A punching device for nodular cast iron castings

Abstract

The utility model discloses a nunchakos for nodular cast iron casting is used punching device, including transmission box, driving motor, coolant delivery pipe and the gear transmission mechanism of setting in transmission box. Transmission box lower part is supported with a driven shaft through the retaining column, and the driven shaft lower extreme is equipped with the drilling milling cutter. The improvement lies in: the driven shaft is with the coaxial water delivery channel of drilling milling cutter inside and is set up, and the water delivery channel upper end is connected with the lower end of coolant delivery pipe through a swivel joint, the water outlet hole that is communicated with internal water delivery channel is seted up in the chip flute of drilling milling cutter. Still be provided with the filter tube of filter screen on the coolant delivery pipeline. The utility model discloses through the water delivery channel of built -in accurate delivery coolant to drill cutting area, has realized high -efficient cooling and lubrication, and utilizes the forced ejection of cooling liquid to chip, effectively solved the technical problem such as drill overheating, wear and tear fast and the unsmooth chip of nodular cast iron drilling process.

Description

Technical Field

[0001] This utility model relates to the field of ductile iron casting processing technology, specifically a drilling device for ductile iron castings. Background Technology

[0002] Ductile iron, due to its high strength, good toughness, and excellent casting properties, is widely used in the manufacture of various mechanical parts, such as crankshafts, gears, and housings. Drilling is a common and crucial process in the subsequent machining of these castings.

[0003] Currently, drilling operations on ductile iron castings typically employ general-purpose vertical drilling machines or machining centers with twist drills or carbide drill bits. However, ductile iron itself has high hardness and wear resistance, presenting several significant problems during drilling: First, a large amount of cutting heat is generated at the drill bit-workpiece contact area. Due to the relatively poor thermal conductivity of cast iron, heat easily accumulates at the drill bit's cutting edge, causing a rapid rise in drill bit temperature, thus accelerating wear and shortening its service life. Second, high temperatures may cause annealing of the drill bit material, reducing its hardness and even leading to drill bit chipping or breakage. Third, high temperatures and poor chip removal can affect the surface quality of the machined hole wall, potentially resulting in roughness, the formation of a hardened layer, or even microcracks, impacting the part's performance. Furthermore, traditional cooling methods often rely on externally poured coolant. This method struggles to effectively penetrate the core area where the drill bit tip contacts the chips, resulting in limited cooling and lubrication effects, and its auxiliary role in chip removal during deep hole machining is also relatively insufficient.

[0004] Therefore, we propose a drilling device for ductile iron castings. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a drilling device for ductile iron castings. By integrating internal cooling, forced chip removal, and filtration structures, it effectively solves the problems of overheating and chip removal during drilling of ductile iron, improves drill bit life, processing quality, and operating efficiency, and can effectively solve the problems in the background technology.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a drilling device for ductile iron castings, comprising a transmission housing, a connecting bracket fixedly installed on the back of the transmission housing, a drive motor fixedly installed on the right end of the upper outer surface of the transmission housing, a coolant delivery pipe fixedly installed on the left end of the upper outer surface of the transmission housing, and one end of the coolant delivery pipe extending into the upper left side of the inner cavity of the transmission housing; the transmission housing is internally provided with a driven shaft, a drive shaft, a second gear, and a first gear; the lower end of the driven shaft extends through to the left side of the lower outer surface of the transmission housing; and the lower outer surface of the transmission housing... A retaining post is fixedly installed on the left side of the driven shaft. The lower end of the driven shaft passes through the retaining post. A drilling cutter is fixedly installed on the outer surface of the lower end of the driven shaft. A water supply channel is provided between the driven shaft and the drilling cutter, and the water supply channel extends to the outer surface of the upper end of the driven shaft. A chip removal groove is provided on the outer wall of the drilling cutter. A water outlet is provided in the chip removal groove. The water outlet communicates with the water supply channel inside the drilling cutter. A filter pipe and a rotary joint are connected in sequence to the lower end of the coolant delivery pipe. The lower end of the rotary joint is connected to the upper end of the water supply channel. A filter screen is fixedly installed inside the filter pipe.

[0009] Preferably, the lower end of the rotary joint is fixed to the upper end of the water conveyance channel.

[0010] Preferably, a sealed bearing is provided between the driven shaft and the retaining column and the transmission housing, and the driven shaft is rotatably connected to the retaining column and the transmission housing through the sealed bearing.

[0011] Preferably, a sealed bearing is provided between the drive shaft and the transmission housing, and the drive shaft is rotatably connected to the transmission housing through the sealed bearing.

[0012] Preferably, a coupling is provided between the drive shaft and the drive motor, and the upper outer surface of the drive shaft is fixedly connected to the lower outer surface of the output shaft of the drive motor through the coupling.

[0013] Preferably, the second gear is fixed to the outer wall of the middle part of the drive shaft, the first gear is fixed to the outer wall of the upper part of the driven shaft, the second gear is located on one side of the first gear, and the second gear meshes with the first gear.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a drilling device for ductile iron castings, which has the following advantages:

[0016] 1. This drilling device for ductile iron castings establishes a highly efficient internal cooling system by creating water channels inside the driven shaft and the drilling cutter, connecting them to the water outlet in the chip removal groove of the cutter. Coolant (such as cutting oil or a special cutting fluid) is directly delivered to the high-speed rotating tip of the drilling cutter via a coolant delivery pipe and rotary joint. This targeted cooling method directly and effectively cools and lubricates the cutting area where the drill bit contacts the workpiece, effectively overcoming the drawback of traditional externally sprayed coolant which struggles to penetrate the cutting edge. It reduces the concentrated heat generated during drilling due to the high hardness of ductile iron, effectively preventing annealing, wear, and chipping of the drill bit caused by high temperatures, thus extending the service life of the drilling cutter. Simultaneously, good cooling and lubrication help improve the machining quality of the hole wall, making its surface smoother and preventing burns and micro-cracks.

[0017] 2. This drilling device for ductile iron castings features a coolant sprayed from the water outlet at the tip of the drill bit. This not only provides cooling but also forces and smoothly flushes out the fine chips generated during the cutting process from the chip removal groove. The integrated design of "cooling + chip removal" is particularly suitable for the chips generated during the machining of ductile iron, effectively avoiding the risk of chip blockage caused by poor chip removal, as well as the risk of the drill bit getting stuck or broken. This ensures the continuity and stability of the drilling process and improves machining efficiency and yield.

[0018] 3. The drilling device for ductile iron castings has a filter pipe with a built-in filter screen installed at the lower end of the coolant delivery pipe; this can effectively filter impurities that may be contained in the coolant or tiny metal particles generated during processing, preventing them from entering the small water delivery channels and outlet holes, avoiding blockage of the cooling channels, and reducing equipment maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a drilling device for ductile iron castings according to the present invention.

[0020] Figure 2 This is a partial structural schematic diagram of a drilling device for ductile iron castings according to the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the coolant delivery pipe, filter pipe and rotary joint in the drilling device for ductile iron castings of this utility model.

[0022] Figure 4 This is a side cross-sectional view of the filter tube in a drilling device for ductile iron castings according to this utility model.

[0023] In the diagram: 1. Transmission housing; 2. Connecting bracket; 3. Drive motor; 4. Coolant delivery pipe; 5. Holding column; 6. Driven shaft; 7. Drilling and milling cutter; 8. Chip removal groove; 9. Water outlet; 10. First gear; 11. Water delivery channel; 12. Drive shaft; 13. Second gear; 14. Filter pipe; 15. Rotary joint; 16. Filter screen. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] like Figure 1-4 As shown, this utility model provides a technical solution: a drilling device for ductile iron castings.

[0026] The transmission housing 1 serves as the main support and transmission structure, with a connecting bracket 2 fixedly mounted on its back. This connecting bracket 2 is used to connect the entire device to a lifting drive mechanism such as a hydraulic cylinder or a servo electric cylinder to achieve the feed motion for drilling operations. A drive motor 3 is fixedly mounted on the right end of the upper outer surface of the transmission housing 1, and a coolant delivery pipe 4 is fixedly mounted on the left end of the upper outer surface of the transmission housing 1. One end of the coolant delivery pipe 4 extends into the upper left side of the inner cavity of the transmission housing 1 to introduce coolant.

[0027] The transmission housing 1 houses a driven shaft 6, a drive shaft 12, a second gear 13, and a first gear 10. The drive shaft 12 is rotatably connected to the transmission housing 1 via a sealed bearing. The upper outer surface of the drive shaft 12 is fixedly connected to the lower outer surface of the output shaft of the drive motor 3 via a coupling, allowing the drive motor 3 to directly drive the drive shaft 12 to rotate. The second gear 13 is fixedly mounted on the outer wall of the middle section of the drive shaft 12, and the first gear 10 is fixedly mounted on the upper outer wall of the driven shaft 6. The second gear 13 is located to one side of the first gear 10, and the second gear 13 meshes with the first gear 10. Therefore, when the drive motor 3 starts, power is transmitted sequentially through the drive shaft 12, the second gear 13, and the first gear 10 to the driven shaft 6, achieving deceleration or acceleration and changing the direction of motion.

[0028] The lower end of the driven shaft 6 passes through the transmission housing 1 and extends to the left side of its lower outer surface. A retaining post 5 is fixedly installed on the left side of the lower outer surface of the transmission housing 1, and the lower end of the driven shaft 6 also passes through the retaining post 5. Sealed bearings are provided between the driven shaft 6, the retaining post 5, and the transmission housing 1, so that the driven shaft 6 can rotate stably and smoothly and effectively seal the internal space. A drilling and milling cutter 7 is fixedly installed on the lower outer surface of the driven shaft 6 for drilling the ductile iron casting.

[0029] To achieve internal cooling, a water supply channel 11 is provided at the central axis of both the driven shaft 6 and the drill end mill 7, extending to the upper outer surface of the driven shaft 6. The outer wall of the drill end mill 7 is provided with a chip removal groove 8 to remove chips generated during the cutting process. Multiple water outlet holes 9 are provided in the chip removal groove 8, and these holes communicate with the water supply channel 11 inside the drill end mill 7.

[0030] The lower end of the coolant delivery pipe 4 is sequentially connected to a filter pipe 14 and a rotary joint 15. Specifically, a filter screen 16 is fixedly installed inside the filter pipe 14 to filter impurities and metal particles that may be present in the coolant, preventing them from clogging subsequent narrow channels. The lower end of the rotary joint 15 is fixed to the upper inlet of the water delivery channel 11 via a sealing connector. The rotary joint 15 is a standard component that allows pressurized fluid to be delivered from a stationary pipe to a rotating shaft without leakage, thus ensuring a continuous and stable supply of coolant even when the driven shaft 6 and the drill cutter 7 are rotating at high speed.

[0031] Working principle:

[0032] When using this device to drill holes in ductile iron castings, first install the device onto the lifting mechanism of a CNC machine tool or special drilling machine via the connecting bracket 2. Start the drive motor 3, and power is transmitted through the drive shaft 12, the second gear 13, and the first gear 10, driving the driven shaft 6 and the drilling cutter 7 at its end to rotate at high speed. At the same time, an external liquid supply system (such as a coolant pump) pumps coolant into the coolant delivery pipe 4. The coolant first flows through the filter pipe 14, where the filter screen 16 intercepts any impurities. Subsequently, the clean coolant enters the water channel 11 in the center of the driven shaft 6 through the rotary joint 15, and finally sprays out from the water outlet 9 on the chip removal groove 8 of the drilling cutter 7.

[0033] The sprayed coolant acts directly on the cutting contact area between the drill bit and the workpiece, achieving efficient cooling and lubrication, reducing cutting temperature, protecting the drill bit, and extending its service life. Simultaneously, the high-speed flow of coolant forces the chips generated during cutting out of the chip removal groove 8, ensuring smooth chip removal and preventing chip blockage and entanglement of the drill bit. This ensures a continuous and stable drilling process, improving the quality and efficiency of the machined hole.

[0034] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A drilling device for ductile iron castings, comprising a transmission housing (1), characterized in that: A connecting bracket (2) is fixedly installed on the back of the transmission housing (1). A drive motor (3) is fixedly installed on the right end of the upper outer surface of the transmission housing (1). A coolant delivery pipe (4) is fixedly installed on the left end of the upper outer surface of the transmission housing (1), and one end of the coolant delivery pipe (4) extends into the upper left side of the inner cavity of the transmission housing (1). The transmission housing (1) is equipped with a driven shaft (6), a drive shaft (12), a second gear (13), and a first gear (10). The lower end of the driven shaft (6) extends through to the left side of the lower outer surface of the transmission housing (1). A retaining column (5) is fixedly installed on the left side of the lower outer surface of the transmission housing (1). The lower end of the driven shaft (6) extends through the retaining column (5). A drilling cutter (7) is fixedly installed on the lower outer surface of the driven shaft (6). A water supply channel (11) is provided between the driven shaft (6) and the drilling cutter (7), and the water supply channel (11) extends to the upper outer surface of the driven shaft (6). A chip removal groove (8) is provided on the outer wall of the drilling cutter (7). A water outlet (9) is provided in the chip removal groove (8). The water outlet (9) is connected to the water supply channel (11) inside the drilling cutter (7). A filter pipe (14) and a rotary joint (15) are connected in sequence at the lower end of the coolant delivery pipe (4). The lower end of the rotary joint (15) is connected to the upper end of the water supply channel (11). A filter screen (16) is fixedly installed inside the filter pipe (14).

2. The drilling device for ductile iron castings according to claim 1, characterized in that: The lower end of the rotary joint (15) is fixed to the upper end of the water conveyance channel (11).

3. The drilling device for ductile iron castings according to claim 1, characterized in that: Sealed bearings are provided between the driven shaft (6), the retaining column (5), and the transmission housing (1). The driven shaft (6) is rotatably connected to the retaining column (5) and the transmission housing (1) through the sealed bearings.

4. The drilling device for ductile iron castings according to claim 1, characterized in that: A sealed bearing is provided between the drive shaft (12) and the transmission housing (1), and the drive shaft (12) is rotatably connected to the transmission housing (1) through the sealed bearing.

5. A drilling device for ductile iron castings according to claim 1, characterized in that: A coupling is provided between the drive shaft (12) and the drive motor (3), and the upper outer surface of the drive shaft (12) is fixedly connected to the lower outer surface of the output shaft of the drive motor (3) through the coupling.

6. The drilling device for ductile iron castings according to claim 1, characterized in that: The second gear (13) is fixed on the outer wall of the middle part of the drive shaft (12), the first gear (10) is fixed on the outer wall of the upper part of the driven shaft (6), the second gear (13) is located on one side of the first gear (10), and the second gear (13) meshes with the first gear (10).

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