High strength piercing mandrel

Abstract

The utility model relates to the technical field of piercing machine top head, and disclose a kind of for high-strength piercing machine top head, including top head base body, top head base body bottom is fixedly connected with connector, connector bottom is fixedly connected with fixed block and one end is fixedly connected with connecting threaded rod, first support block, second support block, baffle are equipped in top head base body interior, baffle side is equipped with heat sink, other end is drill bit, first heat dissipation cavity is formed between baffle and drill bit, support shaft is equipped in top head base body, second heat dissipation cavity is formed between support shaft and baffle, there is heat dissipation hole on heat sink, support plate is also equipped in base body, top head constructs stable support system by internal support block, support shaft and support plate, improves structural strength, connector and threaded rod cooperate fixed block to enhance connection stability, baffle and heat sink, heat dissipation hole form efficient heat dissipation system, in combination with drill bit wear-resistant material, effectively reduce deformation, cracking, prolong life, guarantee the precision and efficiency of piercing, applicable to high-strength seamless steel tube piercing operation.

Description

Technical Field

[0001] This utility model relates to the field of drilling machine mandrel technology, and in particular to a high-strength drilling machine mandrel. Background Technology

[0002] In seamless steel pipe production, the piercing mill mandrel is a key component. It directly participates in the high-temperature, high-pressure, and highly frictional piercing operation, and its performance has a significant impact on production efficiency and steel pipe quality. Traditional piercing mill mandrels often fail to meet the demands of modern high-strength and high-precision production due to structural and performance defects. Structurally, early mandrels were mostly solid or simply hollow designs with insufficient internal support. During operation, they were prone to deformation and cracking under the strong extrusion and friction of the pipe, shortening their service life. Frequent mandrel replacements would interrupt production, reduce efficiency, and increase equipment downtime and spare parts costs. Furthermore, the traditional connection structure lacked stability; loosening during operation would affect piercing accuracy, leading to uneven steel pipe wall thickness, surface defects, and increased scrap rates. In terms of heat dissipation and wear resistance, traditional mandrels had a simplistic heat dissipation design, making it difficult to dissipate the large amount of heat generated during piercing in a timely manner. High temperatures would accelerate the wear of the mandrel. Oxidation and softening of the mandrel material exacerbate wear, leading to failures such as nose collapse and steel adhesion. This not only reduces the mandrel's lifespan but also scratches the inner wall of the steel pipe due to the deterioration of the mandrel's surface quality, affecting product quality. Furthermore, insufficient wear resistance of the mandrel results in rapid surface wear when in contact with high-temperature pipe materials, further shortening the service life and increasing production costs. As seamless steel pipes develop towards higher strength, higher precision, and more diverse materials (such as the increased use of high-alloy steel and stainless steel, which are difficult to deform), the comprehensive performance requirements for the strength, heat dissipation, wear resistance, and stability of piercing machine mandrels are becoming increasingly stringent. Traditional mandrels, due to structural design defects and imperfect heat dissipation and wear resistance mechanisms, can no longer meet modern production needs. Developing new piercing machine mandrels with high-strength support, efficient heat dissipation, excellent wear resistance, and stable connection has become an urgent need to improve the production efficiency and quality of seamless steel pipes. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a high-strength perforation machine head, which has the advantages of reinforced structure, optimized heat dissipation, and improved lifespan, thus solving the problems mentioned in the background section.

[0004] This utility model provides the following technical solution: a high-strength drilling machine mandrel, wherein a connector is fixedly connected to the bottom of the mandrel base, a fixing block is fixedly connected to the bottom of the connector, a threaded rod is fixedly connected to the bottom of the connector, a first support block is fixedly connected inside the mandrel base, a second support block is fixedly connected to the opposite side of the mandrel base to the first support block, a partition is provided inside the mandrel base, a heat dissipation plate is fixedly connected to the bottom of the partition, a drill bit is provided at the end of the mandrel base away from the connector, a first heat dissipation cavity is formed between the partition and the drill bit, a support shaft is fixedly connected to the center inside the mandrel base, a second heat dissipation cavity is formed between the support shaft and the partition, heat dissipation holes are provided on the heat dissipation plate, a support plate is fixedly connected inside the mandrel base, the middle part of the support plate is fixedly connected to the outer surface of the support shaft, and the support plate penetrates the side wall of the partition.

[0005] Preferably, the first support block and the second support block are symmetrically distributed in the top head base, and the first support block, the second support block, the support shaft, and the support plate cooperate to enhance the structural strength of the top head base.

[0006] Preferably, the heat sink has a ring structure with heat dissipation holes evenly distributed on it. The first and second heat dissipation cavities are connected to the outside through the heat dissipation holes, forming a heat dissipation channel.

[0007] Preferably, the connector is threaded to the drilling machine via a threaded rod, and the fixing block is used to reinforce the connection between the connector and the machine to prevent loosening.

[0008] Preferably, the drill bit is made of wear-resistant and high-temperature resistant material, and its sharp structure is suitable for piercing operations, directly contacting and piercing the pipe.

[0009] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model constructs a stable internal support structure through the cooperation of a first support block, a second support block, a support shaft, and a support plate, which greatly improves the strength of the mandrel base, effectively resists complex stresses such as extrusion and friction during piercing, reduces the risk of deformation and cracking, ensures the structural stability of the mandrel under high-intensity operation, and extends the overall service life. At the same time, the connector is threaded to the piercing machine through a threaded rod and reinforced with a fixing block to ensure a stable connection between the mandrel and the equipment, avoids loosening and displacement during operation, maintains piercing accuracy, and reduces equipment failure and product quality deviation caused by connection problems.

[0010] 2. This utility model separates the first and second heat dissipation chambers by a partition plate, and combined with the heat dissipation holes on the heat dissipation plate, forms a multi-channel heat dissipation system. It can quickly dissipate the heat generated by perforation, reduce the working temperature of the mandrel, alleviate the deterioration of material properties caused by high temperature (such as strength reduction, accelerated oxidation, etc.), delay the wear and failure of the mandrel, improve durability, and reduce damage caused by thermal fatigue. At the same time, the drill bit is made of wear-resistant and high-temperature resistant materials, which are suitable for perforation operation conditions, enhance the wear resistance of the parts in contact with the pipe, reduce the loss during the perforation process, ensure the long-term stable operation of the mandrel, and reduce the cost and efficiency impact caused by frequent mandrel replacement. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of the present utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the heat sink structure of this utility model.

[0012] In the figure: 1. Top base; 2. Connector; 3. Fixing block; 4. Threaded rod; 5. First support block; 6. Second support block; 7. Partition plate; 8. Heat sink plate; 9. Drill bit; 10. First heat sink cavity; 11. Support shaft; 12. Second heat sink cavity; 13. Heat sink hole; 14. Support plate. Detailed Implementation

[0013] 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.

[0014] Please see Figures 1-3 A high-strength drilling machine mandrel includes a mandrel base 1 with a connector 2 fixedly connected to the bottom, a fixing block 3 fixedly connected to the bottom of the connector 2, a threaded rod 4 fixedly connected to the bottom of the connector 2, a first support block 5 fixedly connected inside the mandrel base 1, a second support block 6 fixedly connected to the opposite side of the mandrel base 1 to the first support block 5, a partition 7 provided inside the mandrel base 1, a heat dissipation plate 8 fixedly connected to the bottom of the partition 7, a drill bit 9 provided at the end of the mandrel base 1 away from the connector 2, a first heat dissipation cavity 10 formed between the partition 7 and the drill bit 9, a support shaft 11 fixedly connected to the center inside the mandrel base 1, a second heat dissipation cavity 12 formed between the support shaft 11 and the partition 7, heat dissipation holes 13 opened on the heat dissipation plate 8, a support plate 14 fixedly connected inside the mandrel base 1, the middle part of the support plate 14 fixedly connected to the outer surface of the support shaft 11, and the support plate 14 penetrating the side wall of the partition 7.

[0015] Please see Figures 1-3 The first support block 5 and the second support block 6 are symmetrically distributed within the top base 1, and the first support block 5, the second support block 6 cooperate with the support shaft 11 and the support plate 14 to enhance the structural strength of the top base 1.

[0016] Please see Figures 1-3 The heat sink 8 has a ring structure, and the heat dissipation holes 13 are evenly distributed on the heat sink 8. The first heat dissipation cavity 10 and the second heat dissipation cavity 12 are connected to the outside through the heat dissipation holes 13, forming a heat dissipation channel.

[0017] Please see Figures 1-3 The connector 2 is threadedly connected to the drilling machine via the threaded rod 4, and the fixing block 3 is used to reinforce the connection between the connector 2 and the equipment to prevent loosening.

[0018] Please see Figures 1-3 Drill bit 9 is made of wear-resistant and high-temperature resistant materials. Its sharp structure is suitable for piercing operations, directly contacting and piercing the pipe.

[0019] Working principle: When the high-strength piercing machine mandrel is working, the drill bit 9 of the mandrel base 1 first contacts the pipe to be pierced. With its sharp structure and high-strength material, it performs piercing operations on the pipe, withstanding the extrusion and friction forces during the piercing process. The connector 2 is connected to the piercing machine equipment via the threaded rod 4, and the fixing block 3 reinforces the connection, ensuring the stability of the mandrel and the equipment and preventing loosening during operation. In the internal structure, the first support block 5, the second support block 6, the support shaft 11, and the support plate 14 cooperate with each other to provide support for the mandrel base 1, enhancing the overall strength and resistance to deformation, and coping with the complex stress during piercing. At the same time, the partition plate 7 separates the first heat dissipation cavity 10 and the second heat dissipation cavity 12. The heat generated during piercing is transferred to the heat dissipation cavity through the mandrel base 1 and then dissipated to the outside through the heat dissipation holes 13 on the heat dissipation plate 8, effectively reducing the mandrel temperature and preventing performance and lifespan from being affected by high temperature, ensuring the continuous and stable operation of the mandrel. All components work together to achieve efficient and stable piercing operations.

Claims

1. A high-strength piercing machine mandrel, comprising a mandrel base (1), characterized in that: The top base (1) is fixedly connected to a connector (2) at its bottom. The connector (2) is fixedly connected to a fixing block (3) at its bottom. The connector (2) is fixedly connected to a threaded rod (4) at its bottom. The top base (1) is fixedly connected to a first support block (5) inside. The top base (1) is fixedly connected to a second support block (6) on the opposite side of the first support block (5). The top base (1) is provided with a partition (7) inside. The partition (7) is fixedly connected to a heat sink (8) at its bottom. The top base (1) is located away from the connector (2). A drill bit (9) is provided at one end. A first heat dissipation cavity (10) is formed between the partition plate (7) and the drill bit (9). A support shaft (11) is fixedly connected to the center of the top head base (1). A second heat dissipation cavity (12) is formed between the support shaft (11) and the partition plate (7). Heat dissipation holes (13) are provided on the heat dissipation plate (8). A support plate (14) is fixedly connected to the inside of the top head base (1). The middle part of the support plate (14) is fixedly connected to the outer surface of the support shaft (11), and the support plate (14) penetrates the side wall of the partition plate (7).

2. The high-strength piercing machine mandrel according to claim 1, characterized in that: The first support block (5) and the second support block (6) are symmetrically distributed in the top base (1), and the first support block (5) and the second support block (6) cooperate with the support shaft (11) and the support plate (14) to enhance the structural strength of the top base (1).

3. The high-strength piercing machine mandrel according to claim 2, characterized in that: The heat sink (8) has a ring structure, and heat dissipation holes (13) are evenly distributed on the heat sink (8). The first heat dissipation cavity (10) and the second heat dissipation cavity (12) are connected to the outside through the heat dissipation holes (13) to form a heat dissipation channel.

4. A high-strength piercing machine mandrel according to claim 3, characterized in that: The connector (2) is threadedly connected to the drilling machine via a threaded rod (4), and the fixing block (3) is used to reinforce the connection between the connector (2) and the equipment to prevent loosening.

5. A high-strength piercing machine mandrel according to claim 4, characterized in that: The drill bit (9) is made of wear-resistant and high-temperature resistant material. Its sharp structure is suitable for piercing operations, and it directly contacts and pierces the pipe.

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