Deep hole machining gun drill structure

Abstract

The utility model discloses a deep hole machining gun drill structure which comprises a drill rod body, a drill handle used for installation is sleeved outside the rear end portion of the drill rod body, a supporting belt is arranged on the front section portion of the drill rod body, an alloy drill tip is arranged on the front end portion of the supporting belt, and the outer diameter of the drill rod body, the outer diameter of the supporting belt and the outer diameter of the alloy drill tip are sequentially increased. Inclined surface transition is adopted at the transition position, two spiral grooves are symmetrically formed in the alloy drill tip and the supporting belt, straight grooves are symmetrically formed in the drill rod body, and the spiral grooves are communicated with the straight grooves to be used for chip removal. The supporting belt and the alloy drill tip are matched and combined, the self-locking type alloy drill tip is provided with double blades, machining efficiency is improved by 2-3 times, a blade core of the drill tip is in a self-centering type, coaxiality of machined holes is guaranteed, the machining double diameter can be deeper than before, a chip groove in the front portion is a small-angle spiral groove, and a straight groove is formed in the rear portion. And the body is a light shakeproof material cutter bar, so that the vibration generated in the machining process can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gun drill structures, in particular to a deep hole processing gun drill structure. Background Art

[0002] Machine clamp gun drill, also known as deep hole drill, is a commonly used hole processing tool in mechanical manufacturing and industrial production.

[0003] Widely used. Gun drills can be used not only to process deep holes (diameter-to-length ratio 1:250), but also to process shallow holes (diameter-to-length ratio 1:1). Gun drills usually consist of three parts: a drill shank, a drill rod, and a drill bit, with a through hole in the middle. They are suitable for drilling cast iron, carbon steel, copper, aluminum alloy, alloy steel, etc.

[0004] The earliest deep-hole drills were integrated gun drills. Their heads consisted of a carbide-welded cutter head, which relied on end cutting edges and inner and outer cutting edges, supported by an oil gap. These drills were difficult to replace, inefficient to manufacture, and expensive to manufacture for non-standard applications. However, they were only suitable for processing holes with a diameter of less than φ10.

[0005] After the upgrade, the gun drill uses end-blade blades for cutting, and is supported by two guide strips on the back. It is easy to replace and only requires changing the cutting edge angle, which has high processing efficiency. The blades are standard products, but the non-standard manufacturing cost of the tool rod is high, and it is mostly used to process holes with a diameter of more than φ10. For example, the patent publication number is: CN 215880023 U, which discloses a gun drill bit with a support strip, including a gun drill bit body, a blade and a support strip; the drill bit body is inverted conical, and there is a V-shaped chip groove on the side of the drill bit body: the blade is on one side of the V-shaped chip groove of the drill bit head; the support strip is located in the middle of the drill bit body and is threadedly connected to the lower end face of the V-shaped chip groove; the sum of the tangent circle diameter at the support strip and the thickness of the support strip is equal to the tangent circle diameter at the blade edge; in order to prevent the blade edge from damaging the inner hole wall of the workpiece when the machine-clamped gun drill is retracted after the drilling process is completed.

[0006] Moreover, the cutting edge during the processing is a complete straight edge. The aluminum chips generated by the gun drill with this structural form when processing aluminum alloys must be relatively wide and long. The amount of chips removed per unit time is large. In order to ensure that the chips are removed quickly and smoothly within the limited chip groove space, the requirements for the chips generated by the processing are very strict. Neither the width nor the length can be too large. Moreover, the tool often breaks during the processing, and a stable service life cannot be guaranteed. The practical life of the tool is shortened, and the efficiency of the production line is affected, which seriously restricts the output of the production line. Utility Model Content

[0007] The purpose of the utility model is to overcome the defects and shortcomings of the prior art, provide a deep hole processing gun drill structure, and solve various problems existing in the prior art.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A deep hole processing gun drill structure includes a drill rod body, a drill shank for installation is provided on the outer shell of the rear end of the drill rod body, a support belt is provided on the front section of the drill rod body, and an alloy drill tip is provided on the front end of the support belt. The outer diameters of the drill rod body, the support belt and the alloy drill tip increase in sequence, and an inclined transition is adopted at the transition point. Two symmetrical spiral grooves are provided on the alloy drill tip and the support belt, and a symmetrical straight groove is provided on the drill rod body. The spiral groove is connected to the straight groove for chip removal.

[0010] A stepped locking surface is provided on the outer circumferential surface of the drill shank, and a cooling hole penetrating the drill rod is provided at the rear end.

[0011] There are two liquid outlet holes of the cooling hole, which are symmetrically arranged on the conical end surface of the alloy drill tip and close to the spiral groove.

[0012] A drill neck is provided between the drill shank and the drill rod body. The rear end of the drill neck is provided with a depth fine-adjusting thread section for connection, and the front end of the drill neck is provided with a tapered section.

[0013] The drill rod body is made of light shockproof material.

[0014] The components of the drill rod body of the lightweight shockproof material are C 0.5-0.7, Si 1-1.2, Mn 0.2-0.4, Cr 5-5.2, Mo 1.3-1.5, and V 1.4-1.6.

[0015] The spiral groove position of the alloy drill tip forms a main cutting edge, and the drill tip angle of the alloy drill tip is 120°-160°; the main cutting edge angle is 20°-24°.

[0016] The angle of the spiral cutting edge at the rear end of the alloy drill tip is 10-14°.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The present application firstly adopts a structural setting of a support belt and an alloy drill tip, which is large at the front and small at the back. The combination of the two creates a self-locking alloy drill tip with a double-edged tip, which increases processing efficiency by 2-3 times. The drill tip core is self-centering, and the tip of the alloy drill tip is a conical tip structure. The size of its top angle determines the thickness of the chips and the direction of the chip flow. The thickness and flow of the chips will affect the chip breaking effect. When processing deep holes in aluminum alloys, the chips are much smaller than those of traditional gun drills.

[0019] The support belt structure ensures that the drill tip does not deviate after entering the hole, thus ensuring the coaxiality of the hole.

[0020] Through the structure of the spiral groove at the front end, when the alloy drill tip just enters the hole, the iron chips are in the form of threads, and the small spiral angle is conducive to chip removal; after the alloy drill tip is completely in the hole, the iron chips are in the form of fragments, which is conducive to chip removal. The straight groove at the rear end makes chip removal relatively smooth.

[0021] The cooling holes are made according to the processing hole diameter. The cooling system flushes out the iron chips straightly. If it is spiral, it blocks the iron chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the present utility model.

[0023] Figure 2 It is the main view of the utility model.

[0024] Figure 3 This is a schematic structural diagram of the utility model observed from the end.

[0025] Reference numerals:

[0026] 1. Drill pipe body; 2. Drill shank; 3. Support belt; 4. Alloy drill tip; 5. Spiral groove; 6. Straight groove; 7. Step locking surface; 8. Cooling hole; 9. Depth fine-adjustment thread section; 10. Main cutting edge; 11. Spiral cutting edge; 12. Liquid outlet. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See attached Figure 1-3 ;

[0029] A deep-hole drilling gun drill structure includes a drill rod body 1, with a drill shank 2 mounted on the rear end of the drill rod body 1. A support band 3 is provided at the front end of the drill rod body 1, and an alloy drill tip 4 is provided at the front end of the support band 3. The outer diameters of the drill rod body 1, support band 3, and alloy drill tip 4 increase in size, with beveled transitions at the transition points. The alloy drill tip 4 and support band 3 are symmetrically provided with two spiral grooves 5, and the drill rod body 1 is provided with symmetrical straight grooves 6, which communicate with the spiral grooves 5 for chip removal. The double-edged drill tip increases machining efficiency by 2-3 times. The self-centering drill tip core ensures the coaxiality of the machined hole, allowing for deeper machining diameters than before. The front chip removal groove is a small-angle spiral groove, while the rear portion is a straight groove.

[0030] Furthermore, the outer circumference of the drill shank 2 is provided with a stepped locking surface 7, and the rear end is provided with a cooling hole 8 that penetrates the drill rod. Two outlet holes 12 of the cooling hole 8 are symmetrically arranged on the tapered end face of the alloy drill tip, near the spiral groove. During operation, the cooling system can flush out iron chips in a straight line. A drill neck is provided between the drill shank 2 and the drill rod body 1. The rear end of the drill neck is provided with a depth fine-tuning threaded section 9 for connection, and the front end of the drill neck is provided with a tapered section. The depth fine-tuning thread is used to adjust the depth connection position according to the depth of the drill hole.

[0031] Furthermore, the drill rod body 1 is made of a lightweight, shock-absorbing material. The composition of the drill rod body 1 is C 0.5-0.7, Si 1-1.2, Mn 0.2-0.4, Cr 5-5.2, Mo 1.3-1.5, and V 1.4-1.6. This lightweight, shock-absorbing material reduces vibration during machining.

[0032] Furthermore, the main cutting edge 10 is formed at the position of the spiral groove 5 of the alloy drill tip 4, and the drill tip angle of the alloy drill tip 4 is 120°-160°; the angle of the main cutting edge 10 is 20-24°. The drill tip angle is large enough to make the chips relatively thin, and can make the chips move backward along the spiral groove and the straight groove, which has a high chip breaking efficiency. Especially when processing deep holes in aluminum alloys, the chips are much smaller than those of traditional gun drills, which is conducive to chip removal. The angle of the spiral cutting edge 11 at the rear end of the spiral groove 5 is 10-14°. Through the angle design of the front and rear ends of the spiral groove, on the one hand, the effect of cutting during the chip removal process can be achieved through the change of the angle. During operation, the iron chips are in the form of filaments when the alloy drill tip just enters the hole. Through the spiral angle, when the alloy drill tip completely enters the hole, the iron chips are in the form of fragments, which is conducive to chip removal.

[0033] When the gun drill with the above structure is working, the alloy drill tip first enters the position to be drilled. The support belt and the alloy drill tip are matched to form a structure that makes the front larger and the back smaller. The tip of the alloy drill tip is a cone tip structure. The size of its top angle determines the thickness of the chips and the flow direction of the chips. The thickness and flow direction of the chips will affect the chip breaking effect. The drill tip angle of the alloy drill tip is 120°-160°, and the optimal angle is 140°. The support belt structure ensures that the tool rod is supported and does not deviate after the alloy drill tip enters the hole, thereby ensuring the coaxiality of the hole. The spiral groove structure has a main cutting edge angle of 20-24°, and the angle of the spiral cutting edge at the rear end of the spiral groove is 10-14°. When processing deep holes in aluminum alloys, the chips are much smaller than those of traditional gun drills. During operation, the iron chips are in a filamentous state when the alloy drill tip just enters the hole, and the small spiral angle is conducive to chip removal; after the alloy drill tip completely enters the hole, the iron chips are in a fragmented state, which is conducive to chip removal. The straight groove at the rear end makes chip removal smoother, and the cooling holes are formulated according to the corresponding cooling holes according to the processing hole diameter. The cooling system flushes out the iron chips straightly. If it is spiral, it is to block the iron chips.

[0034] After installation and use, the processing time of the traditional alloy head gun drilling machine is 177 seconds for two pieces, while the processing time of the gun drilling machine with the structure of the present application can reach 34 seconds for two pieces, greatly improving work efficiency.

[0035] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0036] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. A deep hole machining gun drill structure, comprising a drill rod body (1), the rear end portion of the drill rod body (1) being provided with a drill shank (2) for installation, characterized in that: The front section of the drill rod body (1) is provided with a support belt (3), and the front end of the support belt (3) is provided with an alloy drill tip (4). The outer diameters of the drill rod body (1), the support belt (3) and the alloy drill tip (4) are successively larger, and a bevel transition is adopted at the transition point. Two symmetrically arranged spiral grooves (5) are provided on the alloy drill tip (4) and the support belt (3), and a symmetrically arranged straight groove (6) is provided on the drill rod body (1). The spiral groove (5) is connected to the straight groove (6) for chip removal.

2. The deep hole machining gun drill structure according to claim 1, characterized in that: A stepped locking surface (7) is provided on the outer circumferential surface of the drill shank (2), and a cooling hole (8) penetrating the drill rod is provided at the rear end.

3. The deep hole machining gun drill structure according to claim 2, characterized in that: There are two liquid outlet holes (12) of the cooling hole (8), which are symmetrically arranged side by side on the conical end face of the alloy drill tip, close to the spiral groove.

4. The deep hole machining gun drill structure according to claim 1, characterized in that: A drill neck is provided between the drill shank (2) and the drill rod body (1); a depth fine-adjusting threaded section (9) for connection is provided at the rear end of the drill neck; and a tapered section is provided at the front end of the drill neck.

5. The deep hole machining gun drill structure according to claim 1, characterized in that: The drill rod body (1) is made of light shockproof material.

6. The deep hole machining gun drill structure according to claim 1, characterized in that: The spiral groove (5) of the alloy drill tip (4) forms a main cutting edge (10), and the drill tip angle of the alloy drill tip (4) is 120°-160°; the angle of the main cutting edge (10) is 20°-24°.

7. The deep hole machining gun drill structure according to claim 1, characterized in that: The angle of the spiral cutting edge (11) at the rear end of the spiral groove (5) is 10-14°.

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