CN212350471U

CN212350471U - Three-section type deep hole gun drill

Info

Publication number: CN212350471U
Application number: CN202020727376.3U
Authority: CN
Inventors: 张华林; 张友林
Original assignee: Dongguan Shuangli Cutting Tool Co ltd
Current assignee: Dongguan Shuangli Cutting Tool Co ltd
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2021-01-15
Anticipated expiration: 2030-05-07

Abstract

The utility model relates to a syllogic deep hole gun drill, include the cylindrical tungsten steel tool bit that is formed by preceding middle and back three-section coaxial welding, tool bit parallel arrangement has first cooling hole, second cooling hole and chip groove, the external diameter of middle section tool bit is less than the external diameter of anterior segment tool bit and back end tool bit in order to form sunken oil feed tank, the grinding part of anterior segment tool bit is provided with first back angle face, the second back angle face, knife tip back angle face, interior sword back angle face, cross the oil face, lead the angle face, the edge of outer sword setting between first back angle face and chip groove, outer sword is 30 for radial planar angle, the edge between sword back angle face and the chip groove tool bit including the interior sword setting, interior sword is 20 for radial planar angle, the knife tip be located tool bit third diameter department. The utility model discloses three-section coaxial welding forms around the tool bit falls into, and the anterior segment tool bit plays the cutting action, and the middle section tool bit plays the guard action, and the back end tool bit plays direction stabilizing action, does not make the rifle drill swing, improves deep hole machining's precision.

Description

Three-section type deep hole gun drill

Technical Field

The utility model relates to a deep hole gun drill processing technology field, in particular to syllogic deep hole gun drill.

Background

Gun drills were first developed to meet the requirements for the manufacture of barrels which were manufactured from a metal strip wound and welded onto a mandrel before the process came into operation. With the continuous development and improvement of gun drill processing equipment, the capability of a gun drill for processing small-diameter precise deep holes enables the gun drill to be widely applied to industries such as energy, automobiles, aviation, molds and the like. In the production process of automobile accessories, such as deep hole processing of forged rails, common rails, mold hot runners, mold cross holes, bicycle/motorcycle axles and damping series, the problems of product hole site deviation, unsmooth hole wall, easy drill bit breakage, short service life of the drill bit and the like easily occur in the processing of the traditional drill bit due to the fact that the requirement of the hole on the center position of a product is high and the requirement on the smoothness of the inner wall of the hole is strict.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides a syllogic deep hole gun drill.

In order to achieve the above purpose, the utility model provides a technical scheme does: a three-section deep hole gun drill comprises a cylindrical tungsten steel tool bit formed by coaxially welding a front section, a middle section and a rear section, wherein the tool bit is provided with a first cooling hole, a second cooling hole and a chip groove in parallel, the outer diameter of the middle section tool bit is smaller than the outer diameters of the front section tool bit and the rear section tool bit so as to form a sunken oil inlet groove, a grinding part of the front section tool bit is provided with a first rear angle surface, a second rear angle surface, a tool nose rear angle surface, an inner blade rear angle surface, an oil passing surface and a lead angle surface, an outer blade is arranged on the edge between the first rear angle surface and the chip groove, the angle of the outer blade relative to a radial plane is 30 degrees, and the angles of the first rear angle surface and the second rear angle surface relative to a cutting inclined plane formed by the outer blade are respectively 12; the angle of the nose rear angle surface relative to the radial plane is 25 degrees; the inner blade is arranged on the edge between the inner blade back angle surface and the chip groove, the angle of the inner blade relative to a radial plane is 20 degrees, the angle of the inner blade back angle surface relative to a cutting inclined plane formed by the inner blade is 12 degrees, the angle of the oil passing surface relative to the radial plane is 30 degrees, the angle of the angle guiding surface relative to the oil passing surface is 20 degrees, and the cutter point of the cutter head is positioned at one third of the diameter of the cutter head.

In the above technical scheme, the first cooling hole penetrates through a position between the tool nose back angle surface and the inner blade back angle surface, the second cooling hole penetrates through a position between the inner blade back angle surface and the oil passing surface, and the chip discharge groove is a 116-degree V-shaped groove.

In the technical scheme, the width of the oil inlet groove is 3mm, the depth of the oil inlet groove is 0.15mm, and the projection length of the outer blade on the radial plane is 0.5-1 mm.

In the technical scheme, the axis of the tool bit is positioned in the chip groove, and the distance from the groove bottom of the chip groove to the axis of the tool bit is 0.2-0.3 mm.

In the above technical solution, the aperture of the first cooling hole is larger than the aperture of the second cooling hole.

In the above technical solution, a ratio of the hole diameter of the first cooling hole to the hole diameter of the second cooling hole is 37: 27.

In the above technical scheme, a first front support guide part and a second front support guide part are arranged on the cylindrical surface of the front section cutter head, the first front support guide part covers the cylindrical surface of the front section cutter head within a range of 90 degrees, and the second front support guide part is located at the edge of the chip groove.

In the technical scheme, the cylindrical surface of the rear-section cutter head is provided with a first supporting guide part, a second supporting guide part, a third supporting guide part and a fourth supporting guide part at intervals along the clockwise direction, the first supporting guide part and the fourth supporting guide part are respectively positioned on the edges of the two sides of the chip discharge groove, the center of the second supporting guide part is 91 degrees away from the center of the first supporting guide part, and the center of the third supporting guide part is 62 degrees away from the center of the fourth supporting guide part.

In the above technical solution, the width of the first support guide portion is smaller than the width of the fourth support guide portion, and the width of the fourth support guide portion is smaller than the widths of the second support guide portion and the third support guide portion.

The utility model has the advantages that the utility model has reasonable structure, novel design and strong practicability, the tool bit is divided into a front section, a middle section and a rear section which are coaxially welded, and the front section tool bit plays a cutting role and is responsible for cutting out hole sites on products; the middle section cutter head is kept away to form an oil inlet groove for cooling oil to flow, so that the gun drill is protected; the rear section tool bit plays a role in guiding and stabilizing, the gun drill does not swing, the precision of deep hole machining is further improved, the qualification rate of deep hole machining products is greatly improved, the use faults of the gun drill are reduced, and the machining process of some industries is optimized (for example, the inner hole of a runner rod of a hot runner does not need to be ground).

Drawings

Fig. 1 is a schematic view of the structure of the grinding angle of the present invention.

Fig. 2 is an axial structure diagram of the present invention.

Fig. 3 is a schematic view of the cross-sectional structure a-a in fig. 1.

Fig. 4 is a schematic view of the cross-sectional structure B-B in fig. 1.

In the figure: 1. a front section cutter head; 2. a middle section cutter head; 21. an oil inlet groove; 3. a rear section cutter head; 4. a chip groove; 51. an inner blade; 52. a knife tip; 53. an outer blade; 54. a second rear corner face; 55. a nose back corner face; 56. an inner blade relief surface; 57. oil surface treatment; 58. a lead angle surface; 59. a first rear corner face; 61. a first cooling hole; 62. a second cooling hole; 71. a first front support guide; 72. a second front support guide; 81. a first support guide; 82. a second support guide; 83. a third support guide; 84. and a fourth support guide.

Detailed Description

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

As shown in fig. 1-4, a three-section deep hole gun drill includes a cylindrical tungsten steel tool bit formed by coaxially welding front, middle and rear sections, the tool bit is provided with a first cooling hole 61, a second cooling hole 62 and a chip groove 4 in parallel, the outer diameter of a middle section tool bit 2 is smaller than the outer diameters of a front section tool bit 1 and a rear section tool bit 3 to form a recessed oil inlet groove 21, a grinding part of the front section tool bit 1 is provided with a first rear corner surface 59, a second rear corner surface 54, a tool nose rear corner surface 55, an inner edge rear corner surface 56, an oil passing surface 57 and a corner guiding surface 58, an outer edge 53 is arranged at the edge between the first rear corner surface 59 and the chip groove 4, the angle of the outer edge 53 relative to a radial plane is 30 °, and the angles of the first rear corner surface 59 and the second rear corner surface 54 relative to cutting slopes formed by the outer edge 53 are 12 ° and 20 °; the nose relief surface 55 is at an angle of 25 ° relative to the radial plane; the inner edge 51 is arranged at the edge between the inner edge relief surface 56 and the chip groove 4, the angle of the inner edge 51 relative to a radial plane is 20 degrees, the angle of the inner edge relief surface 56 relative to a cutting bevel formed by the inner edge 51 is 12 degrees, the angle of the oil passing surface 57 relative to the radial plane is 30 degrees, the angle of the angle guiding surface 58 relative to the oil passing surface 57 is 20 degrees, and the cutting tip 52 of the cutter head is positioned at one third of the diameter of the cutter head.

The first cooling hole 61 penetrates between the nose back angle surface 55 and the inner edge back angle surface 56, the second cooling hole 62 penetrates between the inner edge back angle surface 56 and the oil passing surface 57, and the chip groove 4 is a 116-degree V-shaped groove.

The width of the oil inlet groove 21 is 3mm, the depth of the oil inlet groove 21 is 0.15mm, and the projection length of the outer blade 53 on the radial plane is 0.5-1 mm.

The axis of the tool bit is positioned in the chip groove 4, and the distance between the groove bottom of the chip groove 4 and the axis of the tool bit is 0.2-0.3 mm.

The first cooling holes 61 have a larger hole diameter than the second cooling holes 62. The ratio of the hole diameter of the first cooling hole 61 to the hole diameter of the second cooling hole 62 is 37: 27.

The cylindrical surface of the front section cutter head 1 is provided with a first front supporting guide part 71 and a second front supporting guide part 72, the first front supporting guide part 71 covers the cylindrical surface of the front section cutter head within the range of 190 degrees, and the second front supporting guide part 72 is positioned at the edge of the chip groove 4.

The cylindrical surface of the rear-section cutter head 3 is provided with a first supporting guide part 81, a second supporting guide part 82, a third supporting guide part 83 and a fourth supporting guide part 84 at intervals along the clockwise direction, the first supporting guide part 81 and the fourth supporting guide part 84 are respectively positioned at two side edges of the chip discharge groove 4, the center of the second supporting guide part 82 is 91 degrees apart from the center of the first supporting guide part 81, and the center of the third supporting guide part 83 is 62 degrees apart from the center of the fourth supporting guide part 84.

The width of the first support guide 81 is smaller than the width of the fourth support guide 84, and the width of the fourth support guide 84 is smaller than the widths of the second support guide 82 and the third support guide 83.

The gun drill is characterized in that the front section, the middle section and the rear section of the gun drill are coaxially welded in two modes, the first mode is formed by sequentially welding a cutter handle, a cutter bar and a cutter head, and the second mode is formed by welding a tungsten steel bar grinding cutter bar and a cutter head with the cutter handle.

The utility model has reasonable structure, novel design and strong practicability, the tool bit is divided into a front section, a middle section and a rear section which are coaxially welded, and the front section tool bit 1 plays a cutting role and is responsible for cutting hole sites of products; the middle section cutter head 2 is kept away to form an oil inlet groove 21 for cooling oil to flow, so that the gun drill is protected; the rear section tool bit 3 plays a role in guiding and stabilizing, the gun drill does not swing, the precision of deep hole machining is further improved, the qualification rate of deep hole machining products is greatly improved, the use faults of the gun drill are reduced, and the machining process of some industries (such as the inner hole of a runner rod of a hot runner does not need to be ground) is optimized.

The above is not intended to limit the technical scope of the present invention, and any modifications, equivalent changes and modifications to the above embodiments are all within the scope of the present invention.

Claims

1. A three-section deep hole gun drill is characterized by comprising a cylindrical tungsten steel tool bit formed by coaxially welding a front section, a middle section and a rear section, wherein the tool bit is provided with a first cooling hole, a second cooling hole and a chip removal groove in parallel, the outer diameter of the middle section tool bit is smaller than that of the front section tool bit and the rear section tool bit so as to form a sunken oil inlet groove, a grinding part of the front section tool bit is provided with a first rear angle surface, a second rear angle surface, a tool nose rear angle surface, an inner edge rear angle surface, an oil passing surface and a lead angle surface, an outer edge is arranged at the edge between the first rear angle surface and the chip removal groove, the angle of the outer edge relative to a radial plane is 30 degrees, and the angles of the first rear angle surface and the second rear angle surface relative to a cutting inclined plane formed by the outer edge are respectively 12; the angle of the nose rear angle surface relative to the radial plane is 25 degrees; the inner blade is arranged on the edge between the inner blade back angle surface and the chip groove, the angle of the inner blade relative to a radial plane is 20 degrees, the angle of the inner blade back angle surface relative to a cutting inclined plane formed by the inner blade is 12 degrees, the angle of the oil passing surface relative to the radial plane is 30 degrees, the angle of the angle guiding surface relative to the oil passing surface is 20 degrees, and the cutter point of the cutter head is positioned at one third of the diameter of the cutter head.

2. The three-stage deep hole gun drill according to claim 1, wherein the first cooling hole penetrates between the nose back angle surface and the inner edge back angle surface, the second cooling hole penetrates between the inner edge back angle surface and the oil passing surface, and the chip removal groove is a 116 ° V-shaped groove.

3. The three-stage deep hole gun drill according to claim 2, wherein the oil feed groove has a width of 3mm, a depth of 0.15mm, and a projection length of the outer blade on a radial plane of 0.5-1 mm.

4. A three-stage deep hole gun drill according to claim 3, wherein the bit axis is located in a flute, the flute bottom of the flute being 0.2-0.3mm from the bit axis.

5. The three-stage deep hole gun drill according to claim 4, wherein the diameter of the first cooling hole is larger than the diameter of the second cooling hole.

6. The three-stage deep hole gun drill according to claim 5, wherein the ratio of the diameter of the first cooling hole to the diameter of the second cooling hole is 37: 27.

7. The three-stage deep hole gun drill according to claim 6, wherein the cylindrical surface of the front section bit is provided with a first front support guide part and a second front support guide part, the first front support guide part covers the cylindrical surface of the front section bit within 90 degrees, and the second front support guide part is located at the edge of the chip groove.

8. The three-section deep hole gun drill according to claim 7, wherein the cylindrical surface of the rear section bit is provided with a first support guide part, a second support guide part, a third support guide part and a fourth support guide part at intervals in the clockwise direction, the first support guide part and the fourth support guide part are respectively located on two side edges of the chip discharge groove, the center of the second support guide part is 91 ° apart from the center of the first support guide part, and the center of the third support guide part is 62 ° apart from the center of the fourth support guide part.

9. The three-stage deep hole gun drill according to claim 8, wherein the width of the first support guide is smaller than the width of the fourth support guide, and the width of the fourth support guide is smaller than the widths of the second support guide and the third support guide.