Ring forging forming device and forming method

Abstract

A ring forging forming device includes a first forming die and a second forming die, wherein the first forming die includes a first lower die and a first upper die movably located above the first lower die, the top surface of the first lower die is provided with a first groove, and the bottom surface of the first upper die is protrudingly provided with a first protrusion; the second forming die includes a second lower die and a second upper die movably located above the second lower die, the top surface of the second lower die is provided with a second groove, and the bottom surface of the second upper die is protrudingly provided with a second protrusion, the height of the second protrusion protruding from the second upper die is less than the height of the first protrusion protruding from the first upper die, and the bottom surface of the second upper die located outside the second protrusion forms a forging portion. In this way, less pressure is required, and the difficulty and cost of production are lower. The present invention also provides a ring forging forming method.

Description

Technical Field

[0001] The invention relates to the technical field of hot forging, in particular to a ring forging forming device and a forming method. Background Art

[0002] Please refer to Figures 1 to 3 When a columnar metal block 30 is heated to about 1100°C, it is first formed into a pancake shape by forging, and then placed in a hot forging lower die 10, and a hot forging upper die 20 is punched downward. A groove 11 is provided on the top surface of the hot forging lower die 10, and a protrusion 21 is protrudingly provided on the bottom surface of the hot forging upper die 20, and a main forming cavity is formed around the protrusion 21 and between the groove 11. The hot forging upper die 20 continuously squeezes the metal block 30, so that the middle part of the metal block 30 becomes thinner to form a middle part 32, and the circumferential part of the metal block 30 gradually fills into the main forming cavity to form an annular part 31. Thereafter, the middle part 32 is punched off, leaving only the annular part 31, which is the product annular forging. The formed annular forging has a middle opening 33 in the middle and a plurality of arc-shaped grooves 34 on the circumferential edge.

[0003] This stamping mode requires a relatively high pressure. In the later stage of stamping, the hot forging upper die 20 needs to act on the middle and circumferential parts of the metal block 30 at the same time. According to actual tests, the pressure required to form a product of a specified size is 1710 tons, that is, 171000 MPa. Figure 8 The driving force required is relatively large, and the manufacturing difficulty and cost are relatively high. Summary of the invention

[0004] In view of this, the present invention provides a ring forging forming device and forming method which requires less pressure and has lower manufacturing difficulty and cost, so as to solve the above problems.

[0005] A ring forging forming device includes a first forming die and a second forming die, the first forming die includes a first lower die and a first upper die movably located above the first lower die, the top surface of the first lower die is provided with a first groove, and the bottom surface of the first upper die is protrudingly provided with a first protrusion; the second forming die includes a second lower die and a second upper die movably located above the second lower die, the top surface of the second lower die is provided with a second groove, and the bottom surface of the second upper die is protrudingly provided with a second protrusion, the height of the second protrusion protruding from the second upper die is less than the height of the first protrusion protruding from the first upper die, and the bottom surface of the second upper die located outside the second protrusion forms a forging portion.

[0006] Further, a metal block is placed in the first groove of the first lower mold, and a first driving unit drives the first upper mold to move downward, so that a thin sheet portion is formed in the middle of the metal block, and the circumference of the metal block protrudes outward to form a first annular portion.

[0007] Furthermore, a convex ring is protrudingly provided at the bottom of the second groove corresponding to the circumferential edge of the second protrusion.

[0008] Furthermore, a plurality of third grooves are axially recessed on the circumferential outer side wall of the second upper mold, and circumferential forming protrusions are protrudingly provided on the inner side wall of the second groove corresponding to the third grooves.

[0009] Furthermore, the metal block is placed in the second groove of the second lower die, the thin sheet portion is located in the area inside the convex ring, and the first annular portion is located outside the convex ring; a second driving unit drives the second upper die to move downward, and the forging portion acts on the first annular portion.

[0010] A ring forging forming method comprises the following steps:

[0011] Step S1: a metal block heated to 1100° C. is forged into a cake shape;

[0012] Step S2: providing a first molding die;

[0013] Step S3: placing the pancake-shaped metal block into the first groove of the first lower mold;

[0014] Step S4: a first driving unit drives the first upper mold to move downward and squeeze the metal block, so that the metal block is squeezed and deformed, the middle part of the metal block becomes thinner to form a thin sheet part, and the circumference of the metal block protrudes outward to form a first annular part;

[0015] Step S5: providing a second molding die;

[0016] Step S6: placing the metal block forged by the first forming die into the second groove of the second lower die;

[0017] Step S7: A second driving unit drives the second upper die to move downward, and the forging portion acts on the first annular portion, so that the first annular portion is pressed into a predetermined shape.

[0018] Compared with the prior art, the ring forging forming device of the present invention includes a first forming die and a second forming die, the first forming die includes a first lower die and a first upper die movably located above the first lower die, the top surface of the first lower die is provided with a first groove, and the bottom surface of the first upper die is protrudingly provided with a first protrusion; the second forming die includes a second lower die and a second upper die movably located above the second lower die, the top surface of the second lower die is provided with a second groove, and the bottom surface of the second upper die is protrudingly provided with a second protrusion, the height of the second protrusion protruding from the second upper die is less than the height of the first protrusion protruding from the first upper die, and the bottom surface of the second upper die located outside the second protrusion forms a forging portion. In this way, less pressure is required, and the difficulty and cost of production are lower. The present invention also provides a ring forging forming method. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The embodiments of the present invention are described below in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 It is a side cross-sectional view of a conventional hot forging die in a first state.

[0021] Figure 2 It is a side cross-sectional view of the conventional hot forging die in the second state.

[0022] Figure 3 It is a three-dimensional schematic diagram of a ring forging.

[0023] Figure 4 A side sectional view of a first forming die of the annular forging forming device provided by the present invention.

[0024] Figure 5 It is a schematic diagram of another state of the first molding die.

[0025] Figure 6 A side sectional view of a second forming die of the annular forging forming device provided by the present invention.

[0026] Figure 7 A partial three-dimensional schematic diagram of the ring forging forming device provided by the present invention.

[0027] Figure 8 This is a pressure test diagram of the existing hot forging die during forming.

[0028] Fig. 9 This is a pressure test diagram when the first molding die is in operation.

[0029] Fig.10 This is a pressure test diagram when the second molding die is in operation. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention are further described in detail below based on the accompanying drawings. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0031] Please refer to Figures 4 to 7 The ring forging forming device provided by the present invention includes a first forming die and a second forming die.

[0032] Please refer to Figure 4 and Figure 5 The first molding die includes a first lower die 110 and a first upper die 120 movably located above the first lower die 110 . A first groove 111 is formed on the top surface of the first lower die 110 . A first protrusion 121 is protrudingly provided on the bottom surface of the first upper die 120 . A step ring 122 is formed on the outer side of the first protrusion 121 of the first upper die 120 .

[0033] A metal block 30 heated to about 1100°C is first forged into a pancake shape, and then placed in the first groove 111 of the first lower die 110. A first driving unit drives the first upper die 120 to move downward, squeezing the metal block 30, so that the metal block 30 is squeezed and deformed, and the middle part becomes thinner to form a thin sheet part 36, and the circumference of the metal block 30 protrudes outward to form a first annular part 35. The first annular part 35 and the step ring 122 have a first gap 112 between them.

[0034] The larger the contact area between the mold and the object, the greater the required pressure. Since the first upper mold 120 only contacts the middle portion of the metal block 30 (i.e., the thin sheet portion 36), the circumferential portion of the metal block 30 (i.e., the first annular portion 35) does not contact the step ring 122 of the first upper mold 120, the pressure applied to the first upper mold 120 can be greatly reduced.

[0035] The thickness of the thin sheet portion 36 is 5 mm.

[0036] When the first molding die is working, the pressure of the first upper die 120 acts on the middle of the metal block 30 through the first protrusion 121. According to the test, the pressure required to punch the middle of the metal block 30 to a predetermined thickness is 611 tons, that is, 61100 MPa. Fig. 9 The step ring 122 of the first upper mold 120 does not contact the first annular portion 35 .

[0037] Please refer to Figure 6 and Figure 7 The second molding die includes a second lower die 130 and a second upper die 140 movably located above the second lower die 130. A second groove 131 is formed on the top surface of the second lower die 130, and a second protrusion 141 is protrudingly provided on the bottom surface of the second upper die 140. The height of the second protrusion 141 protruding from the second upper die 140 is less than the height of the first protrusion 121 protruding from the first upper die 120. For example, the height of the second protrusion 141 protruding from the second upper die 140 is 5 mm less than the height of the first protrusion 121 protruding from the first upper die 120. The portion of the bottom surface of the second upper die 140 located outside the second protrusion 141 forms a forging portion 143.

[0038] The bottom of the second groove 131 is provided with a protruding ring 132 corresponding to the circumferential edge of the second convex block 141. The area of ​​the second groove 131 located inside the protruding ring 132 is the middle area 134. The distance from the middle area 134 to the top surface of the thin sheet portion 36 is 8-10 mm.

[0039] A plurality of third grooves 142 are axially recessed on the circumferential outer side wall of the second upper mold 140 , and circumferential molding protrusions 133 are protrudingly provided on the inner side wall of the second groove 131 corresponding to the third grooves 142 .

[0040] The metal block 30 forged by the first forming die is directly placed into the second groove 131 of the second lower die 130 , the thin sheet portion 36 is located in the area inside the convex ring 132 , and the first annular portion 35 is located outside the convex ring 132 .

[0041] When the second driving unit drives the second upper die 140 to move downward, since the height of the second protrusion 141 protruding from the second upper die 140 is less than the height of the first protrusion 121 protruding from the first upper die 120, the forging portion 143 will act on the first annular portion 35, so that the first annular portion 35 is squeezed into a predetermined shape; the second protrusion 141 contacts the top surface of the thin sheet portion 36, but the middle area 134 does not contact the bottom surface of the thin sheet portion 36, so there is no force between the second protrusion 141 and the thin sheet portion 36, or the force is very small and can be ignored. According to tests, the pressure required for the second upper die 140 to stamp the metal block 30 into a predetermined shape is 814 tons, that is, 81400MPa. Fig.10 shown.

[0042] The protruding ring 132 can prevent a large amount of material from flowing back toward the thin sheet portion 36 when the first annular portion 35 is squeezed and deformed. At the same time, a dent will be formed on the metal block 30 at the protruding ring 132, which is convenient for the subsequent punching and separation of the thin sheet portion 36 and reduces the deformation of the first annular portion 35 during punching.

[0043] The present invention also provides a ring forging forming method, comprising the following steps:

[0044] Step S1: Forging a metal block 30 heated to 1100° C. into a cake shape.

[0045] Step S2: providing a first molding die, the first molding die comprising a first lower die 110 and a first upper die 120 movably located above the first lower die 110 , a first groove 111 being formed on the top surface of the first lower die 110 , and a first protrusion 121 being protruding from the bottom surface of the first upper die 120 .

[0046] Step S3 : placing the pancake-shaped metal block 30 into the first groove 111 of the first lower mold 110 .

[0047] Step S4: a first driving unit drives the first upper mold 120 to move downward and squeeze the metal block 30, so that the metal block 30 is squeezed and deformed, the middle part of the metal block 30 becomes thinner to form a thin sheet part 36, and the circumference of the metal block 30 protrudes outward to form a first annular part 35.

[0048] Step S5: Provide a second molding die, the second molding die includes a second lower die 130 and a second upper die 140 movably located above the second lower die 130, the top surface of the second lower die 130 is provided with a second groove 131, and the bottom surface of the second upper die 140 is protrudingly provided with a second protrusion 141; the height of the second protrusion 141 protruding from the second upper die 140 is less than the height of the first protrusion 121 protruding from the first upper die 120; the bottom surface of the second upper die 140 located outside the second protrusion 141 forms a forging portion 143; the bottom of the second groove 131 is protrudingly provided with a convex ring 132 corresponding to the circumferential edge of the second protrusion 141.

[0049] Step S6: placing the metal block 30 forged by the first forming die into the second groove 131 of the second lower die 130 , with the thin sheet portion 36 of the metal block 30 located within the convex ring 132 and the first annular portion 35 located outside the convex ring 132 .

[0050] Step S7: A second driving unit drives the second upper die 140 to move downward, and the forging portion 143 acts on the first annular portion 35, so that the first annular portion 35 is pressed into a predetermined shape.

[0051] Compared with the prior art, the ring forging forming device of the present invention comprises a first forming die and a second forming die, wherein the first forming die comprises a first lower die 110 and a first upper die 120 movably located above the first lower die 110, a first groove 111 is provided on the top surface of the first lower die 110, and a first protrusion 121 is protrudingly provided on the bottom surface of the first upper die 120; the second forming die comprises a second lower die 130 and a second upper die 140 movably located above the second lower die 130, a second groove 131 is provided on the top surface of the second lower die 130, and a second protrusion 141 is protrudingly provided on the bottom surface of the second upper die 140, the height of the second protrusion 141 protruding from the second upper die 140 is less than the height of the first protrusion 121 protruding from the first upper die 120, and the part of the bottom surface of the second upper die 140 located outside the second protrusion 141 forms a forging portion 143. In this way, less pressure is required, and the difficulty and cost of manufacturing are lower. The present invention also provides a ring forging forming method.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention is included in the scope of the claims of the present invention.

Claims

1. A ring forging forming device, characterized in that: The invention comprises a first molding die and a second molding die, wherein the first molding die comprises a first lower die and a first upper die movably located above the first lower die, a first groove is provided on the top surface of the first lower die, a first protrusion is protrudingly provided on the bottom surface of the first upper die, and the first upper die forms a step ring on the outer side of the first protrusion; the second molding die comprises a second lower die and a second upper die movably located above the second lower die, a second groove is provided on the top surface of the second lower die, a second protrusion is protrudingly provided on the bottom surface of the second upper die, a height of the second protrusion protruding from the second upper die is less than a height of the first protrusion protruding from the first upper die, a forging portion is formed on the bottom surface of the second upper die outside the second protrusion, a protruding ring is protrudingly provided on the bottom of the second groove corresponding to the circumferential edge of the second protrusion, a metal block is placed in the first groove of the first lower die, a first driving unit drives the first upper die to move downward, so that a thin sheet portion is formed in the middle of the metal block, and the circumference of the metal block protrudes outward to form a first annular portion, There is a first gap between the final first annular portion and the step ring, the metal block is placed in the second groove of the second lower die, the thin sheet portion is located in the area inside the convex ring, and the first annular portion is located in the area outside the convex ring; a second driving unit drives the second upper die to move downward, and the forging portion acts on the first annular portion.

2. The ring forging forming device according to claim 1, characterized in that: A plurality of third grooves are axially recessed on the circumferential outer side wall of the second upper mold, and circumferential forming protrusions are protrudingly provided on the inner side wall of the second groove corresponding to the third grooves.

3. A ring forging forming method, using the ring forging forming device according to any one of claims 1 to 2 to forge a metal block, characterized in that: The following steps are involved: Step S1: a metal block heated to 1100° C. is forged into a cake shape; Step S2: providing a first molding die; Step S3: placing the pancake-shaped metal block into the first groove of the first lower mold; Step S4: a first driving unit drives the first upper mold to move downward and squeeze the metal block, so that the metal block is squeezed and deformed, the middle part of the metal block becomes thinner to form a thin sheet part, and the circumference of the metal block protrudes outward to form a first annular part; Step S5: providing a second molding die; Step S6: placing the metal block forged by the first forming die into the second groove of the second lower die; Step S7: A second driving unit drives the second upper die to move downward, and the forging portion acts on the first annular portion, so that the first annular portion is pressed into a predetermined shape.

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