KR100456551B1 - Jig and method for splitting of hotforging splitsteel connectingrod - Google Patents

Abstract

The present invention relates to a splitting process jig and a breaking splitting method of a forged split steel connecting rod, and to set up a suitable jig for fixing and breaking the connecting rod for easy breaking of the rod and cap-integrated connecting rod. It is essential to establish the splitting conditions. In the manufacture of connecting rods by breaking the rods and caps, it is necessary to provide optimum parameters for the breaking splitting process jig and breaking, so that the rods and caps can be loaded, compared to the conventional machining of the rods and caps. As the cap seat and width machining can be omitted, the splitting process of forging split steel connecting rod can reduce the cost and contribute to increase the rigidity of the connecting rod by improving the adhesion of the seat, and improve the performance by improving the adhesion. It relates to a jig and a splitting method.

Description

Jig and method for splitting of hotforging splitsteel connectingrod}

The present invention relates to a splitting process jig and a breaking splitting method of a forged split steel connecting rod, and more particularly, to set up a suitable jig for fixing and breaking the connecting rod for easy breaking of the rod and cap integrated connecting rod. Of course, it is essential to establish the optimum splitting conditions. In the manufacture of the connecting rod by breaking the rod and the cap, it is necessary to provide the optimum parameters necessary for the breaking splitting jig and the breaking, thereby making it possible to process the seat of the existing rod and the cap. As a result, the rod and cab seat and width machining can be omitted, which contributes not only to cost reduction, but also to the rigidity of the connecting rod due to improved seat adhesion, and to improved performance through improved adhesion. The present invention relates to a rod splitting process jig and a breaking splitting method.

In general, the connecting rod for automobile engine is connected to the piston to reciprocate in the cylinder, and the main drive of the engine system that functions to convert the reciprocating motion of the piston into the rotational motion of the crankshaft by receiving gas pressure of high temperature and high pressure in the expansion stroke. Parts.

As shown in FIG. 4, the connecting rod 10 is largely divided into three parts. One end of the connecting rod 10 is connected to a small end 11 connected to a piston via a piston pin, and the other end is connected to a crank shaft. It consists of a large end 12 and a column 13.

The large end portion 12 is provided with a cap 15 having a semi-circular shape, the cap is formed on both ends of the fastening hole 16 is in communication with the rod 14, the bolt ( 17) and nuts 18 are fixed.

The manufacturing method of the connecting rod 10 made in this way is a material manufacturing process for forming the kinecting rod 10 from a carbon steel material, and a machining process for mechanically machining the connecting rod 10 formed by the material manufacturing process. Is done.

Connecting rod 10 manufactured by the manufacturing method as described above is separated into two in terms of the separation process of the rod 14 and the cap 15, as shown in Figure 4, after forging, the rod 14 And the rod 14 and cap 15 seat surface machining type for machining the joint surface of the cap 15 to fasten the bolt 17, and the notches of the integral forging and the large end 12, as shown in FIG. (19) After shaping | molding, the rod and cap breaking division which drive the wedge 21 and break | segmentation are separated | separated.

At this time, the break split type has advantages such as cost reduction due to the reduction in the number of machining operations compared to the left side cut type, and the formation of the notch 19 for effective break split is essential.

The formation of the notch 19 is formed by broaching process, the formation process of the notch 19 is very important, because the connecting rod 10 according to the shape of the notch 19 and the notch 19 is applied. This is because it is determined whether it can be easily partitioned.

By the way, the conventional break-dividing method performs a milling, i.e., seating, of the joints of the rod 14 and the cap 15, and thus requires a lot of processing time and relatively inferior adhesion of the rod 14 and the cap 15. There is a problem in that the durability of the connecting rod 10 due to the decrease in adhesion degree and the durability strength such as premature failure of the bolt 17 is caused.

Accordingly, the present invention has been made to solve the above problems, to set up the appropriate jig for fixing and breaking the connecting rod for easy breaking of the rod and cap-integrated connecting rod, as well as to determine the optimum splitting conditions. It is essential to establish, in the manufacture of connecting rods by breaking of the rod and cap, by providing the optimum parameters for the breaking process jig and breaking, the conventional rods and caps can be machined, rod and cap seats And the cutting process can be omitted, which contributes not only to cost reduction but also to the increase of rigidity of the connecting rod due to improved seat adhesion, and to the improvement of performance by improved adhesion. The purpose is to provide a partitioning method.

1 is a schematic diagram showing a split process jig of a connecting rod using a columnar mandrel according to the present invention

2 is a view showing a variable having a splitting condition in the breaking splitting process of the connecting rod according to the present invention;

3 is a view showing a step (S) according to the fracture shape according to the present invention.

Figure 4 is a perspective view of a conventional conventional rod and cap seat machining connecting rod

Figure 5 is a plan view showing a conventional conventional rod and cap breaking split connecting rod

6 is a plan view showing the divided rod and the cap;

<Explanation of symbols for the main parts of the drawings>

10: connecting rod 11: small end

12: big end 13: column

14: Load 15: Cap

16: fastening hole 17: bolt

18: Nut 19: Notch

20: fixed jig 21: wedge

22: mandrel 22a: hollow part

23: half shell

Hereinafter, the features of the present invention for achieving the above object are as follows.

Dividing process jig of the forging divided steel connecting rod according to the present invention is embedded in the inner diameter of the large end portion 12 of the connecting rod 10 and has the same inclined surface as the inclined surface of the wedge 21 to be coupled to the wedge 21 therein. A mandrel 22 made up of a plurality of segments including a hollow portion 22a having a portion, and a pressing force in the circumferential direction on each of the divided portions of the mandrel 22, provided in the hollow portion 22a of the mandrel 22. In the dividing process jig of the forging split steel connecting rod consisting of a wedge 21 having an inclined surface for applying a wedge, the inclined surface of the wedge 21 has an inclination angle of 5 to 9 ° on the rod side and zero on the cap side. The outer diameter and the small end of the mandrel 22 eccentric toward the rear end of the small end 11 of the connecting rod 10 are 0.1 mm in diameter between the large end 12 of the barrel 22 and the connecting rod 10. The gap between the inner diameter of 11) is characterized in that the front side and the rear side are formed of 2mm and 0.2mm, respectively .

Breaking splitting method of the connecting rod according to the present invention is embedded in the inner diameter of the large end portion 12 of the connecting rod 10 and the hollow portion having the same inclined surface as the inclined surface of the wedge 21 to be coupled to the wedge 21 therein A mandrel 22 made up of a plurality of segments including 22a and a hollow portion 22a of the mandrel 22 for applying a circumferential pressing force to each segment of the mandrel 22. In the splitting method of breaking the connecting rod using the fixing jig 20 composed of the wedge 21 having the inclined surface, the optimum variable in the breaking splitting of the connecting rod 10 is that the pressing force F1 of the wedge 21 is 10 ton, The breaking load F2 is 2.2 tons and the inclined surface of the wedge 21 has an inclination angle of 5 to 9 ° on the rod side and zero on the cap side, and the diameter of the large end portion 12 of the mandrel 22 and the connecting rod 10. The difference is characterized in that 0.1mm.

In addition, the optimum variable is characterized in that it further comprises a chip removal process consisting of a step of vibrating the cap 15 to the rod 14 side and at the same time sucking the air.

Hereinafter, the configuration of the present invention with reference to the accompanying drawings in detail.

1 is a schematic diagram showing a process for splitting the breaking of the connecting rod using the columnar mandrel according to the present invention, Figure 2 is a view showing a variable having a split condition in the process of splitting the breaking of the connecting rod according to the present invention, 3 is a view showing a step (S) according to the fracture mode according to the present invention.

In the connecting rod, the rod 14 and the cap 15 are integrally forged, and the notches 19 are formed at a large end 12 with a constant width and depth, and then as shown in FIG. After the rod 10 is fixed to the fixing jig 20, the wedge 21 is inserted and pressed by the pressing device, so that the wedge 21 enters the inside of the large end 12 while the cap 15 is pressed. It is split from this connecting rod 10 and divided.

Thereafter, as described above, a fracture surface generated by splitting by the entry of the wedge 21 at the joint surface of the rod 14 and the cap 15 of the divided connecting rod 10 is formed. It is a process of bolting the rod 14 and the cap 15 by rejoining it as it is, without processing.

The present invention seeks to provide an optimum variable which is an easy condition of the breaking dividing process jig and the breaking dividing in the above-described breaking division process.

First, an embodiment for obtaining the optimal variable as described above is a mandrel, which is mounted on the inner diameter of the large end portion 12 and has a hollow portion 22a therein, as shown in FIG. 1. And a fixing jig installed in the hollow part 22a of the mandrel 22 and including a pressurizing device for applying a pressing force to the angular splitting body outwardly, the mandrel 22 ) Diameter of 42 ~ 45mm, the diameter of the half shell (half shell) (23) is 49mm, the height of the mandrel 22 and the half shell (23) is made of 35 ~ 40mm, the mandrel 22 and The diameter difference of the large end part 12 of the connecting rod 10 is 0.1 mm, and is between the outer diameter of the mandrel 22 and the inner diameter of the small end part 11 which are eccentrically toward the rear end of the small end part 11 of the connecting rod 10. The gap is formed of 2 mm and 0.2 mm in the front side and the rear side, respectively, so that when the rod 14 and the cap 15 are broken, the rod 14 may proceed toward the small end portion 11. It is.

The connecting rod 10 fixed by the fixing jig 20 for splitting such a break is easily broken according to the optimum variable as described above. Table 1 shows the breaking splitting process of the connecting rod 10. When pressing the wedge 21 into the hollow portion 22a of the mandrel 22, the pressing force of the wedge 21, the breaking load, the angle of the wedge 21, the mandrel Optimal setting of the difference between the diameters of the 22 and the connecting rod 10 and the like, and the optimum variable of the superior level compared to the comparative example.

Here, F1 represents the pressing force of the wedge 21 by the pressing device, F2 is the breaking load, DEG represents the inclination angle of the wedge 21, Djig is the mandrel 22 and the connecting rod 10 end The diameter difference of the part 12 is shown.

In the splitting of the connecting rod 10, the optimum variable is 10 tons of pressing force of the wedge 21, 2.2 ton of breaking load, 5 to 9 ° of the inclination angle of the wedge 21 to the rod 14, compared to the comparative example. The diameter difference between the mandrel 22 and the connecting rod 10 large end portion 12 is set to 0.1 mm.

In addition, a chip removing step (10 bar) is formed, which comprises a step of vibrating the cap 15 to the rod 14 side and sucking air at the same time.

At this time, when the pressing force of the wedge 21 is less than or above 10 tons, there is a problem that the step of the fracture surface is severe, when the breaking load is less than or equal to 2.2 tons, there is a fear that stretching, such as plastic deformation may occur, If the inclination angle of 21 is less than 5 ° toward the rod 14, the depth and width of the notch 19 are difficult to be formed, and there is a risk of plastic deformation due to an increase in the breaking load of the overbreak surface of 9 °.

In addition, when the diameter difference between the mandrel 22 and the connecting rod 10 of the large end portion 12 is less than or equal to 0.1 mm, problems such as time difference and fracture surface mismatch occur at break.

In the fracture chip removal step, if the chip on the fracture surface is not removed, the surface state around the fracture surface is uneven and unclean, resulting in poor assembly.

On the other hand, the break split parallax obtained through such an optimum variable, the step of the fracture shape (S), the roundness at the time of reassembly after break is excellent results compared to the comparative example, the break split parallax is 20ms, the break shape The step of D will be less than ± 1mm.

When the splitting time difference, which is the main variable, is not in the range of 20 ms, and the larger the divided load difference is, there is a possibility that the breakage step becomes disadvantageous, and when the breakage step S of the break type is greater than ± 1 mm based on the center line, Since there is a high risk of step generation and plastic deformation, the rod 14 and the cap 15 are inconsistent.

Roundness is 0.050 ~ 0.080mm can achieve an excellent roundness improvement.

As described above, in the present invention, in forming the notch of the connecting rod, the shattering process jig and the optimum conditions thereof are formed so that the strength and rigidity of the connecting rod can be improved by 10% and 20%, respectively. In addition, compared with the existing molding method, the reduction rate of deformation is reduced to 1/4 so that the roundness is remarkably improved, and the cost reduction can be expected by 25% reduction compared to the current mass production specifications.

Claims (4)

delete It is embedded in the inner diameter of the large end portion 12 of the connecting rod 10 and consists of a plurality of partitions including a hollow portion 22a having the same inclined surface as the inclined surface of the wedge 21 to be coupled to the wedge 21 therein. Forged division consisting of a mandrel 22 and a wedge 21 provided on the hollow portion 22a of the mandrel 22 and having an inclined surface for applying a circumferential pressing force to each divided body of the mandrel 22. In the splitting process jig of the steel connecting rod, The inclined surface of the wedge 21 has an inclination angle of 5 to 9 ° on the rod side and zero on the cap side, and a diameter difference between the mandrel 22 and the large end portion 12 of the connecting rod 10 is 0.1 mm. The gap between the outer diameter of the mandrel 22 and the inner diameter of the small end 11 eccentrically toward the rear end of the small end 11 of the rod 10 is forged, characterized in that the front side and the rear side are formed with 2 mm and 0.2 mm, respectively. Split process jig for split steel connecting rod. It is embedded in the inner diameter of the large end portion 12 of the connecting rod 10 and consists of a plurality of partitions including a hollow portion 22a having the same inclined surface as the inclined surface of the wedge 21 to be coupled to the wedge 21 therein. Fixing jig composed of the mandrel 22 and the wedge 21 which is provided in the hollow part 22a of the said mandrel 22, and has the inclined surface for applying the circumferential pressing force to each division of the mandrel 22. In the breaking division method of the connecting rod using (20), The optimum variable for breaking splitting of the connecting rod 10 is 10 tons of pressing force F1 of the wedge 21, 2.2 tons of breaking load F2, and 5 to 9 degrees of inclination of the wedge 21 to the rod side. And the cap side is zero, and the difference in diameter between the mandrel 22 and the large end portion 12 of the connecting rod 10 is 0.1 mm. The method of claim 3, wherein the optimum variable further comprises a chip removal process consisting of a step of vibrating the cap 15 to the rod 14 side and at the same time sucking the air. Breaking method of forging split steel connecting rod