CN216990881U

CN216990881U - Machining center rotary positioning mechanism

Info

Publication number: CN216990881U
Application number: CN202122876516.0U
Authority: CN
Inventors: 胡海波; 杨荣国; 王永军; 韩小晨; 钱晨晨; 李明芳; 段其红
Original assignee: Shanxi Pingyang Industry Machinery Co Ltd
Current assignee: Shanxi Pingyang Industry Machinery Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-07-19
Anticipated expiration: 2031-11-23

Abstract

The utility model relates to the technical field of machining of a radial hole of an outer circle of a shell by gantry machining center equipment without a rotary table, in particular to a rotary positioning mechanism of a machining center. Aiming at gantry machining center equipment without a rotary table, the technical problem of processing multiple radial holes in the outer circle and the inner cavity of a shell part is solved. A rotary positioning mechanism of a machining center comprises a chassis, a positioning disc, a pressure plate, a rotating shaft, a screw and a positioning pin; the center of the chassis is provided with a shaft hole, and the surface of the chassis is provided with a plurality of pin holes around the center; the center of the positioning disc is provided with a shaft hole, the outer ring of the boss on the positioning disc is provided with a plurality of screw holes and at least one pin hole around the center, the centers of the screw holes and the pin holes are positioned on the same circle, and the diameter of the circle is the same as that of the pin hole on the chassis; the pressure disk center is opened there is the through-hole, surrounds the through-hole on the pressure disk and opens the screw that has the same quantity with screw quantity on the positioning disk.

Description

Machining center rotary positioning mechanism

Technical Field

The utility model relates to the technical field of machining of a radial hole of an outer circle of a shell by gantry machining center equipment without a rotary table, in particular to a rotary positioning mechanism of a machining center.

Background

At present, when the inner cavity radial hole of a shell part is machined, the axial size of the shell is long, and the inner cavity radial hole is close to the end face of the shell, so that the conventional method cannot machine the inner cavity radial hole due to the limitation of the stroke of a gantry machining center.

Specifically, the gantry machining center mainly has the following defects in the aspect of machining an ultra-long shell:

1) radial holes uniformly distributed on the shell parts exceeding the stroke cannot be machined on the rotary table;

2) and the radial holes are respectively processed by using the scribed lines, the scribed lines need to be aligned in the processing of each hole, and the holes need to be clamped for many times, so that the processing error is large and the efficiency is low.

Disclosure of Invention

The utility model provides a rotary positioning mechanism of a machining center, aiming at the technical problems of processing of a plurality of radial holes on the outer circle and the inner cavity of a shell part of gantry machining center equipment without a turntable, and aiming at solving the technical problems of the gantry machining center in processing of an ultra-long shell.

The utility model is realized by adopting the following technical scheme: a rotary positioning mechanism of a machining center comprises a base plate, a positioning plate, a pressure plate, a rotating shaft, a screw and a positioning pin; the center of the chassis is provided with a shaft hole, the surface of the chassis is provided with a plurality of pin holes around the center, the centers of the pin holes are positioned on the same circle, and one corner of the bottom of the chassis is horizontally cut to form a bottom platform; the center of the positioning disc is provided with a shaft hole, one side of the positioning disc is provided with a boss structure, the positioning disc is provided with a plurality of screw holes and at least one pin hole around the center outside the boss, the centers of the screw holes and the pin holes are positioned on the same circle, and the diameter of the circle is the same as that of the pin hole on the chassis; the center of the pressure plate is provided with a through hole, the pressure plate is provided with screw holes surrounding the through hole, the number of the screw holes is the same as that of the screw holes on the positioning plate, and the diameter of a circle where the screw holes on the pressure plate are located is the same as that of a circle where the screw holes on the positioning plate are located; the number of the screw rods is the same as that of the screw holes, and the screw rods are connected with the positioning plate and the pressure plate through the screw holes on the positioning plate and the pressure plate so as to clamp the shell to be processed; the rotating shaft penetrates through a shaft hole between the chassis and the positioning plate, and pin holes in the chassis and the positioning plate are connected and positioned through positioning pins.

The pin holes on the chassis are pre-machined according to the radial holes on the shell, and the number and the angle are designed according to the radial holes on the shell. When the positioning device is used for machining, the base plate is placed on a gantry machining center workbench through a bottom platform of the base plate and is fixed, the positioning plate is connected with the base plate through a rotating shaft, a shell to be machined is arranged between the positioning plate and the pressure plate after alignment, the boss of the positioning plate clamps the inner cavity wall at one end of the shell, the other end of the shell is sleeved by the central through hole of the pressure plate, and then the pressure plate is connected with the positioning plate through a screw rod, so that the shell to be machined can be positioned. And then the positioning plate and the chassis are connected and fixed through the positioning pin, so that the position of the shell is fixed, and the drill bit of the gantry machining center can realize punching in the radial direction of the shell. And after the first hole is punched, rotating the corresponding angle and punching the second hole until all the holes are punched. Because the pin hole on the chassis is processed in advance according to the radial hole to be processed on the shell, the next radial hole can be processed as long as the first radial hole is processed after the position is determined, and the positioning disc is rotated by a specific angle. The screw holes and the pins on the positioning disc are positioned on the same circle, so that the positions of the pin holes and the screw holes can be guaranteed to be staggered, and the screw rods and the positioning pins are not interfered with each other.

The utility model realizes the following technical effects by designing the rotary positioning mechanism of the machining center:

1) the shell is clamped once, the processing of the radial holes of the outer circle and the inner cavity of the shell is completed, the time for clamping for multiple times is saved, and the processing efficiency is improved;

2) the processing of all radial holes is finished by one-time clamping and alignment, the alignment error is reduced, and the processing precision of each radial hole of the outer circle and the inner cavity of the shell is improved;

3) the processing range of the processing center is enlarged.

Drawings

FIG. 1 is a schematic view of radial holes machined in both ends of a shell.

Fig. 2 is a schematic view of a machining center rotational positioning mechanism with a housing installed.

Fig. 3 is a schematic front view of a base plate of a rotational positioning mechanism of a machining center.

Fig. 4 is a side view of fig. 3.

Fig. 5 is a schematic front structure view of a positioning plate of a rotation positioning mechanism of a machining center.

Fig. 6 is a side view of fig. 5.

FIG. 7 is a schematic view of a pull rod structure of the rotation positioning mechanism of the machining center.

Fig. 8 is a schematic view of a structure of a rotating shaft of the machining center rotating and positioning mechanism.

FIG. 9 is a schematic view of a rotary pressing disk structure of the rotary positioning mechanism of the machining center.

Fig. 10 is a side view of fig. 9.

1-chassis, 2-positioning disc, 3-pressing disc, 4-rotating shaft, 5-screw, 6-positioning pin, 7-pin hole, 8-bottom platform, 9-screw hole, 10-lightening hole and 11-shell.

Detailed Description

Embodiment 1 as shown in fig. 2 to 10, a machining center rotational positioning mechanism includes a base plate 1, a positioning plate 2, a platen 3, a rotary shaft 4, a screw 5, and a positioning pin 6; the center of the chassis is provided with a shaft hole, the surface of the chassis is provided with a plurality of pin holes 7 around the center, the centers of the pin holes 7 are positioned on the same circle, and a bottom platform 8 is formed by horizontally cutting one corner at the bottom of the chassis; the center of the positioning disc 2 is provided with a shaft hole, one side of the positioning disc 2 is provided with a boss structure, the outer periphery of the boss on the positioning disc 2 is provided with a plurality of screw holes 9 and at least one pin hole 7, the centers of the screw holes 9 and the pin holes 7 are positioned on the same circle, and the diameter of the circle is the same as that of the circle where the pin holes 7 on the chassis 1 are positioned; a through hole is formed in the center of the pressure plate 3, screw holes 9 which are the same in number as the screw holes in the positioning plate 2 and correspond to the screw holes in one-to-one position are formed in the pressure plate 3 around the through hole, and the diameter of a circle where the screw holes 9 in the pressure plate 3 are located is the same as that of a circle where the screw holes 9 in the positioning plate 2 are located; the number of the screw rods 5 is the same as that of the screw holes 9, and the screw rods 5 are connected with the positioning disc 2 and the pressure disc 3 through the screw holes 9 on the positioning disc and the pressure disc to clamp a shell to be processed; the rotating shaft 4 penetrates through a shaft hole between the chassis 1 and the positioning plate 2, and pin holes 7 in the chassis 1 and the positioning plate 2 are connected and positioned through positioning pins 6.

Embodiment 2 as shown in fig. 3 and 4, the number of the pin holes 7 on the chassis 1 is 6, wherein two pin holes 7 are distributed on the vertical center line (one above and one below) of the chassis 1. The 6 pin holes are distributed according to the interval of 60 degrees and are the same as the radial holes to be processed.

Embodiment 3 as shown in fig. 3, the pin holes 7 further include four holes arranged at 20 degrees on the upper and lower sides and at 15 degrees on the upper and lower sides of the horizontal center line of the base pan 1. The pin holes can meet the processing requirements of other radial holes in different distribution of the shell.

Embodiment 4 as shown in fig. 5, the positioning plate 2 has four screw holes 9, which are distributed at equal intervals of 90 degrees, and one pin hole 7, which is located between two screw holes 9 and is at an interval of 45 degrees from the two screw holes 9. Thus, the screw hole and the pin hole are not interfered with each other. The number of pin holes in fig. 7 is also four.

Embodiment 5 as shown in fig. 3 and 5, a plurality of lightening holes 10 are formed on the chassis 1 around the center thereof, and a plurality of lightening holes 10 are also formed on the boss of the positioning plate 2 around the center thereof, so that the weight of the positioning plate and the chassis can be reduced.

The inner diameter of the axle hole on the positioning plate 2 is larger than that of the axle hole on the chassis 1; the section of the rotating shaft 4 is in a convex shape and is matched with the two shaft holes, so that the rotating shaft is not easy to fall off, and the edge is chamfered by 20 degrees of oblique angle and is not easy to damage. The diameter of the boss of the positioning plate 2 is the same as the inner diameter of the through hole of the pressure plate 3. The positioning pin 6 is a diamond pin. The distance between the bottom platform 8 of the chassis 1 and the center of the chassis 1 is 300mm, and the diameter of the circle where the pin hole 7 is located is 540 mm. The inner diameter of the shaft hole on the positioning disc 2 is 80mm, and the inner diameter of the shaft hole on the chassis 1 is 60 mm.

As shown in figure 1, a shell of a certain product is made of titanium alloy TA4, the outer diameter of the shell is phi 500mm, the total length of the shell is 1520mm, two ends of the shell are respectively provided with a group of threaded blind holes of 6-M8-7H, the distance from the end face is 73mm, the processing on a self-contained turntable is not limited by the Z-axis stroke of a gantry processing center, the other radial holes of an inner cavity are processed, angular orientation determination of the two groups of threaded holes is a difficult problem to solve in the processing process due to the angular orientation relation among the holes of the inner cavity, and the 6-M8-7H threaded holes at each end are completely processed at one time according to the requirement of an assembly relation.

Through analyzing the structure of the shell and the position of the radial hole, according to the structural characteristics of the shell, the shell needs to be processed on a gantry machining center device, the dimensional relation of two groups of 6-M8-7H of threaded blind holes in inner cavities at two ends of the shell is analyzed through research, the shell is processed on a self-contained rotary table, the radial hole exceeds the stroke of a Z axis of the gantry machining center, the radial hole cannot be processed, if the shell is arranged on a rectangular workbench of the gantry machining center, an angular position groove of the radial hole needs to be marked on the shell in advance, and each hole is processed and centered once again through clamping, the processing efficiency is low, the alignment error is accumulated and increased, and the angular precision of the processed radial hole is low.

Therefore, in order to improve the processing precision and the processing efficiency of the radial hole of the shell and reduce the alignment error, a rotary positioning mechanism (shown in figures 2-10) of the processing center is designed by analyzing the structure of a rotary table of the processing center and referring to a related rotary table mechanism design manual, and the processing of two groups of threaded blind holes 6-M8-7H of inner cavities at two ends of the shell is completed on a rectangular workbench of the gantry processing center by utilizing the angular positions of the processed radial holes and rotating the rotary positioning mechanism.

The working process of the utility model in specific application is as follows:

1. firstly, a machining center rotating and positioning mechanism shown in fig. 2 is designed according to the position relation of each radial hole in an inner cavity of a shell.

2. After the other holes of the inner cavity of the shell are machined, lines are scribed on the excircle of the shell for subsequent use in a fixed angle direction.

3. According to the designed rotary positioning auxiliary tool, a chassis is fixed on a gantry machining center workbench, the rotary positioning auxiliary tool is aligned, a shell is arranged in a positioning disc, a scribed line on an excircle is aligned, the positioning disc and the chassis are fixed by using a diamond pin, a M8-7H threaded blind hole is machined, the diamond pin is pulled out after machining is finished, the positioning disc is rotated to another position, the positioning disc and the chassis are fixed by using the diamond pin again, another M8-7H threaded blind hole is machined, and the steps are repeated until 6M 6-7H threaded blind holes are machined.

Through twice clamping and alignment, the processing of 6-M6-7H thread blind holes at two ends of the inner cavity of the shell is smoothly completed, the processing technical problem is solved for a company, 10 pieces of shells are processed in total at the time, the sizes of the 10 pieces of shells all meet the requirements of drawings, products are successfully delivered to customers, and abundant processing experiences are accumulated for subsequent processing of the shell structure.

The design of the rotary positioning mechanism improves the processing precision and the processing efficiency of the radial hole of the shell.

A plurality of positioning holes can be designed according to actual conditions on the chassis, and the included angle between the positioning holes is determined according to the condition of the shell to be processed so as to meet the requirements of processing radial holes of different shells.

This independently design rotational positioning mechanism has got rid of the restriction of longmen machining center Z axle stroke, realizes that a clamping accomplishes whole processing to casing inner chamber one end radial hole, has reduced clamping time and alignment number of times, has improved machining precision and efficiency.

Claims

1. A rotary positioning mechanism of a machining center is characterized by comprising a base plate (1), a positioning plate (2), a pressure plate (3), a rotating shaft (4), a screw (5) and a positioning pin (6); a shaft hole is formed in the center of the chassis (1), a plurality of pin holes (7) are formed in the surface of the chassis (1) around the center of the chassis, the centers of the pin holes (7) are located on the same circle, and a bottom platform (8) is formed by horizontally cutting one corner at the bottom of the chassis (1); the center of the positioning disc (2) is provided with a shaft hole, one side of the positioning disc (2) is provided with a boss structure, a plurality of screw holes (9) and at least one pin hole (7) are formed in the boss outer ring of the positioning disc (2) around the center, the centers of the screw holes (9) and the pin holes (7) are located on the same circle, and the diameter of the circle is the same as that of the circle where the pin holes (7) are located on the chassis (1); a through hole is formed in the center of the pressure plate (3), screw holes (9) with the same number as that of the screw holes in the positioning plate (2) are formed in the pressure plate (3) in a manner of surrounding the through hole, and the diameter of a circle where the screw holes (9) in the pressure plate (3) are located is the same as that of a circle where the screw holes (9) in the positioning plate (2) are located; the number of the screw rods (5) is the same as that of the screw holes (9), and the screw rods (5) are connected with the positioning plate (2) and the pressure plate (3) through the screw holes (9) on the positioning plate and the pressure plate to clamp a shell to be processed; the rotating shaft (4) penetrates through a shaft hole between the chassis (1) and the positioning disc (2), and pin holes (7) in the chassis (1) and the positioning disc (2) are connected and positioned through the positioning pins (6).

2. The machining center rotational positioning mechanism according to claim 1, characterized in that the number of the pin holes (7) on the base plate (1) is 6, and two of the pin holes (7) are distributed on the vertical center line of the base plate (1).

3. The machining center rotational positioning mechanism according to claim 2, characterized in that the pin hole (7) further comprises four holes distributed at 20 degrees on the upper and lower sides and at 15 degrees on the upper and lower sides of the horizontal center line of the base plate (1).

4. Machining center rotational positioning mechanism according to any of claims 1-3, characterized in that the positioning plate (2) has four screw holes (9) equally spaced from each other, and one pin hole (7) is located between two of the screw holes (9) and at 45 degrees from the two screw holes (9).

5. The machining center rotating positioning mechanism according to any one of claims 1 to 3, characterized in that a plurality of lightening holes (10) are formed on the base plate (1) around the center thereof, and a plurality of lightening holes (10) are also formed on the boss of the positioning plate (2) around the center thereof.

6. The machining center rotary positioning mechanism according to any one of claims 1 to 3, wherein the inner diameter of the shaft hole of the positioning plate (2) is larger than that of the shaft hole of the base plate (1); the section of the rotating shaft (4) is in a convex shape and is matched with the two shaft holes.

7. The machining center rotational positioning mechanism according to claim 6, characterized in that the diameter of the boss of the positioning plate (2) is the same as the inner diameter of the through hole of the pressure plate (3).

8. Machining center rotational positioning mechanism according to any of claims 1-3, characterized in that the positioning pin (6) is a diamond pin.

9. The machining center rotational positioning mechanism according to any one of claims 1 to 3, characterized in that the distance from the bottom platform (8) of the base plate (1) to the center of the base plate (1) is 300mm, and the diameter of the circle on which the pin hole (7) is located is 540 mm.

10. The machining center rotary positioning mechanism according to claim 7, wherein the inner diameter of the shaft hole of the positioning plate (2) is 80mm, and the inner diameter of the shaft hole of the base plate (1) is 60 mm.