A general-purpose crankshaft milling center hole fixture

Abstract

This utility model relates to the field of machining fixture technology, specifically to a general-purpose crankshaft milling and centering fixture; it includes a base, a pusher, two sets of pressing parts, a fixture body, a pin, a pin locking block, a pin connecting sleeve, a support unit, two pressure plates, and two centering blocks. The pusher is connected to the base, both sets of pressing parts are connected to the base, and the two pressure plates are respectively connected to their corresponding pressing parts. The fixture body is fixedly connected to the base, the support unit is located on the outside of the fixture body, the pin connecting sleeve is fixedly connected to the pusher, one end of the pin locking block is fixedly connected to the pin connecting sleeve, and the other end of the pin is fixedly connected to the pin locking block. The pin is also movably connected to the fixture body, and the two centering blocks are movably mounted on the fixture body. By adopting the above, automatic centering can be achieved, ensuring that the crankshaft center is in the middle of the two plates, so that the static balance of the crankshaft meets customer requirements, improving machining accuracy and product quality.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, and in particular to a fixture for milling and drilling center holes in a crankshaft. Background Technology

[0002] In the machining process of a general-purpose crankshaft, milling the two end faces and drilling the center holes at both ends are key processes that have a significant impact on the machining accuracy and quality of the crankshaft.

[0003] Traditional fixtures have certain limitations in positioning and clamping, making it difficult to ensure that the crank center is accurately located in the middle of the two plates. This results in products that do not meet customer standards, affecting production efficiency and product quality. Utility Model Content

[0004] The purpose of this utility model is to provide a milling fixture for center holes of general-purpose crankshafts, which solves the problem that in the existing processing of general-purpose crankshafts, it is difficult to ensure that the crank center is accurately located in the middle of the two plates, resulting in products that do not meet customer standards, affecting production efficiency and product quality.

[0005] To achieve the above objectives, this utility model employs a general-purpose crankshaft milling center hole fixture, comprising a base, a pushing component, two sets of pressing components, a fixture body, a pin, a pin locking block, a pin connecting sleeve, a support unit, two pressure plates, and two centering blocks. The pushing component is connected to the base and located above the fixed base. Both sets of pressing components are connected to the base and symmetrically arranged above the base. The two pressure plates are respectively connected to the corresponding pressing components. The fixture body is fixedly connected to the base and located above the base. The support unit is located on the outside of the fixture body. The pin connecting sleeve is fixedly connected to the pushing component. One end of the pin locking block is fixedly connected to the pin connecting sleeve, and the other end of the pin is fixedly connected to the pin locking block. The pin is also movably connected to the fixture body. The two centering blocks are movably disposed on the fixture body.

[0006] The support unit includes a V-shaped fixing plate, a first V-shaped block, and a second V-shaped block. The V-shaped fixing plate is fixedly connected to the tooling body and is located on the outer side wall of the tooling body. The first V-shaped block is fixedly connected to the tooling body and is located on the outer side wall of the tooling body. The second V-shaped block is fixedly connected to the V-shaped fixing plate and is located on the outer side wall of the V-shaped fixing plate.

[0007] The pushing component includes a support and a first hydraulic cylinder. The support is fixedly connected to the base and located above the base. The first hydraulic cylinder is fixedly connected to the support and located above the support. The pin connecting sleeve is fixedly connected to the output end of the first hydraulic cylinder.

[0008] The pressing component includes a pad, a second hydraulic cylinder, a hydraulic lever connecting rod, a hinge, and a support rod. The second hydraulic cylinder is fixedly connected to the base and located above the base. The pad is fixedly connected to the second hydraulic cylinder and located above the second hydraulic cylinder. The support rod is fixedly connected to the pad and located above the pad. One end of the hydraulic lever connecting rod is fixedly connected to the output end of the second hydraulic cylinder. The pressure plate is rotatably connected to the other end of the hydraulic lever connecting rod. The hinge is rotatably connected to both the support rod and the pressure plate.

[0009] This utility model discloses a general-purpose crankshaft milling and centering fixture. The base provides a stable support platform for other components. The pusher, located above the base, provides power for the centering operation. Two symmetrically arranged lower pressure members ensure uniform and stable pressure on the workpiece, keeping it fixed during processing. The pressure plate is connected to the lower pressure members and directly acts on the workpiece for clamping. The fixture body, fixed to the base, is the core structure for installing and positioning other key components. The support unit is located on the outside of the fixture body, providing auxiliary support for the workpiece. The pin connecting sleeve transmits the power of the pusher to the pin. The pin locking block ensures a stable connection between the pin and the pin connecting sleeve. The pin is movably connected to the fixture body and can be used under the action of the pusher. The downward movement achieves the centering function. The centering block is movably set on the main body of the tooling and can be adjusted according to different workpiece sizes to ensure that the crank center is accurately located in the middle of the two plates. In use, the workpiece crankshaft is installed on the main body of the tooling, and the pushing component is activated. The pushing component pushes out the pin connecting sleeve and pushes the pin forward, so that the front conical surface of the pin presses against the two centering blocks. The two centering blocks separate to both sides within the main body of the tooling and respectively abut against the inner end face of the workpiece plate to achieve the centering purpose. Then, through the delay device, the pressing component is activated, and the pressing component moves the pressure plate down to press the workpiece. Finally, the starting component program is pressed to control the milling of the end face and drilling of the center hole. By using the above method, automatic centering can be achieved, ensuring that the crank center is in the middle of the two plates, improving machining accuracy and product quality. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of the general-purpose crankshaft milling center hole fixture of this utility model.

[0012] Figure 2 This is a schematic diagram of the structure of the general-purpose crankshaft milling center hole fixture for fixing the workpiece according to this utility model.

[0013] Figure 3 This is a top view of the structure of the general-purpose crankshaft milling center hole fixture of this utility model.

[0014] Figure 4 This is a front view of the structure of the general-purpose crankshaft milling center hole fixture of this utility model.

[0015] Figure 5 This is a side view of the structure of the general-purpose crankshaft milling center hole fixture of this utility model.

[0016] Figure 6 This is the utility model Figure 4 A cross-sectional view of the AA line structure.

[0017] 1-Pressure plate, 2-Support rod, 3-Hinge, 4-Hydraulic lever connecting rod, 5-Pad plate, 6-Second hydraulic cylinder, 7-First V-block, 8-Main fixture, 9-V-fixed plate, 10-Second V-block, 11-Pin connecting sleeve, 12-Pin locking block, 13-Pin, 14-Centering block, 15-Base, 16-Support, 17-First hydraulic cylinder, 18-Crankshaft. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] Please see Figures 1-6This utility model provides a milling fixture for a general-purpose crankshaft 18, comprising a base 15, a pushing member, two sets of pressing members, a tooling body 8, a pin 13, a pin locking block 12, a pin connecting sleeve 11, a support unit, two pressure plates 1, and two centering blocks 14. The pushing member is connected to the base 15 and is located above the fixed base 15. Both sets of pressing members are connected to the base 15 and are symmetrically arranged above the base 15. The two pressure plates 1 are respectively connected to the corresponding pressing members. The main body 8 is fixedly connected to the base 15 and located above the base 15. The support unit is disposed on the outside of the main body 8. The pin connecting sleeve 11 is fixedly connected to the pusher. One end of the pin locking block 12 is fixedly connected to the pin connecting sleeve 11. The pin 13 is fixedly connected to the other end of the pin locking block 12. The pin 13 is also movably connected to the main body 8. The two centering blocks 14 are movably disposed on the main body 8.

[0020] In this embodiment, the base 15 provides a stable support platform for other components. The pushing member is located above the base 15 and provides power for the centering operation. Two sets of symmetrically arranged pressing members ensure uniform and stable pressure on the workpiece, keeping it fixed during processing. The pressure plate 1 is connected to the pressing members and directly acts on the workpiece for clamping. The fixture body 8 is fixed on the base 15 and is the core structure for installing and positioning other key components. The support unit is located on the outside of the fixture body 8 and serves to assist in supporting the workpiece. The pin connecting sleeve 11 transmits the power of the pushing member to the pin 13. The pin locking block 12 ensures a stable connection between the pin 13 and the pin connecting sleeve 11. The pin 13 is movably connected to the fixture body 8 and can move under the action of the pushing member. To achieve the centering function, the centering block 14 is movably mounted on the tooling body 8 and can be adjusted according to different workpiece sizes to ensure that the crank center is accurately located in the middle of the two plates. In use, the workpiece crankshaft 18 is installed on the tooling body 8, and the pusher is activated. The pusher pushes out the pin connecting sleeve 11 and pushes the pin 13 forward, so that the front conical surface of the pin 13 presses against the two centering blocks 14. The two centering blocks 14 separate to both sides within the tooling body 8 and respectively abut against the inner end face of the workpiece plate to achieve the centering purpose. Then, through the delay device, the pressing member is activated, and the pressing member moves the pressure plate 1 down to press the workpiece. Finally, the starter program is pressed to control the milling of the end face and drilling of the center hole. By adopting the above method, automatic centering can be achieved, ensuring that the crank center is in the middle of the two plates, improving processing accuracy and product quality.

[0021] In addition, the fixture can be adjusted and changed. According to the opening size of the fan plate of different workpieces, the corresponding centering block 14 (the thickness of the centering block 14 is different) can be replaced. When replacing, first loosen the locking block 12, and then remove the pin 13 to replace the centering block 14.

[0022] Furthermore, the support unit includes a V-shaped fixing plate 9, a first V-shaped block 7, and a second V-shaped block 10. The V-shaped fixing plate 9 is fixedly connected to the tooling body 8 and is located on the outer side wall of the tooling body 8. The first V-shaped block 7 is fixedly connected to the tooling body 8 and is located on the outer side wall of the tooling body 8. The second V-shaped block 10 is fixedly connected to the V-shaped fixing plate 9 and is located on the outer side wall of the V-shaped fixing plate 9.

[0023] In this embodiment, the first V-block 7, the V-shaped fixing plate 9, and the second V-block 10 together constitute a support unit. The Y-shaped support design utilizes the geometric characteristics of the Y shape to provide support forces in multiple directions. The V-shaped fixing plate 9 serves as an intermediate connector, connecting the second V-block 10 to the tooling body 8, thereby expanding the support range. The first V-block 7 and the second V-block 10 cooperate with each other to form a stable support system. Based on the shape and size of the workpiece, the workpiece is supported from different positions to ensure that the workpiece remains stable during processing and to avoid deformation or vibration caused by uneven force.

[0024] In addition, the fixture is adjusted and the V-block height is adjusted: the height of the first V-block 7 and the second V-block 10 is adjusted according to the diameter of the contact point between the blank and the V-block to ensure that the machining center hole of the product is in the center (the V-block fastening screws can be loosened during adjustment); for special parts (crankshaft 18 with a particularly long output end and a total length greater than 300mm), the special thickened V-block fixing plate 9 needs to be replaced so that the Y-type support contact point moves outward, so that the part is securely clamped and does not shake when milling the total length.

[0025] Furthermore, the pushing member includes a support 16 and a first hydraulic cylinder 17. The support 16 is fixedly connected to the base 15 and is located above the base 15. The first hydraulic cylinder 17 is fixedly connected to the support 16 and is located above the support 16. The pin connecting sleeve 11 is fixedly connected to the output end of the first hydraulic cylinder 17.

[0026] In this embodiment, the support 16 is fixed above the base 15, providing a stable mounting foundation for the first hydraulic cylinder 17. The first hydraulic cylinder 17 serves as a power source, and its output end is fixedly connected to the pin connecting sleeve 11, accurately transmitting hydraulic power to the pin connecting sleeve 11, thereby driving the pin 13 to perform linear movement and realizing the centering operation.

[0027] Further, the pressing component includes a pad 5, a second hydraulic cylinder 6, a hydraulic lever connecting rod 4, a hinge 3, and a support rod 2. The second hydraulic cylinder 6 is fixedly connected to the base 15 and located above the base 15. The pad 5 is fixedly connected to the second hydraulic cylinder 6 and located above the second hydraulic cylinder 6. The support rod 2 is fixedly connected to the pad 5 and located above the pad 5. One end of the hydraulic lever connecting rod 4 is fixedly connected to the output end of the second hydraulic cylinder 6. The pressure plate 1 is rotatably connected to the other end of the hydraulic lever connecting rod 4. The hinge 3 is rotatably connected to the support rod 2 and the pressure plate 1 respectively.

[0028] In this embodiment, the second hydraulic cylinder 6 is fixed above the base 15, serving as the power source for downward pressing and generating sufficient pressure to clamp the workpiece. The support rod 2 is fixed on the pad 5, providing a stable support point for the pressure plate 1. The hydraulic lever connecting rod 4 transmits the power of the second hydraulic cylinder 6 to the pressure plate 1, enabling the pressure plate 1 to move downwards to clamp the workpiece. The hinge 3 is rotatably connected to the support rod 2 and the pressure plate 1, allowing the pressure plate 1 to be adjusted at a certain angle according to the shape of the workpiece when clamping it, ensuring full contact between the pressure plate 1 and the workpiece surface, improving the clamping effect, and ensuring that the workpiece does not loosen during processing.

[0029] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A jig for milling and drilling center holes in a general-purpose crankshaft, characterized in that, The fixture includes a base, a pusher, two sets of pressing members, a fixture body, a pin, a pin locking block, a pin connecting sleeve, a support unit, two pressure plates, and two centering blocks. The pusher is connected to the base and is located above the fixed base. Both sets of pressing members are connected to the base and are symmetrically arranged above the base. The two pressure plates are respectively connected to the corresponding pressing members. The fixture body is fixedly connected to the base and is located above the base. The support unit is located on the outside of the fixture body. The pin connecting sleeve is fixedly connected to the pusher. One end of the pin locking block is fixedly connected to the pin connecting sleeve, and the other end of the pin is fixedly connected to the pin locking block. The pin is also movably connected to the fixture body. The two centering blocks are movably arranged on the fixture body.

2. The milling fixture for center holes of a general-purpose crankshaft as described in claim 1, characterized in that, The support unit includes a V-shaped fixing plate, a first V-shaped block, and a second V-shaped block. The V-shaped fixing plate is fixedly connected to the tooling body and is located on the outer side wall of the tooling body. The first V-shaped block is fixedly connected to the tooling body and is located on the outer side wall of the tooling body. The second V-shaped block is fixedly connected to the V-shaped fixing plate and is located on the outer side wall of the V-shaped fixing plate.

3. The milling fixture for center holes of a general-purpose crankshaft as described in claim 2, characterized in that, The pushing component includes a support and a first hydraulic cylinder. The support is fixedly connected to the base and located above the base. The first hydraulic cylinder is fixedly connected to the support and located above the support. The pin connecting sleeve is fixedly connected to the output end of the first hydraulic cylinder.

4. The milling fixture for center holes of a general-purpose crankshaft as described in claim 3, characterized in that, The pressing component includes a pad, a second hydraulic cylinder, a hydraulic lever connecting rod, a hinge, and a support rod. The second hydraulic cylinder is fixedly connected to the base and located above the base. The pad is fixedly connected to the second hydraulic cylinder and located above the second hydraulic cylinder. The support rod is fixedly connected to the pad and located above the pad. One end of the hydraulic lever connecting rod is fixedly connected to the output end of the second hydraulic cylinder. The pressure plate is rotatably connected to the other end of the hydraulic lever connecting rod. The hinge is rotatably connected to both the support rod and the pressure plate.

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