• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a device (1) for producing an impression in a test object (2) for a hardness test, comprising a slide (3) for receiving the test object (2) and a clamping body (4) for clamping the test object (2) on the slide (3), wherein the Verspannkörper (4) along a guide (5) on the slide (3) relative to the test object (2) by means of a drive motor (6) having drive means (7) is adjustable, wherein the drive motor (6) with a rotatably mounted threaded spindle (8) is connected to which a with the Verspannkörper (4) fixedly connected spindle nut (9) engages, and with a test body (10) for applying a test load on the test object (2), wherein the test body (10) is mounted vertically displaceable on Verspannkörper (4). In order to enable rapid delivery of the Verspannkörpers to the test object without the risk of damage to the test object or parts of the device, it is provided that between the Verspannkörper (4) and the spindle nut (9) at least one force sensor (11) is arranged.
    公开号:AT517833A4
    申请号:T51005/2015
    申请日:2015-11-25
    公开日:2017-05-15
    发明作者:Buchsteiner Werner
    申请人:EMCO-TEST Prüfmaschinen GmbH；
    IPC主号:
    专利说明:

    The invention relates to a device for producing an impression in a test object for a hardness test, with a slide for receiving the test object and a Verspannkörper for clamping the test object on the slide, wherein the Verspannkörper along a guide on the slide relative to the test object by means of a drive motor having a drive device is adjustable, wherein the drive motor is connected to a rotatably mounted threaded spindle, which engages a fixedly connected to the Verspannkörper spindle nut, and with a test specimen for applying a test load on the test object, wherein the specimen is mounted vertically displaceable on Verspannkörper.
    Furthermore, the invention relates to a method for producing an impression in a test object for a hardness test, wherein a test object is received on a slide and a Verspannkörper along a guide on the slide the test object by means of a drive means the test object is delivered, wherein the Verspannkörper for clamping the test object is lowered on the slide via a threaded spindle and a spindle nut having screwing until the Verspannkörper rests on the test object, and wherein after clamping of the test object penetrates a relative to Verspannkörper vertically displaceable indenter with a defined test load in the test object.
    The test object is the part picked up by the slide of the device whose hardness is to be tested. Under test specimens here is a penetrating into the test object under force body to understand, which is relative to the Verspannkörper vertically displaceable and a defined test load acted upon.
    In known hardness testing machines with usually vertically vertically adjustable Verspannkörpern the delivery of the Verspannkörpers to the test object is very slow because no automatic deceleration occurs before the test object and crushed the test object or parts of the Verspannkörpers at rapid delivery by the inertia of the drive device or damaged. Furthermore, hardness testing machines are known which detect an impact by means of distance sensors (for example an optical sensor or by means of an ultrasonic sensor) and thereby decelerate in front of the test object. However, this solution by means of distance sensors works very unreliable because it is easy to disturb, which is partially slowed down too early or not at all.
    From DE 10 2008 034 134 Al a device for producing an impression in a test material for a hardness test is known. The drive motor generates a force to press the indenter into the surface of the specimen. In this case, a spindle is provided in a rotationally fixed connection with the drive motor, which is in engagement with a spindle nut. On the spindle nut is a load cell, at the end of the indenter is attached. In principle, this load cell of the test load application could also be used as a hit detection, but even before the hardness test an impression would be generated in the test object which influences the measurement result. In addition, the force sensors commonly used are too sensitive to be able to slow down sufficiently fast delivery to the test object without damage. Furthermore, the system shown in DE 10 2008 034 134 A1 is not designed for the clamping of the test object, but only for the application of the desired test load to produce a hardness test pressure.
    The invention is based on the object, in a device for producing an impression in a test object to allow rapid delivery of the Verspannkörpers to the test object without the risk of damage to the test object or parts of the device.
    This object is achieved according to the invention in that at least one force sensor is arranged between the bracing body and the spindle nut. By means of the force sensor, the force acting between the spindle nut and the bracing body can be measured, at least during the feed process and / or the bracing process, and the drive device can be braked or stopped when a defined value is reached or exceeded.
    With the force sensor arranged between the bracing body and the spindle nut fastened thereto, any change during the feed movement of the test body or of the bracing body can be monitored. This makes it possible to reliably detect an impact of the Verspannkörpers on the test object and the
    Reaching a certain threshold of force to decelerate or completely stop.
    Furthermore, the force sensor can be used to clamp a test object controlled by a closed loop with a certain force against the slide and thus fix it for hardness testing. It is provided according to the invention that the measured force supplied as an actual value in a closed loop of a control device and compared with a predetermined setpoint for a defined clamping force, and that depending on the difference between the actual value and the setpoint speed and / or Torque of the drive motor is regulated. The regulation of the speed or the torque of the drive motor can be continuous or unsteady - so in discrete steps - depending on the speed difference. Thus, until the first contact of the Verspannkörpers with the test object, the delivery quickly with relatively high speed of the drive spindle or the drive motor, while after the contact - when the force sensor an increased force is measured - the distortion of the test object on the slide at a significantly reduced speed or reduced torque of the drive motor is performed.
    Depending on the installation position, the force sensor arranged between the spindle nut and the bracing body absorbs tensile or compressive forces during the delivery process. In a stress on train the Verspannkörper is pulled through the spindle nut in the feed direction, ie down, the spindle nut is arranged below the force application region of the Verspannkörpers by the spindle nut. In contrast, when subjected to pressure, the bracing body is pressed by the spindle nut in the feed direction, the spindle nut being arranged above the force application region of the bracing body through the spindle nut.
    The measurement of the impact and clamping forces of the Verspannkörpers on the test object is independent of a possible measurement of the test load. High accuracy - as required for measuring the test load - is not essential for the measurement of impact and strain forces. The force sensor can thus be made relatively simple and inexpensive. Since the Verspannkörper acts on a test surface over a clamping surface, which is much larger than the contact surface between the test specimen and test object, no impact is generated in the surface of the Verspannkörpers the test object and thus does not affect the measurement result.
    The invention will be explained in more detail below with reference to the non-limiting FIGURE.
    FIG. 1 shows a device 1 serving as a hardness tester for producing an impression in a test object 2 for a hardness test. The device 1 has a slide 3 for receiving the test object 2 and a clamping body 4 for clamping the test object 2 on the slide 3. The Verspannkörper 4 is along a guide 5 on the slide 3 relative to the test object 2 by means of a drive motor 6 having a drive device 7 adjustable. The drive device 7 has a helical gear 12 with a threaded spindle 8 and a spindle nut 9. In this case, the drive motor 6 is connected to the rotatably mounted in the slide 3 threaded spindle 8, to which the firmly connected to the Verspannkörper 4 spindle nut 9 acts.
    For applying a test load on the test object 2, the device 1 has a test body 10, which is arranged vertically displaceably in the clamping region 4 a of the Verspannkörpers 4. In Verspannbereich 4a, the Verspannkörper 4 not shown flat clamping jaws, which act over a large area on the test specimen 10 and hold it. The test specimen 10 can be applied to the test load in a known manner via a weight or a load application device acting between the bracing body 4 and the specimen 10 (not shown further).
    In order to be able to measure the impact of the bracing body 4 on the test object 2 and / or the clamping force acting on the test object 2 by the bracing body 4, independently of the test load, at least one force sensor 11 is fastened between the bracing body 4 and the spindle nut 9. The force sensor 11 can be designed both for the absorption of tensile forces and for the absorption of compressive forces. In the exemplary embodiment, the force sensor 11 is loaded upon impact of the Verspannkörpers 4 on the test object 2 and the clamping of the test object 2 to train, wherein the force sensor 11 and the spindle nut 9 is disposed below the force application region 4b of the Verspannkörpers 4 for over the spindle nut 9 transmitting Zustellkräfte. But it is just as possible, the
    Force sensor 11 and the spindle nut 9 to be arranged above the force application region 4b, whereby the force sensor 11 is loaded upon impact of the Verspannkörpers 11 on the test object 2 and during clamping to pressure.
    By the force sensor 11, any change in the force during the delivery and tensioning process is monitored. As a result, an impact of Verspannkörpers 11 is reliably detected on the test object 2 and braked upon reaching a certain threshold strength of Verspannkörper 4 or completely stopped.
    Furthermore, the force sensor 11 can be used to clamp the test object 2 controlled by a closed control loop with a specific tensioning force acting on the test object 2 via the clamping area 4 a and thus to fix it for the hardness test.
    The force measured by the force sensor 11 is supplied, for example, as an actual value in a closed control loop of a control device and compared with a predetermined setpoint value for a defined clamping force. Depending on the difference between the actual value and the desired value, the speed and / or the drive torque of the drive motor 6 can be regulated continuously or discontinuously.
    权利要求:
    Claims (4)
    [1]
    1. Device (1) for producing an impression in a test object (2) for a hardness test, with a slide (3) for receiving the test object (2) and a Verspannkörper (4) for clamping the test object (2) on the slide (3 ), wherein the bracing body (4) along a guide (5) on the slide (3) relative to the test object (2) by means of a drive motor (6) having drive means (7) is adjustable, wherein the drive motor (6) with a rotatably mounted Threaded spindle (8) is connected to which a with the Verspannkörper (4) fixedly connected spindle nut (9) engages, and with a test body (10) for applying a test load on the test object (2), wherein the test body (10) on Verspannkörper (4) is mounted vertically displaceable, characterized in that between the Verspannkörper (4) and the spindle nut (9) at least one force sensor (11) is arranged.
    [2]
    2. Device (1) according to claim 1, characterized in that the force sensor (11) and the drive motor (6) is connected to an electronic control device.
    [3]
    3. A method for producing an impression in a test object (2) for a hardness test, wherein the test object (2) is received on a slide (3) and a Verspannkörper (4) along a guide (5) on the slide (3) the test object (2) by means of a drive device (7) the test object (2) is delivered, wherein the Verspannkörper (4) for clamping the test object (2) on the slide (3) via a threaded spindle (8) and a spindle nut (9) exhibiting helical gear (12) is lowered until the Verspannkörper (4) rests on the test object (2), and wherein after the clamping of the test object (2) relative to Verspannkörper (4) vertically displaceable test body (2) with a defined test load in the test object ( 2) penetrates, characterized in that during the Zustellvorganges and / or the Verspannvorganges between the spindle nut (9) and the Verspannkörper (4) acting force is measured and upon reaching or Übersc width of a defined value, the drive device (7) is braked or stopped.
    [4]
    4. The method according to claim 3, characterized in that the measured force is supplied as an actual value in a closed loop of a control device and compared with a predetermined setpoint for a defined clamping force, and that in dependence on the difference between the actual value and the setpoint speed and / or the torque of the drive motor (6) is controlled.
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    同族专利:
    公开号 | 公开日
    DE102016122160A1|2017-06-01|
    AT517833B1|2017-05-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2804769A|1955-07-29|1957-09-03|Clark Instr Company|Hardness tester work piece clamping means|
    US3877298A|1973-12-13|1975-04-15|Rajendra K Narang|Workpiece clamp and tool shielding device and combination thereof with a tool applying apparatus|
    US4435976A|1981-12-28|1984-03-13|J B Development Corporation|Apparatus for measuring the hardness properties of materials|
    US20030196480A1|2002-04-23|2003-10-23|Rams Rockford Products, Inc.|Hardness tester|
    DE102008034135A1|2008-07-22|2010-01-28|Müller, Fritz|Mark producing method for titanium coating of sample during hardness test, involves terminating pressing process before expiry of application time based on result of comparison of characteristics of analyzed behaviors with threshold value|
    CN101660988A|2009-09-25|2010-03-03|上海大学|Portable on-site Brinell hardness tester|
    US20110132078A1|2009-12-09|2011-06-09|Shaoming Wu|Universal testing machine|
    CN102288500A|2011-05-09|2011-12-21|中国人民解放军装甲兵工程学院|High-precision instrumented indenter and calculation method for indented-in-sample depth of diamond indenting head|
    US20130247645A1|2012-03-26|2013-09-26|Matsuzawa Co., Ltd.|Hardness tester and hardness testing method|
    DE102008034134A1|2008-07-22|2010-01-28|Müller, Fritz|Device for producing impression in investigation material for hardness test, has driving motor that is functionally formed as direct actuating element |CN112985996A|2021-05-12|2021-06-18|江西科技学院|Cement-based material mechanical property detection equipment|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA51005/2015A|AT517833B1|2015-11-25|2015-11-25|DEVICE FOR GENERATING AN IMPRESSION IN A TEST OBJECT FOR HARDNESS TESTING|ATA51005/2015A| AT517833B1|2015-11-25|2015-11-25|DEVICE FOR GENERATING AN IMPRESSION IN A TEST OBJECT FOR HARDNESS TESTING|
    DE102016122160.0A| DE102016122160A1|2015-11-25|2016-11-17|Device for producing an impression in a test object for a hardness test|
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