# US 5,699,849 A · Hot-chamber diecasting machine

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,699,849 A
- Document ID: US5699849A
- Status: Granted
- Kind: A
- Application number: 08/592,348
- Filed: 1996-02-07
- Granted: 1997-12-23
- Earliest claimed: 1994-06-07
- Assignees: Oskar Frech GmbH + Co. KG
- Inventors: Roland Fink
- Web page: https://patentgrep.com/patent/US5699849A

## CPC

- B22D 17/32: Controlling equipment
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)

## Abstract

In order to improve the compression operation and to produce better products with thin-walled castings, the invention calls for the compression operation to be divided into three phases and controlled by high-dynamic continuous-operation valves which have very short switching times and are actuated by a control device. Fitted in the hot-chamber die-casting machine for this purpose is a metal sensor which is disposed in a die relief leading from the rising bore in the casting container into the mould.

## Claims

### Claim 1

In a hot-chamber diecasting machine in which an injection process is influenced by an electronic control device to which input signals from an injection assembly are supplied, said diecasting machine having a casting container which dips into a melt and has a riser with a mouthpiece body mounted thereon, the mouthpiece body being guided with a nozzle tip up to a mold, the improvement comprising:
a metal sensor operatively arranged in a vicinity of a tip of the mouthpiece body, said metal sensor being connected with the electronic control device for feeding input signals to said electronic control device; and
high-dynamic continuous valves having switching times between 1 and 5 ms arranged to influence the injection process, said high-dynamic continuous valves being actuated by said electronic control device and permitting speed and pressure regulation which is suitable for a product to be cast.

### Claim 2 (depends on 1)

The hot-chamber diecasting machine according to claim 1, wherein said mouthpiece body includes a receptacle into which the nozzle tip is inserted; and
wherein a receiving chamber is formed between said mouthpiece body and said nozzle tip in which is placed said metal sensor.

### Claim 3 (depends on 1)

The hot-chamber diecasting machine according to claim 1, further comprising an evacuation device having a vacuum pump and a valve associated with said mold, said valve being located upstream from said vacuum pump and being operable by said electronic control device.

### Claim 4 (depends on 1)

The hot-chamber diecasting machine according to claim 1, wherein said metal sensor is a non-contacting sensor which reacts to a presence of a metal melt.

### Claim 5 (depends on 4)

The hot-chamber diecasting machine according to claim 4, wherein said non-contacting sensor is a magnetic field sensor.

### Claim 6 (depends on 1)

The hot-chamber diecasting machine according to claim 1, wherein said metal sensor is an electrical sensor having a contact surface, said electrical sensor being operatively arranged in said mouthpiece body.

### Claim 7

In a hot-chamber diecasting machine, the improvement comprising:
a metal sensor operatively arranged in a vicinity of a tip of a mouthpiece body, said metal sensor providing signals indicating a presence of a metal front;
high-dynamic continuous valves having switching times between 1 and 5 ms operatively arranged so as to influence an injection process for the hot-chamber diecasting machine; and
an electronic control device which receives the signals from said metal sensor and which actuates said high-dynamic continuous valves permitting desired speed and pressure regulation for a product being diecast.