A machining fixture for the main housing of an engine water pump

Abstract

This utility model relates to the field of automotive parts manufacturing and discloses a machining fixture for an engine water pump main housing, including a worktable, an indexing turntable, a first fixture structure, and a second fixture structure. The first fixture structure includes multiple first locating pin seats and a first clamping device; the second fixture structure includes multiple second locating pin seats, a second clamping device, a support cylinder, and a third clamping device. The machining fixture for the engine water pump main housing provided by this utility model is specifically designed for machining oblique holes and side holes. Because the first and second fixture structures are arranged side-by-side to form a dual-station configuration, the long-distance transport of the workpiece between the two stations is eliminated. The rapid rotation of the indexing turntable enables seamless process connection, significantly shortening auxiliary time. It ensures consistent machining accuracy for the oblique hole angle and the inner wall roughness of the side hole, reducing product defect rates caused by handling or clamping errors.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing, and in particular to a machining fixture for the main housing of an engine water pump. Background Technology

[0002] In the manufacturing process of engine water pumps, the main housing is a core component, and its machining accuracy directly affects the pump's sealing performance and operating efficiency. After being die-cast, the main housing requires further precision machining using CNC machine tools. Key processes include drilling a through-hole at the center and precision machining of the side holes. These two processes demand extremely high machining accuracy; deviations in the angle of the through-hole and roughness of the inner wall of the side holes can directly lead to problems such as water pump leakage or abnormal operating noise.

[0003] Currently, the industry generally adopts a single-station machining mode for the above two processing steps. Specifically, due to the different processing directions and positioning requirements of the two steps, two independent CNC machine tools are required, and each machine tool needs to be equipped with a corresponding indexing rotary table. During processing, the operator must first clamp the engine water pump main housing 6 in a vertical position on the fixture of the first machine tool, adjust it to the angle required for machining the inclined hole 61 using the indexing rotary table, and then unload the workpiece from the fixture after machining the inclined hole 61. Subsequently, the workpiece needs to be manually or transported over a long distance to the second machine tool, and then clamped in a vertical position on another set of fixtures. The angle is adjusted again using the indexing rotary table to meet the positioning requirements for the finishing of the side hole, and finally the machining of the side hole 62 is completed. For details of the machined engine water pump main housing 6, please refer to [reference needed]. Figure 3 and Figure 4 .

[0004] This single-station processing mode has many drawbacks: on the one hand, the configuration of two CNC machine tools and two indexing rotary tables significantly increases the equipment investment cost and workshop floor space; on the other hand, the long-distance handling of workpieces between the two stations not only consumes time but also reduces production efficiency.

[0005] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a machining fixture for the main housing of an engine water pump. The machining fixture has two stations and can simultaneously perform oblique hole and side hole machining on the workpieces at the two stations respectively.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A machining fixture for an engine water pump main housing includes a laterally extending worktable, an indexing turntable for driving the worktable to rotate, a first fixture structure disposed on the worktable to form a first workstation, and a second fixture structure disposed on the worktable to form a second workstation. The first fixture structure includes multiple first locating pins for positioning bottom holes of the engine water pump main housing and a first clamping device for pressing down on the bottom of the engine water pump main housing. The second fixture structure includes multiple second locating pins for positioning bottom holes of the engine water pump main housing, a second clamping device for pressing down on the bottom of the engine water pump main housing, a support cylinder for supporting the top mounting ears of the engine water pump main housing, and a third clamping device for cooperating with the support cylinder to clamp the top mounting ears of the engine water pump main housing. The first hole to be machined on the engine water pump main housing at the first workstation faces forward, and the second hole to be machined on the engine water pump main housing at the second workstation faces forward.

[0009] As a further improvement to the above technical solution, the workbench is provided with a clearance notch located in front of the first work station.

[0010] As a further improvement to the above technical solution, both the first and second clamping devices are provided with three lever clamping cylinders.

[0011] As a further improvement to the above technical solution, the workbench is provided with a recessed groove for installing the first clamping device and the second clamping device.

[0012] As a further improvement to the above technical solution, the first fixture structure also includes a plurality of first anti-reverse mounting blocks disposed on the worktable, and the second fixture structure also includes a plurality of second anti-reverse mounting blocks disposed on the worktable.

[0013] As a further improvement to the above technical solution, the workbench is provided with a first support seat corresponding to the first clamping device and a second support seat corresponding to the second clamping device.

[0014] As a further improvement to the above technical solution, the workbench is provided with a water spray nozzle for rinsing the first support seat and the second support seat.

[0015] As a further improvement to the above technical solution, the third clamping device and the support cylinder are mounted on the raised seat.

[0016] The beneficial effects of this utility model are as follows: The machining fixture for the main housing of the engine water pump provided by this utility model is specifically designed for machining oblique holes and side holes. Since the first fixture structure and the second fixture structure are arranged side by side to form a dual workstation, only one CNC machine tool and one indexing turntable are needed to complete the two processes, which significantly reduces the equipment purchase cost, saves workshop floor space, and eliminates the long-distance transportation of workpieces between the two workstations. The rapid flipping of the indexing turntable realizes the connection of processes, greatly shortening the auxiliary time; it ensures the consistency of machining accuracy of the oblique hole angle and the inner wall roughness of the side hole, and reduces the product defect rate caused by handling or clamping errors. Attached Figure Description

[0017] Figure 1 A perspective view of the machining fixture provided by this utility model after clamping the main housing of the engine water pump.

[0018] Figure 2 A schematic diagram of the machining fixture provided by this utility model.

[0019] Figure 3 Three-dimensional structure of the engine water pump main housing Figure 1 .

[0020] Figure 4 Three-dimensional structure of the engine water pump main housing Figure 2 .

[0021] Explanation of main component symbols: 1-Workbench, 11-Avoidance notch, 12-Sinking groove, 2-Indexing turntable, 3-First clamping structure, 31-First locating pin seat, 32-First clamping device, 33-First anti-reverse block, 34-First support seat, 4-Second clamping structure, 41-Second locating pin seat, 42-Second clamping device, 43-Support cylinder, 44-Third clamping device, 45-Second anti-reverse block, 46-Second support seat, 47-Elevation seat, 5-Water spray nozzle, 6-Engine water pump main housing, 61-Angled hole, 62-Side hole, 63-Mounting ear, 64-Bottom hole. Detailed Implementation

[0022] This utility model provides a machining fixture for the main housing of an engine water pump. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.

[0023] Please see Figures 1 to 4This utility model provides a machining fixture for an engine water pump main housing, including a laterally extending worktable 1, an indexing rotary table 2 for driving the worktable 1 to rotate, a first fixture structure 3 formed on the worktable 1 to form a first work position, and a second fixture structure 4 formed on the worktable 1 to form a second work position. The first fixture structure 3 includes a plurality of first positioning pins 31 for positioning the bottom holes 64 of the engine water pump main housing 6, and a first clamping device 32 for pressing down on the bottom of the engine water pump main housing 6; the second fixture structure 4 includes... It includes multiple second positioning pin seats 41 for positioning the bottom holes 64 of the engine water pump main housing 6, a second clamping device 42 for pressing down the bottom of the engine water pump main housing 6, a support cylinder 43 for supporting the top mounting ears 63 of the engine water pump main housing 6, and a third clamping device 44 for cooperating with the support cylinder 43 to clamp the top mounting ears 63 of the engine water pump main housing 6; the first hole to be processed on the engine water pump main housing 6 at the first station faces forward, and the second hole to be processed on the engine water pump main housing 6 at the second station faces forward.

[0024] At the first station, the operator places the engine water pump main housing 6 to be processed in an upright position. The first positioning pin 31 is inserted into the bottom hole 64 for precise positioning. Then, the first clamping device 32 presses down on the bottom of the housing to achieve stable clamping of the workpiece at the first station. At this time, the oblique hole 61 in the middle of the engine water pump main housing 6 faces the front of the processing equipment. At the second station, the workpiece is also placed in an upright position. It should be noted that the workpiece at the second station is the workpiece that has been processed at the first station. After the bottom hole 64 is positioned by the second positioning pin 41, the second clamping device 42 presses down on the bottom. At the same time, the support cylinder 43 rises to support the top mounting lug 63 of the engine water pump main housing 6. The third clamping device 44 cooperates with the support cylinder 43 to clamp the mounting lug 63, forming a double fixation to ensure the stability of the workpiece. At this time, the side hole 62 of the housing faces the front of the processing equipment.

[0025] In the initial state, the worktable 1 is placed horizontally. The indexing turntable 2 drives the worktable 1 to rotate (specifically, rotate it backward by 120°) so that the first station is aligned with the machining tool of the CNC machine tool. The through machining of the inclined hole 61 is completed using a preset angle. After the inclined hole 61 is machined, the indexing turntable 2 rotates the worktable 1 again and rotates the second station to the machining position (i.e., rotate it forward by 30° so that the side hole 62 is vertically facing upward). At this time, the side hole 62 is facing the tool, and the finishing machining of the inside of the side hole 62 is completed.

[0026] The machining fixture for the engine water pump main housing 6 provided by this utility model is specifically designed for machining oblique holes and side holes. Since the first fixture structure 3 and the second fixture structure 4 are arranged side by side to form a dual workstation, only one CNC machine tool and one indexing turntable 2 are needed to complete the two processes, which significantly reduces the equipment purchase cost, saves workshop floor space, and eliminates the long-distance transportation of workpieces between the two workstations. The process connection is achieved by the rapid flipping of the indexing turntable 2, which greatly shortens the auxiliary time. It ensures the consistency of machining accuracy of the angle of the oblique hole 61 and the inner wall roughness of the side hole 62, and reduces the product defect rate caused by handling or clamping errors.

[0027] See Figure 1 As shown, the worktable 1 has a clearance notch 11 located in front of the first workstation. This clearance notch 11 provides sufficient space for the CNC machine tool's cutting tool to move when machining the inclined hole 61 at the first workstation. Since the inclined hole 61 has an inclination angle, the cutting tool needs to penetrate deep into the workpiece and feed at a corresponding angle during machining. The clearance notch 11 effectively prevents the cutting tool from colliding or rubbing against the worktable 1, preventing damage to the cutting tool due to collision, and also preventing the worktable 1 from being scratched, thus avoiding a decrease in accuracy and ensuring the safe and stable operation of the machining process.

[0028] In this embodiment, both the first clamping device 32 and the second clamping device 42 are equipped with three lever clamping cylinders. From the perspective of clamping stability, the three lever clamping cylinders can form a multi-point uniform clamping force on the bottom of the engine water pump main housing 6. Compared to single-point or two-point clamping, the three-point distribution better matches the force characteristics of the bottom of the housing, avoiding local deformation of the housing due to concentrated force, and effectively preventing workpiece displacement due to vibration during processing, ensuring that the workpiece maintains a stable positioning state during processing, providing reliable assurance for processing accuracy. The lever clamping cylinder has the characteristics of being labor-saving and having adjustable clamping force. Its lever structure can generate a large clamping force with a small driving force, and the clamping force can be flexibly adjusted according to the material and structural strength of the engine water pump main housing 6. This ensures sufficient clamping force to prevent workpiece loosening while avoiding damage to the housing due to excessive clamping force, making it particularly suitable for the relatively precise engine water pump main housing 6 after die casting.

[0029] The workbench 1 has a recessed groove 12 for mounting the first clamping device 32 and the second clamping device 42. From the perspective of workpiece position adaptability, when the engine water pump main housing 6 is vertically clamped, the height limitations of the first locating pin seat 31 and the second locating pin seat 41 impose specific requirements on the relative position of the bottom of the workpiece to the workbench 1. The recessed groove 12 makes the mounting height of the first clamping device 32 and the second clamping device 42 more closely match the actual position of the bottom of the workpiece, preventing the clamping devices from exceeding the adaptability range of the workpiece bottom due to excessive height.

[0030] The main housing 6 of the engine water pump has a complex structure, with directional distribution of parts such as the bottom holes 64 and the top mounting ears 63. If the workpiece is placed backwards due to operational negligence during clamping, it will directly cause a serious deviation in the machining position of the oblique hole 61 or the side hole 62, resulting in the scrapping of the workpiece. To address this, the first fixture structure 3 also includes multiple first anti-reverse blocks 33 set on the worktable 1, and the second fixture structure 4 also includes multiple second anti-reverse blocks 45 set on the worktable 1. The first anti-reverse blocks 33 and the second anti-reverse blocks 45 can form intuitive physical limits, eliminating the need for operators to spend too much effort judging the workpiece orientation. They only need to place the workpiece in an orientation that allows it to easily avoid the anti-reverse blocks, simplifying the clamping process, speeding up the clamping process, and helping to improve overall production efficiency.

[0031] See Figure 2 As shown, the worktable 1 is provided with a first support seat 34 corresponding to the first clamping device 32 and a second support seat 46 corresponding to the second clamping device 42. The first support seat 34 and the second support seat 46 can form a vertically corresponding and balanced force with the corresponding first clamping device 32 and second clamping device 42. When the first clamping device 32 presses down to the bottom of the engine water pump main housing 6, the first support seat 34 provides a stable support force for the workpiece from below, avoiding local deformation or uneven force on the workpiece due to only being subjected to downward clamping force; similarly, the second support seat 46 cooperates with the second clamping device 42 to form a reliable support and clamping fit for the bottom of the workpiece at the second work station, ensuring that the workpiece always maintains a stable posture during processing, further improving the clamping firmness.

[0032] Preferably, the worktable 1 is equipped with water spray nozzles 5 for rinsing the first clamping structure 3 and the second clamping structure 4. The water spray nozzles 5 can promptly remove impurities such as chips, coolant residue, and oil generated during processing. When the first clamping structure 3 and the second clamping structure 4 are clamping the engine water pump main housing 6, a large amount of metal debris will adhere to the surfaces of key components such as the locating pin seat, clamping device, and support seat. If not cleaned in time, these debris may affect the positioning accuracy of subsequent workpieces, causing workpiece clamping misalignment. The water spray nozzles 5 use high-pressure water to rinse the clamping structures, quickly washing away impurities, keeping the components of the clamping fixture clean, ensuring accurate positioning of the locating pin seat and reliable clamping of the clamping device, and reducing processing errors caused by impurity accumulation.

[0033] Preferably, the third clamping device 44 and the support cylinder 43 are mounted on the raised seat 47. The top mounting lug 63 of the engine water pump main housing 6 has a certain height. The raised seat 47 can compensate for this height, ensuring that the application points of the third clamping device 44 and the support cylinder 43 are precisely aligned with the position of the top mounting lug 63. If the raised seat 47 is not provided, the third clamping device 44 and the support cylinder 43 may not be able to effectively cooperate with the top mounting lug 63 due to insufficient installation height, causing the clamping force application point to deviate from the preset position and affecting the clamping effect on the top mounting lug 63. The raised seat 47 can flexibly adjust the height of the third clamping device 44 and the support cylinder 43 according to the actual height of the top mounting lug 63, ensuring that they can fit tightly against the mounting lug 63 during clamping, forming a stable clamping state and preventing the workpiece from shaking during processing due to insecure top fixation.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A machining fixture for the main housing of an engine water pump, characterized in that, The device includes a laterally extending worktable, an indexing turntable for driving the worktable to rotate, a first clamping structure set on the worktable to form a first workstation, and a second clamping structure set on the worktable to form a second workstation. The first clamping structure includes multiple first locating pins for positioning the bottom holes of the engine water pump main housing and a first clamping device for pressing down on the bottom of the engine water pump main housing. The second clamping structure includes multiple second locating pins for positioning the bottom holes of the engine water pump main housing, a second clamping device for pressing down on the bottom of the engine water pump main housing, a support cylinder for supporting the top mounting ears of the engine water pump main housing, and a third clamping device that cooperates with the support cylinder to clamp the top mounting ears of the engine water pump main housing. The oblique holes on the engine water pump main housing at the first workstation face forward, and the side holes on the engine water pump main housing at the second workstation face forward.

2. The machining fixture for the main housing of the engine water pump according to claim 1, characterized in that, The workbench has a clearance opening located in front of the first workstation.

3. The machining fixture for the main housing of the engine water pump according to claim 1, characterized in that, The first and second clamping devices are each equipped with three lever-type clamping cylinders.

4. The machining fixture for the main housing of the engine water pump according to claim 3, characterized in that, The workbench is provided with a recessed groove for installing the first clamping device and the second clamping device.

5. The machining fixture for the main housing of the engine water pump according to claim 1, characterized in that, The first clamping structure further includes multiple first anti-reverse blocks disposed on the worktable, and the second clamping structure further includes multiple second anti-reverse blocks disposed on the worktable.

6. The machining fixture for the main housing of the engine water pump according to claim 1, characterized in that, The workbench is provided with a first support seat corresponding to the first clamping device and a second support seat corresponding to the second clamping device.

7. The machining fixture for the main housing of the engine water pump according to claim 6, characterized in that, The workbench is equipped with water spray nozzles for rinsing the first and second support seats.

8. The machining fixture for the main housing of the engine water pump according to claim 1, characterized in that, The third clamping device and the support cylinder are mounted on the raised seat.

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