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CN-121972528-A - Spittoon extrusion forming process and die structure for small-caliber shell cartridge

CN121972528ACN 121972528 ACN121972528 ACN 121972528ACN-121972528-A

Abstract

The invention provides a spittoon extrusion forming process and a die structure for a small-caliber shell cartridge, which relate to the technical field of metal plastic processing and comprise the following steps of (1) blanking a bar, (2) phosphating and saponifying the blanked blank, (3) placing the processed blank into a multi-station integrated forming die for one-time extension, (4) completing whole-bottom extrusion forming in the same die to obtain a spittoon finished product, wherein the extrusion forming is carried out at normal temperature without heating treatment, and the blank is made of low-carbon steel or brass material. When the blank is low carbon steel, the extrusion speed is 5-10 mm/s, the extrusion ratio is 3-6, the extrusion pressure is 800-1000 MPa, when the blank is brass, the extrusion speed is 10-15 mm/s, the extrusion ratio is 8-10, and the extrusion pressure is 300-500 MPa. The invention has the advantages of high production efficiency, cost saving, high product precision, stable and reliable quality, strong universality, wide application prospect and the like.

Inventors

  • LIU JIEFENG
  • MA XIAOHU
  • Pu Shisong

Assignees

  • 深圳市前沿材料技术有限公司

Dates

Publication Date
20260505
Application Date
20260123

Claims (10)

  1. 1. The spittoon extrusion forming process for the small-caliber shell cartridge is characterized by comprising the following steps of: (1) Blanking the bar stock; (2) Phosphating and saponifying the blanks after blanking; (3) Placing the processed blank into a multi-station integrated forming die for one-time extension; (4) And (5) finishing whole-bottom extrusion forming in the same die to obtain a finished spittoon product.
  2. 2. The extrusion process of claim 1, wherein the extrusion is performed at ambient temperature without heat treatment.
  3. 3. The extrusion process of claim 1, wherein the billet is a mild steel or brass material.
  4. 4. The extrusion process of claim 3 wherein: When the blank is low carbon steel, the extrusion speed is 5-10 mm/s, the extrusion ratio is 3-6, and the extrusion pressure is 800-1000 MPa; When the blank is brass, the extrusion speed is 10-15 mm/s, the extrusion ratio is 8-10, and the extrusion pressure is 300-500 MPa.
  5. 5. An extrusion die for implementing the process of any one of claims 1 to 4, wherein the die has a multi-station integrated structure, and comprises a stretching station and a full-bottom extrusion station which are sequentially arranged so as to continuously complete the stretching and full-bottom extrusion processes on the same equipment.
  6. 6. The extrusion die of claim 5, wherein the extension station comprises a first male die and a first female die, the whole-bottom extrusion station comprises a second male die and a second female die, the first female die and the second female die are respectively provided with a die cavity for accommodating blanks, the head working ends of the first male die and the second male die are respectively provided with a forming bevel, and the forming bevel is 30-40 degrees.
  7. 7. The extrusion die of claim 6, wherein the whole-bottom extrusion station further comprises a top material cylinder and a push rod, wherein the top material cylinder is arranged right below a cavity of the second female die, and a lower male die for extrusion forming of the cavity at the bottom of the spittoon is arranged on the top material cylinder; the stretching station further comprises a material ejection rod, wherein the material ejection rod is arranged below the cavity of the first female die and used for ejecting the semi-finished workpiece after the stretching process.
  8. 8. The extrusion die of claim 7 wherein the working surfaces of the first and second punches are provided with PVD coatings.
  9. 9. The extrusion die of claim 8 wherein the matrix of the die is made of alloy tool steel or cemented carbide material.
  10. 10. Extrusion die according to any of claims 6 to 9, wherein the die is adapted for the integral formation of small or large caliber shell cartridge spittoos.

Description

Spittoon extrusion forming process and die structure for small-caliber shell cartridge Technical Field The invention relates to the technical field of metal plastic processing, in particular to a spittoon extrusion forming process and a die structure for a small-caliber shell cartridge. Background At present, the spittoon forming of the small-caliber shell cartridge mainly adopts the traditional multi-process intermittent production process, as shown in fig. 1, and the process flow generally comprises the steps of blanking, cake forging, primary extension, annealing heat treatment, phosphating saponification treatment, secondary extension, re-annealing heat treatment, phosphating saponification treatment, whole bottom extrusion and the like. However, the conventional process has the technical defects that firstly, the process is complex, the production efficiency is low, each blank needs to be subjected to multiple times of heating treatment, surface treatment and die positioning, the inter-process connection depends on manual operation, the production rhythm is slow, and the efficiency is low. Secondly, the material utilization rate is low, the energy consumption is high, the surface of the blank is seriously oxidized due to repeated heating, the material loss is large, and the energy consumption is particularly obvious. Then, the forming precision is poor, the quality is unstable, the dimensional fluctuation is caused by repeated mold entering and heating, the product precision is low, the surface quality is poor, and the mechanical properties of key parts are uneven. Also, the die life is short, the maintenance cost is high, frequent heat treatment and extrusion lead to increased die wear, reduced life, increased maintenance frequency and cost. Finally, environmental pollution and working environment are poor, a large number of heat treatment and surface treatment procedures bring serious environmental pollution, and meanwhile, the production environment is bad, so that the automation and intelligent transformation are not facilitated. In order to solve the above problems, a novel extrusion process and a novel die structure are needed to realize efficient, precise and environment-friendly production of small-caliber shell cartridge spittoon. Disclosure of Invention The invention overcomes the defects in the prior art, provides the spittoon extrusion forming process and the die structure for the small-caliber shell cartridge, and has the advantages of high production efficiency, cost saving, high product precision, stable and reliable quality, strong universality, wide application prospect and the like. In order to solve the technical problems, the invention is realized by the following technical scheme: A spittoon extrusion process for a small caliber shell cartridge, comprising the steps of: (1) Blanking the bar stock; (2) Phosphating and saponifying the blanks after blanking; (3) Placing the processed blank into a multi-station integrated forming die for one-time extension; (4) And (5) finishing whole-bottom extrusion forming in the same die to obtain a finished spittoon product. Further, the extrusion molding is performed at normal temperature without heat treatment. Still further, the blank is a mild steel or brass material. Further, when the blank is low carbon steel, the extrusion speed is 5-10 mm/s, the extrusion ratio is 3-6, and the extrusion pressure is 800-1000 MPa; When the blank is brass, the extrusion speed is 10-15 mm/s, the extrusion ratio is 8-10, and the extrusion pressure is 300-500 MPa. The extrusion forming die for realizing the process is of a multi-station integrated structure and comprises a stretching station and a whole bottom extrusion station which are sequentially arranged so as to continuously complete the stretching and whole bottom extrusion procedures on the same equipment. Furthermore, the extension station comprises a first male die and a first female die, the whole-bottom extrusion station comprises a second male die and a second female die, the first female die and the second female die are respectively provided with a cavity for accommodating blanks, the head working ends of the first male die and the second male die are respectively provided with a forming bevel, and the forming bevel is 30-40 degrees. The whole-bottom extrusion station further comprises a top material cylinder and a push rod, wherein the top material cylinder is arranged right below a cavity of the second female die, and a lower male die for extrusion forming of an inner cavity at the bottom of the spittoon is arranged on the top material cylinder; the stretching station further comprises a material ejection rod, wherein the material ejection rod is arranged below the cavity of the first female die and used for ejecting the semi-finished workpiece after the stretching process. Further, the working surfaces of the first male die and the second male die are provided with PVD coatings. Still further,