WO2020004681A1

WO2020004681A1 - Method for manufacturing pulley for vehicle compressor

Info

Publication number: WO2020004681A1
Application number: PCT/KR2018/007209
Authority: WO
Inventors: 한준규; 정상근
Original assignee: (주)한국정공
Priority date: 2018-06-26
Filing date: 2018-06-26
Publication date: 2020-01-02

Abstract

The present invention enables a pulley to be obtained by making, using a small amount of material, a tangible shape close to pulley design dimensions, and through a post-processing process, processing the tangible shape quickly and precisely while reducing the amount of processing, and thus enables overall manufacturing costs to be drastically reduced and ease of processing to be provided, and enables a durable pulley having a dense structure and excellent tractive force to be provided. The present invention comprises: a preparation step for carrying out an annealing treatment and a lubricating treatment on a disk-shaped material so that same may be cold-formed; a primary cold-forging step for making the prepared disk-shaped material into a tangible pulley shape through cold-forging; a secondary cold-forging step for making the tangible shape completed through the primary cold-forging step into a shape which is closer to pulley design dimensions through cold-forging; and a post-processing step for making the tangible pulley completed into a shape close to the design dimensions into a fully completed shape through roughing, piercing and finishing processes.

Description

Method for manufacturing pulley for automobile compressor

The present invention relates to a method for manufacturing a pulley for an automobile compressor, and more particularly, to provide a pulley having excellent durability while significantly reducing the manufacturing cost by obtaining a pulley using a minimum of materials without increasing the process through cold forging. It is about the provision of a new way to help.

In general, an air conditioning system for an automobile or air conditioner uses a characteristic of a refrigerant that causes a change of state, an evaporator that induces evaporation of the refrigerant to cool ambient air, and a refrigerant that is converted into a high temperature low pressure state vaporized through the evaporator. Is a compressor for recompressing the liquid to a pressure that is easy to liquefy, a condenser for converting a gaseous state of high temperature and high pressure gas into external liquid by heat exchange with external air through the compressor, and vaporizing the refrigerant passing through the capacitor. It consists of an expansion valve that performs an expansion process to drop the pressure appropriately.

Particularly, a compressor applied to an automobile is applied to an automobile air conditioning system, and receives power from an engine and drives the refrigerant, which is a low-pressure gas, is compressed to a high temperature and a high pressure in an evaporator, and then transferred to a condenser.

The compressor is powered by a pulley connected through the crankshaft and the belt of the engine, the pulley that performs this role is generally made of a metal material to withstand the tension of the belt.

Conventionally, in the document 1, the hot forging step 51 of preparing such a pulley so as to form a raw material; It is proposed to manufacture by mixing forging a cold forging process 52 to complete the pulley 50 by using the material prepared through the hot forging process (51).

In Document 2, the shaft hole 11 and the small diameter part 12 are formed through the step-by-step plastic working of the circular through-hole in the center, and the inner tube body part 20, the outer body part 30, and the belt part 50 are formed. In the method for manufacturing a pulley for cars,

The material 1 having a circular through hole 10 formed in the center is prepared by piercing the SPHC steel plate, and the shaft hole 11 is formed in the center by flipping the edge portion of the material 1 and the edge thickness portion of the through hole 10. And a first forming process for forming the inner tube body portion 20, the outer body portion 30, and the connecting portion 40 at the same time; A second forming process in which a small diameter portion 12 having a smaller diameter is formed at the end of the shaft hole 11 by expanding only a predetermined depth of the shaft hole 11 as is known; Press the outer body portion 30 up and down, but on one side by pressing the center portion of the thickness of the outer body portion 30 to create the recessed portion 31 to open the edge of the outside of the portion and press the edge as a whole to reduce the thickness A third forming process for increasing the outer diameter while being expanded; A fourth forming step of forming a larger recess portion 31 formed in the process so that the outer portion thereof is further expanded, and pressing the opposite side once more to reduce the thickness and to increase the diameter; A fifth forming step of forming one recess 31 in depth to form a recess 31 ′ that is symmetrical to the other side while being formed to be closer to the rectangular cross section; The thickness between the two recesses 31 and 31 ′ is thinner at the edge and thicker at the center, while the length of the exterior body part 30 is further increased to protrude more than the inner tube body 20 to complete the external forming. A sixth forming step of performing; A rolling step of forming a belt groove 51 on the outer surface of the belt part 50 by a rolling step; It is made up of.

In Document 3, a method for manufacturing a compressor pulley comprising a disc-shaped base portion 11 and an inner ring portion 14 and an outer ring portion 16 which are integral with the base portion 11 and protrude in the longitudinal direction of the compressor. To

A heating step S1 of heating the metal material above a predetermined temperature; Hot forging step (S2) for forming the metal material in a high temperature state in the shape of a pulley 10 having an inner ring portion 14, an outer ring portion 16 and the base portion 11; A central piercing step (S3) of forming a through hole (15) in the connection portion (18) connecting the inner surface of the inner ring portion (14); Cooling step (S4) for cooling the heated pulley (10) to room temperature; A roughing step (S5) of cutting the inner and outer surfaces of the cooled pulley 10; A partial cold forging step (S6) of forging the base portion 11 of the pulley 10 at room temperature; Slot piercing step (S7) to form a slot 12 through the base portion 11; And finishing process step (S8) to the V groove (Groove, 17) and the finish machining on the surface of the pulley (10); It is presented that consists of including.

As described above, in the prior art, a metal material is manufactured by a hot forging method or a method using a combination of hot forging and cold forging, which is considerably more than hot forging when a pulley is manufactured by cold forging. This is because costs are incurred.

However, even if the pulley is actually manufactured by hot forging or a mixture of hot forging and cold forging, it is difficult to drastically reduce the manufacturing cost, which is achieved by using a disc shaped material having a weight of 1,750 g. After the appearance is made and obtained by completing the overall shape of the pulley through the processing process, the amount of raw materials increases, thereby causing a price increase.

As there is a large gap between the visible shape of the pulley through hot forging or cold forging and the shape obtained through processing using a large raw material as described above, the amount of material to be removed by processing in the process increases. Therefore, the processing cost is excessively high, and a lot of load is placed on the equipment and tools required for processing, which shortens their lifespan, and thus does not eliminate the cause of the rising processing cost.

And, due to the characteristics of hot forging can provide ease of processing (molding) as compared to cold forging, but the durability of the finished product becomes weak, when the belt is pulled 270kg when operated by connecting the belt in the vehicle mounted state Since f is less than or equal to a normal vehicle, the vehicle can withstand long-term driving sufficiently.

In the case of a general light car or a small car, such durability can be satisfied, but since the traction force of a belt applied to a sports type car or other high-powered various cars seeking high performance requires a maximum of 500 kgf, a pulley made of hot forging is used. When installed, it will not withstand the traction of the belt and will cause damage to the pulleys and compressors as well as to the major parts of the vehicle concerned.

In this way, if the manufacturing method of pulleys applied to general cars and high-performance cars is different, it is necessary to provide two production lines unnecessarily, so that the production cost cannot be prevented in the end, and the initial installation cost is increased and maintenance is required. Since a lot of costs are required, various problems occur such that the external competitiveness is weak due to the increase in overall costs.

In the present invention, a preparation step of performing annealing and lubricating treatment to cold-form the disk-shaped material; A primary cold forging step of making the prepared disk-shaped material into the visible shape of the pulley through cold forging; A secondary cold forging step of making the shape closer to the design dimension of the pulley through cold forging to the visible shape completed through the primary cold forging; By a post-processing step that makes the visible pulley finished to a shape close to the design dimension to a perfect shape through roughing, piercing and finishing;

By using a small amount of material to create a visible shape close to the design dimensions of the pulley, and through the post-processing process to reduce the amount of processing quickly and precisely to obtain a pulley to obtain a pulley by greatly reducing the overall production cost while providing easy processing and organization It is possible to achieve the purpose of providing a durable pulley that is dense and excellent in traction.

The present invention, while manufacturing the pulley for the compressor by cold forging to reduce the amount of material used and the amount of processing to significantly reduce the cost of production to increase the price competitiveness, as well as to reduce the amount of processing to facilitate the processability while occurring in the process It can reduce the wear and damage of the processing tools can greatly reduce the overall production cost.

The present invention provides a durable product that can cope with the belt towing force while minimizing the amount of processing because it reduces the raw materials and makes the form close to the overall appearance of the pulley during the cold forming without increasing the process in the cold forging process. It can provide various effects.

1 is a process block diagram illustrating a manufacturing process of a pulley for an automobile compressor to which the technique of the present invention is applied.

Figure 2 is a process diagram showing a manufacturing process pulley for a vehicle compressor to which the technique of the present invention is applied.

Figure 3 is a block diagram showing a primary cold forging state of the pulley manufacturing process for automobile compressor applied technology of the present invention.

Figure 4 is a block diagram showing a secondary cold forging state of the pulley manufacturing process for automobile compressor applied technology of the present invention.

Figure 5 is a cross-sectional view showing a pulley for an automobile compressor manufactured by the technique of the present invention.

In the manufacture of the automobile compressor pulley 100 to which the technique of the present invention is applied, the preparation step (S100) of preparing a disk-shaped material 101 to be cold formed and the prepared disk-shaped material 101 are cold-formed. Primary cold forging step (S200) to make the visible shape of the pulley through the forging, and secondary cold forging to make the shape closer to the design of the pulley through cold forging to the visible shape completed through the primary cold forging Step S300 and the post processing step (S400) of processing the completed pulley into a visible shape close to the design dimensions to make a complete shape.

In the preparation step (S100), the disk-shaped material 101 is heated to an appropriate temperature (about 1000 ℃) and then slowly cooled to room temperature to perform the operation to remove the internal residual stress of the cured material and crystal grain (I) to refine the annealed process to increase the ductility, and to carry out the lubrication process to apply the lubrication powder so as to eliminate the jamming during the forging process.

In particular, in the present invention, by using the weight of the disk-shaped material 101 of 1,420g can significantly reduce the weight compared to the material having a weight of 1,740g conventionally used for hot forging, the raw material 101 of By reducing the amount of usage, it can greatly contribute to cost reduction.

In the first cold forging step (S200), the out die 102 for holding the overall shape of the pulley 100, the mandrel 104 and the magnet coil for forming the through hole 103 can be inserted The raw material 101 is supplied to the die 107 composed of the insert die 106 for forming the coil groove 105 and pressed by the punch 108.

As described above, when the first cold forging step S200 is performed, a flat base 109 having a predetermined thickness is formed on an upper surface of the material 101 that is in direct contact with the punch 108, and an out die 102 is disposed below the same. And a through hole 110 for forming the through hole 103 by the mandrel 104 and the insert die 106, and a coil groove 111 for forming the coil groove 105. On both sides of the 111, an inner ring 113 for forming the inner ring 112 and an outer ring 115 for forming the out ring 114 are formed.

Of course, the outrim portion 118 of the protruding shape is formed on the base 109 so that the outrim 117 can be formed by the outrim jaw 116 integrally formed on the out die 102.

In the secondary cold forging step (S300), while the base 109 made in the primary cold forging step (S200) is placed in the lower die 120, the coil groove 111 is separated while holding a dummy pulley. The stripper 121 can be positioned.

In the through hole 110, a through hole 103 is formed by the through hole punch 122, and at the same time, an inner rim 124 is formed by an inner rim punch 123 on the outer side of the outer ring 115. In order to protrude the inner portion 125 to be formed.

In the post-processing step (S400), in view of the outer shape of the pulley 100, a lot of raw material such as a belt groove portion that is cut a lot of rough processing, and a piercing to form a slot for fixing the plate forming the magnetic clutch And, the overall shape of the pulley is precisely machined to meet the finish to be finished to obtain a pulley (100).

Pulley 100 for an automobile compressor of the present invention made as described above, because it uses a material that is relatively light in weight in the process of making the visible shape of the pulley through primary cold forging and secondary cold forging. By reducing the amount of material has the advantage that can contribute to cost reduction.

In addition, since it is possible to precisely mold to the visible shape of the pulley while using a small weight of the raw material, the workability can be excellent because there is no inconvenience of excessively cutting the material in the post-processing process.

In particular, since there is not much amount of material in the process of roughing and finishing, there is no abrasion and damage of the tool used for machining, so it is possible to precisely work with excellent machinability while minimizing idle rate due to replacement of the machining tool. There is a characteristic that can greatly reduce the time required for.

In the primary cold forging, the inner ring, the outer ring, the outer rim, and the belt groove are formed without any difference from the design dimensions. In the secondary cold forging, the inner rim is integrally formed to protrude in the process of forming the through hole. The visible pulley shape can maintain the shape close to the design dimension.

In this state, the pulley is completed through roughing, which removes rough parts, piercing for forming a plurality of holes, and finishing, which is a process of precisely machining to precise dimensions.

According to the present invention, post-processing can be performed efficiently, and since the molding is performed using a relatively low weight material, the structure can be made more compact and the durability can be adequately coped with the pulling force of the belt. It will have the advantage.

Claims

A preparation step (S100) of performing annealing and lubrication to cold-form the disc-shaped material 101;

A primary cold forging step (S200) of making the prepared disc-shaped material 101 into a visible shape of a pulley through cold forging;

A secondary cold forging step (S300) of making the shape closer to the design dimension of the pulley through cold forging to the visible shape completed through the primary cold forging;

Method for producing a pulley for an automobile compressor, characterized in that it comprises a post-processing step (S400) to make a visible pulley completed in a shape close to the design dimensions through roughing, piercing and finishing processing.
The method of claim 1;

In the first cold forging step (S200), the out die 102 for holding the overall shape of the pulley 100, the mandrel 104 and the magnet coil for forming the through hole 103 can be inserted Supplying the raw material 101 of the mold 107 composed of the insert die 106 for forming the coil groove 105 and pressing it with the punch 108;

An upper surface of the workpiece 101 which directly abuts the punch 108 forms a flat base 109 having a predetermined thickness;

To form the through hole 110 and the coil groove 105 to form the through hole 103 by the out die 102, the mandrel 104 and the insert die 106 below the base 109. Forming a coil groove 111 for;

On both sides of the coil groove 111 is formed an inner ring 113 for forming the inner ring 112 and an outer ring 115 for forming the out ring 114;

A protruding outrim portion 118 is integrally formed on the upper portion of the base 109 so that the outrim 117 can be formed by the outrim jaw 116 integrally formed on the out die 102. Pulley manufacturing method for an automobile compressor.
The method of claim 1;

In the second cold forging step (S300), while holding the base 109 in the lower die 120, the coil groove portion 111 is located stripper 121 which can be detached while holding the dummy pulley;

Through holes 103 are formed in the through holes 110 by the through holes punch 122;

At the same time as the formation of the light through hole 103, the upper outer side of the outer ring 115 is formed by protruding the inner rim portion 125 for forming the inner rim 124 by the inner rim punch 123 Method for manufacturing pulley for compressor.