Unbalance measuring device

Abstract

Unbalance measuring device (1) for a rotating machining tool or chuck with a measuring device (5) for detecting the unbalance of the rotating machining tool or chuck and a display device (6) for a balancing point (7) determined on the machining tool or chuck by the measuring device (5), wherein the display device (6) has at least one display laser (10) for projecting the position of the balancing point (7) and is designed for the defined display of the position of the balancing point (7) in the longitudinal and circumferential directions on the rotating machining tool or chuck, characterized in that the intensity of the display laser (10) is variable.

Description

The invention relates to an imbalance measuring device for a rotating machining tool or chuck according to the preamble of claim 1.Such an imbalance measuring device is known from U.S. Pat. No. 6,250,155 B1. This includes a balancing machine controlled by a computer, in which the imbalance is determined according to size and direction. It also contains two compensating elements with a defined imbalance, by means of which the imbalance is compensated by spreading it open into corresponding adjustment positions. By means of a marking device provided with a laser, visible markings can be projected onto the compensating elements under the control of the computer.DE 31 15 609 A1 discloses a device for identifying unbalances on a vehicle wheel. This device contains a marking device designed as a spraying device or laser, which marks the vehicle wheel in specific angular positions in a controlled manner as a function of an imbalance variable and phase position determined by means of an imbalance measuring device.U.S. Pat. No. 6,484,574 B1 discloses a balancing machine for a wheel rim / tire assembly, which includes a control circuit for a motor for holding the wheel rim / tire assembly in a desired rotational position. The optimum position of the planes, the quantity of the correction weights and the number of correction weights are calculated by the control circuit in such a way that a minimum static and dynamic residual imbalance arises. A laser pointer illuminates the surface of the wheel rim / tire assembly at the axial position of the imbalance plane at which the imbalance compensation weight is to be attached.The object of the invention is to provide an imbalance measuring device of the type mentioned at the beginning which enables more accurate and rapid balancing.This object is achieved by an imbalance measuring device having the features of claim 1. Advantageous embodiments of the invention are specified in the dependent claims.The unbalance measuring device according to the invention is characterized in that the display device has at least one display laser for projecting the position of the balancing point and is designed for defined display of the position of the balancing point in the longitudinal and circumferential direction of the rotating component. This avoids the inaccuracies in manual measurement of the position of the balancing point and the display of the balancing point can be carried out particularly precisely and quickly. The intensity of the laser is adjustable, so that the balance point can only be illuminated or marked permanently. Such a marking is permanently connected to the component and cannot be removed easily without any danger. In addition, such a marking can be attached with high precision owing to the thin and high-resolution focusability of the display laser, which is advantageous for the adjustment of the component during the subsequent balancing.The unbalance measuring device according to the invention can be used for detecting the unbalance in a multiplicity of rotating components. These components include, for example, rotating machining tools, or clamping chucks or shrink-fit chucks.The display device can be advantageously designed to display the position of the balancing point by means of a point, cross or reticle marking. This increases the visibility of the display and simplifies the adjustment of the component during the balancing. A point, cross or reticle marking can be achieved by suitable optical means such as lenses and / or diaphragms.Alternatively, the marking can be produced by a punctiform laser beam. The movement of the point of impingement of the beam on the component necessary for this can take place solely by deflecting the laser beam or by a combination of deflection of the laser beam and rotational movement of the component with the aid of the imbalance measuring device. However, it is also possible to use a plurality of display lasers, which can also have a different orientation and are designed to display the position of the same or different balancing points in the longitudinal and circumferential direction of the component.In an advantageous embodiment, the display device can be designed as a marking device for applying a fixed marking. This avoids the inaccuracies in the case of manual marking of the position of the balancing point and the marking of the balancing point can be carried out particularly precisely and quickly.Fixed markings in the sense of the invention are understood to be all markings which are fixedly mounted on or attached to the component. This includes application of material, such as e.g. simple color applications, as well as processing of the surface of the component by heat input or material removal.The marking can be firmly applied to the surface of the component by means of the display laser by heat input. Lasers with sufficiently high intensity are necessary for this purpose.In particular in the case of ablative marking methods using lasers, the evaporated material of the component can condense again and form disruptive deposits. In order to prevent this, a suction device for the steam can advantageously be provided.In the case of components made of bare steel or with other specular surfaces, there is the risk that the laser beam will be at least partially reflected and can no longer develop sufficient effect, in particular if it strikes the surface at a small angle. It is therefore advantageous if the exit point of the laser beam can be positioned such that the laser beam impinges as perpendicularly as possible on the surface, so that it is at most slightly reflected.The measuring device can contain a device for positioning the determined balancing point in a display or marking position. In the display or marking position, the component to be balanced is positioned with respect to the display device in such a way that the display device can display the balancing point or can identify it by means of a fixed marking. This has the advantage that the component can be positioned and marked quickly and precisely.In addition, a device for locking the component to be balanced in the display or marking position can be provided in the measuring device. This locking device can be designed, for example, as an electrical or mechanical brake and enables a secure fixing of the component to be balanced.Expediently, the measuring device can be assigned to a receptacle for the component to be balanced, which receptacle is rotatably mounted in a machine housing. By the direct assignment, a particularly high measurement accuracy and a compact structure can be achieved.On the machine housing, an operating panel with operating and display elements for data input and data output can be arranged. This enables direct operation of the imbalance measuring device. The control panel can comprise input options for all parameters which are necessary for the control of the marking device. The control panel can also be used to check the input data quickly and easily and to read out results.In a particularly advantageous embodiment, a region suitable for the balancing can be specified by the control panel. This region on the component is provided specifically for the balancing and, by the specification of the region, the imbalance measuring device can determine a balancing point within this region.On the machine housing of the imbalance measuring device, a protective cover for protecting the operating personnel can be arranged in an expedient manner. The protective cover can cover the component during the measurement, so that optimum protection is ensured.In a particularly expedient embodiment, the protective cover can be transparent or opaque. A transparent protective cover enables observation of the imbalance measuring device when determining the imbalance and sufficient protection against the radiation of the laser, whereas a light-opaque protective cover offers maximum protection against the radiation of the laser. In a preferred embodiment, the protective hood is transmissive for the visible light and opaque for the laser light.Further features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings. The following are shown: FIG. 1 is a perspective view of an imbalance measuring device according to the invention, and FIG. 2 shows a detailed view of the representation from FIG. 1.FIG. 1 shows an imbalance measuring device 1 for balancing a rotating component 2 in a perspective view. The imbalance measuring device 1 consists of a machine housing 3 which carries an operating panel 4, a measuring device 5 for determining the imbalance and a display device 6 for the defined display of the position of a balancing point 7 in the longitudinal and circumferential direction of the rotating component 2.The control panel 4 is arranged on a front side of the machine housing 3 and has various input and output elements for operating the imbalance measurement device 1.In the machine housing 3 a work spindle drivable by a motor is rotatably mounted. The machine housing 3 contains a horizontal surface 8, in which an upwardly open receptacle 9 of the working spindle for the component 2 to be balanced is arranged.The holder 9 of the work spindle is assigned the measuring device 5 for determining the imbalance of the inserted component 2. On the horizontal surface 8, the display device 6 is also arranged with a display laser 10 oriented in the direction of the component 2. The unbalance measuring device 1 also has a protective cover 11.FIG. 2 shows a detailed view of the imbalance measuring device 1 with the control panel 4, the measuring device 5 and the display device 6. The control panel 4 consists of a display screen 12 around which a plurality of keys 13 are arranged. The data input via the buttons 13 can be checked by means of the display screen 12 and output values of the imbalance measurement device 1 can be displayed.The measuring device 5 furthermore contains a device, not shown, for positioning the determined balancing point 7 with respect to the display device 6. By means of the drive motor of the work spindle, the component 2 can thus be rotated into any position in a controlled manner. In order to fix the component 2 in a display or marking position, a device for locking the component 2 can also be provided.For the protection of the operators, the display device 6, the measuring device 5 and the component 2 can be closed by the protective cover 11. The protective cover 11 has such a transparency that the radiation of the display laser 10 is absorbed and the measuring device 5 can nevertheless be observed during the imbalance measurement. However, totally opaque materials may be used for the protective cover 11.The operation of the unbalance measuring device is described in more detail below:The component 2 to be measured is inserted into the receptacle 9. Data relating to the component 2 and the imbalance measurement are input via the control panel 4. An input variable for the imbalance measuring device 1 is, for example, the specification of a range for the height of the component 2 at which a balancing can be carried out by the removal of material. In addition, the diameter of compensation bores and the number of compensation bores can also be specified, with which the material necessary for the balancing is to be removed from the component 2. With regard to the imbalance detection, the rotational speed of the receptacle 9 and thus of the component 2 can also be predefined.To detect the imbalance, the component 2 is driven by means of the drive motor, not shown, via the rotatable mounting of the receptacle 9. By means of the measuring device 5, a centrifugal force and / or vibration generated by imbalance of the component 2 can be determined. The measuring device 5 can be integrated into the mounting of the receptacle 9 and thus record the centrifugal force and / or vibration of the component 2 directly and with very little error tolerance.If the imbalance is detected, an imbalance or correction position suitable for imbalance compensation is determined in a corresponding computer and the holder 9 is rotated and stopped by the drive motor in such a way that the balancing point 7 is aligned in the direction of the display laser 10 and the component 2 is thus in the display or marking position. On the basis of the rotary encoder, the position of the receptacle 9 can be continuously checked and the desired position can be approached reproducibly and accurately. The balancing point 7 is calculated by the imbalance measuring device 1 in such a way that both static and dynamic balancing is possible.As soon as the balancing point 7 is aligned in the direction of the display laser 10, the balancing point 7 is projected by means of the display laser 10 and the position of the balancing point 7 in the longitudinal and circumferential direction of the rotating component 2 is thus displayed. In a subsequent step, the projection of the display laser 10 can be reproduced by an operator and thus firmly attached to the rotating component.In the case of materials that reflect only weakly, the marking 14 can also be attached to the balancing point 7 by means of the display laser 10 by local heat input on the surface of the component 2. For this purpose, the surface of the component 2 is heated at the balancing point, so that a fixed marking, for example in the form of a point, cross or reticle marking, is burnt into the component 2 at the balancing point.After marking the balancing point 7, the component 2 can be removed and at the marking 14 on the component 2 a removal bore with the selected diameter and with a depth determined by the imbalance measuring device 1 can be introduced into the component 2 by means of a drill. As a result, material for balancing is removed and the component 2 is balanced.However, it is also possible to change the intensity of the display laser 10 in such a way that material on the component 2 can be removed for balancing with the aid of the display laser 10. For this purpose, the display laser 10 heats the material at the balancing point 7 so strongly that it sublimes, i.e. a phase change from the solid phase to the gaseous phase occurs. A defined balancing region can be provided on the component 2, which is integrated directly into the component 2 or is formed as a separate component. This balancing region can be formed by a material with low evaporation energy, such as plastic, in order to enable simple processing with the display laser 10. Possible embodiments for the balancing region are a ring or even screws which are firmly connected to the component 2. A suction device can be provided for suctioning off the vapors formed during sublimation.The balancing can take place when the component 2 is stationary and rotating. With the aid of a rotary encoder in a receptacle for the component 2, the rotational position of a rotating component 2 can be determined continuously, so that the display laser 10 can remove material from the balancing region whenever the balancing point 7 passes the display laser 10. Such a balancing with rotating component 2 enables the continuous monitoring of the balancing process, since the effect of the material removal on the imbalance of component 2 can be continuously checked by means of measuring device 5.

Claims

Unbalance measuring device (1) for a rotating machining tool or chuck, having a measuring device (5) for detecting the unbalance of the rotating machining tool or chuck and a display device (6) for a balancing point (7) determined by the measuring device (5) on the machining tool or chuck, wherein the display device (6) has at least one display laser (10) for projecting the position of the balancing point (7) and is designed for the defined display of the position of the balancing point (7) in the longitudinal and circumferential direction on the rotating machining tool or chuck, characterized in that the intensity of the display laser (10) can be varied.Unbalance measuring device according to claim 1, characterised in that the display device (6) is designed to display the position of the balancing point (7) by means of a point, cross or reticle marking.Unbalance measuring device according to Claim 1 or 2, characterized in that the display device (6) has two or more differently oriented display lasers (10).Unbalance measuring device according to one of the preceding claims, characterized in that the display device (6) is designed as a marking device for applying a fixed marking.Unbalance measuring device according to one of the preceding claims, characterized in that the measuring device (5) contains a device for positioning the ascertained balancing point (7) in a display or marking position.Unbalance measuring device according to one of the preceding claims, characterized in that the measuring device (5) contains a device for locking the machining tool or chuck in a display or marking position.Unbalance measuring device according to one of the preceding claims, characterized in that the measuring device (5) is assigned to a receptacle (9) for the machining tool or chuck, which receptacle is rotatably mounted in a machine housing (3).Unbalance measuring device according to claim 7, characterised in that an operating panel (4) with operating and display elements (12, 13) for data input and data output is arranged on the machine housing (3).Unbalance measuring device according to claim 8, characterised in that a region suitable for the balancing can be predetermined by the control panel (4).Unbalance measuring device according to one of Claims 7 to 9, characterized in that a protective cover (11) is arranged on the machine housing (3).Unbalance measuring device according to claim 10, characterised in that the protective cover (11) is transparent or opaque, in particular opaque to laser radiation.

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