Inner-cooling hard alloy bar

Abstract

The utility model belongs to the technical field of cutter machining, and discloses an inner-cooling hard alloy bar. The inner-cooling hard alloy bar comprises a cylindrical bar body, an inner-cooling hole is formed in the bar body, the inner-cooling hole extends in the length direction of the bar body and penetrates through the two ends of the bar body, the cross section of the inner-cooling hole is round, and the diameter of the inner-cooling hole accounts for 3.89%-21.67% of the diameter of the bar body. According to the inner-cooling hard alloy bar, cooling liquid can be directly conveyed to a cutting area through the inner-cooling holes, the machining temperature is remarkably reduced, heat damage and tool abrasion are reduced, the service life is prolonged, the hole diameters of the inner-cooling holes are reasonably set according to the diameter of the bar body, the structural strength of the bar can be guaranteed, and the cooling effect can also be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool processing technology, and in particular to an internally cooled cemented carbide bar. Background Technology

[0002] Carbide bars are a type of carbide cutting tool, characterized by stable mechanical properties, ease of welding, high wear resistance, and high impact resistance. They are widely used in machining various cutting tools such as drills, end mills, reamers, taps, and long-handled tools. Among carbide bars, those with internal cooling holes are one type. These bars utilize internal cooling, directly supplying coolant to the cutting area through the internal cooling holes, significantly reducing machining temperature, minimizing thermal damage and tool wear, and extending tool life.

[0003] For any diameter bar, the size of the internal cooling hole affects both the cooling efficiency and the structural strength of the bar. If the diameter of the internal cooling hole is set too large, it will affect the structural strength of the bar and thus the performance of the cutting tool. If the diameter of the internal cooling hole is set too small, it will reduce the cooling effect.

[0004] Therefore, there is an urgent need to provide an internally cooled cemented carbide bar to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an internally cooled hard alloy bar that can ensure both the structural strength of the bar and the cooling effect.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The internally cooled cemented carbide bar includes a cylindrical bar body with an internal cooling hole inside. The internal cooling hole extends along the length of the bar body and penetrates both ends of the bar body. The cross-section of the internal cooling hole is circular, and the diameter of the internal cooling hole accounts for 3.89% to 21.67% of the diameter of the bar body.

[0008] As an optional solution, at least two internal cooling holes are provided inside the main body of the bar.

[0009] As an alternative, at least two of the internal cooling holes are arranged in a spiral shape.

[0010] As an alternative, the pitch of the spiral-shaped internal cooling hole is 21.17 mm to 144.38 mm.

[0011] As an optional solution, the spiral angle of the internal cooling hole is 30° to 40°.

[0012] As an optional solution, the number of internal cooling holes is set to two, and the two internal cooling holes are arranged at intervals;

[0013] Alternatively, the number of internal cooling holes is set to three, with the three internal cooling holes spaced apart and evenly distributed along the circumference of the main body of the bar.

[0014] As an optional solution, the hole spacing between two adjacent internal cooling holes is 25% to 60% of the diameter of the main body of the bar.

[0015] As an optional solution, the diameter of the main body of the bar is in the range of 4mm to 26mm, the diameter of the internal cooling hole is in the range of 0.5mm to 2.6mm, and the hole spacing between two adjacent internal cooling holes is in the range of 1.7mm to 12.6mm.

[0016] As an optional solution, the circumferential surface of the bar body is provided with helical teeth.

[0017] As an alternative, the circumferential surface of the main body of the rod is smooth.

[0018] The beneficial effects of this utility model are:

[0019] This invention provides an internally cooled cemented carbide bar, comprising a cylindrical bar body with internal cooling holes extending axially along both ends of the bar body. Coolant is directly supplied to the cutting area through these internal cooling holes, significantly reducing machining temperature, minimizing thermal damage and tool wear, and extending tool life. The internal cooling holes have a circular cross-section, and their diameter is 3.89% to 21.67% of the diameter of the bar body. By rationally setting the diameter of the internal cooling holes according to the diameter of the bar body, both the structural strength of the bar and the cooling effect can be guaranteed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internally cooled hard alloy bar provided in the first optional embodiment of this utility model;

[0021] Figure 2 This is a side view of the internally cooled hard alloy bar provided in the first optional embodiment of this utility model;

[0022] Figure 3 This is a front view of the internally cooled cemented carbide bar provided in the first optional embodiment of this utility model;

[0023] Figure 4 This is a front view of the internally cooled hard alloy bar provided in the second optional embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of the internally cooled hard alloy bar provided in the third optional embodiment of this utility model;

[0025] Figure 6 This is a schematic diagram of the internally cooled hard alloy bar provided in the fourth optional embodiment of this utility model.

[0026] In the picture:

[0027] 1. Bar body; 11. Smooth surface; 12. Spiral teeth; 2. Internal cooling holes. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] This embodiment provides an internally cooled cemented carbide bar, belonging to the category of cemented carbide cutting tools. It features stable mechanical properties, ease of welding, high wear resistance, and high impact resistance, and is used to process various cutting tools such as drills, end mills, reamers, taps, and long-handled tools. Figure 1 As shown, the internally cooled hard alloy rod includes a cylindrical rod body 1, and an internal cooling hole 2 is provided inside the rod body 1. The internal cooling hole 2 extends along the length direction of the rod body 1 and passes through both ends of the rod body 1.

[0033] The internal cooling hole 2 serves as the inlet and outlet channel for the coolant. During use, the coolant enters through one end of the internal cooling hole 2, passes through the entire bar body 1, and flows out through the other end of the internal cooling hole 2, thereby cooling the bar and effectively protecting it. The internal cooling hole 2 can directly deliver coolant to the cutting area, significantly reducing the machining temperature, reducing thermal damage and tool wear, and extending tool life (20% to 50% longer than traditional tools). Furthermore, the efficient flow of coolant can inhibit chip adhesion and reduce downtime for cleaning. It is especially suitable for high-intensity scenarios such as deep hole machining and continuous cutting. Temperature rise control effectively reduces workpiece deformation and surface oxidation, improving machining accuracy and surface finish (roughness Ra value reduced by 10% to 30%).

[0034] It should be noted that the extension of the internal cooling hole 2 along the length of the bar body 1 only means that the extension direction of the entire internal cooling hole 2 is roughly along the length of the bar body 1, and does not specifically mean that it extends in a direction parallel to its length.

[0035] Optionally, at least two internal cooling holes 2 are formed inside the main body 1 of the bar. In this embodiment, as shown... Figure 2 and Figure 3 As shown, the internal cooling holes 2 can be configured as two, spaced apart, to ensure cooling efficiency. In another optional embodiment, as... Figure 4 and Figure 6 As shown, the internal cooling holes 2 can also be configured as three, with the three internal cooling holes 2 spaced apart and evenly distributed along the circumference of the bar body 1. Double holes are mainly used in double-edged cutting tools, and triple holes are mainly used in triple-edged cutting tools. Of course, in other embodiments, more than three internal cooling holes 2 can be configured as needed, and no specific limitation is made here.

[0036] In this embodiment, the two internal cooling holes 2 are arranged in a spiral shape, which can extend the flow path of the coolant, thereby further ensuring the cooling effect and effectively improving working efficiency.

[0037] For the spiral internal cooling hole 2, in order to simultaneously meet its machining convenience and cooling effect, its pitch and helix angle need to be set reasonably. Since the diameter of the cutting tool is very diverse, the internal cooling carbide bar also corresponds to a variety of specifications. For different specifications of bar, the pitch of the spiral internal cooling hole 2 can be selected from 21.17mm to 144.38mm, and the helix angle of the internal cooling hole 2 can be selected from 30° to 40°. Currently, the mainstream helix angles of the products are 30° and 40°.

[0038] like Figure 2 As shown, the cross-section of the internal cooling hole 2 is circular. For any specification of bar, the diameter d of the internal cooling hole 2 can account for 3.89% to 21.67% of the diameter D of the bar body 1, and more preferably 8% to 18%. Optionally, the diameter d of the internal cooling hole 2 can account for 4%, 7%, 10%, 13%, 16%, 19%, or 21% of the diameter D of the bar body 1. By rationally setting the diameter of the internal cooling hole 2 according to the diameter of the bar body 1, both the structural strength of the bar and the cooling effect can be guaranteed, avoiding the internal cooling hole 2 being too large or too small.

[0039] Optionally, the spacing between two adjacent internal cooling holes 2 is 25% to 60% of the diameter of the bar body 1, more preferably 28% to 55%. Alternatively, the spacing between two adjacent internal cooling holes 2 can be 25%, 30%, 35%, 40%, 45%, 50%, 55%, or 60% of the diameter of the bar body 1. By rationally setting the spacing between two adjacent internal cooling holes 2 according to the diameter of the bar body 1, uniform cooling can be achieved, ensuring the temperature uniformity of the entire bar.

[0040] In this embodiment, for bars of different specifications, the diameter of the bar body 1 ranges from 4mm to 26mm. Based on the above diameter range, the diameter of the internal cooling hole 2 ranges from 0.5mm to 2.6mm, and the hole spacing between two adjacent internal cooling holes 2 ranges from 1.7mm to 12.6mm.

[0041] Specifically, refer to Figure 2 and Figure 3Taking a double-hole cemented carbide bar with a helical angle of 30° for the internal cooling hole 2 as an example, when the diameter D of the bar body 1 is 4mm, the diameter d of the internal cooling hole 2 is 0.5mm to 0.65mm, the hole spacing w between the two internal cooling holes 2 is 1.7mm to 2.2mm, and the pitch of the helical internal cooling hole 2 is 21.17mm to 22.4mm. When the diameter D of the bar body 1 is 6mm, the diameter d of the internal cooling hole 2 is 0.5mm to 1.05mm, the hole spacing w between the two internal cooling holes 2 is 1.7mm to 2.9mm, and the pitch of the helical internal cooling hole 2 is 31.75mm to 33.59mm. When the diameter D of the bar body 1 is 10mm, the diameter d of the internal cooling hole 2 is 1.3mm to 1.7mm, the hole spacing w between two internal cooling holes 2 is 4.6mm to 5.1mm, and the pitch of the spiral internal cooling hole 2 is 53.33mm to 55.52mm. When the diameter D of the bar body 1 is 26mm, the diameter d of the internal cooling hole 2 is 2.2mm to 2.8mm, the hole spacing w between two internal cooling holes 2 is 11.4mm to 12.1mm, and the pitch of the spiral internal cooling hole 2 is 138.67mm to 144.38mm.

[0042] In summary, by rationally setting the diameter, spacing, and pitch of the internal cooling holes 2 according to the diameter of the main body 1 of the bar, both the structural strength of the bar and the cooling effect can be guaranteed.

[0043] In an optional embodiment, such as Figure 5 and Figure 6 As shown, the circumferential surface of the bar body 1 may be provided with helical teeth 12. In another optional embodiment, as... Figure 1 As shown, the circumferential surface of the main body 1 of the bar can also be a smooth surface 11.

[0044] It should be noted that internally cooled cemented carbide bars are divided into blank bars (i.e.,...) Figure 5 and Figure 6 Bar stock with helical teeth 12 on the middle circumference surface and precision ground bar stock (i.e. Figure 1 There are two main categories of rods (with a smooth surface 11 on the middle circumference). The helical angle, pitch, lead of the external helical teeth 12 and the internal cooling holes 2 are all corresponding. The function of the external helical teeth 12 is twofold: first, to provide lead and ensure helical angle during extrusion; second, to facilitate the detection of technical parameters such as helical angle, pitch, and lead after sintering (which cannot be detected by the internal cooling holes 2). Before the blank rod is made into a cutting tool, the helical teeth 12 on the outer surface must be ground off to form a finely ground rod. Then, according to the helical angle, lead, diameter and spacing of the internal cooling holes 2, the corresponding helical angle cutting tool is designed and ground.

[0045] The following are application examples, such as Figure 1 and Figure 3 As shown, this is a double-hole precision-ground bar with a smooth circumferential surface (11); as Figure 4 As shown, this is a three-hole precision-ground bar with a smooth circumferential surface (11); as Figure 5 As shown, this is a double-hole blank bar with helical teeth 12 on its circumferential surface; as Figure 6 As shown, this is a three-hole blank bar with helical teeth 12 on its circumferential surface.

[0046] Optionally, in this embodiment, whether it is a blank bar or a finely ground bar, its length can be up to 350mm. When it is processed into a cutting tool, it can be cut into the corresponding length according to the actual use.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A chilled carbide bar, characterized in that, The device includes a cylindrical rod body (1), and an internal cooling hole (2) is provided inside the rod body (1). The internal cooling hole (2) extends along the length direction of the rod body (1) and penetrates both ends of the rod body (1). The cross-section of the internal cooling hole (2) is circular, and the diameter of the internal cooling hole (2) accounts for 3.89% to 21.67% of the diameter of the rod body (1). At least two internal cooling holes (2) are provided inside the main body of the bar (1); The hole spacing between two adjacent internal cooling holes (2) accounts for 25% to 60% of the diameter of the main body of the rod (1); The diameter of the main body of the rod (1) ranges from 4mm to 26mm, the diameter of the internal cooling hole (2) ranges from 0.5mm to 2.6mm, and the hole spacing between two adjacent internal cooling holes (2) ranges from 1.7mm to 12.6mm.

2. The internally cooled cemented carbide bar according to claim 1, characterized in that, At least two of the internal cooling holes (2) are arranged in a spiral shape.

3. The internally cooled cemented carbide bar according to claim 2, characterized in that, The pitch of the spiral internal cooling hole (2) is 21.17 mm to 144.38 mm.

4. The internally cooled cemented carbide bar according to claim 2, characterized in that, The spiral angle of the internal cooling hole (2) is 30°~40°.

5. The internally cooled cemented carbide bar according to claim 1, characterized in that, The number of internal cooling holes (2) is set to two, and the two internal cooling holes (2) are arranged at intervals; Alternatively, the number of internal cooling holes (2) is set to three, with the three internal cooling holes (2) spaced apart and evenly arranged along the circumference of the main body of the bar (1).

6. The internally cooled cemented carbide bar according to any one of claims 1 to 5, characterized in that, The main body of the bar (1) is provided with helical teeth (12) on its circumferential surface.

7. The internally cooled cemented carbide bar according to any one of claims 1 to 5, characterized in that, The circumferential surface of the main body of the rod (1) is smooth (11).

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