Extension device for heavy super-long boring bar

Abstract

The utility model provides an extension device of a heavy super-long boring bar, which comprises an extension boring bar, a through central hole is processed in the center of the extension boring bar, a shaft neck is processed at one end of the extension boring bar, a groove is processed on the outer end face of the shaft neck of the extension boring bar, a positioning skirt edge is formed on the periphery of the groove, and the positioning skirt edge is arranged on the outer end face of the extension boring bar. A first key groove is machined in the groove in a crossed mode, and a plurality of bolt through holes are evenly machined in the groove and located in the annular area where the shaft neck is located. A positioning spigot is processed on the outer edge of the end surface of the other end of the lengthened boring rod, and the positioning spigot is matched with the positioning skirt edge; a crossed second key groove is machined in the end face where the positioning spigot is located; a key is fixedly installed on the second key groove through a screw. The lengthening device can be used for reliably lengthening the boring rod, ensures the structural strength and stability, and is well matched with the original boring rod to realize the processing of a cylinder sleeve product; in addition, cost is low, manufacturing period is short, installation is simple, and machining quality is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of boring machine processing, in particular to a device for extending a heavy-duty super-long boring bar. Background Art

[0002] See also Figure 1 Cylinder liners are the company's main products. With the update of high-horsepower low-speed diesel engine products, the length of cylinder liners has been increasing. Figure 2 , 3 , the processing length of the boring bar, an important component of the cylinder liner fine boring machine, which is its main processing equipment, is not enough. Usually, a longer boring bar needs to be made to meet the processing requirements, but there are many difficulties: the production of a new heavy-duty extra-long boring bar takes a long time and is costly. During installation, the original boring bar and related equipment need to be dismantled, and the installation precision of the new heavy-duty extra-long boring bar needs to be high, which is time-consuming and labor-intensive. Utility Model Content

[0003] The purpose of the utility model is to provide a heavy-duty extra-long boring bar extension device for the above-mentioned problem. The extension device can be used to reliably extend the boring bar and ensure the structural strength and stability, and cooperate well with the original boring bar to realize the processing of cylinder liner products; in addition, the cost is low, the production cycle is short, the installation is simple, and the processing quality is stable and reliable.

[0004] In order to realize the above-mentioned technical features, the purpose of the utility model is achieved as follows: a device for extending a heavy-duty extra-long boring bar, comprising an extended boring bar, the center of the extended boring bar is processed with a penetrating center hole, one end of the extended boring bar is processed with a shaft neck, the extended boring bar is processed with a groove on the outer end face where the shaft neck is located, and a positioning skirt is formed on the periphery of the groove, the interior of the groove is processed with a first keyway in a cross shape, and a plurality of bolt through holes are evenly processed on the groove and in the annular area where the shaft neck is located; the outer edge of the end face of the other end of the extended boring bar is processed with a positioning stop, and the positioning stop matches the positioning skirt; the end face where the positioning stop is located is processed with a second keyway in a cross shape; a key is fixedly installed on the second keyway by a screw.

[0005] The second keyway is processed with a first screw hole for installing a key.

[0006] A countersunk screw hole is processed on the key, and the countersunk screw hole matches with the screw to fix the key inside the second keyway.

[0007] The number of keys is four groups.

[0008] The extended boring bar is processed with a first stud bolt hole which is uniform in circumference on the end face where the positioning stop is located, and the first stud bolt hole matches with the bolt through hole on the opposite side.

[0009] The extended boring bar is processed with a second stud bolt hole which is uniform in circumference on the end face where the positioning stop is located.

[0010] During the process of connecting the extended boring bar with the original boring bar, a key is installed between the original boring bar and the first keyway, and the original boring bar and the extended boring bar are fixedly connected by stud bolts, washers and locking nuts.

[0011] The length of the extended boring bar has a variety of different size specifications.

[0012] The number of the first screw holes in the same second keyway is two.

[0013] The utility model has the following beneficial effects:

[0014] 1. This extension device can be used to reliably extend the boring bar and ensure the structural strength and stability. It can be well matched with the original boring bar to realize the processing of cylinder liner products. In addition, it has low cost, short production cycle, simple installation and stable and reliable processing quality.

[0015] 2. The extension device designed by the utility model can stably batch process new cylinder sleeve products that meet the requirements of the drawings, and can achieve full coverage of the fine processing of the inner holes of the medium-diameter series cylinder sleeves. When processing longer cylinder sleeves, it is no longer necessary to make new extra-long boring bars or disassemble the original boring bars. It is only necessary to assemble the extension device as required. The structure is simple, disassembly is convenient, the manufacturing and installation costs are low, and the precision of the processed products is stable and reliable. This extension device can be extended to the extension design of other extra-long boring bars.

[0016] 3. The first keyway and the second keyway facilitate the installation of a key at the connection portion so as to achieve torque transmission during operation.

[0017] 4. The coordination between the positioning stop and the groove ensures the positioning accuracy and reliability after docking.

[0018] 5. The second stud bolt hole mentioned above facilitates the subsequent connection between the extended boring rod and the output end of the fine boring cylinder machine.

[0019] 6. By adopting a variety of different specifications, it can well adapt to the use requirements of different lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 This is a structural diagram of the cylinder sleeve to be processed according to the utility model.

[0022] Figure 2 It is a cross-sectional view of the original boring bar of the utility model.

[0023] Figure 3 It is a side view of the original boring bar of the utility model.

[0024] Figure 4 This is a three-dimensional diagram of the extended boring bar of the utility model from the first perspective.

[0025] Figure 5 This is a three-dimensional diagram of the extended boring bar of the utility model from the second viewing angle.

[0026] Figure 6 It is the front view of the extended boring bar of the utility model.

[0027] Figure 7 It is a side view of the end where the groove of the extended boring bar of the utility model is located.

[0028] Figure 8 It is a side view of the end where the positioning stop of the extended boring bar of the utility model is located.

[0029] Fig. 9 The utility model is a long boring bar Figure 8 Medium AA view.

[0030] Fig.10 It is a top view of the key of the utility model.

[0031] Fig.11 It is a side view of the key of the utility model.

[0032] Fig.12 For this utility model Fig.10 Medium BB view.

[0033] Fig.13 It is a side view of the boring bar after being lengthened according to the utility model.

[0034] Fig.14 For this utility model Fig.13 View of the boring bar CC after the mid-length extension.

[0035] Fig.15 It is a structural schematic diagram of the utility model precision boring cylinder machine.

[0036] In the figure: extended boring bar 1, journal 2, groove 3, first keyway 4, positioning skirt 5, bolt through hole 6, center hole 7, positioning stop 8, second keyway 9, first screw hole 10, second stud bolt hole 11, first stud bolt hole 12, key 13, countersunk screw hole 14, stud bolt 15, locking nut 16, washer 17, screw 18, feed mechanism 19, main transmission mechanism 20, universal joint 21, front auxiliary support 22, extended boring bar 23, main bed 24, auxiliary bed 25, front support 26, cylinder liner 27, clamping front bracket 28, clamping rear bracket 29, rear support 30, rear auxiliary support 31. DETAILED DESCRIPTION

[0037] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0038] See also Figure 1-15 A device for extending a heavy-duty extra-long boring bar comprises an extended boring bar 1, wherein the center of the extended boring bar 1 is processed with a through center hole 7, one end of the extended boring bar 1 is processed with a journal 2, the extended boring bar 1 is processed with a groove 3 on the outer end face where the journal 2 is located, and a positioning skirt 5 is formed on the periphery of the groove 3, the interior of the groove 3 is processed with a first keyway 4 in a cross shape, and a plurality of bolt through holes 6 are evenly processed on the groove 3 and in the annular area where the journal 2 is located; the outer edge of the end face of the other end of the extended boring bar 1 is processed with a positioning stop 8, and the positioning stop 8 matches the positioning skirt 5; the end face where the positioning stop 8 is located is processed with a second keyway 9 in a cross shape; a key 13 is fixedly installed on the second keyway 9 by a screw 18. This extension device can be used to reliably extend the boring bar, and ensure the structural strength and stability, and cooperate well with the original boring bar to realize the processing of cylinder liner products; in addition, the cost is low, the production cycle is short, the installation is simple, and the processing quality is stable and reliable. In the specific use process, there is no need to disassemble the original boring bar, and it is only necessary to connect the extended boring bar 1 with the original boring bar.

[0039] The first keyway 4 and the second keyway 9 are convenient for installing the key 13 at the connection part so as to realize the transmission of torque during the working process.

[0040] The center hole 7 facilitates the first matching with the center hole of the original boring bar.

[0041] The cooperation between the positioning stop 8 and the groove 3 ensures the positioning and docking accuracy and reliability after docking.

[0042] The shaft neck 2 facilitates the fixed installation of the nut during the subsequent docking process.

[0043] Furthermore, a first screw hole 10 for installing the key 13 is processed on the second keyway 9. The first screw hole 10 facilitates the key 13 to be fixed and installed by screws.

[0044] Furthermore, a countersunk screw hole 14 is processed on the key 13, and the countersunk screw hole 14 cooperates with the screw 18 to fix the key 13 inside the second keyway 9. The key 13 is used to facilitate the transmission of torque.

[0045] Furthermore, there are four groups of keys 13. The use of multiple groups of keys 13 ensures reliable transmission of torque.

[0046] Furthermore, the extended boring bar 1 is processed with a circumferentially uniform first stud bolt hole 12 on the end face where the positioning stop 8 is located, and the first stud bolt hole 12 matches the bolt through hole 6 on the opposite side. The first stud bolt hole 12 can be used for reliable docking of the two.

[0047] Furthermore, the extended boring bar 1 is processed with a circumferentially uniform second stud bolt hole 11 on the end face where the positioning stop 8 is located. The second stud bolt hole 11 facilitates the subsequent connection between the extended boring bar 1 and the output end of the precision boring cylinder machine.

[0048] Furthermore, during the process of connecting the extended boring bar 1 to the original boring bar 32, a key 13 is installed between the original boring bar 32 and the first keyway 4, and the original boring bar 32 and the extended boring bar 1 are fixedly connected by stud bolts 15, washers 17 and lock nuts 16. Through the above connection structure, a reliable connection can be achieved during the extension process.

[0049] Furthermore, the length of the extended boring bar 1 has a variety of different sizes and specifications. By adopting a variety of different specifications, it can well adapt to the use requirements of different lengths.

[0050] Furthermore, the number of first screw holes 10 in the same second keyway 9 is two. The reliability of the fixed installation of the key 13 is ensured by the multiple first screw holes 10.

[0051] Embodiment 2:

[0052] When multiple extended boring bars 1 need to be connected, it is only necessary to connect the groove 3 end of the extended boring bar 1 with the positioning stop 8 end of another extended boring bar 1, install keys in the corresponding keyways, and finally connect them through stud bolts.

[0053] Embodiment 3:

[0054] Take 6G50ME-C9.5 cylinder liner as an example. Figure 1 , its length is 2695mm, inner hole is Φ500H8, roundness is ≤0.05mm, and finish is Ra1.6. Boring rods for fine boring machines for producing cylinder liners, Figure 2 and Figure 3 , with a diameter of Φ300mm, a length of 7m, an aspect ratio of 23.3, and a weight of 3.4 tons. It is a typical heavy-duty ultra-long boring bar, a key component of a fine boring machine. The original design maximum processing length is 2600mm, while the length of the new cylinder sleeve is nearly 2700mm, and it may be further lengthened in the future. Therefore, a lengthening device needs to be designed to meet the processing requirements. This lengthening device mainly plays two roles:

[0055] (1) The machining length of the new cylinder liner should be met, and there should be a margin.

[0056] (2) The extension device should have sufficient strength and processing accuracy when processing the cylinder liner.

[0057] The core of the extended boring bar is drilled with a through hole, and the connecting end is designed as an H-shaped journal, which not only reduces the weight of the extended boring bar, facilitates the installation of bolts and nuts, but also ensures the strength of the extended boring bar.

[0058] The bolt hole position, number of holes, bolt diameter and performance level of the connecting end have been analyzed and optimized by finite element analysis to ensure the strength and processing accuracy of the entire boring bar after the extension boring bar is installed. The extension boring bar is equipped with a positioning convex stop and an end face keyway at the left end, which can be connected to the transmission mechanism of the original equipment or assembled with the same type of extension device to further extend the processing length of the boring bar.

[0059] A method for assembling and using a heavy-duty extra-long boring bar extension device comprises the following steps:

[0060] Step 1: Extension of the original boring bar 32:

[0061] According to the length of the original boring bar 32 to be extended, select the extended boring bar 1 of the corresponding size, then match and connect the end of the original boring bar 32 with the end of the groove 3 of the extended boring bar 1, and support the extended boring bar 23 between the front auxiliary support 22 and the front support 26;

[0062] Step 2: Connect the boring bar 23 to the fine boring machine after lengthening:

[0063] The end of the positioning stop 8 of the extended boring bar 1 after installation is fixedly connected to the universal coupling 21 of the fine boring cylinder machine;

[0064] Step 3: Clamping of cylinder sleeve 27:

[0065] The cylinder sleeve 27 to be processed is clamped and installed between the clamping front bracket 28 and the clamping rear bracket 29 of the fine boring machine;

[0066] Step 4: Processing of cylinder sleeve 27:

[0067] The main transmission mechanism 20 of the fine boring machine is started, and the extended boring bar 23 is driven by the universal joint 21 through the main transmission mechanism 20, and the extended boring bar 23 drives the tool to process the cylinder sleeve 27, and during the processing, the feeding mechanism 19 is used for feeding;

[0068] Step 5, disassembly of cylinder sleeve 27:

[0069] After the cylinder sleeve 27 is processed, it is disassembled to process the next workpiece.

[0070] Embodiment 4:

[0071] like Fig.14As shown: the extended boring bar 1 is positioned with the original heavy-duty extra-long boring bar through the positioning step hole, with a matching tolerance of G6 / h6, the concentricity of the positioning step hole and the outer circle is ≤0.01mm, the outer diameter of the extended boring bar is consistent with the original boring bar size, and the shoulder surface runout is ≤0.01mm. After the extended boring bar 1 is assembled with the original boring bar, the shoulder surface is pressed tightly, and there is a 1-1.5mm gap between the inner end face of the step hole and the end face of the original boring bar; the key plays a role in transmitting power between the extended boring bar and the original boring bar, and is tightened in the keyway of the end face of the original boring bar with a hexagon socket screw. After the key is installed, there is a 1mm gap with the bottom face of the keyway of the extended boring bar 1. The extended boring bar 1 and the original boring bar are fastened with 8 sets of M16 stud bolts, hexagonal thick nuts, and elastic washers, and the performance grade of the stud bolts is 8.8. After the extended boring bar 1 is assembled with the original boring bar, check that the concentricity is ≤ 0.02 mm.

Claims

1. A device for extending a heavy-duty extra-long boring bar, characterized in that: The invention comprises an extended boring bar (1), wherein a central hole (7) is formed through the extended boring bar (1), a journal (2) is formed at one end of the extended boring bar (1), a groove (3) is formed on the outer end face of the extended boring bar (1) where the journal (2) is located, and a positioning skirt (5) is formed on the periphery of the groove (3), a first keyway (4) is formed in a cross pattern inside the groove (3), and a plurality of bolt through holes (6) are uniformly formed on the groove (3) and in an annular region where the journal (2) is located; a positioning stop (8) is formed on the outer edge of the end face of the other end of the extended boring bar (1), and the positioning stop (8) matches the positioning skirt (5); a second keyway (9) is formed on the end face where the positioning stop (8) is located, and a key (13) is fixedly mounted on the second keyway (9) by means of a screw (18).

2. A heavy-duty extra-long boring bar extension device according to claim 1, characterized in that: The second keyway (9) is provided with a first screw hole (10) for mounting a key (13).

3. A heavy-duty extra-long boring bar extension device according to claim 2, characterized in that: The key (13) is processed with a countersunk screw hole (14), and the countersunk screw hole (14) cooperates with the screw (18) to fix the key (13) inside the second keyway (9).

4. A heavy-duty extra-long boring bar extension device according to claim 3, characterized in that: The number of the keys (13) is four groups.

5. The device for extending a heavy-duty extra-long boring bar according to claim 1, characterized in that: The extended boring bar (1) is machined with a first stud bolt hole (12) which is uniformly circumferentially formed on the end surface where the positioning stop (8) is located, and the first stud bolt hole (12) matches the bolt through hole (6) on the opposite side.

6. The device for extending a heavy-duty extra-long boring bar according to claim 1, characterized in that: The extended boring bar (1) is machined with a second stud bolt hole (11) which is uniformly circumferentially disposed on the end surface where the positioning stop (8) is located.

7. The device for extending a heavy-duty extra-long boring bar according to claim 1, characterized in that: During the process of connecting the extended boring bar (1) to the original boring bar (32), a key (13) is installed between the original boring bar (32) and the first keyway (4), and the original boring bar (32) and the extended boring bar (1) are fixedly connected by means of stud bolts (15), washers (17) and lock nuts (16).

8. The device for extending a heavy-duty extra-long boring bar according to claim 1, characterized in that: The length of the extended boring bar (1) has a variety of different dimensions.

9. The device for extending a heavy-duty extra-long boring bar according to claim 1, characterized in that: The number of first screw holes (10) inside the same second keyway (9) is two.

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