CN111872637A

CN111872637A - Extrusion forming process of stainless steel water warming foot

Info

Publication number: CN111872637A
Application number: CN202010714327.0A
Authority: CN
Inventors: 蔡丰良
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2020-11-03

Abstract

The invention discloses an extrusion forming process of a stainless steel water warming foot, which comprises the following steps: preparing a stainless steel pipe; step two: laser cutting; step three: flaring the pipe blank; step four: turning the pipe blank; step five: bending and forming; step six: flattening and forming; step seven: rolling the threads; compared with the existing production process of cast iron bent feet, the extrusion forming process of the water heating bent feet avoids the serious problems of high energy consumption, high pollution, low productivity and unstable quality of the traditional casting process production mode.

Description

Extrusion forming process of stainless steel water warming foot

Technical Field

The invention relates to the field of manufacturing of eccentric reducing pipes, in particular to an extrusion forming process of a stainless steel water warming bend pin.

Background

The press forming is a processing and forming method for obtaining a workpiece with a required shape or size by applying an external force to a plate, a strip, a pipe, a section and the like by a press machine and a die to cause plastic deformation or separation. The main steps of stamping are hot rolling and cold rolling, 60-70% of all the world steels are plates, and most of the plates are made into finished products through stamping. The stamping die is a special process device for processing materials into parts in cold stamping processing, and becomes the cold stamping die.

At present, bathroom products are increasing day by day, and the foot that curves is as tap's main accessory, and its quality problem directly influences tap's whole life-span, and the foot that curves plays the effect between connecting tube and the tap, bears the weight of whole set of tap under normal installation, and through long-time expend with heat and contract with cold, with alkaline material outstanding and material oxidation, causes the life-span of the foot that curves to shorten to influence whole tap life-span. The casting process of the existing curved foot comprises the following steps: the method comprises the steps of profiling manufacturing, wax mold pressing, wax mold assembling, paint dipping, sand spreading, repeated hardening and drying, dewaxing, modeling, roasting, burning, sand shakeout and cleaning, is limited in absolute sound of the process, and the finished product of the bent foot has defects of pits, depressions, sand inclusion and the like on the surface, influences the appearance of the product and reduces the performance and yield of the product. The production process has higher requirements on a production method, relatively difficult casting, serious pollution, low productivity, very serious energy consumption and unstable quality, and the incomplete sealing performance of the thread defects is often seriously influenced when the threads at the two ends of the curved foot are finally manufactured.

The Chinese patent application No. 201210538622.0 entitled "extrusion moulding method of curved foot joint" discloses an extrusion moulding method of curved foot joint, which utilizes stainless steel tube to process it to obtain final stainless steel curved foot, compared with the existing cast iron curved foot, the production flow of the method is more in line with the way of scientific development, and the method is more in line with the benefit of the relative production method; at present, a plurality of manufacturers adopt similar methods to manufacture stainless steel bent feet, but bending of a stainless steel pipe is one of the problems which restrict the process of manufacturing the bent feet by the stainless steel pipe, a plurality of dies are required to mold the bent feet in the production process, but the quality is often not guaranteed, and the bent feet are very easy to be influenced, so that the defective rate is increased.

Disclosure of Invention

In order to achieve the purpose, the invention adopts the following technical scheme: an extrusion forming process of a stainless steel water warming foot is characterized in that: the method comprises the following steps:

the method comprises the following steps: preparing a stainless steel pipe;

step two: the stainless steel pipe is cut into pipe blanks with the same length by laser, and the length difference is kept between 1 mm; step three: polishing the cut to remove burrs, then flaring the pipe blank by using a punch, and selecting the flaring size according to the actual required aperture;

step four: turning the middle of the pipe blank after the flaring is finished, removing redundant parts and processing the outline of the pipe blank into a preset size;

step five: after turning in the fourth step, the contour of the tube blank is kept consistent, the tube blank is placed into a bending die, a hydraulic press is operated to bend, and the bending eccentric distance can be adjusted within a reasonable range according to the actual requirement of a bent pin;

step six: after the bending forming in the step five is finished, taking out the semi-finished product bent foot, putting the semi-finished product bent foot into a flattening die, and operating a hydraulic press to shape and flatten the middle section of the semi-finished product bent foot;

step seven: taking the bent pin out of the flattening die, carrying out external thread rolling on two ends of the bent pin, and carrying out surface burr treatment to obtain the finished stainless steel bent pin.

Preferably, the turning of the tube blank in the fourth step is mainly to keep the tube blank with small-amplitude deformation consistent after cutting and flaring, and is convenient for the fifth step.

Preferably, the bending die in the fifth step is provided with a mandrel for fastening the tube blank before bending and inserting the mandrel into the inner hole of the tube blank for shaping.

Preferably, the flattening die in the sixth step is provided with a core rod with the same shape as the inner hole of the finished curved pin, and the core rod is driven by the hydraulic press to extend into the inner hole of the curved pin to be processed before being pressed so as to position the flattened shape.

Preferably, the shape of the mandrel is the same as the inner hole structure of the forming tube blank related to the step.

Has the advantages that: the invention discloses an extrusion forming process of a stainless steel water warming foot, which comprises the following steps: preparing a stainless steel pipe; step two: laser cutting; step three: flaring the pipe blank; step four: turning the pipe blank; step five: bending and forming; step six: flattening and forming; step seven: rolling the threads; compared with the existing production process of cast iron bent feet, the extrusion forming process of the water heating bent feet avoids the serious problems of high energy consumption, high pollution, low productivity and unstable quality of the traditional casting process production mode.

Drawings

FIG. 1 is a schematic view of a raw tube blank according to the present embodiment;

FIG. 2 is a schematic view of the tube blank after the flaring step is completed according to the present embodiment;

FIG. 3 is a schematic view of the tube blank after the bending step is completed according to the present embodiment;

FIG. 4 is a schematic view of the tube blank after the flattening step of the present embodiment;

FIG. 5 is a schematic view of the finished curved leg of the present solution;

fig. 6 is a schematic diagram illustrating an example of a structure of a flattening and sizing mandrel used in the process flow of the steps of the present embodiment.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 6, the scheme discloses an extrusion forming process of a stainless steel water heating bent pin, which is characterized in that: the method comprises the following steps:

the method comprises the following steps: a stainless steel pipe, preferably 304 or 201 stainless steel;

step two: cutting a stainless steel pipe by using a laser cutting machine, and dividing the stainless steel pipe into pipe blanks with the same length, wherein the length difference is kept between 50 and 51 mm; (as shown in FIG. 1)

Step three: polishing and deburring the cut notches at the two ends of the cut pipe blank, then flaring the pipe blank by using a punch, and selecting the flaring size according to the actual required aperture; (as shown in FIG. 2)

Step four: turning the pipe of the pipe blank after the flaring is finished, removing redundant parts, and processing the outline of the pipe blank into a preset size which is in accordance with the size of an outline cavity of a bending die in the next step;

step five: after the turning of step four, the pipe profile keeps unanimous, puts into the mould of bending with it, controls the hydraulic press and bends, and the eccentric distance of bending can be adjusted at reasonable within range according to the curved foot needs of reality, the concrete operation step of the mould of bending: lifting the upper two mold cores, placing the tube blank, resetting the upper mold, extending the core rod into the mold, moving the two overlapped mold cores on one side for 7.5mm to eccentrically bend and mold the tube blank, and taking out the bent and molded bent pin; (as shown in FIG. 3)

Step six: after the bending and forming in the step five are finished, taking out the semi-finished product bent foot, putting the semi-finished product bent foot into a flattening die, and operating a hydraulic press to shape and flatten the middle section of the semi-finished product bent foot, wherein the method comprises the following specific steps: lifting an upper die, putting a semi-finished curved pin into the upper die, resetting the upper die, stretching a core rod into a die, moving a pressing block right opposite to the semi-finished curved pin under the driving of a hydraulic press, pressing the curved pin, and taking out a pressed curved pin; (as shown in FIG. 4)

Step seven: taking the bent pin out of the flattening die, clamping by using a lathe, rolling external threads at two ends of the bent pin, and performing surface burr treatment to obtain the finished stainless steel bent pin. (as shown in FIG. 5)

Preferably, the shape of the mandrel is the same as the inner hole structure of the forming tube blank related to the step. (as shown in FIG. 6)

Compared with the traditional stamping die, the bending and flattening die is provided with the loose core for shaping, the core rod of the bending and flattening die is inserted into the die core from the side surface of the die and extends into the inner hole of the tube blank, and the corresponding tooling core rod is designed based on the step process and the shaping state, so that the problem of inconsistency of the final finished product caused by mechanical equipment or other factors due to the batch bending or flattening shaping process is solved.

The invention is not limited to the above description, and any modifications, equivalent substitutions, improvements and the like within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. An extrusion forming process of a stainless steel water warming foot is characterized in that: the method comprises the following steps:

the method comprises the following steps: preparing a stainless steel pipe;

step two: the stainless steel pipe is cut into pipe blanks with the same length by laser, and the length difference is kept between 1 mm;

step three: polishing the cut to remove burrs, then flaring the pipe blank by using a punch, and selecting the flaring size according to the actual required aperture;

2. The extrusion molding process of the stainless steel hot bending foot according to claim 1, characterized in that: turning the tube blank in the fourth step is mainly to keep the tube blank with small-amplitude deformation consistent after cutting and flaring, and is convenient for the fifth step.

3. The extrusion molding process of the stainless steel hot bending foot according to claim 1, characterized in that: and the bending die in the fifth step is used for fastening the tube blank before bending, and is also provided with a core rod inserted into the inner hole of the tube blank for shaping.

4. The extrusion molding process of the stainless steel hot bending foot according to claim 1, characterized in that: and the flattening die in the sixth step is provided with a core rod with the same shape as the inner hole of the finished curved pin, and the core rod is driven by the hydraulic press to extend into the inner hole of the curved pin to be processed before being pressed so as to position the flattened shape of the curved pin.

5. The extrusion molding process of the stainless steel hot bending foot according to the claim 3 or 4, characterized in that: the shape of the core rod is the same as the inner hole structure of the forming tube blank related to the step.