A cold drawing die

Abstract

This utility model discloses a cold drawing die, including a die body with a through die hole. One end of the die hole has a larger opening than the other end, with the larger opening serving as the steel pipe inlet and the smaller opening as the steel pipe outlet. A measuring rod is provided on the die body, located on one side of the smaller opening of the die hole. The measuring rod is parallel to the axis of the die hole and has a dimensional scale. The fixed end passes through the die hole. The length of the fixed end extending out is detected by the measuring rod. If the fixed section is too short, it is removed and the fixed section of the steel pipe is rolled again to avoid interruption during stretching and affect production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of steel pipe mold technology, and more specifically relates to a cold drawing mold. Background Technology

[0002] Large-diameter steel pipe raw materials need to be drawn into small-diameter steel pipes through a cold drawing equipment, and then the small-diameter steel pipes are used to produce products. The cold drawing equipment contains molds, and large-diameter steel pipes can be transformed into small-diameter steel pipes by passing through the molds.

[0003] Before cold stretching, a rolling mechanism is used to roll one end of the steel pipe into a small-diameter fixed end. Then, the fixed end passes through the mold and is clamped and fixed by the clamping mechanism on the stretching mechanism in the equipment. The stretching mechanism can pull the large-diameter steel pipe through the mold by moving.

[0004] The rolling of steel pipes is usually done manually. The length rolled at the fixed end usually depends on the experience of the workers, which can result in the pipe being too long or too short. Since the clamping starting position of the clamping mechanism is fixed, if the fixed end is rolled too short, the clamping mechanism cannot effectively clamp the fixed end, and it may come off during subsequent cold stretching, interrupting the cold stretching process and causing the steel pipe to be of substandard quality. Furthermore, the clamping mechanism needs to be re-clamped to stretch the remaining part of the steel pipe, and it is easier to come off again during the second stretching, which greatly reduces production efficiency. If the rolled length is too long, it will result in the waste of steel pipe (the fixed end is cut off after the steel pipe is cold stretched). Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a cold stretching die with a measuring mechanism to measure the length of the steel pipe passing through the die, thus preventing the steel pipe from detaching and interrupting production during stretching, which would affect production efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cold drawing die, comprising a die body, the die body having a through die hole, one end of the die hole having a larger opening than the other end, the larger opening being the steel pipe inlet and the smaller opening being the steel pipe outlet, the die body having a measuring rod, and the measuring rod being located on one side of the smaller opening of the die hole on the die body, the measuring rod being parallel to the axis of the die hole, and the measuring rod having a size scale.

[0007] Furthermore, a slider is slidably connected to the measuring rod, a baffle is provided on the slider, and an indicator needle with a corresponding size scale is provided on the slider.

[0008] Furthermore, a spring is provided between the slider and the measuring rod, and the spring has a pulling force to pull the slider toward the mold body.

[0009] Furthermore, the measuring rod is provided with two limiting blocks, which are located on both sides of the slider respectively, and a scale plate is provided between the two limiting blocks, with the size scale located on the scale plate.

[0010] Furthermore, a bracket is rotatably connected to the mold body, and the measuring rod is located on the bracket.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: the end of the steel pipe after being rolled by the rolling device first passes through the mold on the equipment during cold stretching. After the steel pipe is stuck on the mold, the length of the fixed end of the steel pipe after passing through the main body of the mold can be measured by the measuring rod to determine the rolling length of the fixed end of the steel pipe. If the fixed section is found to be too short, the fixed section of the steel pipe is removed again and rolled again, thereby avoiding the interruption of production efficiency during stretching. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the cold drawing die of this utility model.

[0013] Reference numerals: 1. Mold body; 2. Mold hole; 3. Measuring rod; 4. Dimension scale; 5. Slider; 6. Baffle; 7. Indicator needle; 8. Spring; 9. Limiting block; 10. Scale plate; 11. Bracket; 12. Fixed end. Detailed Implementation

[0014] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0016] Reference Figure 1 The present invention will be further described below.

[0017] A cold drawing die includes a die body 1 with a through die hole 2. One end of the die hole 2 has a larger opening than the other end; the larger opening is for the steel pipe inlet, and the smaller opening is for the steel pipe outlet. A measuring rod 3 is mounted on the die body 1, located to one side of the smaller opening of the die hole 2. The measuring rod 3 is parallel to the axis of the die hole 2, and the measuring rod 3 has dimensional graduations 4. Figure 1 As shown, the end of the steel pipe, after being rolled by the roller pressing device, first passes through the mold on the equipment during cold stretching. Once the steel pipe is secured to the mold, the length of the fixed end 12 of the steel pipe after passing through the mold body 1 can be measured using the measuring rod 3 to determine the rolling length of the fixed end 12. If the fixed section is found to be too short, it is removed and rolled again to prevent interruption during stretching, which would affect production efficiency. Specifically, during cold stretching, the steel pipe is continuously conveyed; that is, after the previous steel pipe is cold stretched, the next steel pipe is ready at the loading station. Therefore, if the length of the fixed end 12 on the steel pipe fails the length test, it is immediately removed, and the next steel pipe is fed into the equipment. Although this slightly reduces production efficiency, it avoids interruption during cold stretching and thus improves overall production efficiency. Figure 1 As shown, specifically, the mold body 1 includes an outer shell and an internal mold core, with the mold hole 2 located on the mold core, which is existing technology. Figure 1 As shown, in this preferred embodiment, a slider 5 is slidably connected to the measuring rod 3. A baffle 6 is provided on the slider 5, and an indicator needle 7 corresponding to the size scale 4 is provided on the slider 5. Specifically, when the fixed section of the steel pipe passes through the die hole 2 and contacts the baffle 6, it can push the baffle 6 to move, causing the slider 5 to slide on the measuring rod 3. The length of the fixed end 12 can be measured more intuitively and accurately through the indicator needle 7. Specifically, the measuring rod 3 is provided with a guide groove extending along its axis, and the slider 5 is provided with a guide block. The guide block slides within the guide groove, enabling the slider 5 to slide axially on the measuring rod 3 and preventing circumferential rotation of the slider 5. Figure 1 As shown, in this preferred embodiment, a spring 8 is provided between the slider 5 and the measuring rod 3. The spring 8 has a pulling force that pulls the slider 5 towards the mold body 1. Specifically, when the fixed end 12 pushes the baffle 6, the slider 5 slides and stretches the spring 8. When the baffle 6 is not in contact with the fixed end 12, the slider 5 slides to the measurement starting point through the pulling force of the spring 8. Figure 1 As shown, in this preferred embodiment, the measuring rod 3 is provided with two limiting blocks 9, which are located on both sides of the slider 5 respectively. A scale plate 10 is provided between the two limiting blocks 9, and the size scale 4 is located on the scale plate 10. Figure 1As shown, specifically, one end of the scale plate 10 passes through the limiting block 9 near the mold body 1, and it is slidable between itself and the limiting block 9. The limiting block 9 is slidably connected to the measuring rod 3, and a clamping bolt is provided between the limiting block 9 and the measuring rod 3. The position of the limiting block 9 is fixed by the clamping bolt, that is, the range of the qualified length of the fixed block is adjusted by adjusting the position of the limiting block 9. Specifically, another limiting block 9 away from the mold body 1 can be connected to the measuring rod 3 by a sleeve or other detachable connection method, and its position on the measuring rod 3 is fixed. The scale plate 10 is fixedly connected to the limiting block 9. The scale plate 10 can be connected to the limiting block 9 by plugging in or directly welded. Figure 1 As shown in this example, preferably, a bracket 11 is rotatably connected to the mold body 1, and the measuring rod 3 is located on the bracket 11. Specifically, after measurement, the bracket 11 is directly rotated so that the measuring rod 3 is no longer located on the side of the small opening on the mold body 1, avoiding interference with the clamping mechanism. The state after rotation is as follows. Figure 1 The middle dashed line section.

[0018] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A cold drawing die, comprising a die body, the die body having a through die hole, one end of the die hole having a larger opening than the other end, the larger opening being the inlet of a steel pipe and the smaller opening being the outlet of a steel pipe, characterized in that: A measuring rod is provided on the mold body, and the measuring rod is located on one side of the small opening of the mold hole on the mold body. The measuring rod is parallel to the axis of the mold hole, and the measuring rod is provided with size scale.

2. The cold drawing die according to claim 1, characterized in that: A slider is slidably connected to the measuring rod, a baffle is provided on the slider, and an indicator needle with a corresponding size scale is provided on the slider.

3. The cold drawing die according to claim 2, characterized in that: A spring is provided between the slider and the measuring rod, and the spring has a pulling force to pull the slider toward the mold body.

4. The cold drawing die according to claim 2, characterized in that: The measuring rod is provided with two limiting blocks, which are located on both sides of the slider. A scale plate is provided between the two limiting blocks, and the size scale is located on the scale plate.

5. The cold drawing die according to claim 1, characterized in that: A bracket is rotatably connected to the main body of the mold, and the measuring rod is located on the bracket.

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