A crankshaft oil hole EDM positioning tooling

Abstract

This utility model relates to a crankshaft oil hole EDM positioning tooling, belonging to the field of crankshaft machining and manufacturing. It includes: a base mechanism, a sliding displacement mechanism, a length adjustment mechanism, and a supporting reinforcing rod. The sliding displacement mechanism is slidably mounted on the base mechanism, and the length adjustment mechanism is vertically fixed at its top end. The supporting reinforcing rod is inclined, with its two ends corresponding to the top end of the sliding displacement mechanism and the side wall of the length adjustment mechanism, respectively. This utility model facilitates adjusting the crankshaft's posture when tilted on the base mechanism and length adjustment mechanism, thereby aligning the inclined oil hole on the crankshaft connecting rod journal with the electrode of the EDM machine in the same vertical direction, making it convenient to remove taps or drill bits broken in the crankshaft oil hole using EDM.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft machining and manufacturing, and in particular to a crankshaft oil hole EDM positioning tooling. Background Technology

[0002] In the machining of large crankshafts, drill bit breakage in oil holes is an extremely common and troublesome technical problem, directly affecting machining efficiency, cost, quality, and even equipment safety. The core issue of drill bit breakage in the machining of oil holes for large crankshafts lies in the combined effect of deep holes, angled holes, and difficult-to-machine materials, resulting in a severe imbalance of drilling forces, extremely difficult chip removal, difficulty in ensuring cooling and lubrication, and the drill bit being subjected to huge bending / torsional stress and thermal stress.

[0003] Conventional methods for removing broken taps and drill bits embedded in tools include manual chipping, breaking them, gas welding followed by unscrewing, and even acid etching or flame cutting. However, these methods are often ineffective and can damage the workpiece. Furthermore, large crankshafts differ from small crankshafts, especially those with angled oil holes, which are small and deep, making conventional methods ineffective for removing broken drill bits. Therefore, electrical discharge machining (EDM) can be used to remove broken drill bits or taps from workpieces. EDM is a method that uses pulsed discharge to efficiently machine various types of steel, iron, and cemented carbide. When using electrical discharge machining (EDM) to remove taps or drill bits from crankshaft oil holes, it is essential to ensure that the EDM electrode and the oil hole on the crankshaft are in the same vertical direction. However, the angles of the inclined oil holes on the crankshaft connecting rod journals vary, making it extremely inconvenient to position the complex angled oil holes on large crankshafts each time. This not only requires lifting the large crankshaft and repeatedly adjusting the angle, resulting in high workload, but also poses serious safety hazards during the lifting process due to the large crankshaft being suspended in the air. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a crankshaft oil hole EDM positioning tooling to solve the above-mentioned problem.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A crankshaft oil hole EDM positioning tooling includes: a base mechanism, a sliding displacement mechanism, a length adjustment mechanism and a support reinforcing rod. The sliding displacement mechanism is slidably mounted on the base mechanism. The length adjustment mechanism is vertically fixed at the top of the sliding displacement mechanism. The support reinforcing rod is inclined and its two ends are fixedly connected to the top of the sliding displacement mechanism and the side wall of the length adjustment mechanism, respectively.

[0006] The beneficial effects of this utility model are: the sliding displacement mechanism is conducive to adjusting the position of the length adjustment mechanism on the base mechanism, and at the same time, in conjunction with the different lengths that the length adjustment mechanism can adjust, thereby adjusting the posture of the crankshaft that is tilted on the base mechanism and the length adjustment mechanism, so that the inclined oil hole on the crankshaft connecting rod journal is in the same vertical direction as the electrode of the EDM machine, which makes it convenient to use EDM to remove the tap or drill bit broken in the crankshaft oil hole. In addition, the supporting reinforcing rod helps to improve the strength of the tooling when the crankshaft is tilted on the base mechanism and the length adjustment mechanism, and avoids the sliding displacement mechanism from sliding on the base mechanism or the length adjustment mechanism from tipping over due to the excessive weight of the crankshaft, thus enhancing the safety factor.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the base mechanism includes: two displacement bases, an I-beam, a crankshaft lower limit block, and two limit side plates. The two limit side plates are fixedly disposed at both ends of the I-beam, the two displacement bases are fixedly disposed at both sides of the bottom end of the I-beam, the crankshaft lower limit block is fixedly disposed at the top end of the I-beam, and the sliding displacement mechanism is slidably mounted on the I-beam.

[0009] The beneficial effects of adopting the above-mentioned further solutions are: the displacement base is conducive to driving the entire tooling to a suitable processing position; the limiting side plate is conducive to limiting the sliding position of the sliding displacement mechanism on the I-beam, preventing the sliding displacement mechanism from sliding out of the I-beam; and the crankshaft lower limiting block is conducive to providing support for the end of the crankshaft, ensuring the stability of the crankshaft on the tooling.

[0010] Furthermore, the displacement base includes at least two omnidirectional wheels capable of braking and a support base plate. The omnidirectional wheels are rotatably mounted on the bottom end of the support base plate, and the I-beam is fixed to the top end of the support base plate.

[0011] The beneficial effects of adopting the above-mentioned further solution are: the casters facilitate the movement of the entire tooling to a suitable processing position, and the various components of the tooling are connected to form a whole through the support base plate.

[0012] Furthermore, the crankshaft lower limiting block is a block structure with a U-shaped groove at the top.

[0013] The beneficial effect of adopting the above-mentioned further solution is that the top of the crankshaft lower limit block is provided with a U-shaped groove, which is conducive to matching with one end of the crankshaft, thereby ensuring the stability of the crankshaft when it is placed on the tooling.

[0014] Furthermore, the sliding displacement mechanism includes two sliding components and a connecting plate. The connecting plate is fixedly mounted on the top of the two sliding components. The two sliding components are spaced apart and slidably mounted on the I-beam. The bottom end of the supporting reinforcing rod is fixedly connected to the top end of the connecting plate.

[0015] The beneficial effects of adopting the above-mentioned further solution are: the connecting plate is fixed at the top of the two sliding components, the two sliding components are spaced apart and slidably installed on the I-beam, which helps to fix the distance between the two sliding components and avoid the distance between the two sliding components changing during the sliding process of the sliding components on the I-beam, thereby avoiding the crankshaft tilting or even falling.

[0016] Furthermore, the sliding assembly includes: a sliding plate, two second locking adjustment members, two lower rolling limit members, and an upper rolling limit member. The sliding plate is an inverted U-shaped plate structure. The connecting plate is fixed to the top of the sliding plate. The second locking adjustment members, the lower rolling limit members, and the upper rolling limit members are fixed inside the sliding plate from bottom to top. The two second locking adjustment members are correspondingly arranged on both sides of the vertical plate of the I-shaped steel. The second locking adjustment members abut against or separate from the side wall of the vertical plate of the I-shaped steel. The two lower rolling limit members are correspondingly arranged on both sides of the vertical plate of the I-shaped steel. The lower rolling limit members roll in cooperation with the bottom end of the upper horizontal plate of the I-shaped steel, and the upper rolling limit members roll in cooperation with the top end of the upper horizontal plate of the I-shaped steel.

[0017] The beneficial effects of adopting the above-mentioned further solution are: the second locking adjustment component abuts against or separates from the side wall of the vertical plate of the I-shaped steel, which is conducive to realizing the fixing and sliding adjustment of the sliding component on the I-shaped steel; the lower rolling limit component rolls with the bottom end of the upper horizontal plate of the I-shaped steel, and the upper rolling limit component rolls with the top end of the upper horizontal plate of the I-shaped steel, which is conducive to providing limit and guidance for the displacement of the sliding component along the length direction of the I-shaped steel, and improving the stability of the sliding component when sliding on the I-shaped steel.

[0018] Furthermore, the lower rolling limiting component includes a lower roller and a lower fixing rod. One end of the lower fixing rod is fixed to the inner wall of the sliding plate, and the lower roller is rotatably fixed to the other end of the lower fixing rod. The lower roller rolls in cooperation with the bottom end of the upper horizontal plate of the I-shaped steel.

[0019] The beneficial effects of adopting the above-mentioned further solution are: the lower fixing rod helps to fix the lower roller on the inner wall of the sliding plate, and at the same time, the lower roller rolls in cooperation with the bottom end of the horizontal plate on the I-shaped steel. The upper rolling limiter helps to limit and guide the displacement of the sliding assembly along the length of the I-shaped steel, thereby improving the stability of the sliding assembly when sliding on the I-shaped steel.

[0020] Furthermore, the upper rolling limiting component includes an upper rolling rod and two upper fixing blocks. The two upper fixing blocks are fixedly mounted on the inner walls of both sides of the sliding plate. The upper rolling rod is rotatably disposed between the two upper fixing blocks. The upper rolling rod rolls with the top end of the upper horizontal plate of the I-shaped steel. The two upper fixing blocks are disposed on both sides of the upper horizontal plate of the I-shaped steel.

[0021] The beneficial effects of adopting the above-mentioned further solution are: the two upper fixing blocks are set one-to-one on both sides of the upper horizontal plate of the I-shaped steel, and the upper rolling rod rolls with the top of the upper horizontal plate of the I-shaped steel, which is conducive to cooperating with the lower rolling limiter to provide limit and guide for the displacement of the sliding component along the length direction of the I-shaped steel, thereby improving the stability of the sliding component when sliding on the I-shaped steel.

[0022] Furthermore, the length adjustment mechanism includes: an outer adjusting cylinder, an inner adjusting rod, and a crankshaft upper limit block. The outer adjusting cylinder is vertically fixed at the top of the sliding displacement mechanism. The inner adjusting rod can move up and down and is locked inside the outer adjusting cylinder. The crankshaft upper limit block is a block structure with a U-shaped groove at the top. The crankshaft upper limit block is fixed at the top of the inner adjusting rod. The top of the supporting reinforcing rod is fixedly connected to the upper side wall of the outer adjusting cylinder.

[0023] The beneficial effects of adopting the above-mentioned further solution are: the inner adjusting rod can be moved up and down inside the outer adjusting cylinder, which is conducive to adjusting the height of the length adjusting mechanism, thereby adjusting the attitude of the crankshaft; the top of the crankshaft upper limit block is provided with a U-shaped groove, which is conducive to matching with the other end of the crankshaft, thereby ensuring the stability of the crankshaft when placed on the tooling.

[0024] Furthermore, the length adjustment mechanism also includes a first locking adjustment member. Two adjustment holes are symmetrically arranged along the axial direction on the side wall of the outer adjustment cylinder. The adjustment holes are vertically arranged strip-shaped through holes. Multiple sets of locking holes are axially spaced on the side wall of the inner adjustment rod. Each set of locking holes is a through hole symmetrically arranged along the axial direction. The first locking adjustment member passes through the locking holes and the adjustment holes to fix the inner adjustment rod to the outer adjustment cylinder.

[0025] The beneficial effect of adopting the above-mentioned further solution is that the first locking adjustment component, in conjunction with the locking hole and the adjustment hole, facilitates the fixed connection of the inner adjusting rod and the outer adjusting cylinder after the height has been adjusted, thereby ensuring the stability of the crankshaft when it is placed on the tooling. Attached Figure Description

[0026] Figure 1 A front view of the overall structure of the crankshaft when it is placed on the tooling, as provided in an embodiment of this utility model;

[0027] Figure 2A side view of the overall structure provided for an embodiment of this utility model;

[0028] Figure 3 A front view of the base mechanism provided in an embodiment of this utility model;

[0029] Figure 4 A side view of the base mechanism provided in an embodiment of this utility model;

[0030] Figure 5 This is a front view of the sliding displacement mechanism provided in an embodiment of the present utility model;

[0031] Figure 6 A side view of the connection between the sliding displacement mechanism and the I-beam provided in an embodiment of this utility model.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Base mechanism; 2. Sliding displacement mechanism; 3. Length adjustment mechanism; 4. Support reinforcing rod; 11. Displacement base; 12. I-beam; 13. Crankshaft lower limit block; 14. Limiting side plate; 21. Sliding assembly; 22. Connecting plate; 31. Outer adjusting cylinder; 32. Inner adjusting rod; 33. Crankshaft upper limit block; 34. First locking adjusting component; 111. Universal wheel; 112. Support base plate; 211. Sliding plate; 212. Second locking adjusting component; 213. Lower rolling limit component; 214. Upper rolling limit component; 311. Adjusting hole; 2131. Lower roller; 2132. Lower fixed rod; 2141. Upper rolling rod; 2142. Upper fixed block. Detailed Implementation

[0034] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0035] like Figures 1 to 6 As shown, this embodiment provides a crankshaft oil hole EDM positioning tooling, including: a base mechanism 1, a sliding displacement mechanism 2, a length adjustment mechanism 3, and a support reinforcing rod 4. The sliding displacement mechanism 2 is slidably mounted on the base mechanism 1. The length adjustment mechanism 3 is vertically fixed at the top of the sliding displacement mechanism 2. The support reinforcing rod 4 is inclined and its two ends are fixedly connected to the top of the sliding displacement mechanism 2 and the side wall of the length adjustment mechanism 3, respectively.

[0036] It should be noted that in this embodiment, the two ends of the crankshaft are respectively fitted onto the lower crankshaft limiting block 13 in the base mechanism 1 and the upper crankshaft limiting block 33 in the length adjustment mechanism 3. At this time, the crankshaft is in an inclined state, as shown below. Figure 1 As shown;

[0037] To further ensure the safety of the machining process and prevent the crankshaft from falling, multiple slings are used to cover the crankshaft throughout the machining process, and these slings are connected to the overhead crane for secondary protection. However, it should be noted that the weight of the crankshaft during machining is borne by the lower crankshaft limit block 13 and the upper crankshaft limit block 33. The slings are only placed on the crankshaft and do not bear the weight of the crankshaft. The slings only bear the weight of the crankshaft when the crankshaft tilts or falls.

[0038] The beneficial effects of this utility model are: the sliding displacement mechanism is conducive to adjusting the position of the length adjustment mechanism on the base mechanism, and at the same time, in conjunction with the different lengths that the length adjustment mechanism can adjust, thereby adjusting the posture of the crankshaft that is tilted on the base mechanism and the length adjustment mechanism, so that the inclined oil hole on the crankshaft connecting rod journal is in the same vertical direction as the electrode of the EDM machine, which makes it convenient to use EDM to remove the tap or drill bit broken in the crankshaft oil hole. In addition, the supporting reinforcing rod helps to improve the strength of the tooling when the crankshaft is tilted on the base mechanism and the length adjustment mechanism, and avoids the sliding displacement mechanism from sliding on the base mechanism or the length adjustment mechanism from tipping over due to the excessive weight of the crankshaft, thus enhancing the safety factor.

[0039] Preferred, such as Figures 2 to 4 As shown, the base mechanism 1 includes: two displacement bases 11, an I-beam 12, a crankshaft lower limit block 13, and two limit side plates 14. The two limit side plates 14 are fixedly disposed at both ends of the I-beam 12, the two displacement bases 11 are fixedly disposed at both sides of the bottom end of the I-beam 12, the crankshaft lower limit block 13 is fixedly disposed at the top end of the I-beam 12, and the sliding displacement mechanism 2 is slidably mounted on the I-beam 12.

[0040] The advantages of adopting the above preferred solution are: the displacement base is conducive to driving the entire tooling to a suitable processing position; the limiting side plate is conducive to limiting the sliding position of the sliding displacement mechanism on the I-beam, preventing the sliding displacement mechanism from sliding out of the I-beam; and the crankshaft lower limiting block is conducive to providing support for the end of the crankshaft, ensuring the stability of the crankshaft on the tooling.

[0041] Preferred, such as Figures 2 to 4 As shown, the displacement base 11 includes at least two universal wheels 111 that can be braked and a support base plate 112. The universal wheels 111 are rotatably mounted on the bottom end of the support base plate 112, and the I-beam 12 is fixed to the top end of the support base plate 112.

[0042] It should be noted that in this embodiment, the universal wheel 111 can directly adopt a universal wheel with a braking function to achieve the braking function, which is existing technology.

[0043] The advantages of adopting the above preferred solution are: the casters facilitate the movement of the entire tooling to a suitable processing position, and the various components of the tooling are connected to form a whole through the support base plate.

[0044] Preferred, such as Figure 2 and Figure 4 As shown, the crankshaft lower limiting block 13 is a block structure with a U-shaped groove at the top.

[0045] The advantages of adopting the above preferred solution are: the top of the crankshaft lower limit block is provided with a U-shaped groove, which is conducive to matching with one end of the crankshaft, thereby ensuring the stability of the crankshaft when it is placed on the tooling.

[0046] Preferred, such as Figure 5 and Figure 6 As shown, the sliding displacement mechanism 2 includes two sliding components 21 and a connecting plate 22. The connecting plate 22 is fixedly mounted on the top of the two sliding components 21. The two sliding components 21 are spaced apart and slidably mounted on the I-beam 12. The bottom end of the supporting reinforcing rod 4 is fixedly connected to the top end of the connecting plate 22.

[0047] The advantages of adopting the above preferred solution are: the connecting plate is fixed at the top of the two sliding components, the two sliding components are spaced apart and slidably mounted on the I-beam, which helps to fix the distance between the two sliding components and avoid the distance between the two sliding components changing during the sliding process of the sliding components on the I-beam, thereby avoiding the crankshaft tilting or even falling.

[0048] Preferred, such as Figure 5 and Figure 6 As shown, the sliding assembly 21 includes: a sliding plate 211, two second locking adjustment members 212, two lower rolling limit members 213, and an upper rolling limit member 214. The sliding plate 211 is an inverted U-shaped plate structure. The connecting plate 22 is fixed to the top of the sliding plate 211. The second locking adjustment members 212, the lower rolling limit members 213, and the upper rolling limit members 214 are fixed inside the sliding plate 211 from bottom to top. The two second locking adjustment members 212 are correspondingly arranged on both sides of the vertical plate of the I-shaped steel 12. The second locking adjustment members 212 abut against or separate from the side wall of the vertical plate of the I-shaped steel 12. The two lower rolling limit members 213 are correspondingly arranged on both sides of the vertical plate of the I-shaped steel 12. The lower rolling limit members 213 roll with the bottom end of the upper horizontal plate of the I-shaped steel 12, and the upper rolling limit members 214 roll with the top end of the upper horizontal plate of the I-shaped steel 12.

[0049] It should be noted that in this embodiment, the I-beam 12 includes a vertical plate, an upper horizontal plate, and a lower horizontal plate. The upper horizontal plate and the lower horizontal plate are horizontally fixedly installed at the top and bottom of the vertical plate, respectively, and the lower horizontal plate is fixedly installed at the top of the supporting base plate 112.

[0050] The second locking adjustment member 212 is a bolt or screw. When the second locking adjustment member 212 abuts against the side wall of the vertical plate of the I-shaped steel 12, the sliding component 21 is fixed on the I-shaped steel 12. When the second locking adjustment member 212 is separated from the side wall of the vertical plate of the I-shaped steel 12, the sliding component 21 can slide on the I-shaped steel 12.

[0051] The advantages of adopting the above preferred solution are: the second locking adjustment component abuts against or separates from the side wall of the vertical plate of the I-shaped steel, which is conducive to the fixing and sliding adjustment of the sliding component on the I-shaped steel; the lower rolling limit component rolls with the bottom end of the upper horizontal plate of the I-shaped steel, and the upper rolling limit component rolls with the top end of the upper horizontal plate of the I-shaped steel, which is conducive to providing limit and guidance for the displacement of the sliding component along the length direction of the I-shaped steel, and improving the stability of the sliding component when sliding on the I-shaped steel.

[0052] Preferred, such as Figure 5 and Figure 6 As shown, the lower rolling limiting member 213 includes a lower roller 2131 and a lower fixing rod 2132. One end of the lower fixing rod 2132 is fixed on the inner wall of the sliding plate 211, and the lower roller 2131 is rotatably fixed on the other end of the lower fixing rod 2132. The lower roller 2131 rolls with the bottom end of the horizontal plate on the I-beam 12.

[0053] The advantages of adopting the above preferred solution are: the lower fixing rod helps to fix the lower roller on the inner wall of the sliding plate, and at the same time, the lower roller rolls in cooperation with the bottom end of the horizontal plate on the I-shaped steel. The upper rolling limiter helps to limit and guide the displacement of the sliding assembly along the length of the I-shaped steel, thereby improving the stability of the sliding assembly when sliding on the I-shaped steel.

[0054] Preferred, such as Figure 5 and Figure 6 As shown, the upper rolling limiting member 214 includes an upper rolling rod 2141 and two upper fixing blocks 2142. The two upper fixing blocks 2142 are fixedly mounted on the inner walls of both sides of the sliding plate 211. The upper rolling rod 2141 is rotatably disposed between the two upper fixing blocks 2142. The upper rolling rod 2141 rolls with the top end of the upper horizontal plate of the I-shaped steel 12. The two upper fixing blocks 2142 are disposed on both sides of the upper horizontal plate of the I-shaped steel 12.

[0055] The advantages of adopting the above preferred solution are: the two upper fixing blocks are set on both sides of the upper horizontal plate of the I-shaped steel, and the upper rolling rod rolls with the top of the upper horizontal plate of the I-shaped steel, which is conducive to cooperating with the lower rolling limiter to provide limit and guide for the displacement of the sliding component along the length direction of the I-shaped steel, thereby improving the stability of the sliding component when sliding on the I-shaped steel.

[0056] Preferred, such as Figure 1 and Figure 2 As shown, the length adjustment mechanism 3 includes: an outer adjustment cylinder 31, an inner adjustment rod 32, and a crankshaft upper limit block 33. The outer adjustment cylinder 31 is vertically fixed at the top of the sliding displacement mechanism 2. The inner adjustment rod 32 can move up and down and is locked inside the outer adjustment cylinder 31. The crankshaft upper limit block 33 is a block structure with a U-shaped groove at the top. The crankshaft upper limit block 33 is fixed at the top of the inner adjustment rod 32. The top of the supporting reinforcing rod 4 is fixedly connected to the upper side wall of the outer adjustment cylinder 31.

[0057] It should be noted that in this embodiment, the outer adjusting cylinder 31 is vertically fixed at the top of the connecting plate 22.

[0058] The advantages of adopting the above preferred solution are: the inner adjusting rod can be moved up and down inside the outer adjusting cylinder, which is conducive to adjusting the height of the length adjusting mechanism, thereby adjusting the attitude of the crankshaft; the top of the crankshaft upper limit block is provided with a U-shaped groove, which is conducive to matching with the other end of the crankshaft, thereby ensuring the stability of the crankshaft when placed on the tooling.

[0059] Preferred, such as Figure 1 and Figure 2 As shown, the length adjustment mechanism 3 further includes a first locking adjustment member 34. Two adjustment holes 311 are symmetrically arranged along the axial direction on the side wall of the outer adjustment cylinder 31. The adjustment holes 311 are vertically arranged strip-shaped through holes. Multiple sets of locking holes are axially spaced on the side wall of the inner adjustment rod 32. Each set of locking holes is a through hole symmetrically arranged along the axial direction. The first locking adjustment member 34 passes through the locking holes and the adjustment holes 311 to fix the inner adjustment rod 32 to the outer adjustment cylinder 31.

[0060] It should be noted that in this embodiment, the first locking adjustment member 34 is a bolt and a nut. The bolt passes through the locking hole and the adjustment hole 311 and is threadedly connected to the nut, thereby fixing the inner adjustment rod 32, which has been adjusted in height, to the outer adjustment cylinder 31.

[0061] The advantages of adopting the above preferred solution are: the first locking adjustment component, in conjunction with the locking hole and the adjustment hole, facilitates the fixed connection of the inner adjusting rod and the outer adjusting cylinder after the height has been adjusted, thereby ensuring the stability of the crankshaft when it is placed on the tooling.

[0062] The working process of this embodiment is described below:

[0063] like Figures 1 to 6 As shown, before hoisting a large crankshaft, it is necessary to ensure that the tooling is in the work area and that all casters 111 are in the braked state.

[0064] First, slide the sliding component 21 on the I-beam 12 to the approximate position, and tighten the second locking adjustment component 212 to fix the sliding displacement mechanism 2 on the I-beam 12;

[0065] Then, the inner adjusting rod 32 is adjusted up and down inside the outer adjusting cylinder 31 to the approximate position, and the height of the length adjusting mechanism 3 is fixed by the first locking adjusting member 34;

[0066] Then slowly place the crankshaft on the fixture, that is, place the two ends of the crankshaft one by one into the grooves on the lower limit block 13 and the upper limit block 33 of the crankshaft;

[0067] Next, check whether the inclined oil hole on the crankshaft connecting rod journal and the electrode of the EDM machine are in the same vertical direction. If they are not in the same vertical direction, lift the crankshaft slightly, loosen the first locking adjustment component 34, and fine-tune the height of the length adjustment mechanism 3, or loosen the second locking adjustment component 212 and fine-tune the position of the sliding displacement mechanism 2 on the I-beam 12. After fine-tuning, tighten the first locking adjustment component 34 and the second locking adjustment component 212 again until the inclined oil hole on the crankshaft connecting rod journal and the electrode of the EDM machine are in the same vertical direction.

[0068] Finally, after checking that all bolts on the fixture are tightened, EDM work can be carried out. Throughout the operation, a crane and slings are used to provide secondary protection for the crankshaft to avoid the risk of falling.

[0069] This embodiment has the following advantages:

[0070] When machining large crankshaft oil holes, especially oblique oil holes on connecting rod journals, if the drill bit suddenly breaks off inside the crankshaft, it can be removed using electrical discharge machining (EDM). Multiple products and models of crankshafts can share a single tooling to achieve EDM positioning machining, reducing the losses to the company caused by drill bits or taps breaking off inside the crankshaft and avoiding the scrapping of crankshaft products.

[0071] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0074] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A crankshaft oil hole EDM positioning tooling, characterized in that, include: The base mechanism (1), sliding displacement mechanism (2), length adjustment mechanism (3) and supporting reinforcing rod (4) are provided. The sliding displacement mechanism (2) is slidably mounted on the base mechanism (1). The length adjustment mechanism (3) is vertically fixed at the top of the sliding displacement mechanism (2). The supporting reinforcing rod (4) is inclined and its two ends are fixedly connected to the top of the sliding displacement mechanism (2) and the side wall of the length adjustment mechanism (3) respectively.

2. The crankshaft oil hole EDM positioning tooling according to claim 1, characterized in that, The base mechanism (1) includes: two displacement bases (11), an I-beam (12), a crankshaft lower limit block (13) and two limit side plates (14). The two limit side plates (14) are fixedly disposed at both ends of the I-beam (12), the two displacement bases (11) are fixedly disposed at both sides of the bottom end of the I-beam (12), the crankshaft lower limit block (13) is fixedly disposed at the top end of the I-beam (12), and the sliding displacement mechanism (2) is slidably mounted on the I-beam (12).

3. The crankshaft oil hole EDM positioning tooling according to claim 2, characterized in that, The displacement base (11) includes at least two omnidirectional wheels (111) that can be braked and a support base plate (112). The omnidirectional wheels (111) are rotatably mounted on the bottom end of the support base plate (112), and the I-beam (12) is fixed to the top end of the support base plate (112).

4. The crankshaft oil hole EDM positioning tooling according to claim 2, characterized in that, The crankshaft lower limit block (13) is a block structure with a U-shaped groove at the top.

5. The crankshaft oil hole EDM positioning tooling according to claim 2, characterized in that, The sliding displacement mechanism (2) includes two sliding components (21) and a connecting plate (22). The connecting plate (22) is fixed on the top of the two sliding components (21). The two sliding components (21) are spaced apart and slidably mounted on the I-beam (12). The bottom end of the supporting reinforcing rod (4) is fixedly connected to the top end of the connecting plate (22).

6. The crankshaft oil hole EDM positioning tooling according to claim 5, characterized in that, The sliding assembly (21) includes: a sliding plate (211), two second locking adjustment members (212), two lower rolling limit members (213), and an upper rolling limit member (214). The sliding plate (211) is an inverted U-shaped plate structure. The connecting plate (22) is fixed to the top of the sliding plate (211). The second locking adjustment members (212), the lower rolling limit members (213), and the upper rolling limit members (214) are fixed inside the sliding plate (211) from bottom to top. Two locking adjustment parts (212) are respectively arranged on both sides of the vertical plate of the I-shaped steel (12). The second locking adjustment part (212) abuts or separates from the side wall of the vertical plate of the I-shaped steel (12). Two lower rolling limit parts (213) are respectively arranged on both sides of the vertical plate of the I-shaped steel (12). The lower rolling limit part (213) rolls with the bottom end of the upper horizontal plate of the I-shaped steel (12). The upper rolling limit part (214) rolls with the top end of the upper horizontal plate of the I-shaped steel (12).

7. The crankshaft oil hole EDM positioning tooling according to claim 6, characterized in that, The lower rolling limit member (213) includes a lower roller (2131) and a lower fixing rod (2132). One end of the lower fixing rod (2132) is fixed on the inner wall of the sliding plate (211), and the lower roller (2131) is rotatably fixed on the other end of the lower fixing rod (2132). The lower roller (2131) rolls with the bottom end of the horizontal plate on the I-beam (12).

8. The crankshaft oil hole EDM positioning tooling according to claim 6, characterized in that, The upper rolling limiting component (214) includes an upper rolling rod (2141) and two upper fixing blocks (2142). The two upper fixing blocks (2142) are fixedly mounted on the inner walls of both sides of the sliding plate (211). The upper rolling rod (2141) is rotatably mounted between the two upper fixing blocks (2142). The upper rolling rod (2141) rolls with the top end of the horizontal plate of the I-beam (12). The two upper fixing blocks (2142) are mounted on both sides of the horizontal plate of the I-beam (12).

9. The crankshaft oil hole EDM positioning tooling according to claim 1, characterized in that, The length adjustment mechanism (3) includes an outer adjustment cylinder (31), an inner adjustment rod (32), and a crankshaft upper limit block (33). The outer adjustment cylinder (31) is vertically fixed at the top of the sliding displacement mechanism (2). The inner adjustment rod (32) can move up and down and is locked inside the outer adjustment cylinder (31). The crankshaft upper limit block (33) is a block structure with a U-shaped groove at the top. The crankshaft upper limit block (33) is fixed at the top of the inner adjustment rod (32). The top of the supporting reinforcing rod (4) is fixedly connected to the upper side wall of the outer adjustment cylinder (31).

10. The crankshaft oil hole EDM positioning tooling according to claim 9, characterized in that, The length adjustment mechanism (3) further includes a first locking adjustment member (34). The side wall of the outer adjustment cylinder (31) is symmetrically provided with two adjustment holes (311) along the axial direction. The adjustment holes (311) are vertically arranged strip-shaped through holes. The side wall of the inner adjustment rod (32) is provided with multiple sets of locking holes at axial intervals. Each set of locking holes is a through hole symmetrically arranged along the axial direction. The first locking adjustment member (34) passes through the locking holes and the adjustment holes (311) to fix the inner adjustment rod (32) to the outer adjustment cylinder (31).

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