CN1076642C - Method for producing expanding pipe joint - Google Patents

Abstract

The present invention relates to a method capable of carrying out production with high shape precision under the condition of a small expansion tube joint, which is realized by the following steps: step 1, a cylindrical extrusion cylinder 2 with a bottom is formed by extruding; step 2, the extrusion cylinder 2 is processed through pressure by a punch press to form an expansion cylinder 2'; step 3, the bottom of the expansion cylinder 2' is punched. The step 2 is carried out by the following metal moulds: a lower mould 3, an upper mould 4, a first plunger tip 5, a second plunger tip 6, a stripper pin 7, a first oil discharge path 32 arranged on the lower mould 3, a second oil discharge path 60 arranged on the plunger tip 6 and a third oil discharge path arranged on the stripper pin 7. Oil can smoothly flow out at the time of pressure processing, and thus, production can be carried out with stable shape precision.

Description

The manufacture method of expanding pipe joint

The present invention relates to a kind of manufacture method of inserting flexible pipe inside with the expanding pipe joint that bears engaging force when connecting the flexible pipe Trunk Connector, in more detail, relate to a kind of manufacture method that can produce expanding pipe joint in continuously shaped mode continuously.

Under situation about for example Trunk Connector being bonded on the flexible pipe, improve bond strength in order to bear engaging force, in flexible pipe, insert pipe joint.This pipe joint positions in order to prevent from really to come off, and must have the external diameter greater than inner diameter, and if do the pipe joint entire outer diameter also bigger than the internal diameter of flexible pipe, the insertion of pipe joint load will become greatly, and it is very big also can to become man-hour.

Thereby, adopted the external diameter expanding pipe joint slightly littler of the general place of the bulge that has the middle body external diameter and increase, pipe joint portion both sides in recent years than inner diameter.For this expanding pipe joint, also the internal diameter than flexible pipe is little for the external diameter of general place because the length of bulge ratio is in the past little, thereby it is little to insert load, can insert the precalculated position in the flexible pipe at an easy rate, and has prevented to come off.

The goods of this expanding pipe joint shape generally are produced by cutting from tubing.

Yet, the shape of expanding pipe joint, diameter at its bulge is little under about 3.65mm, the little degree that arrives about 17mm of length, make this expanding pipe joint with manufacture methods such as cuttings, have the problem that very big and utilization rate of raw materials in man-hour, processability worsen, aspect cost, also have problems.

The present invention In view of the foregoing, even the method that purpose is to provide a kind of very little expanding pipe joint also can produce with high form accuracy.

The feature of manufacture method that realizes the expanding pipe joint of the present invention of above-mentioned purpose is by cylindrical circular general portion roughly with in the manufacture method of the expanding pipe joint that bulge constituted that the central hole enlargement of general portion forms, and carries out following procedure of processing:

Step 1 is formed with bottom tube-like extruding cylindrical shell by metallic plate being carried out extrusion process; Step 2 forms bulge with recipient body and function stamping machine by pressure processing and makes the expansion cylindrical shell; Step 3 is with the bottom punching of expansion cylindrical shell;

Step 2 adopts following metal pattern die to carry out: mo(u)ld bottom half, mo(u)ld top half, push down the end face of extruding cylindrical shell the 1st drift, insert the extruding inner barrel bar-shaped the 2nd drift, will push the stripper pin of the bottom of cylindrical shell exerting pressure, be opened on the 1st the moving back oily path, be opened on the 2nd on the 2nd drift front end face and move back oily path, be opened on the 3rd on the stripper pin front end face and move back oily path of position, boundary of the profile of the profile that forms the mo(u)ld bottom half bulge and the general portion of formation from foreign side along axis direction.

In manufacture method of the present invention, at first in step 1, form the extruding cylindrical shell by extrusion process.This step 1 is same with common extrusion process, generally forms long extruding cylindrical shell by extrusion process repeatedly is final.

In step 2, on the extruding cylindrical shell, form dilation by pressure processing.

Here, in pressure processing, used processing oil, but at the extruding cylindrical shell for bottom tube-like is arranged, its diameter is under several millimeters the situation, owing to the opposing of the oil that is accumulated between inside or metal pattern die and the goods, the situation of machining shape precision step-down obviously can occur.

Thereby in manufacture method of the present invention, adopted to have the 1st of the position, boundary that is opened on profile that forms the mo(u)ld bottom half bulge and the profile that forms general portion and move back oily path, be opened on the 2nd on the 2nd drift front end face and move back oily path, be opened on the 3rd on the stripper pin front end face and move back the step 2 that the metal pattern die of oily path carries out.

Move back oily path by being provided with the 1st, can allow the oil between profile and the goods withdraw from, thereby improved the form accuracy at bulge and general position, portion boundary, the generation on the limit that prevented to collapse.In addition, move back oily path, can allow the oil of extruding cylindrical shell bottom withdraw from, thereby prevent that bulge from deforming by being provided with the 2nd.Move back oily path by being provided with the 3rd, then can improve the precision on the length direction, prevent that bulge from deforming.

Like this, the high expansion cylindrical shell of the form accuracy that obtains by step 2 in step 3 by the bottom demoulding, thereby obtain expanding pipe joint.

Fig. 1 is the stereogram of expanding pipe joint made in the one embodiment of the invention;

Fig. 2 is the mode declaration pattern specification figure of the step 1 of expression one embodiment of the invention;

Fig. 3 is the cutaway view of the pressure processing pattern of expression one embodiment of the invention before carrying out the 2nd step;

Fig. 4 is the cutaway view of the pressure processing pattern of the state of expression one embodiment of the invention after step 2.

Among the figure, the 1st, expanding pipe joint, the 2nd, extruding cylindrical shell, the 3rd, mo(u)ld bottom half, the 4th, mo(u)ld top half, 5 is the 1st drifts, and 6 is the 2nd drifts, the 7th, and stripper pin, the 10th, bulge, the 11st, general portion, the 12nd, the circular cone face, 32 is the 1st to move back oily path, and 60 is the 2nd to move back oily path, and 70 is the 3rd to move back oily path.

Specify below by embodiment.

Fig. 1 is the amplification stereogram of the expanding pipe joint made in the one embodiment of the invention.Expanding pipe joint 1 is that the bulge 10 of 3.65mm and the external diameter that extends in bulge 10 both sides are that the general portion 11 of 3.2mm constitutes by external diameter, and bulge 10 forms circular cone face 12 with the position, boundary of general portion 11.

(step 1)

Adopting thickness is the metallic plate 20 of 0.5mm, forms the extruding cylindrical shell 2 of predetermined length as shown in Figure 2 through extrusion process repeatedly.

(step 2)

Then, form bulge 10 with Fig. 3 and pressure processing pattern shown in Figure 4 in the central authorities of extruding cylindrical shell 2.

Described pressure processing pattern is made of mo(u)ld bottom half 3, mo(u)ld top half 4, the 1st drift 5 of pushing down extruding cylindrical shell 2 end faces, cylindric the 2nd drift 6 and the stripper pin 7 that inserts in the extruding cylindrical shell 2.

Like this, be radial the 1st of 4 positions, boundary that are opened on expansion profile 30 and circular cone profile 31 that are formed with on the mo(u)ld bottom half 3 and move back oily path 32 (only showing 1 among the figure).In addition, on the 2nd drift 6, be formed with and be opened on the 2nd on its front end face and move back oily path 60.And be formed with on the stripper pin 7 and be opened on the 3rd of its front end and move back oily path 70.

At first, will push cylindrical shell 2 and be configured on the mo(u)ld bottom half 3, with mo(u)ld top half 4 and stripper pin 7 fit ons.Like this, by allowing the 1st drift 5 and the 2nd drift 6 exert pressure to extruding cylindrical shell 2, make 2 hole enlargements of extruding cylindrical shell, formation has as shown in Figure 4 along the bulge 10 of the shape of expansion profile 30 and circular cone profile 31 and the expansion cylindrical shell 2 ' of conus portion 12.

At this moment, retaining in oil between extruding cylindrical shell 2 and the mo(u)ld bottom half 3 moves back oily path 32 from the 1st and flows to the outside.Thereby the so-called bad limit of collapsing that has prevented that oil plant is remaining and reduced facial 12 form accuracies of circular cone.In addition, remain in oil in the extruding cylindrical shell 6 and move back oily path 60 from the 2nd and flow to the outside, thereby prevented because oil plant remaining makes to push between cylindrical shell 2 excessive compression, mo(u)ld top half 4 and the mo(u)ld bottom half 3 and deform.And, retain in stripper pin 7 and move back oily path 70 from the 3rd and flow to the outside owing to allow, thereby guaranteed the length precision with pushing oil between the cylindrical shell 2, also prevented distortion.

In addition, the length precision of extruding cylindrical shell 2 also is very important.Extruding cylindrical shell 2 total lengths surpass 17.75mm and will produce visible distortion, are in and will see the bad limit of collapsing below the 17.45mm.Thereby in order to obtain above-mentioned effect of moving back oily path, must be controlled at the total length of extruding cylindrical shell 2 in this scope, be to obtain above-mentioned effect of moving back oily path under the situation outside this scope.

(step 3)

Moulding cylindrical shell 2 ' pattern to open the back release by the rising of stripper pin 7.Like this, its bottom is configured on the punch metal pattern not shown in the figures and carries out punching, rounding has just been made expanding pipe joint shown in Figure 1 by the cleaning processing of both ends of the surface again.

According to the manufacture method of expanding pipe joint of the present invention, can produce the bad high expanding pipe joints of form accuracy such as the limit that can not occur being out of shape, collapsing by using the continuously shaped output of extrusion process with continous-stable.Thereby improved productive rank, reduced production cost.

Claims (1)

1, a kind of manufacture method of expanding pipe joint is characterized in that carrying out following procedure of processing by cylindrical circular general portion roughly with in the manufacture method of the expanding pipe joint that bulge constituted that the central hole enlargement of general portion forms:

Step 1 is formed with bottom tube-like extruding cylindrical shell by metallic plate being carried out extrusion process;

Step 2 forms bulge with recipient body and function stamping machine by pressure processing and makes the expansion cylindrical shell;

Step 3 is with the bottom punching of expansion cylindrical shell;

Step 2 adopts following metal pattern die to carry out: mo(u)ld bottom half, mo(u)ld top half, push down the end face of extruding cylindrical shell the 1st drift, insert the extruding inner barrel bar-shaped the 2nd drift, will push the stripper pin of the bottom of cylindrical shell exerting pressure, be opened on the 1st the moving back oily path, be opened on the 2nd on the 2nd drift front end face and move back oily path, be opened on the 3rd on the stripper pin front end face and move back oily path of position, boundary of the profile of the profile that forms the mo(u)ld bottom half bulge and the general portion of formation from foreign side along axis direction.

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