Secondary tool correcting and boring tool for rear jaw of engineering truck bucket

Abstract

The utility model discloses a secondary tool correcting and boring tool for a rear jaw of an engineering truck bucket, which comprises a first boring tool and a second boring tool, the first boring tool is used for installing and welding parts, and the second boring tool is used for boring the parts. The second boring tool comprises a main body bracket and a #-shaped connecting rod which is arranged on the main body bracket and is parallel to the main body bracket, a mandrel is fixed on the #-shaped connecting rod, and two pairs of positioning structures are arranged at the two ends of the main body bracket in an aligned manner; the positioning structure comprises a positioning tool correcting block arranged at the uppermost end, a positioning plug pin is arranged on the positioning tool correcting block, the positioning tool correcting block is fixed to the base through a rhombic positioning pin and a positioning pin, a wear-resisting sleeve is embedded in the positioning tool correcting block, and a hinged type pressing mechanism is further arranged to press the positioning tool correcting block. By adopting the boring tool, the position of each group of holes is ensured to be within the range of design technical requirements, the parallelism between the connecting lines of the centers of the holes is also ensured, and the other problems are also reasonably solved on the basis, so that the technical requirements of the bucket rear jaw are completely met.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts processing, and in particular relates to a secondary tool calibration and boring tool for a rear jaw of an engineering vehicle bucket. Background Art

[0002] Reference Figure 1-Figure 3 , is the rear jaw of an engineering truck bucket. The main features of this part are large size, complex structure, high matching relationship between multiple groups of holes, and the main frame is welded from blank thin plates, so the welding dimensional stability is poor. Therefore, there are the following difficulties in processing this part: (1) The size and relative position relationship of the five groups of holes are high, but due to the structure, they cannot be completed by clamping and boring at one time; (2) The boring depth is too deep; (3) The welding dimensional stability is poor, resulting in a lack of a unified and stable reference during boring; (4) The machine tool must rotate 180° during the boring process, and the machine tool rotation error is large.

[0003] As can be seen from the figure, the whole part is a welded structure. From the technical requirements analysis: the part has five groups of holes, A, B, C, D, and E. Technically, it must be ensured that the holes in group B are coaxial with the holes in group C, and the holes in group D are coaxial with the holes in group E. In addition, it must be ensured that the center line of the holes in group A is parallel to the center line of the holes in groups B and C, and must be parallel to the center line of the holes in groups D and E at the same time. The position of each group of holes must be guaranteed, and the distance S1 must be symmetrical along the center line. The technical requirements are high.

[0004] From the perspective of structure and material analysis: because the welded plates are all thin plates and are all blanks, the dimensional uniformity after welding is poor, resulting in a lack of unified benchmarks for subsequent processing; the four groups of holes B, C, D, and E are distributed on both sides of the workpiece and are the farthest apart, so it is difficult to ensure the coaxiality and parallelism between the four groups of holes; the holes in group A are blocked by the side panels on both sides. If only the holes in groups B and C are processed, the relationship between the holes in group A and the four groups of holes B, C, D, and E cannot be guaranteed, and the processing difficulty is further increased; in addition, the depths of S3 and S4 are relatively deep during boring, and ordinary tool rods cannot meet the boring requirements, and the diameters of the holes in groups B and C are equal, and the diameters of the holes in groups D and E are equal, and the overall shape is symmetrical along the center line.

[0005] Therefore, it is necessary to combine the structural characteristics of the part, design reasonable processing steps and boring tooling, solve the above difficulties, ensure the machining accuracy and quality requirements of the parts, and at the same time ensure the processing economy.

[0006] The Chinese utility model patent with the publication number CN217859678U discloses a welding fixture for the front subframe of the automobile chassis, including a BASE plate, a front suspension frame positioning clamping mechanism, a longitudinal beam front positioning clamping mechanism, a front swing arm bracket positioning clamping mechanism, a stabilizer bar bracket positioning clamping mechanism, a longitudinal beam rear positioning clamping mechanism and a rear cross beam positioning clamping mechanism, each of which has two groups, and is symmetrically arranged on both sides of the BASE plate; it also includes two groups of longitudinal beam front positioning clamping mechanisms, which are respectively arranged at the front and rear sides of the BASE plate; and a rear suspension sleeve positioning clamping mechanism and a rear suspension bracket positioning clamping mechanism arranged in the middle of the rear end of the BASE plate. The structure is simple, the design is reasonable, the operation is convenient, the positioning is accurate, the fixture processing and manufacturing cycle is short, and the prototype trial production needs can be quickly responded to, the installation plan arrangement can be met, the change cycle is short, and the product design changes can be responded to at any time. The Chinese invention patent with the publication number CN117620570A discloses a welding fixture for the rear subframe of the automobile chassis, including a tooling frame, a limit crank rod, an angle limit mechanism, and a transverse and longitudinal correction mechanism. The output end of the second cylinder of the present invention drives the lifting plate to move, and drives the longitudinal clamping top seat to press against the rear subframe body of the automobile chassis, and drives the opening guide member 1 and the opening guide member 2 to move downward synchronously through the slide bar and the two triangular guide frames to drive the slider to slide on the inclined end faces on both sides of the fixed frame, and then drives the upper end faces of the transverse clamping top plates on both sides to press against the middle section of one side of the rear subframe of the automobile chassis, so as to realize the transverse and longitudinal two-way positioning correction, avoid the thermal deformation of the relatively long transverse and longitudinal beams of the rear subframe during the welding process, and ensure the quality of the workpiece product; it can also realize the correction of the middle reinforcement rib of the rear subframe while quickly cooling and shaping, so as to avoid cracking of the weld at the welding end caused by the later correction. The above two devices are designed for different problems of the frame, but cannot solve the problem raised by this scheme. Utility Model Content

[0007] In order to solve the above problems, the utility model aims to provide a secondary tool calibration and boring tool for the rear jaw of an engineering vehicle bucket.

[0008] In order to achieve the above purpose, the utility model adopts the following technical scheme: a secondary tool calibration and boring tool for the rear jaw of an engineering vehicle bucket, including a first boring tool and a second boring tool, the first boring tool is used for assembly welding of parts, and the second boring tool is used for boring holes in parts.

[0009] Preferably, the first boring tool comprises a main body support, on which a plurality of positioning support plates are arranged, the positioning support plates fix the part bottom plate from all sides, and fix the part vertical plate through a latch assembly.

[0010] Preferably, the second boring tool comprises a main body support, a cross-shaped connecting rod arranged on the main body support and parallel to the main body support, a core shaft is fixed on the cross-shaped connecting rod, and two pairs of positioning structures are arranged at both ends of the main body support in an aligned manner;

[0011] The positioning structure includes a positioning and calibration block arranged at the uppermost end, on which a positioning pin is arranged. The positioning and calibration block is fixed to the base through a diamond-shaped positioning pin and a positioning pin. A wear-resistant sleeve is embedded in the positioning and calibration block and an articulated clamping mechanism is also arranged to clamp it.

[0012] Preferably, the main frame is in a tic-tac-toe shape, a plurality of tightening screws and pressure plates are arranged on its outer frame, and correction reference blocks are arranged on the side surfaces at both ends by integral welding as correction reference surfaces.

[0013] Preferably, the positioning and calibration knife block is convex in shape, with a positioning pin connected to its upper end, U-shaped grooves are provided on the upper surfaces on both sides of its lower end, and diamond-shaped positioning pins and positioning pins are vertically connected on the two side surfaces of the lower end, and the articulated clamping mechanism is fixed to the positioning and calibration knife block through the U-shaped groove.

[0014] The hinged pressing mechanism comprises a T-shaped positioning column, and a matching nut and gasket.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The first boring tooling structure is targeted, completing the welding of the bottom plate, the vertical plate and the remaining parts, ensuring the S2 distance and mutual parallelism, simple operation and improved efficiency; a special tool bar is designed to solve the problem of too deep boring distance.

[0017] 2. The positioning and calibration tool of the second boring tool is a detachable structure, which is matched with other structures such as clamping, ensuring the convenience of the boring process and the relative position relationship between the A group of holes and the other groups of holes, ensuring the mechanical processing strength accuracy and quality requirements, and positioning the precision reference to ensure uniform pressure during the clamping process of the parts, and not easy to deform after removing the clamping device. The quick-release and quick-install structure is adopted to improve the processing efficiency. The second boring tool performs multiple tool calibrations, using the positioning and calibration tool block and the calibration reference surface to calibrate the tool, which not only ensures the processing position but also ensures the rotation error of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a top view of the rear jaw of the engineering vehicle bucket in the utility model;

[0020] Figure 2 It is a side view of the rear jaw of the engineering vehicle bucket in the utility model;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the rear jaw of the engineering vehicle bucket in the utility model;

[0022] Figure 4 It is a front view of a first boring tool clamping a part in the utility model;

[0023] Figure 5 It is a side view of a first boring tool clamping a part in the utility model;

[0024] Figure 6 It is a top view of a first boring tool clamping a part in the utility model;

[0025] Figure 7 It is a three-dimensional schematic diagram of a first boring tool clamping a part in the utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the medium-rough boring tool bar of the utility model;

[0027] Fig. 9 This is a schematic diagram of the structure of the fine boring tool bar in the utility model;

[0028] Fig.10 It is a three-dimensional schematic diagram of the first boring tool assembly and welding of the remaining parts in the utility model;

[0029] Fig.11 It is a top view of the remaining parts of the first boring tool assembly welding in the utility model;

[0030] Fig.12 It is a front view of the second boring tool in the utility model;

[0031] Fig.13 It is a top view of the second boring tool in the utility model;

[0032] Fig.14 It is a side view of the second boring tool in the utility model;

[0033] Fig.15 It is a top view of the positioning of the second boring tool in the utility model on the A group holes of the part and the two sides of S1 that have been processed;

[0034] Fig.16 It is a three-dimensional diagram of positioning the second boring tool in the utility model on the group A holes of the part and the two sides of S1 that have been processed;

[0035] Fig.17 This is a top view of the utility model in which a positioning pin is inserted to fix the parts;

[0036] Fig.18 A three-dimensional schematic diagram of inserting a positioning pin to fix a part in the utility model;

[0037] In the figure, 1-main bracket, 2-tic-tac-toe connecting rod, 3-core shaft, 4-diamond locating pin, 5-locating tool block, 6-wear-resistant sleeve, 7-locating latch, 8-locating pin, 9-tensioning screw, 10-pressure plate, 11-articulated clamping mechanism, 12-correction reference surface, 13-latch assembly, 14-bracket, 15-locating support plate, a-first boring tool, b-second boring tool; c-rough boring tool bar; d-fine boring tool bar. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0039] Reference Figure 1-3 As shown in the schematic diagram of the parts, because the bucket rear jaw blocks the boring process of the A group of holes in the middle part of the bucket rear jaw, a processing method is designed to weld the two vertical plates where the A group of holes in the middle part are located to the base bottom plate using the first boring tool a, then bore the A group of holes, and then weld the remaining parts and perform secondary precision boring.

[0040] The processing method is as follows:

[0041] 1.Reference Figure 4-6 The first boring tool a includes a bracket 14, on which a plurality of positioning support plates 15 are arranged. The positioning support plates 15 fix the bottom plate of the rear jaw of the bucket from all sides, and fix the part vertical plate through the latch assembly 13;

[0042] Reference Figure 7 During assembly welding, the pin assembly 13 pins are used as positioning elements, and the circular hole on the middle vertical plate of the bucket rear jaw group A is used as the rough positioning reference. The large surface of the bucket rear jaw bottom plate is leveled and 8 vertices are set around the bucket rear jaw to tighten the bucket rear jaw. The first boring tool a is used to weld the basic bottom plate and the two vertical plates to ensure the S2 distance on the bucket rear jaw and their parallelism.

[0043] 2. After welding, arrange the tie bars and install the accompanying fixture for welding to ensure the opening size of the two side plates of the rear jaw and their parallelism;

[0044] 3. After welding, let it stand for natural aging for a specified time to release welding deformation stress;

[0045] 4. Boring the A group of holes on the rear jaw of the bucket forms a unified benchmark for subsequent boring of other groups of holes. For this purpose, a special tool bar is designed to solve the problem of too deep boring distance. Figure 8 and Fig. 9In order to ensure that the processing technology requirements and processing performance are met, the rough boring bar c and the fine boring bar d are designed respectively. Compared with the conventional boring bar, the effective processing length and rigidity are improved;

[0046] 5.Reference Fig.10 and Fig.11 , continue to use the first boring tool a, assemble and weld the remaining parts, use the bolt assembly 13 bolts as positioning elements, use the round hole bored on the middle vertical plate of group A as the positioning precision reference, level the large surface of the bottom plate of the parts, set 8 vertices around to tighten the parts, and use the first boring tool a to assemble and weld the other parts except the basic bottom plate and the vertical plate;

[0047] 6. Use the second boring tool b to try to ensure the relative position relationship between the holes in group A and the remaining holes, and ensure the strength accuracy and quality requirements of machining; put the boring fixture on the boring machine workbench, calibrate the fixture, and keep the reference uniform; move the rear jaw, and still use the round hole bored on the middle vertical plate of group A of the rear jaw as the positioning precision reference, level the large surface of the bottom plate of the part, disperse 5 pressure points, and uniformly pressure. Set 8 vertices around to tighten the parts, so that they are not easily deformed after removing the clamping device; the boring sleeve adopts a quick-release and quick-install structure, which is conducive to improving processing efficiency;

[0048] Reference Figure 12-14 The second boring tool b includes a main frame 1, a cross-shaped connecting rod 2 arranged on the main frame 1 and parallel to the main frame 1, a core shaft 3 is fixed on the cross-shaped connecting rod 2, and two pairs of positioning structures are arranged at both ends of the main frame 1 in alignment; the positioning structure includes a positioning and calibration block 5 arranged at the uppermost end, a positioning pin 7 is arranged on the positioning and calibration block 5, and the positioning and calibration block 5 is fixed to the base through a diamond-shaped positioning pin 4 and a positioning pin 8, a wear-resistant sleeve 6 is embedded in the positioning and calibration block 5, and an articulated clamping mechanism 11 is also arranged to clamp it. The main frame 1 is in the shape of a cross, and a plurality of tightening screws 9 and a pressure plate 10 are arranged on its outer frame, and correction reference blocks are arranged on the side surfaces of both ends by integral welding as correction reference surfaces 12. The positioning and calibration knife block 5 is convex in shape, with a positioning pin 7 connected to its upper end, a U-shaped groove is provided on the upper surfaces on both sides of its lower end, and a diamond-shaped positioning pin 4 and a positioning pin 8 are vertically connected to the surfaces on both sides of the lower end, and the articulated clamping mechanism 11 is fixed to the positioning and calibration knife block 5 through the U-shaped groove. The articulated clamping mechanism 11 includes a T-shaped positioning column, and a matching nut and gasket.

[0049] The positioning and calibration block 5 is a detachable structure, with a wear-resistant sleeve 6 embedded inside. When clamping, the positioning and calibration block 5 cooperates with the fixed pin 7 to realize the positioning function, ensuring that the position of the hole to be processed is determined and correct; when boring, it can be used as the calibration reference for the machine tool spindle to ensure the correct processing feed position; that is, the positioning reference and the calibration reference are unified. When boring, it can be removed to facilitate the machine tool spindle feed and manual measurement. The positioning and calibration block 5 is positioned by the diamond positioning pin 4 and the positioning pin 8, and is clamped by the articulated clamping mechanism 11. Through the cooperation of the three, the positioning and calibration block 5 can be accurately positioned and quickly disassembled and assembled, ensuring the accuracy of the positioning of the four groups of holes B, C, D, and E and saving clamping time. During processing, the positioning and calibration blocks 5 at the left and right symmetrical positions are coaxial and the hole center connection line is parallel. The correction reference surface 12 is designed on both sides of the boring fixture, and is completed by the overall processing method after welding with the main bracket 1, which can effectively ensure the correction accuracy. When using it, the plane processed by the structure can be corrected.

[0050] The specific processing steps for holes in groups B, C, D, and E are as follows:

[0051] 1. First, the second boring tool b is hoisted onto the machine tool, and the second boring tool b is calibrated using the calibration reference surface 12;

[0052] 2.Reference Fig.15 and Fig.16 , hoist the bucket rear jaw onto the boring fixture. When clamping, first use the cross connecting rod 2 and the mandrel 3 to coordinate with the A group of holes in the second boring fixture b and the two sides of the processed S1 for positioning. This positioning mainly ensures that the processed bucket rear jaw is parallel as a whole, and the left and right sides of the bucket rear jaw are symmetrical along the center, and S1 is symmetrical along the center line, so that the A group of holes is connected with other groups of holes, which is the basis for ensuring that the hole center connection line is parallel;

[0053] 3.Reference Fig.17 and Fig.18 , use the positioning pin 7 to pass through the positioning tool block 5 until it is inserted into the holes of the parts B, C, D, and E respectively. The positioning pin 7 and the four holes of B, C, D, and E are matched with appropriate clearance to ensure smooth insertion. In this way, the theoretical position of the center of the four holes of B, C, D, and E can be found, and the position accuracy of the four holes and the coaxiality of the holes of B and C, and the holes of D and E can be ensured, and the hole line connection line is parallel;

[0054] 4. Use the tightening screw 9 and the pressing plate 10 to tighten to prevent loosening, and the clamping is completed;

[0055] 5. Install the special rough boring tool bar c on the machine tool spindle; pull out the positioning pins 7 inserted into the holes of group B and group D, and install the special rough boring tool bar c on the spindle to calibrate the holes on the positioning tool block 5. After the calibration, remove the positioning tool block 5, and rough bore the holes of group B, leaving an appropriate margin for fine machining;

[0056] 6. After rough boring of group B holes is completed, the spindle is withdrawn along the axial direction and replaced with a special fine boring tool bar d for fine machining. After machining of group B holes is completed, the spindle is withdrawn;

[0057] 7. Replace the spindle with a special rough boring tool bar c, move the spindle to calibrate the holes on the positioning tool block 5, remove the positioning tool block 5, rough bore the holes in group D, and leave appropriate allowance for finishing;

[0058] 8. After rough boring of group D holes is completed, the spindle is withdrawn along the axis direction and replaced with a special fine boring tool bar d for fine machining. The machining of group D holes is completed;

[0059] 9. After the processing of the B and D group holes is completed, the machine tool platform rotates 180°. After the rotation is completed, the calibration reference surface 12 is calibrated to compensate for the machine tool rotation error and ensure the processing accuracy of the D and E group holes.

[0060] 10. When boring holes in groups C and E, the processing can be completed by following the steps of boring holes in groups B and D.

[0061] This method, combined with the upper boring tooling, ensures that the positions of each group of holes are within the design technical requirements, and the parallelism between the lines connecting the hole centers is also guaranteed. On this basis, other problems are also reasonably solved, so the technical requirements of the bucket rear jaw are fully achieved.

[0062] The above is a detailed introduction to the secondary boring tooling for the rear jaw of the bucket of an engineering vehicle provided by the utility model. This article uses specific examples to illustrate the structure and working principle of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A secondary tool boring tool for the rear jaw of an engineering vehicle bucket, characterized in that: The invention comprises a first boring tool (a) and a second boring tool (b), wherein the first boring tool (a) is used for welding parts, and the second boring tool (b) is used for boring holes of parts; The first boring tool (a) comprises a bracket (14), on which a plurality of positioning support plates (15) are arranged, and the positioning support plates (15) fix the component bottom plate from all sides and fix the component vertical plate through a latch assembly (13); The second boring tool (b) comprises a main frame (1), a cross-shaped connecting rod (2) arranged on the main frame (1) and parallel to the main frame (1), a core shaft (3) being fixed on the cross-shaped connecting rod (2), and two pairs of positioning structures being arranged in alignment at both ends of the main frame (1).

2. The secondary boring tool for the rear jaw of the engineering vehicle bucket according to claim 1 is characterized in that: The positioning structure comprises a positioning and calibration block (5) arranged at the uppermost end, a positioning pin (7) being arranged on the positioning and calibration block (5), the positioning and calibration block (5) being fixed on the base through a diamond-shaped positioning pin (4) and a positioning pin (8), a wear-resistant sleeve (6) being embedded in the positioning and calibration block (5) and a hinged clamping mechanism (11) being arranged to clamp it.

3. The secondary boring tool for the rear jaw of the engineering vehicle bucket according to claim 1 is characterized in that: The main frame (1) is in a well-shaped shape, and a plurality of tightening screws (9) and a pressure plate (10) are arranged on its outer frame, and correction reference blocks are arranged on the side surfaces of both ends by integral welding as correction reference surfaces (12).

4. The secondary boring tool for the rear jaw of the engineering vehicle bucket according to claim 2 is characterized in that: The positioning and calibration knife block (5) is convex in shape, with a positioning pin (7) connected to its upper end, U-shaped grooves are provided on the upper surfaces on both sides of its lower end, and rhombus-shaped positioning pins (4) and positioning pins (8) are vertically connected to the two side surfaces of the lower end, and the articulated clamping mechanism (11) is fixed to the positioning and calibration knife block (5) through the U-shaped groove.

5. The secondary boring tool for the rear jaw of the engineering vehicle bucket according to claim 2 is characterized in that: The hinged pressing mechanism (11) comprises a T-shaped positioning column, and a matching nut and gasket.

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