CN117245553A

CN117245553A - Alignment tooling for crosshead pins of large low-speed marine diesel engines

Info

Publication number: CN117245553A
Application number: CN202311317597.8A
Authority: CN
Inventors: 刘胜; 王晨宇; 邓伟; 王培贺; 赵金刚; 崔茂策; 关政权
Original assignee: Dalian Marine Diesel Co ltd
Current assignee: Dalian Marine Diesel Co ltd
Priority date: 2023-10-12
Filing date: 2023-10-12
Publication date: 2023-12-19

Abstract

The tool for aligning the cross pin shaft of the low-speed diesel engine by the numerical control boring machine is characterized in that a middle part of the upper surface of a base is provided with a boss protruding upwards to form a longitudinal dovetail shape, dovetail grooves below two opposite adjustable supporting blocks of a triangular frame are in movable fit with the boss, a longitudinal T-shaped groove is also formed in the upper surface of the base, the nut end of a fastening bolt is in movable fit with the T-shaped groove, and the upper end of the fastening bolt penetrates through a connecting hole of the lower frame of the adjustable supporting block to be in matched connection with a fastening nut; the upper longitudinal two ends of the base are provided with fixing blocks, the fixing blocks penetrate through the connecting holes through fastening bolts to be connected and fixed with screw holes corresponding to the base, the longitudinal screw holes of the fixing blocks are matched with adjusting bolts, and the front ends of the fixing blocks are in contact with the adjustable supporting blocks. The alignment can be intuitively and efficiently completed by adjusting the adjusting bolts at any end of the tool; the base boss both sides face and adjustable supporting shoe lower extreme recess both sides face close fit, the condition of horizontal hunting can not appear in the adjustable supporting shoe in the back-and-forth movement in-process, and the regulation precision is higher.

Description

Alignment tool for cross pin shaft of large low-speed marine diesel engine

Technical Field

The invention relates to a special tool used when a numerical control boring machine processes a cross pin shaft concave baffle surface and a hole in the machining industry.

Background

The cross pin shaft of the low-speed diesel engine manufactured by the company is one of main machine closing parts, the weight is large, the processing technology is complex, the precision requirement is high, the perpendicularity between the outer circle and the end face is 0.01mm, and the parallelism between the concave gear surface and the outer circle is 0.02mm, so that the numerical control boring machine is required to be strictly aligned according to the standard of the rough grinding process (the upper bus and the side bus of the rough grinding outer circle) before the concave gear is processed. The side busbar alignment can be solved through the swivel work head, mainly goes up the busbar alignment and is more troublesome, because the V-arrangement iron that uses now belongs to general frock, the manufacturing accuracy of frock itself is not high, in addition the wearing and tearing of long-term use and the horizontal accuracy of workstation etc. error's influence, numerical control boring machine need to fill up the copper sheet on V-arrangement iron's inclined plane and carry out the alignment repeatedly when according to the alignment of coarse grinding benchmark (last busbar), complex operation, it is longer to occupy the auxiliary time, the time of single cross pin axle average alignment is about 1 hour, production efficiency is low.

Disclosure of Invention

Aiming at the bottleneck problem, the invention designs a simple and practical slideway type adjustable special alignment tool.

The technical scheme of the invention is as follows:

a frock for numerical control boring machine alignment low-speed diesel engine cross round pin axle has base, its characterized in that: the middle part of the upper surface of the base is provided with a boss protruding upwards in a longitudinal dovetail shape, the lower surfaces of two opposite adjustable supporting blocks of the triangular frame shape are provided with grooves which are in movable fit with the boss in a dovetail shape, and the two opposite adjustable supporting blocks are provided with symmetrical inclined planes to form a V shape; the upper surface of the base is also provided with a longitudinal T-shaped groove outside two sides of the boss, the nut end of the fastening bolt of the adjustable supporting block is movably matched and inlaid with the T-shaped groove, and the upper end of the fastening bolt passes through a connecting hole corresponding to the lower frame of the adjustable supporting block to be matched and connected with the fastening nut; the vertical both ends of base top are provided with the fixed block respectively, and the fixed block is vertical to have the connecting hole, and fastening bolt passes the screw cooperation that connecting hole corresponds with the base and is connected, and the fixed block is vertical to have the screw, and the screw cooperation has adjusting bolt, has adjusting bolt front end and the contact of the adjustable supporting shoe that corresponds. The tool (two sets of tool) is fixed at the proper position of the workbench according to the lengths of the cross pin shafts of different types, after the workpiece is installed, the bus on the surface is used for measuring the height difference of the outer diameters of two ends of the rough grinding reference, and the adjustable supporting block is enabled to slightly swing left and right after being screwed or loosened through the adjusting bolts, so that the alignment process can be intuitively and rapidly realized. The base of the tool is matched with the adjustable supporting block in a sliding way, gaps between two side faces of the boss at the upper end of the base and two side faces of the groove at the lower end of the adjustable supporting block are small, the left-right movement freedom degree of the adjustable supporting block in the front-back movement process is limited, and the positioning accuracy is high. The base of the tool is provided with two T-shaped grooves for installing fastening bolts of the adjustable supporting blocks. The fastening bolt of the tool adjustable supporting block is a square head bolt, the square head is in clearance fit with the T-shaped groove, and the fastening bolt can be limited in rotation freedom degree by being installed in the T-shaped groove. The adjusting bolt and the adjustable supporting block fastening bolt of the tool can limit the movement freedom degree of the adjustable supporting block at the same time. The tool is used in a group of two, so that the adjusting bolt of any tool in the group can be adjusted to align the workpiece, and the tool is convenient to use.

Drawings

FIG. 1 is a schematic diagram of a tooling for aligning a cross pin shaft of a low-speed diesel engine by a numerical control boring machine;

in the figure: 1-base, 2-adjustable supporting block, 3-fixed block, 4-adjusting bolt, 5-fixed block fastening bolt, 6-adjustable supporting block fastening bolt, 7-fastening nut.

Fig. 2 is a schematic front view of the tooling clamping cross pin of fig. 1;

in the figure: 2-frock, 9-cross pin axle, 10-workstation.

Fig. 3 is a left side view of fig. 2.

Fig. 4 is a schematic front view of a tool for aligning a cross pin shaft of a low-speed diesel engine by using a numerical control boring machine.

FIG. 5 is a schematic top view of a tooling for aligning a cross pin shaft of a low-speed diesel engine by using a numerical control boring machine.

Description of the embodiments

The implementation of the invention will be further described with reference to the accompanying drawings

The tool for aligning the cross pin shaft of the low-speed diesel engine by using the numerical control boring machine (the tool is short for the tool) shown in the attached drawing comprises a base 1, wherein the middle part of the upper surface of the base is provided with a boss which protrudes upwards and is in a longitudinal dovetail shape. The lower part of the two opposite adjustable supporting blocks 2 of the triangular frame is provided with a dovetail-shaped groove which is in movable fit with the boss, and the two opposite adjustable supporting blocks are arranged in movable fit with each other, so that a V-shaped structure is formed by the symmetrical inclined planes of the two opposite adjustable supporting blocks, and the V-shaped structure is shown in fig. 1. The upper surface of the base is also provided with a longitudinal T-shaped groove outside the two sides of the boss. The screw cap end of the fastening bolt 6 of the adjustable supporting block is embedded with a T-shaped groove in a movable fit manner. The upper end of the fastening bolt 6 passes through a corresponding connecting hole of the lower frame of the adjustable supporting block 2 to be matched and connected with the fastening nut 7. When the two adjustable supporting blocks 2 of the pair are sleeved on the boss, the lower end parts of the fastening bolts 6 also enter the T-shaped grooves. After the boss is preliminarily arranged, fixing blocks 3 can be respectively arranged at the two longitudinal end parts on the base. The fixed block is vertically provided with a connecting hole, a fastening bolt 5 penetrates through the connecting hole to be connected with a screw hole corresponding to the base in a matched mode, the fixed block is longitudinally provided with a screw hole, the screw hole is matched with an adjusting bolt 4, and the front end of the adjusting bolt is in contact with a corresponding adjustable supporting block. Thus, the position of the adjustable supporting block can be slightly adjusted by rotating the adjusting bolt 4. The tool comprises seven parts of a base, an adjustable supporting block, a fixed block, an adjusting bolt, a fixed block fastening bolt, an adjustable supporting block fastening bolt and a fastening nut.

a. The materials of the piece 1 and the piece 2 shown in the tool figure 1 are finished products of ductile cast iron machining, and the materials have the advantages of high strength and toughness, small deformation and good stability.

b. The fit clearance between the two side surfaces of the boss at the upper end of the piece 1 and the two side surfaces of the groove at the lower end of the piece 2 in the tooling of the invention shown in figure 1 is 0.02mm; the clearance between the top surface of the boss of the piece 1 and the bottom surface of the groove of the piece 2 is 0.5mm; the lower end surface of the piece 2 and the two side surfaces of the groove are contact surfaces with the corresponding surface of the piece 1, and the surface roughness of the contact surfaces is Ra1.6.

c. The tool is shown in a using state of fig. 2, after the tool (two groups) is placed at a proper position of a workbench 10 according to the length of a cross pin shaft 9 which is correspondingly processed, a fastening nut of a piece 7 is loosened, an adjusting bolt of a piece 4 is adjusted to the same length, then a workpiece is placed on an adjustable supporting block of the piece 2, the outer circle of the workpiece can be automatically attached to the supporting surface of the adjustable supporting block of the piece 2 by the weight of the workpiece, and then the tool is fixed on the workbench by using a pressing plate.

d. And measuring the height difference of the upper bus at the two ends of the rough grinding reference by using a dial indicator.

e. Adjusting the adjusting bolts of the piece 4 at any end of the left side and the right side of the figure 1 adjusts the height difference of the rough grinding references at the two sides to 0.

f. The pre-tightening piece 7 is used for fastening the nut, checking the height difference of the two ends of the rough grinding reference, and directly screwing the fastening nut if no change exists; and if the height difference of the two ends of the rough grinding is 0, screwing the fastening nut, and finally clamping the workpiece firmly.

J. After the upper bus is aligned, the side bus is aligned by the rotary workbench, so that the alignment process of the whole workpiece can be completed.

Claims

1. A tool for aligning the crosshead pin of a low-speed diesel engine on a CNC boring machine. It has a base, which is characterized in that: there is an upwardly protruding longitudinal dovetail-shaped boss in the middle of the upper part of the base, and two oppositely arranged triangular frame-shaped bosses. There is a dovetail-shaped groove on the bottom of the adjustable support block that matches the boss. The two opposite adjustable support blocks have symmetrical slopes to form a V shape; there are also longitudinal grooves on the base on both sides of the boss. T-shaped slot, the nut end of the fastening bolt of the adjustable support block is dynamically embedded in the T-shaped slot, the upper end of the fastening bolt passes through the corresponding connection hole of the lower frame of the adjustable support block and is connected with the fastening nut; the top of the base is longitudinal Fixed blocks are provided at both ends respectively. The fixed blocks have connecting holes vertically. The fastening bolts pass through the connecting holes and are matched with the screw holes corresponding to the base. The fixed blocks have screw holes longitudinally, and the screw holes are equipped with adjusting bolts. The front end of the adjusting bolt is in contact with the corresponding adjustable support block.

2. The tool for aligning the crosshead pin of a low-speed diesel engine on a CNC boring machine as claimed in claim 1, characterized in that: the base and the adjustable support block have a slideway type fit.

3. The tooling for aligning the crosshead pin of a low-speed diesel engine on a CNC boring machine as claimed in claim 1, characterized in that the base is designed with two T-shaped slots for installing the fastening bolts of the adjustable support block.

4. The tooling for aligning the crosshead pin of a low-speed diesel engine on a CNC boring machine as claimed in claim 1, characterized in that: the fastening bolts of the adjustable support block are square head bolts, and the square head and T-shaped groove are gaps. Fitting and installing in the T-slot can limit the rotational freedom of the fastening bolt.

5. The tool for aligning the crosshead pin of a low-speed diesel engine on a CNC boring machine as claimed in claim 1, characterized in that the adjusting bolt and the adjustable support block fastening bolt can simultaneously limit the freedom of movement of the adjustable support block.

6. The tooling for aligning the crosshead pin of a low-speed diesel engine on a CNC boring machine as claimed in claim 1, characterized in that: the tooling is used in a set of two, and the adjusting bolt of any one tooling in the group is adjusted and aligned. Positive workpiece.