Powder metallurgy forming die for flange piece

Abstract

The utility model provides a powder metallurgy forming die of a flange piece, which belongs to the technical field of powder metallurgy, a forming core rod comprises a forming core rod base, a large forming core rod and a small forming core rod, the large forming core rod is arranged in the middle of the forming core rod base, and the small forming core rod is arranged on the forming core rod base on the periphery of the large forming core rod. The forming large core rod is sleeved with a forming second-lower-punching assembly, the forming second-lower-punching assembly is sleeved with a forming first-lower-punching assembly, the forming first-lower-punching assembly is sleeved with a forming female die, and the forming small core rod sequentially penetrates through the forming first-lower-punching assembly and the forming female die from bottom to top and is sleeved with the forming upper-punching assembly. The large forming core rod and the upper forming punching assembly are arranged in a sleeved mode and fixed through a core rod locking screw. According to the powder metallurgy forming die for the flange piece, the defect caused by uneven product density due to filling difficulty can be effectively improved, and the product quality of the flange piece is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to powder metallurgy technical field especially relates to a flange piece's powder metallurgy forming die. BACKGROUND

[0002] Powder metallurgy products can produce complex structure and high precision parts with little or no machining such as cutting, so as to greatly save material and processing cost, reduce product production cost, and the advantage is particularly obvious in mass production process, but many existing powder metallurgy products have porous shape and close position between holes, which causes filling difficulty and leads to insufficient density of the product after pressing and affects the product performance.

[0003] Although the CNC forming machine can improve the above phenomenon, compared with the mechanical forming machine commonly used in the industry, the CNC forming machine is expensive and can greatly increase the production cost. It is relatively unfavorable under the current fierce market competition, so how to improve the above shortcomings in other aspects has become an important topic. UTILITY MODEL CONTENT

[0004] In view of the deficiencies in the prior art, the utility model provides a powder metallurgy forming die for flange piece, which can effectively improve the poor quality caused by uneven density of the product due to filling difficulty, and further improve the product quality of the flange piece.

[0005] The technical scheme adopted by the utility model is:

[0006] A powder metallurgy forming die for flange piece, wherein: the powder metallurgy forming die comprises a forming negative die, a forming core rod, a forming next lower punch assembly, a forming second lower punch assembly, a forming upper punch assembly and a core rod locking screw, the forming core rod comprises a forming core rod base, a forming large core rod and a forming small core rod, the forming large core rod is arranged in the middle of the forming core rod base, the forming small core rod is arranged on the forming core rod base outside the periphery of the forming large core rod, the forming second lower punch assembly is sleeved on the periphery of the forming large core rod, the forming next lower punch assembly is sleeved on the periphery of the forming second lower punch assembly, the forming negative die is sleeved on the periphery of the forming next lower punch assembly, the forming small core rod passes through the forming next lower punch assembly and the forming negative die in sequence from bottom to top and is sleeved with the forming upper punch assembly, and the forming large core rod and the forming upper punch assembly are sleeved and fixed by the core rod locking screw.

[0007] Preferably, the powder metallurgy forming die for flange piece, wherein: the forming negative die comprises a middle die bushing and a middle die tungsten steel arranged in the middle of the middle die bushing, and a triangular negative die cavity is arranged in the middle of the middle die tungsten steel.

[0008] Preferably, the powder metallurgy forming die of the flange sheet, wherein: the forming large mandrel comprises a forming large mandrel tungsten steel section, a forming large mandrel connecting rod and a forming large mandrel locking screw, the forming large mandrel connecting rod is provided with the forming large mandrel tungsten steel section, the forming large mandrel connecting rod and the forming large mandrel tungsten steel section are fixed by the forming large mandrel locking screw, the forming large mandrel tungsten steel section is provided with a tungsten steel section profile part on the outer periphery, and a section difference through hole matched with the large mandrel locking screw is arranged at the center of the forming large mandrel tungsten steel section; the forming large mandrel tungsten steel section is provided with a forming powder increasing groove with a depth of 1-3 mm, a height of 3-7 mm and a circular arc with a radius of 15-20 mm at the upper end corresponding to the three forming small mandrels.

[0009] Preferably, the powder metallurgy forming die of the flange sheet, wherein: the forming large mandrel connecting rod comprises a forming large mandrel mounting seat and a forming large mandrel connecting rod body arranged on the upper surface of the forming large mandrel mounting seat, and the forming large mandrel connecting rod body is smaller than the outer diameter of the tungsten steel section profile part by 0.1-1 mm; the forming large mandrel mounting seat is a cylinder with a diameter of 35-37 mm and a thickness of 10-12 mm; three groove holes are arranged around the center of the forming large mandrel mounting seat, and a threaded hole matched with the large mandrel locking screw is arranged at the top end of the forming large mandrel connecting rod body.

[0010] Preferably, the powder metallurgy forming die of the flange sheet, wherein: the forming core rod further comprises a core rod upper cover, the core rod upper cover is arranged on the forming core rod base, a forming large mandrel through hole is arranged at the center of the core rod upper cover, and three forming small mandrel through holes and core rod base assembly countersunk holes are arranged on the outer periphery of the forming large mandrel through hole; the forming small mandrel comprises a forming small mandrel mounting seat, a forming small mandrel escape section and a forming small mandrel effective section arranged in sequence from bottom to top; the forming small mandrel escape section is smaller than the outer diameter of the forming small mandrel effective section by 0.1-0.5 mm, and the forming small mandrel mounting seat is matched with the groove hole arranged in the forming large mandrel mounting seat; a forming core rod mounting cavity matched with the forming large mandrel mounting seat and the three forming small mandrel mounting seats is arranged in the middle of the forming core rod base, three core rod base assembly threaded hole matched with the core rod base assembly countersunk holes are arranged on the top surface of the forming core rod base, and a forming core rod base screw column connected with the forming machine equipment is arranged at the bottom end of the forming core rod base.

[0011] Preferably, the flange piece powder metallurgy forming die, wherein: the forming lower one punch assembly includes sequentially arranged from bottom to top forming lower one mounting base, first escape section and forming lower one punch, the escape section is smaller than the outer diameter of forming lower one punch by 0.1-0.5mm, the central part of the forming lower one punch assembly is provided with a through hole, the through hole includes flange cylindrical forming cavity of upper section and second escape section of lower section, the second escape section is larger than the aperture of flange cylindrical forming cavity by 0.1-0.5mm; the central part of the forming lower one punch assembly is provided with first section difference hole, the first section difference hole includes first forming small core rod through first guide section of upper section and first die escape section of lower section, the first forming small core rod through first guide section matches the outer diameter of effective section of the forming small core rod, and the first die escape section is larger than the aperture of first forming small core rod through first guide section by 0.1-0.2mm.

[0012] Preferably, the flange piece powder metallurgy forming die, wherein: the forming lower two punch assembly includes sequentially arranged from bottom to top forming lower two mounting base, second die escape section and lower two punch, the outer periphery of the lower two punch matches the flange cylindrical forming cavity, the second die escape section is smaller than the outer diameter of lower two punch by 0.1-0.5mm, and the central part of the forming lower two punch assembly is provided with lower two central section difference hole, the lower two central section difference hole includes first forming large core rod through first guide hole of upper section matched with tungsten steel section of forming large core rod and third die escape section of lower section larger than the aperture of first forming large core rod through first guide hole by 0.1-0.2mm.

[0013] Preferably, the flange piece powder metallurgy forming die, wherein: the forming upper punch assembly includes sequentially arranged from bottom to top forming upper one mounting base, third escape section and forming upper one punch, the outer periphery of the forming upper one punch matches the triangular cavity of the triangular cavity of the forming female mold, and the third escape section is smaller than the outer diameter of the forming upper one punch by 0.1-0.5mm.

[0014] Preferably, the flange piece powder metallurgy forming die, wherein: the central part of the forming upper punch assembly (6) is provided with upper one central section difference hole, the upper one central section difference hole includes sequentially arranged from top to bottom second forming large core rod through second guide hole and fourth die escape section, the second forming large core rod through second guide hole matches the tungsten steel section of the forming large core rod, and the fourth die escape section is larger than the second forming large core rod through second guide hole by 0.1-0.2mm; the center of the forming upper one punch is provided with second section difference hole, the second section difference hole includes second forming small core rod through second guide section of upper section matched with the outer diameter of effective section of the forming small core rod and fifth die escape section of lower section larger than the aperture of second forming small core rod through second guide section by 0.1-0.2mm.

[0015] The flange piece powder metallurgy forming die has the advantages that:

[0016] The powder metallurgy forming die of the flange sheet can effectively improve the defects caused by uneven product density due to filling difficulty, and further improves the product quality of the flange sheet. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a top view of the flange sheet.

[0018] Figure 2 It is a three-dimensional view of the flange sheet.

[0019] Figure 3 It is a three-dimensional view of the forming female die of the utility model.

[0020] Figure 4 It is a three-dimensional partial sectional view of the forming large core rod tungsten steel of the utility model.

[0021] Figure 5 It is a three-dimensional view of the forming large core rod connecting rod of the utility model.

[0022] Figure 6 It is a sectional view of the forming large core rod of the utility model.

[0023] Figure 7 It is a three-dimensional view of the forming small core rod of the utility model.

[0024] Figure 8 It is a three-dimensional view of the forming core rod upper cover of the utility model.

[0025] Figure 9 It is a three-dimensional view of the forming core rod base of the utility model.

[0026] Figure 10 It is a three-dimensional partial sectional view of the forming core rod of the utility model.

[0027] Figure 11 It is a three-dimensional partial sectional view of the forming next punch assembly of the utility model.

[0028] Figure 12 It is a three-dimensional partial sectional view of the forming second punch assembly of the utility model.

[0029] Figure 13 It is a three-dimensional partial sectional view of the forming upper punch assembly of the utility model.

[0030] Figure 14 It is a three-dimensional partial sectional view of the flange sheet forming die assembly of the utility model. DETAILED DESCRIPTION

[0031] The utility model will be further described below in combination with specific drawings and examples.

[0032] AsFigure 1 And Figure 2 The flange profile 1-1 of the flange sheet 1 is a triangular profile, and a flange cylinder 1-2 is arranged at the bottom surface, a center through hole 1-3 is arranged at the middle part, and flange mounting holes 1-4 with the same pitch circle diameter are arranged at three corner points of the triangular profile 1-1 respectively, the flange sheet 1 product of the utility model has the phenomenon that the positions of the holes are relatively close, and the density of the products A, B and C is not uniform, which affects the product performance; in consideration of the cost, the product performance affected by the non-uniform density can be effectively improved without replacing the forming machine equipment, and the problem of insufficient product density is solved by the following technical scheme.

[0033] As Figures 3-14 A powder metallurgy forming die of a flange sheet, the powder metallurgy forming die comprises a forming negative die 2, a forming core rod 3, a forming lower first punch assembly 4, a forming lower second punch assembly 5, a forming upper punch assembly 6 and a core rod locking screw 7, the forming core rod 3 comprises a forming core rod base 3-4, a forming large core rod 3-1 and a forming small core rod 3-2, the forming large core rod 3-1 is arranged in the middle of the forming core rod base 3-4, the forming small core rod 3-2 is arranged on the outer periphery of the forming core rod base 3-4 outside the forming large core rod 3-1, the forming lower second punch assembly 5 is sleeved on the outer periphery of the forming large core rod 3-1, the forming lower first punch assembly 4 is sleeved on the outer periphery of the forming lower second punch assembly 5, the forming negative die 2 is sleeved on the outer periphery of the forming lower first punch assembly 4, the forming small core rod 3-2 sequentially passes through the forming lower first punch assembly 4 and the forming negative die 2 from bottom to top and is sleeved with the forming upper punch assembly 6, and the forming large core rod 3-1 is sleeved with the forming upper punch assembly 6 and is fixed through the core rod locking screw 7.

[0034] The forming negative die 2 comprises a middle die bushing 2-1 and a middle die tungsten steel 2-2 arranged in the middle of the middle die bushing 2-1, and the middle die tungsten steel 2-2 is arranged with a triangular negative die cavity 2-2-1 in the middle.

[0035] The forming large core rod 3-1 comprises a forming large core rod tungsten steel section 3-1-1, a forming large core rod connecting rod 3-1-2 and a forming large core rod locking screw 3-1-3, the forming large core rod tungsten steel section 3-1-1 is arranged on the forming large core rod connecting rod 3-1-2, the forming large core rod connecting rod 3-1-2 and the forming large core rod tungsten steel section 3-1-1 are fixed through the forming large core rod locking screw 3-1-3, a tungsten steel section profile part 3-1-11 is arranged on the outer periphery of the forming large core rod tungsten steel section 3-1-1, a section difference through hole 3-1-12 matched with the large core rod locking screw 7 is arranged in the center of the forming large core rod tungsten steel section 3-1-1, and a forming powder increasing groove 3-5 with a depth of 1-3 mm, a height of 3-7 mm and a circular arc with a radius of 15-20 is arranged at the positions corresponding to the three forming small core rods 3-2 on the upper end of the forming large core rod tungsten steel section 3-1-1.

[0036] The shaped mandrel connecting rod 3-1-2 comprises a shaped mandrel mounting seat 3-1-22 and a shaped mandrel connecting rod body 3-1-21 arranged on the upper surface of the shaped mandrel mounting seat 3-1-22, the shaped mandrel connecting rod body 3-1-21 is 0.1-1mm smaller than the outer diameter of the tungsten steel section profile 3-1-11; the shaped mandrel mounting seat 3-1-22 is a cylinder with a diameter of 35-37mm and a thickness of 10-12mm; the shaped mandrel mounting seat 3-1-22 is provided with three slot holes 3-1-23 around the center, and the top end of the shaped mandrel connecting rod body 3-1-21 is provided with a threaded hole 3-1-24 matched with the mandrel locking screw 3-1-3.

[0037] The shaped mandrel 3 further comprises a mandrel upper cover 3-3 arranged on the shaped mandrel base 3-4, a shaped mandrel through hole 3-3-1 is arranged at the center of the mandrel upper cover 3-3, three shaped small mandrel through holes 3-3-2 and mandrel seat assembly counterbore holes 3-3-3 are arranged on the outer periphery of the shaped mandrel through hole 3-3-1; the shaped small mandrel through hole 3-3-2 is three, the shaped small mandrel through hole 3-3-2 allows the small mandrel effective section 3-3-1 to pass through but does not allow the small mandrel mounting seat 3-2-3 to pass through, the shaped small mandrel 3-2 comprises a shaped small mandrel mounting seat 3-2-3, a shaped small mandrel escape section 3-2-2 and a shaped small mandrel effective section 3-2-1 arranged in sequence from bottom to top; the shaped small mandrel escape section 3-2-2 is 0.1-0.5mm smaller than the outer diameter of the shaped small mandrel effective section 3-2-1, the shaped small mandrel mounting seat 3-2-3 cooperates with the slot hole 3-1-23 arranged in the shaped mandrel mounting seat 3-1-22; the shaped mandrel base 3-4 is provided with a shaped mandrel mounting cavity 3-4-1 matched with the shaped mandrel mounting seat 3-1-22 and the three shaped small mandrel mounting seats 3-2-3 in the middle, three mandrel seat assembly threaded holes 3-4-2 matched with the mandrel seat assembly counterbore holes 3-3-3 are arranged on the top surface of the shaped mandrel base 3-4, and a shaped mandrel base stud 3-4-3 connected with the shaping machine equipment is arranged at the bottom end of the shaped mandrel base 3-4.

[0038] The forming lower first punch assembly 4 comprises a forming lower first mounting base 4-3, a first material escape section 4-2 and a forming lower first punch 4-1 arranged in sequence from bottom to top, the first material escape section 4-2 is 0.1-0.5mm smaller than the forming lower first punch 4-1 in outer diameter, the forming lower first punch assembly 4 is provided with a through hole in the center part, the through hole comprises a flange cylindrical forming cavity 4-4 in the upper section and a second material escape section 4-5 in the lower section, the second material escape section 4-5 is 0.1-0.5mm larger than the flange cylindrical forming cavity 4-4 in hole diameter; the forming lower first punch assembly 4 is provided with a first stepped hole in the center, the first stepped hole comprises a first forming small mandrel passing through a first guide section 4-6 in the upper section and a first die material escape section 4-7 in the lower section, the first forming small mandrel passing through the first guide section 4-6 matches the outer diameter of the effective section 3-2-1 of the forming small mandrel, and the first die material escape section 4-7 is 0.1-0.2mm larger than the first forming small mandrel passing through the first guide section 4-6 in hole diameter.

[0039] The forming lower second punch assembly 5 comprises a forming lower second mounting base 5-3, a second die material escape section 5-2 and a lower second punch 5-1 arranged in sequence from bottom to top, the outer periphery of the lower second punch 5-1 matches the flange cylindrical forming cavity 4-4, the second die material escape section 5-2 is 0.1-0.5mm smaller than the lower second punch 5-1 in outer diameter, and the forming lower second punch assembly 5 is provided with a lower second center stepped hole in the center part, the lower second center stepped hole comprises a first forming large mandrel passing through a first guide hole 5-4 in the upper section matched with the tungsten steel section 3-1-1 of the forming large mandrel, and a third die material escape section 5-5 in the lower section which is 0.1-0.2mm larger than the first forming large mandrel passing through the first guide hole 5-4 in hole diameter.

[0040] The forming upper punch assembly 6 comprises a forming upper first mounting base 6-3, a third material escape section 6-2 and a forming upper first punch 6-1 arranged in sequence from bottom to top, the outer periphery of the forming upper first punch 6-1 matches the triangular cavity 3-3 of the triangular die cavity 3-3 in the forming female die 2, and the third material escape section 6-2 is 0.1-0.5mm smaller than the forming upper first punch 6-1 in outer diameter.

[0041] The upper center part of the forming upper punch assembly 6 is provided with an upper center segment hole, which includes a second forming large mandrel passing through a second guide hole 6-4 and a fourth mold escape segment 6-5 from top to bottom, the second forming large mandrel passing through the second guide hole 6-4 cooperates with the forming large mandrel tungsten steel segment 3-1-1, and the fourth mold escape segment 6-5 is larger than the second forming large mandrel passing through the second guide hole 6-4 by 0.1-0.2 mm; the center of the forming upper punch assembly 6 is provided with a second segment hole, which includes a second forming small mandrel passing through a second guide segment 6-6 with an upper segment matched with the outer diameter of the effective segment 3-2-1 of the forming small mandrel, and a lower segment of the fifth mold escape segment 6-7 larger than the second forming small mandrel passing through the second guide segment 6-6 by 0.1-0.2 mm.

[0042] The forming mandrel 3 is specifically installed in the following manner:

[0043] First, the forming large mandrel tungsten steel segment 3-1-1 is assembled with the forming large mandrel connecting rod 3-1-2, and then locked by the forming large mandrel locking screw 3-1-3 to form the forming large mandrel 3-1. After the assembled forming large mandrel 3-1 and the three forming small mandrels 3-2 are respectively matched with the forming large mandrel mounting seat 3-1-22 and the forming small mandrel mounting seat 3-2-3 in the forming base 3-4, the mandrel upper cover 3-3 is sleeved into the forming large mandrel 3-1 and the forming small mandrel 3-2 from top to bottom, and then the forming mandrel upper cover 3-3 is locked with the forming mandrel base 3-4 by using screws. At this time, the forming powder increasing groove 3-5 with a depth of 1-3 mm, a height of 3-7 mm and a circular arc with a radius of 15-20 is arranged on the upper end of the tungsten steel segment profile 3-1-11 corresponding to the three forming small mandrels 3-2.

[0044] When the whole mold is installed, first, the forming mandrel 3 is fixed on the forming machine by the forming mandrel base stud 3-4-3, and then the forming large mandrel passing through the first guide hole 5-4 and the third mold escape segment 5-5 of the forming lower second punch assembly 5 is fixed on the forming machine device from top to bottom after passing through the forming large mandrel 3-1.

[0045] After the two-section through hole of the flange cylindrical forming cavity 4-4 and the second escape segment 4-5 of the forming lower next punch assembly 4, the first forming small mandrel passing through the first guide segment 4-6 and the first mold escape segment 4-7 of the lower segment are respectively aligned with the forming lower second punch assembly 5 and the three forming small mandrels 3-2, they are respectively sleeved into and fixed on the forming machine device from top to bottom.

[0046] After the triangular cavity 2-2-1 of the forming female die 2 is aligned with the forming lower next punch 4-1 of the forming lower next punch assembly 4, it is sleeved into the forming lower next punch assembly and fixed on the forming machine device.

[0047] With the upper forming punch 6-1 of the forming upper punch assembly 6 facing downwards, and the upper forming punch 6-1, the large forming mandrel, and the small forming mandrel passing through the second guide hole 6-4 and the second guide section 6-6 respectively corresponding to the triangular female mold cavity 3-3, the large forming mandrel 3-1, and the three small forming mandrels 3-2, and then fixed on the forming machine, the forming machine and each mold are adjusted to the filling position. At this time, the feeding box on the forming machine will send the powder material to the set triangular female mold cavity 2-2-1 and fill it. Relatively speaking, the forming powder-increasing groove 3-5 set in the large forming mandrel 3-1 is also filled with powder material at the same time. When the mold moves to the forming position, the powder material in the set forming powder-increasing groove 3-5 will fall down between the large forming mandrel 3-1 and the three small forming mandrels 3-2, which can increase the supply of powder material to the A, B, and C areas of the flange 1, thereby improving the product performance due to insufficient density after pressing caused by filling difficulties.

[0048] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A powder metallurgical forming die for a flange sheet, characterized in that: The powder metallurgy forming die comprises a forming negative die (2), a forming core rod (3), a forming lower first punch assembly (4), a forming lower second punch assembly (5), a forming upper punch assembly (6), and a core rod locking screw (7). The forming core rod (3) comprises a forming core rod base (3-4), a forming large core rod (3-1), and a forming small core rod (3-2). The forming large core rod (3-1) is arranged in the middle of the forming core rod base (3-4), and the forming small core rod (3-2) is arranged on the forming core rod base (3-4) at the outer periphery of the forming large core rod (3-1). The forming large core rod (3-1) is sleeved with the forming lower second punch assembly (5), the forming lower second punch assembly (5) is sleeved with the forming lower first punch assembly (4), the forming lower first punch assembly (4) is sleeved with the forming negative die (2), the forming small core rod (3-2) sequentially passes through the forming lower first punch assembly (4) and the forming negative die (2) from bottom to top and is sleeved with the forming upper punch assembly (6), and the forming large core rod (3-1) is sleeved with the forming upper punch assembly (6) and is fixed by the core rod locking screw (7). The forming negative die (2) comprises a middle die bushing (2-1) and a middle die tungsten steel (2-2) arranged in the middle of the middle die bushing (2-1), and a triangular negative die cavity (2-2-1) is arranged in the middle of the middle die tungsten steel (2-2). The forming large core rod (3-1) comprises a forming large core rod tungsten steel section (3-1-1), a forming large core rod connecting rod (3-1-2), and a forming large core rod locking screw (3-1-3). The forming large core rod connecting rod (3-1-2) is provided with the forming large core rod tungsten steel section (3-1-1), and the forming large core rod tungsten steel section (3-1-1) is provided with a forming powder increasing groove (3-5) at the upper end corresponding to each of the three forming small core rods (3-2).

2. The powder metallurgical forming die for flange sheets according to claim 1, characterized in that: The forming large core rod connecting rod (3-1-2) and the forming large core rod tungsten steel section (3-1-1) are fixed by the forming large core rod locking screw (3-1-3). The forming large core rod tungsten steel section (3-1-1) is provided with a tungsten steel section contour portion (3-1-11) at the outer periphery and a section difference through hole (3-1-12) at the center for cooperating with the large core rod locking screw (7). The forming powder increasing groove (3-5) has a depth of 1-3 mm, a height of 3-7 mm, and a circular arc radius of 15-20 mm.

3. The powder metallurgical forming die for flange sheets according to claim 2, characterized in that: The shaped large mandrel connecting rod (3-1-2) comprises a shaped large mandrel mounting seat (3-1-22) and a shaped large mandrel connecting rod body (3-1-21) arranged on the upper surface of the shaped large mandrel mounting seat (3-1-22), the shaped large mandrel connecting rod body (3-1-21) is 0.1-1mm smaller than the outer diameter of the tungsten steel section profile (3-1-11); the shaped large mandrel mounting seat (3-1-22) is a cylinder with a diameter of 35-37mm and a thickness of 10-12mm; three slot holes (3-1-23) are arranged around the center of the shaped large mandrel mounting seat (3-1-22), and a threaded hole (3-1-24) matched with the mandrel locking screw (3-1-3) is arranged at the top end of the shaped large mandrel connecting rod body (3-1-21).

4. The powder metallurgical forming die for flange sheets according to claim 3, characterized in that: The shaped mandrel (3) further comprises a mandrel upper cover (3-3), the mandrel upper cover (3-3) is arranged on the shaped mandrel base (3-4), a shaped large mandrel through hole (3-3-1) is arranged at the center of the mandrel upper cover (3-3), three shaped small mandrel through holes (3-3-2) and mandrel seat assembly counterbore holes (3-3-3) are arranged around the shaped large mandrel through hole (3-3-1); the shaped small mandrel (3-2) comprises a shaped small mandrel mounting seat (3-2-3), a shaped small mandrel escape section (3-2-2) and a shaped small mandrel effective section (3-2-1) arranged in sequence from bottom to top; the outer diameter of the shaped small mandrel escape section (3-2-2) is 0.1-0.5mm smaller than that of the shaped small mandrel effective section (3-2-1), the shaped small mandrel mounting seat (3-2-3) is matched with the slot hole (3-1-23) arranged in the shaped large mandrel mounting seat (3-1-22); a shaped mandrel mounting cavity (3-4-1) matched with the shaped large mandrel mounting seat (3-1-22) and three shaped small mandrel mounting seats (3-2-3) is arranged in the middle of the shaped mandrel base (3-4), three mandrel seat assembly threaded holes (3-4-2) matched with the mandrel seat assembly counterbore holes (3-3-3) are arranged on the top surface of the shaped mandrel base (3-4), and a shaped mandrel base threaded column (3-4-3) connected with the forming machine equipment is arranged at the bottom end of the shaped mandrel base (3-4).

5. The powder metallurgical forming die for flange sheets according to claim 4, characterized in that: The lower forming punch assembly (4) comprises a lower forming punch mounting base (4-3), a first escape section (4-2) and a lower forming punch (4-1) arranged in sequence from bottom to top, the escape section (4-2) is 0.1-0.5mm smaller than the outer diameter of the lower forming punch (4-1), a through hole is arranged at the center of the lower forming punch assembly (4), the through hole comprises a flange cylindrical forming cavity (4-4) of the upper section and a second escape section (4-5) of the lower section, the second escape section (4-5) is 0.1-0.5mm larger than the hole diameter of the flange cylindrical forming cavity (4-4); a first stepped hole is arranged at the center of the lower forming punch assembly (4), the first stepped hole comprises a first forming small mandrel passing through a first guide section (4-6) of the upper section and a first mold escape section (4-7) of the lower section, the first forming small mandrel passing through the first guide section (4-6) matches the outer diameter of the effective section (3-2-1) of the forming small mandrel, and the first mold escape section (4-7) is 0.1-0.2mm larger than the hole diameter of the first forming small mandrel passing through the first guide section (4-6).

6. The powder metallurgical forming die for flange sheets according to claim 5, characterized in that: The lower forming punch assembly (4) comprises a lower forming punch mounting base (4-3), a first escape section (4-2) and a lower forming punch (4-1) arranged in sequence from bottom to top, the escape section (4-2) is 0.1-0.5mm smaller than the outer diameter of the lower forming punch (4-1), a through hole is arranged at the center of the lower forming punch assembly (4), the through hole comprises a flange cylindrical forming cavity (4-4) of the upper section and a second escape section (4-5) of the lower section, the second escape section (4-5) is 0.1-0.5mm larger than the hole diameter of the flange cylindrical forming cavity (4-4); a first stepped hole is arranged at the center of the lower forming punch assembly (4), the first stepped hole comprises a first forming small mandrel passing through a first guide section (4-6) of the upper section and a first mold escape section (4-7) of the lower section, the first forming small mandrel passing through the first guide section (4-6) matches the outer diameter of the effective section (3-2-1) of the forming small mandrel, and the first mold escape section (4-7) is 0.1-0.2mm larger than the hole diameter of the first forming small mandrel passing through the first guide section (4-6).

7. The powder metallurgical forming die for flange sheets according to claim 1, characterized in that: The upper forming punch assembly (6) comprises an upper forming punch mounting base (6-3), a third escape section (6-2) and an upper forming punch (6-1) arranged in sequence from bottom to top, the outer periphery of the upper forming punch (6-1) matches the triangular cavity (2-2-1) of the triangular female die of the forming female die (2), and the third escape section (6-2) is 0.1-0.5mm smaller than the outer diameter of the upper forming punch (6-1).

8. The powder metallurgical forming die for flange sheets according to claim 7, characterized in that: The upper center section of the upper punch assembly (6) is provided with an upper center section differential hole, which includes a second forming large core rod passing through a second guide hole (6-4) and a fourth mold escape section (6-5) arranged in sequence from top to bottom. The second forming large core rod passing through the second guide hole (6-4) is matched with the forming large core rod tungsten steel section (3-1-1), and the fourth mold escape section (6-5) is larger than the second forming large core rod passing through the second guide hole (6-4) by 0.1-0.2 mm. The center of the upper punch (6) is provided with a second differential hole, which includes a second forming small core rod passing through a second guide section (6-6) matched with the outer diameter of the effective section (3-2-1) of the forming small core rod, and a fifth mold escape section (6-7) larger than the second forming small core rod passing through the second guide section (6-6) by 0.1-0.2 mm.

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