JP2012035331A - Method for manufacturing power train product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a power train product, which does not cause a problem of residual foreign matters or the like even if a rust proofing treatment is performed on an in-line basis.SOLUTION: The method for manufacturing a power train product includes the steps in the order of: a forging step of forging a rod-like material 10 to make a raw base 20; a normalizing and tempering step of subjecting the raw base 20 to normalizing and tempering treatments; an external form cutting step of cutting an external form of the raw base 20 after the normalizing and tempering treatments to obtain an external form processing base 30; a surface treatment step of applying a surface treatment to the external form processing base 30 whose external shape has been cut; an internal form cutting step of cutting an internal form of the external form processing base 30, to which a surface treatment has been applied, to obtain a product base 40; and a part assembling step of mounting functional parts to the product base 40 whose internal form has been cut.

Description

  The present invention relates to a method for manufacturing power train products such as injectors and common rails.

  As described in Patent Document 1, power train products such as common rails are subjected to cutting on an unprocessed base subjected to normalizing and tempering to form internal and external communication holes and screws, and then after cutting The product is manufactured by subjecting it to surface treatment such as rust prevention and then assembling functional parts.

  Here, examples of the surface treatment include black dyeing and plating. These processes are wet processes, and usually batch processes are performed. Therefore, for example, it is usually performed in a different place from the powertrain product production line, such as another factory or another company. Therefore, there has been a problem that the process of manufacturing the powertrain product is divided and the cost is increased.

  As seen in Patent Document 2, as a plating treatment method different from wet plating, an element in the composition of the coated metal powder is injected and collided with the surface of the product to be treated. There is known a method (hereinafter referred to as a PIP method) in which activated carbon is activated and adsorbed on the surface of a product to be treated and diffused and penetrated.

JP 2008-151099 A Japanese Patent No. 3365887

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems related to a method for manufacturing a powertrain product, and an object of the present invention is to provide a method for manufacturing a powertrain product that does not cause problems such as residual foreign matter even when rust prevention treatment is performed in-line. .

  In order to solve the above-mentioned problems, the invention of claim 1 includes a forging process in which a bar-shaped material 10 is forged into a raw base 20, and a normalizing and tempering process in which the raw base 20 is normalized and tempered. And an external cutting step for cutting the external shape of the unprocessed base 20 subjected to normalization and tempering to obtain an external processing base 30, and a surface treatment step for applying a surface treatment to the external processing base 30 after cutting the external shape, An inner shape cutting step for cutting the inner shape of the outer shape processing base 30 subjected to the surface treatment to obtain a product base 40 and a component assembling step for assembling a functional component to the product base 40 having the inner shape cut are sequentially provided. This is a method for manufacturing a powertrain product.

  Thereby, surface treatment can be performed without leaving foreign matter in the powertrain product. That is, the quality of the powertrain product can be improved.

  According to a second aspect of the present invention, in the first aspect of the present invention, the treatment method in the surface treatment step is performed by injecting and colliding the coated metal powder onto the surface of the outer shape processing base 30. It is characterized by a rust prevention method in which an element is activated and adsorbed on the surface of the outer shape processing base 30 to diffuse and penetrate.

  Thereby, in power train product manufacture, a rust prevention process can be performed in-line. As a result, the cost can be reduced without the powertrain product manufacturing process being divided.

  In addition, the code | symbol attached | subjected above is an example which shows a corresponding relationship with the specific embodiment as described in embodiment mentioned later.

It is a figure which shows the flow of the conventional manufacturing process of a powertrain product. It is a figure which shows the flow of the manufacturing process of the power train product by the comparison technique used as the foundation of this invention. It is a figure which shows the flow of the manufacturing process of the powertrain product by this invention. It is a figure which shows the schematic shape in each process in the case of manufacturing an injector with the manufacturing method of the power train product of this invention.

  FIG. 1 is a diagram showing a flow of a manufacturing process of a conventional powertrain product, and FIG. 2 is an explanatory diagram showing a flow of a comparative technique that is the basis of the present invention. This comparative technique is obtained by applying the PIP method of Patent Document 2 to the surface treatment in the method for manufacturing a powertrain product described in Patent Document 1. This point is different from the conventional method for manufacturing a powertrain product.

  In this comparative technique, it is possible to rust-proof the power train product after cutting in-line. However, in this case, due to the nature of the PIP method in which the coated metal powder is jetted and collided, the elements in the composition of the coated metal powder are activated and adsorbed on the surface of the product to be treated and diffused and penetrated. Foreign matter may remain inside the product, causing quality problems.

  In order to cope with the above-mentioned problem, the present invention performs cutting of the outer diameter after forging the material, then performing surface treatment before cutting the inner shape, and then cutting the inner shape. It is characterized by.

  By setting it as such a process, even if it uses processing, such as a PIP method, as a surface treatment, generation | occurrence | production of the quality defect that a foreign material remains inside a powertrain product can be suppressed.

  Since the inner shape is cut after the rust prevention treatment, the rust prevention treatment is not performed on the inner side of the powertrain product.

  Here, the purpose of performing the rust prevention treatment in the manufacturing process of the power train product is to prevent red rust caused by the outside being exposed to the atmosphere. That is, rust prevention treatment is performed in order to solve the problem of appearance due to red rust and the problem of poor tightening of the screw portion.

  And, after the cutting process, since the rust-proof oil is applied after ASSY assembly, at the time of shipment, the inside is in a state in which the rust-proof oil is applied, and when actually attached to the car and used, Since the interior is always exposed to light oil, there is no need to worry about rusting. Therefore, if the outer side of the power train product is subjected to rust prevention treatment, there is no problem even if the inner side is not subjected to rust prevention treatment.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 3 and 4, taking the manufacture of an injector as an example. About each embodiment, the same code | symbol is attached | subjected to the part of the same structure, and the description is abbreviate | omitted. Also for the comparative technique that is the basis of the present invention, the same reference numerals are given to the same components, and the description thereof is omitted.

  FIG. 3 is a diagram showing a flow of the manufacturing process of the present invention. FIG. 4 is a view showing the outer shape of the injector at each step when the injector is manufactured using the present invention.

  First, the raw base 20 of the injector is manufactured from the rod-shaped material 10 (FIG. 4A) in the forging process (FIG. 4B). By manufacturing the rough shape of the product in the forging process, the margin 32 in the cutting process is reduced, so that the cost can be reduced.

  Next, in the normalizing and tempering process, the entire unprocessed base 20 obtained in the forging process is subjected to a normalizing and tempering process so as to have a hardness capable of cutting.

  Subsequently, in the outer shape cutting step, the unprocessed base 20 that has been subjected to the normalizing and tempering process is subjected to cutting, and the margin 32 is cut to form the outer shape processing base 30 that forms the outer shape of the injector (FIG. 4 ( c)). At this stage, only the outer shape of the injector is formed, and the inner shape such as the sliding hole is not processed.

  Subsequently, a surface treatment is performed on the outer shape processing base 30 in a surface treatment process. As the surface treatment, for example, a PIP method can be used.

  The PIP method does not require a plating solution made of molten liquid metal and can be surface-treated at room temperature, so it can be easily incorporated into the powertrain product manufacturing process line, and in-line rust prevention treatment Is possible. As a result, the lead time can be shortened and labor costs can be reduced without dividing the process, and the cost can be greatly reduced.

  As an example of a specific process, for example, a nozzle having a diameter of about 10 mm provided at a position about 150 mm away from the material is provided, and Cr or Sn having an average particle diameter of about 50 μm is applied as a coated metal powder to about 80 m / sec. By spraying toward the material at an injection speed of about 0.4 MPa, an antirust treatment can be performed.

  In this case, due to the nature of the process of injecting the coated metal powder at a high pressure, there is a concern that foreign matter may be generated, but the outer shape processing base 30 has not yet processed the inner shape. The above problem does not occur.

  Subsequently, in the inner shape cutting step, the sliding hole 42, the screw portion, and the like are formed by cutting on the base 3 that has been subjected to the PIP process to obtain the product base 40 (FIG. 4D).

  Thereafter, functional parts such as a valve unit are assembled in the part assembling process, and the manufacture of the injector is completed.

  In addition, after an internal shape cutting process, in order to raise hardness, you may perform a quenching tempering process and an induction hardening process.

  As described above, according to the process of the present invention, the surface treatment is performed after the outer shape cutting, and then the inner shape cutting is performed, so that the foreign matter remains in the power train product and the quality is deteriorated. Does not occur. Furthermore, by using the PIP method, the rust prevention treatment can be performed in-line, and the manufacturing cost can be greatly reduced.

  Here, the embodiment of the present invention has been described by taking the injector manufacturing process as an example, but the present invention is not limited to the description of the embodiment of the present invention. For example, it can be applied to the manufacture of common rails. It goes without saying that various modifications are included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.

10 Material 20 Raw base 30 External processing base 32 Allowance 40 Product base 42 Sliding hole

Claims (2)

A forging process in which a bar-shaped material 10 is forged into a raw base 20;
A normalizing and tempering step of normalizing and tempering the raw base 20;
An outer cutting step of cutting the outer shape of the unprocessed base 20 subjected to normalization and tempering to obtain the outer shape processing base 30;
A surface treatment step of performing a surface treatment on the outer shape processing base 30 obtained by cutting the outer shape;
Cutting the inner shape of the outer shape processing base 30 subjected to the surface treatment to obtain a product base 40;
A component assembling step of assembling a functional component to the product base 40 cut from the inner shape;
The manufacturing method of the power train product characterized by including. The surface treatment in the surface treatment step is
The surface of the outer shape processing base 30 is injected with a coated metal powder to collide,
The method for producing a powertrain product according to claim 1, wherein the element in the composition of the coated metal powder is activated and adsorbed on the surface of the outer shape processing base 30 to diffuse and penetrate.

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