Center alignment device for large tungsten alloy pressed blank

Abstract

The utility model belongs to the technical field of tungsten alloy processing, and relates to a center alignment device for a large tungsten alloy compact, which comprises a tray, a mandrel, a support ring, a pressing plate and a rolling body, the tray is disc-shaped, the mandrel is cylindrical, the bottom of the tray is fixedly connected with the top of the mandrel in the axial direction, the supporting ring is cylindrical, and the inner diameter of the supporting ring is larger than the outer diameter of the mandrel. A plurality of rolling bodies are arranged at the top of the supporting ring, the supporting parts of the rolling bodies are connected with the upper surface of the supporting ring, and the rolling parts of the rolling bodies support the bottom surface of the supporting tray from bottom to top; the mandrel extends into a cylindrical inner hole of the supporting ring, at least four springs are arranged in the supporting ring in the radial direction, the springs stretch out and draw back in the radial direction, and the two ends of the springs abut against the outer circumference of the mandrel and the inner hole wall of the supporting ring respectively. The utility model solves the problems that the alignment is time-consuming and labor-consuming, the compact is easy to damage and the like due to large dead weight and hard and brittle texture of a large tungsten alloy compact.

Description

Technical Field

[0001] The utility model belongs to the technical field of tungsten alloy processing and relates to a center alignment device for large tungsten alloy pressed blanks. Background Art

[0002] Large tungsten alloy compacts are typically produced using cold isostatic pressing. One of the drawbacks of cold isostatic pressing is its poor dimensional accuracy. Due to the high cost of tungsten alloy raw materials, trimming is often required to achieve the desired shape and dimensional accuracy to improve material utilization. Before trimming the tungsten alloy compact, a rubber or silicone pad is placed in the center of a four-jaw single-action chuck. The compact is then positioned roughly in the center of the vertical four-jaw chuck. The lead screw is rotated to move the jaws forward or backward, pushing or releasing the compact for alignment and processing.

[0003] However, since large tungsten alloy blanks are heavy and hard and brittle, the friction between the blanks and the rubber pads is large when the blanks are aligned, resulting in large resistance when the jaws push the blanks, making the operation difficult. At the same time, the strong squeezing of the jaws can easily cause the blanks to crack or even break and fall off, resulting in waste.

[0004] Therefore, a centering device or method for large tungsten alloy compacts is needed to solve this problem. Summary of the Invention

[0005] The technical solution adopted by the utility model to solve the technical problem is: a centering device for large tungsten alloy compacts, comprising: a tray, a core shaft, and a support ring; the tray is disc-shaped, the core shaft is cylindrical, the bottom of the tray is fixedly connected to the top of the core shaft along the axial direction, and the tray and the core shaft are connected as a whole; the support ring is cylindrical, and the inner hole diameter of the support ring is larger than the outer diameter of the core shaft; a plurality of rolling bodies are provided on the top of the support ring, the supporting parts of the rolling bodies are connected to the upper surface of the support ring, the rolling parts of the rolling bodies extend from the bottom to the top of the upper surface of the support ring, and the rolling parts of the rolling bodies support the bottom surface of the tray from the bottom to the top;

[0006] The core shaft extends from top to bottom into the cylindrical inner hole of the support ring. At least four groups of springs are provided on the circumference of the cylindrical inner hole of the support ring. The expansion and contraction direction of the spring is radial. The two ends of the spring are fixed by the blind hole on the core shaft and the corresponding top screws on the support ring respectively. When aligning, the blank is placed on the upper surface of the tray from top to bottom, and the claws are rotated radially to push the outer cylindrical surface of the blank. As the blank moves, the core shaft is horizontally offset relative to the support ring to align the center of the blank.

[0007] Preferably, a rubber pad is provided on the upper surface of the tray.

[0008] Preferably, the core shaft is cylindrical, and blind holes are evenly distributed along the radial direction on the cylindrical surface of the core shaft, and the inner end of the spring is tightly pressed into the blind hole of the core shaft.

[0009] More preferably, a radially retractable top screw is provided on the inner hole wall of the support ring, and the inner end of the top screw presses the outer end of the spring; the outer circumference of the top screw is threadedly connected to the screw hole of the support ring, the screw hole connects the inner and outer circumferential walls of the support ring, and the outer end of the top screw is retracted into the screw hole on the outer circumference of the support ring.

[0010] More preferably, the springs and rolling bodies are provided in five to ten groups respectively, and the springs and rolling bodies are evenly distributed around the core shaft in a horizontal plane.

[0011] More preferably, the horizontal arrangement position of the spring and the horizontal arrangement position of the rolling body are arranged alternately.

[0012] Preferably, the bottom of the tray and the top of the core shaft are connected by welding, riveting or bolting.

[0013] Preferably, the inner hole of the support ring is in the shape of a stepped hole that is small at the top and large at the bottom, and a disc-shaped pressure plate is detachably connected to the bottom of the core shaft. The radial size of the pressure plate is larger than the radial size of the small hole of the step inner hole of the support ring, the radial size of the pressure plate is smaller than the radial size of the large hole of the step inner hole of the support ring, and the thickness of the pressure plate is smaller than the depth of the large hole of the step inner hole of the support ring.

[0014] Preferably, the rolling element includes a universal ball.

[0015] The beneficial effects of the utility model are:

[0016] The utility model can realize the center alignment of 400kg-1200kg tungsten alloy compacts, has the functions of easy compact movement, short compact center alignment time, not easy compact damage, and automatic return of the tray to the chuck center, and effectively solves the problems encountered in the trimming of large tungsten alloy compacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a top view schematic diagram of a center alignment device for large tungsten alloy compacts according to the present invention;

[0018] Figure 2 For this utility model Figure 1 AA section view;

[0019] Figure 3 It is a side view schematic diagram of the utility model;

[0020] Figure 4 For this utility model Figure 3 Schematic diagram of the explosion decomposition.

[0021] In the figure, 1, pressed blank; 2, rubber pad; 3, tray; 4, core shaft; 5, spring; 6, claw; 7, support ring; 8, pressure plate; 9, top screw; 10, rolling element. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the relevant technologies in the present invention. Obviously, the embodiments described 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.

[0023] refer to Figures 1 to 4 As shown, a centering device for a large tungsten alloy compact according to this embodiment includes: a tray 3, a core shaft 4, and a support ring 7;

[0024] The tray 3 is disc-shaped, and the mandrel 4 is cylindrical. The bottom of the tray 3 is fixedly connected to the top of the mandrel 4 along the axial direction. The tray 3 and the mandrel 4 are fixed together and used to align the green compact 1. The tray 3 carries the green compact 1, and the mandrel 4 is subjected to force to adjust the position of the tray 3 and the green compact 1 when the tray 3 and the green compact 1 move together.

[0025] The support ring 7 is cylindrical, and the inner hole diameter of the support ring 7 is larger than the outer diameter of the core shaft 4; a plurality of rolling bodies 10 are provided on the top of the support ring 7, and the supporting parts of the rolling bodies 10 are connected to the upper surface of the support ring 7, and the rolling parts of the rolling bodies 10 extend from the upper surface of the support ring 7 from bottom to top, and the rolling parts of the rolling bodies 10 lift the bottom surface of the support tray 3 from bottom to top; the support tray 3 is used to support the weight of the green compact 1, and at the same time, during the alignment process of the tray 3 and the green compact 1, the sliding friction between the tray 3 and the green compact 1 and the upper surface of the support ring 7 when they move together is converted into rolling friction through the rolling bodies 10, making the alignment more labor-saving and less likely to damage the outer side wall of the green compact 1 that bears the force;

[0026] The core shaft 4 extends from top to bottom into the cylindrical inner hole of the support ring 7. At least four groups of springs 5 are provided around the circumference of the cylindrical inner hole of the support ring 7. The expansion and contraction direction of the spring 5 is radial. The two ends of the spring 5 are respectively fixed by the blind hole of the core shaft 4 and the inner hole of the support ring 7. The compression length thereof is adjusted by the top screw 9. The spring 5 is used to maintain an equal gap between the core shaft 4 and the support ring 7, so that the gap can be adjusted conveniently when the green compact 1 is aligned. Moreover, when the green compact 1 is separated from the tray 3, the tray 3 and the core shaft 4 can return to their initial positions.

[0027] During alignment, the green sheet 1 is placed from top to bottom on the upper surface of the tray 3, and the claws 6 are rotated radially to push the outer cylindrical surface of the green sheet 1. As the green sheet 1 moves, the core shaft 4 is horizontally offset relative to the support ring 7 to align the center of the green sheet 1.

[0028] Furthermore, a rubber pad 2 is provided on the upper surface of the tray 3 ; the rubber pad 2 is used to mitigate the impact when the green compact 1 is placed, and prevent the edges and corners of the green compact 1 from being damaged.

[0029] Furthermore, the core shaft 4 is cylindrical, and blind holes are evenly distributed radially on the cylindrical surface of the core shaft 4. The inner end of the spring 5 is tightly pressed into the blind hole of the core shaft 4; the outer end of the spring 5 is installed in the threaded through hole in the support ring, and its length is adjusted by the top screw 9.

[0030] Furthermore, a radially adjustable top screw 9 is provided on the inner hole wall of the support ring 7, and the inner end of the top screw 9 presses the outer end of the spring 5; the outer circumference of the top screw 9 is threadedly connected to the outer hole wall of the support ring 7, and the outer end of the top screw 9 is lower than the outer circumference of the support ring 7; ensuring that the support ring is installed into the four-jaw chuck without collision.

[0031] Furthermore, the springs 5 and rolling bodies 10 are respectively provided in five to ten groups, and the springs 5 and rolling bodies 10 are respectively evenly distributed around the core shaft 4 in the horizontal plane; the number of springs 5 and rolling bodies 10 is selected according to the size of the compact 1 that needs to be aligned, and the springs 5 and rolling bodies 10 are evenly distributed around the circumference to provide better upward supporting force and radial alignment adjustment force.

[0032] Furthermore, the horizontal arrangement position of the spring 5 and the horizontal arrangement position of the rolling body 10 are arranged in an alternating manner.

[0033] Furthermore, the connection method between the bottom of the tray 3 and the top of the core shaft 4 includes: welding, riveting or bolting.

[0034] Furthermore, the inner hole of the support ring 7 is in the shape of a stepped hole that is small at the top and large at the bottom. A detachable disc-shaped pressure plate 8 is provided at the bottom of the core shaft 4. The radial dimension of the pressure plate 8 is larger than the radial dimension of the small hole of the stepped inner hole of the support ring 7, and the radial dimension of the pressure plate 8 is smaller than the radial dimension of the large hole of the stepped inner hole of the support ring 7. The thickness of the pressure plate 8 is smaller than the depth of the large hole of the stepped inner hole of the support ring 7. The pressure plate 8 is located in the large hole of the stepped inner hole of the support ring 7, and the bottom surface of the pressure plate 8 does not contact the external bottom surface, thereby reducing the external friction force when the core shaft 4 is aligned. At the same time, the pressure plate 8 is larger than the small hole of the stepped inner hole of the support ring 7, so that the core shaft 4 will not fall out of the inner hole of the support ring 7 during the alignment process, thereby preventing the occurrence of overturning of the compact 1, tray 3 and core shaft 4 due to the excessive weight of the compact 1.

[0035] Furthermore, the rolling body 10 includes: universal balls, cylindrical rollers, and needle rollers; universal balls are a better support method, but since the top contact area of spherical rollers is small, the load-bearing capacity is poor, and the top contact area of cylindrical rollers is large, the load-bearing capacity is strong, which is suitable for heavier compacts 1, but the rolling direction of cylindrical rollers is limited, and they are generally set to roll radially, so their mobility is weaker than that of universal balls. You can choose to use universal balls or cylindrical rollers based on the actual situation on site.

[0036] Example

[0037] In this embodiment, a large tungsten alloy compact 1 is placed on a tray 3. Six steel rolling elements 10 are mounted below the tray 3. In this embodiment, the rolling elements 10 are universal ball joints. This replaces sliding friction between the compact 1 and the chuck surface with rolling friction, reducing friction during compact 1 movement. The tray 3 is initially fixed at the exact center of the chuck. A margin of adjustment of at least 20 mm is reserved between the tray 3 and the support ring 7. Six compression springs 5 connect the two, allowing the tray 3 to move in any direction. Since the compact 1 is placed on the tray 3, the large compact 1 can be moved in any direction during alignment by adjusting the advance and retreat of the clamping jaws 6.

[0038] The specific working principle is as follows: During loading, a large tungsten alloy compact 1 is placed roughly at the center of a tray 3, with a rubber pad 2 placed in the middle as a cushion. The compact 1 is then displaced by rotating the jaws 6 in or out, pushing or releasing them, and the center of the compact is then aligned. The amount of adjustment is determined by the clearance between the core shaft 4, the support ring 7, and the pressure plate 8. Because the universal ball can withstand large loads and can roll in any direction, the compact can be easily moved. The initial position of the tray center is at the center of the chuck, ensuring that the compact has the same offset when moving in any direction. A compression spring 5 is used to connect the tray 3 and the support ring 7. When the compact 1 is released from the tray 3, the spring 5 returns the tray 3 to its initial position.

[0039] This embodiment uses universal ball transfers as load-bearing components, transforming sliding friction into rolling friction, significantly reducing friction during compact movement, reducing operator workload, and improving compact alignment efficiency. The universal ball transfers can roll in any direction, ensuring compact alignment, reducing operator pressure to precisely center the compact during loading, and facilitating operation. This embodiment also uses springs as connectors between the tray and support ring, enabling the tray to automatically return to its center position.

[0040] In summary, the utility model can realize the center alignment of large tungsten alloy blanks weighing 400kg-1200kg, has the functions of easy movement of the blanks, short time for center alignment of the blanks, not easy damage to the blanks, and automatic return of the tray to the center of the chuck, thereby solving the problems of time-consuming and labor-intensive alignment and easy damage to the blanks caused by the heavy weight, hardness and brittleness of large tungsten alloy blanks.

[0041] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A centering device for large tungsten alloy compacts, characterized in that: include: Tray (3), core shaft (4), support ring (7); The tray (3) is disc-shaped, the core shaft (4) is cylindrical, the bottom of the tray (3) is fixedly connected to the top of the core shaft (4) along the axial direction, and the tray (3) and the core shaft (4) rotate on the same axis; The support ring (7) is cylindrical, and the inner hole diameter of the support ring (7) is larger than the outer diameter of the core shaft (4); a plurality of rolling bodies (10) are provided on the top of the support ring (7), and the supporting parts of the rolling bodies (10) are connected to the upper surface of the support ring (7), and the rolling parts of the rolling bodies (10) extend from the bottom to the top of the upper surface of the support ring (7), and the rolling parts of the rolling bodies (10) lift and support the bottom surface of the tray (3) from the bottom to the top; The core shaft (4) extends downward into the cylindrical inner hole of the support ring (7), and at least four groups of springs (5) are provided on the circumference of the cylindrical inner hole of the support ring (7). The expansion and contraction direction of the springs (5) is radial expansion and contraction, and the two ends of the springs (5) respectively press against the outer circumference of the core shaft (4) and the inner hole wall of the support ring (7); During alignment, the green sheet (1) is placed from top to bottom on the upper surface of the tray (3), the claws (6) are rotated radially to push the outer cylindrical surface of the green sheet (1), and the core shaft (4) is horizontally offset relative to the support ring (7) as the green sheet (1) moves, thereby aligning the center of the green sheet (1).

2. A centering device for large tungsten alloy compacts according to claim 1, characterized in that: A rubber pad (2) is provided on the upper surface of the tray (3).

3. A centering device for large tungsten alloy compact according to claim 1, characterized in that: The cylindrical surface of the core shaft (4) is provided with evenly distributed blind holes along the radial direction, and the inner end of the spring (5) is tightly pressed into the blind hole of the core shaft (4).

4. A centering device for large tungsten alloy compacts according to claim 3, characterized in that: A radially fixed top screw (9) is provided on the inner hole wall of the support ring (7), and the inner end of the top screw (9) presses against the outer end of the spring (5); the outer circumference of the top screw (9) is threadedly connected to the screw hole of the support ring (7), and the screw hole communicates with the inner and outer circumferential walls of the support ring (7), and the outer end of the top screw (9) is retracted into the screw hole.

5. A centering device for large tungsten alloy compact according to claim 4, characterized in that: The springs (5) and rolling bodies (10) are respectively provided in five to ten groups, and the springs (5) and rolling bodies (10) are respectively evenly distributed around the core shaft (4) in a horizontal plane.

6. A centering device for large tungsten alloy compacts according to claim 5, characterized in that: The horizontal arrangement position of the spring (5) and the horizontal arrangement position of the rolling body (10) are arranged in an interlaced manner.

7. A centering device for large tungsten alloy compacts according to claim 1, characterized in that: The connection method between the bottom of the tray (3) and the top of the core shaft (4) includes welding, riveting or bolt connection.

8. The centering device for large tungsten alloy compact according to claim 1, characterized in that: The inner hole of the support ring (7) is in the shape of a stepped hole that is smaller at the top and larger at the bottom. The bottom of the core shaft (4) is detachably connected to a disc-shaped pressing plate (8). The radial size of the pressing plate (8) is larger than the radial size of the small hole in the stepped hole of the support ring (7). The radial size of the pressing plate (8) is smaller than the radial size of the large hole in the stepped inner hole of the support ring (7). The thickness of the pressing plate (8) is smaller than the depth of the large hole in the stepped inner hole of the support ring (7).

9. The centering device for large tungsten alloy compact according to claim 1, characterized in that: The rolling body (10) includes a universal ball.

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