CN202399059U - Clamp for fine boring of large and small end holes of connecting rod - Google Patents

Abstract

A precision boring fixture for connecting rods with large and small holes uses a locating pin and a locating block for positioning at the large end. The large-end locating pin is a short, chamfered pin placed in the large-end hole, controlling one degree of freedom. The small-end locating pin is a short, round pin, controlling two degrees of freedom. A hydraulic cylinder at the large end presses a floating pressure plate at the large end, thereby pressing the large end of the connecting rod. A hydraulic cylinder at the small end drives a floating pressure plate at the small end to press a pressure ring at the small end, thereby pressing the small end of the connecting rod. This controls three degrees of freedom, allowing for complete positioning of the connecting rod across six degrees of freedom. The advantages of this invention are its simple design, accurate positioning, and convenient operation. The entire process is controlled by a machine tool program, resulting in a high degree of automation. It is particularly suitable for connecting rods without side locating surfaces. It also has strong versatility, meeting the needs of producing different types of connecting rods.

Description

Connecting Rod Fine Boring Large and Small End Hole Fixtures

technical field

The utility model relates to the field of automobile connecting rod processing, in particular to a jig for fine boring large and small end holes of connecting rods.

Background technique

The fine boring process of the large and small end holes of the automobile connecting rod is carried out by a vertical machining center, which can be manually moved up and down, and six pieces can be processed at a time, and the small end hole, the large end positioning surface (side), and the connecting rod end surface are used for complete positioning. In the prior art, the small end of the connecting rod is positioned with a short positioning pin to control the X and Y directions of the connecting rod, limiting two degrees of freedom of the workpiece. The disadvantage of this scheme is that the side positioning surface must be processed before finishing the large and small end holes, which is used for processing and positioning in the subsequent process. The surface cannot be accurately positioned, so a new fixture needs to be designed to meet the needs of fine boring of the large and small end holes of the connecting rod.

Utility model content

The utility model provides a jig for fine boring large and small end holes of a connecting rod, which can solve the problem of inaccurate positioning during fine boring of the large and small end holes of the connecting rod.

In order to achieve the above purpose, the following technical solutions are adopted:

A jig for fine boring large and small end holes of a connecting rod, comprising a connecting rod, a hydraulic cylinder and a positioning component, the positioning component comprising a large-end positioning pin, a small-end positioning pin, a large-end positioning block, and a small-end positioning block, the connecting rod The large and small ends of the large end positioning block are respectively placed under the large end positioning block and the small end positioning block. The large end positioning block is connected to the large end hydraulic cylinder through the large end pressure plate and the large end hydraulic cylinder pull rod, and the small end pressure plate is connected to the small end hydraulic cylinder pull rod. The small end hydraulic cylinder has a floating pressure plate on the big end positioning block, a small end pressure ring on the small end positioning block, the floating pressure plate is connected with the large end hydraulic cylinder pull rod through the large end pressure plate, and the small end pressure ring is connected to The small-end hydraulic cylinder tie rod connection; the large-end positioning pin and the small-end positioning pin are respectively placed in the large and small end holes to position the connecting rod, and the large-end positioning pin and the small-end positioning pin are connected to the respective driving cylinders through the cylinder rod. The positioning pin at the large end is a short chamfering pin, and the positioning pin at the small end is a short round pin.

As a preferred solution, the devices for positioning the large end of the compression link are fixed on the top and back of the upper plate of the large end, and the devices for positioning the small end of the compression are fixed on the top and back of the upper plate of the small end. The plate and the small end upper plate are connected with the rib plate, the rib plate is connected with the bottom plate, and the bottom plate is fixedly connected with the guide rail of the machine tool.

As a further preferred solution, the upper plate at the large end is fixedly connected to the rib plate with screws; the upper plate at the small end and the rib plate are fixed by a U-shaped long hole whose distance can be adjusted.

As a further preferred solution, a U-shaped structure is used for connection between the floating pressure plate that presses the large end of the connecting rod and the large end pressure plate, and between the small end floating pressure plate and the small end pressure ring.

The utility model has the advantages of simple structure, easy realization and low cost. Because it adopts positioning pins at the large and small ends, the fixture design is simple, the positioning is accurate, and the operation is convenient. The two positioning pins are automatically positioned, and then returned for compression. Both are controlled by machine tool programs, with a high degree of automation, and are very suitable for connecting rods without side positioning surfaces; the two upper plates are fixed with U-shaped long holes, and the center distance can be adjusted for connecting rods with different center distances. After the spring collar is removed, it can be easily replaced to meet the needs of producing different types of connecting rods, and has strong versatility.

Description of drawings

Below according to embodiment and accompanying drawing, the utility model is described in further detail.

Fig. 1 is the front view of the utility model embodiment;

Fig. 2 is a side sectional view of Fig. 1;

Fig. 3 is a partial sectional view of the small end in Fig. 2;

In the picture:

1. Small end upper plate; 2. Bottom plate; 3. Rib plate; 4. Big end upper plate; 5. Hydraulic cylinder; 6. Big end copper sleeve; 7. Hydraulic cylinder tie rod; 8. Big end pressure plate; 9. Hydraulic Cylinder hinge piece; 10. Big end hydraulic cylinder support; 11. Big end floating pressure plate; 12. Big end positioning block; 13. Big end positioning pin; 14. Connecting rod; 15. Cylinder; 16. Cylinder connecting rod; 17 , Cylinder block; 18, positioning pin guide sleeve; 19, large end seat gold; 20, small end positioning pin; 21, small end pressure ring; 22, small end pressure plate.

Detailed ways

As shown in Figures 1 to 3, a specific embodiment of the present utility model is provided, among the figures,

A connecting rod fine boring jig for large and small holes, the connecting rod 14 is placed under the large end positioning block 12 and the small end positioning block, the large end positioning pin 13 and the small end positioning pin 20 are raised to position the connecting rod 14, and then the large end positioning The end floating pressing plate 11 and the small end pressing ring 21 are pressed tightly, and at this moment, the large end positioning pin 13 and the small end positioning pin 20 are retreated, and the positioning is completed. The big-end positioning block 12 and the small-end positioning block belong to the positioning surface positioning and control 3 degrees of freedom. The small-end positioning pin 20 is a short round pin and controls 2 degrees of freedom. The large-end positioning pin 13 is a short-cutting pin to control 1 Degree of freedom, 6 degrees of freedom can completely position the connecting rod.

The big end positioning and pressing part includes: big end positioning block 12, big end positioning pin 12, cylinder 15, cylinder connecting rod 16, cylinder pad 17, positioning pin guide sleeve 18, big end seat gold 19, etc., cylinder connecting rod 16 It is threadedly connected with the cylinder 15, and the other end of the cylinder connecting rod 16 is rigidly connected with the large end positioning pin 13, and is fixed with a hexagon socket head cap bolt. The big end positioning block 12 and the big end seat gold 19 are fixed on the big end upper plate 4, the cylinder 15 and the cylinder pad 17 are fixed on the back of the big end upper plate 4, and the positioning pin guide sleeve 18 is used to guide and protect the cylinder connecting rod 16 . The rising of the cylinder 15 drives the cylinder connecting rod 16 and the big end positioning pin 12 to lift and locate, and return after the positioning is completed, and the whole process is controlled by the machine tool program. The big-end pressing device includes: hydraulic cylinder 5, hydraulic cylinder pull rod 7, big-end pressure plate 8, big-end hydraulic cylinder support 10, big-end floating pressure plate 11, hydraulic cylinder hinge piece 9, and matching copper sleeve and spring collar etc., the big-end floating pressure plate 11 is fixed on one end of the big-end pressure plate 8 with a spring collar, the other end of the big-end pressure plate 8 is connected with the hydraulic cylinder pull rod 7, the hydraulic cylinder pull rod 7 is rigidly connected with the hydraulic cylinder 5 thread, and the hydraulic cylinder 5 drives The hydraulic cylinder pull rod 7 rises to make the big-end floating pressure plate 11 be pressed tightly. The hydraulic cylinder 5 drives the hydraulic cylinder pull rod 7 to retreat. Compression and lifting are also controlled by the machine tool program. The two ends of the hydraulic cylinder hinge plate 9 are respectively connected with the large end pressure plate 8 and the large end hydraulic cylinder support 10 for stabilizing and positioning the large end pressure plate 8 . The positioning and compression principle of the small end is the same as that of the large end.

As shown in Figures 1 and 2, the devices for positioning the large end of the compression link are fixed on the top and back of the upper plate 4 at the large end, and the devices for positioning the small end are fixed on the top and back of the upper plate 1 at the small end. On the back, the upper plate 1 and the upper plate 2 are connected with the rib plate 3, and the rib plate 3 is connected with the bottom plate 2, and the bottom plate 2 is fixed with the guide rail of the machine tool. The small end upper plate 1 and the rib plate 3 are fixed with screws and cannot be moved to change the position; while the large end upper plate 2 and the rib plate 3 are connected by long holes, the distance can be adjusted, and they are used to process different types of connecting rods. The reason why the big-end compression is designed as the big-end floating pressure plate 11 and the big-end pressure plate 8, and the big-end floating pressure plate 11 is still a U-shaped structure is to balance the force; the small-end pressure ring 21 and the small-end pressure plate 22 are also the same reason.

The utility model has the advantages of simple structure, easy realization and low cost. Because it adopts positioning pins at the large and small ends, the fixture design is simple, the positioning is accurate, and the operation is convenient. The two positioning pins are automatically positioned, and then returned for compression. Both are controlled by machine tool programs, with a high degree of automation, and are very suitable for connecting rods without side positioning surfaces; the two upper plates are fixed with U-shaped long holes, and the center distance can be adjusted for connecting rods with different center distances. After the spring collar is removed, it can be easily replaced to meet the needs of producing different types of connecting rods, and has strong versatility.

Claims (4)

1. A connecting rod fine boring clamp for large and small end holes, comprising a connecting rod, a hydraulic cylinder and a locating component, the locating component comprising a large end locating pin, a small end locating pin, a large end locating block, a small end locating block, the The large and small ends of the connecting rod are respectively placed under the large end positioning block and the small end positioning block. The large end positioning block is connected to the large end hydraulic cylinder through the large end pressure plate and the large end hydraulic cylinder pull rod, and the small end pressure plate is passed through the small end hydraulic cylinder pull rod. Connected to the small-end hydraulic cylinder, it is characterized in that there is a floating pressure plate on the big-end positioning block, and a small-end pressure ring on the small-end positioning block. The ring is connected with the small end hydraulic cylinder pull rod through the small end pressure plate; the big end positioning pin and the small end positioning pin are respectively placed in the large and small end holes to position the connecting rod, and the large end positioning pin and the small end positioning pin are connected through the cylinder rod According to the respective drive cylinders, the large end positioning pin is a short chamfered pin, and the small end positioning pin is a short round pin. 2. A connecting rod fine boring fixture for large and small end holes according to claim 1, characterized in that the devices for positioning and pressing the big end of the connecting rod are all fixed on the top and back of the upper plate of the big end for positioning and pressing. The devices on the small end are fixed on the top and back of the upper plate on the small end, the upper plate on the large end and the upper plate on the small end are connected with the rib plate, the rib plate is connected with the base plate, and the base plate is fixedly connected with the guide rail of the machine tool. 3. A jig for fine boring large and small end holes of connecting rods according to claim 2, characterized in that, the upper plate at the large end is fixedly connected with the rib plate with screws; the upper plate at the small end and the rib plate can be adjusted The distance is fixed by the U-shaped long hole. 4. A jig for fine boring large and small end holes of connecting rods according to claim 1, characterized in that, between the floating pressure plate and the large end pressure plate that presses the large end of the connecting rod, and between the small end floating pressure plate and the small end pressure plate. The rings are all connected by a U-shaped structure.

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