Manufacturing method of piston pin and piston pin, manufactured by this method

FIELD: metallurgy.

SUBSTANCE: invention relates to metal deformation process and can be used for manufacturing of piston pins, allowing taper section of inner surface on each end. For this metal rod is split for rod cylinders. It is implemented punching by extrusion of mentioned detail with formation in it of the first and the second hollows. By means of punching it is received hollow cylinder. Then at each end of this detail it is formed taper section of inner surface by extruding.

EFFECT: consequently it is provided increasing of part-making productivity and reduction in value of received products.

18 cl, 4 dwg

 

Prerequisites to the creation of inventions

The present invention in General relates to the creation of a method of manufacturing (molding) piston pins, and more specifically to the creation of a method of manufacturing piston pins having tapered bores in one or multiple transactions. The present invention also relates to a conical porshneva finger made by this method.

Reciprocating movement of internal combustion engines typically have pistons that move in the cylinders. As shown in figure 1, the piston 12 is a sliding plug that fits tightly into the groove of the cylinder. The piston is essentially doing alternating movement in the cylinder. The ignition of the mixture of fuel and air above the piston creates a gas pressure due to the compressed and ignited gases. This pressure pushes the piston downwards. When this happens, the piston transmits the force of the expanding gaseous products of combustion through the piston pin 10 to the rod 14. The piston attached to the rod and, consequently, to the crankshaft, which converts the reciprocating motion of the piston into rotational motion.

Piston pins are an important part of the system of the internal combustion engine. Each piston pin passes through aligned holes in Orne and the rod and provides a swivel (swivel) connection between the rod and the piston. When the crankshaft rotates, one end of each connecting rod moves in an orbit around the axis of the crankshaft. The other end of the connecting rod performs a rotary movement around your finger inside the piston, whereby each piston transmits power through the connecting rod to the crankshaft. Each piston pin provides a hinged connection between the rod and the piston.

Efforts to piston porshneva finger and the rod due to the combustion, are huge. In addition, blocks, pistons (pistons, piston pins and connecting rods) are responsible for a large part of the friction losses in the engine performance. In the design of engines has been a tendency to reduce reciprocating movement of the block mass of the piston, including the crankshaft. Quality characteristics can be improved through the use of a lighter piston pin, which reduces inertial losses, resulting in increased engine efficiency. Thus, low weight is a key feature of effective piston pin and piston. In addition, the ideal piston pin has other important characteristics: wear resistance, rigidity and high durability that can withstand the extreme forces occurring in the combustion process. One of the ways to reduce the weight of the piston, palc what is the weight on the ends of the inner diameters of the finger through the creation of open outward conical inner section.

Some piston pins is formed with a Central crosspiece near the middle of the finger, as shown in figure 3. These piston pins with the Central bridge is also called fingers with bilateral extrusion or with double-sided molding. Other piston pins, which allow to further reduce the weight due to the formation of the jumpers on one end of the finger shown in figure 4. It should be borne in mind that the jumper can be eliminated to further reduce the mass of the finger. These pins are called respectively fingers with end plugs, fingers without the jumper, the fingers of the one-way extrusion or with single-sided molding. The other piston pins may be tapered holes for weight reduction. Currently using machining (machine) to create the inner cone in the finger or use the forcing cone in the inner area of the finger with the Central crosspiece. In addition, some of the cones can be obtained on the domestic portion of the finger with single-sided molding, secondary operations, machining or molding. These additional operations may include any combination of operations annealing, lubrication and secondary forming operations. However, none of the proposed methods is not what I cost-effective and allows you to optimize the weight loss of a finger. All of these methods are very expensive.

As mentioned above, all known methods have various disadvantages, including low productivity and high cost, which does not allow to optimize the weight loss of a finger. There is a need to create a cost-effective manufacturing method for the formation of a conical piston pins with a Central crosspiece or without the jumper in one sequence of the molding press. In addition, there is a need for an improved and more economical method of forming the inner cones in the piston finger.

Summary of invention

As mentioned above, in modern systems of internal combustion engine there is a need to create cost-effective way of manufacturing conical piston pins with a Central crosspiece or without the jumper, having light weight and high strength. In accordance with the present invention offers an efficient and cost-effective method of cold forming a conical piston pins with a Central crosspiece or without the jumper. The present invention eliminates secondary operations conducted individually or in combination with primary operations, such as by machining, coating and the secondary molding. According the another aspect of the present invention, it is proposed to produce cones of the piston pin with large angles and lengths that allow to further reduce the weight compared to previously known processes.

Brief description of drawings

Figure 1 shows the front view of the piston system with piston pin, hinge mounted between the rod and the piston.

On figa shown wider adjacent the angle in the first operation of forming cone, and punch the next station is shown at the point of contact.

On FIGU shown narrower adjacent the corner in the operation of the forming cone, and punch the next station is shown at the point of contact.

Figure 3 shows an exemplary method of manufacturing a conical piston pins with a Central crosspiece, with bilateral squeezing.

Figure 4 shows an exemplary method of manufacturing a conical piston pins without the jumper with one bump.

Detailed description of the invention

On figa-D and 4A-D shows a typical process of manufacturing piston pins. These processes begin with the use of a steel bar or a roll of steel wire. Usually use wire of carbon steel, as the physical and mechanical properties of carbon steel are attractive for education piston pins, and also because it allows cost-effective about the time to provide the required characteristics of the final product. However, there may be used and other metals depending on the specific application. The metal wire unwind and straighten. After exiting the unwinding device the metal wire is cut into individual pieces. These pieces are mostly cylindrical. After that, the pieces are preparing for carrying out processes of extrusion forming by extrusion). Depending on the requirements of the consumer may require the creation of cones piston pins. The way to create cones will be described hereinafter with reference to the following figures.

Figure 3 shows a typical sequence of extrusion (using stamping extrusion) bilateral forming the piston pin with a Central crosspiece. Experts familiar with cold stamping, will easily understand that it shows only one possible example of the formation of the piston pin, and it should be borne in mind that the present invention is applicable to all methods of forming the tapered holes in the pipe stamped blanks.

Figure 4 shows the sequence extrusion unilateral molding of the piston pin end with a jumper. Experts familiar with cold stamping, will easily understand that it shows only one possible example of the formation of the piston pin, and should the future in mind that the present invention is applicable to all methods of forming the tapered holes in the pipe stamped blanks.

Let us now turn to the consideration figa, which shows how to use a tubular preform 50 in accordance with the present invention the operation is carried out education cones on both ends of the inner section of the blank of the piston pin. First, form a cone with a large adjacent angle 58 than the desired angle 52, at a predetermined length, which in the axial direction of the piston pin may be shorter than the length of the finished cone or equal to it. The final contour of the finished cone shown by the position 56. It should be borne in mind that this is only an example, and experts familiar with the technology of forming, will easily understand that the method can be used one or many stations, however, the present invention focuses on the most cost-effective method of forming cones in the inner area of the tubular billet piston pin. However, beyond the scope of the present invention does not resume the use of multiple sequences (actions), the formation of the cones in the inner area of the tubular billet.

On FIGU shows an example of forming the finished piston pin of the tubular workpiece 68, obtained after the previous operation of the forming cone. N is figv shown finishing tool 62, located above the workpiece with a pre-formed conical wall 168. The final contour of the finished cone is shown by position 66. Experts familiar with the technology of forming, will easily understand that the method can be used one or many stations, however, the present invention focuses on the most cost-effective method of forming cones in the inner area of the tubular billet.

The above-described method of forming cones in the inner area of the piston of the fingers is only one of the possible examples of implementations, namely one of the possible approaches to the formation of cones in reciprocating fingers, which eliminates the need for expensive mechanical machining, coating or additional forming processes. However, it should be borne in mind that the actual implementation may differ from those described above. Moreover, various other improvements and modifications of the present invention.

Despite what has been described the preferred embodiment of the invention, it is clear that it specialists in this field can be amended and supplemented, which do not extend, however, beyond the scope of the following claims.

1. A method of manufacturing a piston pin, including the formation of the hollow cylindrical the second part, having at each end a conical portion inner surface, characterized in that the said hollow cylindrical part with a tapered section of the inner surface at each end formed by stamping, pressing each end of the workpiece in the form of a hollow cylindrical part.

2. The method according to claim 1, characterized in that during the forming of the extruded carry out the introduction of the first punch or the first punches, respectively, at one or both ends of the workpiece in the form of a hollow cylindrical part with the formation at one or both ends of the last of the first tapered section of the inner surface located at a selected acute angle to the inner surface of the workpiece in the form of a hollow cylindrical part, and an introduction to one or both ends of the workpiece in the form of hollow cylindrical parts, respectively, of the next punch or following punches with the formation at one or both ends of the last of the second tapered section of the inner surface located below the second predetermined acute angle to the inner surface of the hollow cylindrical part.

3. The method according to claim 2, characterized in that the second specified acute angle of the second tapered section of the inner surface is smaller than the first preset acute angle of the first tapered section of the inner surface.

4. The method according to claim 2, from which causesa fact, the second preset acute angle of the second tapered section of the inner surface is greater than the first preset acute angle of the first tapered section of the inner surface.

5. A method of manufacturing a piston pin, characterized in that it includes cutting a metal rod, mainly cylindrical rod parts, stamping the extruded cylindrical rod parts with education in her first cavity, stamping the extruded cylindrical rod parts with education in her second cavity, the penetrating cylindrical rod parts with the formation of the hollow cylindrical part, forming at each end of the hollow cylindrical part conical section of the inner surface by stamping, pressing each end of the said hollow cylindrical part.

6. The method according to claim 5, characterized in that during the forming of the extruded hollow cylindrical part carry out the introduction of the first punch punch at the end of a hollow cylindrical part with the formation of the first-mentioned punch of the first tapered section of the inner surface located below the first predetermined acute angle to the inner surface of the hollow cylindrical part, and an introduction to the end of the hollow cylindrical part with an educated first conical section of the second punch stamp with about what adowanie second conical section of the inner surface, located below the second predetermined acute angle to the inner surface of the hollow cylindrical part.

7. The method according to claim 6, characterized in that the second specified acute angle of the second tapered section of the inner surface is smaller than the first preset acute angle of the first tapered section of the inner surface.

8. The method according to claim 6, characterized in that the second specified acute angle of the second tapered section of the inner surface is greater than the first preset acute angle of the first tapered section of the inner surface.

9. A method of manufacturing a piston pin, characterized in that it includes the punching rod parts with the formation of the hollow cylindrical part, the formation of her hollow cylindrical part with a conical section of the inner surface at each end by forming a bump on each end of the said hollow cylindrical part.

10. The method according to claim 9, characterized in that when forming the bump at the end of the hollow cylindrical part enter the first punch stamp with the formation of the first tapered section of the inner surface located below the first predetermined acute angle to the inner surface of the hollow cylindrical part.

11. The method according to claim 10, characterized in that when forming the bump at the end of the hollow cylindrical part is introduced into the second punch stamp with the formation of the second tapered section of the inner surface, located below the second predetermined acute angle to the inner surface of the hollow cylindrical part.

12. The method according to claim 11, characterized in that the second specified acute angle of the second tapered section of the inner surface is smaller than the first preset acute angle of the first tapered section of the inner surface.

13. The method according to claim 11, characterized in that the second specified acute angle of the second tapered section of the inner surface is greater than the first preset acute angle of the first tapered section of the inner surface.

14. Piston pin made with a tapered section of the inner surface at each end, characterized in that it is made of sharp metal rod, generally cylindrical rod parts, stamping the extruded cylindrical rod parts with education in her first cavity, forming the extruded cylindrical rod parts with education in her second cavity, the cylindrical punch rod parts with the formation of the hollow cylindrical part, forming at each end of the hollow cylindrical part conical section of the inner surface by stamping, pressing each end of the said hollow cylindrical part.

15. The finger 14, characterized in that it is manufactured by a process in which when the stamp is VCE extruded hollow cylindrical part carry out the introduction of the first punch punch at the end of a hollow cylindrical part with the formation of the first-mentioned punch of the first tapered section of the inner surface, located below the first predetermined acute angle to the inner surface of the hollow cylindrical part.

16. The finger 15, characterized in that it is manufactured by a process in which when forming the bump at the end of a hollow cylindrical part with an educated first conical section enter the second punch stamp with the formation of the second tapered section of the inner surface located below the second predetermined acute angle to the inner surface of the hollow cylindrical part.

17. Finger in clause 16, wherein the second preset acute angle of the second tapered section of the inner surface is smaller than the first preset acute angle of the first tapered section of the inner surface.

18. Finger in clause 16, wherein the second preset acute angle of the second tapered section of the inner surface is greater than the first preset acute angle of the first tapered section of the inner surface.



 

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