Cutting head lubrication mechanism

Abstract

The invention relates to a drill bit (1) comprising a cutting insert (2), characterized in that the drill bit (1) comprises at least one means for allowing displacement of liquid in its thickness, said means comprising at least two orifices (3) positioned on the surface of the drill bit (1) at the level of the insert (2).

Description

Technical Field

[0001] This invention relates to the field of boring head lubrication mechanisms, and more particularly to the field of boring head lubrication mechanisms including removable cutting inserts. Background Technology

[0002] Current standard practice is to lubricate or cool the boring head by spraying liquid onto its cutting surface.

[0003] Standard mechanical devices for achieving this lubrication or cooling include conduits inserted into the body of the boring head, with orifices opening near the cutting surface. The conduits within the boring head thus constitute a device for supplying liquid lubricant or coolant to be sprayed onto the cutting surface.

[0004] However, the position of the orifice of the supply line may be affected by the specific architecture of the portion of the boring head that holds the cutting surface, and the quality of the jet sprayed onto the cutting surface is affected by this.

[0005] Similarly, liquid lubricant or coolant is sprayed onto the cutting surface at specific points. However, when the cutting surface of the insert extends over a length greater than the point of impact of the liquid on the insert, cooling of the entire cutting surface is achieved through secondary spraying or liquid flow. The quality of cooling or lubrication is thus affected.

[0006] Similarly, when the insert is detachably mounted, i.e., when it can be moved or repositioned on the boring head, the cutting surface or cutting point is thus modified. Therefore, when the orifice of the lubricant or coolant supply line is fixed, the impact point of the liquid sprayed onto the insert is altered, so that the orifice no longer allows liquid to be sprayed onto the cutting surface at the point that would allow for optimal cooling or lubrication of the boring insert. Summary of the Invention

[0007] The object of the present invention is to overcome this disadvantage by providing a mechanism that allows for optimized lubrication or cooling of the cutting surface of the boring head, while maintaining optimal lubrication regardless of the position of the cutting surface as it moves on the boring head.

[0008] Therefore, the object of the present invention is a boring head including a cutting blade, characterized in that the body of the boring head includes at least one means for allowing liquid displacement, the means including at least two orifices on the surface of the boring head, the at least two orifices being located near the cutting blade. Attached Figure Description

[0009] The invention will be better understood from the following description, which relates to preferred embodiments, provided as non-exclusive examples and explained with reference to the accompanying drawings, in which:

[0010] - Figure 1 This is a schematic diagram of a first example of a boring head constructed according to the present invention;

[0011] - Figure 2 This is a schematic diagram of a second example of a boring head constructed according to the present invention. Detailed Implementation

[0012] Therefore, the object of the present invention is a boring head 1 including a cutting blade 2, characterized in that the body of the boring head 1 includes at least one means for allowing liquid displacement in its thickness, the means including at least two orifices 3 on the surface of the boring head near the blade 2.

[0013] In addition, the device includes at least three orifices 3.

[0014] The boring head of the present invention includes a plurality of orifices 3 on its surface near the cutting insert 2 constituting the cutting surface. Firstly, the boring head allows for a multiplication of the liquid injection angle, and secondly, it allows for a multiplication of the liquid injection points on the cutting surface. This multiplication of liquid injection on the cutting insert 2 results in optimal distribution of liquid coolant or lubricant on the cutting surface. Compared to liquid injection achieved from a single orifice 3, the multiplication of liquid injection impact points on the cutting insert 2 allows the liquid coolant to be distributed over a larger length or area.

[0015] According to a structural feature of the invention, the boring head 1 is characterized in that at least two orifices 3 are positioned at different heights on the edge of the cutting edge of the insert 2, thus allowing for optimal distribution of liquid coolant or lubricant along the cutting edge of the insert 2.

[0016] According to another supporting structural feature of the invention, the boring head 1 is characterized in that the device for liquid displacement includes at least one conduit, along which at least two orifices 3 are positioned. According to this structural feature, the orifices 3 are supplied through the same portion of a single conduit. It should be noted that although this structure is easy to implement, the pressure of the liquid exiting the orifices 3 decreases between the upstream orifice 3, which is the most upstream part of the liquid flow in the conduit, and the downstream orifice 3. However, when the at least two orifices 3 are sufficiently close together, this pressure change can be neglected in terms of the quality of the liquid jet onto the cutting blade 2.

[0017] According to another supporting structural feature, the boring head 1 according to the invention is characterized in that the device for liquid transfer includes a main pipeline, which is further divided into at least two auxiliary pipelines, each auxiliary pipeline including at least one corresponding orifice 3, such that these corresponding orifices 3 are connected to at least two orifices 3. According to this structural feature, the supply to each orifice 3 is made through a corresponding pipeline. It should be noted that although this configuration is more complex in practice than an architecture with a single pipeline, the several auxiliary pipelines branching from the main pipeline allow for liquid jets from the orifices 3 with substantially the same pressure across the different orifices 3. Therefore, the liquid jets from the orifices 3 are uniformly standardized throughout the entire cutting insert 2.

[0018] According to another supporting structural feature, the boring head 1 according to the invention is characterized in that, with the cutting insert 2 movably mounted on the boring head 1, the at least two orifices 3 are arranged along an axis substantially parallel to the displacement axis of the cutting insert 2. According to this structural feature, the injection of liquid lubricant or coolant is carried out along the alignment displacement path of the cutting insert 2. Therefore, regardless of the alignment position of the cutting insert 2, the liquid lubricant or coolant is optimally injected across the entire operating cutting surface.

[0019] According to another supporting structural feature, the boring head 1 according to the invention is characterized in that, for at least one orifice 3, the surface of the boring head 1 includes a slot 4 oriented from the orifice 3 toward at least one position of the cutting blade 2. According to this structural feature, the slot 4 creates a groove formed in the surface of the boring head 1. Preferably, the slot 4 is arranged along an axis 5 that substantially corresponds to a plane perpendicular to the orifice 3. The slot 4 allows for optimized guidance of the liquid flow injected from the orifice 3 onto the cutting blade 2.

[0020] According to one embodiment of this structural feature, the boring head 1 according to the invention is characterized in that, in the case where the boring head 1 includes at least two slots 4 oriented from at least two corresponding orifices 3, the at least two slots 4 are oriented along axes 5 that are substantially parallel to each other. Therefore, this embodiment allows for optimized orientation and guidance of liquid flows ejected at multiple points on an assembly having a length corresponding to at least a portion of the cutting blade 2.

[0021] According to alternative embodiments of this structural feature, or to some complementary embodiments of the foregoing embodiments, the boring head 1 according to the invention is characterized in that, in the case where the boring head 1 includes at least two slots 4 oriented from at least two corresponding orifices 3, the at least two slots 4 are oriented along an axis 5 that intersects near a location on the cutting insert 2. According to this embodiment, the slots 4 allow all or part of the liquid flow to be concentrated at a specific point on the cutting insert 2. This concentration of jets from different orifices 3 also allows liquid to be sprayed onto the cutting insert 2 from different angles, thus allowing for optimization of cooling and / or lubrication of the cutting insert 2 compared to jets from a single orifice.

[0022] According to another matching structural feature, the boring head 1 according to the invention is characterized in that the device for allowing liquid displacement is adapted to the flow of liquid lubricant.

[0023] According to another matching structural feature, the boring head 1 according to the invention is characterized in that the device for allowing liquid displacement is adapted to the flow of liquid coolant.

[0024] Obviously, the present invention is not limited to the embodiments described and depicted in the accompanying drawings. Modifications can still be made without departing from the scope of protection of the present invention, particularly modifications to the composition of various items or modifications by substitution with equivalent technologies.

Claims

1. A boring head (1), comprising a cutting blade (2), characterized in that, The body of the boring head (1) includes at least one device that allows liquid displacement on its thickness, the device including at least two orifices (3) on the surface of the boring head (1) near the cutting blade (2), and with the cutting blade (2) movably mounted on the boring head (1), the at least two orifices (3) are arranged along an axis generally parallel to the displacement axis of the cutting blade (2), and the at least two orifices (3) are positioned at different heights from the cutting edge of the cutting blade (2).

2. The boring head (1) according to claim 1, characterized in that, The device for liquid displacement includes at least one conduit, and the at least two orifices (3) are positioned along the at least one conduit.

3. The boring head (1) according to any one of claims 1 to 2, characterized in that, The device for liquid displacement includes a main pipeline, which is further divided into at least two auxiliary pipelines, each auxiliary pipeline including at least one corresponding orifice, such that the corresponding orifices (3) are in communication with at least two orifices (3).

4. The boring head (1) according to any one of claims 1 to 2, characterized in that, For at least one orifice, the surface of the boring head includes a slot oriented from the orifice toward at least one location of the cutting blade.

5. The boring head (1) according to claim 4, characterized in that, In the case where the boring head (1) includes at least two slots (4) oriented from at least two corresponding orifices (3), the at least two slots (4) are oriented along axes (5) that are generally parallel to each other.

6. The boring head (1) according to claim 4, characterized in that, In the case where the boring head (1) includes at least two slots (4) oriented from at least two corresponding orifices (3), the at least two slots (4) are oriented along an axis (5) that intersects near a location of the cutting blade (2).

7. The boring head (1) according to any one of claims 1 to 2, characterized in that, The device that allows liquid displacement is suitable for the flow of liquid lubricants.

8. The boring head (1) according to any one of claims 1 to 2, characterized in that, The device that allows liquid displacement is suitable for the flow of liquid coolant.

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