2150, loader reducer housing parts face turning table design mechanical engineering and automation machine from 014 instructor Xiao Xueqin Xu Wubin Zhong Yan ring hole. The designed worktable is composed of the positioning clamping mechanism of the workpiece and the step positioning clamping mechanism of the turning component. The center of gravity of the turning component is on the flipping shaft, which makes the manual turning light light and fast, the worktable structure is simple and stable, the operation is flexible, and the maintenance period is stable. Long, good quality and cheap.
The introduction course shows that multi-station machine tools play an important role in the manufacturing of modern enterprises. This type of machine tool uses a multi-station multi-axis multi-faceted and multi-directional simultaneous machining of workpieces, resulting in high productivity. Since the workpiece is usually only required to be sub-clamped during processing, the machining accuracy is high. Multi-station of the machine tool, in addition to multi-axis simultaneous machining, can also use rotary or flip table, although the productivity and processing accuracy of rotary or rotary table instead of multi-axis simultaneous machining is not multi-axis simultaneous processing However, in the simple manufacturing process, the structure is simple, the manufacturing is convenient, the investment is small, and at the same time, it can overcome the shortcomings of inconvenient processing and ensuring the processing precision in the multi-axis machining, and thus is a modern enterprise manufacturing process + indispensable equipment. .
Background In the production line of the gearbox housing 1 of an engineering machinery factory, the hole on the surface is machined by the radial drilling machine. According to the current processing method, the upper part of the trolley 4 is positioned, especially the hole of the surface. Then the vehicle is hoisted, the second positioning processing, and then the vehicle is hoisted, the third positioning, processing is completed, the workpiece is hoisted and another unprocessed workpiece is loaded at the same time, so it takes 4 times to use the vehicle, which wastes a lot of waiting. The time has formed a production bottleneck, and at the same time, the butyl parts are also compared, and 98.81 is inconvenient to use the vehicle to turn over. The positioning of the clips also adds a lot of auxiliary time. Therefore, for this part, a table is designed to be turned over by 180. The shaken 1 bed can be used to slant 45 holes, and the processed parts can be smashed with blood 2 holes and inverted peripheral holes. Adding one workpiece in a random manner, only the second clamping, can alleviate the pressure of using the driving, solve the bottleneck of driving, and improve productivity.
The solution determined by the solution design is designed to be flipped by the design, so that each angle required by the workpiece can be added and simultaneously. 1. Perform dimensional design on the entire work, determine its quality, and complete the overall layout of the workbench. The basic requirements of the I-turning workbench The workbench design requirements are convenient for workers to operate and ensure work safety without affecting the normal working efficiency of workers. According to the actual situation of production, the basic requirements of the design are put forward.
It must be cyclic, that is, after the workpiece is processed, it is not necessary to flip the workpiece and replace the tool, and the vehicle can be directly replaced with another workpiece processing such as the cabinet 2; the axis stroke is 400, the hand wheel rotates the circumference, and the workpiece is convenient for 7 The angle of rotation of the processing hand wheel is smaller than the maximum height difference of the existing processing surface. The workpiece is manually turned over, and the quality of the inverted part should be less than 3000. The positioning and clamping steps of the workpiece should be completed. It may be simplified; 4 Due to the busy production tasks in the factory, the material of the workbench should be steel as much as possible to save production casting time.
The positioning of the workpiece and the clamping principle of the workpiece The workpiece adopts the one-side and two-pin positioning principle to limit the six degrees of freedom of the workpiece; the clamping of the workpiece is to form a side hook-shaped pressing plate at a fixed angle; the degree of freedom of rotation around the rotating shaft It is limited by the tapered pin; the jack that can be quickly raised and lowered is used to support the overhanging part of the workpiece, which prevents the person from adding, and the force causes the positioning jaw to be stuck and the horizontal position of the added surface is ensured.
The working principle of the turning table is to use manual turning. The workpiece is hung on the table according to the requirements. Three pressure plates are rotated to press the workpiece. The nut is tightened with a wrench, and the hole can be directly processed. After processing, After removing the drill bit and quickly moving the jack down a certain distance, pull out the tapered pin. While pulling, hold the rotating handle or workpiece with your hand, then turn the workpiece 180, reach the position, insert the tapered pin to position, and then move the jack. Change the hole on the second side of the tool. After the machining is finished, remove the drill and remove the jack and pull out the tapered pin. Turn back the table 90, insert the pin and carry the jack, change the tool to machine the workpiece, and use the wrench after processing. Loosen the hook-shaped pressure plate, use the driving to lift the workpiece and load another workpiece, so that the 掀 ring can be added, and the average machining of each workpiece 1 is changed twice.
The structure design of the workbench is divided into one step according to different parts of the workpiece in order to make the juice and the calculation.
The center of the parameter surface of the design is the origin, and the position of the center of gravity of the workpiece is 6.6, 69.47182.1, the direction of the workpiece 2 is 290, the length of the facet 1 is 591, the width is 591, and the working face is the lowest when drilling 1 hole. The working face is the highest when the hole is 45. When the hole is in the horizontal position, the distance from the working surface to the center of the middle 136 hole is 2561 丽. The hole diameter of the 1 leg 1 is required to be 321. The length of the through hole is 321 and the depth from the bottom surface is 50. The distance between the two positioning holes is 234. According to the reference book, 3141014, the machine model number is 2306, and the maximum drilling diameter is 631 丽. The distance from the center line of the main shaft to the surface of the column is 450 fly and 2 000 axes. From the west to the pain
Seat, the distance from the west to the pain is 400, and the stroke of the spindle is 4, 16, and the spindle speed is 20,1 600. The speed is 16 and the feed is 0.04, 3.2. The horizontal movement distance of the headstock is 1550, the swing angle of the rocker arm is 360 in the horizontal plane, the maximum feed force is 25 00, and the maximum twist rejection is 1.1. The main motor capacity is 3. The tool parameters used for the hole are the tools currently used, and the material is high speed. Steel, the length of the drill bit is 30, 擂, the pound is changed to 1 small hole. The length of the boring tool is 4701 锪屯 20 chamfering. The length of the boring tool is 28, and the length of the clamping part of the tool is about the same. However, depending on the processing needs, the length of the shank can be increased.
The design of the positioning and clamping mechanism includes the arrangement of the workpiece. The position of the rotating shaft. The positioning of the positioning plate. The positioning of the design of the mandrel. The design of the bolt set. The design of the design of the hook-shaped pressure plate. The design of the design of the base is designed. And positioning cone cutting design.
The workpiece is arranged according to 45, the workbench is on the right side of the machine tool, the axis is selected to be placed on the bottom of the machine, and the direction is 4, 2, the direction is 30 from the center, and the thickness of the bottom plate is 30. The material is 45 steel, which is a welded piece, according to The contour of the workpiece is designed so that the position of the hook-shaped pressure plate is pressed by three points, and the bottom plate of the hook-shaped pressure plate is wider than the workpiece. 5, additionally welding the rotating shaft support seat, according to the need to open the process hole and the joint weight; the positioning mandrel is bolted to make it fast and easy to operate the stepped shaft, with double bearing support, with bearing cover and block The plate is fixed to the shaft; the base design is also welded, and the machine structure is connected with the machine tool by bolts with a slotted slot.
According to the design and processing conditions, the jack 4 can be quickly raised and lowered, and has a screw nut holder cup base and a lower handle. The screw is opened on the screw, and the pin is used to form the point line pair. The screw can only rise or fall straight. The positioning taper pin with better surface roughness is selected according to the reference book 7142143, and the distance from the rotating shaft is 1501.
Checking the strength in a station, each tool feed force 1 jack set; 2 screw; 3 handle; 4 pin; 5 pedestal borehole 20 force far away people 10 other processing time force, fire this, drilling Force analysis. Among them, the check of =2 strength includes the check of the spindle shaft bolt group, the hooking plate rotating plate assembly positioning cone pin and the jack. In the process of checking, the force of the single position is compared. Finally, take the time to check the most.
The economic analysis of the workbench and the performance analysis of the use of the workbench, the fundamental purpose is to obtain good economic benefits, so the design workbench and other technical tricks, not only a technical question. And 1 foot economy 1. Design workbench; thick technical and economic analysis. Get the best results from your design. Accuracy design economic analysis Because the positional accuracy required for boring and chamfering is not high in the whole process, the processed hole milk is a common oil hole, and there is no great requirement in accuracy, so the positioning of the workpiece The accuracy requirement is not high, so that it is known that the stability of the workbench requires that the precision of the workbench is not very high; and the strength check is passed. It can be seen that the force of the tool on the table during the addition of the machine is far less than ten. The worktable can withstand the economic analysis of the structural design. The criterion for selecting the structural scheme is to make the structural design and production program of the designed fire tool gray. It is impossible to pursue advanced and efficient. For fixtures used in high-volume production lines, when selecting a structural scheme, the labor-saving and time-saving high-efficiency fixtures should be selected based on the production cycle of the workpiece. The shell production line beat is 9 minutes and the production program is 2000 pieces. After analysis, after manually turning the workbench, the economic benefit is that the output can reach 64 pieces. The machining time of each workpiece can be saved for 4 minutes, and the productivity can be increased. 13. Therefore, hydraulic power clamping and rotation are not required.
The performance of using performance analysis is primarily flip performance. After the dimension is calculated, the center of gravity of the rotating component is calculated, and the center of gravity is seen on the flip axis.
Since it is a manual flip, a flip performance analysis is required. Due to the casting error of the shell blank, there is also an error in the manufacture of the table, resulting in the center of gravity of the rotating part of the table being offset from the axis of rotation after the part is mounted. Assuming that the distance between the center of gravity of the blank and the distance from the rotary axis to the distance from the center of the handle to the center of rotation is 250, the deviation of the mass error from the center of gravity is 1.78. Considering the difference in the manufacturing of the table itself, the deviation from the rotational axis is determined. U=250mm; designed swivel part weight M 280 When the workpiece rotates 90, stop the force is 1=54.88.
The axle quasi-support has frictional force, the mountain reference 1 is, the 7207.2 has the rolling friction coefficient = 0.02, 0., and the acting force of the side is 4.82. When the center of gravity of the rotating component deviates from the axis 5, the force required to flip the part is suppressed. . =1+2=69.7 than the assumed turning force is 4 24.38N, L=2.2mm; therefore, it is necessary to adjust the center of gravity of the turning part to the turning axis distance L=2, 2mm 1 person at the time of detection.
1 Xu Wei. Mechanical design manual touch. Beijing Mechanical Industry Press, 1988.
2 Meng Lingong. Mechanical plus art hand North Machinery Industry Edition Khan.
3 Northeast Heavy Driving Angers School Luoyang Agricultural Machinery 71 Changchun Automobile is owed to school. Machine ice fixture design 1. Shangcai; 咐 (eight) Zhang Yiping called the national standard of standards to publish the standard of sweat.
5 濮 expensive, Ji Ming just. The mechanical setting is 1 with. North Higher Education publishes Khan.
1. Pei, He Xiaohua mechanical set, set up 4. Beijing Gao Ting Ting published Khan.
The theory of Hari code industry is to teach and study the mechanics of the North.
2 Liu Qizhong. Wait. Modern CNC technology and Yingshan 1. Beijing Machinery. 1 industry press. 2 3 Xu Wei. Mechanical juice, book buckle. Beiqi Machinery Industry Press. 1995.
4 Wu Zonghan. Mechanical Parts Juice Handbook 1. Beihe Machinery Industry Press. 2003.
51 machine milk book writing group. The machine is called a book. Booklet. Beijing Machinery Industry Press. 19867.
6 mechanical 1 wish, the book editor can be swallowed. Mechanical aging manual elbow. north! ; Mechanical Press 989.
