Drilling device with a dust extraction unit

Abstract

Drilling device (1) with a suction unit (2), the drilling device (1) comprising a drilling tool (3) which is guided radially and axially in a bushing (21) of the suction unit (2), the suction unit (2) comprising an adapter section (23) connectable to a drive unit (4) and a flange section (22), the bushing (21) being rotatably mounted in the flange section (22), the bushing (21) comprising at least one suction opening (211) on an end face through which an airflow can be directed via a suction channel (212) to a suction port (231) arranged on the adapter section (23), the flange section (22) comprising an air supply port (221), the air supply port (221) being connected to an air supply channel (222),and wherein the air supply channel (222) comprises a first outlet (223) in the region of the extraction opening (211) at the end face of the bushing (22) arranged in the flange section and / or wherein the air supply connection (221) is connected to an air supply channel (222), and wherein the air supply channel (222) comprises a second outlet (224) at the end section, which is opposite the end face with the extraction opening (211) of the bushing (22) arranged in the flange section.

Description

[0001] The invention relates to a drilling device with a suction unit according to the independent claim.

[0002] The invention lies in the technical field of tools for machining processes, in particular drilling devices for producing holes in plastic, such as carbon fiber reinforced plastic, and for removing chips produced during machining.

[0003] The production of boreholes in plastic, especially in carbon fiber reinforced plastic, represents an important task in new developments, particularly in road or air traffic or in mechanical and plant engineering, where resource-saving requirements are placed on design and construction.

[0004] For example, DE 10 2020 130 445 A1 shows a suitable cutting tool for machining plastic, which can be part of a drilling device.

[0005] The required drill diameters often range from 10 to 60 mm. Drilling such large holes in carbon fiber reinforced plastic results in unstable drilling conditions, and particular attention must be paid to preventing delamination and fiber protrusion at the hole exit. The problem arises that any material lifted during drilling, such as chips or fibers, can significantly impair the quality of the machining.

[0006] The invention aims to provide a drilling device that overcomes the disadvantages of the prior art and enables the production of larger holes of good quality while reducing the presence of fibers and chips.

[0007] The problem is solved by a drilling device with a suction unit having the features of the independent claim.

[0008] The invention comprises a drilling device with an extraction unit, the drilling device comprising a drilling tool that is guided radially and axially in a bushing of the extraction unit. The extraction unit comprises an adapter section connectable to a drive unit and a flange section. The bushing is rotatably mounted in the flange section. The bushing has at least one extraction opening on an end face, through which an airflow can be directed via an extraction duct to an extraction port arranged on the adapter section. Due to the extraction unit with the extraction opening arranged on the end face, through which an airflow is directed to the adapter section, the material removed during the production of large boreholes can be reliably guided away from the machining area.

[0009] According to a preferred technical aspect, the bushing comprises three extraction openings on one end face. The openings can be arranged elongated at the same radial distance (from a central axis).

[0010] A particularly advantageous feature is the double-walled design of the bushing, with the three extraction openings directing an airflow via an extraction duct located inside the wall to the opposite end section of the bushing. The wall can be designed in such a way that the airflow exits laterally.

[0011] Advantageously, the bushing includes guide rails. Three parallel rails, evenly distributed along the inner circumference of the bushing, can be arranged for this purpose, engaging with the side wall of the drilling tool.

[0012] Preferably, the bushing includes air guide elements on its end face. The air guide elements can be shaped like a scoop and distributed at equal intervals along the circumference to generate an airflow directed axially towards the drilling tool when the bushing moves together with the drilling tool.

[0013] The flange section preferably includes an air supply connection.

[0014] Advantageously, the air supply connection is linked to an air supply duct. The air supply duct has a first outlet in the area of ​​the extraction opening on the end face of the bushing located in the flange section.

[0015] The air supply connection is particularly advantageous when linked to an air supply duct. The air supply duct includes a second outlet at the end section, which is opposite the end face with the extraction opening of the bushing located in the flange section.

[0016] The air supply connection can be a radially arranged nozzle designed to guide an adjustable (variable) amount of air between the flange section and the bushing.

[0017] The invention will be further explained below with reference to the examples shown in the drawings.

[0018] They show: Fig. 1 a partially opened perspective view of a drilling device with a suction unit according to an embodiment of the invention; Fig. 2 a side sectional view of the drilling device made of Fig. 1; Fig. 3 a detailed representation of a bushing for the drilling device made of Fig. 1; Fig. 4 a side sectional view of the socket Fig. 1; Fig. 5 a detailed representation of a flange section for the drilling device made of Fig. 1; Fig. 6 a side sectional view of the flange section made of Fig. 1; and Fig. 7 a detailed representation of a flange section connected to the adapter section for the drilling device Fig. 1.

[0019] In Fig. Figure 1 shows a schematic representation of a drilling device 1 with a suction unit according to an embodiment of the invention.

[0020] The drilling device 1 has a drilling tool 3 which is guided radially and axially in a bushing 21 of the extraction unit 2. The bushing 21 guides the drilling tool 3 radially and axially by means of guide rails (see Fig. 4) and rotates together with it. For this purpose, the bushing 21 is held in the flange section 22 in two ball bearings, see Fig. 2.

[0021] The extraction unit 2 has an adapter section 23 that can be connected to a drive unit 4 and a flange section 22. The adapter section 23 has an extraction port 231 and openings 232 for drawing in ambient air. The openings 232 can be closed if necessary, or fitted with valves, for example, to adjust the strength of the external air supply.

[0022] The socket 21 has three elongated extraction openings 211 on its left end face, through which an extraction channel ( Fig. 2, reference number 212) an airflow can be directed to an extraction port 231 located on the adapter section 23. This allows material lifted during the drilling process to be reliably removed.

[0023] In Fig. Figure 2 is a sectional view of the drilling device 1. Fig. 1 shown.

[0024] The drilling device 1 has a drilling tool 3 which is guided radially and axially in the bushing 21 of the extraction unit 2. The bushing 21 rotates together with the drilling tool 3. For this purpose, the bushing 21 is held in the flange section 22 in two ball bearings 5.

[0025] The flange section 22 has an air supply connection 221 on its upper side, which is still related to Fig. 5 is explained.

[0026] As in Fig. As can be seen in Figure 3, the socket 21 is equipped with three extraction openings 211 on one end face.

[0027] The bushing 21 is double-walled to allow the extraction of fibrous material or dust through the cavity in the wall. Air guide elements 216 are installed in the front, outer area of ​​the bushing 21 to direct the annularly distributed supply air from the flange section forward. The forward-directed air acts as an "air curtain" or "barrier air" to keep the surrounding area free of drilling dust and to protect the bearings between the flange section 22 and the bushing 21.

[0028] Additionally, the drilling tool 3 can be equipped with tool cooling. The cooling medium can also be discharged via the bushing 21. This provides additional protection against drilling dust.

[0029] In Fig. Figure 4 shows the bushing 21 as a double-walled design in cross-section. The three extraction openings 211 are each connected to a separate extraction channel 212, which direct an airflow to the opposite end section 214 of the bushing 21.

[0030] Inside, the bushing 21 includes three guide rails 215 to guide or axially hold the drilling tool.

[0031] In Fig. Figure 5 shows a flange section 22 which includes an air supply connection 221. The air supply connection 221 is designed to be throttled.

[0032] In Fig. Figure 6 shows a sectional view of flange section 22.

[0033] The air supply port 221 is connected to an air supply duct 222. The flange section 22 has outlets at the front and rear ends. Additionally, the distribution of the airflow from front to rear can be controlled via a further throttle.

[0034] The air supply channel 222 includes a first outlet 223 in the area of ​​the extraction opening 211 on the end face of the bushing arranged in the flange section ( Fig. 1, Ref. 22).

[0035] The air supply channel 222 includes a second outlet 224 at the end section, which is connected to the end face with the extraction opening 211 of the bushing arranged in the flange section ( Fig. 1, Ref. 22) opposite.

[0036] In Fig. Figure 7 shows the extraction unit in its assembled state, with a representation of the two air flows.

[0037] The air supply connection 221 is connected to an air supply duct 222 with a first outlet 223. The air exiting there is discharged through the extraction opening 211.

[0038] This directs the extracted drilling dust into the adapter section 23 and extracts it via the extraction port 231 located there. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 102020130445 A1

[0004]

Claims

[1] Drilling device (1) with a suction unit (2), which drilling device (1) comprises a drilling tool (3) which is guided radially and axially in a bushing (21) of the suction unit (2), wherein the suction unit (2) comprises an adapter section (23) which can be connected to a drive unit (4) and a flange section (22), wherein the bushing (21) is rotatably mounted in the flange section (22), wherein the bushing (21) comprises at least one suction opening (211) on one end face, through which an air flow can be guided via a suction channel (212) to a suction connection (231) arranged on the adapter section (23). [2] Drilling device (1) according to claim 1, wherein the bushing (21) comprises three suction openings (211) on one end face. [3] Drilling device (1) according to claim 2, wherein the bushing (21) is double-walled and the three suction openings (211) guide an air flow to the opposite end section (214) of the bushing (21) via a suction channel (212) guided inside the wall. [4] Drilling device (1) according to one of the preceding claims, wherein the bushing (21) comprises guide rails (215). [5] Drilling device (1) according to one of the preceding claims, wherein the bushing (21) comprises air guiding elements (216) on the front side. [6] Drilling device (1) according to one of the preceding claims, wherein the flange portion (22) comprises an air supply connection (221). [7] Drilling device (1) according to claim 6, wherein the air supply connection (221) is connected to an air supply channel (222), and wherein the air supply channel (222) comprises a first outlet (223) in the region of the suction opening (211) on the end face of the bushing (22) arranged in the flange section. [8] Drilling device (1) according to claim 6, wherein the air supply connection (221) is connected to an air supply channel (222), and wherein the air supply channel (222) comprises a second outlet (224) at the end portion opposite the end face with the suction opening (211) of the bushing (22) arranged in the flange portion. [9] Drilling device (1) according to one of claims 6 to 8, wherein the air supply connection (221) is designed to provide a variable amount of air.

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