CN1336262A

CN1336262A - Tubular part forging method

Info

Publication number: CN1336262A
Application number: CN 00120829
Authority: CN
Inventors: 林木生
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-08-02
Filing date: 2000-08-02
Publication date: 2002-02-20
Anticipated expiration: 2020-08-02
Also published as: CN1117643C

Abstract

The invented forging method of pipe fitting can make the forged pipe fitting possessing high shock absorption effect and high pressure resistance. It includes forge hole, insert wax bar, pressure forming and heat melting processes. The rigid bar is drawn into seamless hollow round tube. By mould press process, pipe fitting is formed with concave reinforced rib on its cross section, finally heating makes the wax melted to flow out and obtains the product.

Description

The forging method of pipe fitting

The present invention relates to FMT, relate in particular to a kind of forging method of pipe fitting.

Pipe fitting can apply to various connections or support part, as all kinds of support bodys, bicycle branch pipe and crank ... Deng pipe fitting, these pipe fittings probably can be divided into two kinds of shapes, and a kind of is solid tubes, and another kind is a hollow circular-tube.Solid tubes 10 as shown in Figure 1, it is to be formed by the metal material integrally casting, though the compressive property of solid tubes 10 is fine, but its Heavy Weight and material cost height, the ingredient of its material is to be closely linked simultaneously, do not have too big space for shock-absorbing, so a shock-absorbing performance extreme difference of solid tubes 10, and be not suitable for the product that needs strong shock-absorbing performance as bicycle etc.

Hollow pipe also has two kinds of different shapes, and shown in Fig. 2 A is a kind of hollow circular-tube 20 by the panel beating roll forming, and this class hollow circular-tube 20 can be formed with a seam 25, though this class hollow circular-tube 20 has alleviated weight, also improves the part shock-absorbing performance.Yet owing to seam 25 promptly can be split after being subjected to certain pressure, so its compressive property is still very poor, so be not easy to be used.Use at present is the hollow circular-tube 30 shown in Fig. 2 B comparatively widely, this hollow circular-tube 30 is to utilize the mode of forging to take out the hole to form, therefore it is no seam shape, the compressive property of hollow circular-tube 30 is improved, and maintain certain shock-absorbing performance, but the compression strength of this class hollow circular-tube 30 still can't reach requirement.Therefore the end of bicycle branch pipe is crushed when sealed, and hollow circular-tube 30 often forms the stress concentration points fracture damage because of this position.

Via above-mentioned explanation as can be known, no matter existing pipe fitting is solid tubes or hollow circular-tube, because manufacturing technology is restricted, cause it can't take into account the effect of high resistance to compression and shock-absorbing performance simultaneously, make the use of pipe fitting be subjected to certain restriction, and the outward appearance of existing pipe fitting does not have plasticity, therefore can't improve its aesthetic property.So studying light, high crushing resistance of a kind of material and the good pipe fitting of shock absorption is to improve the practical value of pipe fitting and the key of economic benefit.

The problem further investigation that the inventor exists at existing tube manufacturing method, and according to general people to the pipe fitting demand, actively seek the scheme that solves, through the research of long-term endeavour with study, finally Cheng Gong the forging method of developing a kind of pipe fitting, make the pipe fitting made in this way can be simultaneously with the usefulness of high crushing resistance and good shock absorption.

Main purpose of the present invention is to provide a kind of forging method of pipe fitting, it is taken out the hole, inserts steps such as wax bar, compression molding and thermalization by forging, make solid bar take out hole formation hollow pipe fitting via forging after, insert the wax bar in pipe fitting inside, then pipe fitting is inserted upper and lower intermode with moulded section, make the pipe fitting periphery form required reinforced ribs, and after thermalization, the wax bar fusion of pipe fitting inside is taken out, thereby improve the shock-absorbing performance of pipe fitting, can strengthen the compressive property of pipe fitting simultaneously.

The objective of the invention is to realize by following technical scheme.

The forging method of pipe fitting of the present invention, it comprise forge take out the hole, insert the wax bar, compression molding and thermalization operation, described forging is taken out the hole operation solid bar pull is become jointless hollow pipe fitting; Inserting wax bar operation is the inside of the wax bar corresponding with the hollow pipe fitting internal diameter being filled in hollow pipe fitting; The compression molding operation is that the hollow pipe fitting that is equipped with the wax bar is inserted between patrix and the counterdie, and the die cavity of this patrix and counterdie is respectively equipped with the moulding of corresponding concaveconvex shape, after patrix and counterdie pressing, can form reinforced ribs at the pipe fitting periphery; The thermalization operation is to heat through the pipe fitting after the compression molding operation, and the wax bar fusion back of pipe fitting inside is flowed out, and becomes the pipe fitting finished product that periphery has reinforced ribs.The die cavity of described patrix and counterdie can be designed to various different shapings according to user's needs, so that the pipe fitting periphery forms different shaping, increases the aesthetic feeling of its outward appearance.

For further understanding technology contents of the present invention, characteristics and effect, exemplify following preferred embodiment now, and conjunction with figs. is described in detail as follows:

Fig. 1 is the three-dimensional appearance schematic diagram of existing solid tubes.

Fig. 2 A is the three-dimensional appearance schematic diagram of existing jointed hollow circular-tube.

Fig. 2 B is the three-dimensional appearance schematic diagram of existing jointless hollow circular-tube.

Fig. 3 is a manufacturing process flow schematic diagram of the present invention, makes the method and the step of pipe fitting in order to explanation.

Fig. 4 is the schematic diagram of pipe fitting compression molding of the present invention, in order to explanation hollow circular-tube mold process and completed state.

Fig. 5 A is the schematic diagram of a kind of moulding behind the formation of tubes of the present invention, and section and apparent condition behind the formation of tubes are described.

Fig. 5 B is the schematic diagram of another kind of moulding behind the formation of tubes of the present invention, and section and apparent condition behind the formation of tubes are described.

The present invention is a kind of forging method that makes pipe fitting with the pipe fitting of high compressive property and preferable shock-absorbing performance, see also shown in Fig. 3,4, the forging method of this pipe fitting mainly includes forging and takes out hole A, inserts operations such as wax bar B, compression molding C and thermalization D, make pipe fitting 50 finished products have reinforced

ribs

51,52, to improve its compressive property and shock-absorbing performance.Be described in detail as follows at above-mentioned each operation:

Hole A is taken out in forging: with the mode that solid bar is taken out hole A with the forging of existing forging machine, pull becomes the hollow pipe fitting 50 of no seam shape, for inserting the operation of wax bar B; Insert wax bar B: wax bar 55 that will be corresponding with pipe fitting 50 internal diameters, the complete inside of filling in hollow pipe fitting 50 when carrying out compression molding C, forms a kind of support to pipe fitting 50, avoids any distortion of pipe fitting 50; Compression molding C: the pipe fitting 50 that inside is equipped with wax bar 55 is inserted has corresponding die cavity 61, on 66, counterdie 60, between 65, wherein die

cavity

61,66 form the reinforced ribs 51 of corresponding pipe fitting 50,52 concaveconvex shape, when last, counterdie 60, during 65 pressings, just can make pipe fitting 50 peripheries form reinforced

ribs

51,52, thereby improve the compression strength of pipe fitting 50, because pipe fitting 50 inside are equipped with wax bar 55, make pipe fitting 50 inside last, counterdie 60, during 65 pressings, producing a kind of reaction force can avoid pipe fitting 50 when pressing, pipe fitting 50 is out of shape arbitrarily or breaks, and because wax bar 55 has smooth characteristic, therefore the inwall of pipe fitting 50 can form smooth shape, avoid because of coarse surface forms stress concentration point, to increase the compression strength of pipe fitting 50; Thermalization D: after pipe fitting 50 is through compression molding C, pipe fitting 50 is heated, make the wax bar 55 of pipe fitting 50 inside fuse into wax oil, flow out pipe fitting 50 inside simultaneously fully because of the high temperature thermalization with heater; Finished product E: treat that pipe fitting 50 because of after heating flows out 55 thermalizations of wax bar, can form pipe fitting 50 finished products that periphery has reinforced

ribs

51,52 or other moulding.

After solid bar is taken out hole A operation formation hollow pipe fitting 50 via above-mentioned forging, insert wax bar B in pipe fitting 50 inside, then pipe fitting 50 is inserted 60,65 of upper and lower moulds with compression molding C, make pipe fitting 50 peripheries form required reinforced

ribs

51,52, and behind thermalization D, the wax bar fusion of pipe fitting 50 inside is taken out, form pipe fitting 50 finished product E by above-mentioned forging method, shown in Fig. 5 A, Fig. 5 B.

At least have following function and effectiveness by the formed pipe fitting 50 of above-mentioned forging method, such as:

1. light weight: the pipe fitting 50 that the present invention makes is hollow shapes, and has reinforced

ribs

51,52, therefore under identical compression strength, no matter be to come relatively with existing solid tubes (material is many) or hollow tube (needing to strengthen external diameter), the weight of pipe fitting 50 is light than both all.

2. shock-absorbing performance is good: because pipe fitting 50 is to be hollow tubular, and cooperates the design of recess reinforced

ribs

51,52, make pipe fitting 50 produce the phenomenon of a kind of summary like elastic reaction, can effectively increase the shock-absorbing effect of pipe fitting 50.

3. anti-seismic performance height: brought forward is described, and the effect of reinforced

ribs

51,52 is except can providing preferable shock-absorbing effect, and pipe fitting 50 Points And lines that bears weight can obtain effectively to share simultaneously, so the compression strength of pipe fitting 50 is preferable.

4. attractive in appearance: by design of the present invention, the producer can comply with various demand, in the various moulding of pipe fitting 50 surface design, increases the practical value and the aesthetic property of pipe fitting 50.

5. long service life: because pipe fitting 50 is when compression molding, its inside is equipped with wax bar 55, and wax bar 55 itself has smooth characteristic, make pipe fitting 50 inner surfaces form smooth shape, so can avoid occurring stress concentration point, prevent that pipe fitting 50 from splitting because of weight, reach the purpose that prolongs its service life.

6. cost is low: whole Forging Technology equipment required or that increase is few, so cost of equipment can't be too high, so but can produce the high efficiency product, after comparing, can reduce its manufacturing cost really.

7. be easy to moulding: pipe fitting 50 only needs via mold pressing reinforced

ribs

51,52, and heating taking-up wax bar 55 is promptly plastic, so the manufacturing moulding is easy.

The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.

Conclude above-mentioned explanation, the present invention can effectively solve the problem that existing solid tubes or hollow circular tube can't have compressive property and shock-absorbing performance simultaneously concurrently, have above-mentioned numerous usefulness and practical value simultaneously, therefore the present invention one highly utilizes the creation of law of nature, and in identical technical field, do not see identical or approximate product public use, meet the important document of patent of invention, so file an application in accordance with the law.

Claims

1, a kind of forging method of pipe fitting is characterized in that, it comprise forge take out the hole, insert the wax bar, compression molding and thermalization operation, it is that the solid bar pull is become jointless hollow pipe fitting that the hole operation is taken out in described forging; Inserting wax bar operation is the inside of the wax bar corresponding with the hollow pipe fitting internal diameter being filled in hollow pipe fitting; The compression molding operation is that the hollow pipe fitting that is equipped with the wax bar is inserted between patrix and the counterdie, and the die cavity of this patrix and counterdie is respectively equipped with the moulding of corresponding concaveconvex shape, after patrix and counterdie pressing, can form reinforced ribs at the pipe fitting periphery; The thermalization operation is to heat through the pipe fitting after the compression molding operation, and the wax bar fusion back of pipe fitting inside is flowed out, and becomes the pipe fitting finished product that periphery has reinforced ribs.