Water-cooled drilling device for water pump casting production

Abstract

The application discloses a water-cooled drilling device for water pump casting production and belongs to the technical field of drilling machines, and aims to solve the problems of low machining efficiency, non-adjustable hole diameter and separated drilling and tapping processes of the existing water pump casting drilling equipment. The device mainly comprises a base, a multi-shaft device, an index plate, a driving part, a plurality of tool holders, an adjusting assembly and a switching assembly. The multi-shaft device divides single-path power into a plurality of output shafts through spiral gear transmission. Each tool holder is driven to rotate through a spline telescopic rod with a universal joint. The adjusting assembly synchronously adjusts the machining pitch circle diameter of all tool holders through the linkage structure of a fixed ring, an adjusting disc and a sliding block. The switching assembly in the tool holder realizes the switching of the drilling head and the tapping head through the ratchet pawl reversing and spline rod telescopic mechanism. The tool integrated water cooling interface realizes machining cooling. The device can realize synchronous multi-hole machining, is suitable for multiple specifications of castings, completes the drilling and tapping processes at a time, and greatly improves the machining efficiency and universality.

Description

Technical Field

[0001] This invention relates to the field of drilling machine tool technology, and in particular to a water-cooled drilling device for the production of water pump castings. Background Technology

[0002] As the core load-bearing casting of water pump products, the water pump housing requires a large number of assembly holes and connection holes to be machined on its end face and pipe interface. The holes are usually distributed in the installation area around the outer circle of the housing and the pipe connection area near the center. Most of the holes need to be drilled and tapped in sequence. The processing efficiency and processing accuracy of the drilling process directly determine the production capacity of the water pump casting.

[0003] Traditional drilling of water pump casings often uses single-axis drilling machines. During operation, the workpiece needs to be rotated or repeatedly moved and clamped to process each hole. The process is highly repetitive, and only one hole can be processed in a single clamping, resulting in low production efficiency.

[0004] Existing technologies also include some multi-axis drilling equipment that can simultaneously complete drilling operations at multiple holes, improving processing efficiency to some extent. However, the installation positions of the drill spindles of this type of equipment are mostly fixed, and the processing distribution diameter of each tool holder cannot be adjusted synchronously. It can only be adapted to the processing of a single specification of water pump castings and is a special customized equipment. When the model and specifications of the water pump housing change or the diameter of the hole distribution changes, the equipment cannot be quickly adjusted to adapt, resulting in extremely poor versatility. If manufacturers want to cover the processing of multiple specifications of products, they need to configure multiple special drilling equipment with different parameters, resulting in high equipment procurement and site occupation costs. Summary of the Invention

[0005] One objective of this invention is to provide a water-cooled drilling device for the production of water pump castings. This invention solves the problems of low processing efficiency, poor versatility due to the inability to synchronously adjust the diameter distribution of holes, and high equipment cost due to the separation of drilling and tapping processes in existing water pump casting drilling equipment.

[0006] A water-cooled drilling device for producing water pump castings according to an embodiment of the present invention includes a base, a multi-spindle assembly for power transmission, and multiple tool holders for mounting drill bits. A dividing plate is fixedly mounted on the bottom of the multi-spindle assembly. Multiple driving components connected to the output shaft of the multi-spindle assembly are disposed within the dividing plate for power transmission. The multiple tool holders are arranged in a circular array on the bottom of the dividing plate. Drill bits and tapping heads are symmetrically mounted on the tool holders, and the input shaft of the tool holder is fixedly connected to the driving components. The device also includes:

[0007] An adjustment assembly installed between the indexing plate and the plurality of tool holders is used to adjust the machining diameter of the tool holders;

[0008] A switching assembly installed within the tool holder is used to switch the positions of the drill bit and tapping bit.

[0009] Preferably, a driving helical gear is fixedly installed on the input shaft of the multi-axis device, and multiple output shafts are rotatably installed in a circular array inside the multi-axis device, with driven helical gears meshing with the driving helical gears fixedly installed on the output shafts.

[0010] Preferably, the drive component includes a spline telescopic rod and spherical universal joints rotatably mounted at both ends of the spline telescopic rod, with one end of the spline telescopic rod connected to the output shaft of the multi-axis device via the spherical universal joint.

[0011] Preferably, the adjusting assembly includes a fixed ring and an adjusting disk. The fixed ring is concentrically fixedly installed on the bottom of the indexing disk. The inner circular surface of the fixed ring is integrally formed with multiple guide strips in a ring array. The guide strips are arranged radially along the fixed ring. A first sliding groove is opened on the guide strip, and a slider is slidably installed in the first sliding groove. The adjusting disk is rotatably installed relative to the fixed ring. The adjusting disk is arranged in a ring array with multiple second sliding grooves, and the second sliding grooves are inclined relative to the first sliding grooves. The slider is simultaneously slidably assembled with the second sliding grooves. The forward and reverse rotation of the adjusting disk drives the slider to expand and contract radially along the fixed ring.

[0012] Preferably, the adjustment assembly further includes two semi-circular slide rails, and an annular retaining strip that slides and is slidably fitted on the top of the adjustment disk is fixedly installed. The adjustment disk is mounted on the fixed ring via the two slide rails, and an adjustment gear ring that meshes with the adjustment gear is fixedly fitted on the outer circle of the adjustment disk.

[0013] Preferably, the switching assembly includes a driving gear and a driven gear. The driving gear is fixedly mounted on the input shaft of the tool holder. There are two driven gears symmetrically arranged around the axis of the driving gear and both mesh with the driving gear. A spline sleeve is fixedly inserted into the driven gear. A rotating disk is rotatably mounted on the bottom of the tool holder. The driven gear is rotatably mounted on the rotating disk through the spline sleeve. Two spline rods that are driven and assembled with the spline sleeve are also movably inserted on the rotating disk. The drill bit and tapping bit are respectively fixedly mounted on one end of the two spline rods.

[0014] Preferably, the switching assembly further includes a shaft bracket fixedly mounted on the input shaft of the tool holder, an electric push cylinder fixedly mounted on the shaft bracket, the telescopic end of the electric push cylinder being fixedly connected to the other end of the spline rod, and an electric slip ring being fixedly mounted on the inner wall of the tool holder, with the signal input end of the electric push cylinder being electrically connected to the sliding end of the electric slip ring.

[0015] Preferably, the switching assembly further includes a ratchet and a pair of matching pawls. The ratchet is fixedly mounted on one end of the input shaft of the tool holder, and the pawls are rotatably mounted on the rotating disk. A torsion spring is fixedly connected between the shaft of the pawls and the rotating disk.

[0016] The beneficial effects of this invention are:

[0017] This invention achieves single-axis power input and multi-axis synchronous output through a multi-axis device, enabling simultaneous drilling or tapping of multiple holes in one operation. Combined with an indexing and rotation function, it can quickly complete the machining of a full circle of holes, eliminating the need for single-axis equipment to move holes one by one and repeatedly clamp, significantly shortening the machining cycle. Furthermore, the use of an adjustment component allows for synchronous stepless adjustment of the pitch circle diameter of all tool holders, quickly adapting to the hole distribution dimensions of different specifications of water pump castings. It eliminates the need for customized equipment for a single model, reducing the number of equipment purchased and the space occupied, and lowering the equipment investment cost for multi-variety production. Simultaneously, the single tool holder integrates the drill bit and tapping head, relying on a purely mechanical reversing structure of ratchet and pawl to achieve station switching. The workpiece can be clamped once to complete both drilling and tapping operations, eliminating the need for a separate tapping device and reducing process flow time. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a water-cooled drilling device for the production of water pump castings proposed in this invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the multi-spindle in a water-cooled drilling device for water pump casting production proposed in this invention.

[0021] Figure 3 This is a schematic diagram of the indexing plate in a water-cooled drilling device for water pump casting production proposed in this invention;

[0022] Figure 4 This is a schematic diagram of the drive component in a water-cooled drilling device for water pump casting production proposed in this invention.

[0023] Figure 5 This is a schematic diagram of the adjusting component in a water-cooled drilling device for water pump casting production proposed in this invention;

[0024] Figure 6 This is a schematic diagram illustrating the principle of adjusting the machining diameter in a water-cooled drilling device for water pump casting production proposed in this invention.

[0025] Figure 7 This is a schematic diagram of the internal structure of the tool holder in a water-cooled drilling device for water pump casting production proposed in this invention.

[0026] Figure 8 This is a schematic diagram of the switching component in a water-cooled drilling device for water pump casting production proposed in this invention.

[0027] Figure 9 This is a schematic diagram of the installation of ratchet and pawl in a water-cooled drilling device for water pump casting production proposed in this invention.

[0028] Figure 10 This is a schematic diagram illustrating the principle of drill bit and tapping bit reversal in a water-cooled drilling device for water pump casting production proposed in this invention.

[0029] In the diagram: 1. Base; 101. Workpiece placement table; 102. Column; 103. Spindle box;

[0030] 2. Multi-spindle assembly; 201. Driving helical gear; 202. Driven helical gear;

[0031] 3. Indexing plate; 301. Adjusting gear;

[0032] 4. Drive components; 401. Splined telescopic rod; 402. Spherical universal joint;

[0033] 5. Adjustment components; 501. Fixed ring; 502. Adjustment disc; 503. Slider; 504. Slide rail; 505. Annular retaining strip; 506. Adjustment gear ring; 507. Guide bar;

[0034] 6. Tool holder; 601. Rotary disk; 602. Electric slip ring;

[0035] 7. Switching components; 701. Drive gear; 702. Driven gear; 703. Shaft bracket; 704. Spline sleeve; 705. Electric actuator; 706. Spline rod; 707. Ratchet; 708. Pawl;

[0036] 8. Drill bit;

[0037] 9. Tapping head. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0039] refer to Figures 1-10 This invention discloses a water-cooled drilling device for the production of water pump castings, including a base 1, a multi-spindle head 2 for power transmission, and multiple tool holders 6 for mounting drill bits. (See reference...) Figure 1A column 102 is fixedly installed on the top of the base 1, and a liftable workpiece placement platform 101 is installed on the column 102. The lifting of the workpiece placement platform 101 is mainly achieved by a motor drive mechanism installed at the base of the workpiece placement platform 101. The motor drive mechanism is based on the principle of a motor driving gears, and a rack is installed longitudinally on the column 102. The lifting of the workpiece placement platform 101 is achieved through the meshing of the gears and racks. The motor drive mechanism is also equipped with a self-locking mechanism so that the workpiece placement platform 101 can be suspended at any height. This allows for the processing of water pump casting shells of different heights. The surface of the workpiece placement platform 101 is provided with T-shaped clamping slots and positioning pin holes to accommodate the positioning and clamping of water pump castings of different specifications. A spindle box 103 is movably inserted into the top of the column 102. The output shaft of the spindle box 103 is located directly above the workpiece placement platform 101. A mechanism for driving the spindle box is installed inside the column 102. The hydraulic cylinder 103 is used for lifting. The spindle box 103 is also equipped with an indexing motor for driving the spindle indexing rotation. The indexing motor mainly controls the rotation of the indexing plate 3 to realize the machining of holes in multiples of 6 on the tool holder. For example, if a six-axis tool holder is used, after drilling is completed, the indexing motor drives the indexing plate 3 to rotate 30 degrees to realize the machining of 12 holes. The output shaft of the spindle box 103 is fixedly connected to the input shaft of the multi-axis device 2. It also includes an adjustment component 5 installed between the indexing plate 3 and multiple tool holders 6 to adjust the machining diameter of the tool holders 6. A switching component 7 installed in the tool holders 6 is used to change the position of the drill bit 8 and the tapping head 9. In summary, the hydraulic cylinder drives the spindle box 103 to make vertical feed motion along the column 102 to provide axial feed force for the drilling process. The indexing motor can drive the spindle to drive the multi-axis device 2 to make indexing rotation to adjust the hole machining angle and adapt to the hole machining requirements of different circumferential distribution on the end face of the casting.

[0040] refer to Figure 2 The input shaft of the multi-spindle unit 2 is fixedly mounted with a driving helical gear 201. Multiple output shafts are rotatably mounted in a ring array inside the multi-spindle unit 2, and driven helical gears 202 that mesh with the driving helical gear 201 are fixedly mounted on the output shafts. The driving helical gear 201 and all driven helical gears 202 are driven by spiral bevel gear meshing, which provides smooth transmission and strong load-bearing capacity. The rotational power of a single input shaft is synchronously distributed to multiple output shafts in a ring array through gear meshing. The speed and direction of each output shaft are completely consistent, ensuring the synchronicity of drilling operations of each tool holder 6.

[0041] refer to Figure 3The multi-spindle unit 2 has an umbrella-shaped indexing plate 3 fixedly installed at its bottom. The indexing plate 3 contains multiple drive components 4 connected to the output shaft of the multi-spindle unit 2 for power transmission. Drill bits 8 and tapping heads 9 are symmetrically installed on the tool holder 6, and the input shaft of the tool holder 6 is fixedly connected to the drive components 4. The unit also includes an adjustment component 5 installed at the bottom of the indexing plate 3 for adjusting the machining diameter of the tool holder 6, and a switching component 7 installed in the tool holder 6 for changing the position of the drill bits 8 and tapping heads 9. The indexing plate 3 adopts a hollow umbrella-shaped shell structure with reserved space for the movement of the drive components 4, which can accommodate the extension and deflection of the drive components 4 as the tool holder 6 is radially adjusted. The adjustment component 5 is embedded in the mounting cavity at the bottom of the indexing plate 3. When multiple sets of tool holders 6 move radially synchronously with the adjustment component 5, the drive components 4 can adaptively adjust their length and angle to maintain the stability of power transmission.

[0042] refer to Figure 4 The drive component 4 includes a spline telescopic rod 401 and spherical universal joints 402 rotatably mounted at both ends of the spline telescopic rod 401. One end of the spline telescopic rod 401 is connected to the output shaft of the multi-axis device 2 through the spherical universal joint 402. The input shaft of the tool holder 6 is connected to the other end of the spline telescopic rod 401 through the spherical universal joint 402. The spline telescopic rod 401 is composed of an outer spline shaft and an inner spline sleeve that are slidably inserted together. It can freely extend and retract along the axial direction to compensate for the change in axial distance between the tool holder 6 and the output shaft after radial movement. The spherical universal joints 402 at both ends can achieve multi-directional angle deflection to counteract the axial deflection angle caused by the radial displacement of the tool holder 6 and ensure that the power can still be stably transmitted in the deflection state.

[0043] refer to Figure 5 The adjusting component 5 includes a fixed ring 501 and an adjusting disk 502. The fixed ring 501 is concentrically fixedly installed at the bottom of the indexing disk 3. The inner circular surface of the fixed ring 501 is integrally formed with multiple guide strips 507 in a ring array. The guide strips 507 are arranged radially along the fixed ring 501. A first groove is opened on the guide strip 507 and a slider 503 is slidably installed in the first groove. The adjusting disk 502 is rotatably installed relative to the fixed ring 501. The adjusting disk 502 is arranged in a ring array with multiple second grooves and the second grooves are inclined relative to the first grooves. The slider 503 is simultaneously slidably assembled with the second grooves. The tool holder 6 is fixedly installed at the bottom of the slider 503. The adjusting disk 502 rotates in both directions to drive the slider 503 to expand and contract radially along the fixed ring 501.

[0044] The first slide groove is a straight guide groove extending radially along the fixed ring 501, which radially constrains the movement direction of the slider 503. The second slide groove is an oblique guide groove inclined relative to the radial direction. When the adjusting disk 502 rotates around its own axis, the inner wall of the second slide groove pushes the slider 503 to slide radially along the first slide groove. All sliders 503 synchronously contract centripetally or expand outward. For details, please refer to [reference needed]. Figure 6This enables synchronous stepless adjustment of the machining pitch circle diameter for all 6 tool holders;

[0045] The adjustment assembly 5 also includes two semi-circular slide rails 504. The top of the adjustment disk 502 is fixedly installed with an annular retaining strip 505 that slides with the slide rails 504. The adjustment disk 502 is installed on the fixed ring 501 through the two slide rails 504. The outer circle of the adjustment disk 502 is fixedly fitted with an adjustment gear ring 506 that meshes with the adjustment gear 301.

[0046] The adjusting gear 301 is rotatably mounted on the edge of the indexing plate 3, and a motor for driving the adjusting gear 301 to rotate is also fixedly mounted on the indexing plate 3. When the adjusting gear 301 rotates, it can mesh and drive the adjusting gear ring 506 to rotate synchronously with the adjusting plate 502, thereby completing the adjustment of the processing diameter. The slide rail 504 and the annular retaining strip 505 have a T-shaped interlocking structure, which forms an axial limit on the adjusting plate 502 to prevent the adjusting plate 502 from axially loosening, while ensuring that the adjusting plate 502 can rotate smoothly in the circumferential direction.

[0047] refer to Figure 7 and Figure 8 The switching component 7 includes a drive gear 701 and a driven gear 702. The drive gear 701 is fixedly mounted on the input shaft of the tool holder 6. Two driven gears 702 are symmetrically arranged around the axis of the drive gear 701 and both mesh with the drive gear 701. A spline sleeve 704 is fixedly inserted into the driven gear 702. A rotating disk 601 is rotatably mounted on the bottom of the tool holder 6 and is damped to prevent the rotating disk 601 from spinning freely and affecting the machining accuracy. The pump housing casting is circumferentially drilled without the need for a specific starting angle. This is only for workpieces with special angled holes. The driven gear 702 is rotatably mounted via the spline sleeve 704. On the rotating disk 601, two splined rods 706 are movably inserted and are connected to the splined sleeve 704 for transmission. The drill bit 8 and the tapping head 9 are respectively fixedly installed at one end of the two splined rods 706. The splined rods 706 and the splined sleeve 704 are connected by spline transmission, which can transmit rotational torque and slide relative to each other along the axial direction. The two splined rods 706 are symmetrically distributed on both sides of the input axis of the tool holder 6. The axes of the drill bit 8 and the tapping head 9 are parallel to the input axis of the tool holder 6. When the splined rods 706 extend axially, the corresponding tool enters the working position. When they retract axially, the corresponding tool leaves the working position.

[0048] The switching assembly 7 also includes a shaft bracket 703 fixedly mounted on the input shaft of the tool holder 6. An electric push cylinder 705 is fixedly mounted on the shaft bracket 703. The telescopic end of the electric push cylinder 705 is fixedly connected to the other end of a splined rod 706. An electric slip ring 602 is fixedly mounted on the inner wall of the tool holder 6, and the signal input end of the electric push cylinder 705 is electrically connected to the sliding end of the electric slip ring 602. The shaft bracket 703 rotates synchronously with the input shaft of the tool holder 6, and the electric push cylinder 705 rotates synchronously with the shaft bracket 703. The fixed end of 02 is fixedly connected to the housing of the tool holder 6, and the sliding end rotates synchronously with the input shaft. It can continuously transmit control signals and power to the electric push cylinder 705 in the rotating state. The extension and retraction of the electric push cylinder 705 can drive the spline rod 706 to move back and forth along the axis, realizing the extension and retraction switching of the drill bit 8 and the tapping head 9. Both the drill bit 8 and the tapping head 9 are equipped with water cooling interfaces. By connecting to external water cooling equipment, water is supplied in conjunction when the corresponding drill bit descends and feeds, so as to achieve the purpose of cooling the corresponding drill bit during processing.

[0049] refer to Figure 9 The switching component 7 also includes a ratchet 707 and a pair of matching pawls 708. The ratchet 707 is fixedly mounted on one end of the input shaft of the tool holder 6, and the pawls 708 are rotatably mounted on the rotating disk 601. A torsion spring is fixedly connected between the shaft of the pawls 708 and the rotating disk 601. The ratchet 707 rotates synchronously with the input shaft of the tool holder 6, and the two pawls 708 are symmetrically mounted on the rotating disk 601. The torsion spring provides a continuous contact force for the pawls 708. When the input shaft of the tool holder 6 rotates in the forward direction, the pawls 708 slip on the tooth surface of the ratchet 707, and the rotating disk 601 remains stationary under the action of damping, and the tool maintains its current position. When the input shaft of the tool holder 6 rotates in the reverse direction, the pawls 708 engage with the tooth groove of the ratchet 707, causing the rotating disk 601 to rotate 180 degrees synchronously with the input shaft, completing the position switching between the drill bit 8 and the tapping head 9. (See details...) Figure 10 Assuming A is drill bit 8 and B is tapping bit 9, in the first configuration, A is positioned further out than B, making it suitable for drilling holes near the center of the pump casing, i.e., at the pipe connection point. Because the pump casing surface is uneven, B is located on the inner circle of the pipe connection point and will not interfere with the surface. At the same time, the first configuration is also suitable for tapping holes near the outer edge of the pump casing, i.e., at the pump casing mounting holes. In the second configuration, A is positioned further out than B, and similarly, it is suitable for tapping holes near the center of the pump casing, i.e., at the pipe connection point, or for drilling holes near the outer edge of the pump casing, i.e., at the pump casing mounting point.

[0050] In summary, the power splitting transmission principle is as follows: the output shaft of the spindle box drives the input shaft of the multi-spindle unit to rotate. The active helical gear at the end of the input shaft meshes with the driven helical gears of all the ring arrays to transmit power, splitting the single-path rotational power at the same speed and in the same direction to multiple output shafts. Each output shaft transmits torque to the corresponding tool holder input shaft through a driving component. The spline telescopic rod can freely extend and retract along the axial direction to compensate for the axial spacing change caused by the radial displacement of the tool holder. The spherical universal joints at both ends can achieve multi-directional angular deflection to counteract the axial deflection caused by the displacement of the tool holder, ensuring stable power transmission throughout the diameter adjustment process.

[0051] The specific working principle is as follows:

[0052] During the machining preparation stage, the water pump casting to be processed is positioned and clamped using the T-shaped clamping slot and locating pin on the workpiece placement table. The workpiece placement table is then driven to rise and fall along the column to the appropriate height based on the axial height of the casting and locked by a self-locking mechanism. Based on the distribution diameter parameters of the hole positions on the casting end face, the machining pitch circle diameter of each tool holder is pre-adjusted to align the machining center of the tool holder with the center of the hole position on the casting. When the hole distribution diameter needs adjustment, the drive motor on the side of the indexing plate drives the adjusting gear to rotate, meshing with the adjusting gear ring to drive the adjusting plate to rotate coaxially around the fixed ring. The second sliding groove, arranged in annular inclination on the adjusting plate, pushes against the slider as it rotates. Under the constraint of the first sliding groove of the radial guide bar of the fixed ring, all sliders synchronously contract radially inward or extend radially, synchronously driving the radial displacement of the bottom tool holders, achieving synchronous stepless adjustment of the machining pitch circle diameter of all tool holders. The slide rail and the annular retaining strip adopt a T-shaped interlocking structure to form an axial limit on the adjusting plate, ensuring smooth circumferential rotation and preventing axial loosening.

[0053] When the tool holder input shaft rotates in the forward direction, the driving gear on the shaft meshes synchronously with the driven gears on both sides and rotates in the opposite direction. Through the spline transmission of the spline sleeve and spline rod, the drill bit and tapping head are driven to rotate synchronously. At this time, the ratchet rotates in the forward direction with the input shaft, the pawl slips along the ratchet tooth surface, and the rotating disk remains stationary under the action of damping. The tool position of the current station is stable. The electric slip ring continuously supplies power and transmits control signals to the electric pusher cylinder that rotates with the shaft. The electric pusher cylinder pushes the spline rod of the corresponding working position to extend axially, so that the corresponding tool enters the machining position. The other tool retracts with the spline rod to avoid it. The spindle box drives the entire machining unit to feed downward to complete the drilling or tapping operation of the hole. During the machining process, the water cooling interface of the working tool is connected to water supply to cool the drilling area and the tool. If it is necessary to change the position of the drill bit and the tapping head, the tool holder input shaft is controlled to rotate in the opposite direction. The ratchet rotates synchronously with the shaft. The pawl is engaged in the ratchet tooth groove under the force of the torsion spring, which drives the rotating disk to rotate 180° synchronously with the input shaft to realize the circumferential position exchange of the drill bit and the tapping head. After rotating into position, the electric pusher cylinder adjusts the extension and retraction state of the two spline rods accordingly, so that the switched working tool extends and the non-working tool retracts to avoid it, thus completing the switching of the drilling and tapping process. The damping structure of the rotating disk can ensure the stability of the position locking after switching and avoid the displacement of the index during the machining process.

[0054] When the total number of holes in the casting exceeds the number of tool holders, the indexing motor drives the spindle to rotate the multi-spindle, indexing plate and tool holder as a whole in an indexing rotation. After rotating the corresponding angle, it feeds again for machining. Through the cycle of "machining-indexing-remachining", the drilling and tapping of all holes on the end face of the casting is completed.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water-cooled drilling device for the production of water pump castings, characterized in that, The system includes a base (1), a multi-spindle unit (2) for power transmission, and multiple tool holders (6) for mounting drill bits. A dividing plate (3) is fixedly mounted on the bottom of the multi-spindle unit (2). Multiple drive units (4) connected to the output shaft of the multi-spindle unit (2) are disposed within the dividing plate (3) for power transmission. Multiple tool holders (6) are arranged in a circular array at the bottom of the dividing plate (3). Drill bits (8) and tapping heads (9) are symmetrically mounted on each tool holder (6), and the input shaft of each tool holder (6) is fixedly connected to the drive units (4). The system also includes: An adjustment assembly (5) is installed between the indexing plate (3) and the plurality of tool holders (6) for adjusting the machining diameter of the tool holders (6); A switching assembly (7) installed in the tool holder (6) is used to switch the positions of the drill bit (8) and the tapping head (9).

2. The water-cooled drilling device for producing water pump castings according to claim 1, characterized in that, The input shaft of the multi-axis device (2) is fixedly mounted with an active helical gear (201), and multiple output shafts are rotatably mounted in a ring array inside the multi-axis device (2), with a driven helical gear (202) fixedly mounted on the output shaft to mesh with the active helical gear (201).

3. A water-cooled drilling device for producing water pump castings according to claim 1, characterized in that, The drive unit (4) includes a spline telescopic rod (401) and spherical universal joints (402) rotatably mounted on both ends of the spline telescopic rod (401). One end of the spline telescopic rod (401) is connected to the output shaft of the multi-axis device (2) through the spherical universal joint (402).

4. A water-cooled drilling device for producing water pump castings according to claim 1, characterized in that, The adjustment component (5) includes a fixed ring (501) and an adjustment disk (502). The fixed ring (501) is concentrically fixed at the bottom of the indexing disk (3). The inner circular surface of the fixed ring (501) is integrally formed with multiple guide strips (507) in a ring array. The guide strips (507) are arranged radially along the fixed ring (501). The guide strips (507) have a first groove and a slider (503) is slidably installed in the first groove. The adjustment disk (502) is rotatably installed relative to the fixed ring (501). The adjustment disk (502) has multiple second grooves in a ring array and the second grooves are inclined relative to the first grooves. The slider (503) is simultaneously slidably assembled with the second grooves. The adjustment disk (502) rotates in both directions, causing the slider (503) to expand and contract radially along the fixed ring (501).

5. A water-cooled drilling device for producing water pump castings according to claim 4, characterized in that, The adjustment assembly (5) also includes two semi-circular slide rails (504). The top of the adjustment disk (502) is fixedly installed with an annular retaining strip (505) that slides with the slide rails (504). The adjustment disk (502) is installed on the fixed ring (501) through the two slide rails (504). The outer circle of the adjustment disk (502) is fixedly fitted with an adjustment gear ring (506) that meshes with the adjustment gear (301).

6. A water-cooled drilling device for producing water pump castings according to claim 1, characterized in that, The switching assembly (7) includes a drive gear (701) and a driven gear (702). The drive gear (701) is fixedly mounted on the input shaft of the tool holder (6). There are two driven gears (702) symmetrically arranged around the axis of the drive gear (701) and both mesh with the drive gear (701). A spline sleeve (704) is fixedly inserted inside the driven gear (702). A rotating disk (601) is rotatably mounted on the bottom of the tool holder (6). The driven gear (702) is rotatably mounted on the rotating disk (601) through the spline sleeve (704). Two spline rods (706) that are driven and assembled with the spline sleeve (704) are also movably inserted on the rotating disk (601). The drill bit (8) and the tapping head (9) are respectively fixedly mounted on one end of the two spline rods (706).

7. A water-cooled drilling device for producing water pump castings according to claim 6, characterized in that, The switching assembly (7) also includes a shaft bracket (703) fixedly mounted on the input shaft of the tool holder (6). An electric push cylinder (705) is fixedly mounted on the shaft bracket (703). The telescopic end of the electric push cylinder (705) is fixedly connected to the other end of the spline rod (706). An electric slip ring (602) is fixedly mounted on the inner wall of the tool holder (6), and the signal input end of the electric push cylinder (705) is electrically connected to the sliding end of the electric slip ring (602).

8. A water-cooled drilling device for producing water pump castings according to claim 7, characterized in that, The switching assembly (7) also includes a ratchet (707) and a pair of matching pawls (708). The ratchet (707) is fixedly mounted on one end of the input shaft of the tool holder (6), and the pawls (708) are rotatably mounted on the rotating disk (601). A torsion spring is fixedly connected between the shaft of the pawls (708) and the rotating disk (601).

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