Hard alloy drill bit with cooled inner hole

Abstract

The invention relates to the field of alloy drill bits, in particular to a hard alloy drill bit with an inner hole cooled. According to the hard alloy drill bit with the cooled inner hole, the cooling pipe for conveying the cooling liquid and the cooling spherical shell are arranged in the alloy drill bit body, the cooling pipe is divided into the liquid conveying channel and the backflow channel through the main partition plate, and the circulation effect of the cooling liquid in the cooling pipe and the cooling spherical shell is improved; the alloy drill bit is subjected to conventional cooling treatment only through the cooling liquid in the cooling pipe and the cooling spherical shell, and in the deep drilling treatment work, the piston is controlled to downwards leave the cooling spherical shell, so that the cooling liquid can be downwards drained into the inner hole structure of the alloy drill bit, and the cooling effect is improved. The technical problems that high-pressure cooling liquid is conveyed in an inner hole of an alloy drill bit for a long time, a large amount of cooling liquid is wasted, and additional vibration is generated to affect the drilling machining precision are solved.

Description

Technical Field

[0001] The invention relates to the field of alloy drill bits, in particular to a hard alloy drill bit with inner hole cooling. Background Art

[0002] When the drilling depth of the carbide drill is large, such as the drilling depth is more than 5 times the hole diameter, the internal cooling technology of the alloy drill is the preferred option. The high-pressure, high-flow coolant is injected into the alloy drill through the inner hole and sprayed directly onto the cutting edge, effectively taking away the heat and debris from the drill surface, while also performing cooling from the inside of the alloy drill. However, when the inner hole of the alloy drill is long, the delivery pressure required for the coolant injected into the inner hole of the alloy drill is large, and the long-term delivery of high-pressure coolant in the inner hole of the alloy drill will not only consume a large amount of coolant and cause waste, but also in the process of high-pressure coolant being sprayed out of the alloy drill, before the alloy drill has drilled deep into the workpiece, the lower end of the alloy drill will produce additional violent vibrations due to the loss of firm support, affecting the drilling accuracy of the alloy drill. Summary of the Invention

[0003] In order to overcome the disadvantages of delivering high-pressure coolant to the inner hole of an alloy drill bit for a long time, which not only causes a large amount of coolant waste but also generates additional vibration affecting the drilling processing accuracy, the present invention provides a cemented carbide drill bit with inner hole cooling.

[0004] The technical implementation scheme of the present invention is: a carbide drill bit with inner hole cooling, comprising an alloy drill bit body, a cooling tube, a cooling spherical shell, a piston, a main partition plate and an inner partition plate; a threaded groove structure is provided on the outer surface of the alloy drill bit body; an inner hole structure is provided inside the alloy drill bit body; a cooling tube and a cooling spherical shell are fixedly connected to the inside of the alloy drill bit body in sequence, and the lower end of the cooling tube is connected to the cooling spherical shell; the cooling tube and the cooling spherical shell are both made of heat transfer material; a plurality of infusion hole structures connected to the inner hole structure are provided in the alloy drill bit body; and the cooling spherical shell is provided with a plurality of infusion hole structures corresponding in number and position to the infusion hole structures. The through-hole structure is connected to the corresponding infusion hole structure; a piston is slidably connected to the inner hole structure of the alloy drill body; a plug structure corresponding to the number and position of the inner hole structure is provided on the piston, and the plug structure is plugged into the corresponding infusion hole structure; a main partition plate is fixedly connected to the cooling tube; the lower end of the main partition plate is fixedly connected to the cooling spherical shell; a main reflux hole structure is provided on the lower side of the main partition plate; an inner partition plate is slidably connected to the main partition plate; the lower end of the inner partition plate is fixedly connected to the piston; a connecting channel structure is provided in the piston, and the upper outlet ends on both sides of the connecting channel structure are respectively aligned with the two sides of the inner partition plate.

[0005] Preferably, a plurality of internal reinforcing rib structures are provided in the inner hole structure of the alloy drill bit body.

[0006] Preferably, an inner reflux hole structure initially aligned with the main reflux hole structure is provided on the inner partition plate.

[0007] Preferably, the alloy drill bit body is provided with at least two liquid outlet structures connected to the inner hole structure.

[0008] Preferably, the outlet end of the liquid outlet structure is aligned with the thread groove structure of the alloy drill bit body.

[0009] Preferably, the piston is provided with at least two vertical hole structures penetrating in the up-down direction, and the vertical hole structures are aligned with the plug structure.

[0010] Preferably, a sealing plate is slidably connected to the inner lower portion of the alloy drill bit body; a compression spring is fixedly connected between the sealing plate and the alloy drill bit body.

[0011] Preferably, the lower end of the inner hole structure of the alloy drill bit body is provided with an inverted cone structure that contracts downward, and the inverted cone structure at the lower end of the inner hole structure is used to accommodate a compression spring.

[0012] Preferably, the piston and the sealing plate are made of wear-resistant and corrosion-resistant rubber materials, so that the piston and the sealing plate are less damaged when they are continuously flushed by the coolant for a long time.

[0013] Preferably, the sealing plate is located below the liquid outlet structure.

[0014] The present invention has the following advantages: a hard alloy drill bit with inner hole cooling of the present invention, a cooling pipe and a cooling spherical shell for conveying coolant are provided in the alloy drill bit body, the main partition plate divides the cooling pipe into an infusion channel and a reflux channel, an external coolant conveying device continuously conveys coolant to the cooling pipe and the cooling spherical shell while an external coolant recovery and suction device continuously sucks the coolant in the cooling pipe and the cooling spherical shell at the same time, thereby improving the circulation effect of the coolant in the cooling pipe and the cooling spherical shell on the basis of reducing the coolant conveying pressure, and in addition, in conventional drilling processing work, the alloy drill bit is conventionally cooled only by the coolant in the cooling pipe and the cooling spherical shell, while in deep drilling processing work, the piston is controlled to move downward away from the cooling spherical shell, so that the coolant can be drained downward to the inner hole structure of the alloy drill bit to improve the cooling effect; the technical problem of long-term high-pressure coolant conveying to the inner hole of the alloy drill bit not only causing a large amount of coolant waste, but also generating additional vibration affecting the drilling processing accuracy is overcome. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 Schematic diagram of the front cross-section of the alloy drill bit body of the present invention; Figure 3 It is a three-dimensional cross-sectional schematic diagram of the alloy drill body, cooling tube and cooling spherical shell of the present invention; Figure 4 is a schematic three-dimensional cross-sectional view of the alloy drill bit body of the present invention; Figure 5 It is a schematic three-dimensional cross-sectional view of the cooling tube and the cooling spherical shell of the present invention; Figure 6 It is a schematic three-dimensional cross-sectional view of the piston of the present invention.

[0016] Reference numerals in the figure: 1-alloy drill bit body, 101-thread groove structure, 102-inner hole structure, 103-infusion hole structure, 104-inner reinforcement rib structure, 105-liquid outlet hole structure, 2-cooling pipe, 3-cooling spherical shell, 301-through hole structure, 4-piston, 401-plug structure, 402-connecting channel structure, 403-vertical hole structure, 5-main partition plate, 501-main reflux hole structure, 6-inner partition plate, 601-inner reflux hole structure, 71-sealing plate, 72-compression spring. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0018] Example 1, a carbide drill bit with inner hole cooling according to the present invention, such as Figures 1-6As shown, it includes an alloy drill body 1, a cooling tube 2, a cooling spherical shell 3, a piston 4, a main partition plate 5 and an inner partition plate 6; a thread groove structure 101 is provided on the outer surface of the alloy drill body 1; an inner hole structure 102 is provided inside the alloy drill body 1; a plurality of inner reinforcing rib structures 104 are provided in the inner hole structure 102 of the alloy drill body 1, and the inner reinforcing rib structure 104 can improve the overall structural strength of the alloy drill body 1; the cooling tube 2 and the cooling spherical shell 3 are fixed to the inside of the alloy drill body 1 in sequence, and the lower end of the cooling tube 2 is connected to the cooling spherical shell 3; the cooling tube 2 and the cooling spherical shell 3 are both made of heat transfer material; a plurality of infusion hole structures 103 connected to the top of the inner hole structure 102 are provided in the alloy drill body 1; the cooling spherical shell 3 is provided with a through hole structure 301 corresponding to the number and position of the infusion hole structures 103, and the through hole structure 301 is connected to the corresponding infusion hole structure 103; the inner hole structure 102 of the alloy drill body 1 is slidably connected to The piston 4 is provided with a plug structure 401 corresponding to the number and position of the inner hole structure 102, and the upper end of the plug structure 401 is plugged into the corresponding infusion hole structure 103 and the through hole structure 301; the cooling tube 2 is fixed with a main partition plate 5; the lower end of the main partition plate 5 is fixed to the cooling ball shell 3; the lower side of the main partition plate 5 is provided with a main reflux hole structure 501, the main partition plate 5 divides the cooling tube 2 into an infusion channel and a reflux channel, and the upper end of the infusion channel of the cooling tube 2 is externally connected to the cooling ball shell 3; Coolant delivery equipment, the upper end of the reflux channel of the cooling pipe 2 is externally connected to the coolant recovery and suction equipment; the inner partition plate 6 is slidably connected to the main partition plate 5; the inner partition plate 6 is provided with an inner reflux hole structure 601 which is initially aligned with the main reflux hole structure 501; the lower end of the inner partition plate 6 is fixedly connected to the piston 4; the inner partition plate 6 is externally connected to the telescopic mechanism; a connecting channel structure 402 is provided in the piston 4, and the upper outlet ends on both sides of the connecting channel structure 402 are respectively aligned with the two sides of the inner partition plate 6.

[0019] The working steps of the alloy drill body 1 of the internal hole cooling cemented carbide drill of the present invention in conventional drilling processing are as follows.

[0020] After the alloy drill bit body 1 is installed on the processing machine tool, the motor drive mechanism on the processing machine tool controls the alloy drill bit body 1 to perform shallow hole drilling on the surface of the processing workpiece. At the same time, the coolant spraying system provided on the processing machine tool directly sprays coolant to the outer surface of the alloy drill bit body 1. The coolant sprayed by the coolant spraying system on the processing machine tool cools the outer surface of the alloy drill bit body 1. At the same time, the external coolant delivery device continuously delivers coolant to the infusion channel of the cooling pipe 2. After flowing through the cooling spherical shell 3, the coolant passes through the main reflux hole structure 501 of the main partition plate 5 and the inner reflux hole structure 601 of the inner partition plate 6 and flows to the reflux channel of the cooling pipe 2. At the same time, the external coolant delivery device continuously delivers coolant to the infusion channel of the cooling pipe 2. The recovery and suction device continuously sucks the coolant from the reflux channel of the cooling tube 2, so that the external coolant delivery device only needs to use a smaller delivery pressure. The external coolant recovery and suction device sucks the coolant with a smaller suction force, so that the coolant can continuously flow in the cooling tube 2 and the cooling spherical shell 3. The cooling tube 2 and the cooling spherical shell 3 continuously cool the inside of the alloy drill bit body 1 through the coolant flowing inside. At this time, there is no need to deliver the coolant in the cooling tube 2 and the cooling spherical shell 3 to the inner hole structure 102 of the alloy drill bit body 1. Therefore, there is no need to apply a large delivery pressure to the coolant to ensure that the coolant can flow smoothly between the cooling tube 2 and the cooling spherical shell 3.

[0021] The working steps of the alloy drill body 1 of the internal hole cooling cemented carbide drill of the present invention during deep drilling processing are as follows.

[0022] When the alloy drill bit body 1 needs to perform deep hole drilling on the processing workpiece, the alloy drill bit body 1 is first controlled by the motor drive mechanism on the processing machine tool to perform shallow hole drilling on the surface of the processing workpiece in the above-mentioned manner. At the same time, the coolant sprayed by the coolant spray system on the processing machine tool cools the outer surface of the alloy drill bit body 1, and the coolant flowing in the cooling tube 2 and the cooling spherical shell 3 cools the inside of the alloy drill bit body 1.

[0023] After completing the shallow hole drilling work on the processing part, the alloy drill body 1 is controlled by the motor drive mechanism on the processing machine to further drill a deep hole on the basis of the shallow hole drilled on the surface of the processing part. At this time, only a small amount of coolant sprayed by the coolant spray system on the processing machine can enter the deep hole to cool the outer surface of the lower end of the alloy drill body 1. At this time, the internal partition plate 6 is pushed by the external telescopic mechanism to drive the piston 4 to move downward, so that the plug structure 401 of the piston 4 moves downward away from the through-hole structure 301 of the cooling spherical shell 3 and the infusion hole structure 103 of the alloy drill body 1, until the piston 4 moves downward to the lower side of the inner hole structure 102 of the alloy drill body 1. At the same time, the coolant circulating in the cooling spherical shell 3 will successively pass through the through-hole structure 301 of the cooling spherical shell 3 and the infusion hole structure 103 of the alloy drill body 1 and downward into the inner hole structure 102. At this time, the inner The partition plate 6 blocks the main reflux hole structure 501 of the main partition plate 5, and the main partition plate 5 divides the cooling spherical shell 3 into an infusion channel and a reflux channel, and the inner partition plate 6 also divides the inner hole structure 102 of the alloy drill body 1 into an infusion channel and a reflux channel. Therefore, the coolant in the infusion channel of the cooling tube 2 needs to flow through the infusion channel of the cooling spherical shell 3 and the infusion channel of the inner hole structure 102 in turn, and the coolant then passes through the inner reflux hole structure 601 of the inner partition plate 6 and the connecting channel structure 402 of the piston 4 into the reflux channel of the inner hole structure 102 respectively. Finally, the coolant flows along the inner hole structure 102 through the reflux channel of the cooling spherical shell 3 and the reflux channel of the cooling tube 2 in turn, and is sucked away by the external coolant recovery and suction equipment, thereby realizing the cooling treatment of the interior of the alloy drill body 1 by the coolant continuously flowing through the cooling tube 2, the cooling spherical shell 3 and the inner hole structure 102.

[0024] During the process of the alloy drill bit body 1 drilling a deep hole on the surface of the processing part, the external coolant delivery equipment needs to apply a greater delivery pressure to the coolant to ensure that the coolant circulates in the cooling tube 2, the cooling spherical shell 3 and the inner hole structure 102. However, since the lower end of the alloy drill bit body 1 has been drilled deep into the processing part at this time, when the coolant with increased delivery pressure is applied to the inner hole structure 102, the lower end of the alloy drill bit body 1 can obtain limiting support from the inside of the processing part to avoid violent vibration, thereby ensuring that the alloy drill bit body 1 can stably carry out the drilling work of the processing part.

[0025] Example 2, based on Example 1, Figures 1-6 As shown, the alloy drill bit body 1 of this embodiment is provided with two liquid outlet structures 105 connected to the inner hole structure 102 ; the outlet ends of the two liquid outlet structures 105 are aligned with the thread groove structure 101 of the alloy drill bit body 1 .

[0026] During conventional drilling processing, the alloy drill bit body 1 has the plug structure 401 of the piston 4 in the initial state of being plugged into the corresponding through-hole structure 301 of the cooling spherical shell 3. Only a small amount of coolant in the cooling spherical shell 3 will pass through the plug structure 401 of the piston 4 and the inner hole structure 102 of the alloy drill bit body 1, and then flow out from the liquid outlet structure 105. Coolant continuously flows out of the liquid outlet structure 105, which can prevent the liquid outlet structure 105 from being blocked by debris. At the same time, it can also allow a small amount of coolant to circulate in the inner hole structure 102 of the alloy drill bit body 1 for a short period of time. On the basis of reducing the delivery pressure required for the coolant circulation, the coolant in the inner hole structure 102 is used to improve the cooling effect of the alloy drill bit body 1.

[0027] During the deep drilling process of the alloy drill bit body 1, the external telescopic mechanism pushes the inner partition plate 6 to drive the piston 4 to move downward to the bottom of the liquid outlet structure 105, so that a large amount of coolant in the cooling spherical shell 3 can pass through the through-hole structure 301 and the inner hole structure 102 of the alloy drill bit body 1, and then flow out from the liquid outlet structure 105, thereby increasing the flow rate of the coolant flowing out of the liquid outlet structure 105. The coolant flowing out of the liquid outlet structure 105 is downwardly coated on the outer surface of the alloy drill bit body 1 along the thread groove structure 101, thereby improving the cooling effect on the outer surface of the alloy drill bit body 1. At the same time, the flow rate of the coolant circulating in the inner hole structure 102 in a short period of time is also increased, thereby improving the cooling effect on the inside of the alloy drill bit body 1.

[0028] Example 3, based on Example 2, Figures 1-6 As shown, the piston 4 of this embodiment is provided with two vertical hole structures 403 penetrating in the up and down directions, and the vertical hole structures 403 are aligned with the plug structure 401; a sealing plate 71 is slidably connected to the inner lower part of the alloy drill bit body 1; a compression spring 72 is fixedly connected between the bottom of the sealing plate 71 and the alloy drill bit body 1; the lower end of the inner hole structure 102 of the alloy drill bit body 1 is provided with an inverted cone structure that shrinks downward, and the inverted cone structure at the lower end of the inner hole structure 102 is used to accommodate the compression spring 72; the piston 4 and the sealing plate 71 are both made of wear-resistant and corrosion-resistant rubber materials, so that the piston 4 and the sealing plate 71 are less damaged when continuously flushed by coolant for a long time; the sealing plate 71 is located below the two liquid outlet structures 105.

[0029] The sealing plate 71 seals the area of ​​the inner hole structure 102 below the liquid outlet structure 105, and only allows the coolant that passes downward through the vertical hole structure 403 of the piston 4 to be discharged outward when flowing through the liquid outlet structure 105, preventing the coolant from further flowing downward through the area below the inner hole structure 102 below the liquid outlet structure 105, and only allows a small amount of coolant to be discharged outward from the liquid outlet structure 105, which is beneficial to reducing the delivery pressure required for the coolant to circulate in the inner hole structure 102. When it is necessary to increase the cooling effect on the alloy drill bit body 1, when the external telescopic mechanism pushes the inner partition plate 6 to drive the piston 4 to move downward, the piston 4 directly pushes the sealing plate 71 to drive the compression spring 72 to compress downward, so that the coolant can further flow downward through the area below the liquid outlet structure 105 of the inner hole structure 102, thereby improving the cooling effect on the alloy drill bit body 1.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A carbide drill bit with internal bore cooling, comprising a carbide drill bit body (1); Its characteristics are: The invention also includes a cooling tube (2); a thread groove structure (101) is provided on the outer surface of the alloy drill body (1); an inner hole structure (102) is provided inside the alloy drill body (1); a cooling tube (2) and a cooling spherical shell (3) are fixedly connected to the inside of the alloy drill body (1), and the lower end of the cooling tube (2) is connected to the cooling spherical shell (3); the cooling tube (2) and the cooling spherical shell (3) are both made of heat transfer material; a plurality of infusion hole structures (103) connected to the inner hole structure (102) are provided in the alloy drill body (1); a through hole structure (301) corresponding in number and position to the infusion hole structure (103) is provided on the cooling spherical shell (3), and the through hole structure (301) is connected to the corresponding infusion hole structure (103); the alloy drill A piston (4) is slidably connected to the inner hole structure (102) of the body (1); a plug structure (401) corresponding in number and position to the inner hole structure (102) is provided on the piston (4), and the plug structure (401) is plugged into the corresponding infusion hole structure (103); a main partition plate (5) is fixedly connected to the cooling tube (2); the lower end of the main partition plate (5) is fixedly connected to the cooling spherical shell (3); a main reflux hole structure (501) is provided on the lower side of the main partition plate (5); an inner partition plate (6) is slidably connected to the main partition plate (5); the lower end of the inner partition plate (6) is fixedly connected to the piston (4); a connecting channel structure (402) is provided in the piston (4), and the upper outlet ends on both sides of the connecting channel structure (402) are respectively aligned with the two sides of the inner partition plate (6).

2. The internally-cooled carbide drill according to claim 1, wherein: A plurality of internal reinforcing rib structures (104) are provided in the inner hole structure (102) of the alloy drill bit body (1).

3. The internally-cooled carbide drill according to claim 1, wherein: An inner reflux hole structure (601) is provided on the inner partition plate (6) and is initially aligned with the main reflux hole structure (501).

4. A cemented carbide drill with inner hole cooling according to any one of claims 1 to 3, characterized in that: The alloy drill bit body (1) is provided with at least two liquid outlet structures (105) connected to the inner hole structure (102).

5. The internally-cooled carbide drill according to claim 4, characterized in that: The outlet end of the liquid outlet hole structure (105) is aligned with the thread groove structure (101) of the alloy drill bit body (1).

6. The internally-cooled carbide drill according to claim 4, characterized in that: The piston (4) is provided with at least two vertical hole structures (403) penetrating in the vertical direction, and the vertical hole structures (403) are aligned with the plug structure (401).

7. The internally-cooled carbide drill according to claim 6, characterized in that: A sealing plate (71) is slidably connected to the inner lower portion of the alloy drill bit body (1); a compression spring (72) is fixedly connected between the sealing plate (71) and the alloy drill bit body (1).

8. The internally-cooled carbide drill according to claim 7, characterized in that: The lower end of the inner hole structure (102) of the alloy drill bit body (1) is provided with an inverted cone structure that contracts downwards, and the inverted cone structure at the lower end of the inner hole structure (102) is used to accommodate the compression spring (72).

9. The internally-cooled carbide drill according to claim 8, characterized in that: The piston (4) and the sealing plate (71) are both made of wear-resistant and corrosion-resistant rubber materials, so that the piston (4) and the sealing plate (71) are less damaged when they are continuously flushed by the coolant for a long time.

10. The internally-cooled carbide drill according to claim 7, characterized in that: The sealing plate (71) is located below the liquid outlet structure (105).

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