DK178066B1 - Optimized metal printing using lathe - Google Patents

Abstract

The invention consists of using a lathe for a process machining consisting of one or more operations in connection with metal printing (spinning) and finishing of a workpiece. The workpiece tension in the lathe is without pinol restraint.

Description

Optimized metal printing using lathe

Technical area

The invention consists in forming metallic workpieces by means of metal printing, also referred to as 'spinning' using a 'lathe' without pinol retention.

BACKGROUND OF THE INVENTION

Metal printing (spinning) using a 'pressure bench' is known technology. The workpiece machining can be referred to as point-by-step reshaping and the workpiece tension in the bench is supported by pin stock (tail stock). Due to this physical resistance, there is not much flexibility in the possibilities of using multiple alternating processes and thus finishing the work even while it is clamped.

In the outlined invention, the workpiece is clamped in a lathe with no pinol restraint which allows for combination machining of the workpiece. Thus the possibility is obtained: spinning in lathe, reshaping and machining in one and the same tension.

As an example, a circular workpiece is machined to become a tire plate for a lamp base.

The sub-processes are: 1) the workpiece in the form of an aluminum plate is clamped in the die in a lathe; 2) drilling a hole in the workpiece as part of the workpiece specification; 3) the edge of the blank is 'lowered' at an angle by means of the printing roller and supported by the shape of the die; 4) turning off the edge; 5) the workpiece is finished using 'sun shine'.

In relation to the use of a 'spinning bench' for spinning, the invention of using a 'lathe' for spinning gives great flexibility in the processes and thus great savings in time in subject handling and machining.

Figure Overview

Figure 1. This sketch shows an example of a circular end product.

Figure 2. This sketch shows the workpiece tension in a lathe.

Figure 3. This sketch shows an example of the special tool.

Figure 4. This sketch shows an example of process setup.

Prior art is described in GB 1 389 480 A, but the present invention differs from prior art with several aspects: • Workable items are sheet metal (28).

• The workpiece is transformed from a plane state to an angle-bent state, e.g. perpendicular, i.e. a 90 degree transformation (28.29).

• The roll bar (24) has a passive role in machining; the function of the roll bar is to hold the workpiece to the fixture (22) and not actively participate in the workpiece shaping. Thus, only the pressure roller (23) actively participates in the reshaping of the workpiece (28).

• The roll bar is spring loaded and not fixed.

• The alignment / adjustment of the spinning tool (26) is relative to the workpiece geometry.

Description of the Invention

Items in the form of sheets of various metals can be machined, for example, but not limited to the materials: steel, aluminum, copper, brass, zinc and stainless steel.

Figure 1 shows an example of a blank (10) wherein the starting material is a 2 mm aluminum plate. The subject may have a preprocessing, e.g. in the form of a punched hole (12).

After machining, the outer edge is reshaped e.g. to a 90 degree deflection (15).

The workpiece is positioned and clamped in the lathe (20) by vacuum (Figure 2a).

Figure 2a also illustrates how the blank (round) (28) is positioned on the fixture / die (22) so that the edge of the blank can be pressed at an angle. The workpiece rotation is made by the lathe main spindle (21).

Figure 2 also illustrates how the special tool (26) for performing the actual metal printing is made up of the sub-components a) a spring actuated roller (24,25) and b) a pressure roller (23).

Figure 2b illustrates how the workpiece is reshaped (29) after machining the special tool (26).

Figure 3 shows details of the special tool with bystand roller (24) and pressure roller (23).

The restraint needed to carry out the spinning is provided by a spring-loaded (25) retaining roller (24).

Depending on the direction of movement (27) of the special tool (26), ie. the angle between the fixture and the special tool, the holding and pressure roll attack angles are designed accordingly.

In an embodiment of the invention, the blank (28) in the form of a plate is clamped to the die (22) such that: • the surface (28) of the blank is in parallel plane with the die surface (22), • the die (22) is mounted in the perpendicular plane with the rotating spindle (21), • the direction of movement (27) of the special tool is perpendicular to the lathe die (22); ca. 45 degrees relative to the workpiece (28).

In other given implementations, the tool (26) can be set according to the geometry of the workpiece (28).

An important aspect of machining is that the retaining roll (24) is kept clean so chips do not get stuck to the workpiece (28). This can be achieved by a standardized application of k / s agent to the workpiece and tool during the spinning process.

The quality and economic advantages of using the outlined invention can be summarized as follows: (a) there is only one clamp, viz. that less tolerances are operated; b) utilizes machine waiting time, viz. that process-time is freed; (c) greater plan of the subject than of the winding-up; d) cheaper raw material.

An example of manufacturing an aluminum blank wherein the finished product constitutes a cover plate for one foot to a TV stand is described below.

Material and machine requirements:

Material: 2mm aluminum plate AL99, 7MgCu 0.8 (PA 708) state H111 surface (430 high gloss).

Fixed trip: made of aluminum.

Machine: Brinkmann UNO.

Plane sled X axis: drive torque 16Nm, max tightening force 10200N.

Longitudinal sledge Z axis: torque 16Nm, max tightening force max 20400N.

Subject retention: vacuum.

Special tool with holding roller and pressure roller.

The starting material is a round flat plate (round) held on a vacuum fixture: 1. The specially designed spinning tool is moved against the round; 2. The resilient retainer roll '' supports the 'round and the pressure roll converts the round ("lowers" the edge); 3. The specially designed spinning tool is moved back; 4. The work is taken off; 5. The work is finished and can be removed from the fixture.

An important aspect of the invention is that power effects are used, taking into account machine safety and fixture safety.

In the stated assessment, the passive force (in the X direction) is disregarded as its size is negligible.

Figure 4 shows how a complete and integrated process station (40) can in practice be configured in a standard lathe with associated vision equipment (41), polishing function (42) and workpiece control (43) and workpiece control (44) .

Claims (4)

1. A method of producing a shaped metal object by means of metal printing, wherein the workpiece is clamped in a lathe without the use of pinhol restraint and the workpiece is processed under the influence of a printing roller, the method being characterized by the workpiece (28) being worked by a special tool ( 26) having a spring-loaded (25) retaining roller (24); • holding roller (24) retaining the workpiece (22) during machining; • the workpiece (28) being transformed from flat to perpendicular, including a 90 degree. • the metal object (28,10) to be machined is a sheet of one of moldable materials such as aluminum, steel, stainless steel, iron, brass, zinc and copper. A method according to claim 1, wherein the special tool is advanced in a direction of movement, characterized in that the direction of movement (27) during machining of the blank (28) is perpendicular to the blank and perpendicular to the fixture X, Y plane (22). A method according to any of the preceding claims, wherein a metal object in the same clamp is processed by several alternating processes characterized by consisting of one or more of a number of individual operations for metal printing, chip cutting and polishing. 4. A special tool for producing metal-printed items characterized by combining a spring-influenced holding roller (24) and a printing roller (23) in the same tool (26).