Vibration-damped tool holder with internal coolant supply

Abstract

Vibration-damped tool holder with internal coolant supply, including: - a main body (10) comprising a first receiving chamber (11), a second receiving chamber (12) and an adjustment threaded bore (13), wherein the first and second receiving chambers (11, 12) are arranged in the main body (10) and each extend to the two ends of the main body (10), wherein the adjustment threaded bore (13) is connected to the first and second receiving chambers (11, 12); - a water supply assembly (20) arranged in the second receiving chamber (12) and integrated into the main body (10), wherein the water supply assembly (20) has a water supply pipe (22) integrated into the main body (10) and has a water inlet channel (221) connected to the second receiving chamber (12); - a collet (30) which is arranged in the first receiving chamber (11) and has a tool receiving opening (31) connected to the first receiving chamber (11); - a sleeve (60) that is placed on the main body (10); - a pressure piece (40) arranged in the first receiving chamber (11) comprising a threaded section (41) screwed into the adjusting threaded bore (13), a pressure head (43) arranged at one end of the threaded section (41) and located in the first receiving chamber (11), a connecting channel (44) arranged inside the pressure piece (40) and connected to the water inlet channel (221), and a damping chamber (45) arranged inside the pressure piece (40) and extending from the pressure head (43) to the connecting channel (44); and - a damping assembly (50) comprising a damping spring (51) and a damping element (52) which are received in the damping chamber (45), wherein one end of the damping spring (51) is supported against the pressure piece (40), wherein the damping element (52) is made of a tungsten heavy metal alloy, is supported against the other end of the damping spring (51) and comprises a water supply passage (521), wherein the water supply passage (521) is connected to the connecting channel (44).

Description

[0001] The invention relates to a tool holder for machining, in particular a vibration-damped tool holder with internal coolant supply, in which vibrations generated during the machining of workpieces can be dampened.

[0002] When machining workpieces, strong counterforces often act on the tool holder, generating vibrations during the machining process. Generally, vibrations at tool holders are unavoidable when machining workpieces. For tool holders used to machine large workpieces, and therefore longer, the resulting vibrations not only reduce machining efficiency and lead to a rougher surface with noticeable machining marks, but also cause noise.

[0003] A conventional tool holder with internal coolant supply comprises a main body, a water supply assembly, and a tool support element. A tool for machining workpieces is mounted at one end of the main body. The water supply assembly is located inside the main body, near the other end. The tool support element is positioned inside the main body to support the tool.

[0004] The conventional tool holder with internal coolant supply of the type mentioned above is not equipped with any vibration damping structure, which means that vibrations at the tool holder, which occur when machining large or hard workpieces, impair the machining quality.

[0005] The invention is based on the objective of creating a vibration-damped tool holder with internal coolant supply, in which vibrations generated during the machining of workpieces are dampened, which contributes to an increase in machining quality and a reduction in noise.

[0006] The object of the invention is achieved by a vibration-damped tool holder with internal coolant supply, comprising the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

[0007] The vibration-damped tool holder with internal coolant supply according to the invention comprises the following: a main body comprising a first receiving chamber, a second receiving chamber and an adjustment threaded bore, wherein the first and second receiving chambers are arranged in the main body and each extend to the two ends of the main body, the adjustment threaded bore being connected to the first and second receiving chambers; a water supply assembly arranged in the second receiving chamber and integrated into the main body, wherein the water supply assembly has a water supply pipe integrated into the main body and has a water inlet channel connected to the second receiving chamber; a collet chuck which is arranged in the first receiving chamber and has a tool receiving opening connected to the first receiving chamber; a sleeve that is placed on the main body; a pressure piece arranged in the first receiving chamber and comprising a threaded section screwed into the adjustment threaded bore, a pressure head arranged at one end of the threaded section and located in the first receiving chamber, a connecting channel arranged inside the pressure piece and connected to the water inlet channel, and a damping chamber arranged inside the pressure piece and extending from the pressure head to the connecting channel; and a damping assembly comprising a damping spring and a damping element which are received in the damping chamber, wherein one end of the damping spring is supported against the pressure piece, wherein the damping element is made of a tungsten heavy metal alloy, is supported against the other end of the damping spring and comprises a water supply passage, wherein the water supply passage is connected to the connecting channel.

[0008] The vibration-damped tool holder with internal coolant supply according to the invention has the following advantages. According to the invention, the damping assembly is located inside the pressure piece. The damping element of the damping assembly is made of a high-density tungsten heavy metal alloy and has a higher specific gravity compared to the main body. The interaction of the damping element with the damping spring ensures that the vibrations generated during the machining of workpieces are dampened, which contributes to an increase in machining quality and a reduction in noise.

[0009] The invention is described in detail below with reference to an exemplary embodiment and the drawing. The drawing shows: Fig. 1 a perspective view of a preferred embodiment of a vibration-damped tool holder according to the invention with internal coolant supply, Fig. 2 a further perspective view of a preferred embodiment of a vibration-damped tool holder according to the invention with internal coolant supply, Fig. 3 a perspective view of a pressure piece and a damping assembly of the tool holder according to the invention in Fig. 1, Fig. 4 an exploded view of the pressure piece and the damping assembly in Fig. 3, Fig. 5 a sectional view of the tool holder according to the invention in Fig. 1, and Fig. 6 a schematic representation of the tool holder according to the invention in Fig. 1 in use in sectional view.

[0010] The following section explains the tasks, features, and advantages of the present invention in more detail with reference to the detailed description of the exemplary embodiment and the accompanying drawing. The invention is not intended to be limited to the features described in the description and shown in the drawing.

[0011] As in Fig. 1 and Fig. As shown in Figure 2, the vibration-damped tool holder according to the invention with internal coolant supply comprises a main body 10, a water supply assembly 20, a collet 30, a pressure piece 40, a damping assembly 50 and a sleeve 60.

[0012] As in Fig. 1, Fig. 2 and Fig. As shown in Figure 5, the main body 10 comprises two opposite ends, a first receiving chamber 11, a second receiving chamber 12, an adjustment threaded bore 13, and a connecting threaded bore 14. The first and second receiving chambers 11 and 12 are arranged inside the main body 10 such that they extend from the interior of the main body 10 to the two ends of the main body 10. The adjustment threaded bore 13 is arranged inside the main body 10 such that it is located in the central section of the main body 10 and is directly connected to the first receiving chamber 11. The connecting threaded bore 14 is arranged inside the main body 10 such that it is located in the central section of the main body 10 and is directly connected to the adjustment threaded bore 13 and the second receiving chamber 12.The adjusting threaded bore 13, which is directly connected to the first receiving chamber 11, is connected to the first and second receiving chambers 11, 12 by means of the connecting threaded bore 14.

[0013] As in Fig. 1, Fig. 2 and Fig. As shown in Figure 5, the water supply assembly 20 is arranged in the second receiving chamber 12 and integrated into the main body 10. The water supply assembly 20 comprises a connecting threaded bushing 21 and a water supply pipe 22, wherein the connecting threaded bushing 21 is provided with an external thread and is screwed into the connecting threaded bore 14 of the main body 10, wherein the water supply pipe 22 is inserted into the connecting threaded bushing 21 and comprises a water inlet channel 221 which is connected to the second receiving chamber 12.

[0014] As in Fig. 1, Fig. 2 and Fig. As shown in Figure 5, the collet 30 is mounted in the first receiving chamber 11 and includes a tool receiving opening 31 connected to the first receiving chamber 11. A tool 70 can be inserted into the tool receiving opening 31 of the collet 30, and it is conceivable to arrange a water outlet opening inside the tool 70. In the preferred embodiment, the tool 70 engages radially in the collet 30 via a locking element and is thus secured. Since the locking mechanism is known, it will not be described further here.

[0015] As in Fig. 3 to Fig. As shown in Figure 5, the pressure piece 40 is arranged inside the main body 10 and comprises a threaded section 41, an insertion section 42, a pressure head 43, a connecting channel 44, a damping chamber 45, and a fixing bore 46. The threaded section 41 is located in the central section of the pressure piece 40 and comprises two opposing ends and an external thread, the threaded section 41 being screwed into the adjusting threaded bore 13 of the main body 10. The insertion section 42 is arranged at one end of the threaded section 41, the outer diameter of the insertion section 42 being smaller than the outer diameter of the threaded section 41, the insertion section 42 being inserted into the water inlet channel 221 of the water supply pipe 22.The print head 43 is arranged at the other end of the threaded section 41 opposite the insertion section 42, wherein the outer diameter of the print head 43 is larger than the outer diameter of the threaded section 41, and the print head 43 can be supported on the tool 70.

[0016] As in Fig. 3 to Fig. As shown in Figure 5, the connecting channel 44, the damping chamber 45, and the fixing bore 46 are arranged inside the pressure piece 40. The connecting channel 44 extends from the threaded section 44 to both ends of the pressure piece 40. The damping chamber 45 extends from the pressure head 43 to the connecting channel 44 such that it is connected to the threaded section 44. The fixing bore 46 has a polygonal profile and extends from the insertion section 42 to the connecting channel 44 such that it is also connected to the connecting channel 44. In the preferred embodiment, the profile of the fixing bore 46 corresponds to the cross-section of an Allen key, so that the fixing bore 46 is also hexagonal in profile.

[0017] As in Fig. 3 to Fig. As shown in Figure 5, the damping assembly 50 is arranged in the damping chamber 45 of the pressure piece 40 and comprises a damping spring 51 and a damping element 52. The damping spring 51 is a compression spring, having two opposite ends, one end of which is supported against the pressure piece 40. The damping element 52 is a cylinder made of a tungsten heavy metal alloy, having two opposite ends and a water supply passage 521 extending to both ends of the damping element 52. The water supply passage 521 is connected to the connecting channel 44 via the damping chamber 45. The tool 70, inserted into the tool holder opening 31 of the collet 30, is connected to the water supply passage 521 via its water outlet opening.

[0018] As in Fig. 3 to Fig. As shown in Figure 5, in a preferred embodiment a groove 47 is arranged on the print head 43 of the pressure piece 40. According to the invention, a retaining ring 53 is installed in the groove 47, by means of which the damping spring 51 and the damping element 52 of the damping assembly 50 are confined in the damping chamber 45 of the pressure piece 40.

[0019] As in Fig. 1, Fig. 2 and Fig. As shown in Figure 5, the sleeve 60 is mounted on the main body 10 such that it encloses the collet 30 in the first receiving chamber 11. In the preferred embodiment, a bearing element is provided between the sleeve 60 and the main body 10, the bearing element being known and therefore not described in further detail here.

[0020] Further information will be provided on Fig. 1, Fig. 2 and Fig. 5. When the coolant is introduced via the water inlet channel 221 of the water supply pipe 22 of the water supply assembly 20, it can successively enter the water supply passage 521 of the damping piece 52 from the fixing bore 46 and the connecting channel 44 of the pressure piece 40. From the water supply passage 521, the coolant flows further into the water outlet opening of the tool 70. In this way, the coolant is sprayed out of the tool 70 to cool and lubricate the tool 70 and the workpiece.

[0021] As in Fig. 3 to Fig. As shown in Figure 5, a sealing groove 48 is arranged on the end part of the print head 43 of the pressure piece 40, in which a sealing ring 54 is fitted such that it surrounds the water supply passage 521 of the damping piece 52. This prevents the coolant from flowing out when entering the water supply passage 521 and then into the water outlet opening of the tool 70.

[0022] As in Fig. As shown in Figure 5, according to the invention, the damping element 52 of the damping assembly 50 is made of a high-density tungsten heavy metal alloy and has a higher specific gravity compared to the main body 10. The interaction of the damping element 52 with the damping spring 51 of the damping assembly 50 ensures that the vibrations generated during the machining of workpieces are dampened, which contributes to an increase in machining quality and a reduction in noise. In the preferred embodiment, the damping element 52 is a component made of a tungsten heavy metal alloy. However, it is also conceivable to manufacture the damping element 52 from another high-density material.

[0023] To adjust the tool 70 in the first receiving chamber 11 of the main body 10, the following applies: Fig.6. The user simply needs to insert an Allen key 80 into the second receiving chamber 12 of the main body 10, guide it through the water inlet channel 221 of the water supply pipe 22, and then insert it into the fixing bore 46 of the pressure piece 40. Since the Allen key 80, with its hexagonal cross-section, now engages in the corresponding hexagonally profiled fixing bore 46, the user can rotate the pressure piece 40 by turning the Allen key 80. This causes the pressure piece 40 to move along the adjusting threaded bore 13 of the main body 10 and push the tool 70 into the desired position.

[0024] Although the present invention has been described in detail with reference to one embodiment, it is obvious to those skilled in the art that the invention is not limited to this embodiment, but rather that modifications are possible such that individual features can be omitted or different combinations of features can be implemented without exceeding the scope of protection of the appended claims. The disclosure of the present invention includes all combinations of the individual features presented. Reference symbol list 10 main bodies 11 first admission chamber 12 second admission chamber 13 Adjustment threaded hole 14 Connecting threaded hole 20 Water supply assembly 21 Connecting threaded bushing 22 Water supply pipe 221 Water inlet channel 30 collet 31 Tool holder opening 40 printed pieces 41 Thread section 42 Insert section 43 Printhead 44 connection channel 45 damping chamber 46 fixing hole 47 Nut 48 Sealing groove 50 damping assembly 51 Damping spring 52 damping piece 521 Water supply passage 53 retaining ring 54 sealing ring 60 sleeve 70 tools 80 Allen keys

Claims

[1] Vibration-damped tool holder with internal coolant supply, comprising: - a main body (10) comprising a first receiving chamber (11), a second receiving chamber (12) and an adjustment threaded bore (13), wherein the first and second receiving chambers (11, 12) are arranged in the main body (10) and each extend to the two ends of the main body (10), wherein the adjustment threaded bore (13) is connected to the first and second receiving chambers (11, 12); - a water supply assembly (20) arranged in the second receiving chamber (12) and integrated into the main body (10), wherein the water supply assembly (20) has a water supply pipe (22) integrated into the main body (10) and has a water inlet channel (221) connected to the second receiving chamber (12); - a collet (30) which is arranged in the first receiving chamber (11) and has a tool receiving opening (31) connected to the first receiving chamber (11); - a sleeve (60) that is placed on the main body (10); - a pressure piece (40) arranged in the first receiving chamber (11) comprising a threaded section (41) screwed into the adjusting threaded bore (13), a pressure head (43) arranged at one end of the threaded section (41) and located in the first receiving chamber (11), a connecting channel (44) arranged inside the pressure piece (40) and connected to the water inlet channel (221), and a damping chamber (45) arranged inside the pressure piece (40) and extending from the pressure head (43) to the connecting channel (44); and - a damping assembly (50) comprising a damping spring (51) and a damping element (52) which are received in the damping chamber (45), wherein one end of the damping spring (51) is supported against the pressure piece (40), wherein the damping element (52) is made of a tungsten heavy metal alloy, is supported against the other end of the damping spring (51) and comprises a water supply passage (521), wherein the water supply passage (521) is connected to the connecting channel (44). [2] Tool holder according to claim 1, characterized by , that the pressure piece (40) comprises an insertion section (42) which is arranged at one end of the threaded section (41) opposite the print head (43), wherein the insertion section (42) is inserted into the water inlet channel (221) such that the connecting channel (44) is connected to the water inlet channel (221). [3] Tool holder according to claim 2, characterized by, that inside the pressure piece (40) a fixing bore (46) is arranged which has a polygonal profile and extends from the insertion section (42) to the connecting channel (44) in such a way that it is connected to the connecting channel (44). [4] Tool holder according to claim 3, characterized by , that a groove (47) is arranged on the print head (43) of the print piece (40) in which a retaining ring (53) is fitted, by means of which the damping spring (51) and the damping piece (52) of the damping assembly (50) are restricted in the damping chamber (45). [5] Tool holder according to claim 4, characterized by , that a sealing groove (48) is arranged on the end part of the print head (43), in which a sealing ring (54) is attached in such a way that it surrounds the water supply passage (521). [6] Tool holder according to one of claims 2 to 5, characterized by, that the printhead (43) has an outer diameter and the threaded section (41) has an outer diameter, wherein the outer diameter of the printhead (43) is larger than the outer diameter of the threaded section (41). [7] Tool holder according to claim 6, characterized by , that the insertion section (42) has an outer diameter, wherein the outer diameter of the insertion section (42) is smaller than the outer diameter of the threaded section (41). [8] Tool holder according to claim 7, characterized by, that the main body (10) has a connecting threaded bore (14) which is arranged inside the main body (10) such that it is located in the central section of the main body (10) and is directly connected to the adjusting threaded bore (13) and the second receiving chamber (11); that the water supply assembly (20) comprises a connecting threaded bushing (21) which is screwed into the connecting threaded bore (14), with the water supply pipe (22) being inserted into the connecting threaded bushing (21). [9] Tool holder according to claim 1, characterized by , that the main body (10) has a connecting threaded bore (14) which is arranged inside the main body (10) such that it is located in the middle section of the main body (10) and is directly connected to the adjusting threaded bore (13) and the second receiving chamber (11); that the water supply assembly (20) comprises a connecting threaded bushing (21) which is screwed into the connecting threaded bore (14), with the water supply pipe (22) being inserted into the connecting threaded bushing (21). [10] Tool holder according to claim 1, characterized by , that the printhead (43) has an outer diameter and the threaded section (41) has an outer diameter, wherein the outer diameter of the printhead (43) is larger than the outer diameter of the threaded section (41).

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