JP7625442B2 - Deburring device - Google Patents

Description

The present invention relates to a water jet type deburring device that removes burrs from resin molded products.

In modern society, there are many industrial products on the market that are made by molding materials into desired shapes. During this molding process, some of the material may overflow from the desired shape, resulting in excess protrusions called burrs on the molded surface of the molded product.

For example, in molded products whose outer shape is determined by molding, burrs (so-called peripheral burrs) often form that protrude from the molding surface that corresponds to the outer peripheral surface of the molded product, and in products in which through holes are formed by molding, burrs (so-called hole burrs) often form that protrude from the molding surface that corresponds to the inner wall surface of the through hole. Therefore, after molding, a deburring process is required to remove such burrs from the molded product.

Here, as one method of deburring, water jet deburring has been known in the past, in which burrs are removed by spraying water onto the molded product to be deburred (see, for example, Patent Documents 1 and 2). Water jet deburring can remove burrs simply by spraying water, and has the advantage of being less time-consuming and more efficient than deburring methods that remove individual burrs with cutting tools, etc.

Japanese Patent Application Publication No. 3-178385 Japanese Patent Application Publication No. 4-224912

However, with water jet deburring, the force of the jetted water acts not only on the area where the burr is present but also on the surrounding areas, which means there is a risk of damaging the molded product being deburred. For this reason, water jet deburring has traditionally been applied to molded products that have a relatively high resistance to the force of the jetted water, such as metal molded products made by forming metal materials, and has been considered unsuitable for molded products with low durability.

For example, resin molded products made by molding resin materials have lower durability than metal molded products. For this reason, deburring methods other than the water jet method, such as deburring using ultrasonic waves or cutting tools, are often used for resin molded products.

However, resin products obtained from resin molded products are industrial products that are in high demand and are used in a variety of fields, and from the perspective of improving productivity, there is a strong desire to apply water jet deburring, which provides a highly efficient deburring process, even to resin molded products.

In consideration of the above circumstances, the present invention aims to realize a water jet type deburring device that removes burrs from resin molded products while minimizing damage to the resin molded products caused by the spray of water.

To solve the above problems, the present invention provides the following deburring device.

[1] A water jet type deburring device that removes burrs from a resin molded product having a molding surface from which burrs protrude, at least a portion of which is plate-shaped, by spraying water onto the resin molded product, the deburring device comprising: a first jig having a flat placement surface on which the resin molded product is placed with the bottom surface of the resin molded product that connects to the molding surface in contact with the placement surface; a second metal jig having a flat pressing surface that sandwiches the resin molded product with the molding surface exposed between the pressing surface and the placement surface of the first jig, and covers the top surface of the resin molded product that connects to the molding surface on the opposite side to the bottom surface up to the vicinity of the molding surface; and a water spray unit that sprays water from the second jig side toward the burrs on the molding surface.

[2] The resin molded product is molded with its outer peripheral surface as the molding surface, the burr is a peripheral burr protruding from the outer peripheral surface, the water injection unit is disposed directly above the second jig on a plane along the outer peripheral surface, and the water injection unit injects water from the tip of the water injection unit with a predetermined angular width. The deburring device described in [1].

[3] The resin molded product has a through hole molded with the inner wall surface as the molding surface, the burr is a hole burr protruding from the inner wall surface of the through hole, the first jig has a first communication hole formed therein that communicates with the through hole when the resin molded product is sandwiched between the first jig and the second jig, and the second jig has a second communication hole formed therein that communicates with the through hole when the resin molded product is sandwiched between the first jig and the second jig, the second communication hole having an inflow opening through which water injected from the water injection unit flows in and an outflow opening connected to an opening of the through hole on the second jig side and through which the water flowing in from the inflow opening flows out into the through hole. The deburring device according to [1] or [2].

[4] The deburring device according to [3], in which the second jig has a second communication hole in which the inlet opening has a larger opening area than the outlet opening.

[5] The deburring device according to [4], wherein the second jig has a second communication hole in which at least a portion of the inner wall surface narrows while inclining in a tapered shape from the inlet opening side toward the outlet opening side.

[6] The deburring device according to [4] or [5], wherein the second jig has a second communication hole in which at least a portion of the inner wall surface of the second jig is curved and narrowed from the inlet opening side toward the outlet opening side.

In the deburring device of the present invention, the upper surface of the resin molded product is covered with a second metal jig, thereby preventing the resin molded product from being damaged by water sprayed from the water spray unit. As a result, the present invention makes it possible to remove burrs from the resin molded product while minimizing damage to the resin molded product caused by spraying water.

1 is a schematic diagram showing a configuration of a deburring device according to an embodiment of the present invention; 2 is a schematic explanatory diagram of hole burr removal in the deburring device of FIG. 1 . FIG. 3 is a schematic diagram of a deburring device including a second jig in which a second communication hole having a different shape from the second communication hole in FIG. 2 is formed; FIG. 4 is an enlarged view of the vicinity of a location where a second communication hole is formed in the second jig in FIG. 3 . FIG. 5 is a diagram showing a second jig made of metal in which a second communication hole having a shape different from that in FIG. 4 is formed. FIG. 6 is a diagram showing a second jig made of metal in which a second communication hole having an inner wall surface having a shape combining the tapered shape of FIG. 4 and the curved shape of FIG. 5 is formed. FIG.

The following describes an embodiment of the present invention with reference to the drawings. It should be understood that the present invention is not limited to the following embodiment, and that appropriate design changes and improvements may be made based on the ordinary knowledge of a person skilled in the art without departing from the spirit of the present invention.

Figure 1 is a schematic diagram showing the configuration of a deburring device 10 according to one embodiment of the present invention.

The deburring device 10 is a water jet type deburring device that removes burrs from a resin molded product by spraying water onto the resin molded product, at least a portion of which is plate-shaped and has a molding surface from which burrs protrude.

Note that the term "resin molded product" here refers to a molded product at least partially molded from a resin material. In other words, "resin molded product" includes not only molded products entirely made of resin, but also molded products that are partially molded from a resin material and other portions made of a material other than resin (such as metal). Figure 1 shows a resin molded product 4, as an example of a resin molded product to be deburred, which is made of a main body 41 that spreads out in a flat shape and a plate-shaped resin seal portion 42 that seals the end of the main body 41.

The resin molded product 4 (or more precisely, the sealing portion 42, which is a part of it) is molded from a resin material with the outer peripheral surface 4c as the molding surface, and during this molding, as shown in Figure 1, an outer peripheral burr X protruding from the outer peripheral surface 4c may occur. Also, as described below, the resin molded product 4 has a through hole 40 (not shown in Figure 1, see Figures 2 and 3 below) molded in the sealing portion 42, and during this molding, a hole burr Y (see Figure 2 below) protruding from the inner wall surface 4d of the through hole 40 may occur.

The components of the deburring device 10 used to remove burrs during molding are a first jig 1, a second jig 2, and a water injection unit 3. Below, these components will be explained with reference to Figure 1, using the case of removing peripheral burrs X as an example.

The first jig 1 has a flat placement surface 1a. When removing peripheral burrs X, the resin molded product 4 is placed with the bottom surface 4b of the resin molded product 4 in contact with the placement surface 1a of the first jig 1. Here, the bottom surface 4b of the resin molded product 4 is connected to the outer peripheral surface 4c, which is the molding surface, and in this positioned state, the molding surface (outer peripheral surface 4c in FIG. 1) is exposed to the outside.

The second jig 2 is a metal member having a flat pressing surface 2a. When removing peripheral burrs X, the second jig 2 sandwiches the resin molded product 4 with the molding surface (outer peripheral surface 4c in FIG. 1) exposed between this pressing surface 2a and the placement surface 1a of the first jig 1. The second jig 2 covers the upper surface 4a of the resin molded product 4 sandwiched in this manner up to the vicinity of the molding surface (outer peripheral surface 4c in FIG. 1). Here, the upper surface 4a of the resin molded product 4 is the surface of the resin molded product 4 opposite the above-mentioned lower surface 4b, and is the surface that connects with the molding surface (outer peripheral surface 4c in FIG. 1).

The water injection unit 3 injects water from the tip 31 toward the peripheral burr X on the molding surface (peripheral surface 4c in FIG. 1) from the side of the second jig 2. This water injection removes the peripheral burr X from the molding surface (peripheral surface 4c in FIG. 1).

Next, we will explain how to remove hole burrs.

Figure 2 is a schematic diagram illustrating hole burr removal using the deburring device 10 of Figure 1.

As shown in FIG. 2, in the resin molded product 4, a through hole 40 is molded in the sealing portion 42 (not shown in FIG. 1), and FIG. 2 shows that a hole burr Y generated during this molding protrudes from the inner wall surface 4d of the through hole 40.

When removing hole burrs Y, as in the case of removing peripheral burrs X in FIG. 1, the resin molded product 4 is placed with its underside 4b in contact with the placement surface 1a of the first jig 1 as shown in FIG. 2. Here, the underside 4b of the resin molded product 4 is connected to the inner wall surface 4d of the through hole 40, which is the molding surface, and when placed in this manner, the molding surface (inner wall surface 4d in FIG. 2) is exposed to the outside.

When removing hole burrs Y, similar to the removal of outer peripheral burrs X in FIG. 1, the second jig 2 sandwiches the resin molded product 4 with its molding surface (inner wall surface 4d in FIG. 2) exposed between the pressing surface 2a and the placement surface 1a of the first jig 1 as shown in FIG. 2. The second jig 2 covers the upper surface 4a of the resin molded product 4 thus sandwiched up to the vicinity of the molding surface (inner wall surface 4d in FIG. 2) that connects to the upper surface 4a.

The water injection unit 3 (not shown in FIG. 2, see FIG. 1) injects water from the second jig 2 side toward the hole burr Y on the molding surface (inner wall surface 4d in FIG. 2) in the direction of the bold arrow in FIG. 2. This water injection removes the hole burr Y from the molding surface (inner wall surface 4d in FIG. 2).

As described above in Figs. 1 and 2, in the deburring device 10, the upper surface 4a of the resin molded product 4 is covered by the second metal jig 2, thereby preventing the resin molded product 4 from being damaged by the water sprayed from the water spray unit 3. As a result, the deburring device 10 can remove burrs (peripheral burrs X in Fig. 1 and hole burrs Y in Fig. 2) from the resin molded product 4 while minimizing damage to the resin molded product 4 caused by sprayed water.

As shown in FIG. 1, in the deburring device 10, when removing the peripheral burr X, the water injection unit 3 is positioned directly above the second jig 2 on a plane along the peripheral surface 4c, and water is injected from the tip 31 of the water injection unit 3 with a predetermined angular width θ.

By having the water sprayed from the water spray unit 3 spread over a certain angle θ, the water is more likely to hit the peripheral burrs X, improving the efficiency of deburring.

Here, in Figure 1, the predetermined angle width θ is described as the width of the angle of the water injection direction when the tip 31 of the water injection unit 3 is the angular center. In addition, the distance L between the tip 31 of the water injection unit 3 and the resin molded product 4, and the water injection range D in a plane perpendicular to the injection direction (the up-down direction in Figure 1) at a point distance L from the tip 31 (i.e., near the outer peripheral burr X) are also described. The water injection unit 3 injects water while rotating in the direction of the arrow in the figure, which prevents unevenness in the amount of water injected depending on the direction.

In the deburring device 10, as shown in FIG. 2, the first jig 1 has a first communication hole 11 that communicates with the through hole 40 when the resin molded product 4 is sandwiched between the first jig 1 and the second jig 2. The second jig 2 has a second communication hole 21 that communicates with the through hole 40 when the resin molded product 4 is sandwiched between the first jig 1 and the second jig 2. The second communication hole 21 has an inflow opening 21a through which water sprayed from the water spray unit 3 flows in, and an outflow opening 21b that is connected to the opening 41a on the second jig 2 side of the through hole 40 and through which the water that flows in from the inflow opening 21a flows out into the through hole 40.

The first communication hole 11 and the second communication hole 21 allow water to continue to flow up to the location of the hole burr Y on the inner wall surface 4d of the through hole 40. At this time, the second jig 2 covers the resin molded product 4 except for the vicinity of the opening 41a of the through hole 40, so that damage to the resin molded product 4 caused by water passing through the second communication hole 21 and the first communication hole 11 is avoided.

In FIG. 2, the second communication hole 21 has a straight shape that extends straight in the thickness direction of the resin molded product 4 (the vertical direction in FIG. 2), but the same effect can be obtained even if a second communication hole of another shape is used. Below, a deburring device equipped with a second jig in which a second communication hole of a different shape is formed will be described.

Figure 3 is a schematic diagram of a deburring device 20 equipped with a second jig 5 in which a second communication hole 51 having a different shape from the second communication hole 21 in Figure 2 is formed, and Figure 4 is an enlarged view of the vicinity of the location where the second communication hole 51 is formed on the second jig 5 in Figure 3.

The deburring device 20 in FIG. 3 has the same components as the deburring device 10 in FIG. 1 and FIG. 2, except that a second communication hole 51, which has a different shape from the second communication hole 21 in FIG. 2, is formed in the second metal jig 5. In FIG. 3, the same reference numerals are used for the same components, and the explanation of the same components is to be referred to the explanation of FIG. 1 and FIG. 2, and the duplicate explanation is omitted here. In addition to the first jig 1 and the second jig 5, the deburring device 20 in FIG. 3 also has a water injection unit 3 (see FIG. 1), which is not shown in FIG. 3, and this water injection unit 3 injects water in the direction of the thick arrow in FIG. 3 to remove hole burrs Y from the molding surface (inner wall surface 4d in FIG. 3).

When removing hole burrs Y, as shown in FIG. 3, the second jig 5 of the deburring device 20, like the second jig 2 in FIG. 2, sandwiches the resin molded product 4 with the molding surface (inner wall surface 4d in FIG. 3) exposed between the flat pressing surface 5a of the second jig 5 and the placement surface 1a of the first jig 1. The second jig 5 covers the upper surface 4a of the resin molded product 4 thus sandwiched up to the vicinity of the molding surface (inner wall surface 4d in FIG. 3) connected to the upper surface 4a.

For this reason, in the deburring device 20 of FIG. 3, the upper surface 4a of the resin molded product 4 is covered with the second metal jig 5, thereby preventing the resin molded product 4 from being damaged by water sprayed from the water spraying unit 3 (not shown in FIG. 3, see FIG. 1). As a result, in the deburring device 20, like the deburring device 10 of FIGS. 1 and 2, the hole burr Y can be removed from the resin molded product 4 while minimizing damage to the resin molded product 4 caused by sprayed water. The same applies to the peripheral burr X (see FIG. 1).

As shown in FIG. 3, the second jig 5 has a second communication hole 51 that communicates with the through hole 40 when the resin molded product 4 is sandwiched between the second jig 5 and the first jig 1. As shown in FIG. 3 and FIG. 4, the second communication hole 51 has an inflow opening 51a through which water sprayed from the water spray unit 3 flows in, and an outflow opening 51ab that connects to the opening 41a on the second jig 5 side of the through hole 40 and through which the water that flows in from the inflow opening 21a flows out into the through hole 40.

Here, in the second communication hole 51 in Figures 3 and 4, unlike the second communication hole 21 in Figure 2, the inflow opening 51a has a larger opening area than the outflow opening 51ab that connects to the opening 41a of the through hole 40.

In this way, the inflow opening 51a has a larger opening area than the outflow opening 51ab, so that most of the water sprayed from the water spray unit 3 (not shown in FIG. 3) in the direction of the thick arrow in FIG. 3 tends to flow into the second communication hole 21, improving the efficiency of deburring.

3 and 4, at least a part of the inner wall surface 52 of the second communication hole 51 of the second jig 5 is tapered and narrowed from the inflow opening 51a side to the outflow opening 51ab side. More specifically, in the second communication hole 51, of the entire inner wall surface 52 (the entire inner wall surface over the entire length h ₀ of the second communication hole 51), the upper part 52a of the thickness direction length h ₁ from the inflow opening 51a is tapered and narrowed toward the outflow opening 51ab side. In the example of FIG. 3 and FIG. 4, only the upper part 52a of the entire inner wall surface 52 is tapered, but in the present invention, the entire inner wall surface 52 of the second communication hole may be tapered.

By inclining at least a portion of the inner wall surface 52 of the second communication hole 51 into a tapered shape, most of the water sprayed in the direction of the thick arrow in Figure 3 flows more easily into the second communication hole 21, and the efficiency of deburring is further improved compared to the configuration in Figure 2.

3 and 4, the lower portion 52b of the entire inner wall surface 52 of the second communication hole 51 on the side of the remaining outflow opening 51ab has a straight shape extending straight in the thickness direction (vertical direction in FIG. 2) of the resin molded product 4 similar to that of FIG. 2. In particular, in FIG. 4, the upper portion 52a of the inner wall surface 52 of the second communication hole 51 on the side of the inflow opening 51a with an opening diameter _d1 has a tapered shape with an inclination angle width φ, and the remaining lower portion 52b on the side of the outflow opening 51ab with an opening diameter _d2 (where _d1 > _d2 ) has a straight shape.

However, the effect of further improving the efficiency of deburring described above is not limited to the second communication hole 51 having an inner wall surface 52 with a tapered upper portion 52a and a straight lower portion 52b. In other words, there are second communication holes of other shapes in which the inlet opening has a larger opening area than the outlet opening that can achieve the same effect. Below, we will introduce some second jigs in which second communication holes of other shapes are formed.

Figure 5 shows a second metal jig 6 in which a second communication hole 61 of a different shape from that shown in Figure 4 is formed.

At least a part of the inner wall surface 62 of the second communication hole 61 of the second jig 6 in Fig. 5 is curved and narrowed from the inflow opening 61a side to the outflow opening 61b side. More specifically, the second communication hole 61 is curved in a curved shape with a curvature R over the entire inner wall surface 62 (the entire inner wall surface over the entire length h ₀ of the second communication hole 61), and is narrowed from the inflow opening 61a side to the outflow opening 61b side. Here, the outflow opening 61b in Fig. 5 has a smaller opening area than the inflow opening 61a, and is connected to the opening 41a (not shown in Fig. 5, see Fig. 3, etc.) of the through hole 40 of the resin molded product 4, like the outflow opening 51ab in Figs. 3 and 4. In the example of FIG. 5, the entire inner wall surface 62 (the entire inner wall surface over the entire length _h0 of the second communication hole 61) is curved, but in the present invention, only the upper portion of the entire inner wall surface 62, whose thickness direction length from the inlet opening 61a is _h1, may be curved.

By curving at least a portion of the inner wall surface 52 of the second communication hole 51, much of the water sprayed from the water spraying section 3 (not shown in FIG. 5, see FIG. 1) tends to flow into the second communication hole 61, and as with the embodiment of FIG. 4, the efficiency of deburring is further improved compared to the embodiment of FIG. 2.

In addition, the present invention may employ a second jig having a second communication hole with an inner wall surface that has a shape that combines the tapered shape of FIG. 4 and the curved shape of FIG. 5.

Figure 6 shows a second metal jig 7 in which a second communication hole 71 is formed, the second communication hole 71 having an inner wall surface 72 that has a shape that combines the tapered shape of Figure 4 and the curved shape of Figure 5.

In the second communication hole 71 of the second jig 7 in Fig. 6, among the entire inner wall surface 72 (the entire inner wall surface over the entire length _h0 of the second communication hole 71), the upper portion 72a having a length _h1 in the thickness direction from the inflow opening 51a has a tapered shape with an inclination angle width φ, as in Fig. 4. On the other hand, the remaining lower portion 72b on the outflow opening 71b side has a curved shape with a curvature R, as in Fig. 5.

Even when this type of second jig 7 is used, much of the water sprayed from the water spraying section 3 (not shown in FIG. 6, see FIG. 1) tends to flow into the second communication hole 71, and as with the configurations of FIGS. 4 and 5, the efficiency of deburring is improved even more than with the configuration of FIG. 2.

Below, we will explain more specific examples that demonstrate the effects of the present invention. Note that the present invention is not limited in any way by these examples.

Example 1
The deburring device of Example 1 is a specific example of the deburring device 20 of Fig. 3 that is equipped with the second jig 5 of Fig. 4. As described above in the explanation of Fig. 3, the deburring device of Example 1 is equipped with the water injection unit 3 of Fig. 1 (not shown in Fig. 3) in addition to the first jig 1 and the second jig 5 of Fig. 3.

The first jig 1 (see Figs. 1 to 3) of the deburring device of Example 1 is a plate-shaped member made of stainless steel and having a flat arrangement surface 1a. The first jig 1 of the deburring device 20 of Example 1 is formed with a first straight-shaped through hole 11 having an aperture of 2.5 mm.

The second jig 5 (see FIG. 4) of the deburring device of Example 1 is a plate-like member made of stainless steel having a flat pressing surface 5a. The second jig 5 of the deburring device 20 of Example 1 has a second communication hole 51 (see FIG. 4) with a total length h ₀ of 3.0 mm, an opening diameter d ₁ on the inflow opening 51a side of 4.4 mm, and an opening diameter d ₂ on the outflow opening 51ab side of 2.5 mm. Here, the upper part 52a (see FIG. 4) of the inner wall surface 52 of the second communication hole 51 has a length h ₁ in the thickness direction of the second jig 2 from the inflow opening 51a of 1.5 mm, and has a tapered shape with an inclination angle width φ of 60°. On the other hand, the remaining lower part 52b (see FIG. 4) has a straight shape extending to the outflow opening 51ab with an opening diameter of 2.5 mm.

The water injection section 3 (see FIG. 1) of the deburring device of the first embodiment injects water at an injection pressure of 30 MPa from the tip 31 while rotating in the direction of the arrow in FIG. 1 at a rotational speed of 800 to 1000 rpm with an angle width of θ = 20° in FIG. 1.

Example 2
The deburring device of Example 2 is a specific example of the deburring device 10 of Fig. 1 equipped with the second jig 2 of Fig. 2. The first jig 1 (see Figs. 1 to 3) and the water injection unit 3 (see Fig. 1) in the deburring device of Example 2 are the same as those in Example 1, and only the second jig 2 is different from those in Example 1.

The second jig 2 (see FIG. 2) of the deburring device of Example 2 is a stainless steel plate-shaped member having a flat pressing surface 2a. The second jig 2 of the deburring device 10 of Example 2 is formed with a straight second communication hole 21 (see FIG. 2) having a total length of 3.0 mm that connects an inflow opening 21a having an opening diameter of 2.5 mm and an outflow opening 21b having an opening diameter of 2.5 mm.

(Comparative Example 1)
The deburring device of Comparative Example 1 has the same configuration as the deburring devices of Examples 1 and 2, except that the second jig is not present. That is, the deburring device of Comparative Example 1 has the same first jig 1 (see FIGS. 1 to 3) and water spray unit 3 (see FIG. 1) as Examples 1 and 2, but does not have a second jig. In the deburring device of Comparative Example 1, when removing peripheral burrs X and hole burrs Y, the water sprayed from the water spray unit 3 is directly received by the resin molded product from which the burrs are to be removed.

[Test 1]
The following Test 1 was carried out using the deburring devices of Example 1, Example 2 and Comparative Example 1. The resin molded product 4 shown in Figures 1 to 3, which has a through hole 40 with a diameter of about 2.5 mm, was used as the resin molded product from which burrs were to be removed, and peripheral burrs X (see Figure 1) and hole burrs Y (see Figures 2 and 3) were removed from the outer periphery of this resin molded product 4. In removing peripheral burrs X, the amount of protrusion of the portion of the outer periphery of the resin molded product 4 that was not covered by the second jig of each Example and protruded slightly was about 0.3 mm, which is an extremely small amount.

Specifically, first, the distance L (see FIG. 1) between the tip 31 of the water injection unit 3 and the resin molded product 4 from which burrs are to be removed was set to 15 mm, and peripheral burrs X were removed from the outer peripheral surface 4c (see FIG. 1), which is the molding surface. Note that the water injection range D (see FIG. 1) in a plane perpendicular to the injection direction at a distance L = 15 mm from the tip 31 is 6.5 mm because the angular width θ of the water injection from the water injection unit 3 is 20°.

Next, the distance L (see Figure 1) between the tip 31 of the water injection unit 3 and the resin molded product 4 from which the burrs were to be removed was set to 10 mm, and hole burrs Y were removed from the inner wall surface 4d (see Figures 2 and 3) of the through hole 40, which is the molding surface. Note that the water injection range D (see Figure 1) in a plane perpendicular to the injection direction at a distance L = 10 mm from the tip 31 is 4.7 mm because the angular width θ of the water injection from the water injection unit 3 is 20°.

The removal of such peripheral burrs X and hole burrs Y was carried out by feeding multiple resin molded products 4 one by one in order to a position where they would receive water spray from the water spray unit 3. The moving speed of the resin molded products 4 fed in this way was 3 m/min. The time required to remove hole burrs from one resin molded product 4 was 0.1 seconds.

In this test 1, the reason for changing the distance L (see FIG. 1) between the tip 31 of the water injection unit 3 and the resin molded product 4 from which burrs are to be removed when removing peripheral burrs X and when removing hole burrs Y is as follows. In general, the size of the water droplet particles that are sprayed from the tip 31 of the water injection unit 3 and collide with the burrs becomes smaller as the distance L becomes shorter. When removing hole burrs Y, a distance L of about 10 mm is sufficient, but when removing peripheral burrs X, the trajectory of the tip 31 of the water injection unit 3 is more complex than when removing hole burrs, making it difficult to align it with the resin molded product 4. For these reasons, the water droplet particles are too small at this distance L, and burrs may be left behind. Therefore, when removing peripheral burrs X, a distance L (see FIG. 1) of 15 to 20 mm is optimal. On the other hand, when removing hole burrs Y, if the distance L (see FIG. 1) is 15 to 20 mm, depending on the size of the opening into which the injected water flows (for example, the inlet opening in the second communication hole of the second jig), a large amount of water will miss the opening and not flow into the through hole 40 of the resin molded product 4.

After performing Test 1 for each of the deburring devices of Example 1, Example 2, and Comparative Example 1, the presence or absence of damage to the resin molded product 4 due to the water injection was checked. In addition, with regard to the hole burrs Y (see Figures 2 and 3), 10 burrs Y were randomly selected from those remaining on the inner wall surface 4d of the through hole 40 of the resin molded product 4 after Test 1, and the arithmetic mean value of their heights was calculated.

[Results of Test 1]
The evaluation results of Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1 below, together with the characteristics of these Examples and Comparative Examples.

In Table 1, comparing Comparative Example 1, in which the second jig is not present, with Examples 1 and 2, in which the second jigs 5 and 2 are present, the resin molded product 4 was damaged in Comparative Example 1, whereas no damage was observed in the resin molded product 4 in Examples 1 and 2. This shows that by covering the resin molded product 4 with the second jigs 5 and 2, damage to the resin molded product 4 by the water sprayed from the water spray unit 3 is avoided.

In Table 1, comparing Example 1, in which the inflow opening 51a side of the second communication hole 51 is tapered, with Example 2, in which the entire second communication hole 21 is straight, the average height of the remaining hole burrs Y is lower in Example 1 than in Example 2. This shows that by increasing the opening area of the inflow opening side of the second communication hole (more precisely, making it relatively larger than the outflow opening side), it becomes easier for most of the sprayed water to flow into the second communication hole, improving the efficiency of deburring. In addition, in Comparative Example 1, the sprayed water damaged the vicinity of the through hole 40 of the resin molded product 4, so the average height of the remaining hole burrs Y could not be obtained.

Example 3
The deburring device of Example 3 is a specific example of a deburring device in which the second jig 5 (see Figures 3 and 4) in Example 1 is replaced with the second jig 6 in Figure 5, and the first jig 1 and the water injection unit 3 are the same as those in Example 1.

The second jig 6 (see FIG. 5) of Example 3 is a stainless steel plate-like member having a flat pressing surface, similar to Example 1. The second jig 6 of Example 3 has a second communication hole 61 (see FIG. 4) that is curved with a curvature R of 3.5 mm over the entire inner wall surface 62 and narrows from the inlet opening 61a side to the outlet opening 61b side. The total length _h0 of the second communication hole 61 in Example 3 is 3 mm, similar to Example 1, and the opening diameter of the outlet opening 61b is also the same as Example 1.

Example 4
The deburring device of Example 4 is a specific example of a deburring device in which the second jig 5 (see Figures 3 and 4) in Example 1 is replaced with the second jig 7 in Figure 6, and the first jig 1 and the water injection section 3 are the same as those in Example 1.

The second jig 7 (see FIG. 6) of Example 4 is also a stainless steel plate-like member having a flat pressing surface, similar to Example 1. The second jig 7 of Example 4 is formed with a second communication hole 71 having an inner wall surface 72 having a shape combining the tapered shape of Example 1 (see FIG. 4) and the curved shape of Example 3 (see FIG. 5). Specifically, in the second communication hole 71 of Example 4, an upper portion 72a having a length _h1 in the thickness direction from the inflow opening 71a of 2 mm has a tapered shape with an inclination angle width φ=60°, and the remaining lower portion 72b on the outflow opening 71b side has a curved shape with a curvature R=3.5 mm.

Example 5
The deburring device of Example 5 is a specific example of a deburring device in which the second jig 5 (see FIGS. 3 and 4) in Example 1 is replaced with another second jig 5 (see FIGS. 3 and 4) that is different in the opening diameter _d1 on the inlet opening 51a side and the length _h1 of the upper portion 52a (see FIG. 4). Except for these dimensional differences, Example 5 is the same as Example 1, and the first jig 1, water injection unit 3, etc. are also the same as Example 1.

Therefore, the second jig 5 (see FIG. 6) of Example 5 is also a stainless steel plate-like member having a flat pressing surface, similar to Example 1, and has a second communication hole 51 (see FIG. 4) with a total length h ₀ of 3.0 mm and an opening diameter d ₂ of 2.5 mm on the outflow opening 51ab side. The upper portion 52a of the inner wall surface 52 of the second communication hole 51 has a tapered shape with an inclination angle width φ of 60°, similar to Example 1. However, in Example 5, the opening diameter d ₁ on the inflow opening 51a side is 4.8 mm, and the upper portion 52a (see FIG. 4) of the inner wall surface 52 of the second communication hole 51 has a length h ₁ in the thickness direction of the second jig 2 from the inflow opening 51a is 2.0 mm, and these are the only differences from Example 1.

[Test 2]
Test 2 was conducted using the deburring devices of Examples 3 to 5 and the above-mentioned Example 1. Test 2 was exactly the same as Test 1, except that the distance L (see FIG. 1) between the tip 31 of the water injection part 3 and the resin molded product 4 from which the burrs were to be removed was maintained at 15 mm in both the removal of peripheral burrs X (see FIG. 1) and the removal of hole burrs Y (see FIGS. 2 and 3).

After performing Test 2 for each of the deburring devices of Examples 1 and 3 to 5, it was checked whether the hole burrs Y had been sufficiently removed so that the resin molded product 4 could be judged to be an acceptable product.

[Results of Test 2]
After the test 2, in all of the examples 1, 3 to 5, no damage was observed on the resin molded product 4, and the hole burrs Y were sufficiently removed. From this, it can be seen that even if the distance L between the tip 31 of the water injection part 3 and the resin molded product 4 to be deburred is maintained at the optimal distance (about 15 mm) for removing the peripheral burrs X (see FIG. 1), the hole burrs Y can be sufficiently removed if the opening area of the inlet opening side of the second communication hole is large. This is considered to be because the injected water sufficiently flowed in from the wide inlet opening in each example. In this case, since it is not necessary to change the distance L between the tip 31 of the water injection part 3 and the resin molded product 4 to be deburred between the process of removing the peripheral burrs X and the process of removing the hole burrs Y, the efficiency of the deburring work process is improved. Specifically, it is possible to shorten the work time by about one second per resin molded product 4 to be deburred.

This concludes the explanation of this embodiment.

The above explanation has focused on removing burrs from resin molded products, but the present invention may also be applied to removing burrs from products other than resin molded products.

The present invention is useful for removing burrs from resin molded products while minimizing damage to the resin molded products caused by water spraying.

1: first jig,
1a: placement surface,
2: second jig;
2a: pressing surface,
3: Water injection section,
4: Resin molded product,
4a: upper surface,
4b: bottom surface,
4c: outer circumferential surface,
4d: inner wall surface,
5: second jig,
5a: pressing surface,
6: second jig,
7: second jig,
10: Deburring device,
11: first communication hole,
20: Deburring device,
21: second communication hole,
31: tip portion,
40: through hole,
41: main body,
41a: opening,
42: sealing portion,
51: second communication hole,
51a: inflow opening;
51b: outflow opening;
52: inner wall surface,
52a: upper part,
52b: lower part,
61: second communication hole,
61a: inflow opening;
61b: outflow opening;
71: second communication hole,
71a: inflow opening;
71b: outflow opening;
72: inner wall surface,
72a: upper part,
72b: lower part,
X: Outer burr,
Y: Hole burr.

Claims (4)

A water jet type deburring device for removing burrs from a resin molded product having a molding surface from which burrs protrude, the device comprising:
a first jig having a flat placement surface, on which the resin molded product is placed with a lower surface of the resin molded product connected to the molding surface in contact with the placement surface;
a second jig made of metal having a flat pressing surface, sandwiching the resin molded product with the molding surface exposed between the pressing surface and the placement surface of the first jig, and covering an upper surface of the resin molded product connected to the molding surface on the opposite side to the lower surface up to the vicinity of the molding surface;
a water injection unit that injects water from the second jig side toward the burr on the molding surface ,
The resin molded product has a through hole molded therein, the through hole having an inner wall surface as the molding surface, and the burr is a hole burr protruding from the inner wall surface of the through hole,
the first jig has a first communication hole formed therein that communicates with the through hole in a state in which the resin molded product is sandwiched between the first jig and the second jig,
The second jig is a deburring device in which a second communication hole is formed that communicates with the through hole while the resin molded product is sandwiched between the second jig and the first jig, the second communication hole having an inflow opening through which water sprayed from the water injection section flows in, and an outflow opening that is connected to an opening of the through hole on the second jig side and through which the water that flows in from the inflow opening flows out into the through hole . The deburring device according to claim 1 , wherein the second jig has a second communication hole in which the inlet opening has an opening area larger than that of the outlet opening as the second communication hole. The second jig is a deburring device as described in claim 2, wherein the second jig has as the second communicating hole a second communicating hole in which at least a portion of the inner wall surface narrows while inclining in a tapered shape from the inlet opening side toward the outlet opening side. The deburring device according to claim 2 or 3, wherein the second jig has as the second communicating hole a second communicating hole in which at least a portion of the inner wall surface curves and narrows from the inlet opening side toward the outlet opening side.

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