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CN-224208905-U - Stainless steel pipe surface pattern water swelling forming die

CN224208905UCN 224208905 UCN224208905 UCN 224208905UCN-224208905-U

Abstract

The utility model relates to the technical field of processing of stainless steel pipe fittings and discloses a water-swelling forming die for patterns on the surface of a stainless steel pipe fitting, wherein the diameter of a swelled steel pipe placed in the die is 80% -90% of the diameter of a final product, the die comprises an upper die assembly and a lower die assembly, the upper die assembly comprises an upper die plate, a first heightening block, a first mandrel seat and a sleeve, and the lower die assembly comprises a lower die plate, a second heightening block, a supporting plate, a cavity, a second mandrel seat, a first spring clamp, a second spring clamp and a mandrel. The welding line is required to be thrown before the die disclosed by the utility model is adopted to bulge a product, and the process adopted by the die disclosed by the utility model is a one-time bulging process, so that the bulging amplitude is small, the welding line is not easy to crack, and the problem of high defect of one-time bulging can be effectively solved.

Inventors

  • CAI WANJUN
  • HE XIAOJUN

Assignees

  • 广东木森日用品有限公司

Dates

Publication Date
20260508
Application Date
20250122

Claims (8)

  1. 1. The water swelling forming die for the pattern on the surface of the stainless steel pipe fitting is characterized in that the diameter of a bulging steel pipe placed in the die is 80% -90% of the diameter of a final product, and the die comprises an upper die assembly and a lower die assembly; The upper die assembly comprises an upper die plate, a heightening block I, a core rod seat I and a sleeve, wherein the heightening block I is fixedly connected to the lower part of the upper die plate, the sleeve is fixedly connected to the lower part of the heightening block I, the top of the core rod seat I is provided with a horizontally extending end head I, and the end head I is matched with a circular limit groove I at the upper part of the inner side of the heightening block I to form limit of the core rod seat I in the heightening block I; The lower die assembly comprises a lower die plate, a heightening block II, a supporting plate, a cavity, a mandrel holder II, a first spring clamp, a second spring clamp and a mandrel, wherein the heightening block II is fixedly connected above the lower die plate and is of an integrated structure, the heightening block II is divided into a first section, a second section and a third section from bottom to top, the outer diameter of the first section is largest, the outer diameter of the second section is smallest, the supporting plate is arranged on the outer ring of the second section and is supported by the top surface of the first section, the cavity is provided with a plurality of grooves which are circumferentially arranged to form a whole, the sleeve is sleeved outside the cavity, the bottom end of the cavity is embedded in a space formed between the top surface of the supporting plate and the bottom surface of the third section, when the upper die assembly is used for pressing down, the sleeve is matched with the cavity to enable the cavity to be folded inwards, the inner surface of the cavity is provided with a processing pattern, the bottom of the mandrel holder II is provided with a second end of a horizontal extension, the end of the second head is matched with a circular limiting groove II on the lower part of the heightening block II, the second section is formed by the top surface of the outer diameter of the first section, the sleeve is arranged on the bottom surface of the second section, the first spring clamp is matched with the second spring clamp, the first mandrel is matched with the second end of the second core rod, the second spring clamp is matched with the second core rod, the second end of the second cavity is matched with the second water-shaped core rod is matched with the second cavity, and the first mandrel is matched with the second cavity, and the second cavity and the upper end and the cavity and the lower mandrel is matched with the cavity.
  2. 2. The pattern water swelling forming die for the surface of the stainless steel pipe fitting according to claim 1, wherein the swelling amplitude of the swelled steel pipe is increased by 10-20% by the pipe section diameter.
  3. 3. The stainless steel pipe fitting surface pattern water swelling forming die according to claim 1, wherein the upper template, the heightening block I and the sleeve are integrally connected and fixed by a plurality of screws I.
  4. 4. The stainless steel pipe fitting surface pattern water swelling forming die according to claim 1, wherein the lower die plate and the heightening block II are integrally connected and fixed through a plurality of screws II.
  5. 5. A stainless steel tubular surface pattern water swelling forming die according to claim 1, wherein the working pattern on the inner surface of the cavity is a pit pattern or a relief pattern.
  6. 6. The stainless steel pipe fitting surface pattern water swelling forming die according to claim 1, wherein the thickness of the first end head is smaller than the groove depth of the first circular limiting groove, and the thickness of the second end head is smaller than the groove depth of the second circular limiting groove.
  7. 7. A stainless steel pipe fitting surface pattern water swelling forming die according to claim 1, wherein the outer surface of the die cavity is provided with an inclined surface matched with the inner wall of the sleeve.
  8. 8. The pattern water swelling forming die for the surface of the stainless steel pipe fitting according to any one of claims 1 to 7, wherein when the pattern water swelling forming die is installed, the upper die plate and the lower die plate are respectively limited by locking die locking angle irons arranged on the die fixing plates of the bulging machine table above and below, and each die locking angle iron is fixedly connected to the die fixing plates of the bulging machine table by corresponding screws.

Description

Stainless steel pipe surface pattern water swelling forming die Technical Field The utility model relates to the technical field of stainless steel pipe fitting machining, in particular to a water swelling forming die for a pattern on the surface of a stainless steel pipe fitting. Background The forming process of the stainless steel cup body pattern is usually roll forming and water expansion forming, the roll forming is difficult, pattern connection is difficult to control, if the common water expansion forming is carried out at one time, in order to ensure the appearance of the welding seam of a pipe, the welding seam is thrown before the expansion of the expanded pipe, but the welding seam is easy to break, poor and high in cost due to the large expansion amplitude of the one-time forming during the expansion. If the welding line is expanded twice, namely, the welding line is firstly polished, then the welding line is expanded once to 80% -90% of the diameter of the product, and then the surface pattern is expanded twice and the welding line is expanded to the diameter of the final product, the secondary expansion product has the defects of more working procedures and higher cost. Therefore, it is necessary to provide a mold which can realize one-time forming and solve the problems of easy breakage, high defect and high cost of the weld joint caused by one-time forming. Disclosure of utility model In view of the above, the utility model provides a stainless steel pipe surface pattern water swelling forming die, which has the following specific technical scheme: the surface pattern water swelling forming die for the stainless steel pipe comprises an upper die assembly and a lower die assembly, wherein the diameter of a swelling steel pipe placed in the die is 80% -90% of the diameter of a final product; The upper die assembly comprises an upper die plate, a heightening block I, a core rod seat I and a sleeve, wherein the heightening block I is fixedly connected to the lower part of the upper die plate, the sleeve is fixedly connected to the lower part of the heightening block I, the top of the core rod seat I is provided with a horizontally extending end head I, and the end head I is matched with a circular limit groove I at the upper part of the inner side of the heightening block I to form limit of the core rod seat I in the heightening block I; The lower die assembly comprises a lower die plate, a heightening block II, a supporting plate, a cavity, a mandrel holder II, a first spring clamp, a second spring clamp and a mandrel, wherein the heightening block II is fixedly connected above the lower die plate and is of an integrated structure, the heightening block II is divided into a first section, a second section and a third section from bottom to top, the outer diameter of the first section is largest, the outer diameter of the second section is smallest, the supporting plate is arranged on the outer ring of the second section and is supported by the top surface of the first section, the cavity is provided with a plurality of grooves which are circumferentially arranged to form a whole, the sleeve is sleeved outside the cavity, the bottom end of the cavity is embedded in a space formed between the top surface of the supporting plate and the bottom surface of the third section, when the upper die assembly is used for pressing down, the sleeve is matched with the cavity to enable the cavity to be folded inwards, the inner surface of the cavity is provided with a processing pattern, the bottom of the mandrel holder II is provided with a second end of a horizontal extension, the end of the second head is matched with a circular limiting groove II on the lower part of the heightening block II, the second section is formed by the top surface of the outer diameter of the first section, the sleeve is arranged on the bottom surface of the second section, the first spring clamp is matched with the second spring clamp, the first mandrel is matched with the second end of the second core rod, the second spring clamp is matched with the second core rod, the second end of the second cavity is matched with the second water-shaped core rod is matched with the second cavity, and the first mandrel is matched with the second cavity, and the second cavity and the upper end and the cavity and the lower mandrel is matched with the cavity. Preferably, the bulging amplitude of the bulging steel tube is increased by 10-20% by the diameter of the tube section. Preferably, the upper template, the first heightening block and the sleeve are integrally connected and fixed by a plurality of first screws. Preferably, the lower template and the second heightening block are integrally connected and fixed by a plurality of second screws. Preferably, the processing pattern on the inner surface of the cavity is a concave pattern or a convex pattern. Preferably, the thickness of the first end is smaller than the groove depth of the first