Bearing cover four-axis tooling

Abstract

The utility model relates to mechanical manufacturing technical field, especially a bearing cap four -axis frock, the bearing cap four -axis frock includes: positioning structure and clamping structure, main bearing cap places in positioning structure, and is fastened by clamping structure, and positioning structure is connected with the workstation of machine tool, positioning structure includes first board, second board, a plurality of locating block and locating seat, and the three sides of second board adjacent are installed with at least locating block respectively, first board and locating seat are installed in the opposite two sides of second board respectively, and first board is equipped with the locating face, and the process hole is established in the locating face, clamping structure includes screw rod, connecting plate and pressing plate, and connecting plate is installed in first board and is equipped with the screw hole of meshing with screw rod, and the pressing plate is clamped in screw rod, the bearing cap four -axis frock positioning structure and clamping structure adopt modularization design, and the clamping force can be adjusted, and multidimensional positioning is positioned to guarantee the machining accuracy.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, and in particular to a four-axis tooling for bearing covers. Background Technology

[0002] The main bearing cap of the engine is a key core component in the crankshaft and connecting rod mechanism of the engine. It has a complex structure and requires precision in machining features such as planes, bolt holes, locating pin holes and oil holes. The manufacturing precision of each feature affects the reliability, lifespan, noise and vibration level of the engine.

[0003] Currently, in more traditional production models, workpieces need to be clamped and positioned multiple times between different machine tools and special fixtures, which is prone to deviation, resulting in large cumulative errors, low production efficiency, and high requirements for operator skills. When flipping and re-clamping are required, it is difficult to ensure repeatability and positioning accuracy, and the efficiency is low. Using general-purpose fixtures for clamping results in poor positioning accuracy and interference. Summary of the Invention

[0004] The main purpose of this utility model is to provide a four-axis tooling for bearing covers, which adopts a modular design for the positioning and clamping structures, with adjustable clamping force and multi-dimensional positioning to ensure machining accuracy.

[0005] To achieve the above objectives, this utility model proposes a four-axis bearing cover tooling for positioning and fixing during the machining of the main bearing cover, comprising: a positioning structure and a clamping structure, wherein the main bearing cover is placed on the positioning structure and fastened by the clamping structure, and the positioning structure is connected to the worktable of the machine tool. The positioning structure includes a first plate, a second plate, a plurality of positioning blocks and a positioning seat. At least one positioning block is installed on each of the three adjacent sides of the second plate. The first plate and the positioning seat are respectively installed on opposite sides of the second plate. The first plate is provided with a positioning surface and a process hole is provided at the positioning surface. The clamping structure includes a screw, a connecting plate, and a pressure plate. The connecting plate is mounted on the first plate and has a threaded hole that engages with the screw. The pressure plate is secured to the screw.

[0006] In an optional embodiment, the screw includes a first part, a second part, and a third part connected to the first part and the second part. The first part engages with the threaded hole. The third part is provided with a keyway, and the pressure plate is secured in the keyway. The second part engages with and is secured to a locking member.

[0007] In an optional embodiment, the positioning seat and the second plate are provided with a plurality of positioning grooves, and the plurality of positioning grooves of the positioning seat are coaxially engaged with the plurality of positioning grooves of the second plate.

[0008] In an optional embodiment, the positioning surface is set as an arc-shaped surface and fits against the arc-shaped surface of the main bearing cover; the process hole is coaxially engaged with the positioning hole of the main bearing cover; and the positioning seat fits against the central structure of the main bearing cover.

[0009] In an alternative embodiment, the first plate is provided with a groove, and the main bearing cover reference boss is secured in the groove.

[0010] In an optional embodiment, the first plate is provided with mounting grooves on both sides, each mounting groove abutting against a corresponding positioning block, and the positioning blocks on opposite sides respectively secure the main bearing cover on both sides.

[0011] In an optional embodiment, the first plate has stop bosses on both sides of its edges, and the stop bosses are attached to and secured to the machine tool's worktable.

[0012] In an optional embodiment, the first plate and the second plate are respectively provided with a plurality of connecting holes, and the plurality of connecting holes are respectively installed with positioning pins or fasteners. The positioning pins position the main bearing cover, and the fasteners are coaxially fastened to the worktable of the machine tool.

[0013] In an optional embodiment, the connecting plate includes a positioning post and a positioning platform connected to the positioning post. The first plate has a slot, and the positioning post is installed in the slot. The second plate has a slot, and the positioning platform is secured in the slot.

[0014] In an optional embodiment, the second plate is provided with a plurality of assembly slots, which respectively cooperate with the corresponding structure of the machine tool; the second plate and the connecting plate are respectively provided with a plurality of fixing slots, and the plurality of fixing slots of the second plate and the plurality of fixing slots of the connecting plate are coaxially cooperated. This utility model discloses a four-axis bearing cover fixture, comprising: a positioning structure and a clamping structure. The main bearing cover is placed on the positioning structure and fastened by the clamping structure. The positioning structure is connected to the worktable of a machine tool. The positioning structure includes a first plate, a second plate, several positioning blocks, and a positioning seat. At least one positioning block is installed on each of the three adjacent sides of the second plate. The first plate and the positioning seat are respectively installed on opposite sides of the second plate. The first plate has a positioning surface with process holes. The clamping structure includes a screw, a connecting plate, and a pressure plate. The connecting plate is installed on the first plate and has a threaded hole that meshes with the screw. The pressure plate is secured to the screw.

[0015] In this invention, the main bearing cover is placed on the positioning structure, making it fit against the positioning surface, positioning hole, and positioning seat. The main bearing cover is limited by several positioning blocks. The rotating screw drives the pressure plate to press the main bearing cover. The machine tool and related programs are started to mill the peripheral surface of the main bearing cover, drill and tap the holes. After completion, the machine tool drives the four-axis tooling of the bearing cover to rotate, and precision mills the two sides of the main bearing cover. The screw is released, the bearing cover is removed, and the processing is completed. It can be seen that the clamping force of the rotating screw is adjustable, the positioning structure provides multi-dimensional positioning, and the positioning structure and clamping structure cooperate with each other to ensure processing accuracy. The modular design of the positioning structure and clamping structure allows for the replacement of positioning blocks and screws and other components according to the structural differences of different bearing cover models, so as to adapt to various bearing covers and reduce the cost of purchasing and maintaining tooling. Attached Figure Description

[0016] 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 the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of one embodiment of a four-axis tooling for a bearing cover according to the present invention; Figure 2 This is a schematic diagram of one embodiment of a four-axis tooling for a bearing cover according to the present invention; Figure 3 for Figure 1 and Figure 2 A perspective view of a four-axis tooling for a bearing cover according to this utility model; Figure 4 for Figure 3 A perspective view of a four-axis tooling for a bearing cover according to this utility model; Figure 5 for Figure 4 A cross-sectional view along the AA direction of a four-axis tooling for a bearing cover is shown. Figure 6 for Figure 3 A perspective view of a four-axis tooling for bearing caps according to this utility model.

[0018] Explanation of icon numbers: 100 Positioning structure 14 Positioning seat 10 First board 15 positioning groove 10a Positioning surface 200 Clamping structure 10b Process Holes 20 screw 10c groove 20a Part One 10d Mounting slot 20b Part Two 10e Stop boss 20c Part Three 10f notch 21 Connecting plate 11 Second board 21a Positioning Post 11a Assembly slot 21b Positioning station 11b Card slot 22 Fixed slot 12 Connection hole 23 pressure plate 13 Positioning block The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0022] Reference Figures 1 to 6 This utility model proposes a four-axis tooling for bearing caps.

[0023] In this embodiment of the utility model, specifically, the bearing cover four-axis tooling is used for positioning and fixing during the machining of the main bearing cover, and includes: a positioning structure 100 and a clamping structure 200. The main bearing cover is placed on the positioning structure 100 and fastened by the clamping structure 200. The positioning structure 100 is connected to the worktable of the machine tool.

[0024] The positioning structure 100 includes a first plate 10, a second plate 11, several positioning blocks 13, and a positioning seat 14. The first plate 10, the second plate 11, and the positioning seat 14 can be made of 40Cr alloy steel, which has good strength, toughness, and wear resistance, and can withstand the clamping force of the bearing cover four-axis tooling and the vibration load during machine tool processing. Surface carburizing and nitriding treatments facilitate machining and improve wear resistance and precision retention, but are not limited to these features. At least one positioning block 13 is installed on each of the three adjacent sides of the second plate 11. The first plate 10 and the positioning seat 14 are respectively installed on opposite sides of the second plate 11. The first plate 10 has a positioning surface 10a, and a process hole 10b is opened at the positioning surface 10a. The positioning surface 10a is a raised arc extending from one side of the first plate 10, which is flattened at the tangent point of the arc to create a flat surface. This flat surface fits against the corresponding positioning block 13, serving a positioning function. Understandably, several positioning blocks 13 are fixed to the second plate 11, the positioning seat 14 is fixed to the second plate 11, and the first plate 10 is fixed to the second plate 11. The fixing method is to use bolts to achieve a rigid connection, so as to avoid affecting the machining accuracy of the main bearing cover due to loose connection.

[0025] Furthermore, the curved surface of the main bearing cover is absolutely essential. The positioning hole can be omitted in most main bearing cover parts due to special design. The central structure is functionally oriented and not uniformly essential. In the design of the main bearing cover of the MTU engine, the positioning hole and the curved surface are core structures that must be included. The central structure, also known as the bearing shell mounting cavity, is a functionally essential item. The MTU main bearing cover is provided with a reference boss, and the first plate 10 has a groove 10c. The reference boss of the main bearing cover is fixed in the groove 10c, which restricts the circumferential rotational freedom of the main bearing cover and ensures the positional accuracy during processing. The first type of main bearing cover, featuring positioning holes, an arc-shaped surface, and a central structure, utilizes positioning surface 10a, which is set as an arc-shaped surface and fits snugly against the arc-shaped surface of the first type of main bearing cover. Process hole 10b coaxially engages with the positioning hole of the first type of main bearing cover. Positioning seat 14 fits snugly against the central structure of the first type of main bearing cover. The first type of main bearing cover achieves six-point positioning on this four-axis tooling. Several positioning surfaces 10a are added to position and fix the side of the first type of main bearing cover, ensuring the unique position of the first type of main bearing cover on this four-axis tooling and controlling accuracy. For a very small number of small engines or a simplified design of the second type of main bearing cover, dual positioning can be achieved through positioning surface 10a plus several other positioning surfaces 10a.

[0026] Please refer to Figure 1 , Figure 2 and Figure 5The clamping structure 200 includes a screw 20, a connecting plate 21, and a pressure plate 23. The connecting plate 21 is mounted on the first plate 10 and has a threaded hole that engages with the screw 20. The connecting plate 21 has several countersunk threaded holes for rigid fixation with countersunk screws, ensuring it does not interfere with the pressure plate 23 clamping the spindle cover. The pressure plate 23 is secured to the screw 20. The screw 20 includes a first part 20a, a second part 20b, and a third part 20c connected to the first part 20a and the second part 20b. The first part 20a engages with the threaded hole; the third part 20c has a keyway, and the pressure plate 23 is secured to the keyway; the second part 20b engages with a locking element. It is understood that the first part 20a and the second part 20b can be selected to use fine threads, and the locking element can be a lock nut or other locking element. A stop washer is added between the lock nut and the pressure plate 23 to further prevent loosening. Preferably, the screw 20 can be made of 40Cr alloy steel. After tempering and surface quenching, the threaded portion has high strength and wear resistance, ensuring clamping force and preventing thread stripping or deformation after long-term use, but this is not the only option. Preferably, the positioning block 13 and the pressure plate 23 can be made of Cr12MoV mold steel, with a hardness of HRC58-62 after quenching, effectively resisting friction and extrusion from the main bearing cap, and maintaining positioning accuracy even after long-term use, but this is not the only option.

[0027] Furthermore, please refer to again Figure 1 , Figure 2 and Figure 5 The first plate 10 has mounting grooves 10d on both sides and stop bosses 10e on both sides. Each mounting groove 10d abuts against a corresponding positioning block 13, which secures the opposite positioning block 13 to both sides of the main bearing cover. The stop bosses 10e fit against and secure the machine tool's worktable. The stop bosses 10e cooperate with the machine tool's worktable to achieve precise positioning and stable support of the four-axis tooling for the bearing cover, preventing displacement during processing and ensuring the machining dimensions and positional accuracy of the main bearing cover. The second plate 11 has several assembly grooves 11a, which respectively cooperate with the corresponding structures of the machine tool. The first plate 10 and the second plate 11 each have several connecting holes 12, with different opening sizes to facilitate the installation of positioning pins or fasteners of different diameters. The positioning pins are used for positioning the main bearing cover, and the fasteners are coaxially fastened to the machine tool's worktable.

[0028] Please refer to Figure 5The connecting plate 21 includes a positioning post 21a and a positioning platform 21b connected to the positioning post 21a. The first plate 10 has a slot 10f, into which the positioning post 21a is installed. The second plate 11 has a slot 11b, into which the positioning platform 21b is secured. The diameter of the slot 10f is the same as the diameter of the positioning post 21a. The shape of the slot 11b is the same as that of the positioning platform 21b, and the depth of the slot 11b is greater than the depth of the positioning platform 21b, facilitating stable securing of the positioning platform 21b. Preferably, the connecting plate 21 can be made of the same 40Cr alloy steel as the screw 20. After tempering and surface quenching, the threaded portion has high strength and wear resistance, preventing wear on the threaded portion of the screw 20 during long-term rotation and ensuring clamping force, but this is not the only option. The connecting plate 21 is fixed to the second plate 11 using bolts for rigid connection, effectively preventing displacement of the clamping structure 200 and affecting the machining accuracy of the main bearing cover.

[0029] Furthermore, please refer to again Figure 2 and Figure 5 The positioning seat 14 and the second plate 11 are provided with a plurality of positioning grooves 15. The plurality of positioning grooves 15 of the positioning seat 14 are coaxially engaged with the plurality of positioning grooves 15 of the second plate 11 and are fixed by screws. The second plate 11 and the connecting plate 21 are respectively provided with a plurality of fixing grooves 22. The plurality of fixing grooves 22 of the second plate are coaxially engaged with the plurality of fixing grooves 22 of the connecting plate 21 and are fixed by screws.

[0030] In this invention, the main bearing cover is placed on the positioning structure 100, making it fit against the positioning surface 10a, positioning hole, and positioning seat 14. The main bearing cover is limited by several positioning blocks 13. The rotating screw 20 drives the pressure plate 23 to press the main bearing cover. The machine tool and related programs are started to mill the peripheral surface of the main bearing cover, drill and tap the holes. After completion, the machine tool drives the four-axis tooling of the bearing cover to rotate, and precision mills the two sides of the main bearing cover. The screw 20 is released, the bearing cover is removed, and the processing is completed. It can be seen that the clamping force of the rotating screw 20 is adjustable, the positioning structure 100 provides multi-dimensional positioning, and the positioning structure 100 and the clamping structure 200 cooperate with each other to ensure processing accuracy. The modular design of the positioning structure 100 and the clamping structure 200 allows for the replacement of components such as the positioning blocks 13 and the screw 20 according to the structural differences of different bearing cover models, so as to adapt to various bearing covers and reduce the cost of purchasing and maintaining tooling.

[0031] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A four-axis tooling for bearing caps, used for positioning and fixing during the machining of main bearing caps, characterized in that, include: The positioning structure and clamping structure are provided. The main bearing cover is placed on the positioning structure and fastened by the clamping structure. The positioning structure is connected to the worktable of the machine tool. The positioning structure includes a first plate, a second plate, a plurality of positioning blocks and a positioning seat. At least one positioning block is installed on each of the three adjacent sides of the second plate. The first plate and the positioning seat are respectively installed on opposite sides of the second plate. The first plate is provided with a positioning surface and a process hole is provided at the positioning surface. The clamping structure includes a screw, a connecting plate, and a pressure plate. The connecting plate is mounted on the first plate and has a threaded hole that engages with the screw. The pressure plate is secured to the screw.

2. The four-axis tooling for a bearing cover as described in claim 1, characterized in that, The screw includes a first part, a second part, and a third part connected to the first part and the second part. The first part engages with the threaded hole. The third part is provided with a keyway, and the pressure plate is secured in the keyway. The second part engages with and is secured with a locking member.

3. The four-axis tooling for a bearing cover as described in claim 1, characterized in that, The positioning seat and the second plate are provided with a plurality of positioning grooves, and the plurality of positioning grooves of the positioning seat are coaxially engaged with the plurality of positioning grooves of the second plate.

4. The four-axis tooling for a bearing cover as described in claim 1, characterized in that, The positioning surface is set as an arc-shaped surface and fits into the arc-shaped surface of the main bearing cover; the process hole is coaxially fitted with the positioning hole of the main bearing cover; the positioning seat fits into the central structure of the main bearing cover.

5. A four-axis tooling for a bearing cover as described in claim 4, characterized in that, The first plate is provided with a groove, and the reference boss of the main bearing cover is fixed in the groove.

6. The four-axis tooling for a bearing cover as described in claim 5, characterized in that, The first plate has mounting grooves on both sides, each mounting groove abuts against a corresponding positioning block, and the positioning blocks on opposite sides respectively secure the main bearing cover on both sides.

7. A four-axis tooling for a bearing cover as described in claim 6, characterized in that, The first plate has stop protrusions on both sides of its edge, and the stop protrusions are attached to and secured to the worktable of the machine tool.

8. A four-axis tooling for a bearing cover as described in claim 7, characterized in that, The first plate and the second plate are respectively provided with a plurality of connecting holes, and the plurality of connecting holes are respectively installed with positioning pins or fasteners. The positioning pins position the main bearing cover, and the fasteners are coaxially fastened to the worktable of the machine tool.

9. A four-axis tooling for a bearing cover as described in claim 8, characterized in that, The connecting plate includes a positioning post and a positioning platform connected to the positioning post. The first plate has a slot, and the positioning post is installed in the slot. The second plate has a slot, and the positioning platform is secured in the slot.

10. A four-axis tooling for a bearing cover as described in claim 9, characterized in that, The second plate is provided with a plurality of assembly slots, which respectively cooperate with the corresponding structure of the machine tool; the second plate and the connecting plate are respectively provided with a plurality of fixing slots, and the plurality of fixing slots of the second plate and the plurality of fixing slots of the connecting plate are coaxially cooperated.

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