JP4996879B2 - Cup-shaped part with flange, molding method thereof and manufacturing apparatus thereof - Google Patents

Description

  The present invention relates to a flanged cup-shaped part, a molding method thereof, and a manufacturing apparatus thereof.

  For example, flanged cup-shaped parts such as parts constituting the yoke of a solenoid valve are generally formed by cutting a bar material, so that the material cost and cutting cost are high, and the manufacturing cost thereof is reduced. A forging material forming method to be suppressed has been desired. In particular, for products that require corrosion resistance and magnetic characteristics, expensive materials such as electromagnetic stainless steel are used. Moreover, when a flange part is polygonal shape, since a cutting process will go through a complicated process and an equipment load will become large according to it, the forging raw material of a polygonal flange is desired from a viewpoint of economical efficiency.

  For example, as a cold forging method for flanged cup-shaped parts, a method for shortening the cold forging process by placing the die in a floating state and simultaneously forming the cup portion and the flange portion as shown in Patent Document 1 has been proposed. ing.

JP-A-8-52530

  However, in the cold forging method of Patent Document 1, the material of the solid blank is extruded by punching into the first cavity where the flange portion is formed and into the second cavity where the cup portion is formed. Since the portion extends at right angles to the moving direction of the punch, it is difficult for the material to flow. Therefore, it is difficult to spread the material to every corner in the first cavity, and there is a problem that molding cannot be performed with high accuracy. In addition, since the material flows in a portion that is bent at a right angle, the stress tends to concentrate on the corners of the cavity, resulting in a problem that the life of the die forming the cavity is shortened.

  An object of the present invention is to provide a flanged cup-shaped part that can be molded with high accuracy even if molded by plastic working and that can improve the life of a die, a molding method thereof, and a manufacturing apparatus thereof. is there.

  In the method for forming a flanged cup-shaped part in the present invention, the intermediate blank is moved in the direction of the second cavity while maintaining the state where the intermediate blank is held between the counter member and the punch. It is characterized by being extruded into a space formed between the inner periphery of the two cavities and the outer periphery of the counter member.

  In addition, the flanged cup-shaped part manufacturing apparatus according to the present invention includes a maintaining unit that maintains a state where the intermediate blank is sandwiched between the punch and the counter member, a die, and a relative moving unit that relatively moves the punch and the counter member. It is characterized by having.

  Further, in the flanged cup-shaped part according to the present invention, the material of the cylinder part and the flange part excluding the bottom part of the flanged cup-shaped part is left with a trace of flow that plastically flows in the axial direction of the flanged cup-shaped part. It is characterized by being.

  According to the present invention, even if a flanged cup-shaped part is molded by plastic working, it can be molded with high accuracy and the life of a die can be improved.

  An example of a high-pressure fuel pump in which the flanged cup component according to the present invention is assembled will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an entire high-pressure fuel pump in which the flanged cup part of the present invention is used as a yoke used for a solenoid valve.

  In the high pressure fuel pump 1, the plunger 3 reciprocates as the cam 2 rotates, and the fuel in the pressurizing chamber 4 is pressurized. The pressurized fuel is discharged from the discharge port 6 by opening the discharge valve 5 as a check valve that allows only the flow to the discharge port 6 side.

  Further, the pressurizing chamber 4 communicates with the low pressure part via the electromagnetic valve 7, and the fuel discharged from the discharge port 6 can be controlled by controlling the electromagnetic valve 7. The electromagnetic valve 7 includes a suction valve 16 that opens and closes a communication portion between the pressurizing chamber 4 and the low pressure portion, and a solenoid 8 for driving the suction valve 16. The solenoid 8 further includes a coil 9 and a solenoid 9. The coils 9 are composed of cores 10a and 10b and a yoke 11 that form a magnetic circuit around the coil 9, and a movable iron core 12. In addition, as a material for the cores 10a and 10b, the yoke 11 and the movable iron core 12, electromagnetic stainless steel is used.

The yoke 11 accommodates the coil 9 in the inner periphery 11f, and the outer periphery has a cylindrical portion 11a formed with a screw portion 13, a bottom portion 11b having a concave surface 14 into which the core 10b is fitted, and a bottom portion 11b of the cylindrical portion 11a. It consists of a hexagonal flange 11c provided on the outer periphery of the side. The entire solenoid valve 7 is fixed to the housing 15 by applying a rotational force to the yoke 11 by the hexagonal flange 11 c and screwing the screw portion 13 into the female screw portion 15 a formed in the housing 15. By comprising in this way, the nut which fixes the solenoid valve 7, and a latching component can be abbreviate | omitted, and it becomes a structure advantageous on a product cost. In order to make the yoke 11 compact, the hexagonal flange 11c is disposed across the outer periphery of the cylindrical part 11a and the bottom part 11b, so that the position of the bottom surface 11e in the bottom part 11b is deeper than the end face 11d of the hexagonal flange 11c. It has become. The flanged cup-shaped part is used as the yoke 11.

  Next, as Example 1 of the present invention, a method for manufacturing a yoke as a flanged cup-shaped part will be described with reference to FIGS. FIG. 2 is a perspective view of the intermediate material of the yoke. Moreover, FIG. 3 is a figure which shows the yoke for every shaping | molding process. FIG. 4 is a view for explaining that the intermediate material of the yoke is extruded from the intermediate blank.

  First, the molding process of the yoke 11 as the flanged cup-shaped part of the present invention will be described with reference to FIG. Fig.3 (a) is a side view which shows a solid blank, and the T direction arrow view of a side view. The solid blank 11-1 has a hexagonal shape whose outer periphery is substantially the same shape as the hexagonal flange 11 c in the yoke 11, and the volume is substantially the same as the volume of the intermediate material 11-3 of the yoke 11. In general, such a solid blank 11-1 is formed by using a part former that forms a cut coil wire into a hexagon by cold forging, and is substantially the same shape as the hexagon flange 11c of the yoke 11. It is good also as the solid blank 11-1 by saw-cutting the bar | burr pulled out to. The solid blank 11-1 is preferably subjected to a heat treatment such as annealing in order to give the necessary deformability in the extrusion process of the next step, and further preferably a surface treatment is performed so that no seizure occurs. .

  The solid blank 11-1 thus formed is accommodated in a die having a cavity having substantially the same shape as that of the hexagonal flange 11c, and the outer periphery of the front end surface is formed in a cylindrical shape with a punch having substantially the same shape as that of the hexagonal flange 11c. The material is plastically flowed by advancing the punch from a state in which the inner periphery 11f of the yoke 11 and the counter surface of the yoke 11 are clamped in the axial direction by the substantially same diameter, as shown in FIG. Intermediate blank 11-2 is forward extruded. FIG. 3B is a side view showing the intermediate blank and a view in the U direction of the side view. In this extrusion molding, the outer periphery of the tip surface is rearward using a counter member having substantially the same shape as the hexagonal flange 11c, and the inner periphery 11f of the yoke 11 formed in a cylindrical shape and a punch having a tip surface having substantially the same diameter. It may be extruded and molded.

The intermediate blank 11-2 thus formed has a hexagonal shape in which the entire axial range on the outer periphery is substantially the same shape as the hexagonal flange 11c of the yoke 11, and the inner periphery is substantially the same as the inner periphery 11f of the yoke 11. It has a cylindrical shape. Further, a bottom portion is left on one end side in the axial direction of the inner periphery, and the thickness of the bottom portion is substantially the same as the bottom portion 11 b of the yoke 11. The axial length of the intermediate blank 11-2 is slightly smaller than the axial length of the yoke 11.

  Next, the intermediate material 11-3 of the yoke 11 as shown in FIG. 3C is formed from the intermediate blank 11-2. The intermediate material 11-3 has a cylindrical shape in a predetermined axial direction on the outer periphery with respect to the intermediate blank 11-2 shown in FIG. 3B, and the entire axial length is also long. FIG. 3C is a side view showing the intermediate material of the molded yoke and a view in the direction of the arrow V in the side view.

  The detailed shape of the intermediate material 11-3 will be described with reference to FIG. Fig.2 (a) is the perspective view mounted so that the hexagon flange side might face the upper direction in the figure. FIG. 2B is a perspective view of the intermediate material 11-3 placed so that the opening side faces upward in the drawing, and a part of the circumferential direction is a cross section.

The intermediate material 11-3 is a cup-shaped part with a flange that is formed in a bottomed cylindrical cup shape and has a flange portion on the bottom 11b side. As shown in FIG. 2A, the flange portion is formed in a hexagonal flange 11c having a substantially hexagonal cross section, and has a predetermined length in the axial direction from the bottom portion 11b. Further, the portion other than the hexagonal flange 11c on the outer peripheral side surface of the intermediate material 11-3 is a substantially cylindrical tube portion 11a, and an end surface 11d is provided at the boundary between the hexagonal flange 11c and the tube portion 11a. As shown in FIG. 2B, the end surface 11d has a tapered shape so as to increase in diameter from the cylindrical portion 11a toward the hexagonal flange 11c.

Moreover, the axial direction reverse side end of the bottom part 11b in the intermediate material 11-3 is opened, and a cylindrical space is formed from the opening part 11g to the bottom part 11b. The axial position of the bottom surface 11e of this space is deeper than the axial position of the end face 11d, and the distance L reaches a depth of about ½ of the axial length of the hexagon flange 11c.

  The yoke 11 shown in FIG. 1 has a concave surface 14 for fitting the core 10b to the bottom surface 11e, and a convex portion 17 is formed on the outer end of the bottom portion 11b. 2 and the intermediate material 11-3 shown in FIG. 3C is formed by further cutting. The thus formed convex portion 17 is provided with a terminal connecting portion 18 for connecting a terminal by molding a resin.

  Next, molding from the intermediate blank 11-2 to the intermediate material 11-3 will be described with reference to FIG. Fig.4 (a) is sectional drawing showing the state just before shape | molding the intermediate blank 11-2 to the intermediate raw material 11-3. FIG. 4B is a cross-sectional view showing a state immediately after the intermediate blank 11-2 is formed into the intermediate material 11-3.

As shown in FIG. 4A, the intermediate blank 11-2 has a first cavity 19 whose inner periphery is formed in a hexagonal shape that is substantially the same as the outer shape of the intermediate blank 11-2, and a radial direction from the first cavity 19. The bottom portion 11b and the opening portion 11g are second in the first cavity 19 of the die 21 having the second cavity 20 continuously provided at one end of the first cavity 19 in the axial direction. It is mounted so as to face the cavity 20. In addition, a tapered surface that increases in diameter from the second cavity 20 toward the first cavity 19 is formed at the boundary surface between the first cavity 19 and the second cavity 20.

  Moreover, the intermediate blank 11-2 mounted in the first cavity has a counter pin 22 as a counter member inserted along the axial direction from the opening 11g and an axially opposite end of the intermediate blank 11-2. It is clamped in the axial direction by the provided punch 23.

  The counter pin 22 is formed in a cylindrical shape having a smaller diameter than the inner diameter of the second cavity 20, and is movably inserted into the die 21 from the second cavity 20 side. For this reason, an annular cylindrical space is formed between the second cavity 20.

The outer periphery of the punch 23 is formed in a substantially hexagonal shape so as to correspond to the inner peripheral shape of the first cavity 19, and is movable with respect to the die 21 in the same manner as the counter pin 22 from the first cavity 19 side. Has been inserted. Unlike the counter pin 22, a gap is not formed as much as possible between the inner periphery of the first cavity 19 and the outer periphery of the punch 23.

  Next, as shown in FIG. 4B from the state of FIG. 4A, the intermediate blank 11-2 and the counter pin 22 are moved in the same direction and at the same speed together with the punch 23 by pressing with the pressing force F2 of the punch 23. In the figure, the outer periphery of the intermediate blank 11-2 is moved in the annular space between the second cavity 20 of the die 21 and the counter pin 22 without changing the thickness of the bottom 11b of the intermediate blank 11-2. Extrusion molding with plastic flow. For this reason, the outer periphery of the extruded intermediate blank 11-2 has a cylindrical shape along the inner periphery of the second cavity 20. In this way, the intermediate material 11-3 as shown in FIGS. 2 and 3C is formed.

  In addition, in the molding process of FIG. 4A to FIG. 4B, it is necessary to always hold the bottom portion 11b. Since the counter pin 22 tends to move with the material flow due to the stress when being pushed out by the pressing force F2 and the frictional force accompanying it, the biasing force F1 that overcomes the frictional force must always be maintained in the molding process. I must. If the counter pin 22 moves away from the bottom surface 11e, there is a possibility that sagging occurs at the corners of the bottom surface 11e and the inner periphery 11f or the bottom portion 11b is deformed.

  The intermediate material 11-3 thus molded is extruded by plastic flow of the material from the solid blank 11-1 in the axial direction to form the intermediate blank 11-2, and the outer periphery of the intermediate blank 11-2. Is further extruded in the axial direction, so that the material of the cylindrical portion 11a excluding the bottom portion 11b and the hexagonal flange 11c is left with a flow trace of plastic flow along the axial direction of the intermediate material 11-3, but the bottom portion 11b Since it is not extruded in the axial direction, no trace of flow along the axial direction of the intermediate material 11-3 is left.

  Next, the manufacturing apparatus of the yoke as a cup-shaped part with a flange is demonstrated based on FIG. Fig.5 (a) is sectional drawing of the state just before shaping | molding in the manufacturing apparatus of a cup-shaped component with a flange. FIG.5 (b) is sectional drawing of the state immediately after shaping | molding in the manufacturing apparatus of a cup-shaped component with a flange. FIG.5 (c) is sectional drawing of the state at the time of the molded article discharge | emission in the manufacturing apparatus of a cup-shaped part with a flange.

As shown in FIG. 5A, the flanged cup-shaped part manufacturing apparatus is inserted from the die 21 having the first cavity 19 and the second cavity 20 and the axial end of the first cavity 19. Are inserted from the axial end side of the second cavity 20 so that an annular gap is formed between the punch 23 provided so as to be relatively movable and the inner peripheral surface of the second cavity 20. Counter pin 22 as a counter member provided so as to be relatively movable, maintenance means for maintaining the intermediate blank 11-2 between the punch 23 and the counter pin 22, the punch 23 and the counter with respect to the die 21 Relative movement means for relatively moving the pin 22 and an annular gap formed between the inner periphery of the second cavity 20 and the outer periphery of the counter pin 22 And a plurality of knockout pins 24. retractable arbitrarily direction end portion.

  The maintenance means makes a plurality of gas springs 25 as urging members arranged on the circumference around the counter pin 22 and all the gas springs 25 abut on the outer peripheral side of one side surface, and their urging force F3 is applied. In order to give to the counter pin 22, it is comprised by the connection board 26 which made the counter pin 22 contact | abut on the other side surface. For this reason, since a plurality of urging forces F3 can be concentrated on one position of the counter pin 22, a high-load urging force F1 can be obtained. Note that a flange-like stopper that restricts the movement of the counter pin 22 relative to the die 21 is provided at the end of the counter pin 22 on the side of the connecting plate 26, so that even if the biasing force F <b> 3 is applied from the gas spring 25, the counter pin 22. More than a predetermined stroke is regulated.

  Although not described in detail in the drawing, the relative moving means is a device that moves the punch 23 to the counter pin 22 side, and is constituted by, for example, a hydraulic cylinder.

  The knockout pins 24 are used to transmit a knockout force F4 and take out a molded product from the cavity. A plurality of the knockout pins 24 are installed on the outer periphery of the counter pin 22 so as to penetrate through the connecting plate 26. For this reason, the load of the some gas spring 25 is put together in one place, the urging | biasing F1 of a high load can be obtained, and the knockout of a molded product is also attained. An extrusion pin 27 can be brought into contact with the end face of the knockout pin 24. The extrusion pin 27 is moved to the die 21 side by hydraulic pressure, air pressure, or the like, and a knockout force F4 is generated at the knockout pin 24. Can be made. The connecting plate 26 may have a cutout shape, and the knockout pin 24 may be passed through the cutout portion.

  As shown in FIG. 5A, the intermediate blank 11-2 is mounted from the punch 23 side to the first cavity 19 in the flanged cup-shaped part manufacturing apparatus configured as described above, and the punch 23 and the counter pin 22 are mounted. To hold the intermediate blank 11-2. At this time, the urging force of the gas spring 25 acts on the counter pin 22 so as to protrude most toward the punch 23 side.

  Next, as shown in FIG. 5B, the punch 23 is pressed against the counter pin 22 with a pressing force F2 by hydraulic pressure or the like. At this time, the urging force F3 by the gas spring 25 is acting on the counter pin 22 in the direction opposite to the pressing force F2. However, the pressing force F2 is larger than the urging force F3, so that the urging force F3 is overcome. The punch 23, the intermediate blank 11-2, and the counter pin 22 are moved toward the gas spring 25 while maintaining the contact state. At that time, the cylindrical portion 11a on the opening 11g side of the intermediate blank 11-2 plastically flows to the second cavity 20 side, and the intermediate material 11-3 of the yoke 11 as a flanged cup-shaped part is formed.

  Further, as shown in FIG. 5 (c), the punch 23 is raised, and the extrusion pin 27 is hydraulically or pneumatically actuated to raise the knockout pin 24 to the molded product side with the knockout force F4, thereby removing the molded product from the cavity. remove.

  Next, the function and effect of this embodiment will be described below.

  In this embodiment, a step of forming a solid blank whose outer shape is formed substantially the same as the flange portion, and a bottomed cylindrical intermediate by forming a space inside without changing the outer shape of the solid blank A step of forming a blank, a first cavity having an inner periphery formed substantially the same as the flange portion, a dimension in a radial direction smaller than the first cavity, and continuously provided at one axial end of the first cavity The intermediate blank is placed in the first cavity of the die having the second cavity formed so that the opening provided at the bottom and the axially opposite end faces the second cavity, and The step of sandwiching the intermediate blank from the axial direction by the counter member inserted from the opening of the intermediate blank and the punch, and the state of being sandwiched by the counter member and the punch The intermediate blank is moved in the direction of the second cavity while being maintained, and the material of the intermediate blank is extruded into a space formed between the inner periphery of the second cavity and the outer periphery of the counter member. Since the cup-shaped part is molded, the flow direction of the material can be matched with the moving direction of the intermediate blank relative to the die. For this reason, since a material can be made to flow without unreasonableness, a highly accurate flanged cup-shaped part can be formed. For this reason, it can apply to a high-pressure fuel supply pump with an inner periphery, a bottom face, and a flange part outer periphery being a forging raw material surface. Moreover, since the intermediate blank and the intermediate material are formed in separate steps, the life of the die can be improved.

  Moreover, since the said intermediate | middle blank is shape | molded by the extrusion molding from the said solid blank, the yield of material can be improved.

  Moreover, since the said solid blank is heat-processed before shape | molding in the said intermediate | middle blank, it can give a deformability required in the extrusion process of the next process.

  Moreover, since the said solid blank is surface-treated before shape | molding in the said intermediate | middle blank, baking does not generate | occur | produce in the extrusion process of the following process.

  Further, by moving the punch and the counter member relative to the die, the material of the intermediate blank is extruded into a space formed between the inner periphery of the second cavity and the outer periphery of the counter member. The material of the intermediate blank can be extruded more easily than moving a heavy die. For this reason, the apparatus which generate | occur | produces the force for extrusion can be made cheap and simple.

  In addition, the flanged cup-shaped part manufacturing apparatus includes a first cavity having an inner periphery formed substantially the same as the flange portion, a dimension in a radial direction smaller than the first cavity, and one axial end of the first cavity. A die having a second cavity provided continuously to the die, a punch inserted from an axial end side of the first cavity and provided to be movable relative to the die, and an inner portion of the second cavity. A counter member which is inserted from the axial end side of the second cavity so as to form an annular gap with the peripheral surface, and is provided so as to be relatively movable with respect to the die; the punch and the counter member A maintaining means for maintaining a state in which an intermediate blank is sandwiched therebetween, a relative moving means for relatively moving the die, and the punch and the counter member are provided. With this manufacturing apparatus, the material can be flowed without difficulty, so that a highly accurate flanged cup-shaped part can be formed.

  Further, the maintaining means is constituted by an urging means acting on the punch or the counter member. For this reason, a maintenance means can be comprised with a simple structure rather than using a hydraulic cylinder etc.

  The maintaining means includes a plurality of urging members and a connecting plate on which the plurality of urging members act, and the punch or the counter member is urged by the connecting plate. By configuring in this way, a plurality of urging forces can be concentrated on one position of the counter member, so that a high load urging force can be obtained.

  The relative moving means moves the punch and the counter member relative to the die. For this reason, it is possible to extrude the material of the intermediate blank more easily than moving a heavy die. For this reason, the apparatus which generate | occur | produces the force for extrusion can be made cheap and simple.

  Further, a knockout pin that can be arbitrarily projected and retracted is provided at an axial end portion of an annular gap formed between the inner periphery of the second cavity and the outer periphery of the counter member. Therefore, the molded product can be easily removed from the cavity.

  In the flanged cup-shaped part formed in this manner, a flow trace that is plastically flowed in the axial direction of the flanged cup-shaped part is left in the material of the cylindrical part excluding the bottom part and the flange part.

  Although the outer shape of the flange portion is formed in a polygonal shape, the manufacturing method of the present embodiment is particularly effective for parts having such a complicated flange shape.

  In addition, in the present Example, although the intermediate blank was shape | molded by cold forging, it is also possible to shape | mold by cutting. In this case, the material of the cylindrical portion excluding the bottom of the flanged cup-shaped part is left with a flow trace of plastic flow in the axial direction, and the material of the flange is not left with a flow trace. Become.

  In this embodiment, the die is fixed and the punch and the counter pin are moved relative to the die. However, the punch and the counter pin can be fixed and the die can be moved.

  Further, in the manufacturing apparatus of the present embodiment, the maintaining means is constituted by a gas spring and a connecting plate, but it is also possible to use a coil spring, a hydraulic drive cylinder or the like instead of the gas spring. If a gas spring is used, a high load can be obtained from the beginning of the stroke, and space can be saved. If a hydraulically driven cylinder is used, a larger load can be obtained.

  Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view of an intermediate material in the yoke of the second embodiment. FIG. 7 is a diagram for explaining that the intermediate material of the yoke is extruded from the intermediate blank.

  First, differences between the second embodiment and the first embodiment will be described with reference to FIG. Fig.6 (a) is the perspective view mounted so that the hexagon flange side might face the upper direction in the figure. FIG. 6B is a perspective view of the intermediate material placed so that the opening side of the intermediate material faces upward in FIG. In addition, about the site | part which is common in Example 1, it represents with the same name and the same code | symbol.

  The intermediate material 11-3 of Example 1 has a flat end surface of the bottom 11b, whereas the intermediate material 11-3 of Example 2 has a convex portion 17 formed on the end surface of the bottom 11b. The point is different. Further, in the intermediate material 11-3 of the first embodiment, the bottom surface 14 is flat, whereas in the intermediate material 11-3 of the second embodiment, the concave surface 14 is formed on the bottom surface 11e. In the first embodiment, the final shape of the yoke 11 shown in FIG. 1 also includes the convex portion 17 and the concave surface 14. However, in the first embodiment, the convex portion 17 and the concave surface 14 are formed by cutting. On the other hand, Example 2 is different in that the convex portion 17 and the concave surface 14 are formed by cold forging.

  The convex portion 17 and the concave surface 14 are provided at the substantially axial center position of the intermediate material 11-3, and the outer periphery of the convex portion 17 and the inner periphery of the concave surface 14 are formed in a cylindrical shape having substantially the same diameter. The concave surface 14 is fitted to the core 10b in the high-pressure fuel pump 1 shown in FIG. 1, and serves as a tray for the core 10b.

  Next, molding from the intermediate blank 11-2 to the intermediate material 11-3 will be described with reference to FIG. Fig.7 (a) is sectional drawing showing the state just before shape | molding the intermediate blank 11-2 to the intermediate raw material 11-3. Moreover, FIG.7 (b) is sectional drawing showing the state immediately after shape | molding the intermediate blank 11-2 to the intermediate raw material 11-3. In addition, about the site | part which is common in Example 1, it represents with the same name and the same code | symbol.

The manufacturing apparatus of the second embodiment and the manufacturing apparatus of the first embodiment are all the same except for the punch 23 and the counter pin 22 as a counter member. While the tip of the punch 23 in the first embodiment is a flat surface, a hole 23a having a predetermined depth is formed at the axial center position of the tip of the punch in the second embodiment. Since the hole 23a is processed by a drill or the like, the bottom surface is recessed in a conical shape. Further, the counter pin 22 in the first embodiment has a simple cylindrical shape, whereas the counter pin 22 in the second embodiment has an insertion hole 22a formed in the axial direction at the axial center position. A cylindrical counter punch 28 is provided in the insertion hole 22 a so as to be movable relative to the counter pin 22 in the axial direction. The counter punch 28 is provided in a fixed state with respect to the die 21, and only the counter pin 22 is configured to move in the axial direction with respect to the counter punch 28.

As shown in FIG. 7A, the manufacturing apparatus configured in this way places an intermediate blank 11-2 in the first cavity 19 in the same manner as in the first embodiment, and attaches the punch 23 and the counter pin 22. Hold it. The counter pin 22 is urged by the urging member such as a gas spring and moved to the punch 23 side as in the first embodiment, but the counter punch 28 does not move with respect to the die 21, so that the counter pin 22 does not move. It will be in the state retracted in the insertion hole 22a formed in the pin 22.

  Next, as shown in FIG. 7B, by pressing with the pressing force F5 of the punch 23, the intermediate blank 11-2 and the counter pin 22 are moved together with the punch 23 by P in the same direction and at the same speed. Then, without changing the thickness of the bottom portion 11b of the intermediate blank 11-2, the outer periphery of the intermediate blank 11-2 is plastically flowed into the annular space between the second cavity 20 of the die 21 and the counter pin 22 and extruded. . At this time, since the counter punch 28 is fixed to the die 21, the counter punch 22 protrudes from the tip of the counter pin 22 when the counter pin 22 strokes more than a predetermined amount. For this reason, the material of the bottom part 11b of the intermediate blank 11-2 extruded by the counter punch 28 generates shear τ and flows into the hole 23a provided in the punch 23. In this way, the convex portion 17 and the concave surface 14 are formed simultaneously with the formation of the intermediate material 11-3.

  As mentioned above, according to Example 2, compared with what forms the convex-shaped part 17 and the concave surface 14 in another process, processing time can be shortened and cost reduction can be aimed at by it. Further, in order to improve the accuracy of the concave surface 14 in order to fit the core 10b, only the radial direction with a cutting allowance of about 0.2 to 0.3 needs to be cut, so the concave surface 14 is cut from a plane. The concave surface 14 can be easily formed as compared with the conventional one.

  Further, if the counter punch 28 is configured to reach the hole 23 a provided in the punch 23, it is possible to perform hole punching.

It is a longitudinal cross-sectional view which shows the whole high-pressure fuel pump which uses the cup component with a flange of this invention as a yoke used for a solenoid valve. 3 is a perspective view of an intermediate material for a yoke in Embodiment 1. FIG. It is a figure which shows the yoke in Example 1 for every shaping | molding process. It is a figure explaining that the intermediate material of the yoke in Example 1 is extruded from an intermediate blank. It is a figure which shows the manufacturing apparatus of the yoke in Example 1. FIG. It is a perspective view of the intermediate material of the yoke in Example 2. FIG. It is a figure explaining that the intermediate material of the yoke in Example 2 is extruded from an intermediate blank.

Explanation of symbols

  Flange cup-shaped parts (11 ... yoke, 11-3 ... intermediate material), 11a ... cylinder, 11b ... bottom, flange (11c ... hexagonal flange), 11g ... opening, 11-1 ... solid blank, 11 -2 ... Intermediate blank, 19 ... First cavity, 20 ... Second cavity, 21 ... Dies, counter member (22 ... Counter pin), 24 ... Knockout pin, 28 ... Counter punch, maintenance means (25 ... Gas spring, 26 ... connecting plate), biasing means (25 ... gas spring).

Claims (10)

A method for forming a flanged cup-shaped part having a flange part provided on the bottom side of a bottomed cylindrical cup-shaped part and a protrusion provided on the bottom part of the cup-shaped part,
The flanged cup-shaped part is
Forming a solid blank having an outer shape substantially identical to the flange portion;
Forming a space in the interior without changing the outer shape of the solid blank and forming a bottomed cylindrical intermediate blank; and
A first cavity having an inner periphery formed substantially the same as the flange portion, and a second cavity having a smaller radial dimension than the first cavity and continuously provided at one axial end of the first cavity. The intermediate blank is placed in the first cavity of the die having the bottom portion and the opening provided at the opposite end in the axial direction is opposed to the second cavity, and inserted from the opening portion of the intermediate blank. A step of sandwiching the intermediate blank from the axial direction by a counter member to be performed and a punch having a concave portion at the axial tip portion;
While maintaining the state of being sandwiched between the counter member and the punch, the intermediate blank is moved toward the second cavity, and the material of the intermediate blank is moved between the inner periphery of the second cavity and the outer periphery of the counter member. A step of extruding a part of the bottom of the intermediate blank into the recess of the punch by a counter punch provided to be relatively movable in the counter member simultaneously with extrusion into the space formed in
A method for forming a flanged cup-shaped part, which is formed by: The intermediate blank material is extruded into a space formed between the inner periphery of the second cavity and the outer periphery of the counter member by moving the punch and the counter member with respect to the die. method of molding off the cup-shaped part mounted flange according to claim 1. A flanged cup-shaped part manufacturing apparatus for forming a flange part on the bottom side of a bottomed cylindrical cup-shaped part and forming a protrusion on the bottom of the cup-shaped part,
This manufacturing equipment
A first cavity having an inner periphery formed substantially the same as the flange portion, and a second cavity having a smaller radial dimension than the first cavity and continuously provided at one axial end of the first cavity. Having dice,
A punch having a recess at the axial tip, inserted from the axial end of the first cavity, and provided so as to be relatively movable with respect to the die;
A counter member which is inserted from the axial end side of the second cavity so as to form an annular gap between the inner peripheral surface of the second cavity and is provided so as to be relatively movable with respect to the die;
A counter punch provided in the counter member so as to be relatively movable;
Maintenance means for maintaining an intermediate blank sandwiched between the punch and the counter member;
A relative movement means for relatively moving the counter punch and the die, and the punch and the counter member;
An apparatus for producing a flanged cup-shaped part. The said maintenance means is comprised by the urging means which acts on the said punch or the said counter member, The manufacturing apparatus of the cup-shaped component with a flange of Claim 3 characterized by the above-mentioned. The maintaining means includes a plurality of biasing members and a connecting plate on which the plurality of biasing members act, and the punch or the counter member is biased by the connecting plate. Item 5. An apparatus for manufacturing a cup-shaped part with a flange according to Item 4 . The said relative movement means moves the said punch and the said counter member with respect to the said die | dye, The manufacturing apparatus of the cup-shaped component with a flange of Claim 3 characterized by the above-mentioned. A knockout pin that can be moved in and out through a hole formed in the connecting plate is provided at an axial end of an annular gap formed between the inner periphery of the second cavity and the outer periphery of the counter member. The manufacturing apparatus of the cup-shaped part with a flange of Claim 5 characterized by the above-mentioned. A flanged cup-shaped part having a flange portion on the bottom side of the bottomed cylindrical cup-shaped part,
2. The method according to claim 1, wherein the cylindrical portion excluding the bottom portion of the flanged cup-shaped part and the material of the flange part are left with traces of plastic flow in the axial direction of the flanged cup-shaped part. Cup-shaped part with flange manufactured by What is described in claim 8 ,
The material of the cylindrical portion excluding the bottom of the flanged cup-shaped part is left with a flow trace of plastic flow in the axial direction, and the flow trace is not left in the material of the flange portion. A cup-shaped part with flange. 10. The flanged cup-shaped component according to claim 9 , wherein an outer shape of the flange portion is formed in a polygonal shape.

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