Steel pipe hole drawing die

Abstract

The utility model discloses a steel pipe hole drawing die which comprises an upper clamping die installed at the lower end of an upper pressing plate of equipment and a lower clamping die installed on a base of the equipment, and further comprises a drawing core rod for a steel pipe to be arranged in a sleeved mode, the drawing core rod is connected to the base of the equipment in a sliding mode through a fixing base, and a punch is installed on the drawing core rod. A drawing female die matched with the punches is installed in the lower clamping die, the specifications of the punches and the corresponding drawing female die are changed according to the size and the shape of a drawing hole needed by the steel pipe, and the steel pipe is extruded multiple times through the punches and the drawing female dies of different specifications till the drawing hole meeting the drawing requirement is drawn out of the steel pipe. In this way, it can be guaranteed that the drawing opening cannot crack through multiple times of drawing, the steel pipe is clamped by the upper clamping die and the lower clamping die, the diameter of the drawing core rod is determined according to the inner diameter of the steel pipe, the steel pipe is protected against deformation and cracking while being drawn, and the production efficiency and the qualified rate are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe drawing and hole-turning, in particular to a steel pipe hole-turning die. Background Art

[0002] In current mechanical processing, it is necessary to draw and flanging a hole on one side of a steel pipe according to requirements. Generally, the steel pipe is drawn from the inside to the outside to the size required by the drawing. However, when drawing from the inside to the outside, it is very likely that the force is too great, causing the steel pipe to deform and crack, and thus unable to meet subsequent processing requirements. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model provides a steel pipe hole drawing die.

[0004] The utility model proposes a steel pipe hole drawing die, comprising an upper clamping die installed at the lower end of a pressure plate on an equipment and a lower clamping die installed on an equipment base, which are relatively arranged, and also comprises a drawing mandrel for sleeved by the steel pipe, the drawing mandrel is slidably connected to the equipment base through a fixed seat, a punch is installed on the drawing mandrel, and a drawing die matching the punch is installed in the lower clamping die, the specifications of the punch and the corresponding drawing die are replaced according to the size and shape of the drawing hole required for the steel pipe, and the steel pipe is squeezed multiple times by using the punches and the drawing dies of multiple specifications until the steel pipe is pulled out with a drawing hole that meets the requirements of the drawing.

[0005] Preferably, a front pressure block and a rear pressure block for pressing the drawing mandrel are also installed at the lower end of the upper pressure plate of the equipment, and the front pressure block and the rear pressure block are respectively located on both sides of the upper clamping die, and a limiting block is provided on the side of the lower clamping die close to the fixed seat, and a lifting block is also slidably installed on the side of the equipment base away from the fixed seat, and the lifting block can be pushed toward the direction of the fixed seat to push the steel pipe to the end face of the limiting block to complete the positioning.

[0006] Preferably, a guide column is provided on the device base, and a sliding hole is provided on the fixing seat, and the fixing seat slides up and down along the guide column through the sliding hole.

[0007] Preferably, a first elastic member is provided between the upper clamping die and the upper pressure plate of the equipment, and a second elastic member is sleeved on the guide column below the fixing seat.

[0008] Preferably, the first elastic member is configured as spring I, and the second elastic member is configured as spring II.

[0009] Preferably, the end of the drawing mandrel is fixed to the fixing seat by means of bolts.

[0010] In summary, the utility model has the following beneficial effects: the upper pressure plate of the equipment presses down to drive the upper clamping die and the drawing mandrel to move downward synchronously. After the upper clamping die and the lower clamping die are clamped, the front and rear pressure blocks continue to press down to drive the drawing mandrel to squeeze the steel pipe downward, thereby realizing the drawing and turning of the steel pipe. The steel pipe is squeezed multiple times by using a plurality of punches and drawing dies of different specifications until the steel pipe is pulled out with a drawing hole that meets the requirements of the drawing. Multiple drawing can ensure that the drawing mouth will not crack. The upper clamping die and the lower clamping die clamp the steel pipe. The diameter of the drawing mandrel is determined according to the inner diameter of the steel pipe. While drawing the steel pipe, the steel pipe is protected from deformation and cracking, thereby improving production efficiency and qualified rate.

[0011] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of a processed steel pipe according to an embodiment of the utility model;

[0013] Figure 2 This is a schematic diagram of the hole extraction mold structure of the first process of the embodiment of the utility model;

[0014] Figure 3 This is a schematic diagram of the second process hole drawing mold structure of an embodiment of the utility model.

[0015] In the figure:

[0016] 1. Ejector block; 2. Upper clamping die; 3. Lower clamping die; 4. Punch; 5. Drawing mandrel; 6. Rear pressure block; 7. Front pressure block; 8. Steel pipe; 9. Limit block; 10. Ejector block; 11. Drawing die. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] like Figure 1-3As shown, a steel pipe hole drawing die proposed in this embodiment includes an upper clamping die 2 mounted on the lower end of the equipment pressure plate (not shown in the figure) and a lower clamping die 3 mounted on the equipment base (not shown in the figure), and also includes a drawing mandrel 5 for the steel pipe 8 to be sleeved. The drawing mandrel 5 is slidably connected to the equipment base through a fixed seat (not shown in the figure) (the end of the drawing mandrel is fixed to the fixed seat by bolts), a punch 4 is installed on the drawing mandrel 5, and a drawing die 11 matching the punch 4 is installed in the lower clamping die 3 (the drawing die 11 and the lower clamping die 3 have an interference fit), and the specifications of the punch 4 and the corresponding drawing die 11 are replaced according to the size and shape of the drawing hole required for the steel pipe 8. The steel pipe 8 is squeezed multiple times by a plurality of punches and drawing dies 11 of different specifications until the steel pipe 8 is pulled out with a drawing hole that meets the requirements of the drawing. When the equipment pressure plate is pressed down, the fixed seat and the drawing mandrel are pressed down, and then the punch is driven to complete the hole drawing of the steel pipe 8.

[0019] Furthermore, in order to facilitate demoulding after the steel pipe is drawn, a top block 10 is further provided in the lower clamping die 3 , and the top block 10 plays a demoulding role, and a spring is provided inside the top block 10 .

[0020] In this way, the upper clamping plate of the equipment presses down to drive the upper clamping die 2 and the drawing mandrel 5 to move downward synchronously. After the upper clamping die 2 and the lower clamping die 3 are clamped, the upper clamping plate of the equipment continues to press down to drive the drawing mandrel 5 to squeeze the steel pipe 8 downward, thereby drawing and turning the steel pipe 8. The steel pipe 8 is squeezed multiple times by punches 4 and drawing dies 11 of different specifications until the steel pipe 8 is pulled out with a drawing hole that meets the requirements of the drawing. Multiple drawing can ensure that the drawing mouth will not crack. The upper clamping die 2 and the lower clamping die 3 clamp the steel pipe 8. The diameter of the drawing mandrel 5 is determined according to the inner diameter of the steel pipe. While drawing the steel pipe 8, the steel pipe is protected from deformation and cracking, thereby improving production efficiency and qualified rate.

[0021] Furthermore, if Figure 2 and Figure 3 As shown, a front pressing block 7 and a rear pressing block 6 for pressing the drawing mandrel 5 are also installed at the lower end of the upper pressing plate of the equipment. The front pressing block 7 and the rear pressing block 6 are respectively located on both sides of the upper clamp 2, and a limiting block 9 is provided on the side of the lower clamp 3 close to the fixed seat. A lifting block 1 is also slidably installed on the side of the equipment base away from the fixed seat. The lifting block 1 can be pushed toward one side of the fixed seat to push the steel pipe 8 to the end face of the limiting block 9 to complete the positioning.

[0022] Furthermore, a driving motor (not shown in the figure) for driving the lifting block 1 to slide is also installed on the base of the equipment. The driving motor drives the lifting block 1 to slide back and forth along the base of the equipment through a transmission mechanism. The specific structure of the transmission mechanism can refer to the existing structure, such as a screw nut mechanism, etc., which can convert rotational motion into linear motion. The details will not be repeated in this article.

[0023] In this embodiment, a guide column (not shown in the figure) is provided on the base of the equipment, and a sliding hole is provided on the fixed seat. The fixed seat slides up and down along the guide column through the sliding hole. When the upper pressure plate of the equipment is pressed down, the fixed seat and the drawing mandrel are driven to move downward. The guide column plays a guiding role to ensure the stability of the up and down movement of the fixed seat.

[0024] Furthermore, in order to further prevent deformation and cracking of the steel pipe when drawing the hole, a first elastic member (not shown in the figure) is provided between the upper clamping die 2 and the upper pressure plate of the equipment, and a second elastic member (not shown in the figure) is provided on the guide column below the fixed seat. Specifically, the first elastic member is set as spring I, and the second elastic member is set as spring II. The upper pressure plate of the equipment presses downward to drive the upper clamping die 2, the drawing mandrel 5, the rear pressure block 6 and the front pressure block 7 to move downward synchronously. When the upper clamping die 2 and the lower clamping die 3 are closed, the drawing mandrel 5, the rear pressure block 6 and the front pressure block 7 just contact the drawing mandrel 5. At this time, the pressure plate of the equipment continues to press downward. Since there is a spring I between the upper clamping die 2 and the upper pressure plate of the equipment, the compression of the spring I does not affect the continued downward pressure of the pressure plate of the equipment. While clamping the steel pipe 8, it can protect the steel pipe 8 from deformation and cracking until the lower surface of the drawing mandrel 5 contacts the inner wall of the steel pipe 8 to complete the drawing.

[0025] It should be noted that the steel pipe drawing hole in this embodiment can be specifically divided into two drawing processes. The specific shapes and structures of the punch 4 and the drawing die 11 used in the two drawing processes are shown in FIG. Figure 2 and Figure 3 As shown, the drawing is performed in two steps, and different punches 11 and drawing dies 11 are used each time to effectively protect the steel pipe 8 and reduce the risk of cracking of the steel pipe.

[0026] It should be noted that the pressure plate on the equipment can be pressed down by a press machine, and the press machine is installed on the equipment.

[0027] In summary, the drawing die in this embodiment has a simple structure, is easy to operate and has low cost. It protects the steel pipe from deformation while drawing the steel pipe, and the manufacturing cost remains unchanged, thereby improving production efficiency and qualified rate.

[0028] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A steel pipe hole drawing die, comprising an upper clamping die mounted on the lower end of a pressure plate on an equipment and a lower clamping die mounted on a base of the equipment, characterized in that: It also includes a drawing mandrel for sleeved steel pipe, the drawing mandrel is slidably connected to the equipment base through a fixed seat, a punch is installed on the drawing mandrel, and a drawing die matching the punch is installed in the lower clamp, the specifications of the punch and the corresponding drawing die are replaced according to the size and shape of the drawing hole required for the steel pipe, and the steel pipe is squeezed multiple times by using punches of multiple specifications and the drawing dies until the steel pipe is drawn out with a drawing hole that meets the requirements of the drawing.

2. The steel pipe hole drawing die according to claim 1, characterized in that: The lower end of the upper pressure plate of the equipment is also equipped with a front pressure block and a rear pressure block for pressing the drawing mandrel, the front pressure block and the rear pressure block are respectively located on both sides of the upper clamp, and a limiting block is provided on the side of the lower clamp close to the fixed seat. A lifting block is also slidably installed on the side of the equipment base away from the fixed seat, and the lifting block can be pushed toward the fixed seat to push the steel pipe to the end face of the limiting block to complete the positioning.

3. The steel pipe hole drawing die according to claim 1, characterized in that: The equipment base is provided with a guide column, the fixing seat is provided with a sliding hole, and the fixing seat slides up and down along the guide column through the sliding hole.

4. The steel pipe hole drawing die according to claim 3, characterized in that: A first elastic member is provided between the upper clamping die and the upper pressure plate of the equipment, and a second elastic member is sleeved on the guide column below the fixing seat.

5. The steel pipe hole drawing die according to claim 4, characterized in that: The first elastic member is configured as spring I, and the second elastic member is configured as spring II.

6. The steel pipe hole drawing die according to claim 2, characterized in that: The end of the drawing mandrel is fixed to the fixing seat by means of bolts.

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