Molybdenum alloy punch with wear-resistant sheath structure

Abstract

This utility model relates to a molybdenum alloy mandrel with a wear-resistant sheath structure, including a sleeve, a molybdenum alloy mandrel, and a transmission clamping component. When storing the unused molybdenum alloy mandrel, the bottom of the mandrel is placed into the sleeve. Since the tops of the three clamping jaws have sloping surfaces, the molybdenum alloy mandrel moves downwards, squeezing the three clamping jaws away from each other until the bottom of the molybdenum alloy mandrel contacts and squeezes the base cover, causing the base cover to move downwards and squeeze the spring. At this time, the three transmission rods swing, causing the three clamping jaws to clamp the molybdenum alloy mandrel. The surface of the clamping jaws near the molybdenum alloy mandrel has an adhesive layer to protect the surface of the molybdenum alloy mandrel. Similarly, the sloping surfaces also have an adhesive layer. Protective cotton is provided on the top of the base cover to protect the bottom of the molybdenum alloy mandrel. The spring provides pre-tension force, achieving an initial clamping effect. By rotating the limiting nut, when the top of the limiting nut is in contact with the bottom of the sleeve, the column and the base cover cannot move upwards, and the three clamping jaws are locked, making the molybdenum alloy mandrel more securely fixed.

Description

Technical Field

[0001] This utility model relates to the field of molybdenum alloy mandrel technology, specifically a molybdenum alloy mandrel with a wear-resistant sheath structure. Background Technology

[0002] In industrial fields such as seamless steel pipe rolling and high-temperature alloy forging, molybdenum alloy mandrels have become core components to ensure forming accuracy due to their excellent high-temperature strength and corrosion resistance. To prevent damage to the mandrels from external impacts during transportation, storage, and non-working conditions, existing technologies mostly use sleeve-type protective sleeves for protection. By directly inserting the molybdenum alloy mandrel into the sleeve, the sleeve wall is used to achieve basic isolation and protection. However, existing sleeve-type protective sleeves only provide simple wrapping protection and do not design auxiliary fixing structures for the gap between the molybdenum alloy mandrel and the sleeve. Due to certain tolerances in the machining accuracy of the molybdenum alloy mandrel and the sleeve, a radial gap is easily formed after assembly. This causes the mandrel to be in a non-fixed state inside the sleeve. During actual transportation or carrying, when the sleeve is affected by external forces such as vibration and tilting, the molybdenum alloy mandrel inside will shake back and forth with the gap. The end and side wall of the mandrel will frequently collide and rub against the inner wall of the sleeve. This unrestrained shaking will not only cause wear on the surface of the molybdenum alloy mandrel and damage the precision forming surface of the mandrel, but also affect the product accuracy of subsequent rolling and forging processes. It cannot meet the actual needs of the industrial field for efficient protection of molybdenum alloy mandrels. Therefore, we need to provide a molybdenum alloy mandrel with a wear-resistant protective sleeve structure. Utility Model Content

[0003] The purpose of this utility model is to provide a molybdenum alloy mandrel with a wear-resistant sheath structure, which has a transmission clamping component inside the sleeve, enabling quick and easy auxiliary fixation of the molybdenum alloy mandrel, preventing the molybdenum alloy mandrel from wobbling back and forth inside the sleeve and causing wear, thus solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a molybdenum alloy mandrel with a wear-resistant sheath structure, comprising: The sleeve, the molybdenum alloy head, and the transmission clamping component are all installed inside the sleeve. The transmission clamping component is used to quickly limit and protect the molybdenum alloy head. The transmission clamping component includes jaws and a transmission component. Three evenly distributed jaws are slidably installed inside the sleeve. The transmission component is installed inside the sleeve to achieve synchronous closing of the three jaws to limit and clamp the molybdenum alloy head.

[0005] Preferably, the transmission component includes a base cover, a transmission rod, and a spring. Each of the three grippers has a push rod hinged to its bottom. One adjacent end of each of the three push rods is hinged to a groove on the surface of the base cover. A spring is installed between the top of the inner wall of the base cover and the bottom of the sleeve.

[0006] Preferably, a column is movably sleeved inside the spring, and the column is slidably mounted on the bottom of the sleeve, with the top of the column fixed to the top of the inner wall of the base cover.

[0007] Preferably, a limiting nut is threaded onto the surface of the cylinder, and the limiting nut is located at the bottom of the sleeve.

[0008] Preferably, a protective cap is threaded onto the top opening of the sleeve, and a protective cotton block is fixedly installed inside the top of the protective cap.

[0009] Preferably, the ends of the three gripper surfaces are slidably mounted inside the sleeve, and the top of the gripper is fixedly mounted with a ramp surface for guiding the molybdenum alloy head.

[0010] Preferably, an adhesive layer is provided on one side of the slope and on the surface of the three grippers, and a protective cotton is fixedly installed on the top of the base cover.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention features a transmission clamping component inside the sleeve, which can quickly and effectively fix the molybdenum alloy mandrel, preventing it from wobbling back and forth inside the sleeve and causing wear. Three evenly distributed jaws simultaneously approach, providing a stable clamping grip on the molybdenum alloy mandrel from multiple directions, tightly fitting the outer wall of the mandrel and effectively filling the radial gap between the mandrel and the sleeve. This prevents the mandrel from wobbling back and forth due to vibration or tilting during transport and storage, fundamentally reducing collision and friction between the mandrel and the inner wall of the sleeve, and protecting the precision-formed surface of the mandrel. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional sectional view of the sleeve of this utility model; Figure 3 This is a perspective view of the transmission component of this utility model; Figure 4 This is a partial three-dimensional view of the present invention.

[0013] In the diagram: 1. Sleeve; 2. Molybdenum alloy head; 3. Transmission clamping component; 31. Gripper; 32. Transmission component; 321. Base cover; 322. Transmission rod; 323. Spring; 4. Column; 5. Limit nut; 6. Protective cover; 7. Protective cotton block; 8. Sloping surface; 9. Adhesive layer; 10. Protective cotton. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-4 This utility model provides a technical solution: a molybdenum alloy mandrel with a wear-resistant sheath structure, comprising: Sleeve 1, molybdenum alloy head 2 and transmission clamping component 3 are installed inside sleeve 1. Transmission clamping component 3 is used to quickly limit and protect molybdenum alloy head 2. The transmission clamping component 3 includes a jaw 31 and a transmission component 32. Three evenly distributed jaws 31 are slidably installed inside the sleeve 1. The transmission component 32 is installed inside the sleeve 1 to realize the synchronous approach of the three jaws 31 to limit and clamp the molybdenum alloy head 2. Specifically, a transmission clamping component 3 is provided inside the sleeve 1, which can quickly and auxiliaryly fix the molybdenum alloy mandrel, preventing the molybdenum alloy mandrel from swaying back and forth inside the sleeve 1 and causing wear. Through the synchronous approach of three evenly distributed jaws 31, the molybdenum alloy mandrel can be stably clamped from multiple directions, closely fitting the outer wall of the mandrel, effectively filling the radial gap between the mandrel and the sleeve 1, and preventing the mandrel from swaying back and forth due to vibration and tilt during transportation and storage. This reduces the collision and friction between the mandrel and the inner wall of the sleeve 1 from the root, protecting the precision forming surface of the mandrel. With the linkage design of the transmission component 32 and the jaws 31, no complicated operation is required. Simply put the molybdenum alloy mandrel into the sleeve 1, and the jaws 31 will automatically and synchronously clamp it, realizing the rapid auxiliary fixation of the mandrel.

[0016] The transmission component 32 includes a base cover 321, a transmission rod 322 and a spring 323. The bottom of each of the three grippers 31 is hinged with a push rod. The adjacent ends of the three push rods are hinged to the grooves on the surface of the base cover 321. A spring 323 is installed between the top of the inner wall of the base cover 321 and the bottom of the sleeve 1. Furthermore, the base cover 321 of the transmission component 32 has a cylindrical structure. The bottom of the three grippers 31 is hinged to one end of each of the three push rods via pins. The other ends of the three push rods are all hinged to the same pin in a groove on the top surface of the base cover 321. The two ends of the spring 323 are fixed by welding to the center position of the top of the inner wall of the base cover 321 and the corresponding position of the bottom of the sleeve 1. When the molybdenum alloy head 2 is inserted into the sleeve 1 and presses down on the base cover 321, the base cover 321 drives the push rods to swing, thereby pushing the three grippers 31 to move synchronously towards the center along the inner wall of the sleeve 1. 1. Made of No. 45 steel, tempered to enhance strength and toughness; 2. Spring 323 is made of 60Si2Mn spring steel, which has excellent elastic recovery and fatigue resistance. The hinged connection between the push rod, the gripper 31, and the base cover 321 ensures that the power transmission can be evenly transmitted to the three grippers 31 to achieve synchronous clamping; 3. The elasticity of the spring 323 can provide continuous preload, preventing the molybdenum alloy head 2 from loosening due to vibration, and at the same time buffering the impact force when the molybdenum alloy head 2 is inserted, solving the problem of uneven clamping force and easy loosening in traditional fixing structures, and improving the stability and safety of fixing the molybdenum alloy head 2.

[0017] A column 4 is movably sleeved inside the spring 323, and the column 4 is slidably installed at the bottom of the sleeve 1, with the top of the column 4 fixed to the top of the inner wall of the base cover 321. Specifically, column 4 is a cylindrical structure. The bottom of column 4 passes through a through hole opened at the bottom of sleeve 1, and column 4 is slidably connected to the inner wall of the through hole. The top of column 4 is fixed to the center position of the top of the inner wall of base cover 321 by welding. When base cover 321 moves up and down, column 4 can slide synchronously along the bottom through hole of sleeve 1, which plays a guiding role in the movement direction of base cover 321. Column 4 is made of 304 stainless steel, which has good corrosion resistance and wear resistance, avoiding rust or wear caused by long-term sliding. The fixed connection between column 4 and base cover 321 and the sliding fit with sleeve 1 can limit the radial displacement of base cover 321 when it moves, ensuring that the push rod can stably drive the gripper 31 to move synchronously. At the same time, column 4 plays a supporting and guiding role for spring 323, preventing spring 323 from bending and deforming when compressed, solving the problem of spring 323 being easy to deviate and base cover 321 shaking, which leads to clamping failure, and improving the stability of the operation of transmission clamping component 3.

[0018] A limit nut 5 is threaded onto the surface of column 4, and the limit nut 5 is located at the bottom of sleeve 1; It should be noted that the inner wall of the limiting nut 5 has an internal thread that matches the external thread on the surface of the column 4. The limiting nut 5 is threaded and sleeved on the surface of the column 4, and is located on the outer side of the bottom of the sleeve 1. When the limiting nut 5 is rotated and moves up and down along the thread of the column 4, the maximum downward movement distance of the base cover 321 can be adjusted. When the top of the limiting nut 5 is in contact with the bottom of the sleeve 1, the upward movement of the column 4 and the base cover 321 can be restricted, thereby locking the position of the gripper 31. The limiting nut 5 is made of Q235 steel and the surface is galvanized to enhance corrosion resistance. The threaded engagement between the limiting nut 5 and the column 4 allows for flexible adjustment of the clamping tightness of the gripper 31, adapting to different sizes of molybdenum alloy heads 2. At the same time, by locking the position of the base cover 321, the gripper 31 is prevented from loosening, solving the problem that traditional fixed structures cannot adjust the clamping force and are difficult to adapt to different sizes of workpieces, thus improving the versatility and clamping reliability of the device.

[0019] A protective cover 6 is threadedly installed at the top opening of the sleeve 1, and a protective cotton block 7 is fixedly installed inside the top of the protective cover 6; Specifically, the inner wall of the cover 6 has an internal thread that matches the external thread on the outer wall of the top of the sleeve 1. The cover 6 is installed at the top opening of the sleeve 1 via a threaded connection. The protective cotton block 7 is a flexible block structure that is fixed to the top of the cover 6 by adhesive bonding. When the cover 6 is tightened, the protective cotton block 7 can fit tightly against the top surface of the molybdenum alloy head 2. The cover 6 is made of ABS engineering plastic, which is lightweight and has a certain strength. The protective cotton block 7 is made of high-density sponge, which is soft and elastic. The threaded connection between the cover 6 and the sleeve 1 can achieve a sealed protection of the top opening of the sleeve 1, preventing dust and impurities from entering the sleeve 1 and contaminating the molybdenum alloy head 2. The protective cotton block 7 can buffer the contact pressure between the cover 6 and the top of the molybdenum alloy head 2, preventing the top of the molybdenum alloy head 2 from being damaged by collision. At the same time, it fills the gap between the cover 6 and the top of the molybdenum alloy head 2, further limiting the upward movement and shaking of the molybdenum alloy head 2. This solves the problems of no protection at the top of the sleeve 1, easy contamination of the molybdenum alloy head 2, and wear at the top, thus improving the overall protection effect.

[0020] The ends of the three grippers 31 are all slidably mounted inside the sleeve 1, and the top of the grippers 31 is fixedly mounted with a ramp surface 8 for guiding the molybdenum alloy head 2. The gripper 31 is made of 20CrMnTi alloy structural steel and is carburized and quenched to enhance its surface hardness and wear resistance. The surface of the ramp 8 can be coated with polytetrafluoroethylene to reduce the coefficient of friction with the molybdenum alloy head 2. The guiding effect of the ramp 8 allows the molybdenum alloy head 2 to be quickly and smoothly inserted into the sleeve 1 without the need for manual adjustment of the gripper 31 position. This solves the problems of difficulty in inserting the molybdenum alloy head 2 and easy displacement of the gripper 31, improving the ease of use and clamping accuracy of the device.

[0021] An adhesive layer 9 is provided on one side of the slope surface 8 and the surface of the three grippers 31, and a protective cotton 10 is fixedly installed on the top of the base cover 321. The adhesive layer 9 is a flexible adhesive film that is bonded to the surface of the ramp 8 and the side of the gripper 31 near the molybdenum alloy head 2. The protective cotton 10 is a flexible sheet structure that is bonded to the top surface of the base cover 321. When the molybdenum alloy head 2 is placed into the sleeve 1, the adhesive layer 9 can be tightly bonded to the outer wall of the molybdenum alloy head 2, and the protective cotton 10 can be tightly bonded to the bottom of the molybdenum alloy head 2. The adhesive layer 9 is made of silicone, which has good flexibility and wear resistance and does not damage the surface of the molybdenum alloy head 2. The protective cotton 10 is made of wool felt, which is soft and has good shock absorption. The adhesive layer 9 can increase the friction between the gripper 31 and the molybdenum alloy head 2, improve the clamping stability, and at the same time prevent the gripper 31 from hard contacting and damaging the outer wall of the molybdenum alloy head 2. The protective cotton 10 can buffer the impact force of the collision between the bottom of the molybdenum alloy head 2 and the base cover 321 to prevent bottom wear.

[0022] All threaded mounting surfaces in this application utilize a modified triangular thread with a self-locking function. The thread helix angle is designed to be 1.5°-2.5° to enhance the anti-loosening effect. After phosphating, the thread surface is coated with an 8-12μm Dacromet coating and impregnated with silicone sealant to form a sealing layer, resulting in excellent corrosion resistance. In addition, the thread can effectively expel dust, and it can still be used normally even if a small amount of dust adheres to it.

[0023] When storing the unused molybdenum alloy head 2, place it bottom-down into the sleeve 1. Since the tops of the three grippers 31 all have ramps 8, the molybdenum alloy head 2 moves downwards, squeezing the three grippers 31 away from each other until the bottom of the molybdenum alloy head 2 contacts and squeezes the base cover 321. This causes the base cover 321 to move downwards and compress the spring 323. At this point, the three transmission rods 322 swing, causing the three grippers 31 to clamp the molybdenum alloy head 2. An adhesive layer 9 is provided on the side of the grippers 31 closest to the molybdenum alloy head 2 to protect its surface. Similarly, the ramps 8 also have an adhesive layer. The base cover 321 has a protective cotton 10 on top to protect the bottom of the molybdenum alloy head 2. The spring 323 provides pre-tightening force to achieve a preliminary clamping effect. By rotating the limit nut 5, when the top of the limit nut 5 is in contact with the bottom of the sleeve 1, the column 4 and the base cover 321 cannot move upward, and the three claws 31 are locked, making the molybdenum alloy head 2 more secure. The top of the sleeve 1 is threaded with a protective cover 6 to protect the opening at the top of the sleeve 1. At the same time, the protective cover 6 has a protective cotton block 7 inside to protect the conical head of the molybdenum alloy head 2. In addition, the surface of the sleeve 1 is coated with a wear-resistant coating.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A molybdenum alloy mandrel with a wear-resistant sheath structure, characterized in that, include: Sleeve (1), molybdenum alloy head (2) and transmission clamp (3), wherein the transmission clamp (3) and the molybdenum alloy head (2) are both installed inside the sleeve (1), and the transmission clamp (3) is used to quickly limit and protect the molybdenum alloy head (2); The transmission clamping component (3) includes a jaw (31) and a transmission component (32). Three evenly distributed jaws (31) are slidably installed inside the sleeve (1). The transmission component (32) is installed inside the sleeve (1) to realize the synchronous closing of the three jaws (31) to limit the clamping of the molybdenum alloy head (2).

2. The molybdenum alloy mandrel with a wear-resistant sheath structure according to claim 1, characterized in that: The transmission component (32) includes a base cover (321), a transmission rod (322) and a spring (323). The bottom of each of the three grippers (31) is hinged with a push rod. The adjacent ends of the three push rods are hinged to the groove on the surface of the base cover (321). A spring (323) is installed between the top of the inner wall of the base cover (321) and the bottom of the sleeve (1).

3. A molybdenum alloy mandrel with a wear-resistant sheath structure according to claim 2, characterized in that: A column (4) is movably sleeved inside the spring (323), and the column (4) is slidably installed at the bottom of the sleeve (1). The top of the column (4) is fixed to the top of the inner wall of the base cover (321).

4. A molybdenum alloy mandrel with a wear-resistant sheath structure according to claim 3, characterized in that: The column (4) is threaded with a limiting nut (5), which is located at the bottom of the sleeve (1).

5. A molybdenum alloy mandrel with a wear-resistant sheath structure according to claim 4, characterized in that: A protective cover (6) is threaded onto the top opening of the sleeve (1), and a protective cotton block (7) is fixedly installed inside the top of the protective cover (6).

6. A molybdenum alloy mandrel with a wear-resistant sheath structure according to claim 5, characterized in that: The ends of the surfaces of the three grippers (31) are slidably mounted inside the sleeve (1), and the top of the grippers (31) is fixedly mounted with a ramp surface (8) for guiding the molybdenum alloy head (2).

7. A molybdenum alloy mandrel with a wear-resistant sheath structure according to claim 6, characterized in that: The slope surface (8) and the three grippers (31) are provided with adhesive layers (9), and the top of the base cover (321) is fixedly installed with protective cotton (10).

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