A stainless steel integral stamping overflow ring and method of manufacture

Abstract

The application discloses a stainless steel integral stamping forming overflow ring and a manufacturing method thereof, and relates to the technical field of bathroom accessories. The overflow ring comprises a ring-shaped body, a limiting flange arranged at one end of the ring-shaped body, and a mounting and fixing structure arranged at the other end of the ring-shaped body. The limiting flange is in a flat plate shape or an arc shape. Overflow holes are arranged on the side wall of the ring-shaped body. The ring-shaped body, the overflow holes, the limiting flange and the mounting and fixing structure are integrally stamped and formed by using a stainless steel sheet. All the structures of the application are integrally stamped by using stainless steel, and the application has the advantages of compact and firm structure, high assembly precision, corrosion resistance, environmental protection and no electroplating pollution, is suitable for batch mold production, and has simple working procedures and low cost.

Description

Technical Field

[0001] This invention relates to the field of bathroom accessories technology, and in particular to a stainless steel integral stamping overflow ring and its manufacturing method. Background Technology

[0002] Currently, overflow rings used in basins and sinks on the market are mainly divided into two categories: zinc alloy die-cast overflow rings and plastic electroplated overflow rings.

[0003] After the zinc alloy die-cast overflow ring is formed, it needs to be electroplated. The electroplating process is prone to environmental pollution. Moreover, zinc alloy is prone to corrosion when in contact with water for a long time, which can easily leach heavy metals. It has a short service life and poor safety.

[0004] Plastic electroplated overflow rings are made of plastic as the base material, resulting in low overall structural strength. They are prone to aging and cracking after long-term use, and the surface electroplating layer is easy to peel off. Their hygiene performance and durability are both poor.

[0005] Meanwhile, conventional stainless steel overflow rings are mostly formed by cutting and welding pipes, which involves complex production processes. Welding points are prone to leakage, resulting in low forming precision and poor assembly stability. Existing overflow rings generally rely on electroplating, which has drawbacks such as environmental pollution, susceptibility to corrosion and aging, insufficient structural strength, easy leakage, and cumbersome production processes. Summary of the Invention

[0006] The main objective of this invention is to provide a stainless steel integral stamping overflow ring and its manufacturing method to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides a stainless steel integral stamped overflow ring, comprising an annular body, one end of which is provided with a limiting flange, and the other end is provided with an installation and fixing structure; the limiting flange is flat or arc-shaped; an overflow hole is provided on the side wall of the annular body; the annular body, overflow hole, limiting flange and installation and fixing structure are integrally stamped from a stainless steel sheet.

[0008] Preferably, the stainless steel grade is 201, 304, or 316.

[0009] Preferably, the overflow hole is a round hole, a square hole, an elliptical hole, or an oblong hole.

[0010] Preferably, multiple overflow holes are provided, and the multiple overflow holes are evenly arranged circumferentially along the side wall of the overflow ring body.

[0011] Preferably, the mounting and fixing structure is a mounting buckle.

[0012] Preferably, the mounting and fixing structure is a positioning foot, and multiple positioning feet are provided, with the gap between the multiple positioning feet serving as the overflow hole.

[0013] The present invention also provides a method for manufacturing an overflow ring by integral stamping of stainless steel, comprising the following steps: S1. Material selection and blanking: Select 201, 304 or 316 stainless steel sheet, and use a CNC punching machine to precisely blank the sheet according to the unfolded shape of the product to obtain a flat blank sheet. S2, One-time integral composite stamping: Using a customized one-piece special stamping die, the flat blank sheet is subjected to a single integral composite stamping, and the ring body, limiting flange, overflow hole and bottom mounting and fixing structure are formed in one piece at the same time. S3. Post-processing: Deburring, chamfering, and surface polishing are performed on the stamped workpiece.

[0014] Preferably, in step S2, the customized integrated special stamping die includes an upper die and a composite lower die; The upper punch includes a punch and a pressure ring; The bottom of the punch is provided with a punch column and an annular groove located on the outside of the punch column. The outer diameter of the punch column is adapted to the inner diameter of the annular body, and the annular groove is adapted to the shape of the limiting flange. An overflow hole and a punching clearance hole are provided on the outer wall of the punch column. Both sides of the punch are provided with wing plates, and the bottom of the wing plates is provided with a pressure column with a first inclined surface at the bottom. The outer diameter of the pressure ring is larger than the diameter of the flat blank, and the inner diameter is larger than the outer diameter of the punch; a first guide post is provided on the top of the pressure ring, and a limit head is provided on the top of the first guide post; a first guide hole adapted to the first guide post is provided on the wing plate; a first compression spring is sleeved on the outside of the first guide post; the upper end of the first compression spring abuts against the bottom of the wing plate, and the lower end abuts against the top of the pressure ring. The composite lower mold includes an upper plate and a lower plate; The upper plate has an annular body forming hole in its middle section; the inner diameter of the annular body forming hole matches the inner diameter of the annular body; the top of the upper plate has a flat blank material placement groove; the top edge of the annular body forming hole has an annular protrusion; the annular protrusion matches the shape of the limiting flange; the flat blank material placement groove has a punch edge clearance annular groove located outside the annular protrusion; the bottom edge of the annular body forming hole has a first extrusion chamfer; the upper plate has a through hole that matches the pressure column; the bottom of the upper plate has a second guide post. A punching hole is provided in the middle of the lower plate; a stop hole is provided at the top of the punching hole; a second extrusion chamfer is provided at the top of the stop hole; the inner diameter of the punching hole is adapted to the inner diameter of the annular body; the inner diameter of the stop hole is the same as the inner diameter of the forming hole of the annular body; a second guide hole adapted to the second guide post is provided on the lower plate; a second compression spring is provided in the second guide hole; the top of the second compression spring abuts against the bottom of the second guide post; the bottom of the second compression spring abuts against the bottom of the second guide hole; a second sliding groove is provided on the top of the lower plate; one end of the second sliding groove is connected to the punching hole, and the other end is provided with a tension spring; a side punch is slidably arranged in the second sliding groove; the shape of the side punch is the same as the shape of the overflow hole; the end of the side punch away from the punching hole is connected to the tension spring; the top of the end of the side punch away from the punching hole is provided with a second inclined surface adapted to the first inclined surface; a second sliding groove adapted to the side punch is provided at the bottom of the upper plate; the second sliding groove is connected to the forming hole of the annular body.

[0015] Preferably, the flat blank is first placed into the flat blank placement groove of the composite lower die; then, the upper die presses down, and the pressure ring first presses against the upper plate of the composite lower die, confining the flat blank within the flat blank placement groove; the upper die continues to press down, the first pressure spring begins to compress, the punch presses down, squeezing the flat blank into the annular body forming hole until it reaches the stop hole; the punch continues to press down, entering the blanking hole to achieve bottom blanking and form the annular body; the upper die continues to press down, the first pressure spring of the pressure ring... The inclined surface engages with the second inclined surface of the side punch, thereby driving the side punch to move towards the annular body to punch into the overflow hole punching clearance hole, forming the overflow hole; the punch presses down and enters the punch edge clearance ring groove, forming a limiting flange; as it continues to press down, the second compression spring is compressed, the upper plate and the lower plate fit together, and the first extrusion chamfer and the second extrusion chamfer engage to make clearance, forming a protruding structure for the installation and fixing structure; finally, the overall composite stamping is completed, and the annular body, limiting flange, overflow hole and bottom installation and fixing structure are integrally formed.

[0016] The beneficial effects are as follows: 1. This invention uses stainless steel sheet as a whole for stamping and forming, without welding or splicing gaps, completely eliminating the risk of water leakage from welding, and the overall structure has high strength and is not easily deformed.

[0017] 2. Made of 201, 304, or 316 stainless steel, it is resistant to water corrosion and will not leach heavy metals. Compared with zinc alloys and plastic materials, its service life is greatly improved. It does not require electroplating, is environmentally friendly and pollution-free, and has no problem with electroplating peeling off.

[0018] 3. It is equipped with a limiting flange for easy installation and positioning. It can be used with mounting buckles or positioning feet to achieve quick assembly and ensure a stable installation that is not easy to loosen.

[0019] 4. The overflow hole can be made into various hole shapes and is evenly distributed around the circumference, ensuring smooth overflow and drainage. It is suitable for installation and use in various washbasins and sinks, and has strong versatility. Attached Figure Description

[0020] Figure 1 This is a perspective view of a stainless steel integral stamped overflow ring according to the present invention.

[0021] Figure 2 This is a cross-sectional view of a stainless steel integral stamped overflow ring according to the present invention.

[0022] Figure 3 This is a cross-sectional view of a special stamping die for integrally stamping an overflow ring made of stainless steel according to the present invention.

[0023] Among them, 10-ring body; 11-limiting flange; 12-overflow hole; 13-installation and fixing structure; 100-upper punch, 110-punch, 111-ring groove, 112-overflow hole punching clearance hole, 113-punch post, 114-pressure post, 115-wing plate, 116-first guide hole, 120-pressure ring, 121-first guide post, 122-first compression spring, 123-limiting head; 200-composite lower die, 210-upper plate. 211-Second guide post, 212-Annular body forming hole, 213-First extrusion chamfer, 214-Second slide groove, 216-Plate blank placement groove, 217-Punch edge clearance ring groove, 218-Annular protrusion; 220-Lower plate, 221-Second guide hole, 222-Second compression spring, 223-Second extrusion chamfer, 224-Stop hole, 225-Punching hole, 226-Second slide groove, 227-Side punch, 228-Tension spring. Detailed Implementation

[0024] To achieve the above objectives and effects, the technical means and structure adopted by the present invention will be described in detail with reference to the accompanying drawings, focusing on the features and functions of the preferred embodiments of the present invention.

[0025] like Figure 1-2 As shown, the present invention provides a stainless steel integral stamping overflow ring, which uses 201, 304 or 316 stainless steel sheet as base material, and is integrally stamped in one piece by a special mold, without welding, splicing or electroplating treatment.

[0026] The overflow ring includes an annular body 10. The upper end of the annular body 10 is integrally stamped with a limiting flange 11. The limiting flange 11 is flat or arc-shaped and fits against the outer end face of the basin or sink during installation to limit and stop the movement. The lower end of the annular body 10 is integrally formed with an installation and fixing structure 13. The installation and fixing structure 13 is a mounting buckle or positioning foot, which is convenient for clamping and fixing to the overflow installation position of the basin or sink.

[0027] The annular body 10 has several overflow holes 12 integrally stamped on the side wall. The overflow holes 12 are round, square, elliptical or oblong. The multiple overflow holes 12 are evenly arranged around the side wall of the annular body 10 to ensure uniform overflow and smooth drainage.

[0028] In another embodiment, the mounting and fixing structure 13 is a positioning foot, and multiple positioning feet are provided. The gap between the multiple positioning feet is the overflow hole 12.

[0029] The entire structure of this invention is made by one-piece stamping, resulting in a compact and robust structure with high assembly precision, corrosion resistance, and environmental friendliness without electroplating pollution. It is suitable for mass production of molds, with simple processes and low costs.

[0030] The present invention also provides a method for manufacturing an overflow ring by integral stamping of stainless steel, comprising the following steps: S1. Material selection and blanking: 304 stainless steel cold-rolled sheet is selected and CNC punching machine is used to precisely blank the sheet according to the unfolded outline of the product to obtain a flat blank sheet with regular specifications. S2. One-time integral composite stamping: A customized one-piece special stamping die is used to perform a single integral composite stamping on the flat blank sheet, and simultaneously stretching, punching, flanging and bending to form a ring body 10, a flat plate limiting flanging 11, an oblong overflow hole 12 and a bottom mounting buckle type fixing structure 13. S3. Post-processing: The workpiece after stamping is deburred and the edges are blunted, and then the surface is brushed and polished to remove stamping marks and improve the surface smoothness and texture. No electroplating, spraying or other anti-corrosion and decorative treatments are required. The finished product is one that passes inspection.

[0031] The customized integrated special stamping die used in step S2 includes an upper die 100 and a composite lower die 200. The upper punch 100 includes a punch 110 and a pressure ring 120; the bottom of the punch 110 is provided with a punch post 113 and an annular groove 111 located outside the punch post 113, the outer diameter of the punch post 113 is adapted to the inner diameter of the annular body 10, and the annular groove 111 is adapted to the shape of the flat plate limiting flange 11; an overflow hole punching clearance hole 112 is provided on the outer wall of the punch post 113; wing plates 115 are fixedly provided on both the left and right sides of the punch 110, and a pressure post 114 is vertically provided at the bottom of the wing plate 115, and a first inclined surface is machined at the bottom end of the pressure post 114.

[0032] The outer diameter of the pressure ring 120 is larger than the outer diameter of the flat blank, and the inner diameter of the pressure ring 120 is larger than the outer diameter of the punch 110, ensuring that the pressure ring 120 can float up and down relative to the punch 110. A first guide post 121 is vertically fixed at the top of the pressure ring 120, and a limit head 123 is provided at the top of the first guide post 121. A first guide hole 116 is vertically opened on the wing plate 115 to slide and adapt to the first guide post 121. A first compression spring 122 is sleeved on the outside of the first guide post 121. The upper end of the first compression spring 122 abuts against the bottom surface of the wing plate 115, and the lower end abuts against the top surface of the pressure ring 120, so as to realize the elastic floating and pressing of the pressure ring 120.

[0033] The composite lower mold 200 includes an upper plate 210 and a lower plate 220 that are arranged correspondingly at the top and bottom; The upper plate 210 has a vertically penetrating annular body forming hole 212 in the middle; the inner diameter of the annular body forming hole 212 is adapted to the inner diameter of the annular body 10; the top of the upper plate 210 has a flat blank placement groove 216 around the annular body forming hole 212 for positioning and placing the flat blank; the top edge of the annular body forming hole 212 is provided with an annular protrusion 218; the annular protrusion 218 is adapted to the shape of the limiting flange 11. The flat blank placement groove 216 is also provided with a punch edge clearance annular groove 217, which is located outside the annular protrusion 218 and is used to limit the flange 11 to be stamped and clearance formed; the bottom edge of the annular body forming hole 212 is provided with a first extrusion chamfer 213; the upper plate 210 is provided with a through hole that is adapted to the vertical sliding of the pressure column 114; the bottom of the upper plate 210 is vertically fixed with symmetrically arranged second guide columns 211.

[0034] A punching hole 225 is vertically through the middle of the lower plate 220; a stop hole 224 is coaxially provided at the top of the punching hole 225; a second extrusion chamfer 223 is provided at the top of the stop hole 224; the inner diameter of the punching hole 225 and the inner diameter of the stop hole 224 are the same as the inner diameter of the annular body forming hole 212 and are coaxially provided; a second guide hole 221 is vertically provided on the lower plate 220 to slide and adapt to the second guide post 211; a second compression spring 222 is installed in the second guide hole 221; the top of the second compression spring 222 abuts against the bottom end face of the second guide post 211; the bottom of the second compression spring 222 abuts against the bottom hole wall of the second guide hole 221, so as to realize the elastic floating fit of the upper plate 210.

[0035] The top of the lower plate 220 is provided with a second sliding groove 226; one end of the second sliding groove 226 is connected to the punching hole 225, and the other end is equipped with a tension spring 228; a side punch 227 is horizontally slidably assembled in the second sliding groove 226; the shape of the side punch 227 is consistent with the shape of the elongated oval overflow hole 12; the end of the side punch 227 away from the punching hole 225 is fixedly connected to the tension spring 228; the top of the end of the side punch 227 away from the punching hole 225 is machined with a second inclined surface that matches the first inclined surface; the bottom of the upper plate 210 is provided with a second sliding groove 214 that is adapted to slide with the side punch 227; the inner end of the second sliding groove 214 is connected to the annular body forming hole 212, providing guidance and clearance space for the side punch 227 to punch laterally.

[0036] The specific process of stamping in this invention is as follows: First, the cut flat blank is placed smoothly into the flat blank placement groove 216 of the composite lower die 200. Then, the upper die 100 moves downward with the press, and the pressure ring 120 first contacts and presses against the top surface of the upper plate 210 of the composite lower die 200, firmly restricting the flat blank in the flat blank placement groove 216 to prevent it from shifting during the stamping process. The upper die 100 continues to move downward, and the first compression spring 122 is compressed. The punch 110 drives the punch column 113 to move downward relative to the pressure ring 120, pressing the middle of the flat blank downward into the annular body forming hole 212 until the bottom of the blank reaches the stop hole 224 to achieve stroke limit. The punch column 113 continues to move downward slightly into the punching hole 225 to complete the bottom punching separation of the workpiece, initially forming a cylindrical annular body 10. The upper punch 100 continues to press down, and the pressure column 114 moves down synchronously with the wing plate 115. The first inclined surface at the bottom of the pressure column 114 is in contact with the second inclined surface at the top of the side punch 227, which drives the side punch 227 to overcome the tension of the tension spring 228 and slide horizontally inward along the second slide groove 226. The side punch 227 punches into the side wall of the annular body 10 and is embedded in the overflow hole punching clearance hole 112 on the outer wall of the punch column 113, and punches out the overflow hole 12 that is evenly distributed in the circumference in one go. At the same time, the lower end of the punch 110 is pressed down into the punch edge clearance groove 217, and in conjunction with the annular protrusion 218, it is squeezed and bent to form the upper limiting flange 11 in one piece; as it continues to press down, the second compression spring 222 is compressed and the upper plate 210 moves down relative to the lower plate 220 with the second guide post 211, and the first extrusion chamfer 213 and the second extrusion chamfer 223 cooperate to squeeze and clearance, and the snap-on protrusion structure of the mounting and fixing structure 13 is extruded and formed at the bottom of the annular body 10; thus, a single press can complete the overall composite stamping of the annular body 10, the limiting flange 11, the overflow hole 12 and the bottom mounting and fixing structure 13, realizing the one-piece forming of the entire structure.

[0037] After stamping is completed, the upper die 100 moves upward and resets, the first compression spring 122 and the second compression spring 222 spring back to reset, and the tension spring 228 pulls the side punch 227 backward to reset, so as to facilitate the removal of the formed workpiece and enter the next stamping cycle.

[0038] The above description is only a preferred embodiment of the present invention and not all embodiments. Anyone should know that structural changes made under the guidance of the present invention, and any technical solutions that are the same as or similar to the present invention, are within the protection scope of the present invention.

Claims

1. A stainless steel integral stamped overflow ring, characterized in that, The device includes a ring-shaped body, one end of which is provided with a limiting flange and the other end is provided with an installation and fixing structure; the limiting flange is flat or arc-shaped; an overflow hole is provided on the side wall of the ring-shaped body; the ring-shaped body, the overflow hole, the limiting flange and the installation and fixing structure are integrally stamped from a thin stainless steel sheet.

2. The stainless steel integral stamped overflow ring as described in claim 1, characterized in that, The stainless steel grade is 201, 304 or 316.

3. The stainless steel integral stamped overflow ring as described in claim 1, characterized in that, The overflow hole can be a round hole, a square hole, an elliptical hole, or an oblong hole.

4. The stainless steel integral stamped overflow ring as described in claim 1, characterized in that, The overflow holes are provided in multiple ways, and the multiple overflow holes are evenly arranged along the circumference of the side wall of the overflow ring body.

5. The stainless steel integral stamped overflow ring as described in claim 1, characterized in that, The mounting and fixing structure is a mounting clip.

6. The stainless steel integral stamped overflow ring as described in claim 1, characterized in that, The mounting and fixing structure is a positioning foot, and multiple positioning feet are provided. The gap between the multiple positioning feet is the overflow hole.

7. A method for manufacturing an overflow ring by integral stamping of stainless steel, characterized in that, The method for preparing a stainless steel integral stamped overflow ring as described in any one of claims 1-6 includes the following steps: S1. Material selection and blanking: Select 201, 304 or 316 stainless steel sheet, and use a CNC punching machine to precisely blank the sheet according to the unfolded shape of the product to obtain a flat blank sheet. S2, One-time integral composite stamping: Using a customized one-piece special stamping die, the flat blank sheet is subjected to a single integral composite stamping, and the ring body, limiting flange, overflow hole and bottom mounting and fixing structure are formed in one piece at the same time. S3. Post-processing: Deburring, chamfering, and surface polishing are performed on the stamped workpiece.

8. The method for manufacturing a stainless steel integral stamped overflow ring as described in claim 7, characterized in that, In step S2, the customized integrated special stamping die includes an upper die and a composite lower die; The upper punch includes a punch and a pressure ring; The bottom of the punch is provided with a punch column and an annular groove located on the outside of the punch column. The outer diameter of the punch column is adapted to the inner diameter of the annular body, and the annular groove is adapted to the shape of the limiting flange. An overflow hole and a punching clearance hole are provided on the outer wall of the punch column. Both sides of the punch are provided with wing plates, and the bottom of the wing plates is provided with a pressure column with a first inclined surface at the bottom. The outer diameter of the pressure ring is larger than the diameter of the flat blank, and the inner diameter is larger than the outer diameter of the punch; a first guide post is provided on the top of the pressure ring, and a limit head is provided on the top of the first guide post; a first guide hole adapted to the first guide post is provided on the wing plate; a first compression spring is sleeved on the outside of the first guide post; the upper end of the first compression spring abuts against the bottom of the wing plate, and the lower end abuts against the top of the pressure ring. The composite lower mold includes an upper plate and a lower plate; The upper plate has an annular body forming hole in its middle section; the inner diameter of the annular body forming hole matches the inner diameter of the annular body; the top of the upper plate has a flat blank material placement groove; the top edge of the annular body forming hole has an annular protrusion; the annular protrusion matches the shape of the limiting flange; the flat blank material placement groove has a punch edge clearance annular groove located outside the annular protrusion; the bottom edge of the annular body forming hole has a first extrusion chamfer; the upper plate has a through hole that matches the pressure column; the bottom of the upper plate has a second guide post. A punching hole is provided in the middle of the lower plate; a stop hole is provided at the top of the punching hole; a second extrusion chamfer is provided at the top of the stop hole; the inner diameter of the punching hole is adapted to the inner diameter of the annular body; the inner diameter of the stop hole is the same as the inner diameter of the forming hole of the annular body; a second guide hole adapted to the second guide post is provided on the lower plate; a second compression spring is provided in the second guide hole; the top of the second compression spring abuts against the bottom of the second guide post; the bottom of the second compression spring abuts against the bottom of the second guide hole; a second sliding groove is provided on the top of the lower plate; one end of the second sliding groove is connected to the punching hole, and the other end is provided with a tension spring; a side punch is slidably arranged in the second sliding groove; the shape of the side punch is the same as the shape of the overflow hole; the end of the side punch away from the punching hole is connected to the tension spring; the top of the end of the side punch away from the punching hole is provided with a second inclined surface adapted to the first inclined surface; a second sliding groove adapted to the side punch is provided at the bottom of the upper plate; the second sliding groove is connected to the forming hole of the annular body.

9. A method for manufacturing a stainless steel integral stamped overflow ring as described in claim 8, characterized in that, In step S2, the flat blank is first placed into the flat blank placement groove of the composite lower die; then, the upper die presses down, and the pressure ring first presses against the upper plate of the composite lower die, confining the flat blank within the flat blank placement groove; the upper die continues to press down, the first compression spring begins to compress, and the punch presses down, squeezing the flat blank into the annular body forming hole until it reaches the stop hole; the punch continues to press down, entering the punching hole to achieve bottom punching and form the annular body; the upper die continues to press down, and the pressure ring... A beveled surface engages with the second beveled surface of the side punch, thereby driving the side punch to move towards the annular body and punch into the overflow hole punching clearance hole to form an overflow hole; the punch presses down and enters the punch edge clearance ring groove to form a limiting flange; as it continues to press down, the second compression spring is compressed, the upper plate and the lower plate fit together, and the first extrusion chamfer and the second extrusion chamfer engage to form a protruding structure for mounting and fixing; finally, the overall composite stamping is completed, and the annular body, limiting flange, overflow hole and bottom mounting and fixing structure are integrally formed.

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