Inner-cooling twist drill

Abstract

The utility model relates to the technical field of twist drills, in particular to an inner-cooling twist drill which comprises a twist drill body, a cutting part and a clamping part are arranged at the two ends of the twist drill body respectively, the twist drill body is further provided with a liquid cooling channel, the cutting part is located at one end of the twist drill body, and the liquid cooling channel extends to the other end from the end face of one end of the twist drill body. The liquid cooling channel comprises the inner spiral channel, and by arranging the inner spiral channel, the advantage of lower noise is achieved.

Description

Technical Field

[0001] This application relates to the field of twist drill technology, and more specifically to an internally cooled twist drill. Background Technology

[0002] A twist drill is a tool that drills round holes in a workpiece by rotating its blades relative to a fixed axis. It gets its name from its spiral-shaped chip flutes, resembling a twisted rope. Internally cooled twist drills have lubricating oil flowing from inside the drill to the cutting area.

[0003] Patent document (CN204108419U) discloses an internally cooled twist drill, including a drill rod and a drill tip at the front end of the drill rod. The drill tip has chip removal grooves spirally arranged on both sides of the drill rod, with the two chip removal grooves corresponding to each other. The surface of the drill rod between the two chip removal grooves has a chip receiving groove. One side of the chip removal groove is an inwardly concave parabolic surface one, and a cutting edge is provided at the connection between the parabolic surface one and the chip receiving groove. The other side of the chip removal groove is an outwardly convex parabolic surface two, and the parabolic surface two is connected to the chip receiving groove. The drill tip has an internal cooling hole, which is connected to a liquid cooling channel on the drill rod. However: because the liquid cooling channel has a flat-walled tube surface, the coolant is prone to turbulence and direct impact on the tube wall when passing through the liquid cooling channel, generating high-frequency noise; secondly, because there are no obstructions at the top of the liquid cooling channel, when the internal cooling twist drill stops rotating, that is, when there is no need for cooling, the coolant in the external cooling tank may not be stopped in time, resulting in some coolant still flowing into the liquid cooling channel, resulting in waste.

[0004] Therefore, there is a need for an internally cooled twist drill that produces less noise and prevents coolant from flowing into the liquid cooling channel when the internally cooled twist drill stops. Summary of the Invention

[0005] The main objective of this application is to provide an internally cooled twist drill, wherein the internally cooled twist drill includes a twist drill body, the twist drill body having a cutting portion and a clamping portion at both ends, the twist drill body also having a liquid cooling channel, the cutting portion being located at one end of the twist drill body, the liquid cooling channel extending from one end face of the twist drill body to the other end face, the liquid cooling channel including an internal spiral channel, and by setting the internal spiral channel, the advantage of lower noise is achieved.

[0006] Another objective of this application is to provide an internally cooled twist drill, wherein the twist drill body has a water-blocking member at one end of the clamping part, the water-blocking member is slidably disposed on the clamping part and closes or opens the liquid cooling channel, and when the twist drill body rotates circumferentially, the water-blocking member opens the liquid cooling channel under the action of centrifugal force, thereby achieving the advantage of preventing coolant from flowing into the liquid cooling channel when the internally cooled twist drill stops rotating.

[0007] To achieve at least one of the above-mentioned inventive objectives, this application provides an internal cooling twist drill, wherein the internal cooling twist drill comprises:

[0008] The twist drill body has a cutting section and a clamping section at both ends, and also has a liquid cooling channel. The cutting section is located at one end of the twist drill body, and the liquid cooling channel extends from one end face of the twist drill body to the other end face. The liquid cooling channel includes an inner spiral channel.

[0009] In one or more embodiments of this application, a water-blocking member is provided at one end of the twist drill body having the clamping part. The water-blocking member is slidably disposed on the clamping part and closes or opens the liquid cooling channel. When the twist drill body rotates circumferentially, the water-blocking member opens the liquid cooling channel under the action of centrifugal force.

[0010] In one or more embodiments of this application, the liquid cooling channel includes an enlarged section, a tapered section, and a normal section. The enlarged section is located in the clamping part, the tapered section is located between the enlarged section and the normal section, and the normal section extends from the clamping part to the cutting part. The internal cooling twist drill also includes a first sleeve and a second sleeve. A helical element is fixedly disposed inside the second sleeve. The second sleeve is disposed in the normal section, and the bottom surface of the first sleeve abuts against the top surface of the second sleeve. The internal helical channel is the inner hole channel of the second sleeve where the helical element is disposed.

[0011] In one or more embodiments of this application, each of the water-blocking components includes a triangular component, a cylindrical component, and a spring. The sidewall of the enlarged section has a plurality of recesses arranged in a circular array. The triangular component is fixedly connected to the cylindrical component, and the cylindrical component is slidably disposed in the recesses. The two ends of the spring are respectively connected to the cylindrical component and the bottom wall of the recesses. All the triangular components are spliced ​​together to form a closed pseudo-circular shape.

[0012] In one or more embodiments of this application, the weight of the cylindrical member is greater than the weight of the triangular member.

[0013] In one or more embodiments of this application, the column is made of metal, the triangular member is made of plastic, the end of the column away from the spring has a slot, and one end of the triangular member has a protrusion that engages with the slot.

[0014] In one or more embodiments of this application, the sidewall of the slot has an injection hole, and after the protrusion is inserted into the slot, the injection hole is filled with glue.

[0015] In this embodiment, the internal cooling twist drill includes a twist drill body with a cutting portion and a clamping portion at both ends. The twist drill body also has a liquid cooling channel. The cutting portion is located at one end of the twist drill body, and the liquid cooling channel extends from one end face of the twist drill body to the other end face. The liquid cooling channel includes an internal spiral channel. By setting the internal spiral channel, the advantage of lower noise is achieved. Attached Figure Description

[0016] These and / or other aspects and advantages of this application will become clearer and more readily understood from the following detailed description of embodiments of this application taken in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 The figure shows a structural schematic diagram of an internal cooling twist drill according to this application;

[0018] Figure 2 The diagram shows... Figure 1 A magnified view of a portion at point C;

[0019] Figure 3 The diagram shows... Figure 1 A magnified view of a portion at point D;

[0020] Figure 4 The illustration shows a cross-sectional view of the water-blocking component. Detailed Implementation

[0021] The terms and words used in the following specification and claims are not limited to their literal meaning, but are used solely by the inventors to enable a clear and consistent understanding of this application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this application is provided for illustrative purposes only and not for the purpose of limiting the application as defined in the appended claims and their equivalents.

[0022] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0023] While ordinal numbers such as "first," "second," etc., will be used to describe various components, there is no limitation on which components are used herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the utility model concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising” and / or “having” as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0025] Indicative internal cooling twist drill, for reference Figures 1 to 4 According to a preferred embodiment of the present invention, an internal cooling twist drill, such as... Figure 1 As shown, the device includes a twist drill body 10, which has a cutting portion 101 and a clamping portion 102 at both ends. The twist drill body 10 also has a liquid cooling channel 103. The cutting portion 101 is located at one end of the twist drill body 10, and the liquid cooling channel 103 extends from one end face of the twist drill body 10 to the other end face. The liquid cooling channel 103 includes an inner spiral channel 1031.

[0026] It should be noted that after the coolant flows into the liquid cooling channel 103, since the liquid cooling channel 103 is an inner spiral channel 1031, after the coolant comes into contact with the spiral part inside the inner spiral channel 1031, the coolant rotates and falls along the spiral trajectory, forming a stable "water film laminar flow". This reduces the instantaneous pressure fluctuations caused by the vertical impact of the water flow on the pipe wall and reduces the noise from the water flow impact. In addition, the inner spiral channel 1031 can accelerate the centrifugal force of the coolant rotation, concentrate any air that may be present in the center of the pipe to form a stable air column, and reduce the mixing and collision of gas and liquid. Compared with the existing liquid cooling channel 103 which has a flat wall surface, this application has the advantage of lower noise.

[0027] Specifically, such as Figure 1 and Figure 2 As shown, the liquid cooling channel 103 includes an enlarged section 1032, a tapered section 1033, and a normal hole section 1034. The enlarged section 1032 is located in the clamping part 102, and the tapered section 1033 is located between the enlarged section 1032 and the normal hole section 1034. The normal hole section 1034 extends from the clamping part 102 to the cutting part 101. The internal cooling twist drill also includes a first sleeve 20 and a second sleeve 30. A spiral component 301 is fixedly disposed inside the second sleeve 30. The spiral component 301 is fixedly connected to the inner hole channel of the second sleeve 30 by welding. The second sleeve 30 is disposed inside the normal hole section 1034. The bottom surface of the first sleeve 20 abuts against the top surface of the second sleeve 30. The inner spiral channel 1031, i.e., the inner hole channel of the second sleeve 30, is provided with the spiral component 301.

[0028] It should be noted that by designing the second sleeve 30 and the twist drill body 10 separately, the processing difficulty is reduced. The outer walls of the first sleeve 20 and the second sleeve 30 are fixedly connected to the liquid cooling channel 103 by welding or bonding.

[0029] Furthermore, the twist drill body 10 has a water-blocking member 40 at one end of the clamping part 102. The water-blocking member 40 is slidably disposed on the clamping part 102 and closes or opens the liquid cooling channel 103. When the twist drill body 10 rotates circumferentially, the water-blocking member 40 opens the liquid cooling channel 103 under the action of centrifugal force.

[0030] It should be noted that by setting the water baffle 40 to open the liquid cooling channel 103 under the action of centrifugal force, when the twist drill body 10 stops rotating, the water baffle 40 closes the liquid cooling channel 103, thus preventing the coolant remaining in the external pipeline from flowing into the liquid cooling channel 103 and being wasted due to the valve of the external liquid cooling box not being shut off in time.

[0031] Specifically, such as Figure 3 and Figure 4 As shown, each of the water-blocking components 40 includes a triangular component 401, a cylindrical component 402, and a spring 403. The side wall of the enlarged section 1032 has a plurality of recessed holes 1035 arranged in a ring array. The triangular component 401 is fixedly connected to the cylindrical component 402. The cylindrical component 402 is slidably disposed in the recessed hole 1035 and passes through the first sleeve 20. The two ends of the spring 403 are respectively connected to the bottom wall of the cylindrical component 402 and the recessed hole 1035. All the triangular components 401 are spliced ​​together to form a closed pseudo-circular shape.

[0032] It should be noted that, under the elastic force of the spring 403, the triangular pieces 401 are normally joined together to form a closed pseudo-circular shape and seal the liquid cooling channel 103. When the twist drill body 10 rotates circumferentially, the triangular pieces 401 separate from each other and retract into the concave hole 1035.

[0033] In addition, in order to enable the triangular member 401 to overcome the elastic force of the spring 403 under the action of centrifugal force when the twist drill body 10 rotates circumferentially, compress the spring 403, and retract the triangular member 401 into the concave hole 1035, the weight of the column member 402 is greater than the weight of the triangular member 401.

[0034] More specifically, the columnar member 402 is made of metal, and the triangular member 401 is made of plastic. Furthermore, to achieve the connection between the triangular member 401 and the columnar member 402, as follows... Figure 3 and Figure 4As shown, the end of the column 402 facing away from the spring 403 has a slot 4021, and the end of the triangular member 401 has a protrusion 4011, which is inserted into the slot 4021.

[0035] In addition, to strengthen the connection, such as Figure 3 As shown, the side wall of the slot 4021 has a glue injection hole 4022. After the protrusion 4011 is inserted into the slot 4021, the glue injection hole 4022 is filled with glue. The triangular member 401 and the column member 402 are further connected by the glue.

[0036] In summary, the internally cooled twist drill described in the embodiments of this application is explained, which provides advantages such as lower noise and prevention of coolant flowing into the liquid cooling channel when the internally cooled twist drill stops rotating.

[0037] It is worth mentioning that, in this embodiment, the internal cooling twist drill has a simple structure, does not involve complex manufacturing processes or expensive materials, and is highly economical. At the same time, for manufacturers, the internal cooling twist drill provided in this application is easy to produce and inexpensive, which is more conducive to controlling production costs and further facilitates product promotion and use.

[0038] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The function and structural principle of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from these principles.

Claims

1. An internal cooling twist drill, characterized in that: The internal cooling twist drill includes The twist drill body has a cutting part and a clamping part at both ends, and the twist drill body also has a liquid cooling channel. The cutting part is located at one end of the twist drill body, and the liquid cooling channel extends from one end face of the twist drill body to the other end face. The liquid cooling channel includes an inner spiral channel.

2. The internal cooling twist drill according to claim 1, characterized in that: The twist drill body has a water-blocking component at one end of the clamping part. The water-blocking component is slidably disposed on the clamping part and closes or opens the liquid cooling channel. When the twist drill body rotates circumferentially, the water-blocking component opens the liquid cooling channel under the action of centrifugal force.

3. The internal cooling twist drill according to claim 2, characterized in that: The liquid cooling channel includes an enlarged section, a tapered section, and a normal hole section. The enlarged section is located in the clamping part, the tapered section is located between the enlarged section and the normal hole section, and the normal hole section extends from the clamping part to the cutting part. The internal cooling twist drill also includes a first sleeve and a second sleeve. A helical element is fixedly disposed inside the second sleeve. The second sleeve is disposed in the normal hole section, and the bottom surface of the first sleeve abuts against the top surface of the second sleeve. The internal helical channel is the inner hole channel of the second sleeve where the helical element is disposed.

4. The internal cooling twist drill according to claim 3, characterized in that: Each of the aforementioned water-blocking components includes a triangular component, a cylindrical component, and a spring. The sidewall of the enlarged section has several recessed holes arranged in a circular array. The triangular component is fixedly connected to the cylindrical component, and the cylindrical component is slidably disposed within the recessed hole. The two ends of the spring are respectively connected to the cylindrical component and the bottom wall of the recessed hole. All the triangular components are spliced ​​together to form a closed pseudo-circular shape.

5. The internal cooling twist drill according to claim 4, characterized in that: The weight of the cylindrical component is greater than the weight of the triangular component.

6. The internal cooling twist drill according to claim 5, characterized in that: The column is made of metal, the triangular piece is made of plastic, the end of the column away from the spring has a slot, and one end of the triangular piece has a protrusion that fits into the slot.

7. The internal cooling twist drill according to claim 6, characterized in that: The slot sidewall has an injection hole. After the protrusion is inserted into the slot, the injection hole is filled with glue.

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