Bulging die

Abstract

The utility model relates to the field of metal forming tools, in particular to a bulging die which is provided with an annular spring and a slidable flaring block, when a metal pipe fitting is flared, the flaring block is pushed by a stamping rod to expand outwards, and the annular spring is stretched to counteract part of stamping force, so that the metal pipe fitting is flared. Punching force is evenly transmitted to the pipe wall of the metal pipe fitting, local stress concentration is avoided, and the crack risk of the metal pipe fitting is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal forming tool field, concretely relates to an expansion die. BACKGROUND

[0002] The pipe diameter of the metal pipe is usually expanded by the expansion die, and the pipe diameter of the metal pipe is expanded radially outward under the action of pressure. However, the existing expansion die usually drives a punch head with a larger diameter to extend into the pipe for stamping, so as to achieve the purpose of flaring the pipe. However, such a design is prone to cause local stress concentration of the pipe wall of the metal pipe, and there is a risk of cracking. SUMMARY

[0003] The utility model discloses a technical scheme for solving the technical problems is provided with an expansion die, which comprises:

[0004] The flaring sleeve is provided with a cavity one inside, the cavity wall of the cavity one is connected with a plurality of installation through grooves, the installation through groove is slidably provided with a flaring block, the flaring block comprises a main body and an inner inclined surface provided on the main body and close to the central axis of the cavity one on one side, and the outer side wall of the flaring block is provided with an annular spring, which is used for limiting the flaring block and resetting the flaring block.

[0005] The top rod is connected with the output end of the hydraulic tool, the top rod is coaxially fixed with a stamping rod, one end of the inner inclined surface away from the stamping rod is closer to the central axis of the cavity one than one end of the inner inclined surface close to the stamping rod, and the hydraulic tool drives the stamping rod to push the inner inclined surface of the flaring block to move away from the central axis of the cavity one and protrude from the installation through groove.

[0006] Further, the flaring block further comprises a horizontal part provided on the main body away from the stamping rod, the horizontal part is arranged along the sliding direction of the flaring block, and one end of the horizontal part away from the central axis of the cavity one is provided with a protrusion.

[0007] Further, the stamping rod is provided with an outer taper surface one, the taper angle of the outer taper surface one is matched with the inclination angle of the inner inclined surface, and the diameter of one end of the stamping rod close to the output end of the hydraulic tool is greater than the diameter of one end of the stamping rod away from the output end of the hydraulic tool.

[0008] Further, the flaring sleeve is coaxially provided with a connecting sleeve, and the connecting sleeve is connected with the C-shaped head of the hydraulic tool.

[0009] Further, the installation through grooves are circumferentially distributed about the central axis of the flaring sleeve.

[0010] Further, the cavity wall of the cavity one is provided with a cavity two, the stamping rod is coaxially provided with a material return rubber sleeve, and the stamping rod drives the material return rubber sleeve to abut against the cavity wall of the cavity two.

[0011] Further, the top rod is coaxially provided with a mounting ring groove, and the mounting ring groove is provided with an elastic retaining ring.

[0012] Further, the bulging die is used for hydraulic tools.

[0013] The utility model discloses beneficial effect is: the utility model discloses through setting up annular spring and slidable flaring block, when flaring metal pipe fittings, through the punch rod and push flaring block to expand outward simultaneously, annular spring stretches, offsets part of the stamping force, makes the stamping force even transmission to the pipe wall of metal pipe fittings, avoids local stress concentration, reduces the crack risk of metal pipe fittings. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further described below in connection with the drawings and examples.

[0015] In the drawings: Figure 1 It is the overall structural drawing of the bulging die provided in the utility model embodiment;

[0016] Figure 2 It is Figure 1 The top view of the bulging die shown in the figure;

[0017] Figure 3 It is Figure 2 The A-A section view of the bulging die shown in the figure;

[0018] Figure 4 It is Figure 3 The enlarged view of A in the figure;

[0019] Figure 5 It is Figure 1 The explosion view of the bulging die shown in the figure.

[0020] Mark explanation: 100, bulging die, 10, flaring sleeve, 11, cavity one, 111, cavity two, 12, installation through groove, 13, flaring block, 131, C groove, 132, main body, 133, inner inclined surface, 134, horizontal part, 135, protrusion, 14, annular spring, 15, connecting sleeve, 20, top rod, 21, punch rod, 211, outer taper surface two, 212, material return rubber sleeve, 213, outer taper surface one, 22, mounting ring groove, 23, elastic retaining ring, 24, connecting hole. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer, the utility model will be described in detail in combination with the drawings. The drawing is a simplified schematic diagram, and only illustrates the basic of the utility model in a schematic manner, and therefore only shows the structure related to the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] Please refer to Figures 1-5 , provide a bulging die 100, including flaring sleeve 10 and ejector rod 20.

[0023] The flaring sleeve 10 is provided with cavity one 11, and the cavity wall of cavity one 11 is communicated with a plurality of installation through slot 12, the installation through slot 12 is slidably provided with flaring block 13, the outer side wall of flaring block 13 is provided with annular spring 14, and the annular spring 14 is used for limiting flaring block 13 and resetting flaring block 13. Further, in the embodiment, the installation through slot 12 is circumferentially distributed about the center axis of the flaring sleeve 10, and the outer side wall of the flaring block 13 is provided with a C-shaped groove 131 matched with the annular spring 14.

[0024] The flaring block 13 comprises a main body 132, an inner inclined surface 133 provided on the main body 132 and close to the central axis of the cavity one 11 on one side, and a horizontal part 134 provided on the main body 132 and away from the end of the stamping rod 21. The end of the inner inclined surface 133 away from the stamping rod 21 is closer to the central axis of the cavity one 11 than the end of the inner inclined surface 133 close to the stamping rod 21, the horizontal part 134 is arranged along the sliding direction of the flaring block 13, and the end of the horizontal part 134 away from the central axis of the cavity one 11 is provided with a protrusion 135. The arrangement of the horizontal part 134 and the protrusion 135 improves the strength of the flaring block 13, and facilitates the flaring block 13 to expand the pipe diameter of the metal pipe.

[0025] The output end of the hydraulic tool is connected with the ejector rod 20, the stamping rod 21 is coaxially fixed on the ejector rod 20, the hydraulic tool drives the stamping rod 21 to push the inner inclined surface 133 of the flaring block 13 to move away from the central axis of the cavity one 11, and the protrusion 135 is arranged in the installation through slot 12. Specifically, in the embodiment, the output end of the hydraulic tool is fixedly connected with the ejector rod 20. The end of the stamping rod 21 connected with the ejector rod 20 is provided with an outer conical surface two 211, the ejector rod 20 is provided with a connecting hole 24 connected with the stamping rod 21, and the stamping rod 21 and the ejector rod 20 are connected by the outer conical surface two 211.

[0026] When the metal pipe is flared, the end of the flaring sleeve 10 is inserted into the inside of the metal pipe, and the output end of the hydraulic tool controls the movement of the stamping rod 21 until the plurality of flaring blocks 13 are pushed outward to expand, and the flaring blocks 13 push the wall of the metal pipe to deform, thereby increasing the diameter of the metal pipe.

[0027] By setting the annular spring and the slidable flaring block 13, when the metal pipe is flared, the annular spring 14 is stretched while the flaring block 13 is pushed outward to expand by the stamping rod 21, which offsets part of the stamping force and makes the stamping force evenly transmitted to the wall of the metal pipe, avoiding local stress concentration and reducing the risk of cracks in the metal pipe. After the flaring is completed, the annular spring 14 resets and drives the flaring block 13 to reset.

[0028] Further, the stamping rod 21 is provided with an outer taper surface 213, the inclination angle of the outer taper surface 213 is matched with the inclination angle of the inner inclined surface 133, and the diameter of one end of the stamping rod 21 close to the output end of the hydraulic tool is larger than the diameter of the other end of the stamping rod 21 away from the output end of the hydraulic tool. The end of the stamping rod 21 cooperates with the flaring block 13 to facilitate the stamping rod 21 to push the flaring block 13 outward along the side wall of the cavity one 11 close to one end of the flaring block 13.

[0029] Further, the flaring sleeve 10 is coaxially provided with a connecting sleeve 15, and the connecting sleeve 15 is connected with the C-shaped head of the hydraulic tool. Specifically, in the embodiment, the connecting sleeve 15 and the C-shaped head are threadedly connected.

[0030] Further, the cavity wall of the cavity one 11 is provided with a cavity two 111, and the stamping rod 21 is coaxially provided with a material return rubber sleeve 212, and the stamping rod 21 drives the material return rubber sleeve 212 to abut against the cavity wall of the cavity two 111. When the output end of the hydraulic tool pushes the stamping rod 21 to push the flaring block 13 to expand, the material return rubber sleeve 212 abuts against the cavity wall of the cavity two 111, and the material return rubber sleeve 212 is compressed. After the expansion is completed, the material return rubber sleeve 212 resets to facilitate the reset of the stamping rod 21.

[0031] Further, the top rod 20 is coaxially provided with a mounting ring groove 22, and the mounting ring groove 22 is provided with an elastic retaining ring 23. Specifically, in the embodiment, the elastic retaining ring 23 is an axial elastic retaining ring 23, and the setting of the elastic retaining ring 23 can improve the stability of the connection between the stamping rod 21 and the top rod 20, and prevent the top rod 20 from producing axial displacement relative to the stamping rod 21.

[0032] Further, the bulging die 100 described in the above embodiment is used on the hydraulic tool shown in Figure 6 of the Chinese Utility Model Patent with Publication No. CN213002255U.

Claims

1. An expansion die characterized in that, The utility model relates to a kind of hydraulic tool and its expansion die, including: Flared sleeve, the cavity one is arranged in the flared sleeve, the cavity wall of the cavity one is communicated with several installation through slot, the flared sleeve is slidably arranged in the installation through slot, the flared sleeve includes main body and the inner inclined surface of being arranged on main body and being close to the axis of cavity one one side, the outer side wall of the flared sleeve is sleeved with annular spring, the annular spring is used to limit flared sleeve and make flared sleeve reset; The top rod is connected with the output end of hydraulic tool, the stamping rod is coaxially fixed on the top rod, the end of the inner inclined surface away from the stamping rod is closer to the central axis of cavity one than the end of the inner inclined surface close to the stamping rod, and the stamping rod is driven by hydraulic tool to push the inner inclined surface of flared sleeve to move in the direction away from the central axis of cavity one, and the installation through slot is protruded.

2. The expansion die of claim 1, wherein: The flared sleeve further includes horizontal part arranged on the end of main body away from the stamping rod, the horizontal part is arranged along the sliding direction of flared sleeve, and the end of the horizontal part away from the central axis of cavity one is provided with protrusion.

3. The expansion die of claim 2, wherein: The outer taper surface one is arranged on the stamping rod, the oblique angle of the outer taper surface one is matched with the inclination angle of inner inclined surface, and the diameter of the end of the stamping rod close to the output end of hydraulic tool is greater than the diameter of the end of the stamping rod away from the output end of hydraulic tool.

4. The expansion die of claim 1, wherein: The flared sleeve is coaxially provided with connecting sleeve, and the connecting sleeve is connected with the C-shaped head of hydraulic tool.

5. The expansion die of claim 1, wherein: The installation through slot is circumferentially distributed about the central axis of flared sleeve.

6. The expansion die of claim 1, wherein: The cavity wall of the cavity one is provided with cavity two, the stamping rod is coaxially provided with material return rubber sleeve, and the stamping rod drives material return rubber sleeve to abut against the cavity wall of cavity two.

7. The expansion die of claim 1, wherein: The top rod is coaxially provided with installation ring groove, and the installation ring groove is provided with elastic retaining ring.

8. The expansion die of any one of claims 1-7, wherein: The bulging die is used for hydraulic tool.

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