阅读说明：本技术 用于固定镗杆的装置 (Device for fixing boring bar ) 是由 胡贝特·基米希 于 2019-08-02 设计创作，主要内容包括：本发明涉及一种用于将镗杆(3)固定在切削机器上的固定装置(1),包括能被固定在机器卡盘中的柱形的变径套筒(2),在该变径套筒的前端部、即背离机器卡盘的端部上突出空心型材(5),该空心型材的同轴于变径套筒(2)轴线的、尤其是圆柱形的内部空间容纳镗杆(3),镗杆(3)从空心型材(5)中伸出的端部区域带有刀具(4),其中,稳定镗杆的空心型材(5)的位于空心型材内部空间(5a)和空心型材外壁之间的壁(5b)在刀具(4)从镗杆(3)突出的装置侧面区域中的厚度(D1)小于空心型材(5)的壁的其余部分的厚度(D2),其中,空心型材(5)的纵向轴线(L1)与变径套筒(2)和镗杆(3)的共同轴线(L2)轴向平行且隔开距离(A)。(The invention relates to a fastening device (1) for fastening a boring bar (3) to a cutting machine, comprising a cylindrical diameter-changing sleeve (2) that can be fastened in a machine chuck, a hollow profile (5) protruding at the front end of the diameter-changing sleeve, i.e. at the end facing away from the machine chuck, the particularly cylindrical interior of the hollow profile, which is coaxial to the axis of the diameter-changing sleeve (2), accommodating the boring bar (3), the end region of the boring bar (3) protruding from the hollow profile (5) having a tool (4), wherein the thickness (D1) of the wall (5b) of the hollow profile (5) stabilizing the boring bar, which wall is located between the hollow profile interior (5a) and the outer wall of the hollow profile, in the region of the device side of the tool (4) protruding from the boring bar (3), is smaller than the thickness (D2) of the remaining part of the wall of the hollow profile (5), wherein the longitudinal axis (L26) of the hollow profile (5) and the common axis (L1) of the diameter-changing sleeve (2) and the boring (L2) are axially parallel and spaced apart by a distance (A).)

1. A fixing device (1) for fixing a boring bar (3) on a cutting machine, comprising a cylindrical diameter-changing sleeve (2) which can be fixed in a machine chuck and at the front end of which, i.e. the end facing away from the machine chuck, projects a hollow profile (5) whose, in particular cylindrical, inner space (5a) coaxial to the axis (L2) of the diameter-changing sleeve (2) accommodates the boring bar (3), the end region of the boring bar (3) projecting out of the hollow profile being provided with a tool (4), characterized in that the thickness (D1) of the wall (5) of the hollow profile (5) of the stabilizing boring bar (3) between the inner space (5a) of the hollow profile and the outer wall of the hollow profile in the region of the device side face of the tool (4) projecting out of the boring bar (3) is smaller than the thickness (D2) of the remaining part of the wall (5b) of the hollow profile (5), wherein, the longitudinal axis (L1) of the hollow section bar (5) is axially parallel to the common axis (L2) of the reducing sleeve (2) and the boring bar (3) and is separated by a distance (A).

2. Device according to claim 1, characterized in that the outer wall (5c) of the stabilizing hollow profile (5) is cylindrical with a circular or elliptical cross section.

3. Device according to claim 1 or 2, characterized in that the outer wall (5c) of the stabilizing hollow profile (5) has a cross section with an optional flattened portion (5 d).

4. Device according to any one of the preceding claims, characterized in that the hollow-profile wall (5b) has, in the region of its minimum thickness (D1), a thickness which is 1/2 to 1/30 of the thickness of the hollow-profile wall in the region of its maximum thickness (D2).

5. Device according to any one of the preceding claims, characterized in that the stabilizing hollow profile (5) is integrally formed on the front end face of the reducing sleeve (2).

6. The device according to any one of claims 1 to 4, characterized in that the stabilizing hollow profile (5) is inserted and fixed, in particular longitudinally adjustable, in a longitudinal recess of the reducing sleeve (2).

7. Device according to any of the preceding claims, characterized in that the distance between the axis (L1) of the stabilizing hollow profile (5) and the axis (L2) of the reducing sleeve and the boring bar is 1/10 to 1/30, preferably 1/4 to 3/4 of the diameter of the boring bar (3).

8. Device according to any one of the preceding claims, characterized in that, on the side or area of the device from which the knife (4) protrudes, the thickness (D1) of the covering wall (5b) of the hollow profile is smaller than the thickness (D2) of the wall (5b) of the hollow profile on the remaining side/area.

9. A fixing device (1) for fixing a boring bar (3) on a cutting machine, comprising a reducing sleeve (2) fixed in a machine chuck, the boring bar (3) projecting in the axial direction of the axis (5) of the reducing sleeve (2) at the front end of the reducing sleeve, i.e. the end facing away from the machine chuck, the machine chuck and the boring bar (3) rotating about the same axis of rotation (5), and the end region of the boring bar (3) projecting to the outside carrying a tool (4), characterized in that the outer wall (3a) of the boring bar (3) is cylindrical with the boring bar axis of rotation (5) as the cylinder axis, but in addition to a flattening region (3b) of the outer wall (3a) of the boring bar, at the end of which the tool (4) projects from the boring bar and which is located between the reducing sleeve (2) and the tool (4), so that the radius (R2) of the outer wall (3a) of the boring bar in the flattening region (3b) is smaller than the outside of the cylindrical boring bar Radius of the rest of the wall (R1).

10. The device according to claim 9, characterized in that the radius (R2) of the boring bar in the paring area (3b) is 1/2 to 9/10 of the radius (R1) of the rest of the cylindrical boring bar outer wall (3 a).

11. Device according to claim 9 or 10, characterized in that the boring bar (3) is inserted eccentrically in a clamping or reducing sleeve which has the same axis of rotation as the boring bar.

12. The device according to any of the preceding claims, characterized in that the cross-sectional area of the boring bar (3) in the region (3c) remote from the tool is larger than in the region (3d) close to the tool, so that the cross-sectional area decreases from the clamping position towards the tool (4).

13. The device according to claim 12, characterized in that the reduction of the cross-sectional area of the boring bar (3) is performed stepwise.

Technical Field

The invention relates to a device for fastening a boring bar to a cutting machine, comprising a cylindrical diameter-changing sleeve that can be fastened in a machine chuck, wherein a hollow profile projects at the front end of the diameter-changing sleeve, i.e. at the end facing away from the machine chuck, wherein the inner space of the hollow profile, which is coaxial to the axis of the diameter-changing sleeve and is in particular cylindrical, accommodates the boring bar, and wherein the end region of the boring bar projecting out of the hollow profile is provided with a tool.

Background

Such a device is known from JP 3151632U. It has been shown that when turning a cylindrical cavity, the distance between the inner wall of the cavity and the outer wall of the hollow profile is too small to be able to turn a deep and narrow cavity without the hollow profile colliding with the cavity.

Disclosure of Invention

The object of the invention is to improve a device of the type mentioned at the outset in such a way that the boring bar, due to the improved higher rigidity, can also be drilled into narrow, deep holes and that better machining results and shorter machining times are achieved.

According to the invention, this object is achieved as follows: the wall of the hollow profile of the stabilizing boring bar, which is located between the inner space of the hollow profile and the outer wall of the hollow profile, has a smaller thickness in the device-side region of the tool protruding from the boring bar (i.e. the region on which the tool protrudes from the boring bar), than the remaining part of the wall of the hollow profile, wherein the longitudinal axis of the hollow profile is axially parallel to and spaced apart from the common axis of the reducing sleeve and the boring bar.

An increased play is present between the tool and the hollow profile of the stabilizing boring bar, so that the hollow profile can follow the tool into the bore without collision.

The following advantages are achieved by the device according to the invention:

By increasing the stability of the boring bar, greater feed, feed and cutting speeds can be achieved, with a corresponding reduction in the machining time.

Better surface quality can be achieved by reducing vibrations. The 'chatter marks' caused by vibration are greatly reduced.

The life of the tool is extended by reducing vibrations, thereby reducing the cost of the tool.

Even with simple and low-cost boring bars, significantly better, more inexpensive and inexpensive results can be achieved.

Smaller (thinner) and/or shorter, lower cost boring bars can also be inserted in the boring bar stabilizer to make larger and/or deeper holes. This reduces the number of tools and thus the cost.

The use of internally cooled boring bars is not necessary, since cooling can take place directly on the tool cutting edges by the boring bar side surfaces in combination with the boring bar stabilizers.

The gauge length of the boring bar can be variably adjusted, so that smaller diameters can be machined with the boring bar.

Larger and deeper diameters can now be turned without problems with smaller, thinner boring bars, which would normally lead to insufficient results and machining times if no boring bar stabilizer were present. This in turn means shorter set-up times, which further saves costs.

On the basis of its high stability, the tool can be used for rough machining and/or fine machining of internal and external machining. In a multi-axis machine tool, this saves tool changes (e.g., from an inner to an outer machining tool). Further time and cost savings can be achieved by eliminating the assistance time and reducing the cost of the tooling on the machine.

Preferably, it is provided that the outer wall of the stabilizing hollow profile is cylindrical with a circular or oval cross section. Furthermore, the outer wall of the stabilizing hollow profile may have a cross section with an optional flattened section.

If the hollow-profile wall has a thickness in the region of its minimum thickness of 1/2 to 1/30 of the thickness of the hollow-profile wall in the region of its maximum thickness, then there is sufficient clearance between the inner wall of the bore and the outside of the hollow profile.

The stabilizing hollow profile can be inserted and fixed (in particular longitudinally adjustable) into a longitudinal recess of the reducing sleeve. Preferably, the stable hollow section bar is integrally formed on the front end surface of the reducing sleeve.

The above-mentioned advantages are achieved in particular in that the distance between the axis of the stabilizing hollow profile and the axes of the reducing sleeve and the boring bar amounts to 1/10 to 1/30, preferably 1/4 to 3/4, of the diameter of the boring bar.

Preferably, it is provided that the thickness D1 of the covering wall of the hollow profile on the side or region of the device from which the tool projects is smaller than the thickness D2 of the wall of the hollow profile in the remaining side/region.

In an alternative embodiment, which lacks a hollow profile, it is proposed that the outer wall of the boring bar is cylindrical with the axis of rotation of the boring bar as the cylinder axis, but that, except for a flattened region of the outer wall of the boring bar, at the end of which region a tool projects from the boring bar and which flattened region is located between the reducing sleeve and the tool, so that in the flattened region the radius of the outer wall of the boring bar is smaller than the radius of the remaining part of the outer wall of the cylindrical boring bar. The radius of the boring bar in the region of the flattened area is preferably 1/2 to 9/10 of the radius of the remaining part of the outer wall of the cylindrical boring bar.

An important feature in this embodiment is that the boring bar is inserted eccentrically into a clamping sleeve or a reducing sleeve which has the same axis of rotation as the boring bar.

The stability of the boring bar is thereby significantly increased if the cross-sectional area of the boring bar in the region remote from the tool is greater than in the region close to the tool, so that the cross-sectional area decreases from the clamping position to the tool. The reduction in the cross-sectional area of the boring bar can take place in a stepped manner.

Drawings

Embodiments of the present invention are illustrated in the drawings and will be described below in detail. The attached drawings are as follows:

FIG. 1 shows a perspective view of a reducing sleeve, a hollow profile and a boring bar;

FIG. 2 shows an axial vertical section of a reducing sleeve with an integrally formed stabilizing hollow profile and an inserted boring bar;

FIG. 3 shows an axial horizontal cross-section of a reducing sleeve with an integrally formed stabilizing hollow profile and an inserted boring bar;

FIG. 4 shows an axial vertical section of a second embodiment without hollow profiles;

FIG. 5 shows an axial horizontal section of a second embodiment without hollow profile;

fig. 6 shows a perspective view of a third embodiment with a clamping sleeve;

fig. 7 shows a perspective view of a fourth embodiment with a clamping sleeve and a stepped boring bar.

Detailed Description

The device 1 according to the invention for fastening a boring bar 3 to a cutting machine (machine not shown) has a reducing sleeve (clamping sleeve) 2 which has a cylindrical outer circumferential surface 2a by means of which it can be fastened in a cylindrical recess of a machine chuck. The reducing sleeve has an optional flange 2b on the outer end. Furthermore, the reducing sleeve 2 has an inner longitudinal recess 2c into which the boring bar 3 is inserted in a form-fitting manner so as to be longitudinally adjustable, the outer circumferential surface 3a of the boring bar being cylindrical, so that the longitudinal recess 2c of the reducing sleeve 2 is also cylindrical with the same diameter D. The reducing sleeve (clamping sleeve) 2 and the boring bar 3 and the longitudinal recess 5a of the hollow profile 5 therefore have the same longitudinal axis L2.

In the exemplary embodiment according to fig. 1 to 3, the outer circumferential surface 3a of the boring bar 3 has an optional longitudinally oriented flattened section 3 b. A tool 4 is replaceably fixed to the tip end of the boring bar.

A hollow profile 5 is integrally formed as a boring bar stabilizer on the front end of the reducing sleeve 2, said hollow profile having a cylindrical longitudinal recess 5a into which the boring bar 3 is inserted in a form-fitting manner so as to be longitudinally adjustable, such that the longitudinal recess 5a is aligned with the longitudinal recess 2c of the reducing sleeve and has the same longitudinal axis L2.

The hollow profile 5 of the stabilizing boring bar 3 covers the boring bar 3 over its entire length, wherein the thickness D1 of the covering wall 5b of the hollow profile on the side or region of the device on which the tool 4 projects is smaller than the thickness D2 of the wall 5b of the hollow profile in the remaining side/region 5 c. The longitudinal axis L1 of the hollow profile 5 is thus parallel to and spaced apart from the longitudinal axis L2 of the cylindrical longitudinal recess 5a of the hollow profile 5 by the distance a.

As shown in fig. 2, a gap F is thereby produced between the cutting edge of the tool and the outer wall of the hollow profile 5. This allows the hollow profile to follow the tool cutting edge into the hole as a boring bar stabilizer without colliding with the workpiece.

In a not shown embodiment, the hollow profile 5 is not integrally formed on the reducing sleeve 2, but rather is positively located in a recess, in particular a bore, of the reducing sleeve, so that the inner contour of the recess/bore of the reducing sleeve 2 corresponds to the outer contour of the hollow profile 5.

The boring bar 3 is firmly clamped in the hollow profile 5 and in the reducing sleeve 2 by means of screws. In the embodiment in which the hollow profile is inserted into the reducing sleeve, the hollow profile is also clamped firmly in the reducing sleeve by means of screws. Clamping and/or fixing can also be carried out by other methods, for example by shrinking the boring bar.

Fig. 4 to 7 show embodiments in which the hollow profile 5 of the stabilizing boring bar 3 is missing. Instead, the boring bar, which is arranged coaxially in the reducing sleeve 2, is constructed sufficiently stable, as is shown in particular in fig. 6 and 7. The boring bar 3 can have a region 3c of particularly large cross section, which is remote from the tool. Close to the tool 4, the boring bar has a region 3d of smaller cross section, so that machining can also take place in smaller openings/holes. The transition from the larger cross section to the smaller cross section is preferably effected by one or more steps.

In the embodiment according to fig. 1 to 3, the hollow profile 5 serves as a boring bar stabilizer and has a flattened section, in the embodiment according to fig. 4 to 7 the hollow profile 5 is missing, and the boring bar 3 itself is flattened in its boring bar outer wall (flattened section 3b) and has the same advantages as mentioned above in connection with the flattened section of the hollow profile 5.

The outer wall 3a of the boring bar 3 is cylindrical with the boring bar axis of rotation 5 as the cylinder axis, but except for a flattened region 3b of the boring bar outer wall 3a, at the end of which the tool 4 projects from the boring bar and which is located between the reducing sleeve 2 and the tool 4, so that in the flattened region 3b the radius R2 of the boring bar outer wall 3a is smaller than the radius R1 of the rest of the cylindrical boring bar outer wall. The radius R2 of the boring bar in the flattened region 3b is 1/2 to 9/10 of the radius R1 of the rest of the cylindrical outer boring bar wall 3 a.

In the embodiment according to fig. 6 and 7, the hollow profile 5 as a stabilizer for the boring bar is also missing and the boring bar 3 again has a flattened section by means of a flattened region 3b of the outer wall of the boring bar.

The boring bar 3 is located eccentrically in a clamping sleeve 8 or a reducing sleeve which has the same axis of rotation as the boring bar. The cross-sectional area of the boring bar 3 decreases from its clamping position to the tool 4. The reduction in the cross-sectional area of the boring bar 3 preferably takes place in steps, see step 9.