Drilling device for processing automobile metal castings

Abstract

The application discloses a drilling device for automobile metal casting machining, which comprises a supporting frame, a lifting assembly is arranged on the supporting frame, the lifting assembly drives a supporting box to realize vertical feeding, and a rotating assembly outputs a torque to drive a rotating drum assembly to rotate; a drill rod assembly is assembled in the rotating drum assembly and relies on a square rod part and a square hole of a limiting head to transmit the torque and rotate; a plurality of elastic limiting parts are arranged in the rotating drum from bottom to top in a stacked mode, and a disc-shaped heat conduction ring is arranged between adjacent elastic limiting parts; the disc-shaped heat conduction ring can conduct the heat of the drill rod assembly and form multi-point radial limiting on a matching part; the elastic limiting part is provided with an annular groove and a long hole, the long hole serves as an airflow circulation channel, a rotating joint on a support is connected with an external cold air source, cooling airflow is distributed between each disc-shaped heat conduction ring to perform blowing and cooling, and the airflow is discharged from a circular cone hole after intercommunication through the long hole. The application considers segmented cooling and heat dissipation, multi-point limiting and elastic buffering functions, and improves the drilling quality of automobile metal castings.

Description

Technical Field

[0001] This application relates to the field of automotive metal casting processing technology, and more particularly to drilling apparatus for automotive metal casting processing. Background Technology

[0002] In the production of automotive metal castings, drilling is required. During drilling, the high-speed rotation of the drill rod continuously generates a large amount of heat. This heat accumulation can easily cause thermal deformation of the drill rod. Bending or radial displacement of the drill rod can directly lead to out-of-tolerance hole diameter and unqualified hole wall roughness in the casting. In severe cases, drill rod breakage may occur. Most existing drilling equipment relies solely on the drill bit for heat dissipation, lacking a segmented heat dissipation structure on the drill rod itself. At the same time, the drill rod lacks a multi-segment radial limiting and buffering structure. When the machining is affected by hard points in the casting or vibration interference, the drill rod is prone to radial deflection, making it difficult to guarantee drilling accuracy. Summary of the Invention

[0003] The main purpose of this application is to provide a drilling device for machining automotive metal castings, which aims to solve the technical problems of traditional drilling devices, such as the drill rod being prone to thermal deformation and radial deflection.

[0004] To achieve the above objectives, this application provides a drilling apparatus for machining automotive metal castings, comprising: a support frame; a lifting assembly mounted on the support frame; a support box driven by the lifting assembly to lift; a rotary drum assembly rotatably mounted on the support box; a rotating assembly driving the rotary drum assembly to rotate; a drill rod assembly, a portion of which is fitted inside the rotary drum assembly; multiple elastic limiting members, which are stacked sequentially from bottom to top and are all fitted inside the rotary drum assembly; and a heat-conducting limiting member fitted outside the drill rod assembly. When the rotating assembly drives the rotary drum assembly to rotate, the drill rod assembly rotates accordingly. Except for the lowest elastic limiting member, a heat-conducting limiting member is fitted between any two adjacent elastic limiting members. Another portion of the drill rod assembly is fitted between the lowest elastic limiting member and adjacent elastic limiting members.

[0005] Optionally, the drill pipe assembly includes: a mating part, which has a cylindrical structure and is located inside the rotary drum assembly; a drill pipe part, which is coaxially disposed at the bottom end of the mating part and extends out of the rotary drum assembly; a square rod part, which is disposed at the top center of the mating part and is mated inside the rotary drum assembly; and a disc-shaped part, which is sleeved on the outside of the mating part; wherein a heat-conducting limiting member is mated on the outside of the mating part, and the mating part passes through the elastic limiting member.

[0006] Optionally, the rotating drum assembly includes: a rotating drum, which is rotatably mounted on a support box; a limiting head, which is fitted onto the rotating drum, and a portion of the limiting head is fitted into the uppermost elastic limiting member; and a support plate, which is located inside the rotating drum, and has a frustum hole through it, which supports the lowermost elastic limiting member.

[0007] Optionally, the elastic limiting component includes: an elastic ring disposed inside the rotating cylinder; and an annular portion integrally formed outside the elastic ring and fitted inside the rotating cylinder; wherein the elastic ring is coaxially disposed outside the fitting portion, the inner diameter of the elastic ring is larger than the outer diameter of the fitting portion, and the elastic ring is adapted to the frustum hole; an annular groove is provided through the elastic ring, extending to the inner circle of the elastic ring; and multiple elongated holes are also provided through the elastic ring, the multiple elongated holes being evenly distributed along the circumference of the elastic ring axis and extending to the inner circle of the elastic ring.

[0008] Optionally, the disc-shaped portion fits between the lowest elastic ring and the adjacent elastic ring.

[0009] Optionally, the limiting head includes: a T-shaped post, which is detachably mounted on the top of the rotating cylinder; a connecting ring, which is mounted on the bottom of the T-shaped post; and a frustum-shaped post, which is mounted on the bottom of the connecting ring. The T-shaped post, connecting ring, and frustum-shaped post are all coaxial with the rotating cylinder. A square hole is provided through the T-shaped post, connecting to the interior of the connecting ring, and a square rod portion is fitted within the square hole. The large end of the frustum-shaped post is connected to the T-shaped post, and the frustum-shaped post is fitted within the uppermost elastic ring. A receiving hole is provided through the frustum-shaped post, which is coaxial with the frustum-shaped post, and the diameter of the receiving hole is larger than the outer diameter of the mating part.

[0010] Optionally, the heat-conducting limiting component includes a disc-shaped heat-conducting ring, which is sleeved and fitted on the outside of the mating part. The outer diameter of the disc-shaped heat-conducting ring is smaller than the inner diameter of the inner circle of the annular part, and the disc-shaped heat-conducting ring is used to fit inside the elastic ring.

[0011] Optionally, the drill pipe assembly further includes a connecting part and a vent hole, the vent hole penetrating the top of the mating part and the square rod part; the top of the square rod part is connected to the connecting part, the connecting part is connected to the venting assembly, the venting assembly is connected to an external air source and is used to introduce airflow into the vent hole; the mating part is provided with multiple vent groups, the multiple vent groups are evenly distributed along the axis of the mating part, the lowermost vent group corresponds to the disc-shaped part and the lowermost disc-shaped heat conduction ring; except for the lowermost disc-shaped heat conduction ring, each of the remaining two adjacent disc-shaped heat conduction rings corresponds to a vent group; wherein, the vent group consists of multiple exhaust holes, the multiple exhaust holes are evenly distributed around the circumference of the mating part axis, the exhaust holes penetrate the outer wall of the mating part and connect to the vent hole; the venting assembly includes a support, the support is set on a support box, a rotary joint is installed on the support, the rotating end of the rotary joint is connected to the connecting part, and the rotary joint is used to connect to an external air source.

[0012] Optionally, the rotating assembly includes: a drive shaft rotatably mounted on a support box; a rotary motor mounted on the support box, with its output shaft fixedly connected to the drive shaft; a drive gear fixedly sleeved on the outside of the drive shaft; and a driven gear fixedly sleeved on the outside of the rotating cylinder, with the drive gear meshing with the driven gear.

[0013] Optionally, the lifting assembly includes: a threaded block, which is fixedly connected to a support box; a lead screw, which is rotatably mounted on a support frame, passes through the threaded block, and is threadedly connected to the threaded block; a drive motor, which is mounted on the support frame, and its output shaft is fixedly connected to the lead screw; a slide rail, which is vertically mounted on the support frame; and a slider, which is fixedly connected to the threaded block and is mounted on the slide rail.

[0014] The beneficial effects that this application can achieve are as follows: the elastic limiting member is clamped between the elastic limiting members, and the elastic limiting member is sleeved and fitted on the outside of the drill rod assembly, forming multiple supports for the drill rod assembly, thereby implementing multi-point constraints on the drill rod assembly, improving the coaxiality of the high-speed rotation of the drill rod assembly, reducing radial runout, and improving the drilling accuracy of the casting. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the drilling device for machining automotive metal castings in an embodiment of this application.

[0017] Figure 2 This is a partial structural cross-sectional view of the drilling apparatus for machining automotive metal castings in an embodiment of this application.

[0018] Figure 3 for Figure 2 Enlarged schematic diagram of region A in the middle.

[0019] Figure 4 for Figure 2 Enlarged schematic diagram of region B in the middle.

[0020] Figure 5 This is a schematic diagram showing the arrangement of the elastic limiting members and the cooperation between the elastic limiting members and the drill pipe assembly in the embodiments of this application.

[0021] Figure 6 This is the intended meaning of the interaction between the elastic limiting member and the thermally conductive limiting member in the embodiments of this application.

[0022] Figure 7 This is a schematic diagram of the limiting head structure in an embodiment of this application.

[0023] Figure 8 This is a schematic diagram of the drill pipe assembly structure in an embodiment of this application.

[0024] Figure 9 This is a schematic diagram of the interaction between the rotating component and the rotating drum component in an embodiment of this application.

[0025] Reference numerals: 1. Support frame; 2. Lifting assembly; 21. Threaded block; 22. Lead screw; 23. Drive motor; 24. Slide rail; 25. Slider; 3. Support box; 4. Rotary drum assembly; 41. Rotating drum; 42. Limiting head; 421. T-shaped column; 422. Connecting ring; 423. Frustum column; 424. Square hole; 425. Receiving hole; 43. Support plate; 431. Frustum hole; 5. Rotating assembly; 51. Drive shaft; 52. Rotary motor 53. Driven gear; 54. Driven gear; 6. Drill rod assembly; 61. Mating part; 62. Drill rod part; 63. Square rod part; 64. Disc-shaped part; 65. Connecting part; 66. Air guide hole; 67. Air hole group; 671. Exhaust hole; 7. Elastic limiting component; 71. Elastic ring; 72. Circular part; 73. Annular groove; 74. Long strip hole; 8. Heat-conducting limiting component; 81. Disc-shaped heat-conducting ring; 9. Air guide assembly; 91. Support; 92. Rotary joint.

[0026] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0031] Example 1 Reference Figures 1-8 This embodiment provides a drilling device for machining automotive metal castings, including a support frame 1, a lifting assembly 2 arranged on the support frame 1, the lifting assembly 2 can drive the support box 3 to complete the overall vertical lifting; a rotatable drum assembly 4 is arranged on the support box 3, the drum assembly 4 is provided with rotation driving force by a rotating assembly 5; a part of the drill rod assembly 6 is arranged inside the drum assembly 4, and when the rotating assembly 5 drives the drum assembly 4 to rotate, the drill rod assembly 6 rotates synchronously with the drum assembly 4.

[0032] Multiple elastic limiting members 7 are stacked sequentially from bottom to top inside the rotary drum assembly 4, and a heat-conducting limiting member 8 is provided between any two adjacent elastic limiting members 7; a part of the drill pipe assembly 6 is located between the bottommost elastic limiting member 7 and the adjacent elastic limiting member 7.

[0033] The drill rod assembly 6 includes a cylindrical mating part 61, which is arranged inside the rotary drum assembly 4; a drill rod part 62 is coaxially arranged at the bottom end of the mating part 61, which extends downward out of the rotary drum assembly 4 for drilling; a square rod part 63 is arranged at the center of the top end of the mating part 61, which is arranged inside the rotary drum assembly 4, and the square rod part 63 has a square cross-section and its length (or width) is smaller than the outer diameter of the mating part 61; the drill rod assembly 6 also includes a disc-shaped part 64, which is sleeved on the outside of the mating part 61; a heat-conducting limiting member 8 is sleeved on the outside of the mating part 61, and the entire mating part 61 passes through multiple sets of elastic limiting members 7.

[0034] The rotating drum assembly 4 includes a rotating drum 41, a limiting head 42, and a support plate 43. The rotating drum 41 is rotatably mounted on the support box 3 via bearings. The limiting head 42 is detachably mounted on the upper end of the rotating drum 41, and a part of the limiting head 42 is fitted inside the uppermost elastic limiting member 7. The support plate 43 is fixedly installed inside the rotating drum 41, near the bottom end of the rotating drum 41. A frustum hole 431 is opened in the support plate 43. The frustum hole 431 supports and positions the lowermost set of elastic limiting members 7. The larger end of the frustum hole 431 faces upward and the smaller end faces downward.

[0035] The elastic limiting component 7 consists of an elastic ring 71 and an integrally formed annular portion 72 on the outer side. The annular portion 72 is attached to the wall of the rotating cylinder 41 to achieve radial positioning. The elastic ring 71 is coaxially sleeved on the outside of the mating portion 61. The inner diameter of the elastic ring 71 is larger than the outer diameter of the mating portion 61, so the inner circle of the elastic ring 71 will not directly contact the mating portion 61. The elastic ring 71 is provided with an annular groove 73 extending to the inner circle. At the same time, multiple elongated holes 74 are evenly distributed around the circumference along the axial direction. The elongated holes 74 also extend to the inner circle of the elastic ring 71. Multiple notches are evenly distributed on the annular portion 72. The notches and the annular groove 73 are used to reserve deformation space for the elastic ring 71 and improve the deformation capability of the elastic ring 71.

[0036] The limiting head 42 includes a T-shaped column 421, a connecting ring 422, and a frustum column 423, arranged sequentially from top to bottom, all three being coaxial and coaxial with the rotating cylinder 41. The T-shaped column 421, connecting ring 422, and frustum column 423 are integrally formed. The T-shaped column 421 is detachably mounted on the top of the rotating cylinder 41. Specifically, the T-shaped column 421 is fixed to the top of the rotating cylinder 41 by bolts. A sealing ring or other sealing element can be provided between the T-shaped column 421 and the top of the rotating cylinder 41. The bolts penetrate the T-shaped column 421 and the sealing element and are threadedly connected to the rotating cylinder 41. The bolts are evenly distributed around the circumference of the rotating cylinder 41. A sealing element is used to improve the sealing between the T-shaped post 421 and the rotating cylinder 41. A square hole 424 is opened in the center of the T-shaped post 421. The square rod part 63 cooperates with the square hole 424. The torque is transmitted by the cooperation between the square rod part 63 and the square hole 424, which drives the drill rod assembly 6 to rotate. The frustum post 423 cooperates with the uppermost elastic ring 71. A receiving hole 425 is coaxially provided on the frustum post 423. The diameter of the receiving hole 425 is larger than the outer diameter of the mating part 61, so as not to cause scratches or interference to the mating part 61. Of course, the inner diameter of the connecting ring 422 is also larger than the outer diameter of the mating part 61.

[0037] The heat-conducting limiting component 8 is a disc-shaped heat-conducting ring 81, which is sleeved on the outer wall of the mating part 61. The outer diameter of the disc-shaped heat-conducting ring 81 is smaller than the inner diameter of the inner circle of the annular part 72. The disc-shaped heat-conducting ring 81 is limited and clamped between two adjacent sets of elastic rings 71. The disc-shaped heat-conducting ring 81 can be made of beryllium copper alloy with high thermal conductivity. On the one hand, it can conduct the heat generated by the operation of the drill rod assembly 6 to the elastic limiting component 7 and the rotating cylinder 41, realizing heat dispersion and discharge. On the other hand, the inner ring of the disc-shaped heat-conducting ring 81 abuts against the outer wall of the mating part 61, and multiple sets of The disc-shaped heat-conducting rings 81 are arranged at intervals along the axial direction, forming multiple radial support and limiting points for the mating part 61. Since the disc-shaped heat-conducting rings 81 are clamped and fixed between adjacent elastic rings 71, and all the elastic limiting members 7 are stacked and limited inside the rotating cylinder 41, the disc-shaped heat-conducting rings 81 themselves are stable and will not move. Multiple points simultaneously provide radial constraint to the mating part 61, and the constraint points are distributed along the axial direction, effectively ensuring the straightness of the axis of the mating part 61, suppressing radial runout during the high-speed rotation of the drill rod assembly 6, and improving the drilling accuracy.

[0038] The elastic limiting member 7 is made of a material that combines elasticity, rigidity and heat resistance. It can be made of materials such as polyimide, which has elastic buffering capacity and is not easy to age and fail under high temperature conditions. The disc-shaped part 64 is clamped between the bottom elastic ring 71 and the adjacent elastic ring 71.

[0039] The drill pipe assembly 6 is also provided with a connecting part 65 and an air guide hole 66. The air guide hole 66 passes through the top end of the mating part 61 and the square rod part 63, and the bottom end of the air guide hole 66 connects to the connection between the mating part 61 and the drill pipe part 62. The center of the top end of the square rod part 63 is connected to the connecting part 65, and the connecting part 65 is connected to the air guide assembly 9. The entire drill pipe assembly 6 can adopt an integral molding structure. The air guide assembly 9 includes a support 91 fixed on the support box 3. A rotary joint 92 is installed on the support 91. The rotating end of the rotary joint 92 is connected to the connecting part 65. The end of the rotary joint 92 used for installation and fixing is installed on the support 91. The rotating end of the rotary joint 92 can rotate along the axis of the rotating cylinder 41. The rotary joint 92 is connected to an external air source, and the external air source adopts a cold air flow of appropriate pressure.

[0040] Multiple sets of air holes 67 are arranged at intervals along the axial direction on the mating part 61. Each air hole 67 consists of multiple circumferentially distributed exhaust holes 671 (specifically, they are evenly distributed along the circumference of the mating part 61). The exhaust holes 671 are connected to the air guide holes 66. The lowermost air hole group 67 is arranged between the dish-shaped part 64 and the lowermost dish-shaped heat conduction ring 81. Except for the lowermost dish-shaped heat conduction ring 81, a set of air holes 67 is arranged between any two adjacent dish-shaped heat conduction rings 81.

[0041] The automotive metal casting to be processed is clamped and fixed by existing external fixtures or tooling, which is existing technology and will not be described in detail here; during operation, the lifting assembly 2 drives the support box 3 to feed downward as a whole; the rotating assembly 5 outputs torque to drive the rotating drum assembly 4 to rotate, and through the square hole 424 of the limiting head 42, it cooperates with the square rod part 63 to drive the entire drill rod assembly 6 to rotate. After the drill rod part 62 contacts the casting, drilling is carried out.

[0042] When the end face of the drill rod 62 just contacts the surface of the metal casting to be processed, an instantaneous axial impact load is generated. This axial impact load is transmitted from the drill rod 62 to the mating part 61. The disc-shaped part 64 on the mating part 61 directly compresses the elastic rings 71 located on its upper and lower sides. The elastic rings 71 are provided with annular grooves 73, which are reserved for deformation allowance. The square rod part 63 mates with the square hole 424, and multiple sets of elastic limiting members 7 are stacked. Through the elastic deformation of the elastic limiting members 7, the instantaneous impact generated when the drill rod part 62 contacts the casting is absorbed, thereby achieving axial buffering and avoiding drill rod vibration and chipping caused by rigid hard collision. After the impact, when the elastic rings 71 reset, the back drive causes the drill rod assembly 6 to return to its original axial position.

[0043] During drilling, an external air source introduces a cold airflow at a suitable pressure through the air guide hole 66 via the rotary joint 92. By introducing a suitable airflow at a low pressure, the airflow does not disrupt the high-speed rotational stability of the drill rod assembly 6. The cold airflow flows downward along the air guide hole 66 and is ejected outward through the exhaust holes 671 of each air hole group 67. The airflow discharged from the exhaust holes 671 enters the space between the disc-shaped part 64 and the bottom disc-shaped heat conduction ring 81, as well as between each pair of adjacent disc-shaped heat conduction rings 81, to directly purge and cool the disc-shaped heat conduction rings 81, carrying away the heat conducted in.

[0044] The inner diameter of the elastic ring 71 is larger than the outer diameter of the mating part 61, and the elastic ring 71 itself does not contact the mating part 61; the disc-shaped part 64 and the disc-shaped heat-conducting ring 81 will only partially block the elongated hole 74, and will not completely seal the elongated hole 74. Therefore, the cavities formed by the adjacent elastic rings 71 and the middle disc-shaped heat-conducting ring 81 can be interconnected through the elongated hole 74. The airflow ejected from the exhaust holes 671 at each position will flow into the elongated hole 74 at the corresponding position, and will eventually converge and flow into the elongated hole 74 of the bottom elastic ring 71, and finally be discharged downward through the small end of the frustum hole 431 of the support plate 43, thus completing the airflow discharge.

[0045] During the drilling process, when the drill rod part 62 contacts the surface of the casting and is subjected to impact and vibration loads, the load is transmitted to the drill rod assembly 6. Since the drill rod assembly 6 is a rod-shaped structure, only the square rod part 63 fits inside the square hole 424. During the drilling process of the drill rod assembly 6, if the drill rod part 62 and the mating part 61 undergo radial deflection, the radial displacement will compress the corresponding disc-shaped heat-conducting ring 81. The disc-shaped heat-conducting ring 81 further transmits the force to the elastic limiting members 7 on the upper and lower sides. The elastic limiting members 7 undergo elastic deformation to buffer and absorb the radial deflection impact of the drill rod assembly 6. Relying on the segmented elastic buffering of the multi-segment elastic limiting members 7, the drill rod vibration is suppressed, ensuring the stability of the high-speed rotation process of the drill rod assembly 6, reducing the hole diameter deviation, and ensuring the drilling quality of automotive metal castings.

[0046] Example 2 Reference Figure 1 , Figure 2 as well as Figure 9 Based on Embodiment 1, the rotating assembly 5 includes a drive shaft 51 and a rotary motor 52. The rotary motor 52 is fixedly mounted on the support box 3, and the output shaft of the rotary motor 52 is fixedly connected to the drive shaft 51. The output shaft of the rotary motor 52 and the drive shaft 51 are coaxial. The drive shaft 51 is rotatably mounted on the support box 3 through bearings. The drive gear 53 is fixedly sleeved on the outside of the drive shaft 51, and the driven gear 54 is fixedly sleeved on the outside of the rotating cylinder 41. The drive gear 53 and the driven gear 54 mesh with each other.

[0047] During operation, the rotary motor 52 drives the drive shaft 51 to rotate. The drive gear 53 and the driven gear 54 mesh together, thereby driving the rotary cylinder 41 to rotate as a whole. The rotary cylinder 41 drives the internally stacked elastic limiting parts 7, disc-shaped heat conducting rings 81 and limiting heads 42 to rotate synchronously. Then, through the torque transmission between the square hole 424 and the square rod part 63, the entire drill rod assembly 6 is driven to rotate.

[0048] Example 3 Refer again Figure 1 , Figure 2 Based on Embodiment 2, the lifting assembly 2 includes a threaded block 21, a lead screw 22, and a drive motor 23. The drive motor 23 is mounted on the support frame 1, and the output shaft of the drive motor 23 is connected to the lead screw 22. The lead screw 22 is rotatably mounted on the support frame 1 through a bearing. The threaded block 21 is fixedly connected to the support box 3, and the lead screw 22 passes through the threaded block 21 and is threadedly connected to the threaded block 21. A slide rail 24 is vertically fixed on the support frame 1, and a slider 25 is fitted on the slide rail 24. The slider 25 is fixedly connected to the threaded block 21.

[0049] The drive motor 23 drives the lead screw 22 to rotate forward or reverse. Since the slider 25 is fitted on the slide rail 24, the lead screw 22 can drive the threaded block 21 to move linearly in the vertical direction. The threaded block 21 is fixedly connected to the support box 3, thereby driving the support box 3 to move linearly in the vertical direction, realizing the movement of the drill rod assembly 6 and the rotating cylinder 41, and thus realizing the downward feeding or reset of the drill rod part 62.

[0050] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A drilling device for machining automotive metal castings, characterized in that, include: Support frame; The lifting assembly is mounted on the support frame. The support box is raised and lowered by a lifting assembly. Rotary drum assembly, which is rotatably mounted on a support box; Rotating component, which drives the rotating drum assembly to rotate; Drill pipe assembly, a portion of which is fitted inside the rotary drum assembly; The elastic limiting component has multiple elastic limiting components, which are stacked sequentially from bottom to top, and all of the elastic limiting components are fitted inside the rotating drum assembly. A heat-conducting limiting component is fitted onto the outside of the drill pipe assembly; When the rotating component drives the drum assembly to rotate, the drill pipe assembly rotates along with the drum assembly. Except for the bottom elastic limiting member, there is a heat-conducting limiting member between any two adjacent elastic limiting members; Another part of the drill pipe assembly is fitted between the lowest elastic limiter and the adjacent elastic limiters.

2. The drilling device for machining automotive metal castings as described in claim 1, characterized in that, The drill pipe assembly includes: The mating part has a cylindrical structure and is located inside the rotating drum assembly; The drill rod section is coaxially disposed at the bottom end of the mating part, and the drill rod section extends out of the rotary drum assembly; The square rod portion is located at the top center of the mating part, and the square rod portion is mated inside the rotating drum assembly; The disc-shaped part is fitted onto the outside of the mating part; The heat-conducting limiting component is disposed outside the mating part, and the mating part passes through the elastic limiting component.

3. The drilling device for machining automotive metal castings as described in claim 2, characterized in that, The rotary drum assembly includes: A rotating cylinder is mounted on a support box. The limiting head is fitted onto the rotating cylinder, and a portion of the limiting head is fitted into the uppermost elastic limiting member. The support plate is located inside the rotating cylinder, and a frustum hole is provided through the support plate, which supports the lowest elastic limiting member.

4. The drilling device for machining automotive metal castings as described in claim 3, characterized in that, The elastic limiting components include: An elastic ring is located inside the rotating cylinder. The annular part is integrally formed and set outside the elastic ring, and the annular part is fitted inside the rotating cylinder; wherein, the elastic ring is coaxially set outside the fitting part, the inner diameter of the elastic ring is larger than the outer diameter of the fitting part, and the elastic ring is adapted to the frustum hole. An annular groove is provided through the elastic ring, extending to the inner circle of the elastic ring; multiple elongated holes are also provided through the elastic ring, which are evenly distributed around the circumference of the elastic ring axis and extend to the inner circle of the elastic ring.

5. The drilling apparatus for machining automotive metal castings as described in claim 4, characterized in that, The disc-shaped part fits between the bottom elastic ring and the adjacent elastic ring.

6. The drilling apparatus for machining automotive metal castings as described in claim 4, characterized in that, Limit heads include: The T-shaped column is detachably mounted on the top of the rotating cylinder; Connecting ring, the connecting ring is set at the bottom end of the T-shaped column; A frustum column, which is located at the bottom of the connecting ring; Among them, the T-shaped column, connecting ring, and frustum column are all coaxial with the rotating cylinder; A square hole is provided through the T-shaped column, which connects to the inside of the connecting ring, and the square rod is fitted into the square hole. The large end of the frustum column is connected to the T-shaped column. The frustum column is fitted inside the uppermost elastic ring. A receiving hole is provided through the frustum column. The receiving hole is coaxial with the frustum column, and the diameter of the receiving hole is larger than the outer diameter of the mating part.

7. The drilling apparatus for machining automotive metal castings as described in claim 4, characterized in that, The thermally conductive limiting component includes a disc-shaped thermally conductive ring, which is sleeved on the outside of the mating part. The outer diameter of the disc-shaped thermally conductive ring is smaller than the inner diameter of the inner circle of the annular part, and the disc-shaped thermally conductive ring is used to fit inside the elastic ring.

8. The drilling apparatus for machining automotive metal castings as described in claim 4, characterized in that, The drill pipe assembly also includes a connecting part and a vent hole, which extends through the top of the mating part and the square rod part; The top of the square rod is connected to a connecting part, which is connected to an air guiding component. The air guiding component is connected to an external air source and is used to introduce airflow into the air guiding hole. Multiple sets of air holes are provided on the mating part. The multiple sets of air holes are evenly distributed along the axis of the mating part. The lowest set of air holes corresponds to the area between the dish-shaped part and the lowest dish-shaped heat-conducting ring. Except for the lowest dish-shaped heat-conducting ring, each of the remaining two adjacent dish-shaped heat-conducting rings corresponds to one set of air holes. The vent group consists of multiple vent holes, which are evenly distributed around the circumference of the mating part axis. The vent holes penetrate the outer wall of the mating part and are connected to the air guide hole. The air guiding assembly includes a support, which is mounted on a support box. A rotary joint is installed on the support, and the rotating end of the rotary joint is connected to a connecting part. The rotary joint is used to connect to an external air source.

9. The drilling apparatus for machining automotive metal castings as described in claim 3, characterized in that, The rotating assembly includes: The drive shaft is rotatably mounted on the support box. A rotary motor is mounted on a support box, and the output shaft of the rotary motor is fixedly connected to the drive shaft. The drive gear is fixedly sleeved on the outside of the drive shaft; The driven gear is fixedly sleeved on the outside of the rotating cylinder, and the driving gear meshes with the driven gear.

10. The drilling apparatus for machining automotive metal castings as described in claim 3, characterized in that, The lifting assembly includes: Threaded blocks, threaded blocks are fixedly connected to the support box; The lead screw is rotatably mounted on the support frame, passes through the threaded block, and is threadedly connected to the threaded block. The drive motor is mounted on the support frame, and the output shaft of the drive motor is fixedly connected to the lead screw. The slide rail is vertically mounted on the support frame. The slider is fixedly connected to the threaded block, and the slider is fitted onto the slide rail.

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