DD267313A1 - METHOD AND DEVICE FOR AUTOMATICALLY TESTING THE INTERNAL MASS OF HOLLOWING CYLINDERS - Google Patents

Abstract

The invention relates to methods and apparatus for the automatic testing of the inner mass of hollow cylinders, in particular a test device, which has an automatic supply and removal of hollow cylinders, preferably cylinder liners. In this case, the internal dimensions of the hollow cylinders are measured with the usual measuring tools at a measuring station and a sorting is carried out in accordance with the determined tolerances. During the test procedure, the hollow cylinder is removed by a feed device of the transport chain and fed to the measuring tool. Here, a centering of the hollow cylinder by head and Fußzentrierung. The solution according to the invention reduces the work steps required for testing hollow cylinders from 5 to 3 process steps.

Description

For this 1 page drawings

Field of application of the invention

The invention relates to a method and a device for testing the internal dimensions of hollow bodies. .with high dimensional accuracy requirements, in particular for testing the inner diameters of cylinder liners for the engine industry.

Characteristic of the known state of the art

In the known automatic test methods for testing the inner diameter of hollow cylinders, at least the following method steps are carried out in succession:

1. Fix the workpiece

2. Nesting of measuring tool and workpiece (transport of the workpiece to the measuring tool or transport of the measuring tool to the workpiece)

3rd measuring process

4. Separation of measuring tool and workpiece (return transport of the workpiece or the measuring tool in dio initial position)

5. Release the fixation of the workpiece

The disadvantage of these known methods lies in the high number of process steps to be carried out one after the other. Since these steps determine the cycle time of a test device, they also limit their capacity. The fixing of the workpiece is carried out by handling technology, mostly by grippers, which receive the workpiece at 3 points, based on the circular circumference. The use of diesel handling technology has the following disadvantages:

- With faster movements of the gripper arise high inertial forces, which form a limit to their speed and their life and thus negatively affect the productivity of the tester.

- Gripping technique is always relatively complicated and therefore expensive and prone to technical failures.

- Handling technology is associated with a large amount of space.

- When gripping hollow cylinders on the outer circumference in 3 points, especially in thin-walled workpieces as a result of the elastic deformation Meßwertverfälschungen.

Not only are testing devices known in which the workpiece is guided to the measuring tool, but also seiche devices in which the measuring tool is guided to the workpiece. Such a device is described in DE-OS 3407551, Kl. G01 B 21/00. In these Hrüfvorrichtungen Although the forces for fixing the workpiece and thus the risk of Meßwertverfälschungen are lower, but the measuring tool has due to the complicated drive and the elastic suspension with self-centering a very high mass, which adversely affects the cycle time and thus the capacity. Such a complex measuring tool is also very expensive and prone to failure.

The aim of the invention is to significantly increase the labor productivity in testing the inner dimensions of hollow bodies, in particular the inner diameter of cylinder liners while reducing the cost, downtime and space requirements for a test apparatus substantially, without reducing the Meßgenauirjkeit compared to the known devices ,

Explanation of the essence of the invention

The object of the invention is to provide a method and an apparatus for testing the internal dimensions of hollow cylinders or similar hollow bodies, in particular cylinder liners, in which the method steps and the mass forces of the moving parts are decisively reduced. According to the invention this is achieved by a method in which the fixing of the workpiece and the joining of the workpiece and .Meßgerät, as well as the separation of the measuring device and the workpiece and the release of the fixing are each carried out simultaneously.

By combining in each case 2 process steps in contrast to the known processes with at least 5 steps, only the following 3 process steps are to be carried out.

1. Mating of workpiece and measuring instrument with simultaneous fixation of the workpiece

2nd measuring process

3. Auüeinanderführung of measuring tool and workpiece with simultaneous release of the fixation of the workpiece

The device according to the invention consists of a conveyor system, a lifting device, a measuring tool and a fixing device. The fixing device consists of a fixed fixing ring and a spring-loaded movable guided in the direction of Meßwerkzeuglängsachse second fixing ring. The conveyor system supplies the device with workpieces and, after the test has been carried out, transports them separately according to quality differences.

The testing process is initiated with the lifting of the workpiece from the conveyor system through the top plate of the lifting device. As a result, the hollow cylindrical now loose on the lifting plate workpiece moves towards the measuring tool and is first centered at the end pointing in this direction end. This workpiece end is first pre-centered by the inner cone of the rigid fixing ring and then exactly centered by the inner cone de * -wide, movable ring. The workpiece is now fixed at this end, distributed in the radial direction over the entire circumference. While the workpiece is pushed further over the measuring tool, its not yet centered end is exactly centered by the rigid fixing ring. The spring elements located on the movable fixing ring cause the workpiece to decelerate until it is completely centered. Due to the rotational movement of the measuring tool, the entire inner circumference of the workpieces? analyzed dimensionally. After completion of the measuring process, the Plcttedor lifting device moves back to the starting position. The workpiece follows this movement due to the action of the spring elements and gravity. It wivd also brought into starting position and dissolves while the fixing rings.

This gives way to a decisive reduction in the cycle time, the susceptibility to interference and the space required. The measured value distortions and elastic deformations are largely excluded.

embodiment

The invention will be explained in more detail below on an Ausführunsbeispiel. In the accompanying drawing, a device for testing the inner diameter of hollow cylindrical workpieces is shown schematically.

Figure 1: shows the device in the starting position. Figure 2: shows the device during the measuring process on the workpiece.

The illustrated apparatus consists of a conveyor system 1 in the form of a chain conveyor, for transporting the workpieces 2, a working cylinder 3 with lifting plate 4 for conveying the hollow cylindrical workpiece 2 in the direction of the measuring tool and a fixing device 6 for fixing the workpieces 2 during the process measuring process. The fixing device 6 consists of a provided with an inner cone fixed fixing ring 7 for Grobzentriei to the workpiece upper part and for fixing the Weikstückunterteil and a guided Meßmesser'ängjachse second provided with inner ball movable fixing ring 8 for fixing the workpiece upper part. This movable fixing ring 8 is fixedly connected to sliding bushes 9, which can be moved on guide rods 10 in the direction of Meßmesslängsachse. The guide bushes 3 are connected at the top with spring elements 11, which cause a burning down in the upward movement and accelerating the movable Führunguringes 8 with the hollow cylindrical workpiece 2 boi the downward movement. The chain conveyor transports the workpieces 2 in the direction of the working cylinder 3, which then transports one of these workpieces to the measuring tool 5. At the same time, the simply executed fixing device 6 ensures a centric fixation of the workpieces 2. The measuring process is then carried out by the elastically mounted measuring tool 5 rotatable about its longitudinal axis. After completion of the measuring process, the workpiece is lowered back onto the conveyor system 1 and simultaneously released from the fixation. The chain conveyor then transports the workpieces further. By Sortiareinrichtungen the hollow cylindrical workpieces 2 are then transported according to their quality from the conveyor system 1 to the reject memory 12 or the memory 13 for good sockets.

The advantage of the invention is that the cycle time is decisively reduced by the respective simultaneous execution of the method steps fixing or releasing the workpieces and into each other or leading apart of each other and workpiece. Another advantage is that expensive, trouble-prone, space-consuming, meßwertverfälschendo and tact-time-prolonging gripping technique dispensed with the fixation process wound.

Claims (2)

1. A method for automatically checking the inner dimensions of hollow cylinders, in particular the inner diameter of cylinder liners, characterized in that the hollow cylindrical workpieces (2) during transport from the conveyor system (1) to the measuring tool (5) are gradually centered and fixed and after the measuring process during the return transport to the conveyor system (1) are released from the fixing step by step. 2. A device for automatically checking the inner dimensions of hollow cylinders, in particular the inner diameter of cylinder liners, which are brought by a conveyor system in the vicinity of the measuring tool and then transported by a lifting device from the conveyor system in the direction of a rotorisch bewegten measuring tool and transported back to the conveyor system after the measuring process be characterized in that the hollow cylindrical workpiece (2) after leaving the conveyor system (1) by a fixing device (6) is gradually taken over, which consists of a fixed fixing ring (7) having an inner cone and a cylindrical guide, wherein the lower diameter of the inner cone is made larger than the outer diameter of the workpiece and a movable fixing ring (8), which also has an inner cone and a cylindrical guide and above the cylindrical guide has a stop (14) which is larger than the Innend diameter is executed.