KR20090105385A - Method of making sintered object - Google Patents

Abstract

PURPOSE: A sinter forming method using the processing of a molded member is provided to improve quality and increase productivity by making an excellent processing surface and increasing processing time. CONSTITUTION: A sinter forming method using the processing of a molded member comprises a mixing process(110), a molding process(130), a first process(140), a sintering process(150), a fixed form process(160), and a second process(170). In the mixing process, solid lubricant is added to and is mixed with sintered powder. In the molding process, a molded member is formed in a desired shape by powder finished after mixing. In the first process, a processing is carried out to form the molded member to be near to end-product. In the sintering process, the property is applied by heating the molded member firstly processed. In the fixed shape process, the deformation generated in the sintered process is fixed and the molded member is pressurized again to improve the whole precision. In the second process, the molded member is final-processed to have exact dimension.

Description

Sintering molding method using molding process {METHOD OF MAKING SINTERED OBJECT}

The present invention relates to a sintering molding method using a molded object processing, and more particularly, to a sintering molding method for improving processability and quality by improving a method of molding a sintered product.

Since sintering molding is performed using metal powder, the process is simpler than traditional casting or roll cloth, and the precision is improved while the weight is light and the cost is reduced.

As shown in Figures 3 and 4, the sintering molding as described above, the blending process (1) to add and mix the solid lubricating oil so as to provide the ease of forming and the ease of forming on the metal powder, and the mixed powder And a sintering process (3) for applying physical properties to form chemical bonds by atomic diffusion movement between powder particles formed in the molding process (2), and sintering Machining process (5) and processing to correct the deformation that may occur in process (3) to re-pressurize to improve the overall precision and to have the correct dimensions of the product that has undergone the shaping process (4) After that, it is completed by other post process (6) for quality improvement.

In the prior art as described above, in order to complete one product 7 through sintering molding, the molded body 8 is completed with metal powder, and then subjected to the sintering process (3). Machinability is not good because must be performed.

In recent years, when sintering of high density and high strength products requiring long life and durability of parts and products, in addition to carbon, iron, and copper powders used for general sintering, nickel and molybdenum powders are added to sinter molding to achieve high density and high strength. The molded product is completed.

In general, sintered molded articles with high density (6.6 to 6.9 g / cm 3) can be processed regardless of the processing amount by using general carbide processing tools, but high density high strength (7.0 to 7.7 g / cm 3) In the case of molded products, since the machinability is not good, the machining time of the general cemented carbide tool is long, and the machining surface is not good even when processed.

In the case of processing with a general processing tool, even if an expensive processing tool made of CBN (Cubic Boron Nitride) material cannot be processed at a sufficient speed, it causes a huge increase in processing cost.

In addition, high-density, high-strength sintered products are frequently damaged during molding through multi-stage molds, such as molding products that are not dense. Since the amount is increased, the life of the processing tool is shortened, and the processing time is long, so that the problem of the increase in the processing cost and the decrease in productivity is not avoided.

In the present invention, in order to solve the above problems in the sintering molding products having a high density high strength (7.0 ~ 7.7g / ㎠);

Blending process for adding and mixing solid lubricating oil to provide ease of forming and releasing to sintered powder, forming process for forming the molded product into the desired shape of the mixed powder, and processing the molded product to be close to the final product A primary processing step to perform the step, a sintering step of applying physical properties to the primary molded body, and a shaping step of repressurizing to improve overall accuracy by correcting deformation that may occur in the sintering step; It aims to improve the productivity and maintain the high quality while providing the ease of processing by completing the secondary processing process to finish processing to have the exact dimensions of the product after the shaping process.

The present invention is to prevent the damage to the processing tool by performing the final processing after performing the primary processing in the state of forming the mixed powder to the desired shape when obtaining a high-density high-strength product through sintering molding It is an invention with many expected effects, such as securing an external competitiveness by making the machining surface excellent and increasing productivity with excellent quality by greatly increasing the processing time.

Hereinafter, with reference to the accompanying drawings look at a preferred manufacturing example of the present invention for achieving the above object.

1 is a process block diagram showing a sintering molding method using a molded body processing to which the technique of the present invention is applied. FIG. 2 is a schematic diagram showing a sintering molding process using a molded body processing according to the technique of the present invention.

The sintering molding of the product 100 having high density and high strength (7.0 to 7.7 g / cm 3) to which the technique of the present invention is applied can provide the ease of forming and the ease of mold release to carbon, iron, copper, nickel and molybdenum powder. A blending process 110 for adding and mixing solid lubricating oil so as to be able to mix;

A molding step 130 of forming the molded body 120 into a desired shape of the mixed powder through the compounding step 110;

A primary processing step 140 for processing the molded body 120 formed through the molding process 130 to approach the final product;

A sintering process 150 for applying physical properties to the primary processed molded body 120 to form chemical bonds by atomic diffusion movement between powder particles;

A shaping process (160) for repressurizing to correct the deformation that may occur in the sintering process (150) to improve the overall precision;

Finishing process is completed in the secondary processing process 170 to have a precise dimension of the product passed through the shaping process (160).

In the primary processing process 140, the molded body 120 is chucked at a chucking pressure within a range that is not damaged to a processing means such as a CNC lathe, and the final processing amount is left using only a processing tool such as a conventional bite. To do this.

The final amount of processing is sufficient to be enough to be carried out for the dimensional management in the secondary processing process (170).

The present invention as described above,

The sintered powder blended through the blending process 110 is formed into a shape close to the final product 100 through the molding process 130, and the molded body 120 formed through the molding process 130 is primarily formed. The machining is performed close to the final product 100 through the machining process 140.

In this case, the surface of the molded body 120 is processed using a processing tool in a state of being chucked to the processing means so that the molded body 120 is not damaged, and is processed in a state close to the final product 100.

That is, after the sintering process 150 and the shaping process 160, the secondary processing process 170 through the secondary processing step 170 to perform the processing to the surface processing or finish processing for accurate dimension management of the product 100 do.

As such, the molded body 120 in which the primary processing process 140 is completed is completely formed through the sintering process 150 and the shaping process 160, and is dimensioned through the secondary processing process 170 in the completed molding state. The product 100 is completed through management or surface processing.

As described above, in the case of forming the product 100 through the sintering molding method using the molded body processing, almost all of the processing amount of the molded body 120 is processed in the primary processing step 140, and after sintering, the secondary processing step 170 ), The processing amount can be made more easily because the processing amount is very small.

Therefore, in the secondary processing process 170, since the amount of processing is small without using expensive processing tools, it is possible to easily process and improve the surface, as well as increase the processing speed to increase the overall production amount. will be.

1 is a process block diagram showing a sintering molding method using a molded body processing to which the technique of the present invention is applied.

Figure 2 is a diagram showing a sintering molding process using the molding process by the technique of the present invention.

3 is a process block diagram showing a sinter molding method to which the prior art is applied.

Figure 4 is a diagram showing a sintering molding process to which the prior art is applied.

* Description of the symbols used in the main parts of the drawings *

100; product

110; Compounding process

140; Primary processing process

150; Sintering Process

170; Secondary processing process

Claims (1)

In sinter forming a product 100 having a high density high strength (7.0 to 7.7 g / cm 3); A blending process (110) for adding and mixing solid lubricating oil to provide sintered powder with ease of forming and ease of demolding; A molding step 130 of forming the molded body 120 into the desired shape of the mixed powder; A primary processing step 140 for processing the molded body 120 to approach the final product; A sintering process 150 for providing physical properties by applying heat to the primary molded body 120; A shaping process (160) for correcting the deformation that may occur during the sintering process to re-pressurize to improve the overall precision; Sintering molding method using a molded object processing, characterized in that the finishing process to complete the secondary processing step 170 to finish processing to have the exact dimensions of the product (160).

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