JP4828916B2 - V-shaped groove press molding method and molded product thereof - Google Patents

Description

  The present invention relates to a V-shaped groove press molding method, in particular, a cylindrical or cylindrical shape having a V-shaped groove on its circumferential surface without changing the amount (mass, ie, volume) of the raw material. The present invention relates to a cold forging V-shaped groove press molding method that can be molded and a molded product having a desired desired shape can be achieved by press working, and the molded product.

  Conventionally, automotive parts and the like are manufactured by cold forging, for example, by simultaneously processing multiple processes in a single press. However, in parts that require extremely high accuracy, a uniform load is applied to the entire slide. There are few parts that can be press-molded in such a state, and there are many cases where parts that are subjected to an unbalanced load on the mold are manufactured. There has been a demand for the development of a technique for pressing the mold while maintaining the level correctly even when an unbalanced load is applied.

  However, when pressing by cold forging, the slide will drop non-parallel to the lower die, and cold forging parts with extremely high precision will allow multiple processes to be performed simultaneously in one press. At present, it cannot be processed and pressed.

  On the other hand, when manufacturing parts that require high precision by hot forging, the cause based on the mold and its molded product when temperature changes from low temperature to high temperature and when temperature changes from high temperature to low temperature. As a result, high-precision parts could not be manufactured. That is, the mold expands and contracts in response to changes in temperature, an oxide film is generated on the press surface of the mold, and when the shape of the molded product is not uniform, heat shrinkage occurs between places where the material is large and where the material is small. It was not uniform and an unbalanced state occurred, making it difficult to manufacture high-precision parts.

  In the case where such a highly accurate part is required, it has been conventionally cut. However, in recent years, high-precision press molding methods having precise precision have been developed, and it has become possible to manufacture parts that have been processed by conventional cutting.

Multiple presses for controlling the tilt of the slide to prevent the slide that moves the upper die from moving up and down when a large load is applied. And a position sensor for each of a plurality of sliding pillars that slide a slide that moves the upper mold up and down, and drives and controls the plurality of electric motors based on position information of each position sensor, The present applicant has already proposed an electric press apparatus that performs movement control so that a slide for moving the mold up and down is always parallel to the lower mold (see Patent Documents 1 to 7). In Patent Document 7, when pressing a locally generated load portion, control is performed so that the pressing force is temporarily increased at the load portion in consideration of the occurrence of the load in advance. ing.
JP 2002-263900 A JP 2003-126998 A JP 2004-141902 A JP 2004-141942 A PCT / JP2004 / 009724 PCT / JP2004 / 012469 Japanese Patent Application No. 2004-261744

  In particular, when forming a columnar shape or cylindrical shape with a V-shaped groove on the circumferential surface from the raw material (hereinafter referred to as “cylindrical shape”) with high accuracy, When forming a groove, such as a V-shaped groove, the mass pushed and moved by the press flows in one direction of the extrusion, so that the mass is not flown to the entire V-shaped groove, making molding difficult. .

  In recent years when low-cost mass production is required, it is possible to manufacture high-precision products by cutting grooves such as V-shaped grooves on cylindrical shapes by cutting. In terms of cost, it is no longer a processing method that meets the needs of the times. Therefore, there is a strong demand for a press molding method that can form a cylindrical shape having a V-shaped groove on the circumferential surface with high accuracy and high speed, which has high product accuracy and is excellent in production.

  Depending on the shape, means of welding can be considered, but from the viewpoint of use, for example, it is not possible to obtain reliability unless it is integrally molded from the point of strength, etc. A molding method is strongly desired.

  The present invention has been made in view of the above points. The object of the present invention is to form a cylindrical shaped object having a V-shaped groove on the circumferential surface with high accuracy without changing the amount of the raw material. It is an object of the present invention to provide a cold forging press molding method that can achieve a molded product having a shape to be formed by a press, and the molded product.

Therefore, the V-shaped groove press molding method according to the present invention includes a flange portion in which a raw material is used as a raw material and a first hole is provided in the center portion, and a communication hole in a form continuous to the first hole at the lower end of the flange portion. And a cylindrical portion having a V-shaped groove on the circular outer peripheral surface, and a bottomed cylindrical portion having a second hole in a form continuous to the first hole at the tip of the cylindrical shape portion . In a V-shaped groove press molding method for molding a shape member by press working,
A first step of forming a flange portion and a cylindrical portion from a raw material as a raw material;
When the plurality of die segments are combined and closely assembled, the outer surface is formed of a tapered surface, and the diameter of the cylindrical portion is included therein. A cylindrical die having a segment die having an equivalent inner diameter and a groove die for forming a V-shaped groove, and a die closing wedge having a taper surface the same as the taper surface of the segment die formed therein; The circular outer peripheral surface of the cylindrical portion formed in the first step by the closing swaging process of the press that causes the material to flow into the gap formed by the V-shaped groove with the segment die when the segment die is engaged A second step of forming a V-shaped groove in
In forming the bottomed cylindrical part having the second hole at the tip of the cylindrical part, the bottomed cylindrical part in the future, which is excluded by the extrusion process for increasing the depth of the first hole, A third step of flowing a sufficient amount of material to form a cylindrical protrusion at the tip of the cylindrical portion, and then forming the second hole;
A feature is that a V-shaped groove is formed in the cylindrical portion by cold forging press working.

And as for the said flange part, a part of flange part forms the bank of one side of a V-shaped groove | channel.
Further, the segment die composed of the plurality of die segments has a frustum shape in its outer shape, and the inside of the segment die is formed by a mold closing wedge formed in the same tapered frustum shape as the outer shape of the segment die. The outer shape of the segment die is constrained by the mold closing wedge.

The number of V-shaped grooves formed on the circular outer peripheral surface of the cylindrical portion is either 1 or 2.

Then, as the material, iron containing steels, titanium alloys, cobalt alloys, beryllium alloys, copper alloys including bronze, any metal including aluminum alloy is used.

And the molded product in which the V-shaped groove is formed on the circular outer peripheral surface according to the present invention, the flange portion provided with the first hole in the central portion,
A cylindrical hole formed in the lower end of the flange portion with a communication hole in a form continuous with the first hole, and having one or two V-shaped grooves formed on the circular outer peripheral surface ;
A shape member having a bottomed cylindrical portion having a second hole in a form continuous to the first hole at the tip of the cylindrical shape portion is used as a raw material, and the mass (amount) of the raw material is not increased or decreased. Further, it is characterized in that a V-shaped groove is formed on a circular outer peripheral surface characterized by being formed by cold forging press working.

  Using a raw material as a raw material, without changing the amount of the raw material, a cylindrical shape having a V-shaped groove on the circumferential surface can be manufactured by cold forging press processing, and without being welded. As a result, a molded product requiring strength with a target shape can be met with high accuracy and high reliability, and can be manufactured without manufacturing a defective product. In addition, the final molded product can be produced with just a press, and a continuous production process can be constructed, improving the production efficiency.

  Moreover, when it has a part with a common shape, such as forming the cylindrical shape in the lower end of a flange part, the metal mold | die of the production can be used in common and production cost can be reduced.

  FIG. 1 to FIG. 9 are diagrams for explaining examples of forming a V-shaped groove press forming method according to the present invention, respectively, and the state of the formed product formed by cold is shown in cross section.

  Hereinafter, referring to the drawings, an embodiment manufacturing process for manufacturing a molded product having a desired shape shown in FIG. 9 will be described sequentially from FIG.

In FIG. 1, a material 1 having a diameter D and a thickness H ₀ (for example, a block having a diameter of 25 mm and a thickness of about 6 mm) is punched from a plate-shaped material in a blanking process.

During the first step from the state of FIG. 1 to the state of FIG. 2, a ring-shaped integrated die (lower die), a punch (upper die), and a knockout pin (lower die) for removing the molded product from the die. 2 from the flange portion 2 having the outer diameter D (same as the diameter D of the material 1 in FIG. 1), the outer diameter d (D> d) of the small diameter portion, and the upper end surface of the flange portion 2 of the shape shown in FIG. Forward extrusion molding (processing) is performed in which a cylindrical portion 3 having a length h ₁ (h ₁ > H ₀ ) and having the same outer diameter d as the small diameter outer diameter d of the flange portion 2 is formed. That is, the first molding is performed, and the material 1 having the diameter D and the thickness H ₀ becomes the molded product M1.

  In addition, the taper part formed in the flange part 2 is formed so that the mass to be moved later can easily flow, and is expected to become one bank of the V-shaped groove when the V-shaped groove is formed in the future. Of the shape to be made.

  In the first molding, the material volume of the material 1 shown in FIG. 1 is equal to the volume of the molded product M1 shown in FIG. Also in each molding process described below, the volume before and after the molding is the same, and the law of constant volume is always established even if the material flows.

During the second step from the state of FIG. 2 to the state of FIG. 3, a die (lower die), a punch (upper die), and a knockout pin (upper die) are used to form the inner diameter of the shape shown in FIG. depth d _i h _i hole 4 is provided by the rear extrusion of the second step from the flange portion 2 toward the cylindrical portion 3 (processing). In this second step, a mass corresponding to the volume of the hole 4 removed by the punch at this time moves to the cylindrical portion 3 and maintains the outer diameter d from the bottom surface of the cylindrical portion 3 to the upper end surface of the flange portion 2. Until the length h ₂ (h ₂ > h ₁ ) is reached, resulting in a molded product M2 shown in FIG.

  The molded product M2 shown in FIG. 3 is inverted upside down by the third step from the state of FIG. 3 to the state of FIG.

During the fourth step from the state of FIG. 4 to the state of FIG. 5, a segment die 50 composed of a plurality of evenly divided die segments 51 shown in FIG. 10 described in detail later, and a mandrel 53 (FIG. 11) The length from the upper end surface of the cylindrical portion 3 to the bottom surface of the flange portion 2 of the shape shown in FIG. 5 is set to h ₃ by the closing and swaging type with the upper punch 54 (FIG. 13), a knockout pin, etc. Groove ridge extrusion molding is performed while shortening to (h ₃ <h ₂ ), and groove ridges 5 and V-shaped grooves 6 are formed in the cylindrical portion 3. That is, a shape member having a flange portion 2 and a cylindrical portion in which a hole 4 is formed, that is, a cylindrical portion having one V-shaped groove 6 on the outer peripheral surface of the column portion 3, using the raw material 1 as a raw material. The molded product M3 shown in FIG. 5 is molded.

  The formation of the groove 5 and the V-shaped groove 6 at this time will be described in detail with reference to FIGS. 10 to 16, and the description here will be kept to this extent.

  In the fifth step from the state of FIG. 5 to the state of FIG. 6, the molded product M3 shown in FIG. 5 is inverted upside down and returned to the original posture shown in FIG.

During the sixth step from the state of FIG. 6 to the state of FIG. 7, a die (lower die), a punch, a knockout (upper die), and a knockout pin (lower die) are used to obtain the shape shown in FIG. , forward extruded to the hole 7 until the described internal diameter d _i at depth h _i hole 4 deep punch having an outer diameter d _i of _{h l (h l> h i} ) in FIG. 3 is formed.

At this time, the volume change of the hole 7 that is eliminated by the punch, that is, the mass (amount) corresponding to the depth change (= h ₁ −h _i ) at the inner diameter d _i is applied to the cylindrical portion 3 of the outer diameter d. Rather than simply extending, as a preparation for securing a mass (amount) sufficient to form a bottomed cylindrical portion 12 (see FIG. 9), which will be described later, and the next seventh step (from the state of FIG. 7 to FIG. 8). When the hole 9 is formed in the cylindrical portion 3 in the state of FIG. 9, the cylindrical protrusion 8 to be a material (mass) for forming the cylindrical shape in the future, that is, the bottomed cylindrical portion 12 (see FIG. 9). In order to be formed without tearing, the material is moved to the tip of the cylindrical portion 3 to form a cylindrical protrusion 8 having an outer diameter of d ₂ (d ₂ ≈d _i ) and a length of h ₄ . Six steps are performed. That is, a molded product M4 is obtained by the fourth molding.

During the seventh step from the state shown in FIG. 7 to the state shown in FIG. 8, the inner diameter d ₃ (d ₃ <d _{i) is formed at} the tip of the hole 7 shown in FIG. ), A forward extrusion process for forming a hole 9 having a depth h ₆ is performed. The tip of the hole 9 is formed deeper than the base position P of the cylindrical protrusion 8 (ΔP in FIG. 8). Accordingly, the thickness of the corner of the base portion of the cylindrical portion 3 marked with the circle A is sufficient to withstand the tensile force generated when the hole 9 is formed due to the meat gathering in the sixth step. In the seventh step, that is, in the fifth molding, even if a tensile force is applied to this portion, the cylindrical protrusion 8 is not broken from the cylindrical portion 3 and the hole 9 having the depth h ₆ is formed. (Patent applicants have filed a patent application as Japanese Patent Application No. 2005-37552 for what has been described in more detail regarding this part). At this time, the thickness from the tip of the hole 9 to the bottom surface of the cylindrical protrusion 8 is t ₁ (t ₁ <h ₄ ).

During the eighth step from the state of FIG. 8 to the state of FIG. 9, the punch diameter is set so that the depth h ₆ of the hole 9 with the inner diameter d ₃ is further deepened to a predetermined depth h ₇ (h ₇ > h ₆ ). carried forward extrusion against cylindrical projection 8 of the outer diameter d ₂ than at the d _3, the outer diameter d _2, the bottom thickness t ₂ at the inner diameter _{d 3 (t 2 <t 1} ), the predetermined dimensions of length h ₈ The bottomed cylindrical portion 12 having the following is formed. In other words, the desired shape of the molded product M6 is completed by the sixth molding.

  At this time, it goes without saying that the total volume of the molded product M6 shown in FIG. 9 is equivalent to the volume of the material 1 shown in FIG.

  Here, the fourth step of molding the molded product M3 shown in FIG. 5 will be described in detail with reference to FIGS.

  FIG. 10 is a conceptual plan view of the main part of the closed swaging type. The closed swaging type forms the groove 5 and the V-shaped groove 6 shown in FIG. Segment 51 having a groove shape on the inner surface, a segment die 50 in which the divided die segments 51 are assembled by closely combining the divided surfaces, and an outer peripheral surface of the segment die 50 And a mold closing wedge 52 that firmly covers the main part jig.

  The segment die 50 is composed of a plurality of divided dies that are equally divided into eight in FIG. 10, that is, die segments 51, and the divided surfaces of the eight divided die segments 51 are in close contact with each other. It has a configuration. By combining, ie, assembling, the eight die segments 51, a hole is formed in the inside, and the groove 5 of the molded product M3 shown in FIG. It has the structure which comprises the groove type | mold for forming in the individual cylinder part 3. FIG.

  The outer shape of the assembled eight die segments 51 has a tapered shape and has a truncated cone shape (in the case of illustration) such that the upper portion has a small diameter when closely attached.

  On the other hand, the mold closing wedge 52 has the same inside shape as the taper shape of the outer peripheral surface of the eight die segments 51 so that the divided surfaces of the eight die segments 51 are gathered so as to more firmly adhere to each other. It has a shape, that is, the shape of the truncated cone, and has a structure that fits closely with the truncated cone shape of the segment die 50, and has a groove 5 and a V-shaped groove 6 in the cylindrical portion 3 of the molded product M3. It has a function to prevent the die segment 51 from being separated and expanded when it is formed.

  In addition, although the outer peripheral surface in each die segment 51 is shown as what is circular arc shape in FIG. 10, the shape connected with a straight line like illustration dotted line may be sufficient. Needless to say, in this case, the inner surface of the mold closing wedge 52 has a shape corresponding to the dotted line.

  The mandrel 53 and the upper punch 54 of the jig shown in FIGS. 11 to 16 will be described here. The mandrel 53 enters the hole 4 of the molded product M2 inverted in the third step, and The mold axis of the mandrel 53 and the axis of the molded product M2 are made to coincide with each other, and deformation of the hole 4 at the time of swaging is prevented. The upper punch 54 is formed so that its outer diameter d (equal to d shown in FIG. 5) is slightly thinner than the inner diameter of the eight die segments 51 assembled so as to be in close contact with each other. The cylindrical portion 3 of the molded product M2 inserted into the hole formed by the eight die segments 51 is pressed downward as shown by the solid line in FIG.

  In the third step from the state shown in FIG. 4 to the state shown in FIG. 5, a segment die 50 for forming the groove 5 and the V-shaped groove 6 as shown in FIG. The operation of the closing wedge 52, together with the mandrel 53, the upper punch 54, and the knockout pin jig, is shown in the state of the mold opening in FIG. 11 and before the molded product M2 is inserted, and the mold opening in FIG. FIG. 13 is a diagram for explaining the situation when inserted so as to be covered, FIG. 13 is a diagram for explaining the structure of the mold closing and forming space (gap) generation, FIG. 14 is a diagram for explaining the flow of material into the molding space by punch press, and FIG. Next, referring to FIGS. 11 to 16, the movement direction of each jig when the mold is opened and the removal explanatory view of the molded product M <b> 3 in FIG. 16 will be described.

  (1) Each segment die 51 of the segment die 50 is placed in the horizontal plane shown in the drawing so as to approach or separate from its axis Z (see FIG. 11) by means not shown, for example, a drive mechanism such as a hydraulic cylinder. It is configured to be freely movable in the vertical direction of the paper axis Z, and when the die segment 51 approaches the axis Z, the divided surface of each die segment 51 is brought into close contact with the divided surface of the adjacent die segment 51. .

  (2) The outer diameter of the segment die 50 formed in close contact with each die segment 51 is a perfect circular taper in the case of the solid line shape shown in FIG. 10, that is, forms a circular frustum.

  (3) When the die segment 51 moves toward or away from the axis Z, the mold closing wedge 52 retreats above the die segment 51.

  (4) When each die segment 51 approaches the axis Z and enters the state of (3) above, the mold closing wedge 52 that has retreated upward is lowered, and eight die segments 51 are assembled. The segment die 50 formed in close contact with the outer taper surface, that is, the circular frustum inclined surface, and the inner taper surface provided in the mold closing wedge 52, that is, provided in the mold closing wedge 52 in advance. The circular frustum inclined surface is in contact with the inclined surface having the same shape. The mold closing wedge 52 is also moved up and down by a drive mechanism such as a hydraulic cylinder.

  (5) After contact between the outer tapered surface of the segment die 50 and the inner tapered surface of the mold closing wedge 52, when the mold closing wedge 52 is further pressed downward by a drive mechanism such as a hydraulic cylinder, the number of wedges is reduced to eight. The close contact surface of the segment die 50 formed by the assembly of the die segments 51 is enhanced with a strong force. That is, the mold closing wedge 52 functions as a kind of “tag”.

  (6) Even if the segment die 50 receives a large expansion force due to the molding of the inner molded product M2, the mold closing wedge 52 is continuously pushed downward so that the segment die 50 of the mold closing wedge 52 is not defeated by the closing force.

(7) Then, a molding operation for forming the groove 5 and the V-shaped groove 6 shown in FIG. 5 in the cylindrical portion 3 shown in FIG. The molding operation is as follows.
(7-1) The mold closing wedge 52 retreats upward (FIG. 11).
(7-2) Eight die segments 51 are separated to the outermost side (FIG. 11).
(7-3) The upper punch 54 also stands by above.
(7-4) The mandrel 53 stands by at the normal position in the mold (FIG. 11).
(7-5) The molded product M2 molded in the second step is put on the mandrel 53 and inserted so that the upper end of the mandrel 53 and the hole bottom surface of the hole 4 of the molded product M2 are in contact with each other (FIG. 12).
(7-6) The eight die segments 51 are moved toward the axis Z by a driving device (not shown), and the divided surfaces of the die segments 51 come into contact with each other and come into close contact with each other to stop.
(7-7) A V-shaped groove 6 that is continuous at a predetermined position on the circumferential surface of the cylindrical portion 3 of the molded product M2 is formed by a part of the inner diameter of the eight die segments 51 that are closely integrated. .
(7-8) Speaking of the case shown in the figure, the outer diameter of the cylindrical portion 3 of the molded product M2 and the inner diameter of the segment die 50 formed by the eight die segments 51 are substantially matched to each other. A gap 56 called a die cavity is formed by the outer diameter of the portion 3 and the V-shaped groove 6 (FIG. 13).
(7-9) The mold closing wedge 52 descends from above, and the outer peripheral taper of the segment die 50 and the inner peripheral taper provided on the mold closing wedge 52 come into contact with each other (FIG. 13).
(7-10) Further, the mold closing wedge 52 is pressurized downward, and the adhesion force of each die segment 51 is enhanced by utilizing the taper angle of the inner and outer peripheral tapers.
(7-11) After the integration of the segment die 50 is strengthened as in the previous item (7-10), the upper punch 54 is lowered, and from the surface of the outer diameter portion of the cylindrical portion 3 of the molded product M2, In FIG. 13, pressure is applied downward (FIG. 14).
(7-12) The outer diameter portion of the cylindrical portion 3 of the molded product M2 is swept by the pressing force of the previous item (7-11), and the die segment 51 forms the steel that is the pressed material. It flows and moves into the V-shaped groove (FIG. 14).
(7-13) By the flow movement of the previous item (7-12), the void volume of the V-shaped groove, that is, the void 56 shown in FIG. 13 is reduced, and the air inside thereof is compressed to a high pressure.
The high-pressure air imposes resistance to the inflow of the material, prevents the material from flowing into the entire gap, and cannot form the material into a correct V-shaped groove shape. In order to prevent the occurrence of this phenomenon, a minute hole (not shown) for air escape is provided in a part of the V-shaped groove of the die segment 51.
(7-14) After the upper punch 54 is raised, the mold closing wedge 52 is also depressurized and then retreated upward.
(7-15) Each of the eight die segments 51 forming the segment die 50 retreats away from the axis Z (FIG. 15).
(7-16) The molded product M3 opened from the mold closing wedge 52 is taken out. Grooves 5 and V-shaped grooves 6 are formed in the cylindrical portion 3 of the molded product M3 (FIG. 16).

  In addition, in FIG. 11 thru | or 16, since the inclination part S (refer FIG. 11) formed in the flange part 2 of the molded article M2 is previously formed as one bank which comprises the V-shaped groove | channel 6 as mentioned above. Each of the eight die segments 51 is provided with a shape corresponding to one bank constituting the V-shaped groove 6 in advance.

The material 1 has been described as steel (steel), but is not limited to steel, for example, a hard metal such as iron, bronze, titanium alloy, cobalt alloy, or a soft metal such as aluminum alloy or copper. Metal is also used as the material 11 and can be molded with high accuracy.
The above is the method for forming one step of the V-shaped groove. Next, a method for forming the two V-shaped grooves will be described.

  FIG. 17 to FIG. 26 show another embodiment of the V-shaped groove press forming method according to the present invention, and the cross-section shows the state of the molded product that is cold formed.

  Hereinafter, an embodiment manufacturing process for manufacturing a molded product having the intended shape shown in FIG. 26 will be described in order from FIG. 17 with reference to the drawings. FIG. 17 to FIG. The same reference numerals are assigned to the same reference numerals.

FIG. 17 corresponds to FIG. 1. In FIG. 17, a material 11 having a diameter D and a thickness H ₁₀ (H ₁₀ > H ₀ (see FIG. 1)) is punched from a plate-like material in a blanking process. .

Here, the mass (amount) of the material 11 having the increased volume fraction ΔV in which the thickness H ₁₀ of the material 11 is made thicker than the thickness H ₀ of the material 1 shown in FIG. 26 equivalent to the volume (amount) of the volume of the groove crest portion shown by (ΔV) in FIG. 26 for forming the mold groove 6, and the mass of the material of the increased volume fraction ΔV in FIG. It can be conceptualized as flowing in the groove part indicated by (ΔV). And the remaining volume V minus the increase volume ΔV from the volume of 17 shown the material 11 is equal to the volume of thickness H ₀ in the diameter D of Figure 1 shown blank 1, shown in Figure 26 Of the molded product M17 having the desired shape, the shape excluding the groove portion indicated by (ΔV) is molded into the exact same shape as the molded product M6 having the desired shape shown in FIG. You may think that it suggests. That is, in FIG. 26 in which a molded product M17 having an intended shape is illustrated, in order to form two V-shaped grooves 6 in the cylindrical portion 3 of FIG. In the dimension of the material 1 having the diameter D of 1 and the thickness H ₀ , the mass of the groove portion indicated by (ΔV) is insufficient, so the thickness of the material 11 in FIG. Is previously set as H ₁₀ (H ₁₀ > H ₀ ).

During the first step from the state shown in FIG. 17 to the state shown in FIG. 18, a ring-shaped die (lower die), a punch (upper die), and a knockout pin (lower die) for removing the molded product from the die. 18 using the flange portion 2 having the outer diameter D (same as the diameter of the material 11 in FIG. 17), the smaller diameter outer diameter d (D> d) and the upper end surface of the flange portion 2 having the shape shown in FIG. Forward extrusion molding (processing) is performed to form a cylindrical portion 13 having the same outer diameter d as the small diameter outer diameter d of the flange portion 2 at h ₁₁ (h ₁ <h ₁₁ ). That is, the first molding is performed, and the material 11 having the diameter D and the thickness H ₁₀ becomes the molded product M11.

  In addition, the taper part formed in the flange part 2 is formed so that the mass to be moved later can easily flow, and is expected to become one bank of the V-shaped groove when the V-shaped groove is formed in the future. Of the shape to be made.

  In this first molding, the material volume of the material 11 shown in FIG. 17 is equal to the volume after molding of the molded product M11 shown in FIG. Also in each molding process described below, the volume before and after the molding is the same, and the law of constant volume is always established even if the material flows.

During the second step from the state of FIG. 18 to the state of FIG. 19, the inner diameter of the shape shown in FIG. 19 is obtained using a die (lower die), a punch (upper die), and a knockout pin (upper die). depth d _i h _i hole 4 is provided by the rear extrusion of the second step from the flange portion 2 toward the cylindrical portion 13 (processing). In this second step, the mass corresponding to the volume of the hole 4 removed by the punch at this time moves to the cylindrical portion 13 and maintains the outer diameter d from the bottom surface of the cylindrical portion 13 to the upper end surface of the flange portion 2. 19 to a length h ₁₂ (h ₁₂ > h ₁₁ ), resulting in a molded product M12 shown in FIG.

  By the third step from the state of FIG. 19 to the state of FIG. 20, the molded product M12 shown in FIG. 19 is inverted upside down.

During the fourth step from the state of FIG. 20 to the state of FIG. 21, the segment die 50 composed of a plurality of evenly divided die segments 51 described in detail in FIG. 10 and the like, the mandrel 53, and the upper punch 54, the length from the upper end surface of the cylindrical portion 13 to the bottom surface of the flange portion 2 is as short as h ₁₃ (h ₁₃ <h ₁₂ ) in the shape shown in FIG. Groove ridge extrusion molding is performed while the groove portion 5 and the V-shaped groove 6 are formed in the cylindrical portion 13. That is, a shape member having a flange portion 2 and a cylindrical portion having a hole 4 formed therein, that is, a cylindrical portion having one V-shaped groove 6 on the outer peripheral surface of the column portion 13, using the raw material 11 as a raw material. The molded product M13 shown in FIG. 21 is molded.

  Since the molding of the groove 5 and the V-shaped groove 6 at this time is as described above, detailed description thereof is omitted, but the second groove 15 and V are added to the molded product M13 of FIG. In order to form the mold groove 6, eight die segments 51 each have a medium diameter indicated by a dotted line similar to the medium diameter indicated by a solid line in FIG. 16.

In the fifth step from the state of FIG. 21 to the state of FIG. 22, the plurality of steps equally divided in detail in FIG. 10 and the like are performed in the same manner as the fourth step from the state of FIG. 20 to the state of FIG. The upper end surface of the cylindrical portion 13 having the shape shown in FIG. 22 by the closed die of the segment die 50 constituted by the eight die segments 51 and the mandrel 53, the upper punch 54, the knockout pin 55, etc. To the bottom surface of the flange portion 2 while being shortened to h ₁₄ (h ₁₄ <h ₁₃ ), the groove portion extrusion molding is performed, and the second groove portion 15 and the V-shaped groove 6 are formed in the cylindrical portion 13. The At this time, the outer shape of the second groove 15 is formed in the same D as the outer shape of the flange portion 2.

  That is, a shape member having a flange portion 2 and a cylindrical portion having holes 4 formed therein, that is, a cylindrical portion having two V-shaped grooves 6 on the outer peripheral surface of the column portion 13, using the raw material 11 as a raw material. The molded product M14 shown in FIG. 22 is molded.

  In a sixth step from the state of FIG. 22 to the state of FIG. 23, the molded product M14 shown in FIG. 22 is inverted upside down and returned to the original posture shown in FIG.

During the seventh step from the state of FIG. 23 to the state of FIG. 24, a die (lower die), punch, knockout (upper die), and knockout pin (lower die) are used to obtain the shape shown in FIG. , forward extruded to the hole 7 until the described internal diameter d _i at depth h _i hole 4 deep punch having an outer diameter d _i of _{h l (h l> h i} ) in FIG. 19 is formed.

The mass (amount) corresponding to the volume change of the hole 7 eliminated by the punch at this time, that is, the depth change (= h ₁ −h _i ) at the inner diameter d _i , is transferred to the cylindrical portion 13 of the outer diameter d. Rather than simply extending, as a preparation for securing a mass (amount) sufficient to form a bottomed cylindrical portion 12 (see FIG. 26), which will be described later, and in the next eighth step (from the state of FIG. 24 to FIG. 25). When the hole 9 is formed in the cylindrical portion 13 in the state of FIG. 26, the cylindrical protrusion 8 to be a material (mass) for forming the cylindrical shape in the future, that is, the bottomed cylindrical portion 12 (see FIG. 26) is formed in the cylindrical portion 13. In order to be formed without tearing, the material is moved to the tip of the cylindrical portion 13 to form a cylindrical protrusion 8 having an outer diameter d ₂ (d ₂ ≈d _i ) and a length h ₄ . Seven steps are performed. That is, the molded product M15 is obtained by the fifth molding.

During the eighth step from the state of FIG. 24 to the state of FIG. 25, the inner diameter d ₃ (d ₃ <d _{i) is formed at} the tip of the hole 7 shown in FIG. ), A forward extrusion process for forming a hole 9 having a depth h ₆ is performed. The tip of the hole 9 is formed deeper than the base position P of the cylindrical protrusion 8 (ΔP in FIG. 25). As a result, the thickness of the corner of the base portion of the cylindrical portion 13 marked with a circle A for fleshing in the seventh step is sufficient to withstand the tensile force generated when the hole 9 is formed. In the eighth step, that is, in the sixth molding, even if a tensile force is applied to this part, the cylindrical projection 8 is formed with the hole 9 having the depth h ₆ without being broken from the cylindrical portion 13. (Patent applicants have filed a patent application as Japanese Patent Application No. 2005-37552 for a more detailed description of this part). At this time, the thickness from the tip of the hole 9 to the bottom surface of the cylindrical protrusion 8 is t ₁ (t ₁ <h ₄ ).

During the ninth step from the state shown in FIG. 25 to the state shown in FIG. 26, the punch diameter is adjusted so that the depth h ₆ of the hole 9 having the inner diameter d ₃ is further deepened to a predetermined depth h ₇ (h ₇ > h ₆ ). carried forward extrusion against cylindrical projection 8 of the outer diameter d ₂ than at the d _3, the outer diameter d _2, the bottom thickness t ₂ at the inner diameter _{d 3 (t 2 <t 1} ), the predetermined dimensions of length h ₈ The bottomed cylindrical portion 12 having the following is formed. In other words, the intended molded product M17 having the desired shape is completed by the seventh molding.

  At this time, it goes without saying that the total volume of the molded product M17 shown in FIG. 26 is equivalent to the volume of the material 11 shown in FIG.

  Although the steel 11 has been described as the material 11, the material 11 is not limited to steel. For example, a hard metal such as iron, bronze, titanium alloy, and cobalt alloy, and a soft metal such as aluminum alloy and copper are also used as the material 11. Used, and can be created with high accuracy.

  In the above description, the bottomed cylindrical portion 12 is formed under the flange portion 2. However, a cylindrical shape without a bottom can be similarly formed, and a cylinder without a bottom under the flange portion 2. The case of forming a shape is also included in the scope of the present invention. Further, the cylindrical object in which the V-shaped groove is formed under the flange portion 2 includes a hollow cylinder as well as a column.

  Needless to say, the present invention is applied to a system that simultaneously processes multiple processes in one press.

It is sectional drawing of the Example raw material formed with the blank of the Example press molding method which concerns on this invention. It is sectional drawing of the molded article made | formed at the next process of FIG. It is sectional drawing of the molded article made | formed at the next process of FIG. It is sectional drawing of the molded article made | formed at the next process of FIG. It is sectional drawing of the molded product made | formed at the next process of FIG. It is sectional drawing of the molded article made | formed at the next process of FIG. It is sectional drawing of the molded article made | formed at the next process of FIG. It is sectional drawing of the molded article made | formed at the next process of FIG. It is sectional drawing of the final molded product made | formed at the next process of FIG. It is a plane conceptual diagram of the main part of an occlusion swallow type. It is situation explanatory drawing before mold opening and the molded article M2 insertion. It is situation explanatory drawing when a mold opening and the molded article M2 are inserted so that a mandrel may be covered. It is the structure explanatory drawing of mold closing and forming space (gap) generation. It is explanatory drawing of the flow to the shaping | molding space of the raw material by punch press. It is explanatory drawing of the moving direction of each jig | tool at the time of a mold opening. It is explanatory drawing of taking-out of the molded product M3 shape | molded. It is sectional drawing of one Example raw material formed with the blank of the other Example press molding method which concerns on this invention. FIG. 18 is a cross-sectional view of a molded product made in the next step of FIG. 17. It is sectional drawing of the molded article made | formed at the next process of FIG. FIG. 20 is a cross-sectional view of a molded product made in the next step of FIG. 19. FIG. 21 is a cross-sectional view of a molded product made in the next step of FIG. 20. FIG. 22 is a cross-sectional view of a molded product made in the next step of FIG. 21. FIG. 23 is a cross-sectional view of a molded product made in the next step of FIG. 22. It is sectional drawing of the molded article made | formed at the next process of FIG. FIG. 25 is a cross-sectional view of a molded product made in the next step of FIG. 24. FIG. 26 is a cross-sectional view of the final molded product obtained in the next step of FIG. 25.

Explanation of symbols

1,11 Material 2 Flange 3,13 Cylindrical 4,7,9,10 Hole
5,15 Groove mountain 6 V-shaped groove 8 Cylindrical protrusion 12 Bottomed cylindrical part 50 Segment die 51 Die segment 52 Mold closing wedge 53 Mandrel 54 Upper punch

Claims (6)

Using the raw material as a raw material, a flange portion provided with a first hole in the center portion and a communication hole in a form continuous to the first hole at the lower end of the flange portion are provided, and a V-shaped groove is formed on the circular outer peripheral surface. V-shaped groove press molding for forming a shape member having a cylindrical shape portion having a bottomed cylindrical portion having a second hole in a form continuous with the first hole at a tip portion of the cylindrical shape portion by press working In the method
A first step of forming a flange portion and a cylindrical portion from a raw material as a raw material;
When the plurality of die segments are combined and closely assembled, the outer surface is formed of a tapered surface, and the diameter of the cylindrical portion is included therein. A cylindrical die having a segment die having an equivalent inner diameter and a groove die for forming a V-shaped groove, and a die closing wedge having a taper surface the same as the taper surface of the segment die formed therein; The circular outer peripheral surface of the cylindrical portion formed in the first step by the closing swaging process of the press that causes the material to flow into the gap formed by the V-shaped groove with the segment die when the segment die is engaged A second step of forming a V-shaped groove in
In forming the bottomed cylindrical part having the second hole at the tip of the cylindrical part, the bottomed cylindrical part in the future, which is excluded by the extrusion process for increasing the depth of the first hole, A third step of flowing a sufficient amount of material to form a cylindrical protrusion at the tip of the cylindrical portion, and then forming the second hole;
A V-shaped groove press forming method characterized in that a V-shaped groove is formed in a cylindrical portion by cold forging press processing.   The V-shaped groove press forming method according to claim 1, wherein the flange portion forms one bank of the V-shaped groove.   The segment die composed of the plurality of die segments has a frustum in outer shape, and the mold closing wedge has the same inclined surface as the frustum in the outer shape of the segment die. The V-shaped groove press molding method according to claim 1. The V-shaped groove press forming method according to claim 1, wherein the number of V-shaped grooves formed on the circular outer peripheral surface of the cylindrical portion is one or two. The material, iron containing steels, titanium alloys, cobalt alloys, beryllium alloys, copper alloys containing bronze, V-grooves press molding according to claim 1, characterized in that either a metal containing aluminum alloy Method. A flange portion provided with a first hole in the central portion;
A cylindrical hole formed in the lower end of the flange portion with a communication hole in a form continuous with the first hole, and having one or two V-shaped grooves formed on the circular outer peripheral surface ;
A shape member having a bottomed cylindrical portion having a second hole in a form continuous to the first hole at the tip of the cylindrical shape portion is used as a raw material, and the mass (amount) of the raw material is not increased or decreased. A molded product having a V-shaped groove formed on a circular outer peripheral surface, which is formed by cold forging press working.

Images