MEASURING DEVICE AND MEASURING METHOD FOR AN INJECTION MOLDING MACHINE FOR ASCERTAINING A BATCH-SPECIFIC CHARACTERISTIC NUMBER

• US 20110254183A1
• Filed: 04/19/2011
• Published: 10/20/2011
• Est. Priority Date: 04/20/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Maris-Haug, Patricia, Lehtonen, Paeivi, Ackermann, Jens, Liedl, Philipp, Haag, Guenter, Geise, Stephan
• Granted Patent: US 8,518,309 B2
• Time in Patent Office: Days
• US Class Current: 264/40.1
• CPC Class Codes: B29C 2945/76006 Pressure
• CPC Class Codes: B29C 2945/7604 Temperature
• CPC Class Codes: B29C 2945/7605 Viscosity
• CPC Class Codes: B29C 2945/7618 Injection unit
• CPC Class Codes: B29C 2945/7621 nozzle
• CPC Class Codes: B29C 2945/76214 drive means
• CPC Class Codes: B29C 2945/76254 Mould
• CPC Class Codes: B29C 2945/76274 runners, nozzles
• CPC Class Codes: B29C 2945/76307 hydraulic fluids
• CPC Class Codes: B29C 45/7646 viscosity
• CPC Class Codes: G01N 11/08 by measuring pressure required to produce a known flow

Abstract

A measuring device for an injection molding system for ascertaining a batch-specific characteristic number of a plasticized plastic includes a flow channel which is situated between a plasticizing unit of an injection molding machine and an injection molding tool, a first pressure sensor and a second pressure sensor and a first temperature sensor and a second temperature sensor being situated along the flow channel. The flow channel has a taper between the first pressure sensor and the second pressure sensor.

Claims

1. A measuring device for an injection molding system for ascertaining a batch-specific characteristic number of a plasticized plastic, comprising:

a flow channel for situating between a plasticizing unit of an injection molding machine and a tool;

a first pressure sensor situated along the flow channel;

a second pressure sensor situated along the flow channel;

a first temperature sensor situated along the flow channel; and

a second temperature sensor situated along the flow channel;

wherein the flow channel has a taper between the first pressure sensor and the second pressure sensor.

2. The measuring device as recited in claim 1, wherein the first pressure sensor is situated within the injection molding machine.

3. The measuring device as recited in claim 1, wherein the second pressure sensor is situated within the tool.

4. The measuring device as recited in claim 1, wherein the measuring device is a component separate from the injection molding machine and the tool.

6. The measuring device as recited in claim 4, wherein at least one of the first evaluation module and the second evaluation module are integrated into a control system or regulating system of the injection molding machine.

5. The measuring device as recited in 1, further comprising:

an external first evaluation module and an external second evaluation module.

7. An injection molding system, comprising:

a plasticizing unit;

a tool; and

a measuring device, the measuring device including a flow channel for situating between the plasticizing unit and the tool, a first pressure sensor situated along the flow channel, a second pressure sensor situated along the flow channel, a first temperature sensor situated along the flow channel, and a second temperature sensor situated along the flow channel, wherein the flow channel has a taper between the first pressure sensor and the second pressure sensor.

8. A measuring method for ascertaining a batch-specific characteristic number of a plasticized plastic, while plastic flows through a flow channel, which is situated between a plasticizing unit and a tool, the flow channel having a taper, during an injection molding operation, the method comprising:

carrying out a first measurement during a first injection molding operation, in which first measured data of a first pressure sensor provided along the flow channel and first measured data of a second pressure sensor provided along the flow channel are detected during a first measurement interval having a first lower measuring time and a first upper measuring time;

forwarding the first measured data of the first measurement to a first evaluation module and to a second evaluation module;

calculating a second measurement interval in the first evaluation module at a second, lower measuring time and at a second, upper measuring time;

ascertaining a first batch-specific characteristic number in the second evaluation module;

storing the first lower and upper measuring times and the first batch-specific characteristic number; and

carrying out a second measurement during a second injection molding operation, in which second measured data of the first pressure sensor and of the second pressure sensor are detected during the second measurement interval.

9. The measuring method as recited in claim 8, wherein at least one of the first lower measuring time, the first upper measuring time, the second lower measuring time, and the second upper measuring time is set manually.

10. The measuring method as recited in claim 8, wherein at least one of the lower and upper measuring times are statistically evaluated, and values ascertained for subsequent injection molding operations are used for at least one of the lower and the upper measuring time.

11. The measuring method as recited in claim 8, wherein the batch-specific characteristic number ascertained in the second evaluation module is supplied to at least one of a control system and a regulating system of an injection molding machine in the form of an input signal.