CN213674510U - Three-blade woodworking through hole gang drill - Google Patents

Abstract

The application relates to the field of woodworking instruments, in particular to a three-blade woodworking through hole gang drill. The three-blade woodworking through-hole gang drill is provided with a drill tip, a spiral cutting part and a tool shank which are connected in sequence. The drill point is provided with three groups of edge blades which are rotationally symmetrical about the center of a central axis; the edge is provided with a first cutting edge and a second cutting edge. The spiral cutting part is provided with three groups of spiral cutting edges and spiral row cutting grooves which are rotationally symmetrical about the center of a central axis. The gang drill is supported by three different directions during operation, effectively restrains radial vibration of the gang drill, improves the cylindricity and the surface finish of a processing hole and the service life of the gang drill, has smaller cutting edge consumption of each group of spiral cutting edges or side edges, produces smaller scrap iron which is easy to discharge, and further prolongs the service life of the gang drill. The bottom of the cutter handle is provided with a threaded blind hole, a matched adjusting screw is arranged during machining, the height of each drill point can be adjusted by adjusting the screwing-in depth of the adjusting screw, and the problem that the precision of a machined hole is influenced by different drill point heights is solved.

Description

Three-blade woodworking through hole gang drill

Technical Field

The application relates to the field of woodworking instruments, in particular to a three-blade woodworking through hole gang drill.

Background

The carpenter gang drill is carpenter gang drill bit, generally uses with numerical control gang drill machine is in coordination, can carry out drilling treatment to a plurality of positions of machined part simultaneously, and carpenter gang drill machining efficiency is high, can process the machined part of a greater amount in the short time, consequently, in carpenter's processing field, carpenter gang drill is often used for among the mass production of timber finished piece. Among the prior art, conventional carpenter's gang drill generally adopts the twolip design, and the twolip design wholly provides the support of two not equidirectionals for the gang drill, and this carpenter's gang drill is relatively poor in stability when actual drilling processing, produces radial irregular vibration easily. Radial movement of the woodworking gang drill needs to be avoided as much as possible in the machining process, and the radial movement easily causes the change of the inner diameter of a machined hole, so that the cylindricity and the surface finish of the machined hole are poor, and the precision of the machined hole is influenced; moreover, the radial irregular motion of the woodworking gang drill during processing can cause great damage to the woodworking gang drill, accelerate the loss speed of the woodworking gang drill and seriously reduce the service life of the woodworking gang drill. In addition, a plurality of gang drills are adding man-hour, generally require a plurality of drill bits to punch to the work piece surface simultaneously in order to avoid the vibration of punching to make follow-up drill bit skew predetermine the station, and current carpenter gang drill is difficult to satisfy this demand.

SUMMERY OF THE UTILITY MODEL

The application provides a three-blade woodworking through-hole gang drill, including handle of a knife, spiral cutting portion, drill point, spiral cutting portion both ends are located to drill point and handle of a knife. The spiral cutting part comprises three groups of spiral cutting edges and spiral row cutting grooves. Each set of helical cutting edges and helical rows of cutting flutes are rotationally symmetric about the center axis. The drill point is provided with three groups of edge blades, and each group of edge blades is rotationally symmetrical about the center axis. Each group of edge blades is provided with a first cutting blade and a second cutting blade in turn along the reverse direction of the feeding direction. The first cutting edges are arranged at the intersection line of the second rear cutter faces of two adjacent groups of second cutting edges. The bottom of the handle is provided with a threaded blind hole, and the threaded blind hole is provided with an adjusting screw during working.

Optionally, an included angle between the first cutting edge and the central axis is α, an included angle between the second cutting edge and the central axis is β, where α is greater than or equal to 40 degrees and less than or equal to 50 degrees, and β is greater than or equal to 20 degrees and less than or equal to 35 degrees.

Optionally, the edge is provided with a third cutting edge, and the first cutting edge, the second cutting edge and the third cutting edge are sequentially arranged along the reverse direction of the feeding direction; the included angle between the third cutting edge and the central axis is gamma, wherein the gamma is more than or equal to 5 degrees and less than or equal to 20 degrees. The third cutting edge is arranged to avoid the situation that the connecting position of the second cutting edge is too sharp due to the direct connection of the second cutting edge and the spiral cutting edge, so that the drill bit is easy to damage.

Optionally, an included angle between the second flank of the second cutting edge and the third flank of the third cutting edge is δ, wherein δ is greater than or equal to 15 ° and less than or equal to 35 °.

Optionally, two adjacent groups of spiral cutting edges and spiral row cutting grooves are in central rotational symmetry of 120 degrees with respect to the central axis; two adjacent groups of edge blades are in 120-degree central rotational symmetry about the central axis. The symmetrical arrangement means that the drill point and the spiral cutting part are uniformly arranged, the structure is more stable, the drill bit can keep radial stability in the drilling process, the cylindricity and the surface smoothness of a machined hole are improved, and the service life of the drill bit is prolonged.

Optionally, the three groups of first cutting edges intersect at a point in the feeding direction to form a central point; the center point is located on the center axis, and the height of the center point in the feeding direction is higher than the first cutting edge and the second cutting edge.

Optionally, a clamping plane is arranged on the side surface of the cutter handle, and the clamping plane is parallel to the feeding direction; the other parts of the side surface of the knife handle are cylindrical surfaces.

Optionally, the side surface of the knife handle is connected with the bottom surface of the knife handle by a chamfer; the spiral cutting part is connected with the cutter handle by adopting a conical connecting surface. The above features may be combined in any combination to match different fixtures, and one of ordinary skill in the art can easily implement this approach in combination with common general knowledge in the art.

Optionally, in order to further improve the wear resistance, the spiral cutting part or the spiral cutting edge is made of wear-resistant hard alloy.

Optionally, the drill tip and the helical cutting portion are welded by a conical surface, and the conical angle of the conical surface is 120 °. The connection relation between the drill point and the spiral cutting part is relatively tight.

The three-edge woodworking through hole gang drill is provided with a drill tip, a spiral cutting part and a tool shank, wherein the two ends of the drill tip and the spiral cutting part are respectively connected with the drill tip and the tool shank. In particular, the drill tip is provided with three groups of edge blades which are rotationally symmetrical about the center axis; the spiral cutting part is also provided with three groups of spiral cutting edges and spiral row cutting grooves which are rotationally symmetrical about the center of the central axis. The edge is provided with a first cutting edge and a second cutting edge along the direction opposite to the feeding direction. The bottom of handle of a knife is equipped with the screw thread blind hole, the screw thread blind hole is equipped with the internal thread, and under operating condition, the screw thread blind hole matches there is adjusting screw, can adjust the height of every drill point through adjusting screw's precession degree of depth. Through the setting, three sword carpenter's through-hole gang drill possess following beneficial effect at least:

1) during machining, compared with the two-way support of the double-edge gang drill, the three groups of edge edges and spiral cutting edges which are rotationally symmetrical about the center of the central axis integrally form three-way supports for the drill bit, the three-way support mode is firmer, the radial vibration of the gang drill can be effectively inhibited, and the cylindricity and the surface smoothness of a machined hole are improved;

2) the threaded blind holes are matched with the adjusting screws, so that the heights of the drill points of a plurality of gang drills can be quickly and conveniently set before machining, and the problem that the machining hole precision is influenced due to the fact that the heights of the drill points are inconsistent is solved;

3) the setting up of three group's limit sword and spiral cutting edge makes the cutting load of every group limit sword and spiral cutting edge reduce, has both reduced the degree of wear, and in addition, the iron fillings that the single sword produced are less, are favorable to the discharge and the heat dissipation of iron fillings to promote the holistic life of gang drill.

Drawings

FIG. 1 is a schematic perspective view of the three-blade woodworking through-hole gang drill;

FIG. 2 is a schematic structural view of the three-blade woodworking through-hole gang drill in front view;

FIG. 3 is a left side view structural schematic diagram of the three-blade woodworking through-hole gang drill;

FIG. 4 is a schematic view of the bottom view of the three-blade woodworking through-hole gang drill;

FIG. 5 is a schematic top view of the three-blade woodworking through-hole gang drill;

FIG. 6 is a schematic view of the cross-sectional structure A-A of FIG. 2;

FIG. 7 is a schematic view of a cross-sectional structure B-B in FIG. 2;

FIG. 8 is an enlarged view at C in FIG. 2;

fig. 9 is a schematic view of a cross-sectional structure D-D in fig. 3.

The reference numbers in the figures illustrate:

1-tool shank, 11-clamping plane, 12-chamfer, 13-threaded blind hole, 14-adjusting screw, 15-tapered connecting surface, 2-spiral cutting part, 21-spiral cutting edge, 22-spiral row cutting groove, 3-drill tip, 31-first cutting edge, 32-second cutting edge, 33-third cutting edge, 34-second flank face and 35-third flank face.

Detailed Description

The present invention will be described with reference to the accompanying drawings and embodiments.

As shown in fig. 1 to 6, the three-edge woodworking through-hole gang drill comprises a tool shank 1, a spiral cutting part 2 and a drill tip 3. The tool shank 1 is used for connecting a clamp, the spiral cutting part 2 mainly further processes the side face of a machined hole and plays a chip removal role, and the drill tip 3 is a machining part in the feeding direction. The drill tip 3 and the tool shank 1 are arranged at two ends of the spiral cutting part 2. In particular, the spiral cutting part of the three-edge woodworking through hole gang drill comprises three groups of spiral cutting edges 21 and spiral gang cutting grooves 22. Each set of helical cutting edges 21 and helical rows of cutting flutes 22 is rotationally symmetric about the centre axis. It should be noted that the central axis refers to an axial central axis of the helical cutting portion 2, and unless otherwise specified, the central axis is an axial central axis in the present application. The arrangement is intended to make the shape and size of each set of the helical cutting edges 21 and the helical row cutting grooves 22 the same, and to make the machining surfaces of the helical cutting edges 21 on the same cylindrical surface, and is in consideration of the uniformity of the bore diameter of the machined hole and the smoothness of the hole surface. In addition, importantly, through the arrangement, when the drilling and machining are carried out, the three groups of spiral cutting edges 21 can integrally form three supports in different directions for the spiral cutting part 2 or the gang drill, compared with a traditional double-edge drill, the three-side support is more stable, the radial vibration during the gang drill machining is effectively inhibited, and the cylindricity and the surface finish of a machined hole are further improved. Moreover, under the same processing working condition, the cutting amount of each group of spiral cutting edges 21 is obviously reduced, namely the cutting force is reduced, the service life of a single spiral cutting edge 21 can be obviously prolonged, namely the service life of the integral spiral cutting part 2 is prolonged. In addition, importantly, the cutting amount of each group of spiral cutting edges 21 is reduced, so that the scrap iron generated by each group of spiral cutting edges 21 is correspondingly reduced, the smaller scrap iron is easier to discharge, the heat dissipation of the gang drill is facilitated, and the performance and the service life of the gang drill are further improved. The drill tip 3 is provided with three sets of side edges, and likewise, each set of side edges is rotationally symmetrical about the center axis, and the principle and function of the drill tip are the same as or similar to those of the spiral cutting edge 21 and the spiral row of cutting grooves 22, which will not be described herein again. The side edges are provided with a first cutting edge 31 and a second cutting edge 32 in sequence in the reverse direction of the feeding direction, and as shown in a plan view, the first cutting edge 31 is arranged at the intersection of the second flank surfaces 34 of two adjacent groups of the second cutting edges 32, or the flank surfaces of the first cutting edge 31 and the second flank surfaces 34 of the second cutting edges 32 are the same curved surface.

A more preferred way is: on the basis, two adjacent groups of spiral cutting edges 21 and spiral row cutting grooves 22 are in 120-degree central rotational symmetry about the central axis, and two adjacent groups of side edges are in 120-degree central rotational symmetry about the central axis; that is, each set of the helical cutting edges 21 and the helical row grooves 22 is uniformly distributed in the helical cutting portion 2 and each set of the side edges is uniformly distributed in the drill tip 3. Under this setting, every spiral cutting edge 21 of group is more firm to spiral cutting portion 2 and the support of limit sword to drill point 3, and the volume of cutting, the atress etc. of eating of every spiral cutting edge 21 of group, limit sword are comparatively even, are favorable to the gang drill stability of adding man-hour to, the shortest life of three spiral cutting edges 21 of group, limit sword can promote, and the whole life of gang drill can promote promptly. In addition, in order to enhance wear resistance, it is preferable to use a wear-resistant cemented carbide for the helical cutting portion 2 or the helical cutting edge 21.

As shown in fig. 7, the bottom of the tool shank 1 of the three-blade woodworking through-hole gang drill is provided with a threaded blind hole 13, the threaded blind hole 13 is provided with internal threads, when the three-blade woodworking through-hole gang drill works, namely, when drilling and machining are carried out, an adjusting screw 14 is arranged inside the threaded blind hole 13, and the screwing depth of the adjusting screw 14 into the threaded blind hole 13 is adjustable. The threaded blind hole 13 and the adjusting screw 14 matched with the threaded blind hole are used for: the height of the drill points 3 of each row of drill is adjusted by adjusting the screwing depth of the adjusting screw 14, so that the heights of the drill points 3 are kept consistent, the advantage of the arrangement is that when a plurality of machining holes are machined simultaneously, through the operation, the heights of the drill points 3 are kept consistent, the machining can be started simultaneously, the phenomenon that the drill bit machined at first deviates from a preset station due to the fact that the machining sequence exists, and the machining precision is influenced because the drill bit machined at first vibrates. Through the arrangement, the condition can be avoided, and the adjusting method is quick and simple and has good practicability.

As shown in fig. 5 and 8, a preferred arrangement of the drill tip 3 is: the included angle between the first cutting edge 31 and the central axis is alpha, the included angle between the second cutting edge 32 and the central axis is beta, wherein beta is more than or equal to 20 degrees and less than or equal to 35 degrees, and alpha is more than or equal to 40 degrees and less than or equal to 50 degrees; under this setting, 3 feed volumes of drill point are comparatively suitable, and cutting strength is higher to easily discharge iron fillings, whole wearing and tearing are less, consequently possess higher machining efficiency and longer life.

As shown in fig. 8 and 9, the drill tip 3 is preferably further provided with a third cutting edge 33, and the third cutting edge 33 is provided at one end of the second cutting edge 32 opposite to the feeding direction, that is, the first cutting edge 31, the second cutting edge 32, and the third cutting edge 33 are provided in this order in the direction opposite to the feeding direction. The included angles of the first cutting edge 31, the second cutting edge 32 and the third cutting edge 33 and the central axis are reduced in sequence. Specifically, the included angles between the first cutting edge 31 and the second cutting edge 32 and the central axis are as described above, and the included angle between the third cutting edge 33 and the central axis is γ, where γ is greater than or equal to 5 ° and less than or equal to 20 °. The third cutting edge 33 is provided for: the transition is formed between the second cutting edge 32 and the spiral cutting part 2, the intersection of the second cutting edge 32 and the spiral cutting edge 21 is prevented from being too sharp, if the intersection of the second cutting edge 32 and the spiral cutting edge 21 is too sharp, the intersection is easy to generate stress concentration to cause structural damage and failure, so that the service life of the drill is reduced, and the problem can be well solved by adopting the arrangement of the third cutting edge 33, so that the arrangement of the third cutting edge 33 is taken as a preferred embodiment of the drill tip 3. On the basis of the arrangement provided with the third cutting edge 33, the included angle between the second flank 34 of the second cutting edge 32 and the third flank 35 of the third cutting edge 33 is δ, wherein δ is not less than 15 ° and not more than 35 °.

As shown in fig. 1 and 5, the positioning manner of the three-blade woodworking through-hole gang drill is as follows: the three sets of first cutting edges 31 intersect in the feed direction at a point which constitutes a central point which lies on the central axis and which, in the feed direction, has a higher height than the first and second cutting edges 31, 32, and in the case of the provision of the third cutting edge 33, the height of the central point is obviously also higher than the third cutting edge 33, since the third cutting edge 33 is provided on the opposite side of the second cutting edge 32 in the feed direction. The height refers to the height of each structure when the drill bit is vertically placed and the drill tip 3 faces upwards, and another way is to say that: during the drilling process of the drill, the center point is the structure which firstly touches the workpiece. It should be noted that, strictly speaking, the center point is formed by the intersection of the first cutting edges 31, and therefore, the center point should belong to a partial structure of the first cutting edges 31, but when comparing the heights of the structures, it is obvious that the center point having a higher height than the first cutting edges 31 means that the center point has a higher height than the first cutting edges 31 except the center point, and since the center point is only a conceptual structure, the term is logical, and a person skilled in the art should understand that the term is logical.

As shown in fig. 1, 2, and 5, in order to facilitate the clamping of the clamp, the tool holder 1 is provided with a clamping plane 11 on a side surface thereof, the clamping plane 11 is parallel to the feeding direction, and other portions of the side surface of the tool holder 1 are cylindrical surfaces. In order to clamp the tool shank 1 on the clamp, the side surface and the bottom surface of the tool shank 1 can be connected through a chamfer 12 or the spiral cutting part 2 and the tool shank 1 are connected through a conical connecting surface 15. The technical features can be combined arbitrarily, and the combination mode is easy to be combined with the actual situation for a person skilled in the art; in addition, the specific shape of the tool shank 1 can be set correspondingly according to different clamps; the above means can be easily obtained and implemented by a person of ordinary skill in the art by combining the prior art and common general knowledge, and thus the above means can constitute a clear and complete technical scheme.

As shown in fig. 7, the spiral cutting part 2 is connected with the drill tip 3 by welding, in order to improve the connection firmness of the spiral cutting part 2 and the drill tip 3, as a preferred embodiment, the bottom of the drill tip 3 is a conical surface, the top of the spiral cutting part 2 is provided with a conical groove matched with the bottom of the drill tip 3, the drill tip 3 is welded with the spiral cutting part 2 by the conical surface, and the conical angle is 120 °. Under this setting, the connection face of drill point 3 and spiral cutting portion 2 is great, and spiral cutting portion 2 and drill point 3's connection is very firm.

It should be noted that, in the present application, unless otherwise stated, the terms bottom, top, height, etc. are based on the upward state of the drill tip 3 after the three-blade carpentry through-hole gang drill is normally assembled, and the bottom is the position facing downward under the reference system. In the present application, the feed direction is the axial direction of movement of the drill when drilling is performed, and the main direction of movement is the direction of a rotational tangent to a point on the gang drill edge or the helical cutting edge 21. The above description is common general knowledge in the art and should be understood by those skilled in the art.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims (10)

1. A three-edge woodworking through hole gang drill comprises a cutter handle (1), a spiral cutting part (2) and a drill tip (3), wherein the drill tip (3) and the cutter handle (1) are arranged at two ends of the spiral cutting part (2), and the three-edge woodworking through hole gang drill is characterized in that the spiral cutting part (2) comprises three groups of spiral cutting edges (21) and spiral gang cutting grooves (22), and each group of spiral cutting edges (21) and spiral gang cutting grooves (22) are rotationally symmetrical about the center of a central axis; the drill point (3) is provided with three groups of side edges, and each group of side edges is rotationally symmetrical about the center of the central axis; each group of edge blades are sequentially provided with a first cutting blade (31) and a second cutting blade (32) along the reverse direction of the feeding direction, and the first cutting blade (31) is arranged at the intersection line of second rear cutter faces (34) of two adjacent groups of second cutting blades (32); the tool handle is characterized in that a threaded blind hole (13) is formed in the bottom of the tool handle (1), and an adjusting screw (14) is arranged at the threaded blind hole (13) during working.

2. A three-edged woodworking through-hole gang drill as claimed in claim 1, wherein the first cutting edge (31) forms an angle α with the central axis, and the second cutting edge (32) forms an angle β with the central axis, wherein α is greater than or equal to 40 ° and less than or equal to 50 °, and β is greater than or equal to 20 ° and less than or equal to 35 °.

3. A three-edged woodworking through-hole gang drill as claimed in claim 1, wherein the edge is provided with a third cutting edge (33), the first (31), second (32) and third (33) cutting edges being arranged in succession in the direction opposite to the feed direction; the included angle between the third cutting edge (33) and the central axis is gamma, wherein the gamma is more than or equal to 5 degrees and less than or equal to 20 degrees.

4. A three-edged woodworking through-hole gang drill as claimed in claim 3, characterized in that the angle between the second flank surface (34) of the second cutting edge (32) and the third flank surface (35) of the third cutting edge (33) is δ, wherein δ is greater than or equal to 15 ° and less than or equal to 35 °.

5. A three-edged woodworking through-hole gang drill as claimed in claim 1, wherein two adjacent sets of helical cutting edges (21) and helical gang cutting flutes (22) are rotationally symmetric about a central axis at 120 ° centers; two adjacent groups of edge blades are in 120-degree central rotational symmetry about the central axis.

6. A three-edged woodworking through-hole gang drill as claimed in claim 1, wherein three sets of first cutting edges (31) intersect at a point in the feed direction to form a central point; the center point is located on the center axis, and the height of the center point in the feeding direction is higher than the first cutting edge (31) and the second cutting edge (32).

7. The three-blade woodworking through-hole gang drill according to claim 1, wherein a clamping plane (11) is arranged on the side surface of the tool shank (1), and the clamping plane (11) is parallel to the feeding direction; the other parts of the side surface of the knife handle (1) are cylindrical surfaces.

8. The three-edge woodworking through-hole gang drill according to claim 1, wherein the side surface of the tool shank (1) is connected with the bottom surface of the tool shank (1) by a chamfer (12); the spiral cutting part (2) is connected with the cutter handle (1) through a conical connecting surface (15).

9. A three-edged woodworking through-hole gang drill as claimed in claim 1, wherein the helical cutting part (2) or the helical cutting edge (21) is made of wear-resistant cemented carbide.

10. A three-edged woodworking through-hole gang drill as claimed in claim 1, characterized in that the drill tip (3) and the helical cutting part (2) are welded by means of a conical surface having a cone angle of 120 °.

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