Three-way valve body forging multi-directional die forging forming die and forming method thereof

Abstract

The present application relates to a mold, in particular to a multi-directional die forging forming mold for a three-way valve body forging and a forming method thereof. The mold comprises a lower die sleeve, an upper die sleeve, a horizontal punch, a vertical punch, a lower die core and an upper die core are respectively arranged in the lower die sleeve and the upper die sleeve, the lower die core is provided with a lower ejector, the vertical punch penetrates through the upper die sleeve, a beam pad is arranged on the upper part of the upper die sleeve, a pressing block is inserted on the upper part of the upper die core, a through hole is formed in the pressing block and a flange structure is arranged on the upper end of the pressing block, a pressing ring is arranged on the top end of the flange structure, the pressing ring is located below the beam pad, and the vertical punch penetrates through the beam pad, the pressing ring and the pressing block in sequence; two adjusting half-rings are symmetrically arranged between the lower die core and the upper die core, and two horizontal punches penetrate through the two adjusting half-rings respectively. The present application completely avoids various flash problems of the three-way forging in multi-directional die forging production, improves the forming quality and production efficiency of the forging, and prolongs the service life of the mold.

Description

Technical Field

[0001] This invention relates to molds, and in particular to a multi-directional forging mold for a three-way valve body and its forming method. Background Technology

[0002] Currently, the multi-directional die forging process for three-way valve body forgings is mature, and most forgings achieve edgeless forgings with three-way cavities. However, for three-way valve body forgings with a small height-to-length ratio, the large upsetting deformation in the height direction during multi-directional die forging causes some metal to flow out of the cavity during mold closing. This results in fan-shaped transverse flash at the horizontal parting surface and longitudinal flash distributed upwards along the vertical cavity. Once flash forms at the parting surface, wear at the mold cavity parting surface intensifies. The transverse flash gradually thickens and enlarges with increasing production volume, leading to more severe wear and frequent repairs. The longitudinal flash on the vertical cavity is detrimental to punch wear and forging demolding. Furthermore, the formation of both types of flash requires an additional forging grinding process, which undermines the continuous flow advantage of multi-directional die forging, reduces production efficiency, and increases costs. Summary of the Invention

[0003] The present invention aims to solve the above-mentioned technical problems, thereby providing a multi-directional die forging forming mold and forming method for three-way valve body forgings, solving the problems of flash on the parting surface and flash in the vertical cavity, and improving the forming quality and production efficiency of forgings.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows:

[0005] A multi-directional forging die for a three-way valve body includes a lower die sleeve, an upper die sleeve, a horizontal punch, and a vertical punch. The lower die sleeve and upper die sleeve each contain a lower die core and an upper die core, respectively. The lower die core has a lower top block. The vertical punch penetrates the upper die sleeve. A beam pad is installed on the upper part of the upper die sleeve. A pressure block is inserted into the upper part of the upper die core. The pressure block has a through hole and a flange structure at its upper end. A pressure ring is located at the top of the flange structure and is positioned below the beam pad. The vertical punch sequentially penetrates the beam pad, the pressure ring, and the pressure block. Two adjusting semi-rings are symmetrically arranged between the lower and upper die cores, and two horizontal punches penetrate the two adjusting semi-rings respectively.

[0006] A forming method for a multi-directional die forging mold of a three-way valve body forging includes the following steps:

[0007] S1, Mold Installation

[0008] S2, billet heating and mold preheating

[0009] S3. The billet is removed from the furnace and placed into the lower mold core;

[0010] S4, Forging

[0011] 1) First upsetting of billet

[0012] As the upper mold sleeve moves downward, the billet lifts up the pressure block and pressure ring, and then the beam pad, pressure ring, and pressure block press down on the billet to perform the first upsetting of the billet;

[0013] 2) Pre-piercing with vertical punch

[0014] The upper die sleeve stops at the designated position, and the vertical punch descends to pre-pierce the blank;

[0015] 3) Second upsetting of billet

[0016] After the vertical punch completes the pre-piercing, it stops at the piercing position and moves downward to drive the pressure ring and pressure block to perform a second rough upsetting on the billet. The lower surface of the upper die core is in complete contact with the upper surface of the lower die core. The second upsetting ends when the upper and lower die sleeves are closed.

[0017] 4) Second piercing with vertical punch

[0018] After the upper and lower mold sleeves are closed, the vertical punch moves downward to perform a second piercing, and the stepped surface of the vertical punch contacts the top surface of the pressure block.

[0019] 5) Third piercing with vertical punch and third upsetting of billet

[0020] The vertical punch continues to descend to perform the third piercing, while simultaneously driving the pressure block to perform the third upsetting of the billet;

[0021] 6) Horizontal punch piercing

[0022] Two horizontal punches move in opposite directions to perform horizontal piercing, and the forging process ends when the piercing is completed.

[0023] S5. The upper mold sleeve moves upward, and the lower ejector block pushes out the formed three-way valve body.

[0024] Compared with the prior art, the present invention, which adopts the above technical solution, has the following beneficial effects:

[0025] Without adding functions to the multi-directional forging press or changing the shape and size of the forgings, this method completely avoids various flash problems that occur in the multi-directional forging production of T-shaped forgings, improves the forming quality and production efficiency of forgings, and extends the life of the die.

[0026] Furthermore, the optimized solution of the present invention is:

[0027] The lower part of the adjusting half-ring is embedded between the lower mold sleeve and the lower mold core.

[0028] When the lower mold sleeve and the upper mold sleeve are closed, the upper part of the adjustment half ring is inserted between the upper mold core and the upper mold sleeve.

[0029] The bottom surface of the flange structure of the pressure block is located on the top surface of the upper mold core. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the forming process of a multi-directional forging die according to an embodiment of the present invention;

[0031] Figure 2 This is a cross-sectional view of a tee forging according to an embodiment of the present invention;

[0032] Figure 3 for Figure 2 The right view;

[0033] Figure 4 This is a schematic diagram of the mold when the first billet upsetting is completed;

[0034] Figure 5 A schematic diagram of the die at the end of the pre-piercing of the vertical punch;

[0035] Figure 6 This is a schematic diagram of the mold used when the second upsetting of the billet is completed.

[0036] Figure 7 This is a schematic diagram of the mold when the vertical punch completes its second piercing.

[0037] Figure 8 This is a schematic diagram of the mold when the vertical punch completes the third piercing and the third upsetting of the blank.

[0038] In the figure: lower die sleeve 1; lower die core 2; blank 3; upper die core 4; upper die sleeve 5; pressure block 6; vertical punch 7; beam pad 8; pressure ring 9; adjusting half ring 10; horizontal punch 11; lower top block 12; valve body forging 13. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] See Figure 1 This embodiment is a multi-directional forging die for a three-way valve body, mainly composed of a lower die sleeve 1, a lower die core 2, an upper die core 4, an upper die sleeve 5, a vertical punch 7, and a horizontal punch 11. A lower center hole is opened at the bottom of the lower die sleeve 1, and the lower die core 2 is installed inside the lower die sleeve 1. The lower die core 2 has an ejection hole concentric with the lower center hole. A lower ejector block 12 is installed in the ejection hole and is connected to the lower ejector cylinder of the multi-directional forging press, which provides the ejection force to eject the valve body forging 13 out of the lower die core 2.

[0041] An upper die core 4 is installed inside the upper die sleeve 5. The upper die core 4 is a hollow structure. A central hole is opened at the top of the upper die sleeve 5. The upper die sleeve 5 is installed at the lower part of the beam pad 8. The upper die core 4, upper die sleeve 5, and beam pad 8 are connected in sequence to form the upper die. The beam pad 8 is connected to the moving beam of the multi-directional forging press, which provides the vertical clamping force. A pressure block 6 is inserted into the upper part of the upper die core 4. The pressure block 6 has a through hole and a flange structure at its upper end. The flange structure is located in the central hole of the upper die sleeve 5, and the bottom surface of the flange structure of the pressure block 6 is located on the top surface of the upper die core 4. A pressure ring 9 is provided at the top of the flange structure. The pressure ring 9 is located below the beam pad 8. A vertical punch 7 passes through the beam pad 8, pressure ring 9, and pressure block 6 in sequence. The vertical punch 7 is connected to the vertical piercing cylinder of the multi-directional forging press, which provides the vertical piercing force. The pressure block 6 works in conjunction with the pressure ring 9, the beam pad 8, and the vertical punch 7 to achieve upsetting deformation of the blank 3 during the mold closing and vertical piercing process.

[0042] Two adjusting semi-rings 10 are symmetrically arranged between the lower die core 2 and the upper die core 4. The axis of the adjusting semi-rings 10 is horizontally set, and its lower part is embedded between the lower die sleeve 1 and the lower die core 2. When the die is closed, the upper part of the adjusting semi-rings 10 is embedded between the upper die core 4 and the upper die sleeve 5. The adjusting semi-rings 10 are used to adjust the dimensions of the horizontal part of the valve body forging. Two horizontal punches 11 are respectively inserted into the two adjusting semi-rings 10. The horizontal punches 11 are connected to the horizontal cylinder of the multi-directional die forging press, which provides the horizontal piercing force.

[0043] A forming method for a multi-directional die forging mold for a three-way valve body, wherein the valve body is a 3-inch gate valve three-way valve body forging. Figure 2 , Figure 3 (As shown), proceed as follows:

[0044] S1, Mold Installation

[0045] The beam pad 8 is connected to the moving beam of the multi-directional forging press, the vertical punch 7 is connected to the vertical piercing cylinder of the multi-directional forging press, the horizontal punch 11 is connected to the horizontal cylinder of the multi-directional forging press, and the lower ejector block 12 is connected to the lower ejector cylinder of the multi-directional forging press.

[0046] S2, billet heating and mold preheating

[0047] The billet 3 is made of φ180×368mm round bar, heated to the initial forging temperature and held at that temperature, and the die is preheated to 200℃-300℃;

[0048] S3, billet unloading.

[0049] After the billet 3 is heated and the mold is preheated to the required temperature, the billet 3 is taken out of the furnace and placed into the lower mold core 2;

[0050] S4, Forging

[0051] 1) First upsetting of billet

[0052] As the upper die sleeve 5 moves downward, the blank 3 lifts the pressure block 6 and pressure ring 9, and then the beam pad 8 presses down the pressure ring 9 and pressure block 6. The beam pad 8, pressure ring 9, and pressure block 6 perform the first upsetting on the blank 3. At this time, the distance between the lower surface of the upper die core 4 and the upper surface of the lower die core 2 is required to be 20mm. Figure 4 (as shown)

[0053] 2) Pre-piercing with vertical punch

[0054] After the upper die sleeve 5 stops at the designated position, the vertical punch 7 descends to pre-pierce the blank 3, with a piercing depth of 24mm. Figure 5 (as shown)

[0055] 3) Second upsetting of billet

[0056] After the vertical punch 7 completes the pre-piercing, it stops at the piercing position. The upper die sleeve 5 moves downward, driving the pressure ring 9 and the pressure block 6 to perform a second rough upsetting on the blank 3. The lower surface of the upper die core 4 is in complete contact with the upper surface of the lower die core 2. The second upsetting ends when the upper die sleeve 5 and the lower die sleeve 1 close. Figure 6 (as shown)

[0057] 4) Second piercing with vertical punch

[0058] After the upper die sleeve 5 and the lower die sleeve 1 are closed, the vertical punch 7 moves downward to perform a second piercing to 30mm above the end position, and the stepped surface of the vertical punch 7 just contacts the top surface of the pressure block 6. Figure 7 (as shown)

[0059] 5) Third piercing with vertical punch and third upsetting of billet

[0060] The vertical punch 7 continues to descend 30mm for the third piercing, simultaneously driving the pressure block 6 for the third upsetting of the billet, with an upsetting stroke of 30mm. Figure 8 (as shown)

[0061] 6) Horizontal punch piercing

[0062] Two horizontal punches 11 move in opposite directions to perform horizontal piercing, and the forging process ends when the piercing is completed. Figure 1 (as shown)

[0063] S5, the upper die sleeve 5 moves upward, and the lower ejector block 12 ejects the formed three-way valve body forging 13.

[0064] The above description is merely a preferred embodiment of the present invention and does not limit the scope of the present invention. All equivalent structural changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A multi-directional forging die for a three-way valve body, comprising a lower die sleeve, an upper die sleeve, a horizontal punch, and a vertical punch, wherein a lower die core and an upper die core are respectively provided inside the lower die sleeve and the upper die sleeve, the lower die core is provided with a lower ejector block, the vertical punch penetrates through the upper die sleeve, and a beam pad is installed on the upper part of the upper die sleeve, characterized in that: The upper part of the upper mold core is fitted with a pressure block, which has a through hole and a flange structure at the upper end. The top of the flange structure is provided with a pressure ring, which is located below the beam pad. A vertical punch passes through the beam pad, the pressure ring, and the pressure block in sequence. Two adjusting half-rings are symmetrically arranged between the lower mold core and the upper mold core, and two horizontal punches pass through the two adjusting half-rings respectively. The lower part of the adjusting half-ring is embedded between the lower mold sleeve and the lower mold core. When the lower mold sleeve and the upper mold sleeve are closed, the upper part of the adjusting half-ring is embedded between the upper mold core and the upper mold sleeve. The forming method of the multi-directional die forging forming mold for the three-way valve body forging includes the following steps: S1, Mold Installation S2, billet heating and mold preheating S3. The billet is removed from the furnace and placed into the lower mold core; S4, Forging 1) First upsetting of billet As the upper mold sleeve moves downward, the billet lifts up the pressure block and pressure ring, and then the beam pad, pressure ring, and pressure block press down on the billet to perform the first upsetting of the billet; 2) Pre-piercing with vertical punch The upper die sleeve stops at the designated position, and the vertical punch moves downward to pre-pierce the blank; 3) Second upsetting of billet After the vertical punch completes the pre-piercing, it stops at the piercing position and moves downward to drive the pressure ring and pressure block to perform a second rough upsetting on the billet. The lower surface of the upper die core is in complete contact with the upper surface of the lower die core. The second upsetting ends when the upper and lower die sleeves are closed. 4) Second piercing with vertical punch After the upper and lower mold sleeves are closed, the vertical punch moves downward to perform a second piercing, and the stepped surface of the vertical punch contacts the top surface of the pressure block. 5) Third piercing with vertical punch and third upsetting of billet The vertical punch continues to descend to perform the third piercing, while simultaneously driving the pressure block to perform the third upsetting of the billet; 6) Horizontal punch piercing Two horizontal punches move in opposite directions to perform horizontal piercing, and the forging process ends when the piercing is completed. S5. The upper mold sleeve moves upward, and the lower ejector block pushes out the formed three-way valve body.

2. The multi-directional die forging mold for a three-way valve body as described in claim 1, characterized in that: The bottom surface of the flange structure of the pressure block is located on the top surface of the upper mold core.

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