JPH0578477U - Grinding wheel for engine valve grinding - Google Patents

Abstract

(57) [Summary] [Purpose] To enable multiple grinding operations with one grinding wheel. [Structure] Since a plurality of grinding surfaces (4) and (5) are formed on the surface of one disk-shaped grinding wheel (21), one grinding wheel (21) can perform a plurality of grinding operations having different properties. The grinding work is improved because it is not necessary to replace the grinding wheel (21) each time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grinding wheel for engine valve grinding, which is used when grinding each part of the surface of an engine valve.

[0002]

[Prior Art]

 There are various machining processes to finish a prototype engine valve molded product (hereinafter referred to as a work) by forging into a finished product.During that process, for example, rough grinding of the umbrella surface of the work piece is performed. There is grinding work with a grinding wheel of a grinder.

On the side surface of the disk-shaped grinding wheel used for the work grinding work, one kind of grinding surface having a property suitable for rough grinding of the umbrella surface is formed, and this grinding surface allows grinding a predetermined number of times. After that, the work is transferred to the next grinding machine by the transfer device in order to grind the other part of the work.

[0004]

[Problems to be solved by the device]

 However, since the conventional grinding wheel is provided with only one grinding surface on the side surface, only a single grinding operation can be performed, and there is a problem that the working efficiency is poor. The present invention has been made to solve the above-mentioned problems, and a grinding wheel for engine valve grinding has improved work efficiency by enabling a single grinding wheel to perform a plurality of grinding operations with different processing requirements. The purpose is to provide a car.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a disk-shaped grinding wheel for engine valve grinding, which is mounted on a grinding machine and grinds the outer surface of each part of the engine valve. It is characterized in that a plurality of grinding surfaces having different properties suitable for grinding a portion to be ground are formed.

[0006]

[Action]

 Since a plurality of grinding surfaces are formed on the surface of one disk-shaped grinding wheel, it is possible to perform grinding work of different properties with one grinding wheel, and it is not necessary to replace the grinding wheel each time. Therefore, the grinding work is improved.

[0007]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which an original engine valve product (hereinafter referred to as a work) (1) is gripped by a gripping device (not shown) of a grinder (2) and ground. First, the shaft end (1a) of the work (1) is cut by pressing the grinding wheels (4) and (5) of the single grinding wheel (3) mounted on the board (2). The processing conditions of the process and the second process for chamfering the cut shaft end (1a) are shown.

The grinding wheel (3) has a base metal (6) having a cylindrical portion (6b) in the front center of the disc portion (6a), and an outer periphery of the disc portion (6a) of the base metal (6). Cubic boron nitride (hereinafter referred to as CBN) is electrodeposited on the surface and the front and rear surfaces of the outer peripheral portion to form a first grinding surface (4) which is a CBN grinding wheel surface, and a base metal (6 ) Is fitted with a grindstone (7), which is made of silicon carbide and has a frustoconical outer peripheral surface that is made of silicon carbide, and its rear surface is fixed to the disc portion (6a). The second grinding surface (5) is formed by the tapered portion of the outer peripheral surface of the grindstone (7).

When forming the first ground surface (4) and the second ground surface (5), the properties such as the material of the abrasive grains, the grain size, and the degree of bonding are different from each other, which are suitable for the processing requirements in each process. It is better to set it in the thing. In particular, when performing cutting or surface grinding as in the first step, a CBN wheel surface with less wear or a wheel surface using high-hardness abrasive grains is used. It is better to use a relatively inexpensive grindstone surface that uses grains.

According to the above grinding wheel (3), two grinding surfaces (4) (5) having different properties are formed on the surface of the grinding wheel (3). Grinding work of portions having different machining requirements can be performed simultaneously or separately, and it is not necessary to replace the grinding wheel (3) each time, so the grinding work efficiency is improved.

Next, a second embodiment shown in FIG. 2 will be described. The same members as those shown in the first embodiment are designated by the same reference numerals and detailed explanations thereof are omitted (the same applies to other embodiments below). FIG. 2 shows the third step of rough grinding the umbrella surface (1b) of the work (1) and the fourth curved surface grinding of the neck (1c) of the work (1) with a single grinding wheel (10). It shows the processing status with the process.

The grinding wheel (10) is provided with a base metal (11) having annular projections (11a) formed on the front and rear surfaces of the outer peripheral portion, and the surface of the projections (11a) has a CBN grinding particle with a large grain size. The grains are electrodeposited and form the first grinding surface (12). On the outer peripheral surface of the base metal (11), an annular grindstone (13) made of fused alumina and having an arc-shaped cross-section is formed on the outer peripheral surface of the base metal (11). The grindstone (13) is attached so as to fit into the annular recess (11b), and the outer peripheral surface of the arcuate section of the grindstone (13) constitutes the second grinding surface (14).

According to this grinding wheel (10), rough grinding (third step) of the umbrella surface (1b) of the work (1) is performed by the first grinding surface (12) and second grinding surface (14). Thus, the curved surface grinding (4th step) of the neck portion (1c) of the work (1) can be performed under different processing conditions suitable for each step.

In addition, in the second embodiment, the grinding wheel (10) has a symmetrical shape in the front-rear direction with respect to the plane that divides the plate thickness into two parts. When either one of the ground surfaces (12) is worn, the life of the grinding wheel (10) can be doubled by reversing the front and back of the grinding wheel (10) and reattaching it to the grinding machine (2). When the second ground surface (14) is worn, it may be dressed in the same manner as a conventional grindstone.

FIG. 3 shows a third embodiment of the present invention. FIG. 3 shows the processing conditions of the fifth step of finishing grinding the umbrella surface (1b) by the single grinding wheel (15) and the sixth step of finishing grinding of the umbrella portion margin of the work (1). It shows.

The grinding wheel (15) is provided with a base metal (12) having an annular recess (16) opening outwardly on the outer peripheral portion, and the front and rear surfaces of the outer peripheral portion of the base metal (12). CBN abrasive grains having a small grain size are electrodeposited to form the first ground surface (17).

An annular grindstone (18), which is made of fused alumina and has a substantially convex cross section, is fitted into the recess (16) and has a protrusion (18a) protruding outward. The second grinding surface (19) is formed at the base end of the protrusion (18a) of the grindstone (18).

According to this grinding wheel (15), finish grinding (fifth step) of the umbrella surface (1b) of the work (1) is performed by the first grinding surface (17) and the second grinding surface (19). Thus, the finish grinding of the umbrella portion margin of the work (1) can be performed under different processing conditions suitable for each process.

Also in this third embodiment, similarly to the second embodiment, the grinding wheel (15) has a symmetrical shape and a front and rear first grinding centered on a plane that divides the plate thickness into two equal parts. When one of the surfaces (17) is worn, the life of the wheel (15) can be doubled by reversing the front and back of the grinding wheel (15) and reattaching it to the grinding machine (2). Further, when the second ground surface is worn, dressing may be performed in the same manner as a conventional grindstone.

FIG. 4 shows a fourth embodiment of the present invention, which is the same as the eighth step of grooving and grinding the cotter groove (20) of the shaft end portion (1a) of the work (1) and the cotter groove ( It shows the processing status with the ninth process of groove chamfering in 20).

That is, the grinding wheel (21) has a disk-shaped base metal (22) whose outer peripheral surface has an arc-shaped cross section, and the CBN abrasive grains are electrodeposited on the arc surface of the base metal (22). And constitutes the first ground surface (23). Further, a slightly thick disk-shaped grindstone (24) made of silicon carbide or the like is fixed to the front surface of the base metal (22), and the second grinding is carried out at two central portions of the outer peripheral surface of the grindstone (24). It constitutes the plane (25).

According to this grinding wheel (21), grooving grinding (seventh step) of the cotter groove (20) of the shaft end portion (1a) of the work (1) is performed on the first grinding surface (23). Similarly, the chamfering of the cotter groove (20) can be performed by the second grinding surface (25) (eighth step), and the grinding can be performed under different processing conditions suitable for each step.

FIG. 5 shows a fifth embodiment of the present invention. Fig. 5 shows the working conditions of finishing grinding of the tip surface (1c) of the workpiece (1) (9th process) and chamfering of the corners (1f) of the shaft end (10th process) using the grinding wheel (26). Is represented.

The grinding wheel (26) includes a base metal (29) composed of a slightly thick disc portion (27) and an annular protrusion (28) provided on the outer peripheral surface of the disc portion (27). .. On the taper portion (28a) at the tip of the protrusion (28) of the base metal (29), abrasive grains of CBN having a small grain size are electrodeposited to form the first ground surface (30), and The second grinding surface (31) is formed on the front and rear surfaces of the outer circumference of the disk portion (27) by electro-depositing abrasive grains made of CBN which are slightly larger than those of the first grinding surface (30). ing.

As described above, in the present embodiment, the grain sizes of the abrasive grains on the first grinding surface (30) and the second grinding surface (31) are made different from each other, thereby making it different from the first to fourth embodiments. Similarly, it is possible to perform the grinding work of the two work (1) with different processing requirements at the same time or separately, and it is not necessary to replace the grinding wheel (26) each time, so the grinding work efficiency is improved. improves.

It should be noted that the present invention is not limited to the grindstone surface shown in each of the embodiments, and the point is that, depending on the processing requirements, the CBN grindstone surface or the grindstone surface using high hardness abrasive grains, silicon carbide, or molten aluminum. It suffices to form a grindstone surface using abrasive grains such as, and it is possible to form a grindstone surface having different properties by CBN abrasive grains or other abrasive grains. Further, the shape of the grinding wheel in each of the embodiments is not limited.

[0027]

[Effect of the device]

 The present invention has the following effects. (a) Since a plurality of grinding surfaces different from each other are formed on the surface of the grinding wheel, it is possible to carry out the grinding work simultaneously or separately for a plurality of portions of the work which have different processing requirements. (b) Since different grinding surfaces are formed on the grinding wheel, different grinding operations can be performed at the same time, improving work efficiency.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a situation during grinding of a work according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway plan view showing a situation during grinding of a work according to a second embodiment of the present invention.

FIG. 3 is a partially cutaway plan view showing a situation during grinding of a work according to a third embodiment of the present invention.

FIG. 4 is a partially cutaway plan view showing a situation during grinding of a work according to a fourth embodiment of the present invention.

FIG. 5 is a partially cutaway plan view showing a situation during grinding of a work according to a fifth embodiment of the present invention.

[Explanation of symbols]

(1) Work (engine valve) (1a) Shaft end (1b) Umbrella surface (1c) Neck (1d) Margin (1e) Tip surface (2) Grinding machine (3) Grinding wheel (4) First grinding surface ( 5) Second grinding surface (6) Base metal (6a) Disk part (6b) Cylindrical part (7) (13) Grindstone (11) Base metal (11a) Ridge (11b) Recess (12) First grinding surface (14) Second grinding surface (16) Recess (17) First grinding surface (18) Grinding wheel (18a) Projection (19) Second grinding surface (20) Cutter groove (21) Grinding wheel (22) Base metal ( 23) 1st grinding surface (24) Grinding wheel (25) 2nd grinding surface (26) Grinding wheel (27) Disk part (28) Projection part (28a) Tapered part (29) Base metal (30) First grinding surface (31) Second grinding surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Hidenori Sato 2958 Ishikawa, Fujisawa City, Kanagawa Prefecture Fuji Valve Co., Ltd. Fujisawa Factory

Claims (3)

[Scope of utility model registration request] 1. A disk-shaped grinding wheel for engine valve grinding, which is mounted on a grinder and grinds the outer surface of each part of an engine valve, the surface of which is to be ground to be machined with different machining requirements. A grinding wheel for engine valve grinding, comprising a plurality of grinding surfaces having different properties suitable for each other. 2. The grinding wheel for engine valve grinding according to claim 1, wherein the grindstone is symmetrical about a plane that divides the plate thickness into two equal parts. 3. The grinding wheel for engine valve grinding according to claim 1, wherein at least one grinding surface is formed of CBN abrasive grains.