CN1053405C

CN1053405C - Cold drawing technique for forming reducing stainless steel elbow and teapot mouth made thereby

Info

Publication number: CN1053405C
Application number: CN 95118467
Authority: CN
Inventors: 邵万泰
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-27
Filing date: 1995-10-27
Publication date: 2000-06-14
Anticipated expiration: 2015-10-27
Also published as: CN1130551A

Abstract

The present invention relates to a diameter changing and pipe bending technology for stainless steel plate by cold drawing and a tea pot nozzle made by the technology. The the prior art generally uses a technology for oppositely welding two concave arcs, which has low efficiency and high material consumption. After a plurality of deep-drawing technologies are used, a work piece continues to be bent and deeply drawn into a tapered bent pipe. After port cutting, a semicircular die is used for downwards rolling, which bends the work piece into required curvature along a circular arc groove. The pipe wall of a made tea pot nozzle has no seams, work efficiency and material utilization can be obviously enhanced, and production cost can be reduced.

Description

The cold drawn forming technology of stainless steel reducing bend pipe

The invention belongs to metal pull and stretch technical field, particularly become the forming technology of reducing bend pipe and the product of making of this technology with the stainless sheet steel pull and stretch.

Because stainless steel material intensity height, toughness is big, and the surface is sticking puckery, has only the mature technology of isometrical straight tube or bend pipe in the prior art, makes the forming technology of reducing curved tube of stainless sheet steel and does not capture as yet.The Hu Zui of stainless steel tea kettle for example, present preparation method be with about the cambered surface butt joint of the curved recessed garden of half and half stamping forming two slit bamboo or chopped woods through welding fabrication, again with two weld seam polishings.The product of the similar spout of a teapot of no weld seam drawing and forming although many enterprises are arranged in development, is not seen successfully always.Chinese patent application numbers 89101119.6, " method of making stainless steel kettle by integral drawing " disclosed technical scheme by name also only relate to the drawing and forming method of stainless steel kettle kettle body, and Hu Zui adopts still out-of-date methods to make.Russian Patent SU-651-870 has introduced the curved setup for drawing parts of a kind of conical metal pipe list, but does not solve two curved and product forming process, does not also relate to this certain material of stainless steel.The technology of existing reducing bend pipe has following shortcoming: leftover pieces are many, and stock utilization is low, and operation is many, and production efficiency is low, and power consumption is high, and these have caused the high product integrated cost.

Purpose of the present invention provides the new process of making stainless steel reducing bend pipe that a kind of production efficiency height, power consumption are low, save material and ensure the quality of products, and makes seamless stainless steel reducing bend pipe goods with this method, such as cast steel spout of a teapot not.

The technical scheme of technology of the present invention is: at first adopts existing deep-drawing technique, comprises the punching blanking, and the tubular pull and stretch, multiple tracks ladder pull and stretch, the ladder taper drawing is made the pipe that an end has a ladder, carries out the conical camber pull and stretch then, comprising:

1, pipe annealing in process;

2, make rotating mechanism be parked in negation spacing on, it is spacing that up and down device is parked in D score, promptly die leans against on the base plate, solid punch is installed in the relevant position of rotating mechanism center platen;

3, the pipe that will put into behind the movable punch is put into die;

4, the starting rotating mechanism is to the rotation of " just " direction, and the driving pressing plate presses down solid punch with movable punch and pushes up mutually, eliminates the ladder of pipe, finishes the pull and stretch of crooked position, and it is spacing that at this moment pressing plate is parked in " just ";

5, start up and down device, its push rod will be pushed up on the die, when arrive " on " reset downwards immediately when spacing, finish drawing of large port vertical position;

6, the surplus behind the cutting pull and stretch and the bottom of pipe;

Main points of the present invention are: the crooked siphunculus workpiece of making through above-mentioned operation is carried out bending forming, comprising:

1, annealing in process;

2, put between the groove of garden shape mould and half garden shape mould, and be enclosed within on the plug;

3, the starting rotating mechanism makes the connecting rod bottom, half garden shape mould rolls downwards thereupon, drives the plug fixed mount simultaneously and links downwards, makes this siphunculus workpiece be subjected to the roll extrusion of half garden shape mould groove under the bracketing of plug, groove along garden shape mould is bent downwardly, and plug withdraws from workpiece gradually in descending process.

Movable punch in the above-mentioned pipe can be made up of moving punch of the long-term job of putting into successively and short movable punch apical grafting.

Above-mentioned rotating mechanism is can forward and reversely to be rotated by the motor-driven pressing plate, and positive and negative stopping means is arranged.

Above-mentioned up and down device is to pass base plate by many (such as the 2-4 root) push rod activities, and the push rod upper end is fixedly connected with die, and the lower end of push rod is driven up and down by power, and die is also moved up and down with push rod.

The workpiece that makes as stated above after sharp-tongued finishing and whole polishing, promptly becomes the weldless stainless steel S of tube wall shape spout of a teapot.

The reducing stainless steel elbow that utilizes cold-drawing process method provided by the present invention to make has the following advantages:

1, tube wall is seamless bright and clean, good looking appearance;

2, omit the welding sequence in the traditional handicraft, can improve product qualified rate, and saved processing charges 5-8%;

3, the shape according to pipe fitting varies in size, and can improve stainless steel material utilization rate 3-10%.

In the accompanying drawing, Fig. 1 is the two slit bamboo or chopped wood formulas processing drawing of existing stainless steel tea kettle mouth, Fig. 2 is a tubular pull and stretch schematic diagram, Fig. 3 has represented a, b, c three road ladder pull and stretch schematic diagrames, Fig. 4 has represented the pipe shape through the ladder taper drawing, and Fig. 5 (a) is a pipe crooked position pull and stretch schematic diagram, and Fig. 5 (b) is that pipe large port vertical position draws schematic diagram, Fig. 8 is a conical pipe BENDING PROCESS schematic diagram, and Fig. 9 is the spout of a teapot schematic diagram after retapering mouth and polishing.

Below in conjunction with embodiment and accompanying drawing, technical scheme of the present invention is described further.

The Thin Stainless Steel plate thickness that present embodiment adopted is 0.7mm.

The drawing process of Fig. 1～Fig. 4 is at " stamping technology ", " all can consult in the book such as Stamping Die Design handbook, no longer carefully state.

Referring to Fig. 5 and Fig. 6,, then the moving punch 2 of long-term job, short movable punch 3 are put into pipe 5 successively at first with cold drawn pipe 5 annealing in process; Pressing plate 1 can come back rotation near 180 ° of scopes; Die 6 can pump with four push rods 8 of up and down mechanism.Solid punch 4 is installed in the relevant position of pressing plate 1, and it is spacing to be parked in negation with rotating mechanism, and die 6 is parked in D score spacing (at this moment die 6 leans against on the base plate 7) with the push rod 8 of up and down mechanism; The pipe 5 of putting into long and short movable punch 2,3 is put into die 6; The starting rotating mechanism rotates to " just " direction, solid punch 4 on the pressing plate 1 presses down thereupon and pushes up mutually successively with movable punch 3,2, pipe 5 is stressed by pull and stretch, dotted line has represented that pressing plate 1 goes to the residing position of solid punch when vertical among the figure, it is spacing only to be parked in " just " to pressing plate 1, crooked position is subjected to pull and stretch, and original ladder is drawn as smooth surface (shown in Fig. 5 (a)).Start up and down mechanism, push rod 8 is moved upward die 6, arrive " on " when spacing (as shown in phantom in FIG.), reset downwards immediately that it is spacing to get back to D score, finish the drawing of large port vertical position of pipe 5, shown in Fig. 5 (b).Starting rotating mechanism at last, to make pressing plate 1 get back to negation spacing, makes solid punch 4 break away from pipes 5, takes out pipe 5 and pour out short, the moving punch 3,2 of long-term job, finished whole conical camber drawing sequence.

Above-mentioned pipe 5 two ends cutting through the conical camber pull and stretch is formed tubulose, promptly become as shown in Figure 7 conical camber siphunculus workpiece 5 '.

Referring to Fig. 8, garden shape mould 9 is installed on the fixed head 10, and half garden shape mould 11 is installed on the lever arm that the lower end is enclosed within the connecting rod 12 on the shape mold shaft of garden.For with workpiece 5 ' taper fit, eccentric groove is all made at the wheel rim place of garden shape mould 9 and half garden shape mould 11.Plug fixed mount 14 is installed on the lever arm of connecting rod 12, can swings up and down with connecting rod 12.Be installed in locating piece 13 on the fixed head 16 can limit workpiece 5 ' crooked position.During operation, at first with workpiece 5 ' extend in the groove of garden shape mould and half garden shape mould, and entangle plug 15, till offseting with locating piece 13; Plug 15 is by alignment pin 17 and nut 18 plug 15 and fixed mount 14 to be fixed as one.Start connecting rod 12 then to lower swing, drive half garden shape mould and roll downwards, under the bracketing of the groove roll extrusion of half garden shape mould and plug, workpiece 5 ' bend downwards along the groove of garden shape mould 9, plug 15 outwards withdraws from gradually, has promptly finished the bending operation of conical pipe workpiece.

The osculum end of the above-mentioned reducing bend pipe that has been shaped is accomplished sharp mouth, promptly become the Hu Zui of seamless stainless steel teapot, as shown in Figure 9.

Use above-mentioned technology, also can make door, the high-grade handle of cabinet, many products such as pipe joint of specific (special) requirements,, also can be made into various non-gardens stainless steel curved tapers pipe if each concave, convex is molded as many prismatics or ellipse garden shape.

Claims

1, the cold drawn forming technology of stainless steel reducing bend pipe, through punching blanking---tubular pull and stretch---multiple tracks ladder pull and stretch---operations such as ladder taper drawing, making an end has the pipe of a ladder (5), carries out the conical camber pull and stretch then, comprising: with pipe (5) annealing in process; It is spacing to make rotating mechanism be parked in negation, and it is spacing that up and down device is parked in D score; Solid punch (4) is installed in the relevant position of rotating mechanism center platen (1); The pipe (5) of putting into movable punch is put into die (6); The starting rotating mechanism is to the rotation of " just " direction, and driving pressing plate (1) presses down solid punch (4) is pushed up mutually with movable punch, finishes the pull and stretch at conical camber position; Start up and down device, make its push rod (8) will die (6) go up the top, when arrive " on " reset downwards immediately when spacing, finish drawing of large port vertical position; The surplus behind the cutting pull and stretch and the tube end,

It is characterized in that: the conical camber siphunculus of making through above-mentioned operation (5`) is carried out bending forming again, comprising:

A, annealing in process;

B, siphunculus (5 ') is put between the groove of circular mode (9) and semicircle mould (11), and entangled plug (15);

C, starting rotating mechanism make connecting rod (12) bottom, semicircle mould (11) rolls downwards thereupon, drive fixed mount (14) interlock downwards simultaneously, make siphunculus (5 ') under the bracketing of plug (15), be subjected to the roll extrusion of semicircle mould (11), groove along circular mode (9) is bent downwardly, and plug (15) outwards withdraws from synchronously gradually.

2, cold drawn forming technology as claimed in claim 1 is characterized in that the movable punch in the pipe (5) can be made up of moving punch (2) of the long-term job of putting into successively and short movable punch (3) apical grafting.

3, cold drawn forming technology as claimed in claim 1 is characterized in that described rotating mechanism should have pressing plate (1), and has positive and negative rotary limit device, can install and fix punch (4) on the pressing plate (1).

4, cold drawn forming technology as claimed in claim 1 is characterized in that up and down device passes base plate (7) with many push rods (8) activity in advance, and is fixedly connected with die (6).