CN213674574U - Three-edge woodworking blind hole gang drill - Google Patents

Abstract

The application relates to the field of woodworking instruments, in particular to a three-blade woodworking blind hole gang drill. The three-edge woodworking blind hole gang drill is provided with a drill point, a spiral cutting part and a tool handle which are connected in sequence. The drill point is provided with three groups of side blades and cross blades which are rotationally symmetrical about the center of a central axis; 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 depth of a machining hole is different due to inconsistent abrasion degrees of each drill point under long-time abrasion is solved.

Description

Three-edge woodworking blind hole gang drill

Technical Field

The application relates to the field of woodworking instruments, in particular to a three-blade woodworking blind 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, because the wear loss of each drill bit in the long-time drilling process is different, the height of each drill bit in the feeding direction is easy to have a certain difference, which affects the processing depth of each processing hole, and thus affects the overall quality of the processing hole.

SUMMERY OF THE UTILITY MODEL

The application provides a three-edge woodworking blind 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 side edges and cross edges. Each set of edge and chisel edges is rotationally symmetric about the center axis. The bottom of the knife handle is provided with a threaded blind hole. And the threaded blind hole is provided with an adjusting screw during working.

Optionally, two adjacent sets of helical cutting edges and helical cutting grooves are rotationally symmetric about the central axis at 120 °. Two adjacent groups of edge blades and chisel blades are in 120-degree central rotational symmetry about the central axis. Under this setting, the chisel edge and the side edge of drill point and the spiral cutting edge and the spiral row of spiral cutting portion cut the groove and be even setting, can promote its job stabilization nature by the at utmost, restrain radial motion.

Optionally, the drill tip is provided with a center tip, and the center tip is arranged in the middle of one end of the drill tip in the feeding direction; the center point is higher than the height of the side and chisel edges in the feed direction. This setting can promote the position accuracy of processing hole.

Optionally, in order to facilitate clamping of the clamp, a clamping plane is arranged on the side surface of the tool shank, 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.

Optionally, the spiral cutting portion is connected with the tool shank by a fillet. The technical characteristics can be combined randomly so as to be convenient for connecting the clamp.

Optionally, an included angle between the side edge and the main motion direction is β, and a relief angle of the chisel edge is α, where β is greater than or equal to 25 ° and less than or equal to 50 °, and α is greater than or equal to 5 ° and less than or equal to 11 °. The gang drill has the advantages of proper feeding amount, high cutting strength and long service life.

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

Optionally, in order to improve the connection firmness of the drill tip and the spiral cutting portion, the drill tip and the spiral cutting portion are welded through a conical surface, and the conical angle of the conical surface is 120 °.

The three-edge woodworking blind hole gang drill is provided with a drill point, a spiral cutting part and a tool handle, wherein the two ends of the drill point and the spiral cutting part are respectively connected with the drill point and the tool handle. Particularly, the drill point is provided with three groups of side edges and cross edges which are rotationally symmetrical about the center of a central 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 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 blind hole gang drill possesses 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 form a support in three directions for the gang drill, 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 drill points of a plurality of gang drills can be quickly and conveniently set before machining, and the problem that the depth of a machined hole is different due to the fact that the heights of the drill points of the gang drills are not consistent under long-time abrasion 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 blind hole gang drill;

FIG. 2 is a schematic view of the front view structure of the three-blade woodworking blind hole gang drill;

FIG. 3 is a schematic view of the bottom view of the three-blade woodworking blind hole gang drill;

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

FIG. 5 is a schematic view of the cross-sectional structure A-A of FIG. 2;

FIG. 6 is a schematic view of a cross-sectional structure B-B in FIG. 2;

fig. 7 is a schematic view of the cross-sectional structure C-C of fig. 4.

The reference numbers in the figures illustrate:

1-cutter handle, 11-clamping plane, 12-chamfer, 13-threaded blind hole, 14-adjusting screw, 2-spiral cutting part, 21-spiral cutting edge, 22-spiral row cutting groove, 23-fillet, 3-drill point, 31-center point, 32-edge and 33-chisel edge.

Detailed Description

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

As shown in fig. 1, fig. 2 and fig. 5, the utility model provides a three-blade woodworking blind hole gang drill, as conventional setting, three-blade woodworking blind hole gang drill includes handle of a knife 1, spiral cutting portion 2 and drill point 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 blind hole gang drill comprises three groups of spiral cutting edges 21 and spiral row cutting grooves 22, each group of spiral cutting edges 21 and spiral row cutting grooves 22 is rotationally symmetrical about a central axis, wherein the central axis refers to an axial central axis of the spiral cutting part 2, the arrangement is that the shape and the size of each group of spiral cutting edges 21 and the shape and the size of each group of spiral cutting edges 22 are the same, the processing surfaces of the spiral cutting edges 21 are on the same cylindrical surface, and the arrangement is considered by the aperture uniformity and the hole surface smoothness of the processed hole. 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 32 and chisel edges 33, and likewise, each set of side edges 32 and chisel edges 33 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 helical cutting edges 21 and the helical row of flutes 22, which will not be described herein.

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 32 and chisel edges 33 are in 120-degree central rotational symmetry about the central axis; that is, each set of the helical cutting edges 21 and the helical rows of the flutes 22 is uniformly distributed in the helical cutting portion 2 and each set of the side edges 32 and the chisel edges 33 is uniformly distributed in the drill tip 3. Under this setting, every group spiral cutting edge 21 is more firm to spiral cutting portion 2 and the support of limit sword 32 to drill point 3, and every group spiral cutting edge 21, limit sword 32, chisel edge 33 eat sword volume, atress etc. comparatively even, are favorable to the stability when gang drill is processed to, the shortest life of three spiral cutting edges 21 of group, limit sword 32 and chisel edge 33 can promote, and the whole life of gang drill promptly can promote. 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. 2, 3 and 6, a threaded blind hole 13 is formed in the bottom of a tool shank 1 of the three-blade woodworking blind hole gang drill, the threaded blind hole 13 is provided with internal threads, an adjusting screw 14 is arranged inside the threaded blind hole 13 when the three-blade woodworking blind hole gang drill works and is used for drilling holes, and the depth of the adjusting screw 14 screwed 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 heights of the drill points 3 of all rows of drills are 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 the processing depth of each processing hole is kept consistent, and the overall quality of the processing hole is improved. When the woodworking gang drill is used for a long time, the abrasion degrees of the drill tips 3 are inconsistent, so that the machining depths of the machining holes are different, the overall quality is influenced, the conventional gang drill cannot adjust the difference in real time, and generally only can replace the drill tips with larger abrasion, and the mode cannot reduce or eliminate the error and has short overall service life of the drill tips 3. Three sword carpenter's blind hole gang drill can use the height of each drill point 3 of instant adjustment through the matching of screw thread blind hole 13 with adjusting screw 14 before processing to guarantee the depth of machining uniformity of each processing hole, can solve each drill point 3 high error and lead to its by force condemned problem (though other performances may still be up to standard) greatly in addition through the above-mentioned adjustment, thereby indirectly promote the life that drill point 3 was gang drill promptly.

As shown in fig. 1, 2 and 4, the drill point 3 is provided with a center point 31, the center point 31 is arranged in the middle of one end of the drill point 3 in the feeding direction, the height of the center point 31 in the feeding direction is higher than the height of the side edge 32 and the chisel edge 33, namely, the center point 31 is the part which firstly touches the workpiece during the punching process, and the arrangement of the center point 31 can accurately position the gang drill during the processing and improve the processing precision.

As shown in fig. 1, 2, and 4, 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 fillet 23. 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. 4 and 7, a preferred arrangement of the side edge 32 and the chisel edge 33 is: the included angle between the side edge 32 and the main motion direction is beta, the back angle of the cross edge 33 is alpha, wherein beta is more than or equal to 25 degrees and less than or equal to 50 degrees, and alpha is more than or equal to 5 degrees and less than or equal to 11 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. 6, 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 used as reference in the case where the drill tip 3 faces upward after the three-blade carpentry blind hole gang drill is normally assembled, and the bottom is the position facing downward under the reference system. In the present application, the feeding direction is the axial direction of the gang drill when the drilling operation is performed, and the main direction of movement is the direction of a rotational tangent to a point on the side edge 32 or the helical cutting edge 21 of the gang drill. 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 (9)

1. A three-edge woodworking blind 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 blind 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 (32) and cross edges (33), and each group of side edges (32) and cross edges (33) is rotationally symmetrical about the center of the central axis; 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 blind 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 (32) and chisel blades (33) are in 120-degree central rotational symmetry about the central axis.

3. A three-blade woodworking blind hole gang drill according to claim 1, wherein the drill tip (3) is provided with a center tip (31), and the center tip (31) is arranged in the middle of one end of the drill tip (3) in the feeding direction; the center point (31) is higher than the height of the side edge (32) and the chisel edge (33) in the feed direction.

4. The three-blade woodworking blind 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.

5. A three-edged woodworking blind hole gang drill as claimed in claim 1, characterized in that the side surface of the tool shank (1) is connected with the bottom surface of the tool shank (1) by a chamfer (12).

6. A three-edged woodworking blind hole gang drill as claimed in claim 1, characterized in that the helical cutting part (2) is connected with the shank (1) by a fillet (23).

7. A three-edged woodworking blind hole gang drill as claimed in claim 1, characterized in that the angle between the side edge (32) and the main direction of motion is β, and the relief angle of the chisel edge (33) is α, wherein β is not less than 25 ° and not more than 50 °, α is not less than 5 ° and not more than 11 °.

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

9. A three-edged carpenter's blind hole gang drill as claimed in claim 1, characterized in that said drill tip (3) and said helical cutting part (2) are welded by a conical surface having a cone angle of 120 °.

Images