Method for manufacturing a nozzle piston, production method for a damper, nozzle piston, damper, production plant for producing a damper

Patent metadata

Field	Value
Publication number	US-11353083-B2
Application number	US-201816486219-A
Country	US
Kind code	B2
Filing date	Feb 14, 2018
Priority date	Feb 24, 2017
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

Provided is a method for the production of a nozzle piston for arrangement in a damping space of a damper, which contains a damping fluid, wherein the piston divides the damping space into a first fluid chamber and a second fluid chamber. Also provided is a production method with the method according to the invention for a damper. Also provided is a nozzle piston for arrangement in a damping space of a damper, which contains a damping fluid, wherein the nozzle piston can be obtained by means of ultra-short pulse lasering of the recess from a piston blank. Also provided is a damper having a nozzle piston according to the invention. Also provided is a production plant for the production of a damper having at least one ultra-short pulse laser station for machining a piston blank for the damper by ultra-short pulse lasering.

First claim

The invention claimed is:

1. A method for producing a damper, the method comprising at least the following steps:
a. producing a piston blank,
b. introducing at least one recess into the piston blank by ultrashort pulse lasering, wherein the at least one recess, upon arrangement of a nozzle piston in a damper chamber, defines a nozzle for a damping fluid for adapting the flow impedance for the damping fluid between a first fluid chamber and a second fluid chamber,
c. installing the nozzle piston in the damper chamber of the damper, wherein the nozzle piston is guided along a longitudinal axis of the damper chamber and divides the damper chamber into the first fluid chamber and the second fluid chamber,
d. testing the nozzle piston, with respect to a force-velocity characteristic of the damper containing the nozzle piston, and
e. controlling the step of introducing the at least one recess into a subsequently produced piston blank based on a result of the step of testing of the nozzle piston.

2. The method according to claim 1 , wherein the introduction by ultrashort pulse lasering:
a. is performed at a local piston temperature in a removal region of the nozzle piston, which piston temperature is above a sublimation temperature of a piston base material; and/or
b. is performed at a regional piston temperature in a piston region adjoining a removal region of the nozzle piston, which is below a deformation temperature of a piston base material and corresponds to an ambient temperature of an environment of the nozzle piston; and/or
c. is performed using a laser wavelength in the near infrared spectral range between 0.8 μm and 3.0 μm; and/or
d. is performed using a pulse frequency between 200 kHz and 2000 kHz; and/or
e. is performed using a pulse duration of less than 100 picoseconds; and/or
f. is performed using a pulse energy of less than 500 mJ; and/or
g. is performed using a laser spot diameter of between 25 μm and 500 μm, and/or
h. is performed in a controlled atmosphere.

3. The method according to claim 1 , wherein at least one of the following steps is performed:
a. collecting thermal properties of the nozzle piston and/or thermal coupling of the nozzle piston to an environment of the nozzle piston; and/or
b. selecting laser parameters based on thermal characteristics of the nozzle piston and/or thermal coupling of the nozzle piston to an environment of the nozzle piston; and/or
c. attaching at least one cover element adjacent to the recess; and/or
d. documenting a result of a testing of the nozzle piston on the nozzle piston; and/or
e. labeling of the nozzle piston and/or the damper by ultrashort pulse lasering; and/or
f. hardening a surface of the nozzle piston by ultrashort pulse lasering, and/or
g. coating a surface of the nozzle piston.

4. A production plant for producing a damper, with a production method according to claim 1 , including
a. at least one ultrashort pulse laser station for treatment of a piston blank for the damper by ultrashort pulse lasering,
b. at least one control unit for controlling the ultrashort pulse laser station,
c. at least one testing station downstream of the ultrashort pulse laser station in the course of production for testing the nozzle piston and/or the damper, wherein the at least one testing station comprises a transmitting unit, for transmitting results of the testing to the at least one control unit, and
d. at least one installation station downstream in the course of production of the ultrashort pulse laser station for installation of the nozzle piston in the damper.

5. The production plant according to claim 4 , wherein the ultrashort pulse laser station:
a. is assigned to a plurality of production lines of the production plant, wherein the ultrashort pulse laser station is formed mobile and/or the production plant comprises a transport system for supplying piston blanks from a plurality of production lines to the ultrashort pulse laser station; and/or
b. is integrated into a transport system for transporting piston blanks; and/or
c. comprises a laser scanner.

6. The production plant according to claim 4 , further comprising:
a. at least one production station upstream of the ultrashort pulse laser station in the course of production for producing a piston blank from a piston base material; and/or
b. at least one control unit for controlling a production station and/or a transport system and/or for documenting production parameters, of the ultrashort pulse laser station and/or a production station, and/or test results of a testing station.

7. The method according to claim 2 , wherein the introduction by ultrashort pulse lasering:
a. is performed using a laser wavelength in the IR-A range between 0.8 μm and 1.4 μm; and/or
b. is performed using a pulse frequency between 500 kHz and 1000 kHz; and/or
c. is performed using a pulse duration of less than 10 picoseconds; and/or
d. is performed using a pulse energy of less than 200 mJ; and/or
e. is performed using a laser spot diameter of between 50 μm and 150 μm.

8. The method according to claim 7 , wherein the introduction by ultrashort pulse lasering:
a. is performed using a laser wavelength in the IR-A range at 1.0 μm; and/or
b. is performed using a pulse frequency at 800 kHz; and/or
c. is performed using a pulse duration of 0.8 picoseconds; and/or
d. is performed using a laser spot diameter at 75 μm.

Assignees

• Stabilus Gmbh

Inventors

• Löhken Lars
• Müller Markus
• Piroth Raphael
• Probst Ulrich

Classifications

• B23K26/0869

  Devices involving movement of the laser head in at least one axial direction · CPC title

• F16F2226/023

  by laser or similar treatment by rays · CPC title

• B23K26/364

  for making a groove or trench, e.g. for scribing a break initiation groove · CPC title

• F16F9/19

  with a single cylinder {and of single-tube type} · CPC title

• F16F9/3214 Primary

  of pistons (F16F9/0227 and F16F9/36 take precedence; throttling passages in or on piston body F16F9/3405) · CPC title