DE102007020629A1 - Device for controlling a die casting machine - Google Patents

Abstract

The invention relates to a device for controlling a die-casting machine with hydraulic means, comprising means for storing and regulating the flow of hydraulic media, characterized in that the means comprise a battery assembly of a casting unit, which is connected to a Kernzughydraulik.

Description

The The invention relates to a device for controlling a die casting machine with a hydraulic system.

to Movement of the drive piston of the injector and the movable Mold platen u. a. mostly hydraulic systems are used.

To better control pressure losses and to avoid fluctuations, it is from the DE-A-19842830 known, on one side of a drive piston, a pressure medium from a multiplier piston with a piston part of larger diameter and a subsequent piston part is supplied with a smaller diameter, at the same time with this pressure, a back pressure is also passed to the other side of the drive piston, said at this point the Pressure is changeable. The drive piston is clamped between oppositely acting forces and as a result of the hydraulic connection, the back pressure is diverted to the multiplier.

According to DE-A-102006017502 For example, in a tool clamping unit, a movable plate is moved away from a fixed plate by a first servomotor in reset operation of a core, while a second servo motor moves the movable plate back and forth to allow opening and closing of the tool. Both servomotors are assigned a control.

• – Öffnen einer Schutztüre parallel mit dem Öffnen der Giessform
• – Ziehen der Kernzüge parallel zum Öffnen der Giessform
• – Einfahren der Kernzüge parallel zum Schliessen der Giessform (problematisch).

The movement times of a die casting machine are partly responsible for the cycle time of a production plant for light metal castings. In an effort to shorten the cycle time and thus increase the productivity of the casting plant, where possible, movements are carried out in parallel. These movements are called simultaneous movements:

• - Opening a protective door parallel to the opening of the mold
• - Pulling the core pulls parallel to the opening of the mold
• - Retraction of the core pulls parallel to closing the mold (problematic).

For the parallel movement of the core pulls is a hydraulic one Drive system known which parallel to the molding movement and a secured pressure supply of Kernzughydraulik allows. Around To show a measurable effect, the flow rate needs This simultaneous hydraulic approximately the flow of the rest Reach drive group.

Around additional drive motors and pumps to avoid was this system is often built with a storage group, which are loaded in idle times by the otherwise stationary drive group can be. The additional storage group with the necessary Safeguards and the necessary for the function control However, switching valves require a considerable investment.

Of the Invention is based on the object, a device for controlling to develop a die-casting machine by hydraulic means, which is easier to manufacture and operate.

The The object is solved with the features of claim 1.

The The largest investment costs arise with simultaneous hydraulics through the additional storage group and its proper Validation.

A previously required, additional storage group is through replaced the battery pack of the casting unit. The battery pack is the Energy storage of the casting unit and is for fast pouring operations on every die casting machine absolutely necessary. The use of Battery pack as storage group for the simultaneous hydraulics thus corresponds to a significant cost savings.

through a switching valve, the Kernzughydraulik the movable platen be separated from the drive group. The pump train for loading The battery pack is in parallel via a throttle with check valve function connected to the core hydraulic system. By opening the battery charging valve The stored hydraulic energy can be controlled by means of fed to an adjustable throttle of Kernzughydraulik become.

With a minimum effort of only one switching valve and a throttle valve can be a functionally identical simultaneous hydraulics for the parallel Pulling the cores built up while opening the mold become. Preferably, the pulling of the cores, possible their Retraction during the form closure. After pulling The cores when opening the mold can be removed from the battery pack removed oil to be reloaded in idle times. The casting process is made by the interim media removal not affected by the battery pack and subsequent recharging. The contents of the battery pack are also more extensive than most ever realized storage groups of a simultaneous hydraulics.

What was created was a hydraulic system for simultaneous control processes, a simultaneous hydraulic system which can be produced inexpensively and has a smaller space requirement compared with the prior art calls. Simultaneous oil consumption, for example, for pulling cores can be obtained from the piston accumulator of the casting unit. External units can be dispensed with.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19842830 A [0003]
• - DE 102006017502 A [0004]

Claims (4)

Device for controlling a die casting machine with hydraulic means, comprising means for storing and regulating the flow of hydraulic media, characterized in that the means comprise a battery assembly of a casting unit which is connected to a core hydraulic system. Die casting machine according to claim 1, characterized that the core hydraulic by a switching valve from the battery pack is separable. Die casting machine according to claim 1 or 2, characterized characterized in that to regulate the flow of media from the battery pack for Kernzughydraulik an adjustable throttle is provided. Method for controlling a die casting machine by hydraulic means, characterized in that hydraulic Core trains parallel resp. simultaneously to the hydraulic opening the mold are pulled.