JP2001221136A - Method for processing nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly precisely and efficiently process a rotor seating surface in a method for manufacturing a nozzle for a fuel injection valve consisting of a valve seat surface for seating of a valve element, an orifice for measuring fluid, and the rotor seating surface for seating of a fuel rotor guiding and retaining the valve element. SOLUTION: Finish machining of a surface to be reference inside the nozzle is performed in advance, and, with treating the surface finish-machined as a reference surface, a tool-holding tool gripping a tool for finish machining of the rotor seating surface at a tip is inserted and rotated to perform finish machining of the rotor seating surface placed at the inner side of the nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method of manufacturing a nozzle for ejecting a fluid, and more particularly to a method of manufacturing a nozzle of a fuel injection valve having an orifice for measuring a flow rate and a fuel swirler for applying a swirling force to fuel.

[0002]

2. Description of the Related Art A single fuel injection valve produces stratified combustion mode and homogeneous combustion mode in a suitable fuel spray form to improve fuel efficiency and output, and obtain stable engine performance in a wide range of rotation range. In the fuel injection valve of the inner injection type, as described in JP-A-11-159421, a fuel swirling means for applying a swirling force to the fuel passing around the valve body upstream of the valve seat portion, and a nozzle for injecting the swirling fuel. Is provided. This nozzle requires the coaxiality and squareness of the inner surface of the nozzle and the valve seat surface, the squareness of the swirler seating surface where the fuel swirling means is seated on the nozzle and the squareness of the nozzle inner diameter, and the surface roughness of the swirler seating surface. As a method of processing the inside of the nozzle, a grinding process using an internal grinding machine using a small-diameter grindstone as a tool has been used.

[0003]

In the conventional method for processing a nozzle, it is necessary to machine the nozzle inner surface and the swivel seating surface with the same tool in order to satisfy the perpendicularity between the nozzle inner surface and the swirler seating surface. However, when the nozzle becomes longer, the tool becomes longer, and there is a problem in that the machined surface is deteriorated due to a decrease in tool rigidity, and the machining efficiency is also reduced.

The present invention overcomes the above-mentioned problems, and comprises a valve seat surface on which a valve body is seated, an orifice for measuring a fluid, and a swirler seating surface on which a fuel swirler for guiding and holding the valve body is seated. An object of the present invention is to process a swivel seating surface with high accuracy and high efficiency in a method of manufacturing a valve nozzle.

[0005]

Means for Solving the Problems The basic invention proposed this time to solve the above problems is as follows. That is,
Finishing of a reference surface inside the nozzle is performed in advance, and a tool holder holding a tool for finishing the swivel seating surface is inserted into the tip portion with the finished surface as a reference surface. Is rotated to finish the swivel seating surface located at the back of the nozzle.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention. The workpiece holder 4 is attached to the chuck base 1 by the floating holder 2 and the floating holder 3 in the XY directions in FIG.
Floating holders 2 and 3 in the X and Y directions in a plane
The work 5 is held by the work holder 4. The tool 9 on the swivel seating surface 7 of the workpiece 5 is rotatably held by a rotation axis 10, and the rotation axis 10 is
1, the floating holder 11 is movably gripped within the movable range of the floating holder 11 in the XY plane of the drawing, and the floating holder 11 is held by the tool holder 12;
2 slides on the reference surface of the workpiece 5 and is held by the floating holder 13 so as to be movable within the movable range of the floating holder 13 in the XY plane of the drawing, and the floating holder 13 is moved by the spindle motor 14. It is held rotatably around the rotation axis.

The operation of the present invention will be described with reference to FIGS. The work holder 4 is provided on the chuck base 1 shown in FIG.
The floating holder 2 and the floating holder 3 are movably gripped within the movable range of the floating holders 2 and 3 in the X and Y directions in the XY plane of the drawing. , The workpiece 5 is held. While rotating by the spindle motor 14,
A Z-axis drive motor (not shown) is driven to insert a tool holder 12 holding a tool 9 for machining the swivel seating surface 6 of the workpiece 5 into the workpiece 5. Tool holder 1
As described above, 2 is held by the floating holder 13 so as to be movable within the movable range of the floating holder 13 in the XY plane of the drawing, and there is a deviation between the axis of the tool holder 12 and the axis of the workpiece 5. Even if it occurs, the tool holder 12 slides on the reference surface of the workpiece 5 while being appropriately moved in the XY plane, and is smoothly inserted. As shown in FIG. 3, the surface of the tool 9 is covered with hard particles such as CBN or diamond. When the tool 9 is in contact with the swivel seating surface 7 of the workpiece 5, a predetermined pressure is applied. Then, the swivel seating surface 7 is processed. The tool 9 is held on a tool holder 12 by a rotation axis 10 and a floating holder 11, and the tool holder 12 slides on a reference surface of the workpiece 5, so that the swivel seating surface 7 and the workpiece The squareness of the reference plane 8 of 5 is good. Further, since the tool 9 processes only the swivel reference surface 7, the rotation axis 10 holding the tool 9 can be shorter than the entire length of the workpiece 5, and the tool rigidity is improved. Therefore, the processed surface of the swivel seating surface 7 is free from chatter and the surface roughness is improved.

[0008]

As is apparent from the above description,
According to the present invention, a swirl method is used in a method for manufacturing a nozzle of a fuel injection valve comprising a valve seat surface on which a valve body is seated, an orifice for measuring fluid, and a swirler seating surface on which a fuel swirler for guiding and holding the valve body is seated. The child seating surface can be processed with high accuracy and high efficiency.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view at the time of processing a nozzle according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view at the time of processing a nozzle according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view at the time of processing a nozzle according to an embodiment of the present invention.

[Description of reference numerals] 1 ... chuck base, 4 ... workpiece holder, 5 ... workpiece,
7: swivel seating surface, 8: reference surface, 9: tool, 11: floating holder, 13: floating holder, 14
... Spindle motor.

Claims (1)

[Claims] 1. A method for manufacturing a nozzle of a fuel injection valve comprising a valve seat surface on which a valve body is seated, an orifice for measuring fluid, and a swirler seating surface on which a fuel swirler for guiding and holding the valve body is seated. A method of processing a nozzle of a fuel injection valve, wherein a tool is pressed against the swirler seating surface at a constant pressure using the inner diameter of the nozzle as a guide.