Six-cylinder crankshaft connecting rod de-machining tooling

Abstract

A six-cylinder crankshaft connecting rod non-machining tool includes a base fixed on a machine tool workbench, the base is provided with a turnover assembly capable of reciprocating and turning between a horizontal position and an inclined position, the turnover assembly includes a turnable workbench and a hydraulic cylinder for driving the workbench to turn, the workbench is provided with a positioning and clamping assembly for fixing a crankshaft and an angular positioning assembly for quickly determining a connecting rod neck position during rotation of the crankshaft, and the crankshaft is provided with cutter positioning assemblies capable of turning by 180 DEG on both sides and suitable for cutter guiding and adapting to the connecting rod neck of the crankshaft. The angular positioning assembly can realize quick switching and positioning of three groups of connecting rod necks of the six-cylinder crankshaft, the turnover assembly can be quickly switched between the horizontal position and the inclined position conveniently and quickly, the structure can realize quick clamping and positioning during non-machining of both sides of the connecting rod of the crankshaft, machining efficiency and machining precision are improved, and the tool has high practical value and application prospect.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft machining technology, specifically a tooling for removing weight from the connecting rod of a six-cylinder crankshaft. Background Technology

[0002] As one of the core components of an engine, the crankshaft's performance directly affects the engine's overall operation. With the trend towards lighter engines, crankshafts are also being designed to be lightweight; for example, weight reduction designs on both sides of the connecting rods are a common weight-reduction method.

[0003] While modifying the design drawings for the weight removal on both sides of the crankshaft connecting rod during the design phase is relatively easy, numerous challenges arise during actual machining. Due to the complex structure of the six-cylinder crankshaft, with the six connecting rods having three sets of phase angles (0°, 120°, and 240°), and the irregular shapes of the weight removal areas on both sides of the connecting rods, it is difficult to achieve precise clamping and positioning quickly during machining. Unstable clamping can cause the crankshaft to wobble during machining, affecting machining accuracy, potentially damaging the cutting tools, or even causing safety accidents. Inaccurate positioning can lead to deviations in the weight removal machining position, failing to meet the design requirements for lightweighting and performance. These factors significantly increase the difficulty of weight removal machining on both sides of the crankshaft connecting rod, resulting in low machining efficiency and an inability to meet production demands. Utility Model Content

[0004] Based on the technical problems existing in the prior art, the purpose of this utility model is to propose a tooling for removing weight from a six-cylinder crankshaft connecting rod.

[0005] The technical solution adopted by this utility model is: a six-cylinder crankshaft connecting rod de-weighting machining fixture, including a base fixed on a machine tool worktable, the base being provided with a flipping assembly that can reciprocate between a horizontal position and an inclined position, the flipping assembly including a flippable worktable and a hydraulic cylinder for driving the worktable to flip, the worktable being provided with a positioning clamping assembly for fixing the crankshaft and an angular positioning assembly for quickly determining the position of the connecting rod journal during crankshaft rotation, and tool positioning assemblies that can be flipped 180° on both sides of the crankshaft and are used for tool guidance and adapted to the crankshaft connecting rod journal.

[0006] As a preferred embodiment, the base is further provided with a flipping limit block and a horizontal limit post, which are respectively set at both ends of the base. The bottom end of the hydraulic cylinder is hinged to the base, and the telescopic rod end of the hydraulic cylinder is hinged to the lower end of the worktable and on the same side as the flipping limit block.

[0007] As a preferred embodiment, there are two horizontal limiting posts, whose lower ends contact the horizontal limiting posts when the worktable is in a horizontal position, and two flip limiting blocks, whose lower ends contact the flip limiting blocks when the worktable is in an inclined position.

[0008] As a preferred embodiment, the positioning and clamping assembly includes V-shaped support blocks for supporting both ends of the crankshaft and slide rail clamping units for clamping both ends of the crankshaft.

[0009] As a preferred embodiment, the slide rail clamping unit includes a clamping bar, a first push rod, and a second push rod. The clamping bar is provided with a replaceable copper block, a U-shaped through groove, and a slide rail in sequence along its length. The lower ends of the first push rod and the second push rod are fixed on the worktable. The upper end of the first push rod is slidably connected to the slide rail. The upper end of the second push rod is provided with an external thread section, which passes through the U-shaped through groove and is exposed.

[0010] As a preferred embodiment, the outer side of the V-shaped support blocks at both ends of the crankshaft is provided with an axial positioning block that cooperates with the journal step.

[0011] As a preferred embodiment, a V-shaped support block for auxiliary support is provided below the main journal in the middle of the crankshaft.

[0012] As a preferred embodiment, the tool positioning assembly includes a support, a tilting arm, and a guide sleeve. The lower end of the support is fixed to the worktable. The tilting arm is adapted to the crankshaft connecting rod journal and can be tilted 180°. One end of the arm is hinged to the upper end of the support, and the other end is provided with a replaceable guide sleeve for guiding the tool.

[0013] As a preferred embodiment, the angular positioning assembly includes an angular positioning slider and two angular positioning seats. The angular positioning seats are mounted on the worktable and are provided with slide rails. The lower end of the angular positioning slider is provided with a slide groove that cooperates with the slide rail of the angular positioning seat. The angular positioning slider can cooperate with two angular positioning seats located at different positions to quickly position different connecting rod journals on the crankshaft to the machining position.

[0014] The beneficial effects of this utility model are: This invention, by employing a V-shaped support block, an axial positioning block, and a slide rail clamping unit, ensures the positioning accuracy and fixing stability of the crankshaft to be processed. It also enables rapid clamping and loosening of the crankshaft. The angular positioning component allows for rapid switching and positioning of the three sets of connecting rod journals on the six-cylinder crankshaft, while the flipping component allows for convenient and quick switching between horizontal and inclined positions. This structure enables rapid clamping and positioning during the de-lamination processing of both sides of the crankshaft connecting rod, improving processing efficiency and accuracy. It has high practical value and promising prospects for widespread application. Attached Figure Description

[0015] 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 this embodiment or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the horizontal position of the flipping component of this utility model; Figure 3 This is a schematic diagram showing the tilt position of the flipping component of this utility model; Figure 4 Schematic diagram of the slide rail clamping unit; Figure 5 This is a schematic diagram of the tool positioning assembly.

[0017] Reference numerals: 1. Base, 2. Tilting limit block, 3. V-shaped support block, 4. Slide rail clamping unit, 5. Crankshaft, 6. Tool positioning assembly, 7. Angular positioning assembly, 8. Horizontal limit post, 9. Hydraulic cylinder, 10. Worktable, 11. Axial positioning block, 12. Clamping bar, 13. First push rod, 14. Second push rod, 15. Support, 16. Tilting support arm, 17. Guide sleeve. Detailed Implementation

[0018] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may be advantageously incorporated into other embodiments.

[0019] To more clearly describe a tooling solution for removing weight from a six-cylinder crankshaft connecting rod, combined with the attached... Figure 1 - 5. Detailed description as follows: like Figure 1-5 As shown, a six-cylinder crankshaft connecting rod weight removal machining fixture includes a base 1, a flipping assembly, a positioning and clamping assembly, a tool positioning assembly 6, and an angular positioning assembly 7. The base 1 is fixed on the machine tool worktable and is made of high-strength cast iron material, which has good rigidity and stability and can withstand various forces during the machining process. The base 1 has four U-shaped grooves at each end and is fixed on the machine tool worktable by T-shaped screws to facilitate subsequent machining procedures.

[0020] In this embodiment, the flipping assembly is located on the upper end of the base 1 and includes a hydraulic cylinder 9 and a worktable 10. The bottom end of the hydraulic cylinder 9 is hinged to the upper end of the base 1, and the telescopic rod end of the hydraulic cylinder 9 is hinged to the lower end face of the worktable 10. The middle part of the base 1 is also provided with two support seats for supporting the worktable 10. The two support seats are rotatably connected to the worktable 10 through bearings, so that the worktable 10 can rotate to a certain extent.

[0021] In this embodiment, the upper end of the base 1 is also provided with a flipping limiting block 2 and a horizontal limiting post 8. There are two flipping limiting blocks 2, which are symmetrically arranged at one end of the base 1. One side of the flipping limiting block 2 is provided with an inclined surface with an angle of 65° with the horizontal plane. The horizontal limiting post 8 is arranged at one end of the base 1 away from the flipping limiting block 2. The height of the horizontal limiting post 8 is greater than the height of the flipping limiting block 2. There are two horizontal limiting posts 8. When the worktable 10 is in a horizontal position, its lower end face is in contact with the upper end of the horizontal limiting post 8. At this time, the horizontal limiting post 8 supports the worktable 10 and limits it. When the worktable 10 is flipped from the horizontal position to the inclined position under the drive of the hydraulic cylinder 9, the lower end face of the worktable 10 is in contact with the inclined surface of the flipping limiting block 2 to ensure that the worktable 10 is stably maintained in an inclined state.

[0022] Furthermore, the hinge point between the extension rod end of the hydraulic cylinder 9 and the lower end face of the worktable 10 is on the same side as the tilting limit block 2. When the extension rod of the hydraulic cylinder 9 extends, the worktable 10 rotates around the support seat as the axis until its lower end face contacts the upper end face of the horizontal limit post 8 to form a horizontal positioning. When the extension rod of the hydraulic cylinder 9 retracts, the worktable 10 rotates to fit against the inclined surface of the tilting limit block 2 to complete the tilting positioning. When the worktable 10 is in a horizontal position, it facilitates the fixing of the crankshaft 5. When it is in an inclined state, it facilitates the cutting tool to perform weight removal processing on the crankshaft 5. Through the coordinated cooperation of the hydraulic cylinder 9, the horizontal limit post 8, the tilting limit block 2, and the support seat, the worktable 10 can quickly and conveniently realize the reciprocating tilting between the horizontal material loading / unloading position and the inclined working position.

[0023] Furthermore, the lower end of the worktable 10 is provided with several protrusions that are adapted to the upper end of the horizontal limiting post 8 and the inclined surface of the flipping limiting block 2. When the worktable 10 is in a horizontal position, some of the protrusions are in contact with the upper end of the horizontal limiting post 8, and when it is in an inclined state, the other part of the protrusions are in contact with the inclined surface of the flipping limiting block 2.

[0024] Furthermore, a protective baffle is installed on the upper end of the base 1. The protective baffle is located on the side of the base 1. When the workbench 10 is switched from a horizontal position to an inclined position, the protective baffle can effectively protect the staff.

[0025] In this embodiment, the positioning and clamping assembly is set on the upper end of the worktable 10, including a V-shaped support block 3, a slide rail clamping unit 4, and an axial positioning block 11. The two V-shaped support blocks 3 are respectively fixed at both ends of the worktable 10 in the length direction. The two V-shaped support blocks 3 are used to support both ends of the crankshaft 5, so that the crankshaft 5 is placed stably on the worktable 10. The outer sides of the two V-shaped support blocks 3 are respectively provided with axial positioning blocks 11. The two axial positioning blocks 11 are respectively adapted to the journal steps at both ends of the crankshaft 5 and form surface contact, ensuring that the crankshaft 5 is accurately positioned and firmly fixed in the axial direction when in a horizontal or inclined position. Each side of both ends of the crankshaft 5 is provided with a slide rail clamping unit 4. The two slide rail clamping units 5 cooperate with the two V-shaped support blocks 3 to clamp and fix both ends of the crankshaft 5.

[0026] Furthermore, the slide rail clamping unit 5 consists of a clamping strip 12, a first push rod 13, and a second push rod 14. The clamping strip 12 is provided with a copper block, a U-shaped groove, and a slide rail in sequence along its length. The first push rod 13 is located on one side of the crankshaft 5 end, with its lower end fixed to the worktable 10 and its upper end slidingly engaged with the inner wall of the slide rail of the clamping strip 12. The second push rod 14 is located between the crankshaft 5 end and the first push rod 13, with its lower end fixed to the worktable 10 and its upper end provided with an external thread section. The external thread section of the second push rod 14 passes through the U-shaped groove of the clamping strip 12 and is partially exposed. The external thread section of the second push rod 14 is adapted to the U-shaped groove and can be slidably adjusted along the length of the U-shaped groove. The copper block is a replaceable component. After the end is placed on the V-shaped support block 3, adjust the slide rail clamping unit 4 to position the copper block part of the slide rail clamping unit 4 above the crankshaft 5 end. The external thread section of the second push rod 14 passes through the upper and lower ends of the U-shaped through groove and a part of it is exposed. At this time, tighten the matching nut on the external thread of the second push rod 14. Using the lever clamping principle, the copper block is firmly pressed on the crankshaft 5 end, thus fixing the crankshaft 5. When it is necessary to loosen the crankshaft 5, loosen the nut on the external thread of the second push rod 14 and slide the clamping strip 12 along the slide rail away from the crankshaft 5, so that the copper block leaves the crankshaft 5 end. At this time, the crankshaft 5 is released from the clamping state. The slide rail clamping unit 4 is simple to operate and can quickly achieve the clamping and loosening of the crankshaft 5, combining ease of operation and positioning reliability.

[0027] Furthermore, the upper end of the worktable 10 is provided with a V-shaped support block 3 for auxiliary support of the crankshaft 5. The V-shaped support block 3 is located below the main journal in the middle of the crankshaft 5 to prevent the crankshaft 5 from deforming during processing.

[0028] Furthermore, the contact surface between the V-shaped support block 3 and the crankshaft 5 of the axial positioning block 11 is made of hardened carbide block, which ensures wear resistance while maintaining the integrity of the journal surface.

[0029] In this embodiment, a six-cylinder crankshaft is used as an example: the six-cylinder crankshaft has six connecting rod journals to be processed, which are sequentially arranged from one end of the crankshaft 5 as the first connecting rod journal, the second connecting rod journal, the third connecting rod journal, the fourth connecting rod journal, the fifth connecting rod journal, and the sixth connecting rod journal. The angular positioning assembly 7 includes an angular positioning slider and two angular positioning seats. The two angular positioning seats are respectively located below the first connecting rod journal and the fifth connecting rod journal. The angular positioning seats are provided with slide rails. The lower end of the angular positioning slider is provided with a slide groove that cooperates with the slide rail on the angular positioning seat. The angular positioning slider can be slidably connected to the two angular positioning seats respectively. With the cooperation of the angular positioning slider and the two angular positioning seats, the connecting rod journals to be processed can be quickly and accurately moved to the target processing position.

[0030] In this embodiment, the tool positioning assembly 6 includes a support 15, a flipping arm 16, and a guide sleeve 17. The lower end of the support 15 is fixed to the upper surface of the worktable 10, and the top end is hinged to one end of the flipping arm 16. The flipping arm 16 can be flipped 180°. The flipping arm 15 can be flipped to face the connecting rod neck and adapted to the connecting rod neck to be processed. The other end of the flipping arm 15 is provided with a replaceable guide sleeve 17, which is used to provide guidance and positioning for the machine tool tool. When one end of the guide sleeve 17 of the flipping arm 15 is flipped to face the connecting rod neck to be processed, the guide sleeve 17 provides guidance and positioning for the tool so as to perform de-weighting processing on the connecting rod neck.

[0031] Furthermore, since the design requires the angle between the weight removal hole and the workpiece axis to be 65°, when the worktable 10 is flipped to the inclined processing position, the angle of the inclined surface of the flipping limit block 2 is 65°. At this time, the upper and lower ports of the guide sleeve 17 of the tool positioning assembly 6 are both kept in a horizontal state, that is, the channel in the guide sleeve 17 is kept perpendicular to the base 1, so that the tool can easily cut in the vertical direction, effectively reducing the difficulty of operation and improving work efficiency.

[0032] Furthermore, the guide sleeve 17 of the tool positioning assembly 6 is made of quenched high carbon steel, which has high wear resistance and positioning accuracy. The inner diameter of the guide sleeve 17 matches the outer diameter of the machining tool, which can ensure the precise positioning of the tool.

[0033] Furthermore, there are a total of six sets of the tool positioning components 6, with three sets on each side of the crankshaft 5 to be processed along its length. The six sets of tool positioning components 6 correspond one-to-one with the six connecting rod journals of the crankshaft 5 to be processed, ensuring accurate machining of the de-weighting holes on each connecting rod journal.

[0034] The process of removing weight from the six-cylinder crankshaft using the above-mentioned tooling is as follows: First, flip the worktable to a horizontal position. Then, place the crankshaft on the V-shaped support block of the worktable, ensuring that the end faces of the journal steps at both ends of the crankshaft are in contact with the axial positioning block. Install the angular positioning slider on the angular positioning seat located below the fifth connecting rod journal. Rotate the crankshaft so that the angular positioning slider is positioned below the fifth connecting rod journal to complete the positioning. At this time, the angular positioning slider restricts the crankshaft from continuing to rotate. The first and sixth connecting rod journals to be machined should be in the machining position. Manually push the clamping bar with the slide rail to move the copper block above both ends of the crankshaft. Tighten the nut on the second push rod to clamp the crankshaft. Then, flip the flipping arm of the tool positioning assembly to the machining position suitable for the crankshaft. Start the flipping assembly. After the worktable with the crankshaft fixed is flipped to the inclined machining position, operate the machine tool to drill the de-weighting holes of the first and sixth connecting rod journals according to the guide sleeve positioning.

[0035] After drilling the two de-weighting holes, activate the tilting assembly to tilt the worktable to a horizontal position, release the slide rail clamping unit, remove the angular positioning slider from the angular positioning seat below the fifth connecting rod neck, and install it in a suitable position on the angular positioning seat below the first connecting rod neck. Rotate the crankshaft to position the angular positioning slider below the first connecting rod neck to complete the positioning, so that the corresponding second and fifth connecting rod necks (or third and fourth connecting rod necks) to be processed are in the processing position. Then perform the following steps: clamp the crankshaft, activate the tilting assembly to the inclined processing position, operate the machine tool to position the second and fifth connecting rod necks (or third and fourth connecting rod necks) according to the guide sleeve to drill de-weighting holes, and then repeat the above steps to drill de-weighting holes in the second and fifth connecting rod necks (or third and fourth connecting rod necks) until all six de-weighting holes are processed.

[0036] After the six de-weighting holes are machined, the flipping assembly is activated to flip the worktable to a horizontal position, the slide rail clamping unit is released, the crankshaft is turned around using the hanger, the crankshaft is re-mounted, and the six de-weighting holes on the other side of the connecting rod journal are machined according to the machining process of the six de-weighting holes mentioned above. Finally, the machining of twelve de-weighting holes is completed, and the de-weighting work of the crankshaft is finished.

[0037] The parts not described in detail in this embodiment are existing technologies.

[0038] It should be noted that although the present invention has been described through the above embodiments, the present invention may have other various embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but these changes and modifications should all fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A tooling for removing weight from a six-cylinder crankshaft connecting rod, comprising a base (1) fixed on a machine tool worktable, characterized in that: The base (1) is provided with a flipping assembly that can reciprocate between a horizontal position and an inclined position. The flipping assembly includes a flippable worktable (10) and a hydraulic cylinder (9) for driving the worktable (10) to flip. The worktable (10) is provided with a positioning clamping assembly for fixing the crankshaft (5) and an angular positioning assembly (7) for quickly determining the position of the connecting rod journal during the rotation of the crankshaft (5). On both sides of the crankshaft (5), there are tool positioning assemblies that can be flipped 180° and are used for tool guidance and adapted to the connecting rod journal of the crankshaft (5).

2. The six cylinder crankshaft connecting rod de-burring fixture of claim 1 wherein: The base (1) is also provided with a flipping limit block (2) and a horizontal limit post (8). The flipping limit block (2) and the horizontal limit post (8) are respectively set at both ends of the base (1). The bottom end of the hydraulic cylinder (9) is hinged on the base (1). The telescopic rod end of the hydraulic cylinder (9) is hinged to the lower end of the worktable (10) and is on the same side as the flipping limit block (2).

3. The six cylinder crankshaft connecting rod de-burring fixture of claim 2 wherein: The horizontal limiting post (8) consists of two posts. When the worktable (10) is in a horizontal position, its lower end contacts the horizontal limiting post (8). The flip limiting block (2) consists of two blocks. When the worktable (10) is in an inclined position, its lower end contacts the flip limiting block (2).

4. The six cylinder crankshaft connecting rod de-burring fixture of claim 1 wherein: The positioning and clamping assembly includes V-shaped support blocks (3) for supporting both ends of the crankshaft and slide rail clamping units (4) for clamping both ends of the crankshaft.

5. The six cylinder crankshaft connecting rod de-burring fixture of claim 4 wherein: The slide rail clamping unit (4) includes a clamping bar (12), a first push rod (13), and a second push rod (14). The clamping bar (12) is provided with a replaceable copper block, a U-shaped through groove, and a slide rail in sequence along its length. The lower ends of the first push rod (13) and the second push rod (14) are fixed on the worktable (10). The upper end of the first push rod (13) is slidably connected to the slide rail. The upper end of the second push rod (14) is provided with an external thread section, which passes through the U-shaped through groove and is exposed.

6. The six cylinder crankshaft connecting rod de-burring fixture of claim 4 wherein: The crankshaft (5) has V-shaped support blocks (3) at both ends with axial positioning blocks (11) that cooperate with the journal steps on the outside.

7. The six cylinder crankshaft connecting rod de-burring fixture of claim 4 wherein: A V-shaped support block (3) is provided below the main journal in the middle of the crankshaft (5) for auxiliary support.

8. The six cylinder crankshaft connecting rod de-burring fixture of claim 1 wherein: The tool positioning assembly (6) includes a support (15), a tilting arm (16), and a guide sleeve (17). The lower end of the support (15) is fixed on the worktable (10). The tilting arm (16) is adapted to the connecting rod journal of the crankshaft (5) and can be tilted 180°. One end of the arm is hinged to the upper end of the support (15), and the other end is provided with a replaceable guide sleeve (17) for guiding the tool.

9. The six cylinder crankshaft connecting rod de-burring fixture of claim 1 wherein: The angular positioning assembly (7) includes an angular positioning slider and two angular positioning seats. The angular positioning seats are mounted on the workbench and are provided with slide rails. The lower end of the angular positioning slider is provided with a slide groove that cooperates with the slide rail of the angular positioning seat. The angular positioning slider can cooperate with two angular positioning seats located at different positions to quickly position different connecting rod journals on the crankshaft (5) to the machining position.

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