JP2009119508A - Method of separating forged article from divided die and apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of separating a forged article from a divided die, which reduces the size of a divided die drive device and production cost by reducing a force applied to the divided die drive device and enables the forged article and the divided die to be securely separated from each other at a predetermined timing when separating them, and also to provide a forging apparatus using the same. <P>SOLUTION: The method of separating the forged article from the divided die is used for separating the forged article W3 from the divided die 40 after the forged article W3 is molded by the divided die 40 which is divided into a first divided die 41 and a second divided die 42. The forged article W3 and the divided die 40 are separated from each other by pressing a mold parting pin 37 having the first tapered part 37a of the mold parting pin fitted to the tapered part 41e of the divided face of the first divided die and the second inversely tapered part 37b of the mold parting pin fitted to the inversely tapered part 42e of the divided face of the second divided die between the tapered part 41e of the divided face of the first divided die molded at the end face 41d of the first divided die 41 opposite to the second divided die 42 and the inversely tapered part 42e of the divided face of the second divided die molded at the end face 42d of the second divided die of the second divided die 42 opposite to the first divided die 41. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a forging product and a split die separating method and apparatus for forming a forged product by a split die divided into a first split die and a second split die, and separating the formed forged product and the split die.

  Conventionally, when forming a forged product, an upper mold that molds the upper surface of the forged product, a lower mold that molds the lower surface of the forged product, and a side molding unit that divides the forged product into a plurality of parts. A forging device including a split die having a sq. Then, after placing the intermediate molded product molded in a predetermined shape on this lower mold, a plurality of divided molds having side molding parts move forward toward the side surface of the intermediate molded product to hold or press the side surface. To do. Finally, a molding method is known in which the upper die is lowered and the upper surface of the intermediate molded product is pressed to form a forged product (see Patent Documents 1 to 4).

Here, after the forged product is formed by the above forming method, the upper die is raised in a state where the plurality of divided dies constrain the side surface of the forged product. After that, a plurality of split dies are retracted by a split die drive device consisting of a spring, an air cylinder, a hydraulic device, etc., and the split dies are separated from the forged product. Finally, the forged product is moved upward by a knockout attached to the forging device. The forged product is taken out from the mold.
Japanese Utility Model Publication No. 57-11647 Japanese Utility Model Publication No. 58-18648 JP 2007-284876 A JP 2007-50427 A

  However, according to the above-mentioned method for separating the forged product from the split mold, when the forged product is molded with the upper mold, the forged product is attached to the split mold with the side surface of the forged product separated from the forged product by the split mold driving device. When doing so, there is a problem that the split type driving device requires a large driving force and the split type driving device becomes large.

  In addition, due to the sticking, when the forged product and the split die are separated by the split die driving device, there is a problem that the forging product and the split die are separated from each other, and the cycle for forming the forged product is shifted.

  The present invention has been made in view of the above circumstances, reducing the addition to the split-type drive device, reducing the size of the split-type drive device, reducing the manufacturing cost, and when separating the forged product and the split die, It is an object of the present invention to provide a method for separating a forged product and a divided die, which can be reliably separated at a predetermined timing, and an apparatus therefor.

  The method for separating a forged product and a split mold according to the present invention is to form a forged product by a split mold divided into a first split mold and a second split mold, and then separate the forged product and the split mold from each other. In the mold separation method, a tapered first divided mold dividing surface taper portion formed on the end surface of the first divided mold facing the second divided mold of the first divided mold, and a first divided mold of the second divided mold, A taper-shaped parting pin first taper part that fits between the first parting-type parting surface taper part and an inversely tapered second parting-type parting surface taper part formed on the opposing end face of the second parting mold The molded forged product and the split mold are separated by pressing with a mold split pin having a reverse taper-shaped mold split pin and a second taper part fitted to the second split mold split surface taper part. .

  The forging device of the present invention includes a split mold that is divided into a first split mold and a second split mold for forming a forged product, and a split mold that drives the first split mold and the second split mold to be separated from the forged product. The drive unit and the first divided type have a tapered first divided type divided surface taper portion on the end surface of the first divided type facing the second divided type, and the second divided type faces the first divided type. A second split mold having a reverse split tapered second split mold taper section on the end face of the second split mold and inclined in the same direction as the first split mold split taper section; A parting pin having a parting pin second taper part inclined in the same direction as the parting surface taper part, and parting pin first taper part presses the parting part parting surface taper part, and parting pin second taper part A mold split pin driving device for driving the mold split pin so as to press the second split mold split surface taper portion. The features.

  According to the method for separating a forged product and a divided die according to the present invention, after forming the forged product with the divided die divided into the first divided die and the second divided die, the forged product separating the formed forged product and the divided die. And the split-type separation method, a tapered first split-type split surface taper portion formed on the end face of the first split-type facing the second split-type of the first split-type and the first split of the second split-type A taper-shaped parting pin first taper that fits with the first parting mold parting surface taper part between the second parting part parting surface taper part of the reverse taper shape formed on the end face of the second parting die facing the mold Since the molded forged product and the split mold are separated by pressing with a mold splitting pin having a part and a reverse taper-shaped mold split pin second taper part fitted to the second split mold splitting surface taper part, the mold The first split mold taper surface of the first split mold slides on the first taper part of the split pin of the split pin. A split mold drive that slides the second split mold taper surface of the second split mold on the second part of the mold split pin to separate the forged product from the split mold and separate the forged product from the split mold. The addition to the device can be reduced. For this reason, it is possible to reduce the manufacturing cost by reducing the size of the split drive device. Further, since the forged product and the split mold can be reliably separated by the mold split pin, the forged product can be formed at a predetermined timing.

  According to the forging device of the present invention, the split mold divided into the first split mold and the second split mold for forming the forged product, and the first split mold and the second split mold are driven so as to be separated from the forged product. The split-type driving device and the first split type have a tapered first split-type split surface taper portion on the first split-type end face facing the second split type, and the second split type is the first split type A second split mold end face taper portion having a reverse taper shape on the end face of the second split mold faced with the first split mold split face taper portion, and a second parting pin first taper portion inclined in the same direction as the first split mold split face taper portion; A parting pin having a parting pin second taper part inclined in the same direction as the parting mold parting surface taper part, and a parting pin first taper part presses the parting mold parting surface taper part, and parting pin second A mold split pin driving device for driving the mold split pin so that the taper portion presses the second split mold section surface taper portion; Because, apart method of forging a split can be achieved.

  Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional front view showing a forging product forming process of the present invention. FIG. 2 shows a hot forging process for forming a forged product, in which the left half is a partial cross-sectional front view showing a state in which the forged product is formed before the forged product is formed. FIG. 3 shows a hot forging process in which FIG. 2 is rotated by 90 ° about the axis to form a forged product, with the left half before forming the forged product and the right half containing the forged product. It is a fragmentary sectional view showing the state where it formed. FIG. 4 shows a hot forging forming process after forming a forged product, the left half is in a state where the mold split pin is raised and the split die is retracted, and the right half is gold forged by the second knockout. It is a fragmentary sectional front view showing the state taken out from the type | mold. FIG. 5 is a divided plan view. FIG. 6 shows a state in which the split mold is retracted, and the upper half is a plan view in a state in which the initial split mold is retracted, and the lower half is a plan view in a state in which the split mold is further retracted. 7 shows a driving state of the AA portion in FIG. 5, (a) is a cross-sectional front view of the main part showing a state before the split mold is retracted, and (a) is a split mold and a split mold. The principal part sectional front view showing the state where retreat was started by the drive device, (c) is the principal part sectional front view showing the state where the split type further retreated.

  First, a processing shape from the columnar material W0 to the forged product W3 will be described with reference to FIG. As shown in FIG. 1A, a cylindrical material W0 obtained by cutting a wire to a required length is pressed in the axial direction, so that the diameter thereof is larger than that of the material W0 as shown in FIG. Thus, it becomes a substantially cylindrical primary intermediate molded product W1 having a shorter axial length than the material W0. As shown in FIG. 1C, the primary intermediate molded product W1 includes a first recess 10 formed around the axial center at one end in the axial direction, and a first flange 11 formed at the outer periphery at one axial end. The next intermediate molded product W2. The first recess 10 has a first large-diameter cylindrical portion 10a that is substantially cylindrical on the opening side, and a first small-diameter cylindrical portion 10b that is substantially cylindrical and has a diameter smaller than that of the first large-diameter cylindrical portion 10a on the opposite opening side. As shown in FIG. 1D, the secondary intermediate molded product W2 has a second recess 12 formed around the axial center at the other end in the axial direction, and a second flange 13 formed at the outer periphery at the other axial end. Forged product W3 is obtained. The second concave portion 12 has a second large-diameter cylindrical portion 12a on the opening side and a second small-diameter cylindrical portion 12b having a smaller diameter than the second large-diameter cylindrical portion 12a on the opposite opening side.

  Next, the forging device 20 for forming the forged product W3 from the secondary intermediate molded product W2 will be described with reference to FIGS. The forging device 20 includes a lower die 30, a split die 40 that slides on the lower die 30 in a direction perpendicular to the axis, and an upper die 50.

  As shown in FIG. 2, the lower mold 30 is disposed in the axial center portion, and is disposed on the outer periphery of the first knockout 32 and the first knockout 32 constituting a part of the mold carving space 31. The first forging product forming die 33 and the second forging product forming die 34 constituting the part, the lower die first biasing device 35 for biasing the first knockout 32 downward, and the knockout disposed below the first knockout 32 It has a pin 36. Furthermore, as shown in FIG. 3, the lower mold 30 has two mold split pins 37 that can project in the axial direction on the opposed split mold end faces of the split mold 40 described later. A mold split pin urging device 38 that biases the mold split pin 37 downward on the lower outer periphery of the mold split pin 37, and a mold split pin 37, knockout pin 36, and first knockout below the mold split pin 37. And a second knockout 39 as a mold pin driving device for raising 32.

  The split mold 40 is disposed on the upper surface of the lower mold 30 and includes a first split mold 41 and a second split mold 42. The first split mold 41 has a first split mold restraining portion 41a that restrains the outer periphery of the secondary intermediate molded product W2 at one end, a tapered first split mold rear end taper portion 41b at the other end, and a concave shape on the upper surface. It has the 1st division type fitting crevice 41c. Similarly, the second split mold 42 includes a second split mold restraining portion 42a that restrains the outer periphery of the secondary intermediate molded product W2 at one end, a tapered second split mold rear end tapered portion 42b at the other end, and a peripheral portion at the upper surface. It has the 2nd division type fitting crevice 42c dented in the shape. In addition, a first split mold driving device 43 that biases the first split mold 41 radially outward is disposed between the second forged product forming die 34 and the first split mold 41. A second split-type drive device 44 that urges the second split die 42 radially outward is disposed between the second split dies 42 to constitute a split-type drive device 45.

  The upper mold 50 includes a pressing pin 51 disposed in the axial center portion, a first small-diameter convex portion 52a that is disposed on the outer periphery of the pressing pin 51 and projects downward with the same length as the pressing pin 51, and a first small-diameter convex portion. A central punch 52 having a second large-diameter convex portion 52b having a projecting length shorter than the second small-diameter convex portion 52a on the outer periphery of 52a is provided. And the fitting punch 53 which is arrange | positioned on the outer periphery of the center punch 52, has the fitting convex part 53a which protruded in the periphery, is arrange | positioned on the outer periphery of the fitting punch 53, and the 1st division | segmentation type | mold rear end of the 1st division | segmentation mold 41 The first cam lever 54 having the first cam lever taper portion 54a inclined in parallel with the taper portion 41b, similarly, disposed on the outer periphery of the fitting punch 53, and the second divided die rear end taper portion 42b of the second divided die 42, A second cam lever 55 having a second cam lever taper portion 55a inclined in parallel is provided. Further, the upper die 50 includes an upper die first urging device 56 that urges the pressing pin 51 downward, an upper die second urging device 57 that urges the fitting punch 53 and the first cam lever 54 downward, An upper mold third urging device 58 that urges the fitting punch 53 and the second cam lever 55 downward is provided.

  Next, the shapes of the first split mold 41, the second split mold 42, and the mold split pin 37 near the tip of the mold split pin 37 will be described in detail with reference to FIGS. 5 to 7. The first split mold 41 has a tapered first split mold split surface taper portion 41e on the first split mold end face 41d facing the second split mold 42. On the other hand, the second split mold 42 has a second split mold taper portion having an inverted taper shape centering around the first split mold split surface taper portion 41e and the vertical surface 100 on the second split mold end face 42d facing the first split mold 41. 42e. The parting pin 37 is centered on the parting pin first taper part 37a parallel to and fitted to the first parting parting part taper part 41e at the tip, and the parting pin first taper part 37a and the vertical surface 100. It has a reverse taper shape, and has a parting pin first taper part 37b which is parallel to and fits with the second parting die parting surface taper part 42e.

  Next, a method of forming the forged product W3 from the secondary intermediate formed product W2 by the forging device 20 and taking out the formed forged product W3 from the first forged product forming die 33 and the second forged product forming die 34 will be described.

  As shown in the left half part of FIG. 2 and the left half part of FIG. 3, the second forging product forming die 33 of the forging device 30 is obtained by using a transport device (not shown) to form the secondary intermediate molded product W2 formed into a cup shape. And it arrange | positions in the die-sculpture space 31 shape | molded by the 2nd forge goods shaping | molding die 34. FIG. Subsequently, the upper die 50 is lowered, the first cam lever taper portion 54a of the first cam lever 54 comes into contact with the first division die rear end taper portion 41b of the first division die 41, and the first division die rear end taper portion 41b. The first cam lever taper portion 54a slides upward, the first split mold 41 advances, and the first split mold restraining portion 41b restrains the side surface of the secondary intermediate molded product W2. At the same time, the second cam lever tapered portion 55a of the second cam lever 55 abuts on the second divided mold rear end tapered portion 42b of the second divided mold 42, and the second cam lever tapered portion 42b is placed on the second divided mold rear end tapered portion 42b. The part 55a slides, the second split mold 42 moves forward, and the second split mold restraining part 42b restrains the side surface of the secondary intermediate molded product W2. Thereafter, the fitting convex portion 53 a of the fitting punch 53 is formed on the first divided mold fitting concave portion 41 c formed on the first divided die 41 and the second divided die fitting concave portion 42 c formed on the second divided die 42. The first split mold 41 and the second split mold 42 are positioned by fitting. Finally, the pressing pin 51 and the center punch 52 are lowered, the lower die 30 restrains the lower surface of the secondary intermediate molded product W2, and the split die 40 restrains the side surface of the secondary intermediate molded product W2. The die 50 presses the upper surface of the secondary intermediate molded product W2, and a forged product W3 is molded as shown in the right half of FIG. 2 and the right half of FIG.

  When the forming of the forged product W3 is completed, first, the upper die 50 is raised. Subsequently, as shown in the left half part of FIG. 4 and the upper half part of FIG. 6, the second knockout 39 is raised while the forged product W3 is pivotally supported by the first forged product forming die 33, and the second The mold split pin 37 is raised by being pushed by the knockout 39, and the first divided mold 41 and the second divided mold 42 are separated, the forged product W3 and the first divided mold 41 are separated, and the forged product W3 and the second divided mold 41 are separated. 42 is separated at the same time. The first split mold 41 and the second split mold 41 that are separated from each other by the split mold 40 and the forged product W3 and the split mold 40 are, as shown in the lower half of FIG. 43 and the second split-type drive device 44 are further retracted. Thereafter, as shown in the right half part of FIG. 4, the second knockout 39 is further raised, the first knockout 32 is raised through the knockout pin 36, and the forged product W3 is formed with the first forged product forming die 33 and the second forged product formed. It is removed from the die 34.

  Next, based on FIG. 3 to FIG. 5 and FIG. 7, the split of the first split mold 41 and the second split mold 42 by the split pins 37, the separation of the forged product W3 and the first split mold 41, and the forged product. The spacing between W3 and the second split mold 42 will be described in detail. When the forming of the forged product W3 is completed by the upper mold 50, the tip of the mold split pin 37 is positioned inside the first split mold 41 and the second split mold 42 as shown in the right half of FIG. 3 and FIG. The first split mold end face 41d of the first split mold 41 and the second split mold end face 42d of the second split mold 42 are in contact with each other, and the mold is closed. At this time, as shown in FIG. 7A, the first split mold parting surface taper part 41e and the parting pin first taper part 37a of the parting pin 37 are fitted around the tip of the parting pin 37, The second split mold parting surface taper part 42e and the parting pin second taper part 37b of the parting pin 37 are fitted. When the mold split pin 37 is lifted by the second knockout 39, the first split mold 41 is placed on the mold split pin first taper portion 37a of the mold split pin 37 as shown in FIGS. The first split mold dividing surface taper portion 41e slides, and the first split mold 41 moves backward. At the same time, the second split mold parting surface taper part 42e of the second split mold 42 slides on the split pin second taper part 37b of the split pin 37, the second split mold 42 moves backward, The one split mold 41 and the second split mold 42 are separated from each other.

  When the first split mold 41 and the second split mold 42 are separated from each other, the forged product W3 is held by the first forged product forming die 33 at the axial center of the forging device 20 as shown in the left half of FIG. As shown in FIG. 6, only the first split mold 41 and the second split mold 42 are retracted radially outward from the axial center of the forging device 20. For this reason, when the first split mold 41 and the second split mold 42 are separated from each other, the forged product W3 sticks to either the first split mold 41 or the second split mold 42 and moves outward in the radial direction. To prevent. That is, in addition to the separation between the first divided mold 41 and the second divided mold 42, the forged product W3 and the first divided mold 41 are separated, and the forged product W3 and the second divided mold 42 are separated simultaneously.

  As described above, according to the method for separating the forged product W3 and the split mold 40 of the present invention, after forming the forged product W3 with the split mold 40 divided into the first split mold 41 and the second split mold 42, the molding is performed. In the forging product and split mold separating method for separating the forged product W3 and the split mold 40, the tapered first split formed on the first split mold end face 41d facing the second split mold 42 of the first split mold 41 Between the mold dividing surface tapered portion 41e and the second divided mold end surface 42e formed on the second divided mold end surface 42d facing the first divided die 41 of the second divided die 42, the first A taper-shaped parting pin first taper part 37a that fits with the one-part dividing-type parting surface taper part 41e, and a reverse-tapered parting pin second taper part 37b that fits with the second parting-type parting surface taper part 42e. Forged product W formed by pressing with mold split pin 37 having And the split mold 40 are separated from each other, the first split mold splitting surface taper portion 41e of the first split mold 41 slides on the split pin first taper portion 37a of the split pin 37, and the mold of the split pin 37 The second split mold dividing surface taper portion 42e of the second split mold 42 slides on the split pin second super portion 37b, and the forged product W3 is separated from the first split mold 41 and the second split mold 42.

  According to the forging device 20 of the present invention, the divided mold 40 divided into the first divided mold 41 and the second divided mold 42 for forming the forged product W3, and the first divided mold 41 and the second divided mold 42 are forged. The split-type driving device 45 that is driven away from W3 and the first split-type 41 have a first split-type split surface taper portion 41e that is tapered on the first split-type end face 41d that faces the second split-type 42. The second split mold 42 has a second split mold end face taper portion 42e having a reverse taper shape on the second split mold end face 42d facing the first split mold 41, and the first split mold split face taper section. A parting pin 37 having a parting pin first taper part 37a inclined in the same direction as 41e and a parting pin second taper part 37b inclined in the same direction as the second parting mold parting surface taper part 42e, The pin first taper portion 37a is a first split-type split surface taper portion 41. And the mold split pin drive device 39 for driving the mold split pin 37 so that the mold split pin second taper portion 37b presses the second split mold split surface taper portion 42e, and the forged product W3. A separation method of the split mold 40 composed of the first split mold 41 and the second split mold 42 can be realized.

  In the embodiment of the present invention, the mold split pin 37 is attached to the lower mold 30 and the mold split pin 37 is raised to separate the forged product W3 from the first split mold 41 and the second split mold 42. However, the mold split pin is attached to the upper mold, and the tapered first divided mold dividing surface tapered portion is formed on the end face of the first divided mold facing the second divided mold on the upper surface of the first divided mold. Forming a tapered part of the second split mold with the reverse taper shape formed on the end face of the second split mold facing the first split mold on the upper surface of the forging product and separating the forged product from the first split mold and the second split mold May be. At this time, as for the 1st division type division surface taper part and the 2nd division type division surface taper part, the perpendicular section of the direction of an axis to the 1st division type end face and the 2nd division type end face is formed in V shape. In addition, the parting pin attached to the upper mold has a parting pin first taper part inclined in the same direction as the first split mold parting surface taper part at the tip and the same direction as the second parting part parting surface taper part. The mold taper pin 2nd taper part which inclines to is shape | molded.

  In the embodiment of the present invention, the split mold 40 is composed of the first split mold 41 and the second split mold 42, but may be applied to three or more split molds. Further, the mold split pin 37 has a mold split pin first taper portion 37a and a mold split pin first taper portion 37b formed at the tip, but other than the tip (for example, in the middle of the mold pin 37 in the axial direction). You may shape | mold. In addition, the first split mold parting surface taper part 41e and the parting pin first taper part 37a, and the second split parting part taper part 42e and the parting pin second taper part 37b may be in the same direction. , Not limited to parallel. And the upper mold | type 50, the lower mold | type 30, and the division | segmentation die 40 which comprise the forging apparatus 30 may be further divided | segmented or integrated. Although the second knockout 39 is used as the mold pin driving device, other driving devices may be used.

It is a cross-sectional front view showing the formation process of the forged product of this invention. FIG. 3 is a partial cross-sectional front view showing a hot forging forming step for forming the forged product of the present invention, in which the left half part is before the forged product is formed, and the right half part is a state where the forged product is formed. FIG. 2 shows a hot forging process for forming a forged product rotated by 90 ° about the axis, with the left half before forming the forged product and the right half forming the forged product. It is a fragmentary sectional view showing. It represents a hot forging process after forming the forged product of the present invention, the left half is in a state where the mold split pin is raised and the split mold is retracted, and the right half is gold forged by the second knockout. It is a fragmentary sectional front view showing the state taken out from the type | mold. It is a top view of the division type of the present invention. The split mold of the present invention represents a state in which the split mold is retracted, and the upper half is a plan view in a state in which the initial split mold is retracted, and the lower half is a plan view in a state in which the split mold is further retracted. 5 represents the driving state of the A-A part of FIG. 5, (A) is a cross-sectional front view of the main part showing the state before the split mold is retracted, (A) is the split mold is divided by the mold split pin and the split drive unit The principal part sectional front view showing the state which started retreat, (c) is the principal part sectional front view showing the state where the division type retreated further.

Explanation of symbols

37 Mold Split Pin 37a First Tapered Part 37b Second Tapered Part 39 Mold Split Pin Drive Device (Second Knockout)
40 divided mold 41 first divided mold 41e first divided mold dividing surface taper portion 42 second divided mold 42d second divided mold end surface 42e second divided mold dividing surface tapered portion 45 divided mold driving device W3 forged product

Claims (2)

After the forged product (W3) is formed by the divided die (40) divided into the first divided die (41) and the second divided die (42), the formed forged product (W3) and the divided die (40) are separated from each other. In the method of separating the forged product and the split mold,
A tapered first divided mold dividing surface taper portion (41e) formed on the first divided mold end face (41d) facing the second divided mold (42) of the first divided mold (41);
Between the second split mold end surface (42d) facing the first split mold (41) of the second split mold (42) and an inverted tapered second split mold split surface taper portion (42e). The taper-shaped parting pin first taper part (37a) that fits with the first split mold parting surface taper part (41e) and the reverse taper part that fits with the second parting mold parting surface taper part (42e). Press with the mold part pin (37) having the mold part pin second taper part (37b),
A method for separating a forged product and a divided die, wherein the formed forged product (W3) is separated from the divided die (40). A split mold (40) divided into a first split mold (41) and a second split mold (42) for forming the forged product (W3);
A split mold driving device (45) for driving the first split mold (41) and the second split mold (42) so as to be separated from the forged product (W3);
The first split mold (41) has a tapered first split mold split surface taper portion (41e) on the first split mold end face (41d) facing the second split mold (42),
The second split mold (42) has a reverse split tapered second split mold split surface taper portion (42e) on the second split mold end face (42d) facing the first split mold (41).
A mold split pin first taper part (37a) inclined in the same direction as the first split mold parting surface taper part (41e), and a mold part tilting in the same direction as the second parting mold parting surface taper part (42e). A parting pin (37) having a pin second taper part (37b);
The mold part pin first taper part (37a) presses the first split mold parting surface taper part (41e), and the parting pin second taper part (37b) is the second parting mold parting surface taper part ( 42. A forging product and split mold separating device, comprising: a split pin driving device (39) for driving the split pin (37) so as to press 42e).

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