012-03-29 |
JP5377495B2 (en) | 2013-12-25 |
CA2698473C (en) | 2015-06-30 |
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