JP2009262233A - Spraying nozzle for coating lubricant onto die for forging - Google Patents

Abstract

An object of the present invention is to apply a lubricant to a forging die in the form of a liquid, and at the same time to spray and apply it in the form of a mist. An ejection nozzle for stably applying an amount of lubricant is provided.
In a jet nozzle 1 for lubricant to a forging die, a straight nozzle 3 for jetting a lubricant containing graphite in a liquid state is arranged at the center of a nozzle surface 2 of the jet nozzle 1, and this straight The upper die of the die surface of the forging die, in which a mist nozzle 4 or a mist nozzle tip for spraying a plurality of lubricants in the form of mist around the nozzle 3 is dispersed to form an integral nozzle surface 2. An ejection nozzle 1 for applying a lubricant for applying a graphite lubricant to a mold surface and a lower mold surface.
[Selection] Figure 1

Description

  The present invention relates to an apparatus for applying a lubricant to a die for forging, and more particularly to an injection nozzle for applying lubricant by spraying in a mist form in addition to application by liquid injection of graphite lubricant, and further molding Contour surface of the molding shape of a forging die used when manufacturing a mechanical member having a complicated shape with a diameter ratio of the largest portion and the smallest portion of the outer diameter in the shape of about 1.1 to 4.0 by forging The present invention relates to a spray nozzle for lubricant application in which a lubricant that can be sprayed and applied uniformly without slipping, for example, a graphite lubricant is sprayed in a mist form.

  In an apparatus for applying a lubricant for lubrication to a mold for forging, it is desirable that the lubricant adheres uniformly to the surface of the mold with a dry film when the lubricant is sprayed onto the mold. That is, conventionally, when mechanical parts are formed by forging, forging is performed by spraying a graphite lubricant on the contour surface of the molding shape of a forging die. In this case, it is desired that the graphite lubricant obtained by spraying onto the mold as described above becomes a uniform and dry film. In order to make it adhere uniformly, it is optimal to make the graphite lubricant mist when adhering to the surface of the mold.

  By the way, the rough forming process of the CVJ outer ring of the automobile member is forging by severe forward extrusion with a large area reduction rate. By the way, the shape of the workpiece processed in the preliminary process for the CVJ outer ring can be roughly classified into a cup part and a stem part. The shape of this CVJ outer ring is the cup part in front of the forging direction in the height direction. And a stem part at the end, and the length in the height direction is large. For this reason, if the lubricant is sprayed in the form of a mist on the workpiece having a large length in the height direction, the lubricant does not reach the leading edge of the stem sufficiently. Therefore, instead of using a mist shape, a method of spraying the lubricant in the liquid state while aiming at the tip of the stem results in a straight liquid-like spray, which is applied to the inner surface of the mold hole in the cup portion in front of the stem portion. Does not adhere to the lubricant. For this reason, there is a problem that the lubricant does not adhere to the wide cup portion only by spraying straight liquid.

  Therefore, if the lubricant discharge amount is increased in order to attach the lubricant to the wide cup part in addition to the most advanced part of the stem, the liquid lubricant accumulates on the contour surface of the molded part of the cup part or the stem part. Therefore, there is a problem that the liquid lubricant accumulated during forging is gasified and causes the workpiece, which is the shape of the CVJ outer ring, to jump.

  By the way, a nozzle for forging press has been proposed in which a nozzle for injecting lubricant is rotated on the contour surface of the molding shape of a forging press mold, and the rotation angle can be set continuously. (For example, refer to Patent Document 1). However, since this is a nozzle that can rotate around its axis and that can advance and retreat, its rotation can be controlled via any drive means of a servo motor, inverter motor or actuator. There is a problem that the mechanism is complicated and expensive because it is different from the one applied to the shape composed of the cup portion and stem portion of the work for the CVJ outer ring.

  Furthermore, as a conventional technique, in the forging of aluminum alloy, a spraying nozzle for spraying lubricant in a sprayed state is arranged by spraying a compressed air discharge port and a lubricant discharge port concentrically. And lubricate undried parts, uncoated parts, and lubricant reservoirs due to deviations between the range of lubricant applied to the contour surface of the molding shape of the mold and the range of sprayed compressed air for drying. There has been proposed a nozzle for applying a lubricant that prevents a malfunction (see, for example, Patent Document 2). However, this is a concentric circle between the lubricant outlet and the drying air outlet, and the drying air is not misaligned from the applied lubricant. It was not intended to apply evenly on the surface of the mold cavity without any deviation.

Japanese Patent Laid-Open No. 2006-68753 JP 2002-321033 A

  The problem to be solved by the present invention is that a lubricant such as a graphite lubricant can be sprayed and applied to a forging die at the same time as it is sprayed and applied in the form of a mist, and on the front side of the die From the contour surface portion of the molded shape to the contour surface portion of the molded shape on the deep tip side, that is, from the contour surface of the cup portion shape on the near side of the mold of the CVJ outer ring to the contour shape of the stem portion on the distal side. An object of the present invention is to provide a jet nozzle for applying a lubricant to a forging die capable of spraying and applying a lubricant uniformly to the surface.

  The means of the present invention for solving the above-described problems is that, in the invention of claim 1, in the jet nozzle of the lubricant to the forging die, the lubricant is jetted out in the center of the nozzle surface of the jet nozzle. A straight nozzle is arranged, and a plurality of mist nozzles for spraying a lubricant in the form of a mist are arranged around the straight nozzle to form an integral nozzle. It is an ejection nozzle.

  The invention according to claim 2 is characterized in that the plurality of mist nozzles are annularly distributed around the straight nozzle and are used for applying lubricant to the forging die according to the means of claim 1. It is an ejection nozzle.

  In the invention of claim 3, the plurality of mist nozzles arranged in an annular manner around the straight nozzle is formed on the die center line of the forging die having the cup portion and the stem portion to be sprayed. 3. A jet nozzle for applying a lubricant to a forging die according to claim 2, comprising a plurality of inclined mist nozzle tips.

  Further, in the above means, in the invention of claim 4, the arrangement of the mist nozzle tips on the nozzle surface of the jet nozzle for applying the lubricant is such that the forging die in forward extrusion forging, for example, the cup portion and stem portion of the CVJ outer ring. This is a spray nozzle for applying a lubricant in which the inclination with respect to the mold center line for forging satisfies a certain angle.

In a fourth aspect of the invention, the plurality of mist nozzle tips that are annularly distributed around the straight nozzle and inclined with respect to the mold center line are the chip center line with respect to the mold center line of the forging mold. the tilt angle and theta _1, and the angle between the straight line between the centers and the forging die of the cup inner diameter upper end of the spray port of the mist nozzle tip against the die center line of forged mold theta when the _2, theta ₁ is 0 ° <θ ₁ <ejection nozzle of the lubricant for application to forging die means of claim 3, characterized by satisfying the theta _2.

  According to a fifth aspect of the present invention, in the mist nozzle tip, the spray port portion is enlarged in a trumpet shape, and the lubricant is applied to the forging die according to any one of the first to fourth aspects. This is a jet nozzle for use.

  In the present invention, as in the above-described means, the spray nozzle for application for spraying and applying a lubricant, for example, a graphite lubricant, to the forward extrusion forging die is a center in which the lubricant is sprayed in a liquid form. A single nozzle and a plurality of mist nozzles or a mist nozzle tip for spraying lubricant in the form of a mist around the nozzle, and an integral nozzle for spraying lubricant. The lubricant can be injected without being dispersed to the foremost die hole of the forging die of the stem portion having a long depth in the height direction, while 3 to 8 mist nozzles or mist nozzle tips are included therein. Since a plurality of mist nozzles or mist nozzle tips are arranged in an annular shape around the straight nozzle, the outer diameter of the wide cup part is moistened. Agent can be sprayed and enlarged dispersed mist. As a result, a spray nozzle for applying a lubricant is sprayed into a mold hole of a forging die for a product having a wide expanded portion such as CVJ and a long depth stem regardless of its size. Thus, a uniform dry lubricant film can be formed at a necessary location. Further, the mist nozzle tip is inclined with respect to a direction parallel to the circumferential direction with respect to the center line of the mold hole of the forging die, and the inclination angle of the mist nozzle tip is larger than the outer diameter portion of the cup portion such as CVJ. Forging molds for CVJ outer rings with a single jet nozzle for lubricant application, even if the outer diameter of the cup part such as CVJ outer rings is variously adjusted by adjusting to the height. A uniform lubricant film can be sprayed to the part of the mold hole. In these, the straight nozzle and the mist nozzle or the mist nozzle tip are integrated and directed to the mold hole of the forging die as a jet nozzle for applying lubricant, so that mechanical modification of the forging device is absolutely necessary. Therefore, it is possible to improve the spraying of the graphite lubricant. Furthermore, since the jet port of this mist nozzle tip is formed in a trumpet shape and there are no corners at the jet port portion, the mist can be efficiently diffused without being obstructed by the jet port portion. As a result, a forged product having very few defects compared to a conventional forged product is obtained, and the formability in forging can be improved.

In the integrated nozzle for applying lubricant according to the present invention, (a) is a front view seen from the nozzle surface side, and (b) is a side view. FIG. 4 is an integrated nozzle for applying lubricant according to another embodiment of the present invention, wherein (a) is a front view seen from the nozzle surface side, and (b) is seen in the direction of arrows AA in the front view. FIG. It is a figure which shows the inclination | tilt angle of a mist nozzle chip when orienting the mist nozzle chip | tip of the injection nozzle for lubricant application to the shape surface of the cup part of the die hole of the lower die for forging of a CVJ outer ring | wheel. It is sectional drawing which shows a part of forging process by the upper metal mold | die and lower metal mold | die for forging metal mold | die of a CVJ outer ring | wheel with (a) and (b).

  Embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows a jet nozzle 1 for applying a lubricant according to an embodiment of the invention according to claim 1, and is a contour surface of the shape of a cup portion 10a and a stem portion 10b of a CVJ outer ring 10 shown in FIG. 4 (b). This is an ejection nozzle for applying a graphite lubricant to a forging die 7 having

  As shown in FIG. 1, the spray nozzle 1 for applying lubricant includes a straight nozzle 3 for spraying a graphite lubricant in a liquid state and a mist nozzle 4 for spraying a graphite lubricant in a mist form as an integrated nozzle surface 2. Have. As shown in the front view of FIG. 1 (a) and the side view of FIG. 1 (b), the ejection nozzle 1 is a φ40 mm cylinder, and the length of the cylinder is 35 mm. For example, a wrench hook 1a having a width of 32 mm in the vertical direction and a wrench hook 1b having a width of 36 mm in the horizontal direction are provided on the side portion on the distal end side of the cylindrical body of the ejection nozzle 1. Further, as shown in the front view of FIG. 1A, one straight nozzle 3 is formed at the center of the nozzle surface 2. Around the straight nozzle 3, for example, six mist nozzles 4 are arranged at equal intervals on a circle of φ19 mm. In this case, as shown in the side view of FIG. 1B, the outlet of the straight nozzle 3 is formed in a straight line, but the outlet of the mist nozzle 4 is enlarged in diameter on the front side to form a trumpet-shaped spray port portion. 4b. Accordingly, the graphite lubricant to be ejected under pressure is supplied to the nozzle interior 5 from the graphite lubricant supply port 6 of the ejection nozzle 1, and is distributed to the straight nozzle 3 and the mist nozzle 4 in the nozzle interior 5. In 3, the liquid is jetted straightly. On the other hand, the mist nozzle 4 is expanded at the outlet trumpet-shaped spray port 4b and sprayed in a mist shape.

  In the embodiment of the means of claim 2 of the present invention, the straight nozzle of the ejection nozzle 1 is one straight nozzle present at the center of the nozzle surface 2 as seen in the front view of FIG. The plurality of mist nozzles 4 are arranged in a ring-like manner around the straight nozzle 3 and are composed of the six mist nozzles 4 as described above. In the jet nozzle 1 according to the embodiment of the means of claim 1 or claim 2, the direction of each of the plurality of mist nozzles 4 distributed on the nozzle surface 2 in an annular manner is relative to the nozzle surface 2. It is in a certain vertical direction. Accordingly, in the ejection nozzles 1 of these embodiments, the graphite lubricant sprayed from each mist nozzle 4 is ejected straightly in the straight nozzle 3 while remaining in a liquid state. On the other hand, the mist nozzle 4 is expanded at the outlet trumpet-shaped spray port 4b and sprayed in a mist shape, and the spray direction is a constant direction.

  On the other hand, in the embodiment of the means of claim 3 of the present invention, the spray nozzle 1 for applying lubricant is a straight nozzle that linearly jets the graphite lubricant as shown in FIG. 3 and a mist nozzle tip 4a for spraying graphite lubricant in the form of a mist on the nozzle surface 2 as an integral type. The spray nozzle 1 for applying lubricant is shown in the front view of FIG. 2A and the side view of FIG. 2B in the same manner as the spray nozzle 1 of the first and second embodiments. Thus, for example, it consists of a cylinder of φ40 mm, and the length of the cylinder is 35 mm. For example, a wrench hook 1a having a width of 32 mm in the vertical direction and a wrench hook 1b having a width of 36 mm in the vertical direction are provided on the side of the cylindrical body of the jet nozzle 1 for applying lubricant. .

  Further, as shown in the front view of FIG. 2A, one straight nozzle 3 is formed at the center of the nozzle surface 2. Around the straight nozzle 3, for example, six mist nozzle tips 4a are arranged at equal intervals on a circle of φ19 mm. In this case, the straight nozzle 3 is linearly formed in the center of the ejection nozzle 1 from the nozzle interior 5 to the exit portion of the nozzle surface 2. On the other hand, the outlets of the six mist nozzle tips 4a that are annularly arranged around the straight nozzle 3 in an inclined manner in parallel with the circumferential direction have a front surface expanded in diameter to form a spray port portion 4b. Accordingly, as shown in FIG. 2B, the graphite lubricant that is jetted under pressure is supplied to the nozzle interior 5 from the graphite lubricant supply port 6 of the ejection nozzle 1, and straight in the nozzle interior 5. It is distributed to the nozzle 3 and the mist nozzle tip 4a around it, and the straight nozzle 3 is jetted straight in a liquid state. On the other hand, in the mist nozzle tip 4a, the graphite lubricant is spread and sprayed in a mist form at the spray port 4b of the mist nozzle tip 4a.

By the way, when the cup part 10a and the stem part 10b of the CVJ outer ring 10 are integrally formed by forward extrusion by the jet nozzle 1 of the present invention, as shown in FIG. 3, forging for forming the cup face 10a and the stem face 10b. The inclination angle of the chip center line 12 with respect to the mold center line 11 of the mold 7 for use is θ _1, and the mold of the forging mold 7 is formed from the peripheral wall of the mist nozzle chip 4 a with respect to the mold center line 11 for forging. straight to the inner diameter inlet corner portions of the contoured surface of the shape of the cup portion 10a of the surface 8, i.e. the center and the inclination angle of the straight line 14 between the cup inner diameter upper end 13 of the spray nozzle portions 4b of the mist nozzle tip 4a and theta ₂ is In this case, θ ₁ is in a range satisfying 0 ° <θ ₁ <θ ₂ , that is, in a range inclined in parallel to the circumferential direction. Then, after adjusting the angle of θ ₂ to be constant according to the shape and size of the cup portion 10a and stem portion 10b of the CVJ outer ring 10 to be formed, the CVJ outer ring 10 having the same shape is formed. In the meantime, the mist nozzle tip 4a is fixed inside the ejection nozzle 1 with an adhesive so that the angle is kept constant. This adhesive is made of a synthetic resin that can be easily released when the shape and size of the cup 10a and stem 10b of the CVJ outer ring 10 to be molded are changed.

  FIG. 4 shows an example of a one-step forging method in a plurality of forging dies 7 in a forging process including a plurality of steps for forming the CVJ outer ring 10 that is an automobile part by forging. In this case, in order to apply the graphite lubricant to the forging die 7, the upper die surface of the forging die 7 for the CVJ outer ring 10 shown in FIG. A graphite lubricant was applied to 8a and lower mold surface 8b. Next, the pre-formed steel material 9 is heated to the hot forging temperature and placed on the lower mold surface 8b of the forging die 7, and the steel material 9 is hot-extruded forward by the upper mold surface 8a. Molded by forging. Further, a graphite lubricant is applied to each of the upper mold surface 8c and the lower mold surface 8d formed in the cup portion 10a and the stem portion 10b shown in FIG. 4B, and the step (a) in FIG. The steel material 9 formed in (1) was placed on the mold 7d, and formed into the CVJ outer ring 10 by hot forging by forward extrusion through the upper mold surface 8c. As a result of this forming, the forged CVJ outer ring 10 did not have any defects such as forged rods. Accordingly, the graphite lubricant is aimed at the entire surface of the mold surface 8 from the most distal end portion of the stem portion 10b having a long length in the height direction of the CVJ outer ring 10 to the outer diameter portion having an enlarged width of the cup portion 10a. It was judged that it was applied almost uniformly.

DESCRIPTION OF SYMBOLS 1 Jet nozzle for lubricant application 1a Wrench spanner with width 32mm 1b Wrench spanner with width 36mm 2 Nozzle surface 3 Straight nozzle 4 Mist nozzle 4a Mist nozzle tip 4b Spray port part 5 Nozzle inside 6 Lubricant supply port 7 Forging die 7a Upper mold 7b Lower mold 7c Upper mold 7d Lower mold 8 Mold surface 8a Upper mold surface 8b Lower mold surface 8c Upper mold surface 8d Lower mold surface 9 Steel material 10 CVJ outer ring 10a Cup part 10b Stem part 11 Mold center line 12 Chip center line 13 Upper end of cup part inner diameter 14 Straight line

Claims (5)

  A plurality of spray nozzles for spraying lubricant into a forging die, in which a straight nozzle for spraying the lubricant in a liquid state is arranged at the center of the nozzle surface of the spray nozzle, and the lubricant is sprayed around the straight nozzle in the form of a mist An ejection nozzle for applying a lubricant to a forging die, wherein a single nozzle is formed by arranging a single mist nozzle.   2. The jet nozzle for applying a lubricant to a forging die according to claim 1, wherein the plurality of mist nozzles are annularly distributed around the straight nozzle.   A plurality of mist nozzles arranged in an annular manner around the straight nozzle are a plurality of mists inclined with respect to a mold center line of a forging die having a cup part and a stem part to be sprayed. 3. A jet nozzle for applying a lubricant to a forging die according to claim 2, comprising a nozzle tip. A plurality of mist nozzle tips distributed in a ring around the straight nozzle and inclined with respect to the mold center line has an inclination angle of the chip center line with respect to the mold center line of the forging mold θ ₁ When the angle between the center of the spray port of the mist nozzle tip relative to the mold center line of the forging mold and the straight line between the upper ends of the inner diameters of the cup parts of the forging mold is θ ₂ , θ ₁ 4. The jet nozzle for applying a lubricant to a forging die according to claim 3, wherein 0 satisfies <0 ° <θ ₁ <θ ₂ .   The spray nozzle for applying a lubricant to a forging die according to any one of claims 1 to 4, wherein the mist nozzle has a spray port portion expanding in a trumpet shape.

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