Deep hole drill for drilling die steel

Abstract

The utility model discloses a deep hole drill for drilling die steel. The tool bit of the deep hole drill for drilling the die steel comprises a middle core body, a plurality of blades and a plurality of chip grooves, the middle core body sequentially comprises a cylindrical first core body, an inverted conical transition core body and a cylindrical second core body from bottom to top, and the diameter of the first core body is larger than that of the second core body; the cutter backs of the plurality of blade sections are arranged in an array manner relative to the circumference of the middle core body and are integrally connected to the outer circumferential wall of the middle core body, so that the cutter head forms a lower cutting section, a transition section and an upper clearance section from bottom to top; the chip grooves are formed by the knife backs of the blade sections and the middle core body in a surrounding mode, and the width of the first chip groove of the lower cutting section is smaller than that of the second chip groove of the upper clearance section. The drill bit has higher self strength and better chip removal performance, the service life of the drill bit is prolonged, the durability of the drill bit is improved, the cost is saved, and the yield is high.

Description

Technical Field

[0001] The utility model relates to the field of metal machining, and particularly relates to a deep hole drill for drilling die steel. Background Art

[0002] Deep hole machining has wide applications in the die industry, such as water channels, oil channels, air holes, single inclined holes, double inclined holes, screw through holes, ejector pin holes, etc. in dies; especially in the machining field of die steel with a hardness above HRC52°, deep hole machining solves the problems of thin holes and long holes that cannot be solved by ordinary drilling machines in die machining, effectively reducing the machining cost of dies. Its defects are as follows: First, in deep hole machining, the cutting situation of the tool cannot be directly observed, and only by working experience can one judge whether the cutting process is normal by listening to the sound during cutting, looking at the chips, feeling the vibration and the temperature of the workpiece by hand. Once the observation of the cutting situation of the tool is not in place and the current drill bit strength is insufficient to meet the cutting of high-hardness materials, the drill bit is likely to break in the hole, resulting in waste of cost and even scrapping of the workpiece. Therefore, when designing the drill bit, the strength and machining safety of the drill bit need to be considered; Second, after cutting, chips cannot be discharged in time and quickly, resulting in difficulty in stabilizing the cutting process, large cutting deformation, poor surface quality of the drilled hole, and at the same time, the cutting chips cannot be discharged in time, making it difficult for the cutting fluid to reach the bottom of the hole and the drill tip, unable to fully cool and lubricate, so that the machining is carried out at a relatively high temperature, greatly reducing the drill bit life and at the same time reducing the drilling quality. Therefore, the chip removal performance of the drill bit needs to be considered. Content of the Utility Model

[0003] In order to solve one or more of the above problems, the utility model provides a deep hole drill for drilling die steel.

[0004] According to one aspect of the utility model, the deep hole drill for drilling die steel includes a tool body, with a cutting head at one end and a tool shank formed at the other end. Its characteristics are as follows: The cutting head includes an intermediate core, and a plurality of cutting edges and chip removal grooves;

[0005] The intermediate core is successively a cylindrical first core, an inverted conical transition core, and a cylindrical second core from bottom to top. The diameter of the first core is greater than that of the second core, so that the lower cutting section has better rigidity;

[0006] The cutting edges of the plurality of cutting edges are circumferentially arrayed with respect to the intermediate core and integrally connected to the outer peripheral wall of the intermediate core, so that the cutting head forms a lower cutting section, a transition section, and an upper clearance section from bottom to top;

[0007] The plurality of chip removal grooves arranged in a circumferential array are formed by the cutting edges of the plurality of cutting edges and the intermediate core surrounding each other. The width of the first chip removal groove in the lower cutting section is smaller than the width of the second chip removal groove in the upper clearance section, so that the upper clearance section has a larger chip guiding and chip containing space;

[0008] The back of the tool and the chip flutes both extend helically along the axis of the middle core body.

[0009] In some embodiments, the diameter of the first core body of the lower cutting section is 40% ± 3% of the cutting diameter of the tool body;

[0010] The diameter of the second core body of the upper clearance section is 35% ± 3% of the cutting diameter of the tool body.

[0011] In some embodiments, the length of the lower cutting section is 10 mm - 12 mm.

[0012] In some embodiments, the lower end diameter of the transition core body of the transition section is equal to the diameter of the first core body and the lower end diameter is equal to the diameter of the second core body, and the length of the transition core body is 4 mm - 6 mm.

[0013] In some embodiments, the cutting edge shape of the front end face of the cutting edge lobe is a straight cutting edge.

[0014] In some embodiments, the cutting edge of the cutting edge lobe is chamfered by a chamfering plane.

[0015] In some embodiments, the angle of the chamfering plane is 25° ± 5°.

[0016] In some embodiments, the cutting edge lobe and the chip flutes are symmetric about the center of the cross-section of the tool body.

[0017] In some embodiments, the tool body further includes an inverted conical transition section with a taper of 30°;

[0018] Or the diameter of the lower cutting section is greater than the diameter of the upper clearance section.

[0019] In some embodiments, two internal cooling holes are further provided in the tool body. The internal cooling holes extend helically along the axial direction of the tool body and penetrate through the tool shank and the tool tip at both ends, and their helical arrangement is consistent with the direction of the cutting edge lobe;

[0020] Or the tool body is made of cemented carbide of ISO grade K20 - 30.

[0021] The deep hole drill for die steel drilling optimizes the thickness of the middle core, ensuring high strength at the lower cutting end of drilling. Meanwhile, the chip removal groove in the upper clearance section has a larger chip guiding and chip containing space, facilitating rapid chip removal. Its beneficial effects are as follows: First, this design improves the overall rigidity of the deep hole drill, has greater self-strength, greatly meets the strength requirements for deep hole drilling chips, reduces the probability of the drill bit breaking in the hole, improves the service life and durability of the drill tool, effectively saves costs, reduces the workpiece rejection rate, and has good economic and social benefits. At the same time, it improves the safety of processing. Second, this design optimizes the chip removal scheme, improves the speed of timely and rapid chip removal, makes the cutting process stable, reduces cutting deformation, improves the surface quality of the drilled hole, and at the same time makes the cutting fluid easily reach the bottom of the hole and the drill tip, fully cooling and lubricating, enabling the processing to be carried out at a suitable temperature, effectively improving the drill bit life and the quality of the drilled hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The front view schematic diagram of a deep hole drill for die steel drilling according to an embodiment of the present invention;

[0023] Figure 2 is Figure 1 The partial enlarged schematic diagram of the deep hole drill for die steel drilling shown;

[0024] Figure 3 is Figure 1 The bottom view schematic diagram of the deep hole drill for die steel drilling shown;

[0025] Figure 4 is Figure 3 The front view schematic diagram of the middle core shown;

[0026] Figure 5 is Figure 3 The bottom view schematic diagram of the cutting edge shown;

[0027] Figure 6 is Figure 1 The bottom view schematic diagram of the lower cutting section shown;

[0028] Figure 7 is Figure 1 The bottom view schematic diagram of the upper clearance section shown;

[0029] Tool body 01,

[0030] Tool head 1, middle core 10, first core 101, transition core 102, second core 103, cutting edge lobe 11, tool back 110, cutting edge 111, chamfered plane 112, chip removal groove 12, first chip removal groove 121, second chip removal groove 122, lower cutting section 13, upper clearance section 14, transition section 15;

[0031] Tool shank 2,

[0032] Inner cooling hole 3. Specific implementation manner

[0033] The present utility model will be further described in detail below with reference to the accompanying drawings. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0034] Figures 1 to 7 Schematically shows a deep hole drill for drilling die steel according to an embodiment of the present utility model. As shown in the figure, the deep hole drill for drilling die steel includes a tool body 01. The tool body 01 is preferably a cylinder. One end of the tool body 01 is a cutting head 1 and the other end forms a tool shank 2. It is characterized in that: the cutting head 1 includes an intermediate core 10, a plurality of cutting edges 11 and chip flutes 12;

[0035] The intermediate core 10 is successively a cylindrical first core 101, an inverted conical transition core 102 and a cylindrical second core 103 from bottom to top. The diameter of the first core 101 is larger than that of the second core 103, so that the lower cutting section 13 has better rigidity. The diameter of the first core 101 of the lower cutting section 13 is preferably 40% ± 3% of the cutting diameter of the tool body 01; the diameter of the second core 103 of the upper clearance section 14 is preferably 35% ± 3% of the cutting diameter of the tool body 01. The lower end diameter of the transition core 102 of the transition section is equal to the diameter of the first core 101 and the lower end diameter is equal to the diameter of the second core 103.

[0036] The tool backs 110 of the plurality of cutting edges 11 are arranged in a circumferential array with respect to the intermediate core 10 and are integrally connected to the outer peripheral wall of the intermediate core 10, so that the cutting head 1 forms a lower cutting section 13, a transition section and an upper clearance section 14 from bottom to top;

[0037] The plurality of chip flutes 12 arranged in a circumferential array are formed by the tool backs 110 of the plurality of cutting edges 11 and the intermediate core 10 surrounding each other. The width of the first chip flute 121 of the lower cutting section 13 is smaller than the width of the second chip flute 122 of the upper clearance section 14, so that the upper clearance section 14 has a larger chip guiding and chip accommodating space;

[0038] The tool backs 110 and the chip flutes 12 both extend in a spiral shape along the axis of the intermediate core 10.

[0039] The cutting edges 11 and the chip flutes 12 are both preferably two, and the two cutting edges 11 and the two chip flutes 12 are symmetric about the center of the cross section of the tool body 01.

[0040] The deep hole drill for die steel drilling optimizes the thickness of the middle core 10, ensuring high strength at the lower cutting end of drilling. At the same time, the chip removal groove 122 in the upper clearance section 14 has a larger chip guiding and chip containing space, facilitating rapid chip removal. Its beneficial effects are as follows: First, this design improves the overall rigidity of the deep hole drill, has greater self-strength, greatly meets the strength requirements for deep hole drilling chips, reduces the probability of the drill bit breaking in the hole, improves the service life and durability of the drilling tool, effectively saves costs, and reduces the workpiece rejection rate, having good economic and social benefits. At the same time, it improves the safety of processing high-hard die steel materials. Second, this design optimizes the chip removal scheme, improves the speed of timely and rapid chip removal, makes the cutting process stable, reduces cutting deformation, improves the surface quality of the drilled hole, and at the same time makes the cutting fluid easily reach the bottom of the hole and the drill tip, fully cooling and lubricating, enabling the processing to be carried out at a suitable temperature, effectively improving the drill bit life and drilling quality.

[0041] In multiple groups of repeated tests, the processing object is: die steel materials, with a hardness of HRC52.

[0042] Installed in the same vertical machining center: spindle type BT50, water-soluble cutting fluid for cooling, and the cooling method is internal cooling.

[0043] The specific cutting parameters are as follows: the cutting speed for both is 37.6 m / min, the feed speed for both is 120 mm / min; the drilling depth is 70 mm for both.

[0044] The processing length of the deep hole drill of the present utility model is 5 m, while that of the traditional drill bit is 2.5 m.

[0045] Therefore, the deep hole drill of the present utility model is significantly higher than the traditional drill bit in terms of processing life and processing safety, and the economic and social benefits will be significantly improved.

[0046] Preferably, the length of the lower cutting section 13 is 10 mm - 12 mm. Preferably, the length of the transition core 102 is 4 mm - 6 mm. Its beneficial effect is: This length selection has good structural strength.

[0047] Furthermore, the cutting edge shape on the front end face of the cutting lip 11 is a straight cutting edge 111. Preferably, the cutting edge 111 of the cutting lip 11 is chamfered through a chamfered plane 112. The angle of the chamfered plane 112 is preferably 25° ± 5°. Its beneficial effect is: The straight cutting edge design and the chamfering treatment of the cutting edge plane make the cutting edge stronger, greatly ensuring the safety of processing high-hard die steel materials.

[0048] Furthermore, the diameter of the lower cutting section 13 is larger than the diameter of the upper clearance section 14; its beneficial effect is: This setting ensures the rigidity of the lower cutting section 13, and at the same time ensures that the upper clearance section 14 does not damage the hole wall features after processing, achieving good machining accuracy.

[0049] Preferably, the tool body 01 further includes a tapered transition section 15 with a taper of 30°. The beneficial effect is that this setting reduces the tool stress and improves the machining performance.

[0050] Furthermore, two internal cooling holes 3 are provided in the tool body 01. The internal cooling holes 3 extend helically along the axial direction of the tool body 01 and penetrate through the tool shank 2 and the tool tip 1 at both ends. The helical arrangement is consistent with the direction of the cutting edge lobe 11. The beneficial effect is that this setting easily allows the cutting fluid to enter the drilling position and the heat generation position, obtaining good cooling quality and ensuring the machining speed and cutting quality.

[0051] Preferably, the tool body 01 is made of cemented carbide of ISO grade K20-30. The beneficial effect is that the tool with this setting has good mechanical properties and can effectively machine parts such as die steel.

[0052] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A deep hole drill for drilling die steel, comprising a tool body (01), one end of the tool body (01) is provided with a tool tip (1) and the other end forms a tool shank (2), characterized in that: The cutting head (1) includes an intermediate core (10), a plurality of cutting blades (11), and chip grooves (12). The intermediate core (10) includes a cylindrical first core (101), an inverted conical transition core (102), and a cylindrical second core (103) from bottom to top. The diameter of the first core (101) is greater than that of the second core (103), so that the lower cutting section (13) has better rigidity. The backs (110) of a plurality of the cutting blades (11) are arranged in a circumferential array around the intermediate core (10) and are integrally connected to the outer peripheral wall of the intermediate core (10), so that the cutting head (1) forms a lower cutting section (13), a transition section, and an upper clearance section (14) from bottom to top. A plurality of the chip grooves (12) arranged in a circumferential array are formed by the backs (110) of a plurality of the cutting blades (11) and the intermediate core (10) surrounding each other. The width of the first chip groove (121) in the lower cutting section (13) is smaller than the width of the second chip groove (122) in the upper clearance section (14), so that the upper clearance section (14) has a larger chip guiding and chip containing space. The back (110) and the chip groove (12) both extend spirally along the axis of the intermediate core (10).

2. The deep hole drill for die steel drilling according to claim 1, wherein The diameter of the first core (101) of the lower cutting section (13) is 40% ± 3% of the cutting diameter of the tool body (01). The diameter of the second core (103) of the upper clearance section (14) is 35% ± 3% of the cutting diameter of the tool body (01).

3. The deep hole drill for die steel drilling according to claim 2, wherein, The length of the lower cutting section (13) is 10 mm - 12 mm.

4. The deep hole drill for die steel drilling according to claim 2, characterized in that, The diameter of the lower end of the transition core (102) of the transition section is equal to the diameter of the first core (101) and also equal to the diameter of the second core (103). The length of the transition core (102) is 4 mm - 6 mm.

5. A deep hole drill for die steel drilling according to claim 1, characterized in that, The edge shape of the front end face of the cutting blade (11) is a straight edge (111).

6. The deep hole drill for die steel drilling according to claim 5, characterized in that, The edge (111) of the cutting blade (11) is chamfered by a chamfering plane (112).

7. A deep hole drill for die steel drilling according to claim 6, characterized in that, The angle of the chamfering plane (112) is 25° ± 5°.

8. A deep hole drill for die steel drilling according to claim 1, characterized in that, The cutting blade (11) and the chip groove (12) are symmetric about the center of the cross-section of the tool body (01).

9. A deep hole drill for drilling die steel according to claim 1, characterized in that, The tool body (01) further includes an inverted conical transition section (15) with a taper of 30°. Or the diameter of the lower cutting section (13) is greater than the diameter of the upper clearance section (14).

10. A deep hole drill for drilling die steel according to claim 1, characterized in that, Two internal cooling holes (3) are further provided in the tool body (01). The internal cooling holes (3) extend spirally along the axis of the tool body (01) and penetrate through the tool shank (2) and the cutting head (1) at both ends, and their spiral arrangement is in the same direction as that of the cutting blade (11). Or the tool body (01) is made of cemented carbide of ISO grade K20 - 30.

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