Automatic measuring machine, production plant and method

Abstract

The invention relates to an automatic measuring machine (10) for automatically determining a respective density of a plurality of solid test pieces (1), comprising a measuring device (2) with a dry weighing device (3) and a wet weighing device (4), a test piece magazine (5) for accommodating a plurality of solid test pieces (1), and a conveying unit (6) for conveying the solid test pieces (1) from the test piece magazine (5) to the measuring device (2), wherein the automatic measuring machine (10) is designed to sequentially convey the solid test pieces (1) to the measuring device (2) using the conveying unit (6), to weigh the solid test pieces (1) using the dry weighing device (3) and the wet weighing device (4) in order to obtain a respective weighing measurement for each solid test piece (1) and to determine a respective density value for each solid test piece (1) on the basis of the respective weighing measurement.

Description

Technical Field

[0001] This invention relates to an automatic measuring machine for determining the density of a solid test piece. This automatic measuring machine is particularly suitable for use in industrial environments, such as production workshops, where the industrial production of solid test pieces is appropriately carried out. Solid test pieces are, for example, workpieces, especially those manufactured by additive manufacturing, particularly 3D printing. The term "solid test piece" should specifically indicate that the test piece is non-flowing. Furthermore, solid test pieces can be workpieces manufactured by sintering, casting, injection molding, or other methods. Summary of the Invention

[0002] The objective of this invention is to provide an automatic measuring machine that enables efficient determination of the density of multiple solid test specimens.

[0003] This task is solved by the automatic measuring machine according to claim 1. The automatic measuring machine is used to automatically determine the respective densities of multiple solid test specimens. The automatic measuring machine includes a measuring device having both a dry weighing device and a wet weighing device. The automatic measuring machine further includes a test specimen library for accommodating multiple solid test specimens. The automatic measuring machine further includes a conveying unit for conveying the solid test specimens from the test specimen library to the measuring device. The automatic measuring machine is configured to sequentially convey the solid test specimens to the measuring device using the conveying unit. The automatic measuring machine is further configured to weigh the solid test specimens using both the dry and wet weighing devices to obtain a corresponding weighing measurement value for each solid test specimen. The automatic measuring machine is further configured to determine a corresponding density value for each solid test specimen based on the corresponding weighing measurement value.

[0004] The described automatic measuring machine can efficiently determine the density of multiple solid test specimens. The automatic measuring machine is specifically configured to determine the density of the solid test specimens in a fully automated manner. In particular, the automatic measuring mechanism is configured to manipulate the solid test specimens in a fully automated manner for density determination.

[0005] Advantageous improvements are the subject of the dependent claims.

[0006] Preferably, the automatic measuring machine includes an automatic measuring machine housing surrounding a workspace, with measuring devices and a test piece library arranged within the workspace.

[0007] Preferably, the automatic measuring machine includes a shock-absorbing suspension that carries the wet weighing device and is configured to attenuate mechanical vibrations from the surrounding environment of the automatic measuring machine in order to reduce the impact of said mechanical vibrations on the weighing measurement value.

[0008] Preferably, the automatic measuring machine includes a frame structure that supports a test specimen library and a transport unit relative to the ground on which the automatic measuring machine is located, and wherein the wet weighing device is decoupled from the vibration of the frame structure.

[0009] Preferably, the automatic measuring machine includes a workspace bottom, with a test piece library located on the bottom of the workspace, wherein the workspace bottom includes a wet weighing sump (Nasswaage-Aussparung), through which a wet weighing structure extends, the wet structure including a shock-absorbing suspension and a wet weighing device.

[0010] Preferably, the test piece library includes multiple test piece carriers, each used to hold a corresponding test piece, and the conveying unit is configured to sequentially extract test piece carriers from the test piece library so as to convey the test pieces in the corresponding test piece carriers to the measuring device.

[0011] Preferably, the automatic measuring mechanism performs the weighing of each test piece in the case of using a dry weighing device and a wet weighing device, wherein the test piece is located within the receiving area of ​​the corresponding test piece carrier.

[0012] Preferably, the dry weighing device and / or the wet weighing device each include a test piece lifting structure that extends into the corresponding test piece carrier during the weighing of the solid test piece, and in particular causes the solid test piece to be lifted relative to the test piece carrier when the corresponding test piece carrier descends.

[0013] Preferably, the wet weighing device includes a basin-shaped component filled with liquid, a first weighing unit disposed outside the basin-shaped component, and a force transmission structure extending from the first weighing unit to the basin-shaped component. The force transmission structure is configured to transmit the force applied to the force transmission structure by the solid test specimen in the liquid to the first weighing unit when the solid test specimen is weighed using the wet weighing device.

[0014] Preferably, the wet weighing device includes a basin-shaped component and a first test piece lifting structure arranged in the basin-shaped component, the first test piece lifting structure extending into the corresponding test piece carrier during the weighing of the solid test piece, and particularly causing the solid test piece to rise relative to the test piece carrier when the corresponding test piece carrier descends.

[0015] Preferably, the wet weighing device includes a basin-shaped component and a liquid level regulating device for adjusting the liquid level in the basin-shaped component.

[0016] Preferably, the automatic measuring mechanism is configured to, in order to weigh the solid test specimen using a wet weighing device, immerse the solid test specimen and the corresponding / said corresponding test specimen carrier together in the liquid of the basin-shaped component, and perform liquid level adjustment after immersing the test specimen carrier.

[0017] Preferably, the wet weighing device includes a basin-shaped component / the basin-shaped component and a surfactant is incorporated into the liquid / the liquid used to fill the basin-shaped component.

[0018] Preferably, the automatic measuring mechanism is configured to determine the density of a solid test piece located at the indicated test piece location determined by the selection information, based on selection information indicating the location of one or more test pieces in a test piece library.

[0019] Preferably, the automatic measuring machine includes an interface, particularly a user interface, for inputting selection information.

[0020] Preferably, multiple solid test pieces manufactured using additive manufacturing are arranged in a test piece library.

[0021] The automatic measuring machine is preferably configured to evaluate the production quality of corresponding solid test pieces based on the determined density values ​​and provide evaluation information.

[0022] The present invention also relates to a manufacturing plant comprising a production workshop, production equipment arranged in the production workshop for producing solid test pieces, and an automated measuring machine arranged in the production workshop as described above.

[0023] The present invention further relates to a method for automatically determining the respective densities of a plurality of solid test specimens, comprising the steps of: conveying solid test specimens from a test specimen library to a measuring device by means of a conveying unit, the measuring device comprising a dry weighing device and a wet weighing device, weighing the solid test specimens using the dry weighing device and the wet weighing device to obtain a corresponding weighing measurement value for each solid test specimen, and determining a corresponding density value for each solid test specimen based on the corresponding weighing measurement value.

[0024] Furthermore, the present invention relates to a method for evaluating the production quality of a solid test piece manufactured by an additive manufacturing method, comprising the steps of: weighing the solid test piece using a dry weighing device and a wet weighing device to obtain a weighing measurement value; evaluating the production quality of the solid test piece based on the weighing measurement value; and providing evaluation information regarding the production quality of the solid test piece. Suitably, the evaluation information indicates whether the solid test piece has achieved a predetermined production quality. Exemplarily, the evaluation information indicates whether the solid test piece has inclusions, such as air inclusions. The solid test piece is, for example, a workpiece. Attached Figure Description

[0025] Further exemplary details and exemplary embodiments are explained below with reference to the figures. In the figures:

[0026] Figure 1 A perspective view of an automatic measuring machine is shown.

[0027] Figure 2 The front view of the automatic measuring machine is shown.

[0028] Figure 3 This shows a perspective view of the automatic measuring machine from above.

[0029] Figure 4 This diagram shows a perspective view of the apparatus consisting of a conveying unit, a test specimen storage unit, a dry weighing device (Trockenwaage-Einrichtung), and a wet weighing device (Nasswaage-Einrichtung).

[0030] Figure 5 The diagram shows a perspective view of the apparatus consisting of a test specimen library, a dry weighing device, and a wet weighing device.

[0031] Figure 6 This shows a perspective view of the test piece library.

[0032] Figure 7 A perspective view of a wet weighing structure with a cover is shown.

[0033] Figure 8 A perspective view of a wet weighing structure without a cover is shown.

[0034] Figure 9 A perspective view showing the basin-shaped component and force transmission structure of a wet weighing device.

[0035] Figure 10 A perspective view of a basin-shaped component with an inserted test specimen carrier and fixture is shown.

[0036] Figure 11 A cross-sectional view of the basin-shaped component of the inserted test specimen carrier and fixture is shown.

[0037] Figure 12 The diagram shows a top view of a basin-shaped component with an inserted test specimen carrier, without clamps or a solid test specimen.

[0038] Figure 13 A perspective view of a dry weighing device is shown.

[0039] Figure 14 A perspective view of a dry weighing apparatus with a placed test specimen carrier and fixture is shown.

[0040] Figure 15The diagram shows a front view of a dry weighing apparatus with a placed test specimen carrier and fixtures.

[0041] Figure 16 A schematic diagram of the production plant is shown, and

[0042] Figure 17 A flowchart illustrating the method is shown.

[0043] In the following text, reference is made to the spatial directions “x-direction,” “y-direction,” and “z-direction” drawn in the diagram, which are orthogonally oriented to each other. The x-direction may also be referred to as the width direction, the y-direction as the depth direction, and the z-direction as the height direction. The x-direction and y-direction are horizontal directions; the z-direction is vertical. Detailed Implementation

[0044] Figures 1 to 3 An automatic measuring machine 10 according to an exemplary embodiment is shown. The automatic measuring machine 10 is specifically configured to perform the automated determination of the corresponding densities of a plurality of solid test specimens 1. The automatic measuring machine 10 includes a measuring device having a dry weighing device 3 and a wet weighing device 4. The automatic measuring machine 10 further includes a test specimen library 5 for accommodating a plurality of solid test specimens 1. The automatic measuring machine 10 further includes a conveying unit 6 for conveying the solid test specimens 1 from the test specimen library 5 to the measuring device 2.

[0045] Preferably, the automatic measuring machine 10 is configured to automatically transport solid test pieces 1 from the test piece library 5 to the measuring device 2 using a conveying unit. In particular, the automatic measuring machine 10 is configured to sequentially transport solid test pieces 1 from the test piece library 5 to the measuring device 2. Specifically, the automatic measuring machine 10 transports solid test pieces 1 individually from the test piece library 5 to the measuring device 2, particularly (in sequence) to the dry weighing device 3 and then to the wet weighing device 4, and then suitably returns them to the test piece library 5. Exemplarily, before the automatic measuring machine 10 transports the next solid test piece 1 to the measuring device 2, the automatic measuring machine 10 ends the transport of solid test pieces 1 to the measuring device 2 and returns them to the test piece library 5.

[0046] The automatic measuring machine 10 is suitably configured to automatically weigh the solid test specimen 1 using both the dry weighing device 3 and the wet weighing device 4, so as to obtain a corresponding weighing measurement value, particularly a dry weighing measurement value and a wet weighing measurement value, for each solid test specimen 1. Preferably, the automatic measuring machine 10 is configured to automatically determine, in particular calculate, a corresponding density value for each solid test specimen 1 based on the corresponding weighing measurement value. According to a preferred design, the automatic measuring machine 10 is configured to perform the transport, weighing, and density determination of the solid test specimen 1 fully automatically, i.e., without user intervention.

[0047] The following will explain other exemplary details:

[0048] The automatic measuring machine 10 is configured, for example, to calculate a density value based on dry and wet weighing measurements when applying Archimedes' principle. For example, the automatic measuring machine 10 is configured to utilize the following relationship:

[0049]

[0050] In this case ρ This is the density of solid test piece 1. ρ w It is the density of liquid 19 in wet weighing device 4. ρ l It is the density of air (e.g., in workspace 8). F l It is the weight of the solid test piece 1 in air on which the dry weighing measurement is based, and F w It is the weight of the solid test piece 1 in water on which the wet weighing measurement is based.

[0051] According to a preferred design, the automatic measuring machine 10 is configured to evaluate the production quality of the corresponding solid test piece 1 based on the determined density values ​​and provide evaluation information. For example, the automatic measuring machine 10 is configured to compare the determined density values ​​with predetermined values, particularly a predetermined range of values, and provide evaluation information based on this comparison. This evaluation information suitably indicates whether the solid test piece has a predetermined density and / or whether it is within a predetermined density range.

[0052] Suitable alternatives to (traditional) production quality evaluation using cross-sectional images are employed, with production quality evaluation based on density values. Specifically, the automatic measuring machine 10 infers, based on density values, whether the solid test piece 1 possesses one or more inclusions, such as air inclusions, and provides evaluation information indicating this. Production quality evaluation based on density values ​​offers particular advantages over traditional cross-sectional image evaluation, as it can be performed non-destructively and / or more quickly.

[0053] The evaluation of production quality is specifically performed on solid test pieces produced through additive manufacturing.

[0054] According to one possible design, the automatic measuring machine 10 includes a first temperature sensor for measuring the temperature of the liquid 19, a second temperature sensor for measuring the temperature of the air in the working space 8, and / or an air pressure sensor for measuring the air pressure in the working space 8. The automatic measuring machine 10 is suitably configured to calculate density by taking into account one or more sensor values ​​detected by means of the first temperature sensor, the second temperature sensor, and / or the air pressure sensor.

[0055] Suitable, the automatic measuring machine 10 is configured to measure 0.5 mg / cm³. 3 Or even lower repeatability and / or 0.1 mg / cm 3 Density can be determined using a smaller resolution.

[0056] The exemplary structure of the automatic measuring machine 10 will be discussed in more detail below. Exemplarily, the automatic measuring machine 10 includes an automatic measuring machine housing 7. The automatic measuring machine 10, and especially the automatic measuring machine housing 7, exemplaryly has a basic cuboid shape, wherein the height is suitably greater than the width and / or depth of the automatic measuring machine, and particularly at least twice the width and / or depth of the automatic measuring machine. For example, the automatic measuring machine, and especially the automatic measuring machine housing 7, has a height of at least 1.60 m and / or a depth and / or width of at least 80 cm.

[0057] Exemplarily, the automatic measuring machine housing 7 includes four peripheral walls: a front wall 31, a rear wall 32, a first side wall 33, and a second side wall 34. Suitably, the peripheral walls can be completely enclosed and are particularly used to protect the measuring device, especially the wet weighing device 4, from air vibrations. The front wall 31 and the rear wall 32 are oriented parallel to each other, particularly perpendicular to the y-direction. The first side wall 33 and the second side wall 34 (in the closed state of the associated door) are oriented parallel to each other, particularly perpendicular to the x-direction. Exemplarily, the automatic measuring machine housing 7 includes a housing bottom 35 from which the four peripheral walls extend upward in the z-direction. The housing bottom is oriented perpendicular to the z-direction. The automatic measuring machine housing 7 further includes a housing cover 36, which suitably forms the upper closure of the automatic measuring machine housing 7, and the peripheral walls extend vertically to the upper closure. The housing cover 36 is oriented perpendicular to the z-direction.

[0058] The front wall 31 exemplaryly includes a front door 37, the first side wall 33 exemplaryly includes a first side door 38, and the second side wall 34 exemplaryly includes a second side door 39. The front door 37, the first side door 38, and / or the second side door 39 are suitably supported in a manner pivotable about a respective pivot axis extending parallel to the z-direction. Figures 1 to 3 The front door 37, the first side door 38, and the second side door 39 are shown in the open state. An equipment opening 44, particularly an equipment hatch, is exemplary located in the front wall 31, especially in the front door 37, through which the automatic measuring machine 10 can be equipped with a solid test piece 1. Suitably, the automatic measuring machine 10 has an opening mechanism for automatically opening and / or closing the equipment opening 44.

[0059] The automatic measuring machine 10 includes a frame structure 11 that supports the dry weighing device 3, the test piece library 5, and / or the conveying unit 6 relative to the ground on which the automatic measuring machine 10 is located. The frame structure 11 is particularly implemented as a base support. The frame structure 11 exemplaryly forms part of the automatic measuring machine housing 7. Exemplarily, the frame structure 11 includes four elongated vertical carrier elements 41 oriented in the Z-direction, said vertical carrier elements preferably implemented as continuously cast profiles, particularly aluminum continuously cast profiles. The vertical carrier elements 41 exemplaryly form the cuboid basic shape of the automatic measuring machine 10 with edges extending parallel to the Z-direction. Exemplarily, support feet 42 are arranged on the bottom surface of the vertical carrier elements 41. Furthermore, the frame structure 11 includes a plurality of elongated horizontal carrier elements 43, exemplaryly at least four, eight, or twelve horizontal carrier elements 43. The horizontal carrier elements 43 are each oriented in the horizontal direction and suitably implemented as continuously cast profiles, particularly aluminum continuously cast profiles. The horizontal carrier element 43 is supported by and particularly fixed to the vertical carrier element 41. Suitably, every four horizontal carrier elements 43 are arranged at the same height and collectively form, in particular, a rectangular or square frame. Preferably, the housing bottom 35 and / or housing cover 36 are supported by the vertical carrier element 41 and / or the horizontal carrier element 43. The automatic measuring machine 10 further includes a workspace bottom 12, which is suitably supported by the vertical carrier element 41 and / or the horizontal carrier element 43.

[0060] The automatic measuring machine 10 includes a workspace 8 in which a test piece library 5, a measuring device 2, particularly a dry weighing device 3 and a wet weighing device 4, and a conveying unit 6 are suitably arranged. Exemplarily, the workspace 8 has a basic cuboid shape. The workspace 8 is surrounded by the automatic measuring machine housing 7, particularly the outer walls. The automatic measuring machine 10 is suitably configured such that, for example, by closing the equipment opening 44, the workspace 8 is placed in a state completely enclosed relative to the surrounding environment of the automatic measuring machine 10. In this state, the wet weighing device 4 is protected from air vibrations. The workspace 8 is bounded downwards by a workspace bottom 12. The test piece library 5 and the dry weighing device 3 are suitably located on the workspace bottom 12. Exemplarily, the workspace 8 occupies at least 30%, particularly at least 50%, of the vertical extension of the automatic measuring machine housing 7. The workspace bottom 12 is exemplary located at at least 20% of the height of the automatic measuring machine housing 7. Preferably, the workspace 8 is located at a working height suitable for a standing user, allowing the standing user to reach into the workspace 8, for example, through the equipment opening 44.

[0061] The workspace 8, surrounded by outer walls, is specifically designed to protect the wet weighing device 4 from air vibrations from the surrounding environment of the automatic measuring machine 10. This prevents measurement results from being interfered with by air vibrations. The test piece library 5, located within the workspace 8, allows for the rapid transport of solid test pieces 1 to the measuring device 2.

[0062] The automatic measuring machine 10 further includes a supply space 45. The supply space 45 is surrounded by the automatic measuring machine housing 7, especially the outer walls. The supply space 45 is located below the workspace 8. Exemplarily, the supply space 45 is boundaryed upward by the bottom 12 of the workspace and suitably boundaryed downward by the bottom 35 of the housing.

[0063] Exemplarily, the automatic measuring machine 10 includes at least one liquid container 46, suitably arranged in a supply space 45. The liquid container 46 suitably contains liquid for the wet weighing device 4 and is suitably fluidly connected to the wet weighing device 4, particularly via a pump. The liquid container 46 is exemplary part of a level regulating device 25.

[0064] According to one possible design, the liquid container 46 is a delivery container, and the automatic measuring machine may additionally include a discharge container, which can be arranged in the supply space 45. The automatic measuring machine is suitably configured to, in particular by means of a liquid level regulating device 25, transport liquid from the delivery container to the basin-shaped member 21 and / or discharge liquid 19 from the basin-shaped member 21 into the discharge container.

[0065] Exemplarily, the automatic measuring machine 10 includes an interface 26, which is particularly implemented as a user interface. Exemplarily, the interface 26 includes a display and / or operating devices. Preferably, the interface 26 includes a touch screen. The interface 26, particularly the user interface, is exemplaryly located outside the automatic measuring machine housing 7, preferably at the height of the workspace 8.

[0066] Preferably, selection information can be input via interface 26, which determines one or more test specimen positions in the test specimen library 5. The automatic measuring machine 10 is suitably configured to determine the density of a solid test specimen 1 located at the test specimen position determined by the selection information based on the selection information.

[0067] Suitablely, the automatic measuring machine 10 is configured to output, in particular display, weighing measurement values ​​and / or density values ​​and / or evaluation information via interface 26.

[0068] Figure 4The diagram illustrates how the measuring device 2, test piece library 5, and conveying unit 6 are arranged relative to each other. Exemplarily, the measuring device 2 and test piece library 5 are located in the same xy plane and are staggered relative to each other in the x and / or y directions. Exemplarily, the test piece library 5 is arranged in the y direction ahead of the measuring device 2. The dry weighing device 3 and the wet weighing device 4 are suitably spaced apart from each other and suitably staggered relative to each other in the x direction. The conveying unit 6 is suitably arranged in the z direction above the bottom 12 of the workspace, particularly above the measuring device 2 and / or the test piece library 5.

[0069] The conveying unit 6 is exemplary implemented as a robotic device, particularly as a gantry robot. Suitably, the conveying unit 6 includes a gripper 47 that is movable in the xy plane and suitably in the z direction. The conveying unit 6 exemplary includes four axes: two horizontal axes, a vertical axis, and a rotational axis extending particularly parallel to the z direction, the horizontal axes being suitably orthogonal to each other and wherein, exemplary, one axis extends parallel to the x-axis and the other axis extends parallel to the y-axis.

[0070] The conveying unit 6 is suitably configured to sequentially extract test specimen carriers 16 from the test specimen library 5 so as to sequentially convey the solid test specimens 1 in the corresponding test specimen carriers 16 to the measuring device 2. In particular, the conveying unit 6 is configured to convey each solid test specimen 1 in the corresponding test specimen carrier to the dry weighing device 3 and the wet weighing device 4 so as to achieve corresponding weighing of the solid test specimen 1 in the test specimen carrier 16. Suitably, the conveying unit 6 is configured to immerse the solid test specimen 1, together with the test specimen carrier 16 and a suitable clamp 47, in the liquid 19 of the wet weighing device 4 in order to weigh the solid test specimen 1 using the wet weighing device 4. The clamp 47 is at least partially immersed in the liquid 19.

[0071] Exemplarily, the conveying unit 6 includes two linear guides 48 extending parallel to each other, particularly parallel to the y-direction. The conveying unit 6 includes a slider, particularly a gantry slider, which can move along the linear guides 48, i.e., particularly in the y-direction. The slider 49 includes a clamping arm 51 and a transverse guide 52 extending orthogonally to the linear guides 48, along which the clamping arm 51 can move. The clamping arm 51 includes a clamp 47, which is suitably movable in the z-direction and / or rotatable about a rotation axis extending parallel to the z-direction.

[0072] Especially in Figure 14 and Figure 15The clamp 47 can be seen in the image. The clamp 47 includes at least one clamping element 53, which can engage with the test specimen carrier 16. Exemplarily, the clamp 47 includes two clamping elements 53, which are suitably implemented in a pin-like manner and / or project downward in the z-direction. Preferably, the transport unit 6 is configured to perform a clamping motion using the clamp 47 to engage the clamping elements 53 with the test specimen carrier 16. The clamping motion includes, in particular, rotation of the clamp 47 about a rotation axis extending parallel to the z-direction. Exemplarily, the clamp 47 includes a clamping plate 54 from which the clamping elements 53 extend downward.

[0073] Figure 5 Show Figure 4 The device does not have a conveying unit 6. The test piece library 5, the dry weighing device 3 and the wet weighing device 4 are arranged in the same xy plane (especially in the workspace 8) and are horizontally offset from each other.

[0074] Figure 6 An exemplary design of the test specimen library 5 is shown in detail. The test specimen library 5 includes multiple test specimen locations, each capable of accommodating a solid test specimen. The test specimen locations are exemplaryly distributed in the xy-plane. Exemplarily, each test specimen location is provided by a corresponding test specimen carrier 16. The test specimen library 5 suitably includes multiple test specimen carriers 16, which are exemplaryly distributed in the xy-plane. Exemplarily, there are at least 5, particularly at least 10, or at least 15 test specimen locations and / or test specimen carriers 16. For better clarity, only the leading test specimen carriers 16 in these figures are respectively equipped with the reference numeral "16".

[0075] Each test specimen carrier 16 is used to contain one, in particular only one, test specimen solid 1. The test specimen carrier 16 is exemplary configured as a transport basket.

[0076] According to a preferred design, a plurality of solid test pieces 1 manufactured by additive manufacturing are arranged in the test piece library 5. The solid test piece 1 is, for example, a workpiece.

[0077] The solid test specimen 1 has a basic shape, such as a cube, sphere, or hemisphere. Alternatively, the solid test specimen 1 can have any basic shape.

[0078] Suitably, each test specimen carrier 16 includes a receiving region 17 for receiving the test specimen solid 1. Exemplarily, the receiving region 17 is implemented as a receiving chamber, particularly as a cylindrical receiving chamber. Each test specimen carrier 16 exemplaryly includes a carrier plate 55, which is oriented with its plate plane particularly perpendicular to the z-direction. An exemplary circular through-hole is provided in each carrier plate 55, which releases the receiving region 17, particularly the receiving chamber. Each receiving region 17 is suitably laterally bounded by a tube segment 56 extending downward from the carrier plate 55. The receiving region 17 is bounded downward by a carrier bottom 57, which is exemplaryly implemented as circular. One or more carrier bottom through-holes 58 are provided in the carrier bottom 57. Particularly in… Figure 12 The bottom through-hole 58 of the carrier can be seen. Exemplarily, the bottom through-hole 58 of the carrier includes a plurality of radially extending slotted through-holes and a centrally located through-hole. The slotted through-holes are exemplary arranged at equal angular intervals and suitably extend to the outer edge of the bottom of the carrier 57. The longitudinal axes of the slotted through-holes suitably intersect at the center of the centrally located through-hole.

[0079] Each test piece carrier 16, and in particular each carrier plate 55, suitably further includes at least one engagement structure 59 and / or at least one fixing structure 61. Exemplarily, two engagement structures 59 are present in each test piece carrier 16, which are suitably implemented as lateral openings in the carrier plate 55. The engagement structures 59 are used to engage with the clamping element 53. Exemplarily, two fixing structures 61 are also present, which are exemplary implemented as through holes in the carrier plate 55. The fixing structures 61 are used to engage with, in particular, pin-shaped fixing elements of the test piece library 5, so as to rotatably fix (about a vertical axis of rotation) such that the test piece carrier 16 does not rotate with the clamping element 53 during the clamping movement of the clamp 47, in which the clamping element 53 engages with the engagement structure 59.

[0080] The test specimen library 5 exemplary includes a receiving section 62 for accommodating test specimen carriers 16. The receiving section 62 is particularly implemented as a tray. The upper side of the receiving section 62 represents an xy receiving plane (oriented perpendicular to the z-direction), in which the test specimen carriers 16 are arranged staggered relative to each other in the x and / or y directions; that is, they do not overlap in the x and y directions. Suitably, pin-shaped fixing elements are arranged on the upper side of the receiving section 62.

[0081] Back Figure 6The test piece library 5 further includes a pull-out section 63, by which the receiving section 62 can be removed from the workspace 8, particularly through the equipment opening 44. Suitably, the pull-out section 63 enables movement of the receiving section 62 in the y-direction. Suitably, the pull-out section 63 includes two pull-out rails 64 arranged parallel to each other, the pull-out rails being oriented particularly parallel to the y-direction. The receiving section 62 is suitably arranged between the two pull-out rails 64.

[0082] The test piece library 5 further includes a handle 65, which can be used by a user to operate the receiving section 62 in order to move the receiving section 62 by means of the pull-out part 63. The handle 65 is exemplary arranged in the y direction in front of the receiving section 62 and suitably arranged in the x direction relative to the receiving section 62 at the center.

[0083] Wet weighing devices 4 will be discussed in more detail later.

[0084] Firstly, for suspending the wet weighing device 4. Exemplarily, the automatic measuring machine 10 includes a wet weighing structure 15, which includes the wet weighing device 4 and a vibration-damping suspension 9. The wet weighing structure 15 is particularly important in... Figure 7 and Figure 8 As shown in the diagram. Exemplarily, the wet weighing device 4 is mounted on a vibration-damping suspension 9. The vibration-damping suspension 9 is suitably mounted on the same ground as the frame structure 11 and / or the automatic measuring machine 10. Exemplarily, the vibration-damping suspension 9 is implemented as a support. The vibration-damping suspension 9 exemplaryly includes a support base 66, from which a plurality of vertical support sections 67 extend vertically upward. The vertical support sections 67 support a support platform 68. The vibration-damping suspension 9 further includes a plurality of support feet 69, which are used to ground the suspension 9. The vibration-damping suspension 9 is exemplary (at least partially) arranged in a supply space 45.

[0085] Suitably, the damping suspension 9 includes at least one damping block 71. Exemplarily, the damping suspension 9 includes an upper damping block 72 and / or a lower damping block 73. The damping blocks 71 are suitably implemented as counterweight plates, preferably as slabs of stone, especially granite, and / or as steel plates. The damping blocks 71 suitably have a strength of at least 2 g / cm³. 3 Preferably, at least 7g / cm 3 The density. The upper damping block 72 is suitably arranged between the support platform 68 and the wet weighing device 4. Exemplarily, the wet weighing device 4 is located on the upper damping block 72 and the upper damping block 72 is located on the support platform 68. Exemplarily, the lower damping block 73 is arranged on the bottom 66 of the support.

[0086] The vibration damping suspension 9 is configured to attenuate mechanical vibrations from the surrounding environment of the automatic weighing machine 10, thereby reducing its impact on the weighing measurement values. Vibration attenuation is achieved, in particular, by means of at least one damping block 71. Suitably, the vibration damping suspension 9 prevents vibrations from the frame structure 11 and the ground on which the vibration damping suspension 9 rests from being transmitted to the wet weighing device 4. The vibration damping suspension 9 is particularly configured to attenuate vibration frequencies above 2 Hz, ensuring that these vibration frequencies do not affect the measurements using the wet weighing device 4.

[0087] The wet weighing device 4 is suspended differently from the dry weighing device 3, the conveying unit 6, and / or the test piece storage 5. While the test piece storage 5, the conveying unit 6, and the dry weighing device 3 are exemplary supported relative to the ground on which the automatic measuring machine 10 is situated using the frame structure 11, the wet weighing device 4 is supported relative to the ground via a vibration-damping suspension (and particularly not via the frame structure 11). The wet weighing device 4 and, in particular, the vibration-damping suspension 9 are suitably decoupled from the vibration of the frame structure 11.

[0088] Exemplary, the bottom 12 of the workspace where the test piece library 5 is located includes a wet weighing recess 14, particularly a through-hole. A wet weighing structure 15 extends through the wet weighing recess 14. The wet weighing structure 15 suitably extends from the supply space 45 into the workspace 8 through the wet weighing recess 14.

[0089] The wet weighing device 4 suitably includes a basin-shaped component 21 in which liquid 19, particularly water, is present. Alternatively, liquid 19 may be ethanol or other liquids. The density of liquid 19 is suitably lower than the density of the solid test piece 1. When weighing the solid test piece 1 using the wet weighing device 4, the solid test piece 1 is suitably immersed, particularly completely immersed, in the liquid 19 within the basin-shaped component 21. Exemplarily, a surfactant is incorporated into the liquid 19, particularly the water. Bubble formation in the liquid 19 can be reduced, particularly prevented, by the surfactant, thereby improving the accuracy of the measurement. The surfactant is suitably silicone-free. Preferably, the surfactant is a mixture of a wetting agent and an antifoaming agent.

[0090] For example, liquid 19, especially water, includes a wetting agent, particularly a silicone-free substrate wetting agent, suitably at a concentration of 0.2% by volume. The substrate wetting agent suitably includes or is composed of an alcohol alkoxylate. A wetting agent is, for example, BYK-DYNWET 800 N from BYK.

[0091] The automatic measuring machine 10 is suitably configured to automatically change the liquid 19, for example, controlled by time and / or the number of measurements.

[0092] The wet weighing device 4 may optionally also include a cover 74 for covering the basin-shaped part 21. Figure 7 The diagram shows a wet weighing device 4 with a cover 74 and... Figure 8 The diagram shows a wet weighing device 4 without the cover 74. The cover 74 is preferably a shield. Exemplarily, the cover has a basic cuboid shape with a particularly open bottom surface. The cover 74 includes an upper side 75, through which a carrier opening 76 is suitably located, through which the test specimen carrier 16 can descend into the basin-shaped member 21. The carrier opening 76 suitably occupies less than one-third of the area of ​​the upper side 75. Exemplarily, the cover 74 includes a closed outer wall 77. The cover 74 suitably covers the basin-shaped member 21. The cover 74 preferably covers the basin-shaped member 21, the force transmission structure 23, and the first weighing unit 22.

[0093] The cover 74 serves as an additional housing for the wet weighing device 4 (in addition to the outer wall of the automatic measuring machine housing 7) and suitably prevents: air movement from causing the liquid 19 in the basin 21 to move and thereby interfere with the measurement.

[0094] The wet weighing apparatus 4 includes a first weighing unit 22, exemplary implemented as a laboratory precision scale. The wet weighing apparatus 4 also exemplaryly includes a basin-shaped support structure 77 supporting the basin-shaped component 21. The first weighing unit 22 and the basin-shaped support structure 77 are suitably located on the same base, exemplary on a particularly plate-shaped wet weighing bottom 78. The wet weighing bottom 78 is exemplary on an upper damping block 72. The first weighing unit 22 includes a first force-absorbing section and is configured to detect the force applied to the first force-absorbing section and provide a weighing measurement, particularly a wet weighing measurement, based on the detected force. The force-absorbing section is particularly arranged on the upper side of the first weighing unit 22. A force transmission structure 23 exemplary extends from the interior of the basin-shaped component 21 to the force-absorbing section. The basin-shaped support structure 77 exemplary extends above the upper side of the first weighing unit 22, particularly above the force-absorbing section. The basin-shaped support structure 77 suitably includes a basin-shaped support plate 79 on which the basin-shaped member 21 is located and which extends above the first weighing unit 21, particularly above the force-absorbing section.

[0095] Figure 9An exemplary design of the basin-shaped member 21 and the force transmission structure 23 is shown in detail. The basin-shaped member 21 is exemplaryly implemented as a cuboid and suitably has an open upper side. The force transmission structure 23 can also be referred to as a skeleton. The force transmission structure 23 is exemplaryly drawn from the interior of the basin-shaped member 21, especially from the liquid 19, from the open upper side of the basin-shaped member 21, and then suitably extends downward below the basin-shaped member 21, especially below the basin-shaped member support plate 79. The force transmission structure 23 includes, in particular, a first closed profile 83 extending from the interior of the basin-shaped member 21, particularly from the liquid 19, and from the open upper side of the basin-shaped member 21, then downward along the outer wall 81 of the first basin-shaped member to below the basin-shaped member 21, particularly below the basin-shaped member support plate 79, then passing below the basin-shaped member 21, particularly below the basin-shaped member support plate 79, and upward along a second outer wall 82 arranged parallel to the outer wall 81 of the first basin-shaped member, extending through the open upper side of the basin-shaped member 21 into the basin-shaped member 21, particularly into the liquid 19. Suitably, the force transmission structure 23 further includes a second closed profile 84 suitably designed to correspond to the first closed profile 83 and suitably arranged horizontally offset relative to the first closed profile 83, particularly offset in the y-direction. The first closed profile 83 and the second closed profile 84 are exemplary connected to each other via, in particular, rod-shaped connecting elements 85 extending particularly parallel to the x-direction.

[0096] Especially in Figure 11 Force transmission structure 23 can be seen. Force transmission structure 23, particularly the first closed profile 83, exemplary includes a structural bottom 86, which is located in the liquid 19, particularly within the basin-shaped member 21. Exemplarily, a first test piece lifting structure 24 extends upward from the structural bottom 86, also located in the liquid 19 within the basin-shaped member 21. Furthermore, internal vertical segments 87 extend vertically upward from the structural bottom 86; more specifically, at least one internal vertical segment 87 extends along the inner side of the outer wall 81 of the first basin-shaped member, and at least one internal vertical segment 87 extends along the inner side of the outer wall 82 of the second basin-shaped member. Exemplarily, every two internal vertical segments 87 are connected to each other via an upper horizontal segment 88, which suitably extends above the basin-shaped member 21. The internal vertical segments 87 protrude from the basin-shaped member 21 and transform into an external vertical segment 89, which extends vertically downward outside the basin-shaped member 21. At least one outer vertical segment 89 extends downward along the outer side of the outer wall 81 of the first basin-shaped member and at least one outer vertical segment 89 extends downward along the outer side of the outer wall 82 of the second basin-shaped member. Every two outer vertical segments 89 are connected via a lower horizontal segment 91, which extends below the basin-shaped member 21, and in particular below the basin-shaped member support plate 79. The lower horizontal segment 91 is suitably coupled to, and in particular connected to, the force-absorbing segment of the first weighing unit 22.

[0097] Suitably, the force transmission structure 23 weighs less than 120g. Suitably, the force transmission structure 23 does not contact the basin-shaped member 21. The force transmission structure 23 is partially located in the liquid 19, for example, together with the structure bottom 86 and the first test piece lifting structure 24.

[0098] The first test piece lifting structure 24 is exemplary implemented as a bed of pins. The first test piece lifting structure 24 suitably includes a plurality of first pins 92, which suitably extend vertically upward from the bottom 86 of the structure.

[0099] The automatic measuring machine 10 is suitably configured to perform weighing of each solid test piece 1 in a state where the solid test piece 1 is located within the receiving area 17 of the corresponding test piece carrier 16 when using the wet weighing device 4. A first test piece lifting structure 24 is used to extend into the corresponding test piece carrier 16 and lift the solid test piece 1 relative to the test piece carrier 16 during the weighing of the solid test piece 1.

[0100] Figure 11 The diagram illustrates a state in which the test specimen carrier 16, containing the solid test specimen 1, is lowered from the transport unit 6 into the liquid 19 within the basin-shaped member 21. The test specimen carrier 16 and the solid test specimen 1 are exemplaryly completely submerged in the liquid 19. Preferably, the automatic measuring machine 10 is configured to perform weighing in this state using a wet weighing device 4 to obtain a wet weighing measurement. A first test specimen lifting structure 24, particularly a pin 92, extends through a through-hole 58 at the bottom of the carrier into the receiving area 17 and supports the solid test specimen 1, such that the solid test specimen 1 is lifted relative to the test specimen carrier 16, particularly the bottom 57 of the carrier, and is no longer supported by the test specimen carrier 16.

[0101] Suitablely, when the test specimen carrier 16 descends into the basin-shaped part 21, the pin 92 passes through the bottom through hole 58 of the carrier into the receiving area 17, so that the solid test specimen lies flat on the pin 92 and does not descend further (together with the test specimen carrier 16).

[0102] According to a preferred design, the automatic measuring machine 10 includes a liquid level regulating device 25 for regulating the liquid level in the basin-shaped component 21. The liquid level regulating device 25 suitably includes a liquid container 46. Preferably, the liquid level regulating device 25 further includes a liquid delivery device, a liquid level sensor device, and / or a basin-shaped component discharge device. The liquid delivery device preferably includes a pump, particularly a micro-geared ring pump, to deliver liquid 19, particularly from the liquid container 46, to the basin-shaped component 21. The liquid level regulating device 25 is configured to detect the actual liquid level in the basin-shaped component 21 using the liquid level sensor device and, based on the actual liquid level and the rated liquid level, particularly when using a liquid delivery device, particularly a micro-geared ring pump, perform liquid level regulation. Suitably, the liquid level regulating device 25 is configured to perform liquid level regulation without air bubbles, particularly by means of a micro-geared ring pump.

[0103] Suitablely, the automatic measuring machine 10 is configured such that, in order to weigh the solid test piece 1 using the wet weighing device 4, the solid test piece 1 and the corresponding test piece carrier 16 are immersed together in the liquid 19 of the basin-shaped member 21, and after the test piece carrier 16 is immersed, the liquid level is adjusted, particularly by means of the liquid level adjustment device 25. The automatic measuring machine 10 is particularly configured to perform the liquid level adjustment before detecting the wet weighing measurement value.

[0104] Suitablely, the automatic measuring machine 10 is configured to compensate for the change in liquid level when the test piece carrier 16 and / or clamp 47 are immersed in the liquid 19 in the basin 21, thereby affecting the wet weighing measurement value.

[0105] refer to Figures 13 to 15 The dry weighing device 3 will now be discussed in more detail. The dry weighing device 3 includes a second weighing unit 93, which is exemplary implemented as a laboratory precision scale. The second weighing unit 93 includes a second force-absorbing section 94 and is configured to detect the force applied to the second force-absorbing section 94 and provide a weighing measurement, particularly a dry weighing measurement, based on the detected force. The second force-absorbing section 94 is particularly arranged on the upper side of the second weighing unit 93. Exemplarily, a second test piece lifting structure 95 is arranged on the second force-absorbing section 94. The second test piece lifting structure 95 is exemplary implemented as a bed of pins. The second test piece lifting structure 95 suitably includes a second structural bottom 96, particularly implemented in a plate-like form, and a plurality of second pins 97, which suitably extend vertically upward from the second structural bottom 96.

[0106] Suitablely, the automatic measuring machine 10 is configured to perform the weighing of each solid test piece 1 in a state where the solid test piece 1 is located within the receiving area 17 of the corresponding test piece carrier 16 when using the dry weighing device 3. The second test piece lifting structure 95 is configured to extend into the corresponding test piece carrier 16 and lift the solid test piece 1 relative to the test piece carrier 16 during the weighing of the solid test piece 1.

[0107] Figure 15 The following state is shown, in which the test specimen carrier 16, containing the solid test specimen 1, is lowered from the transport unit 6 onto the second test specimen lifting structure 95. The automatic measuring machine 10 is preferably configured such that, in this state, weighing is performed using a dry weighing device 3 to obtain a dry weighing measurement. The second test specimen lifting structure 95, particularly the pin 97, extends through the bottom through-hole 58 of the carrier into the receiving area 17 and supports the solid test specimen 1, such that the solid test specimen 1 is lifted relative to the test specimen carrier 16, particularly the bottom 57 of the carrier, and is no longer supported by the test specimen carrier 16. Suitably, as the test specimen carrier 16 descends, the pin 92 extends through the bottom through-hole 58 into the receiving area 17, such that the solid test specimen 1 lies flat on the pin 92 and does not descend further (together with the test specimen carrier 16).

[0108] Figure 16 A production plant 20 is shown, which includes a production workshop 27, such as a building lobby. Production plant 20 is particularly an industrial production plant. Production plant 20 includes an automated measuring machine 10, which is suitably implemented as described herein. Production plant 20 further includes production equipment 28 for producing solid test pieces 1, such as workpieces. Production equipment 28 is configured, for example, to manufacture solid test pieces 1 by additive manufacturing. For example, production equipment 28 includes a 3D printer for producing solid test pieces 1.

[0109] Production equipment 28 and automatic measuring machine 10 are suitably located on the same ground, especially on the ground of production workshop 27.

[0110] The production plant 20 preferably also includes a loading unit 98 for loading the solid test piece 1 manufactured using the production equipment 28 into the automatic measuring machine 10. The loading unit is, for example, a robot unit.

[0111] The automatic measuring machine 10 is suitably configured to measure the weight of each solid test piece 1, particularly wet and dry weight measurements. The automatic measuring machine 10 is also suitably configured to evaluate the production quality of the solid test piece 1 based on the weight measurements and provide corresponding evaluation information.

[0112] According to one possible implementation, the production equipment 28 is configured to adapt to the manufacture of solid test pieces based on evaluation information. For example, a communication connection exists between the automatic measuring machine 10 and the production equipment 28, via which the evaluation information is transmitted.

[0113] refer to Figure 17 The operation of the automatic measuring machine 10 will be discussed below. Figure 17 A flowchart of method 30 is shown, according to which an automatic measuring machine can be operated. Method 30 can also be referred to as a measurement process.

[0114] Suitably, the automatic measuring machine 10 includes a control unit, particularly a computer unit, such as a microcontroller, which controls the operation and, more particularly, the steps described below. Specifically, the control unit is configured to control the automated operation of the automatic measuring machine 10. Suitably, the control unit is configured to operate the conveying unit 6 to cause the conveying of the solid test piece 1. Furthermore, the control unit is suitably configured to operate the liquid level regulating device 25 to achieve liquid level regulation. Furthermore, the control unit is configured to communicate with the dry weighing device 3 and the wet weighing device 4 to suitably read the dry weighing measurement value and the wet weighing measurement value. Suitably, the control unit is further configured to calculate the density value based on the dry weighing measurement value and the wet weighing measurement value.

[0115] The method begins with step P1, in which multiple solid test pieces 1 are loaded into the automatic measuring machine 10, and more particularly into the test piece library 5. For example, the receiving section 62 is manually pulled out from the workspace 8 through the equipment opening 44 by means of handle 65 and the solid test piece 1 is loaded into the test piece position, and more particularly into the test piece carrier 16.

[0116] According to one possible design, loading is performed automatically. Alternatively, loading may be performed in such a way that the receiving section 62, already loaded with the solid test piece 1, is transported, in particular, automatically into the automatic measuring machine 10.

[0117] The method continues with an optional step P2, in which selection information is provided to the automatic measuring machine 10, indicating the location of one or more test specimens in the test specimen library 5. The automatic measuring machine 10 is configured to perform density determination for a solid test specimen 1 located at the test specimen location determined by the selection information.

[0118] For example, selection information can be input by the user, particularly via interface 26. For example, interface 26 displays a representation of the test piece position (e.g., a checkerboard pattern), and the user can select the test piece position by touching the indicated test piece position, for which density should be determined.

[0119] According to one possible design, the automatic measuring machine 10 is configured to automatically detect, for example, which positions of the testing machine are occupied by the solid test piece, using an optical sensor system.

[0120] Step P2 may also be performed before or in parallel with step P1.

[0121] Method 30 continues with measurement sub-process 40. Suitably, the automatic measuring machine 10 is configured to perform its own measurement sub-process 40 for each solid test specimen (for which density determination should be performed).

[0122] The measurement subprocess 40 includes step UP1, in which the transport unit 6 receives the first test piece carrier 16. Suitably, the automatic measuring machine 10 is configured to automatically receive the first test piece carrier 16 by means of the transport unit 6, for example, by automatically moving the clamp 47 to the first test piece carrier 16, for example by performing a clamping motion to engage the clamp with the first test piece carrier 16, and then removing the test piece carrier 16 from the test piece library 5, especially from the receiving section 62.

[0123] The measurement subprocess 40 further includes step UP2, in which the first solid test piece 1 located in the first test piece carrier 16 is weighed using the dry weighing device 3. Suitably, the automatic measuring machine 10 is configured to move the first solid test piece 1 in the first test piece carrier 16 to the dry weighing device 3 by means of a conveying unit 6, preferably by moving the clamp 47 in the x and / or y directions. Suitably, the automatic measuring machine 10 is further configured to lower the first test piece carrier 16 onto the dry weighing device 3 by means of the conveying unit 6. Suitably, as the test piece carrier 16 is lowered, a second test piece lifting structure 95 extends into the receiving area 17 of the first test piece carrier 16 and lifts the first solid test piece 1 relative to the first test piece carrier 16. The force exerted by the first solid test piece 1 on the second test piece lifting structure 95 is transmitted to the second force absorption section 94 and detected by the second weighing unit 93 as a dry weighing measurement value.

[0124] The measurement subprocess 40 further includes step UP3, in which the first solid test piece 1 located in the first test piece carrier 16 is weighed using the wet weighing device 4. Suitably, the automatic measuring machine 10 is configured to move the first solid test piece 1 in the first test piece carrier 16 to the wet weighing device 4 by means of a conveying unit 6, preferably by moving the clamp 47 in the x and / or y directions. Suitably, the automatic measuring machine 10 is further configured to lower the first test piece carrier 16 into the basin-shaped member 21, particularly the liquid 19, by means of the conveying unit 6. Suitably, as the first test piece carrier 16 is lowered, the first test piece lifting structure 24 extends into the receiving area of ​​the first test piece carrier 16 and lifts the first solid test piece 1 relative to the first test piece carrier 16. The force applied by the first solid test piece 1 to the first test piece lifting structure 24 is transmitted to the first force absorption section via the force transmission structure 23 and detected by the first weighing unit 22 as a wet weighing measurement value.

[0125] Suitably, the automatic measuring machine 10 is configured to adjust the liquid level of the basin-shaped member 21 after the first test piece carrier 16 is immersed in the liquid 19. Suitably, the liquid level adjustment is performed before detecting the wet weighing measurement value. In particular, the liquid level adjustment is performed before the first solid test piece 1 is lowered onto the first test piece lifting structure 24. Suitably, the automatic measuring machine 10 is configured to zero the first weighing unit 22 after adjusting the liquid level and before the first solid test piece 1 is lowered onto the first test piece lifting structure 24.

[0126] The measurement subprocess 40 further includes step UP4, in which the density value of the first solid test piece 1 is calculated based on the dry weighing measurement value and the wet weighing measurement value. In particular, the automatic measuring machine 10 is configured to calculate the density value according to Archimedes' principle. Suitably, the automatic measuring machine 10 provides the calculated density value as density information.

[0127] The measurement subprocess 40 further includes step UP5, in which the conveying unit 6 returns the first test piece carrier 16 back to the test piece library 5. Suitably, the automatic measuring machine 10 is configured to automatically return the first test piece carrier 16 back to the test piece library 5 by means of the conveying unit 6, for example, by automatically moving the clamp 47 to the test piece library 5, lowering the first test piece carrier 16 into the receiving section 62, and, in particular, by the rotational movement of the clamp 47, loosening the engagement with the first test piece carrier 16.

[0128] Step UP5 may also be performed before or in parallel with step UP4.

[0129] Suitablely, the automatic measuring machine 10 is configured to perform the steps of the measurement sub-process 40 fully automatically, i.e., without user intervention. Suitablely, the automatic measuring machine 10 is configured to perform the measurement sub-process for the solid test piece 1 in two minutes or less.

[0130] Method 30 now continues with step P3, in which the automatic measuring machine 10 selects the next (second) solid test piece 1 to be measured. The method then performs another measurement sub-process 40, more specifically for the second test piece carrier 16, in which the next (second) solid test piece 1 to be measured is located.

[0131] Suitablely, the automatic measuring machine 10 is configured to perform a measurement subprocess 40 for other solid test pieces 1 to be measured until the density is determined for all solid test pieces 1 stored in the solid library 5 and / or for all solid test pieces 1 indicated by the selection information.

[0132] Method 30 then continues with step P4, in which method 30 ends. For example, in step P4, the solid test specimen 1 is extracted from the automatic measuring machine 10 and / or is classified, in particular automatically, according to the obtained density value.

Claims

1. An automatic measuring machine (10) for automatically determining the density of a plurality of solid test specimens (1), said automatic measuring machine comprising: - A measuring device (2) having a dry weighing device (3) and a wet weighing device (4). - A test piece library (5) for accommodating the plurality of solid test pieces (1), and - A conveying unit (6) for conveying the solid test piece (1) from the test piece library (5) to the measuring device (2), wherein - The automatic measuring machine (10) is configured to sequentially transport the solid test piece (1) to the measuring device (2) using the conveying unit (6), weigh the solid test piece (1) using the dry weighing device (3) and the wet weighing device (4) to obtain a corresponding weighing measurement value for each solid test piece (1) and determine a corresponding density value for each solid test piece (1) based on the corresponding weighing measurement value. The test specimen library (5) includes multiple test specimen carriers (16), each of which is used to hold a corresponding solid test specimen (1), and the conveying unit (6) is configured to sequentially extract the test specimen carriers (16) from the test specimen library (5) so as to convey the solid test specimen (1) in the corresponding test specimen carrier (16) to the measuring device (2). The dry weighing device (3) and the wet weighing device (4) respectively include a test piece lifting structure (18), which extends into the corresponding test piece carrier (16) during the weighing of the solid test piece (1) and causes the solid test piece (1) to be lifted relative to the test piece carrier (16).

2. The automatic measuring machine (10) according to claim 1, wherein the automatic measuring machine (10) is configured to perform the weighing of each solid test piece (1) in a state in which the solid test piece (1) is located within the receiving area (17) of the corresponding test piece carrier (16) when using the dry weighing device (3) and the wet weighing device (4).

3. The automatic measuring machine (10) according to claim 1 or 2, wherein the test piece lifting structure (18) causes the solid test piece (1) to be lifted relative to the test piece carrier (16) when the corresponding test piece carrier (16) is lowered.

4. The automatic measuring machine (10) according to claim 1 or 2, wherein the automatic measuring machine (10) includes an automatic measuring machine housing (7) surrounding a workspace (8), wherein the measuring device (2) and the test piece library (5) are arranged in the workspace.

5. The automatic measuring machine (10) according to claim 1 or 2, further comprising a vibration damping suspension (9) that carries the wet weighing device (4) and is configured to attenuate mechanical vibrations from the surrounding environment of the automatic measuring machine (10) in order to reduce the impact of the mechanical vibrations on the weighing measurement value.

6. The automatic measuring machine (10) according to claim 5, wherein the automatic measuring machine includes a frame structure (11) that supports the test piece library (5) and the conveying unit (6) relative to the ground on which the automatic measuring machine (10) is located, and wherein the wet weighing device (4) is vibration decoupled from the frame structure (11).

7. The automatic measuring machine (10) according to claim 5, further comprising a workspace bottom (12) on which the test piece library (5) is located, wherein the workspace bottom includes a wet weighing clearance (14) through which a wet weighing structure including the vibration damping suspension (9) and the wet weighing device (4) extends.

8. The automatic measuring machine (10) according to claim 6, further comprising a workspace bottom (12) on which the test piece library (5) is located, wherein the workspace bottom includes a wet weighing clearance (14) through which a wet weighing structure including the vibration damping suspension (9) and the wet weighing device (4) extends.

9. The automatic measuring machine (10) according to claim 1 or 2, wherein the wet weighing device (4) comprises a basin-shaped part (21) filled with liquid (19), a first weighing unit (22) disposed outside the basin-shaped part (21), and a force transmission structure (23) extending from the first weighing unit (22) to the basin-shaped part (21), the force transmission structure being configured such that, when the solid test piece (1) is weighed using the wet weighing device (4), the force applied to the force transmission structure (23) by the solid test piece (1) in the liquid (19) is transmitted from the basin-shaped part (21) to the first weighing unit (22).

10. The automatic measuring machine (10) according to claim 1 or 2, wherein the wet weighing device (4) includes a basin-shaped part (21) and a first test piece lifting structure (24) arranged in the basin-shaped part (21), the first test piece lifting structure extending into a corresponding test piece carrier (16) during the weighing of the solid test piece (1) and causing the solid test piece (1) to be lifted relative to the test piece carrier (16).

11. The automatic measuring machine (10) according to claim 10, wherein the first test piece lifting structure (24) causes the solid test piece (1) to be lifted relative to the test piece carrier (16) when the corresponding test piece carrier (16) is lowered.

12. The automatic measuring machine (10) according to claim 1 or 2, wherein the wet weighing device (4) includes a basin-shaped part (21) and a liquid level regulating device (25) for regulating the liquid level of the basin-shaped part (21).

13. The automatic measuring machine (10) according to claim 12, wherein the automatic measuring machine (10) is configured to, in order to weigh the solid test piece (1) using the wet weighing device (4), immerse the solid test piece (1) together with the corresponding test piece carrier (16) in the liquid (19) of the basin-shaped piece (21) and perform the liquid level adjustment after the immersion of the test piece carrier (16).

14. The automatic measuring machine (10) according to claim 1 or 2, wherein the wet weighing device (4) comprises a basin-shaped part (21) and a surfactant is incorporated into the liquid (19) used to fill the basin-shaped part (21).

15. The automatic measuring machine (10) according to claim 1 or 2, wherein the automatic measuring machine (10) is configured to perform density determination for a solid test piece (1) based on selection information indicating the location of one or more test pieces in the test piece library (5), the solid test piece being located at the indicated test piece location determined by the selection information.

16. The automatic measuring machine (10) according to claim 15, wherein the automatic measuring machine (10) includes an interface (26) for inputting the selection information.

17. The automatic measuring machine (10) according to claim 16, wherein the interface (26) is a user interface.

18. The automatic measuring machine (10) according to claim 1 or 2, wherein a plurality of solid test pieces (1) manufactured by additive manufacturing are arranged in the test piece library (5).

19. The automatic measuring machine (10) according to claim 1 or 2, wherein the automatic measuring machine (10) is configured to evaluate the production quality of the corresponding solid test piece (1) based on the determined density value and provide evaluation information.

20. A production plant (20) comprising a production workshop (27), production equipment (28) arranged in the production workshop (27) for producing solid test pieces (1) and an automatic measuring machine (10) arranged in the production workshop according to any one of claims 1 to 19.

21. A method (30) for automatically determining the respective densities of a plurality of solid test specimens (1), wherein the method is performed using an automatic measuring machine (10) according to any one of claims 1 to 19, the method comprising the steps of: - The solid test piece (1) is transported from the test piece library (5) to the measuring device (2) by means of the conveying unit (6), the measuring device including a dry weighing device (3) and a wet weighing device (4). - Weigh the solid test specimen (1) using the dry weighing device (3) and the wet weighing device (4) to obtain a corresponding weighing measurement value for each solid test specimen (1), and - For each solid test specimen (1), the corresponding density value is determined based on the corresponding weighing measurement.

22. A method for evaluating the production quality of a solid test piece (1) manufactured by an additive manufacturing method, wherein the method is performed using an automatic measuring machine (10) according to any one of claims 1 to 19, the method comprising the following steps: The solid test piece (1) is weighed using a dry weighing device (3) and a wet weighing device (4) to obtain a weighing measurement value. The production quality of the solid test piece (1) is evaluated based on the weighing measurement value, and Provide evaluation information on the production quality of the solid test piece (1).

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