Method for monitoring quality of hot stamped components

Patent metadata

Field	Value
Publication number	US-11554404-B2
Application number	US-202016819494-A
Country	US
Kind code	B2
Filing date	Mar 16, 2020
Priority date	Feb 19, 2016
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

A controller alters a cycle time of a die arrangement, configured to hot stamp metal into components and having an active cooling system, based on an amount of heat transferred from the components to the active cooling system such that a grain structure of the components transitions from an austenitic state to a martensitic state.

First claim

What is claimed is:

1. A hot stamping system comprising:
a controller (i) in digital communication with a die arrangement that is configured to hot stamp metal into components and having an active cooling system, and (ii) programmed to alter a cycle time of the die arrangement based on an amount of heat (Q E ) that is transferred from the components to the active cooling system and derived from a plurality of parameters indicative of a change in a measured temperature and at least one of a component material specification, weight, geometry, thickness, heat capacity, or latent heat such that the cycle time is decreased responsive to the amount exceeding a threshold amount (Q T ) that is indicative of a grain structure of the components transition from an austenitic state to a martensitic state.

2. The system of claim 1 , wherein the controller is further programmed to alter the cycle time such that the cycle time is increased responsive to the amount being less than the threshold amount.

3. The system of claim 1 , wherein the plurality of parameters further includes inlet and outlet flow rates associated with the active cooling system.

4. The system of claim 1 , wherein the measured temperature is a temperature of the die arrangement.

5. A hot stamping system comprising:
a die arrangement including an active cooling system; and
a controller in digital communication with the die arrangement and programmed to close the die arrangement to hot stamp metal into a component, and in response to an amount of heat (Q E ) transferred from the component to the active cooling system exceeding a threshold amount (Q T ) indicative of a phase transformation of the component from austenite to martensite, to open the die arrangement, wherein Q E is derived from a measured temperature and component details of material specification, weight, geometry, and/or thickness.

6. The system of claim 5 , wherein the controller is further programmed to keep the die arrangement closed in response to the amount being less than the threshold amount (Q T ).

7. The system of claim 5 , wherein the measured temperature is a temperature or change in temperature of the die arrangement.

8. The system of claim 5 , wherein the measured temperature is a temperature or change in temperature of the component.

9. The system of claim 1 , wherein the controller in digital communication with the die arrangement via a computer system.

10. The system of claim 1 , wherein the amount of heat Q E transferred to the active cooling system is determined after determining the die arrangement has reached a steady state.

11. The system of claim 10 , wherein the steady state is a stabilized temperature.

12. The system of claim 1 , wherein the amount of heat Q E transferred to the active cooling system is determined by monitoring a cooling channel in the die arrangement.

13. The system of claim 12 , wherein the cooling channel includes sensors for measuring an inlet temperature and an outlet temperature of the cooling channel.

14. The system of claim 1 , wherein Q E is derived from the component material specification, weight, geometry, thickness, heat capacity, and/or latent heat and the change in the measured temperature.

15. The system of claim 1 , wherein Q E is derived from the component material specification, weight, and the change in the measured temperature.

16. The system of claim 1 , wherein Q E is derived from the component weight, latent heat, and the change in the measured temperature.

Assignees

• Ford Global Tech Llc

Inventors

• Sohmshetty Raj
• Chiriac Constantin
• Engle James
• Friedman Peter A

Classifications

• C21D11/005

  for cooling · CPC title

• B21D22/022 Primary

  by heating the blank or stamping associated with heat treatment (C21D takes precedence) · CPC title

• B21D53/88

  other parts for vehicles, e.g. cowlings, mudguards · CPC title

• C21D1/18 Primary

  Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) · CPC title

• C21D2211/008

  Martensite · CPC title