A valve stem forging die

Abstract

The present invention discloses a valve stem forging die, which relates to the technical field of valve stem roughening, comprising an upper die plate and a lower die plate, wherein an upper die core is installed on the upper die plate, a pressure rod slides in the upper die core, and a lower die core is installed on the lower die plate, an upper pressure plate which can slide in an up-and-down direction is installed on the upper die plate, a lower pressure plate is installed on the upper surface of the lower die plate, N side sliders are provided between the upper die core and the lower die core, N≥2, and a groove is provided on the inner surface of the side slider in a horizontal direction, and the depth direction of the groove is consistent with the sliding direction of the side slider, and the side slider slides between the upper pressure plate through an inclined wedge, and a material receiving component is further provided between the upper die and the lower die. This valve stem forging die, by providing side sliders and grooves on the side sliders, produces a protrusion on the surface of the workpiece after roughening, and then after the die is opened, it is demoulded as a force point, thereby avoiding deformation of other positions of the workpiece due to force, and can also limit the demoulding sequence, and avoid the risk of the workpiece falling and bumping from the upper die.

Description

Technical Field

[0001] The invention relates to the technical field of valve stem roughening, in particular to a valve stem roughening die. Background Art

[0002] As a key valve component, the valve stem's performance directly impacts its sealing, durability, and reliability. Operating in high-pressure, high-temperature, or corrosive environments, the valve stem must possess high mechanical strength, wear resistance, and corrosion resistance. To meet these requirements, the valve stem is typically formed at the end using a roughing process to increase its diameter and strength.

[0003] During the valve stem roughening process, the workpiece may adhere to the mold surface due to high temperature. Most existing molds are separated from the upper and lower molds, because the lower mold contact surface is larger, so the workpiece is in the lower mold cavity. However, in some special cases, such as

[0004] If the upper die adheres to the workpiece, the workpiece may detach from the lower die first, becoming stuck in the upper die and unable to escape from the upper die under the action of gravity and the pull of the lower die workpiece surface. If the upper die workpiece is in a critical state, there is a risk of the workpiece falling when it moves with the upper die, causing damage to the workpiece and the mold cavity. In addition, the workpiece surface is conveniently demolded by setting the draft angle, so there are no other stress points. During the demolding process, the main force is the contact surface, and the force is pulled between the upper and lower dies. When it is still in a high temperature state, it is prone to local deformation. To achieve this, either manual intervention is required to remove the workpiece from the upper die, or a robotic arm is set up to remove the workpiece. Because the loading process also requires a robotic arm (the workpiece is hot), if a robotic arm is used for both loading and unloading, it will result in a relatively long time to organize the individual workpieces. To this end, we propose a valve stem forging die. Summary of the Invention

[0005] The object of the present invention is to provide a valve stem upsetting die to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a valve stem forging die, comprising an upper die plate and a lower die plate, an upper die core being installed on the upper die plate, a pressure rod sliding in the upper die core, and a lower die core being installed on the lower die plate, an upper pressure plate which can slide in the up and down directions being installed on the upper die plate, a lower pressure plate being installed on the upper surface of the lower die plate, N side sliders being arranged between the upper die core and the lower die core, N≥2, the side sliders covering the side surfaces of the workpiece and being located at the stepped shaft of the final formed shape of the workpiece, a groove being provided on the inner surface of the side slider in the horizontal direction, the depth direction of the recessed groove being consistent with the sliding direction of the side slider, the side slider sliding between the upper pressure plate through an inclined wedge, the side sliders being divided into two groups, and being bounded by a horizontal line passing through the center of mass of the workpiece, the side core pulling distances of the two groups of side sliders being different, a material receiving assembly being further provided between the upper die and the lower die, the material receiving assembly being able to move toward the workpiece with the movement of the upper die,

[0007] Preferably, a push rod is provided in the side slider for elastic sliding along its core pulling direction, the end of the push rod is in contact with the workpiece, and the push rod is located in the center of the groove, and a magnet is provided in the side slider of the group with the smaller side core pulling distance among the two groups of different side core pulling distances, and the magnet is used to generate attraction on the workpiece.

[0008] Preferably, the number of the side sliding blocks is , and they are evenly distributed on the outer peripheral surface of the workpiece, wherein magnets are provided at the ends of two adjacent push rods.

[0009] Preferably, an annular rib is provided on the outer edge of the groove, and the annular rib generates an annular groove on the surface of the workpiece as a transition zone for deformation.

[0010] Preferably, the material receiving assembly includes a fixed rod, the end of the fixed rod is rotatably connected to a material receiving ring, the axis of the material receiving ring is inclined toward the workpiece, and the fixed rod moves upward along the axial direction of the material receiving ring when the upper mold moves upward. During the upward movement of the workpiece, the material receiving ring is sleeved onto the workpiece and the workpiece is separated from the side slider and the push rod. After the workpiece enters the material receiving ring, the material receiving ring is rotated under the action of gravity, and the end of the workpiece tilts downward and slides out.

[0011] Preferably, the projection of the axis of the receiving ring on the end face of the fixed rod and the projection of the vertical line on the face have an angle α, and a torsion spring is elastically arranged between the receiving ring and the fixed rod. After the workpiece enters the receiving ring, it tilts and rotates, and the rotation angle is β, α+β>90°.

[0012] Preferably, the outer edge of the end of the push rod is a sloped surface or an arc surface.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention provides a side slider and a groove on the side slider. The groove is protruded on the surface of the workpiece after the workpiece is roughened, and then serves as a force point for demoulding after the mold is opened, thereby preventing deformation of other parts of the workpiece due to force, and also limiting the demoulding order to avoid the risk of the workpiece falling and bumping from the upper mold.

[0015] The present invention provides a receiving ring on the side of the mold. The receiving ring moves to the lower end of the workpiece after the upper mold moves, and is sleeved on the workpiece, so that the workpiece and the mold are completely separated. There is no collision in the entire process, and the material unloading is stable. Moreover, because the workpiece is inclined, it rotates after entering the receiving ring, that is, it is not in the cavity position, and the loading process of the next workpiece is not delayed, thereby improving the overall efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 for Figure 1 A magnified schematic diagram of the structure of area A;

[0018] Figure 3 It is a schematic diagram of the half-section state of the side slider and the position of the material receiving ring;

[0019] Figure 4 for Figure 3 A magnified schematic diagram of the structure of the middle B area;

[0020] Figure 5 Schematic diagram of the inclined wedge structure;

[0021] Figure 6 The figure is a schematic diagram of the inclination angle and motion trajectory of the workpiece and the material receiving ring in the initial state;

[0022] Figure 7 Schematic diagram of various angles between the connecting ring and the end face of the fixed rod;

[0023] Figure 8 Schematic diagram of the push rod end.

[0024] In the figure: 1-upper template; 2-lower template; 3-upper mold core; 4-pressing rod; 5-lower mold core; 6-upper pressure plate; 7-side slider; 8-groove; 9-wedge; 10-material receiving assembly; 11-push rod; 12-magnet; 13-annular rib; 14-annular groove; 101-fixing rod; 102-material receiving ring. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The present invention provides a technical solution: a valve stem forging die, comprising an upper die plate 1, an upper die core 3, an upper pressure plate 6 and a pressure rod 4 installed on an upper die. The pressure rod 4 moves up and down with the press to apply pressure. There are other common parts of the die between the upper die plate 1 and the press, which are not shown. The upper die core 3 and the upper die plate 1 move up and down with the upper working surface of the press to open and close the die. The lower die plate 2 is set on the lower table of the press, and other common parts of the die between the lower die plate 2 and the lower die plate 2 are not shown. The workpiece shown in the figure is the final formed workpiece. The inner walls of the upper die core 3 and the lower die core 5 are both provided with draft angles.

[0027] Side slider 7 Figure 1 and Figure 5 As shown, it is slidably installed on the upper pressure plate 6 by an inclined wedge 9, and a first spring is provided between the upper pressure plate 6 and the upper template 1, and a second spring is provided between the upper pressure plate 6 and the side slider 7. The side slider 7 requires side core pulling, so a sliding sleeve is provided at the contact end of the second spring to maintain the stability of the second spring. This structure is a conventional setting in the mold, so it is not shown, and the elastic coefficient of the second spring is much smaller than the first spring, so as to facilitate the realization of the action sequence. A lower pressure plate is installed on the upper surface of the lower template 2, and a third spring is provided between the lower pressure plate and the lower template 2. The elastic coefficient of the third spring is between the first spring and the second spring;

[0028] The number N of side sliders 7 is at least two, preferably three or four. Since the side sliders 7 need to be provided with springs and wedges 9 and other structures, they cannot be too small. Therefore, the more the number, the smaller the side sliders 7. The optimal number is three, and the following uses three as an example. Figure 3 As shown, three side sliders 7 wrap the workpiece, and a groove 8 is provided on the inner surface of the side slider 7, i.e., the side in contact with the workpiece. The groove 8 can form a protrusion on the surface of the workpiece after the workpiece is initially pressed and roughened. The protrusion can serve as a force point to separate the workpiece from the upper die when the upper die is opened, thereby preventing it from getting stuck in the upper die.

[0029] like Figure 4 As shown, the depth direction of the groove 8 is the horizontal moving core pulling direction of the side slider 7, that is, the two ends of the symmetrical center line of the side slider 7. Figure 3In the case shown, the moving distance of the side core pulling of any two side slides 7 is the same and smaller than the other one, so as to form an isosceles triangle support structure to support the workpiece, and at the same time cause the workpiece to be inclined. The material receiving assembly 10 is used to receive the workpiece and is linked with the movement of the upper mold during the mold opening process. For example, an inclined material guide plate is used. The material guide plate is located outside the mold. When the upper mold moves, the material guide plate can move below the workpiece. As the mold opening continues, the spacing between the side slides 7 increases, and the workpiece falls onto the material guide plate. The inclined state of the material guide plate can be set to be close to the axis of the inclined state of the workpiece, and the final spacing between the two is very small. This method avoids large surface damage when the workpiece falls. The material guide plate can also be set in a horizontal state at a higher position and slide horizontally. It only needs to be in the final state below the state where the workpiece is about to fall and close to the workpiece. When there are four side slides 7, they are divided into two groups, and two adjacent ones are classified as one group;

[0030] Because the valve stem is mostly a regular shaft-like part, its center of mass is on its axis or center line. Different groups of side sliders 7 are arranged with the center of mass as the boundary, which can facilitate the rapid tilting of the workpiece.

[0031] The lower die is also provided with a push rod, which is located directly below the workpiece to facilitate demoulding of the workpiece from the lower die;

[0032] Specifically, when the mold is in the open state, the heated workpiece blank is placed in the lower mold and positioned, and then under the action of the press, the pressure rod 4 and the upper mold are pressed down. After the upper mold and the lower mold are in contact, the cavity is in a semi-closed state, and then the pressure rod 4 begins to press the workpiece blank from top to bottom to roughen it. Because the inner surface of the side slider 7 is provided with a groove 8, a bulge will be formed on the surface of the workpiece. After the workpiece is formed, the upper mold and the pressure rod 4 move up. At this time, due to the action of the first spring, the upper pressure plate 6 will still be pressed on the side slider 7, and the upper mold core 3 and the workpiece are separated. In the separation process, the bulge on the workpiece will serve as a force point to pull the workpiece out of the upper mold, and because the bulge is small, it is in the force state. The micro-deformation is also concentrated in this area, which will be processed and removed later to avoid deformation of other parts of the workpiece, which will require an increase in the amount of cutting. The upper die continues to move up, and the third spring begins to recover, causing the lower pressure plate to move up. Because the main function of the lower pressure plate is to make the workpiece fall off the lower die core 5, only a short stroke is required. A large stroke can also be set according to the length of the workpiece to make the workpiece completely separate from the lower die. Similarly, the force-bearing position is still the protrusion on the workpiece. When the second spring returns to its natural state or reaches the limit state, the upper pressure plate 6 moves with the upper die, and under the action of the second spring and the wedge 9, the side slider 7 slides radially outward along the workpiece in the water surface, as shown in FIG. Figure 5 As shown, because the inclination angles of the wedges 9 of the two sets of side sliders 7 are different, the following will occur: Figure 6In the situation shown, the workpiece is tilted, and as the upper mold continues to move upward, the material receiving assembly 10 touches the lower end of the workpiece, causing the workpiece to temporarily return to the center and slide off the middle of the side slider 7. When resetting, each structure is reset in reverse order according to the mold opening sequence.

[0033] See Figure 1 、 Figure 3 、 Figure 4 and Figure 6 , there is uncertainty in blanking by relying solely on the above structure, so a push rod 11 is set in the side slider 7, that is, a step groove is opened on the outer surface of the side slider 7, so that the step groove puts the push rod 11 in and seals the outer end surface, and a fourth spring is provided at one end of the push rod 11 located inside the side slider 7. The fourth spring can pop out when the side slider 7 is in the open state, thereby forming a workpiece surface as shown in FIG. Figure 6 Point support state, because in the point support state, the workpiece can return to the center under the action of its own gravity. Therefore, a magnet 12 is fixed at the end of the push rod 11 in the side slider 7 of a group with a small side core pulling distance, and the magnet 12 then generates attraction at the outer end of the push rod 11, thereby sucking the workpiece and causing the workpiece to tilt. The push rod 11 in the other group of side sliders 7 forms a side support. The size of the attraction and the balance of the three-point support state are balanced with the gravity of the workpiece itself, so that the workpiece will not fall automatically. After the workpiece area is straightened under the action of the material receiving component 10, it loses the support of the third point and falls onto the material receiving component 10 under the action of gravity.

[0034] See Figure 3 and Figure 6 The specific embodiment of the material receiving assembly 10 is composed of a fixed rod 101 and a material receiving ring 102. The fixed rod 101 is installed on the lower mold and is linked with the upper mold. It can move with the movement of the upper mold. The specific moving direction is as follows: Figure 6 As shown in the state, the material receiving ring 102 moves upward along the axial direction, and the axial direction of the material receiving ring 102 is parallel or approximately parallel to the axial direction of the workpiece in the tilted state under the action of the push rod 11. As the two move along their respective predetermined directions, the material receiving ring 102 can be sleeved on the lower end of the workpiece, and as the movement continues, the lower end of the workpiece will move to the right, and the left side of the upper end of the workpiece (here left and right are both Figure 6 The workpiece is completely separated from the upper and lower molds and the side slide 7 by the material receiving ring 102. The diameter of the material receiving ring 102 is smaller than the maximum diameter of the roughened part and larger than the diameter of other parts, so that the workpiece can be put on more easily. Compared with the use of a guide plate, the material receiving ring 102 can completely prevent the workpiece from bumping.

[0035] Furthermore, the inner diameter of the receiving ring 102 is smaller than the outer diameter of the workpiece at the center of mass, so that the workpiece forms a top-heavy state on the receiving ring 102. The outer wall of the receiving ring 102 is rotatably connected to the fixed rod 101, and then tilts under the action of the workpiece's own weight, and then slides toward the guide plate, which can prevent the workpiece from being bumped as a whole and ensure stable material unloading.

[0036] See Figure 7 The angle between the projection line of the axis of the receiving ring 102 on the end face of the fixed rod 101 and the projection line of the vertical direction on the end face of the fixed rod 101 is α, α>0°, and is preferably 2°, 3° or 4°. This angle is set to prevent the workpiece from reaching a vertical stable state under accidental circumstances, that is, the center of mass is located directly above the vertical direction of the axis of the fixed rod 101, so that it cannot tilt and slide out. The rotation angle β of the receiving ring 102 needs to make the workpiece reach a horizontal downward tilt state after rotation, so α+β needs to be greater than 90° to make the workpiece tilt and slide out. A torsion spring is set between the receiving ring 102 and the fixed rod 101, which is mainly used for reset, and at the same time it can prevent the workpiece from rotating rapidly during the rotation process, which can play a certain deceleration role, thereby stabilizing the unloading.

[0037] See Figure 2 , corresponding to the annular groove 14, an annular rib 13 is provided at the edge of the groove 8. The annular groove 14 generated can make the workpiece produce local deformation at the edge during the demolding process because the main force point is concentrated on the bulge generated by the groove 8. Especially in the just-opened mold state, because the heat cannot dissipate quickly, the workpiece is still in a high temperature state and is easy to deform. Therefore, the annular groove 14 serves as a deformation buffer transition zone to prevent deformation at other positions;

[0038] Furthermore, ribs or grooves distributed radially along the outer edge of the annular rib 13 can be provided on the outer edge of the annular rib 13, such as Figure 2 The grooves or ribs shown in FIG. 1 also serve to strengthen the structural stability.

[0039] like Figure 8 As shown, the outer edge of the end of the push rod 11 is a bevel or arc surface to avoid scratches on the surface of the workpiece during sliding.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A valve stem forging die, comprising an upper die plate (1) and a lower die plate (2), wherein an upper die core (3) is mounted on the upper die plate (1), a pressure rod (4) slides in the upper die core (3), and a lower die core (5) is mounted on the lower die plate (2), characterized in that: The upper mold plate (1) is provided with an upper pressing plate (6) that can slide in the up-down direction, and the upper surface of the lower mold plate (2) is provided with a lower pressing plate. N side sliders (7) are provided between the upper mold core (3) and the lower mold core (5), N≥2. The side sliders (7) cover the side surface of the workpiece and are located at the stepped axis of the final formed shape of the workpiece. The inner surface of the side slider (7) is provided with a groove (8) along the horizontal direction. The depth direction of the groove (8) is consistent with the sliding direction of the side slider (7). The side slider (7) slides between the upper pressing plate (6) through the inclined wedge (9). The side sliders (7) are divided into two groups, and the horizontal line passing through the center of mass of the workpiece is used as a boundary. The side core pulling distances of the two groups of side sliders (7) are different. A material receiving assembly (10) is also provided between the upper mold and the lower mold. The material receiving assembly (10) can move toward the workpiece as the upper mold moves. After the side slider (7) side core pulling, the workpiece tilts and then falls into the material receiving assembly (10).

2. The valve stem forging die according to claim 1, characterized in that: A push rod (11) is elastically slidably provided in the side slider (7) along its core pulling direction, the end of the push rod (11) contacts the workpiece, and the push rod (11) is located at the center of the groove (8). A magnet (12) is provided in the side slider (7) of the group with the smaller side core pulling distance among the two groups with different side core pulling distances, and the magnet (12) is used to generate an attractive force on the workpiece.

3. The valve stem forging die according to claim 2, characterized in that: The number of the side sliding blocks (7) is three and they are evenly distributed on the outer peripheral surface of the workpiece, wherein magnets (12) are provided at the ends of two adjacent push rods (11).

4. The valve stem forging die according to claim 1, characterized in that: An annular convex rib (13) is provided in the outer edge region of the groove (8), and the annular convex rib (13) generates an annular groove (14) on the surface of the workpiece as a transition zone for deformation.

5. The valve stem forging die according to claim 2 or 3, characterized in that: The material receiving assembly (10) comprises a fixed rod (101), the end of which is rotatably connected to a material receiving ring (102), the axis of which is inclined toward the workpiece, and the fixed rod (101) moves upward along the axial direction of the material receiving ring (102) when the upper die moves upward, and during the upward movement of the workpiece, the material receiving ring (102) is sleeved onto the workpiece and causes the workpiece to separate from the side slider (7) and the push rod (11), and after the workpiece enters the material receiving ring (102), the material receiving ring (102) rotates under the action of gravity, and the end of the workpiece tilts downward and slides out.

6. The valve stem forging die according to claim 5, characterized in that: The projection of the axis of the receiving ring (102) on the end face of the fixed rod (101) and the projection of the vertical line on the end face have an included angle α, and a torsion spring is elastically arranged between the receiving ring (102) and the fixed rod (101). After the workpiece enters the receiving ring (102), it tilts and rotates, and the rotation angle is β, and α+β>90°.

7. The valve stem forging die according to claim 2, characterized in that: The outer edge of the end of the push rod (11) is an inclined surface or an arc surface.

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