DE4401212C1 - Method of measuring, grinding and machining raw castings - Google Patents

Abstract

A method of measuring, grinding and machining raw castings is specified, in which - the casting is fixed on a pallet, and - the pallet/casting unit thus formed is measured in a measurement position in accordance with the preset values for the machining or grinding in a first machining centre and the measured results determined are stored in an electronic data carrier allocated to the pallet, - the pallet/casting unit is put onto a pallet fixture (6) of the first machining centre and the data is transferred from the electronic data carrier into a control system of the first machining centre, - a minimum of three spherical recesses serving as receptacles are made in one side of the casting in a first step on the first machining centre, - grinding operations are carried out in a second step on the first machining centre in accordance with the information available in the control system, - the pallet is removed from the casting after completion of the machining in the first machining centre, and - the casting is mounted on the locating pins, allocated to the spherical recesses, of a second machining centre for the final machining of the casting and is finish-machined.

Description

The invention relates to a method for measuring, grinding and machining raw castings.

The processing of raw castings is still largely done by hand today, which has several disadvantages. For one thing, it is unreasonable for the workers to see this very dirty, to carry out work accompanied by noise and dangerous for accidents. Second, for the Bear processing, for example machining, of particular importance that a raw casting despite its series character is unique with regard to its geometry deviation and burr displacement in relation to the original model; Raw castings are made with tolerances of approx. 2-5 mm cast. These tolerances must be compensated for when processing the raw castings or compensated for, which is only partially possible with previous means (by hand) is.

DE-OS 22 17 206 describes a method and machine system for treating and Known workpieces, especially prismatic workpieces. In which Known methods are the workpieces to be treated or machined in the course of the work process is clamped and clamped several times from the workpiece carrier carrying it and processed in a respective processing station. The essence of the known method is the constant (repeated) measurement or remeasurement in all possible stages of the Working process. In this way, the measured values are entered manually (claim 2), there is no method for measuring, grinding and machining raw Realize castings that meet the modern requirements in terms of accuracy and of the material flow.

The invention has for its object a method for machining machining To create raw castings that largely run automatically, the casting-related Tolerances taken into account and optimal conditions for finishing the raw casting piece creates.

According to the invention, this object is achieved by a method for measuring, Grinding and machining raw castings, being

• - The casting is fixed on a pallet and
• - The pallet / casting unit thus formed in accordance with the specifications for the chip removal finishing or grinding processing in a first machining center in a measuring station measured and the determined measurement results on one of the range assigned electro African data medium are stored,
• - The pallet / casting unit is placed on a pallet holder ( 6 ) of the first machining center and the data from the electronic data carrier are transferred to a control system of the first machining center,
• - In a first step on the first machining center on one side of the casting at least three dome-shaped recesses are used as receptacles,
• - In a second step, grinding operations are carried out on the first machining center according to the information available in the control system.
• - After finishing the machining in the first machining center, the pallet of the Casting is removed and
• - The casting on the dome-shaped receptacles associated egg egg nes second machining center for the finishing of the casting and finally machined.

The advantages achieved with the invention consist essentially in the fact that the raw cast pieces, for example axle bridges for trucks, are each individually processed as required for later practical application. In other words, the (machining) processing is carried out in such a way that tolerances caused by the casting technique no longer play a role and that the processing is largely automatic. Furthermore, the measuring station 5 provided according to the invention enables a preliminary check of each raw casting, that is to say a decision is made at a very early stage as to whether the raw casting is even fed to further processing; it can happen that the casting tolerances are so large that processing the raw casting would be nonsensical.

The invention is described in more detail with reference to the drawings. It shows

Fig. 1 is an overview sketch of the new method and

Fig. 2 shows a detail of the second machining center.

On the right side of Fig. 1, several raw castings 1 are lined up, which come out of the casting. A raw casting 1 is put into a measuring station 5 from this intermediate storage. First, the raw casting 1 is fixed with workpiece-specific intermediate elements on a pallet 2 (screwed tight). The resulting pallet / casting 3 unit is clamped and measured on the measuring station 5 , for example with the help of a multi-coordinate measuring machine. The purpose of this measurement is to determine data for the processing of one of the first and a second processing center 4 or 7 , which are supplied to an electronic data carrier which is assigned to the pallet 2 .

Then the unit pallet / greeting 3 is placed on a pallet holder 6 of the first machining center 4 and the data on the electronic data carrier of the pallet are transferred to a control system of the first machining center 4 .

In a first step, at least three dome-shaped recesses 9 serving as receptacles are machined on the first machining center 4 on one side of the raw casting 1 . FIG. 2 shows schematically what this measure is all about: the raw casting 1 has said dome-shaped recesses 9 serving as receptacles. The second machining center 7 has matching receiving pins 8 , which are convex at the upper end to match the respective calotte. By means of this technique, the raw casting 1 can be stored, aligned, clamped and machined in the second machining center 7 on the mounting pin 8 without any problems.

The second step of machining on the first machining center 4 is to carry out the grinding operations in accordance with the information available in the control system, supplemented or corrected by the data carrier of the pallet 2 .

After completion of all work in the first machining center 4 , the pallet 2 is removed from the raw casting 1 . The raw casting 1 comes to the second machining center 7 , where it is placed on the receiving pin 8 described, and the pallet is brought back to the pallet 10 , from where it is returned to the measuring station 5 for further use.

In the second machining center 7 , after the raw casting 1 is clamped, the finishing, which can consist, for example, of drilling center holes and milling bearing surfaces.

With the invention, therefore, a method for measuring, grinding and machining raw castings 1 was created, with which precise, inexpensive and without significant nuisance to the worker raw castings 1 cleaned (ground) and machined so that the Raw castings 1, despite their casting-related tolerances, leave a station in an assembly-ready state, which works according to the method according to the invention.

Claims (1)

Method for measuring, grinding and machining raw castings ( 1 ), wherein

• - The casting ( 1 ) on a pallet ( 2 ) fixed and
• - The unit pallet / casting ( 3 ) thus formed in accordance with the requirements for machining or grinding machining in a first machining center ( 4 ) in a measuring station ( 5 ) and the determined measurement results on one of the pallet ( 2 ) assigned electronic Data carriers are stored,
• - The unit pallet / casting ( 3 ) is placed on a pallet holder ( 6 ) of the first machining center ( 4 ) and the data from the electronic data carrier are transferred to a control system of the first machining center ( 4 ),
• - In a first step on the first machining center ( 4 ) on one side of the casting ( 1 ) at least three dome-shaped recesses ( 9 ) serving as receptacles are introduced,
• - In a second step on the first machining center ( 4 ) grinding operations corresponding to the information available in the control system are carried out.
• - After finishing the processing in the first machining center ( 4 ), the pallet ( 2 ) is removed from the casting ( 1 ) and
• - The casting ( 1 ) on the dome-shaped recesses ( 9 ) assigned receiving Zap fen ( 8 ) of a second machining center ( 7 ) for the finishing of the casting ( 1 ) clamped and finally machined.