Holding device for holding a workpiece to be machined

Abstract

The invention relates to a holding device for holding a workpiece to be machined, comprising a clamping unit for clamping the workpiece to be machined and a fastening unit for fastening the holding device to a column, wherein the clamping unit has at least one guide bolt which projects into at least one guide opening of the fastening unit, and wherein, in a released state, the at least one guide bolt is movable in a longitudinal direction relative to the guide opening, and wherein, in a locked state, the at least one guide bolt is fixed in the guide opening.

Description

[0001] Holding device for holding a workpiece to be machined

[0002] Description:

[0003] The invention relates to a holding device for holding a workpiece to be machined, which comprises a clamping unit for clamping the workpiece to be machined and a fastening unit for fastening the holding device to a column.

[0004] Drives for machines consist of an electric motor and a mechanical gearbox. The electric motor drives the machine via the gearbox. The gearbox comprises several meshing gears arranged in a housing. The housing comprises several housing parts that are connected to each other and surround a cavity. The gears are arranged in the cavity.

[0005] During transmission manufacturing in a production plant, housing parts are produced and further processed at a workstation. For example, holes for shafts are drilled into a housing part at the workstation. The housing parts to be machined are held at the workstation by holding devices during processing.

[0006] A device for clamping workpieces is known from DE 102004 013 560 B3.

[0007] From EP 2 147 749 A1 a device for releasably securing a part to a support device is known.

[0008] From DE 102013 001 759 B3 a clamping device for clamping workpieces with a central part in the form of a clamping tower is known.

[0009] A clamping device for workpieces is known from AT 315607 B.

[0010] A holding device for holding a workpiece is known from CN 108098389 A. The invention is based on the object of improving a holding device for holding a workpiece to be machined, for example, a housing part of a gearbox.

[0011] The object is achieved by a holding device having the features specified in claim 1. Advantageous embodiments and further developments are the subject of the subclaims.

[0012] A holding device according to the invention for holding a workpiece to be machined comprises a clamping unit for clamping the workpiece to be machined and a fastening unit for fastening the holding device to a column. The clamping unit has at least one guide pin, which projects into at least one guide opening of the fastening unit. In a released state, the at least one guide pin is movable in a longitudinal direction relative to the guide opening, and in a locked state, the at least one guide pin is fixed in the guide opening.

[0013] Preferably, a workstation comprises three fixed holding elements and a holding device according to the invention for holding the workpiece to be machined. The three fixed holding elements statically fix the workpiece at three points on the workstation. The holding device according to the invention holds the workpiece to be machined at an additional fourth point, allowing for longitudinal compensation. The holding device according to the invention thus allows the workpiece to be machined to be held at the workstation without play or tension.

[0014] According to an advantageous embodiment of the invention, at least one fixing screw is arranged on the fastening unit, by means of which the at least one guide pin can be fixed in the guide opening. The at least one fixing screw can be screwed vertically into the fastening unit. By tightening the fixing screw, the locked state is established, in which the at least one guide pin is fixed in the guide opening. By loosening the fixing screw, the released state is established, in which the at least one guide pin is movable relative to the guide opening.

[0015] According to an advantageous development of the invention, the clamping unit comprises a primary guide pin, which projects into a primary guide opening of the fastening unit, and a secondary guide pin, which projects into a secondary guide opening of the fastening unit. The guide pins are arranged offset from one another in a transverse direction.

[0016] According to a preferred embodiment of the invention, the clamping unit comprises an intermediate element, to which the at least one guide pin is fastened, and a clamping element. The intermediate element is arranged longitudinally between the fastening unit and the clamping element, and the workpiece to be machined can be clamped between the intermediate element and the clamping element.

[0017] According to an advantageous embodiment of the invention, the clamping unit has a clamping screw by means of which the clamping element can be clamped longitudinally toward the intermediate element. The clamping screw extends through the clamping element and penetrates the intermediate element.

[0018] According to a preferred embodiment of the invention, an elongated hole extending in the transverse direction is provided in the clamping element. The clamping screw extends through the elongated hole.

[0019] According to an advantageous development of the invention, the clamping unit has a support element that protrudes longitudinally from the intermediate element on a side facing away from the at least one guide pin. The clamped workpiece rests against the support element and the clamping element. The support element has a soft coating on a surface facing the clamping element. This prevents damage, such as scratches, to the workpiece.

[0020] According to an advantageous embodiment of the invention, the support element is movable longitudinally relative to the intermediate element. This allows for fine adjustment of the holding device for aligning the workpiece longitudinally.

[0021] According to an advantageous embodiment of the invention, the clamping unit has a support bolt that protrudes longitudinally from the intermediate element on a side facing away from the at least one guide bolt. When the workpiece is clamped, the clamping element rests against the support bolt. According to an advantageous embodiment of the invention, the support bolt is movable longitudinally relative to the clamping element. This allows alignment of the clamping element relative to the intermediate element.

[0022] According to a preferred embodiment of the invention, the clamping screw is arranged in the transverse direction between the support element and the support bolt.

[0023] According to an advantageous embodiment of the invention, the support bolt is designed in the form of a screw and is screwed into a bore in the secondary guide bolt. The support bolt is movable in the longitudinal direction by rotation relative to the intermediate element.

[0024] According to an advantageous embodiment of the invention, a fastening screw extends through the fastening unit, and a through-hole is provided in the intermediate element. The through-hole is aligned with the fastening screw when the guide pins of the clamping unit extend into the guide holes of the fastening unit.

[0025] The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0026] The invention will now be explained in more detail with reference to the accompanying drawings. The invention is not limited to the exemplary embodiments shown in the drawings. The drawings only represent the subject matter of the invention schematically. They show:

[0027] Figure 1 : an exploded view of a holding device and

[0028] Figure 2: a perspective view of a workstation.

[0029] Figure 1 shows an exploded view of a holding device 10 for holding a workpiece 1 to be machined. The holding device 10 is part of a workstation at which workpieces 1, in particular gear housing parts, are machined. The holding device 10 is attached to a column 12, which is also part of the workstation.

[0030] The holding device 10 comprises a fastening unit 8, by means of which the holding device 10 is fastened to the column 12. The column 12 has a fastening groove 84 which extends in a vertical direction Z. Within the fastening groove 84, a nut (not shown here) is arranged such that it can be displaced in the vertical direction Z. A fastening screw 82 passes through the fastening unit 8 and penetrates the nut. By tightening the fastening screw 82, the fastening unit 8 can be locked to the column at a defined height in the vertical direction Z.

[0031] The holding device 10 comprises a clamping unit for clamping the workpiece 1 to be machined. The clamping unit has an intermediate element 5 and a clamping element 2. The intermediate element 5 is arranged in a longitudinal direction X between the fastening unit 8 and the clamping element 2. The workpiece 1 to be machined is clamped between the intermediate element 5 and the clamping element 2.

[0032] The clamping unit has a primary guide pin 6 and a secondary guide pin 7. The guide pins 6, 7 are attached to the intermediate element 5 and protrude away from the intermediate element 5 in the longitudinal direction X. The guide pins 6, 7 are circularly cylindrical. The guide pins 6, 7 are offset from one another in a transverse direction Y. The longitudinal direction X runs perpendicular to the transverse direction Y. The longitudinal direction X runs perpendicular to the vertical direction Z. The vertical direction Z runs perpendicular to the transverse direction Y.

[0033] A primary guide opening 86 and a secondary guide opening 87 are formed in the fastening unit 8. The guide openings 86, 87 have a circular cross-section and are offset from one another in the transverse direction Y. The guide openings 86, 87 extend parallel to one another in the longitudinal direction X.

[0034] The primary guide pin 6 of the clamping unit protrudes into the primary guide opening 86 of the fastening unit 8. The secondary guide pin 7 of the clamping unit protrudes into the secondary guide opening 87 of the fastening unit 8.

[0035] Two fixing screws 9 are arranged on the fastening unit 8. The fixing screws 9 run parallel to each other and are screwed into the fastening unit 8 in the vertical direction Z. The fixing screws 9 can be used to fix the primary guide pin 6 in the primary guide opening 86.

[0036] By tightening the fixing screws 9, a locked state is created in which the primary guide pin 6 is fixed in the primary guide opening 86. By loosening the fixing screws 9, a released state is created in which the primary guide pin 6 is movable relative to the primary guide opening 86.

[0037] A through-opening 52 is provided in the intermediate element 5. When the guide pins 6, 7 of the clamping unit protrude into the guide openings 86, 87 of the fastening unit 8, the through-opening 52 is aligned with the fastening screw 82. The fastening screw 82 is thus still accessible through the through-opening 52, even when the intermediate element 5 is fixed to the fastening unit 8.

[0038] The clamping unit has a clamping screw 4. The clamping screw 4 extends through the clamping element 2 in the longitudinal direction X and penetrates into a clamping opening 54 of the intermediate element 5. An elongated hole 24 is provided in the clamping element 2 and extends in the transverse direction Y. The clamping screw 4 passes through the elongated hole 24. By tightening the clamping screw 4, the clamping element 2 can be clamped in the longitudinal direction X towards the intermediate element 5. The clamping unit has a support element 3. The support element 3 protrudes from the intermediate element 5 in the longitudinal direction X on a side facing away from the guide bolts 6, 7. The support element 3 is in the form of a screw and is screwed into a bore in the intermediate element 5. By turning, the support element 3 can be moved relative to the intermediate element 5 in the longitudinal direction X.

[0039] The clamped workpiece 1 rests against the support element 3 and the clamping element 2. By rotating the support element 3 relative to the intermediate element 5, a fine adjustment of the holding device 10 is possible for aligning the workpiece to be machined in the longitudinal direction X.

[0040] The support element 3 has a soft coating on a surface facing the clamping element 2. This coating, which contacts the clamped workpiece 1, prevents damage, such as scratches, to the clamped workpiece 1.

[0041] The clamping unit has a support pin 57. The support pin 57 protrudes from the intermediate element 5 in the longitudinal direction X on a side facing away from the guide pins 6, 7. The support pin 57 is designed in the form of a screw and is screwed into a bore in the secondary guide pin 7. By rotating, the support pin 57 is movable relative to the intermediate element 5 in the longitudinal direction X.

[0042] When the workpiece 1 is clamped, the clamping element 2 rests against the support pin 57. By rotating the support pin 57 relative to the secondary guide pin 7, the clamping element 2 can be aligned relative to the intermediate element. The clamping screw 4 is arranged in the transverse direction Y between the support element 3 and the support pin 57.

[0043] Figure 2 shows a perspective view of a workstation. The workstation is located in a production plant for the manufacture of gearboxes. In the production plant, housing parts are produced and further processed at the workstation. A workpiece 1 is held at the workstation shown here. The workpiece 1 is a housing part of a gearbox. At the workstation, for example, holes for the passage of shafts are made in the workpiece 1. The workstation comprises two columns 12 and a base 22. The two columns 12 are attached to the base 22 and protrude from the base 22 in the vertical direction Z. The two columns 12 are arranged offset from one another in the transverse direction Y.

[0044] The workstation comprises three fixed holding elements 20 on which the workpiece 1 is held. Two of the three holding elements 20 are offset from one another in the vertical direction Z and fastened in a fastening groove 84 of one of the columns 12. One of the three holding elements 20 is fastened in a fastening groove 84 of the other column 12. The workstation further comprises a holding device 10 shown in Figure 1. The holding device 10 is fastened in the fastening groove 84 of one of the columns 12 and offset from one of the holding elements 20 in the vertical direction Z.

[0045] To hold the workpiece 1 to be machined at the workstation, the workpiece 1 is first attached to the three fixed holding elements 20. The three fixed holding elements 20 then statically fix the workpiece 1 at three points on the workstation.

[0046] The workpiece 1 is then secured to the holding device 10. First, the holding device 10 is locked at the desired height in the vertical direction Z on the column 12. To do this, the fastening screw 82, which penetrates a nut in the fastening groove 84 of the column 12, is tightened.

[0047] The holding device 10 is arranged such that the workpiece 1 is located between the intermediate element 5 and the clamping element 2. The clamping screw 4 is then tightened, whereby the clamping element 2 is clamped in the longitudinal direction X toward the intermediate element 5. As a result, the workpiece 1 to be machined is clamped between the intermediate element 5 and the clamping element 2.

[0048] The guide pins 6, 7, which extend into the guide openings 86, 87 of the fastening unit 8, are automatically adjusted in the longitudinal direction X such that the workpiece 1 is held free of play and tension. The fixing screws 9 are then tightened, thereby securing the primary guide pin 6 in the primary guide opening 86. This additionally holds the workpiece 1 to be machined at a fourth point. Thus, the workpiece 1 to be machined is held free of play and tension at four points on the columns 12 of the workstation by means of the holding elements 20 and the holding device 10.

[0049] List of reference symbols

[0050] 1 workpiece

[0051] 2 clamping element

[0052] 3 Support element

[0053] 4 clamping screw

[0054] 5 Intermediate element

[0055] 6 primary guide pin

[0056] 7 secondary guide pin

[0057] 8 Mounting unit

[0058] 9 Fixing screw

[0059] 10 Holding device

[0060] 12 pillar

[0061] 20 holding element

[0062] 22 Base

[0063] 24 slot

[0064] 52 passage opening

[0065] 54 clamping opening

[0066] 57 support bolts

[0067] 82 fixing screw

[0068] 84 Mounting groove

[0069] 86 primary guide opening

[0070] 87 secondary guide opening

[0071] X Longitudinal direction

[0072] Y transverse direction

[0073] Z vertical direction

Claims

Patent claims:

1. Holding device (10) for holding a workpiece (1) to be machined, comprising a clamping unit for clamping the workpiece (1) to be machined and a fastening unit (8) for fastening the holding device (10) to a column (12), characterized in that the clamping unit has at least one guide pin (6, 7) which projects into at least one guide opening (86, 87) of the fastening unit (8), and that in a released state the at least one guide pin (6, 7) in a longitudinal direction (X) is movable relative to the guide opening (86, 87), and that in a locked state the at least one guide pin (6, 7) is fixed in the guide opening (86, 87).

2. Holding device (10) according to one of the preceding claims, characterized in that at least one fixing screw (9) is arranged on the fixing unit (8), by means of which the at least one guide pin (6, 7) can be fixed in the guide opening (86, 87), and in that the at least one fixing screw (9) can be screwed into the fixing unit (8) in a vertical direction (Z).

3. Holding device (10) according to one of the preceding claims, characterized in that the clamping unit has a primary guide pin (6) which is inserted into a primary guide opening (86) of the fastening unit (8) and a secondary guide pin (7) which projects into a secondary guide opening (87) of the fastening unit (8), and in that the guide pins (6, 7) are arranged offset from one another in a transverse direction (Y).

4. Holding device (10) according to one of the preceding claims, characterized in that the clamping unit has an intermediate element (5), to which the at least one guide pin (6, 7) is fastened, and a clamping element (2), and that the intermediate element (5) is arranged in the longitudinal direction (X) between the fastening unit (8) and the clamping element (2), and that the workpiece (1) to be machined can be clamped between the intermediate element (5) and the clamping element (2).

5. Holding device (10) according to claim 4, characterized in that the clamping unit has a clamping screw (4) by means of which the clamping element (2) can be clamped in the longitudinal direction (X) towards the intermediate element (5), and that the clamping screw (4) projects through the clamping element (2) and penetrates into the intermediate element (5).

6. Holding device (10) according to claim 5, characterized in that an elongated hole (24) is provided in the clamping element (2), which extends in the transverse direction (Y), and that the clamping screw (4) passes through the elongated hole (24).

7. Holding device (10) according to one of claims 4 to 6, characterized in that the clamping unit has a support element (3) which projects from the intermediate element (5) in the longitudinal direction (X) on a side facing away from the at least one guide pin (6, 7), and in that the clamped workpiece (1) rests on the support element (3) and on the clamping element (2).

8. Holding device (10) according to claim 7, characterized in that the support element (3) is movable relative to the intermediate element (5) in the longitudinal direction (X).

9. Holding device (10) according to one of claims 4 to 8, characterized in that the clamping unit has a support bolt (57) which projects from the intermediate element (5) in the longitudinal direction (X) on a side facing away from the at least one guide bolt (6, 7), and in that when the workpiece is clamped, the clamping element (2) rests against the support bolt (57).

10. Holding device (10) according to claim 9, characterized in that the support bolt (57) is movable relative to the clamping element (2) in the longitudinal direction (X).

11. Holding device (10) according to claim 7 and claim 9, characterized in that the clamping screw (4) is arranged in the transverse direction (Y) between the support element (3) and the support bolt (57).

12. Holding device (10) according to one of claims 9 to 11, characterized in that the support bolt (57) is designed in the form of a screw and is screwed into a bore in the secondary guide bolt (7), and that the support bolt (57) is movable by rotation relative to the intermediate element (5) in the longitudinal direction (X), and that 13. Holding device (10) according to one of claims 4 to 12, characterized in that a fastening screw (82) passes through the fastening unit (8), and that a through opening (52) is made in the intermediate element (5), and that the through opening (52) is aligned with the fastening screw (82) when the guide bolts (6, 7) of the clamping unit protrude into the guide openings (86, 87) of the fastening unit (8).

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