NL2021958B1

NL2021958B1 - Milling blade assembly, a cutter tip of or for such a milling blade assembly, a milling machine and method of assembling such a milling blade assembly

Info

Publication number: NL2021958B1
Application number: NL2021958A
Authority: NL
Inventors: Diana Van Baardewijk Sylvia
Original assignee: Floor Iq B V; Diana Van Baardewijk Sylvia
Priority date: 2018-11-08
Filing date: 2018-11-08
Publication date: 2020-05-15

Abstract

The present invention relates to a milling blade assembly, comprising: - a disc-shaped base having a recess arranged at a circumference thereof; 5 - a cutter tip comprising a cutter part and an attachment part, wherein the cutter part is configured to extend radially outward from the circumference of the base; and - wherein the attachment part is a locking part and the recess is shaped to accommodate the locking part of the cutter tip in a form-locking manner. The invention further relates to a cutter tip of or for such a milling blade assembly 10 and to a milling machine comprising such a milling blade assembly. Furthermore, the invention relates to a method of assembling such a milling blade assembly, comprising the steps of: - arranging an attachment part of a cutter tip in a recess that is arranged at a circumference of a disc-shaped base, wherein a cutter part of said cutter tip radially extends 15 outward from said circumference of the base; - accommodating said attachment part, which is a locking part, in the recess in a from-locking manner.

Description

Milling blade assembly, a cutter tip of or for such a milling blade assembly, a milling machine and method of assembling such a milling blade assembly

The present invention relates to a milling blade assembly, and a cutter tip of or for such a milling blade assembly. The invention further relates to a milling machine comprising such a milling blade assembly, and to method of assembling such a milling blade assembly.

Milling blades are often made out of a single piece, but may also comprise an assembly of a base and a cutter tip that is attached to said base. An assembly of a base and a cutter tip allows the base and cutter tip to be made of different materials. The base may be made of a relatively cheap material, such as steel, whereas the cutter tip may be made from a more wear resistant and more expensive material, such as diamond.

Assembling prior art milling blade assemblies is very laborious and requires a high professional competence and utmost care of a craftsman. Until now, Applicant applied hand made milling blade assemblies, wherein a craftsman applied brazing to attach a cutter tip to a base. Utmost care is required for accurately positioning and attaching a cutter tip, and this has to be repeated for each independent cutter tip. The quality between milling blades varied, even when hard to find true craftsmen assembled the milling blade assemblies, simply because of the great amount of hand work.

An object of the present invention is to provide a milling blade assembly and a method of assembling such a milling blade assembly, that is improved relative to the prior art and wherein at least one of the above stated problems is obviated.

Said object is achieved with the milling blade assembly according to the present invention, comprising:

- a disc-shaped base having a recess arranged at a circumference thereof;

- a cutter tip comprising a cutter part and an attachment part, wherein the cutter part is configured to extend radially outward from the circumference of the base; and

- wherein the attachment part is a locking part and the recess is shaped to accommodate the locking part of the cutter tip in a form-locking manner.

Due to the recess being shaped to accommodate the locking part of the cutter tip in a form-locking manner, a reproducible positioning of the cutter tip relative to the disc-shaped base is obtained. The orientation of the recesses in the base determines the orientation of the cutter tip relative to the circumference of the base. The base may be provided with accurately machined recesses, possibly using computer numerical control (CNC) machines. The craftsman only has to insert the cutter tip inside the recess to obtain the pre-determined and desired orientation of said cutter tip. The difficulty of accurately positioning the cutter tip, and especially holding the cutter tip in the desired position during brazing thereof, is greatly simplified by use of the recesses and form-locking engagement between the cutter tips and said recesses. Consequently, assembling a milling blade assembly according to the present invention is less laborious and requires less professional competence of a craftsman, while also providing milling blade assemblies that have a higher and more consistent quality. The milling blade assemblies according to the invention are therefore more reliable.

Moreover, the form-locking engagement also results in safe milling blade assemblies, since the form-locking engagement may physically prevent a cutter tip from being released in a radial direction from the disc-shaped base during use thereof. The prior art milling blade assemblies, wherein the cutter tips are brazed to the base, may sometimes result in the cutter tip getting loose during use. In a worst case, the cutter tip may be propelled away in a radial direction relative to the base during milling. Milling machines are normally provided with protective covers to shield the milling blade and also offer protection against flying cutter tips. However, sometimes broken protective covers are not immediately replaced, thereby exposing a user to a risk of injury. The milling blade assembly according to the invention reduces the risk of cutter tips being propelled away from the base to a minimum.

The invention further relates to a cutter tip of or for such a milling blade assembly, and to a milling machine, comprising a drive and at least one such a milling blade assembly.

Furthermore, the invention relates to a method of assembling a milling blade assembly, comprising the steps of:

- arranging an attachment part of a cutter tip in a recess that is arranged at a circumference of a disc-shaped base, wherein a cutter part of said cutter tip radially extends outward from said circumference of the base;

- accommodating said attachment part, which is a locking part, in the recess in a from-locking manner.

Preferred embodiments are the subject of the dependent claims.

The various aspects and features described and shown in the specification can be applied, individually, wherever possible. These individual aspects, and in particular the aspects and features described in the attached dependent claims, may be made subject of divisional patent applications.

In the following description preferred embodiments of the present invention are further elucidated with reference to the drawing, in which:

Figure 1 is a perspective view of a milling machine having a milling blade assembly according to the invention;

Figure 2 is a perspective view of a milling blade assembly according to the invention;

Figure 3 is a radial view of the milling blade assembly of Figure 2; and

Figure 4 is an axial view of the milling blade assembly of Figure 1.

An example of a milling machine 17 that comprises a milling blade assembly 1 according to the invention is the floor heating milling machine shown in Figure 1. It comprises a drive 18 that is configured to drive the milling blade assembly 1 in the drive direction D.

The milling blade assembly 1 comprises a disc-shaped base 2 having a recess 3 arranged at a circumference 4 thereof. In said recess 3 is arranged a cutter tip 5 comprising a cutter part 6 and an attachment part 7, wherein the cutter part 6 is configured to extend radially outward from the circumference 4 of the base 2. The attachment part 7 is a locking part 8 and the recess 3 is shaped to accommodate the locking part 8 of the cutter tip 5 in a form-locking manner. The milling blade assembly 1 shown in Figures 2-4 comprises a total of ten recesses 3 and associated cutter tips

5.

As only the cutter part 6 of the cutter tip 5 extends radially outward relative to the circumference, the milling blade assembly 1 is not susceptible for clogging, e.g. by fermacell or gypsum fiber that has been removed by the milling blade assembly 1.

The locking part 8 is a hook part 10 that is configured to engage a hook engagement 11 of said base 2. In this way, the locking part 8, and more in particular the hook part 10, is accommodated in the recess 3 in a radially form-locking manner. When the base 2 spins at high speed during milling, centrifugal forces acting on the cutter tips 5 are directed radially outward relative to the base 2. The radial form-lock prevents that the cutter tip 5 may be propelled away in a radial direction relative to the base 2 during milling, which is potentially dangerous and may sometimes occur with prior art assemblies wherein the cutter tips are brazed to the base.

Although a hook part 10 may be obtained via a specific shape, such as a J-shape, the cutter tip 5 according to the preferred embodiment shown in the Figures comprises a tip narrowing 12 between the cutter part 7 and the locking part 8. The locking part 8 defines said hook part 10 as a result of the widening of said locking part 8 relative to the tip narrowing 12.

An abutment 13 extends radially inward from the circumference 4. The abutment provides a circumferential form-lock. When the cutter part 6 cuts into a layer of material, e.g. a layer of fermacell or gypsum fiber, that has to be removed by the milling blade assembly 1, the cutter tip 5 will be pressed against abutment 13. In the shown embodiment, the abutment 13 extends radially inward from the circumference 4 to a recess narrowing 14. Because the recess 3 is shaped to accommodate the locking part 8 of the cutter tip 5 in a form-locking manner, the tip narrowing 12 and the recess narrowing 14 are shaped correspondingly.

The cutter tip 5 is axially insertable into the recess 3, which allows it to be easily insertable while providing a guaranteed orientation of the cutter tip 5 relative to the base 2. Every cutter tip 5 will be accurately and reproducibly positioned relative to the disc-shaped base 2, that may have accurately machined recesses 3, e.g. machined using a CNC-machine, arranged therein.

The orientation of the recesses 3 in the base 2 determines the orientation of the cutter tip 5 relative to the circumference 5 of the base 2. Relative to hand made prior art milling blade assemblies, variability between several milling blade assemblies 1, and even variability in the orientation between successive cutter tips, is decreased. Thus, a more reliable milling blade assembly 1 having a more constant quality is provided by the invention.

As can be seen in Figures 2 and 3, the base 2 comprises recesses 3 and associated cutter tips 5, wherein circumferentially neighboring cutter tips 5 are arranged axially offset relative to each other.

A least one of the cutter tips 5 axially extends from an axial side 15 of the base 2. In the shown embodiment, at least two of the cutter tips 5 axially extend from opposite axial sides 15, 16 of the base 2. The axially extending cutter tips 5 remove material on the respective axial side 15, 16 of the base 2, in this way providing lateral space and contributing to the maneuverability of said milling blade assembly 1. The lateral space allows the milling blade assembly 1 to be gradually turned relative to a milling direction thereof, i.e. to the left side or to the right side in the radial view shown in Figure 3. In this way, with a milling machine 17 comprising a milling blade assembly 1 according to the invention, it is possible to remove material in bends

19.

The milling blade assembly 1 as described above is therefore particularly suitable for a floor heating milling machine, because the cutter tips 5 axially extending from the axial sides 15, 16 of the disc-shaped base 2 provides maneuverability to the milling blade assembly 1 during use. In this way, relative sharp bends 19 can be milled, allowing for a circuitry 20 of a floor heating system to be arranged in an existing floor 21 (Figure 1).

The milling blade assembly 1 preferably comprises an even number of recesses 3 and associated cutter tips 5, wherein circumferentially neighboring cutter tips 5 are alternately extending from opposite axial sides 15, 16 of the base 2. As mentioned before, the milling blade assembly 1 shown in Figure 2-4 comprises a total of ten recesses 3 and associated cutter tips 5.

The cutter part 6 of the cutter tip 5 has an axial width W that is larger than an axial thickness T of the base 2. The cutter tip 5, which is accommodated in the recess 3 in a formlocking manner, is securely attached. Thus, the thickness T of the base 2 may be dimensioned solely in correspondence with the forces it should be able to withstand, allowing for a limited thickness T. The thickness T may at least be smaller than for conventional milling blade assemblies where the cutter tips where attached to the base by brazing. After all, in these prior art milling blade assemblies, the cutter tips had to be brazed over a sufficiently large area to provide a relatively secure attachment, hence requiring a relatively wide base.

The cutter tip 5 is preferably axially attached to the base 2. The cutter tip 5 may at least be one of brazed, soldered, and welded to the base. Because the orientation of the cutter tip 5 is determined by the orientation of the respective recess 3 in the base 2, an axial attachment 24 only serves to prevent an axial displacement of the cutter tip 5 relative to the recess 3. The axial attachment 24 thus prevents that the cutter tip 5, which is axially insertable into the recess 3, can undesirably move out of the recess 3. The axial attachment 24 using brazing, welding or soldering is therefore not critical, and may therefore be performed much faster and without requiring highly skilled craftsmen.

The disc-shaped base 2 may be made of a first material and the cutter tip 5 may be made of a second sacrificial material. A worn out cutter tip 5 may be replaced by removing the optional but preferred axial attachment, axially sliding the worn out cutter tip 5 out of the recess 3. Once the recess 3 is clear, a fresh cutter tip 5 may be axially inserted into the recess 3, and preferably axially attached to the base 2.

The milling blade assembly 1 may be assembled by a method of assembling that comprising the steps of:

- arranging an attachment part 7 of a cutter tip 5 in a recess 3 that is arranged at a circumference 4 of a disc-shaped base 2, wherein a cutter part 6 of said cutter tip 5 radially extends outward from said circumference 4 of the base 2; and

- accommodating said attachment part 7, which is a locking part 8, in the recess 3 in a from-locking manner.

For assembling the shown milling blade assembly 1, the step of arranging the attachment part 7 of the cutter tip 5 in said recess 3 comprises the step of axially inserting said attachment part 7 into said recess 3.

The method preferably comprises the step of aligning a side 22, 23 of said cutter tip 5 with an axial side 15, 16 of the disc-shaped base 2. In this way, an accurate and reproducible axial positioning of the cutter tip 5 relative to the base 2 may be obtained. If the milling blade assembly 1 comprises a plurality of recesses 3 and associated cutter tips 2, cutter tips 5 that are aligned on the same axial side 15, 16 of the base 2 have a substantially same axial position relative to the base 2.

The step of aligning the side 22, 23 of said cutter tip 5 with the axial side 15, 16 of the disc-shaped base 2 may be applied to a cutter tip 5 having an axial width W that is larger than an axial thickness T of the base 2. Thus, if one side 22, 23 said cutter tip 6 is aligned with the axial side 15, 16 of the disc-shaped base 2, the cutter part 5 will axially extend from the opposite axial side 61, 15 of the disc-shaped base 2. By aligning the side 22, 23 of said cutter tip 5 with the axial side 15, 16 of the disc-shaped base 2 a very reproducible positioning of the cutter tip 5 relative to the disc-shaped base 2 is obtained. By providing cutter tips 5 with a desired width W, an accurate and reproducible axial extension of the cutter tip 5 relative to the base 2 is obtained.

The method preferably comprises the steps of:

- arranging cutter tips 5 in associated recesses 3 of said disc-shaped base 2; and

- arranging circumferentially neighboring cutter tips 5 axially offset relative to each other.

In order to arrive at the milling blade assembly shown in Figures 2-4, the method step of arranging circumferentially neighboring cutter tips 5 axially offset relative to each other comprises the step of aligning neighboring cutter tips 5 alternately with one axial side 15 of said base 2 and an opposite axial side 16 of said base 2. Thus, a first cutter tip 5 may be aligned with a first side 22 therefor to the one axial side 15 of the base 2, whereas a second cutter tip 5, which is neighboring the first cutter tip 5, may be aligned with a second side 23 therefor to the opposite axial side 16 of the base 2 (Figures 2 and 3).

In order to prevent that a cutter tip 5 may undesirably slide out of a recess 23, the method preferably further comprises the step of axially attaching said cutter tip 5 to the base 2. The axial attachment 24 may be brazed, welded or soldered.

The above described embodiment is intended only to illustrate the invention and not to limit in any way the scope of the invention. Accordingly, it should be understood that where features mentioned in the appended claims are followed by reference signs, such signs are included solely for the purpose of enhancing the intelligibility of the claims and are in no way limiting on the scope of the claims. The scope of the invention is defined solely by the following claims.

Claims

1. Cutter blade assembly, comprising:

a disc-shaped base with a recess arranged near a periphery thereof;

an intersection comprising a cutting part and a fastening part, the cutting part being arranged to extend radially outward from the periphery of the base; and

- the fixing part being a locking part and the recess being formed to accommodate the locking part of the cutting tip in a form-fitting manner.

A milling blade assembly according to claim 1, wherein the securing member is a hook member adapted to engage a hook engagement of said base.

The milling blade assembly according to claim 1 or 2, wherein the intersection between the cutting part and the securing part comprises a point narrowing.

The milling blade assembly according to at least one of the preceding claims, wherein a stop extends radially inward from the periphery.

Cutter blade assembly according to at least one of the preceding claims, wherein the cutting tip can be inserted axially into the recess.

A milling blade assembly according to at least one of the preceding claims, wherein the base comprises recesses and associated cutting points, wherein adjacent cutting points are axially offset relative to each other.

The milling blade assembly of claim 6, wherein at least one of the intersections extends axially from an axial side of the base.

A milling blade assembly according to claim 6 or 7, wherein at least two of the intersections extend axially from opposite axial sides of the base.

A milling blade assembly according to at least one of claims 6-8, comprising an even number of recesses and associated intersection points, and circumferentially adjacent intersection points alternately extending from opposite axial sides of the base.

A milling blade assembly according to at least one of the preceding claims, wherein the cutting portion of the cutting tip comprises an axial width greater than an axial thickness of the base.

Milling blade assembly according to at least one of the preceding claims, in which the locking part is accommodated in the recess in a circumferentially form-fitting manner.

The milling blade assembly according to at least claim 4 and claim 11, wherein the stop provides a circumferential positive fit.

Milling blade assembly according to at least one of the preceding claims, wherein the locking part is accommodated in the recess in a radially form-fitting manner.

The milling blade assembly according to at least claim 2 and claim 11, wherein the hook part comprises a radial molding.

The milling blade assembly according to at least one of the preceding claims, wherein the cutting tip is attached axially to the base.

The cutter blade assembly of claim 15, wherein the cutting tip is at least one of brazed, brazed, and welded to the base.

The milling blade assembly according to at least one of the preceding claims, wherein the disc-shaped base is made of a first material and the cutting tip is made of a second consumable material.

An intersection of or for a milling blade assembly according to any of claims 1-17.

Milling machine, comprising a drive and at least one milling blade assembly according to at least one of claims 1 to 17.

20. Method for assembling a milling blade assembly comprising the steps of:

- arranging an attachment part of an intersection point in a recess, which is arranged near a periphery of a disc-shaped base, wherein a cutting part of said intersection point extends radially outward from the circumference of the base;

accommodating said securing part, which is a securing part, in the recess in a form-fitting manner.

The method of claim 20, wherein the step of arranging the attachment part of the cutting tip in said recess comprises the step of axially inserting said attachment part into said recess.

The method of claim 20 or 21, comprising the step of aligning one side of said intersection with an axial side of the disk-shaped base.

The method of claim 22, wherein the step of aligning the side of said intersection with the axial side of the disc-shaped base is applied to an intersection with an axial width greater than an axial thickness of the base.

A method according to at least one of claims 20-23, comprising the steps of:

- arranging intersections in associated recesses of said disc-shaped base; and

- axially offset intersecting intersecting points.

The method of claim 24, wherein the step of staggering circumferentially adjacent intersection points comprises the step of alternately aligning adjacent intersection points with one axial side of said base and an opposite axial side of said base.

The method of at least one of claims 20-25, further comprising the step of axially attaching said intersection to the base.

A method according to at least one of claims 20-26, wherein the method is used for assembling a milling blade according to at least one of claims 1-

17.