TWI638689B - Die structure of extrusion metal tube - Google Patents

Abstract

A mold structure for extruding a metal tube, comprising a split mold and a forming mold, the split mold having a plurality of split runners, each of the split props having a feed opening, a transverse axis having an edge with the inlet opening At a distance, the forming die has an annular shaped convex portion having a distance from a ring wall of the annular shaped convex portion, the transverse axis being spaced from the annular wall by a distance greater than the transverse axis to the edge Distance to extrude a metal tube having an outer diameter greater than the outer diameter of a metal ingot.

Description

Mold structure for extruding metal tube

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a mold structure for extruding a metal tube, and more particularly to a mold structure for extruding a small outer diameter metal ingot to form a metal tube having a large outer diameter.

In a conventional metal tube extrusion process, a metal ingot is extruded into a metal tube by an extrusion die, and the outer diameter of the metal ingot used must be larger than the outer diameter of the metal tube, otherwise When the metal ingot is extruded into the extrusion mold, it cannot be extruded to form a complete metal tube, or the tube wall of the metal tube may be broken or cracked.

The die structure of the extruded metal pipe of the present invention is used for extruding a metal pipe having an outer diameter larger than the outer diameter of a metal ingot, and the pipe wall of the metal pipe is prevented from being broken or cracked.

The main object of the present invention is to provide a mold structure for extruding a metal tube, comprising a split mold and a forming mold, the split mold comprising a chamber, a ring wall, a plurality of trusses, a column, a first surface and a second surface, the column includes a shunt column, a soldering column and a forming column, the soldering column is located between the shunt column and the forming column, and the shunt column and the trusses are disposed in the chamber The shunt column is a tapered column, and the trusses are respectively connected to the shunt column and the ring wall, so that the chamber is formed with a plurality of shunts, and the adjacent shunts are separated by a truss. Each of the diverting props has a receiving port, a discharging port, a first wall surface, a second wall surface, a third wall surface and a fourth wall surface, wherein the feeding port is located on the first surface, and the discharging port is located In the second surface, the first wall surface is an inner wall surface of the annular wall, the second wall surface faces the first wall surface, and the second wall surface is a surface of the shunt column, the third wall surface and the fourth wall The wall faces are respectively side wall faces of adjacent two trusses, and a horizontal axis passes through the a center of the column, the horizontal axis having a first distance from an edge of the inlet, the first distance being a maximum distance between the transverse axis and the edge, the transverse axis and the first wall Having a second distance, the transverse axis and the second wall have a third distance, and the second distance and the third distance are respectively gradually reduced by the second surface toward the first surface, and the forming die is combined In the split mold, the forming mold includes a third surface, a fourth surface, a first groove, a second groove and an annular shaped convex portion, the third surface facing the second of the split mold a surface of the first groove recessed in the third surface, the second groove is recessed in the fourth surface, the first groove communicates with the second groove, and the branch channel communicates with the first groove The first groove is located between the branching channel and the second groove, the welding column is located in the first groove, and the annular forming protrusion is disposed in the second groove, the ring forming a convex portion surrounding the forming column, and a forming flow path between the annular forming convex portion and the forming column The transverse axis of the annular shaped having a fourth distance between a projecting portion of the annular wall, the fourth distance is greater than the first distance.

The second distance between the transverse axis and the first wall surface of the shunt passage is gradually reduced by the second surface toward the first surface, and the transverse axis and the second wall of the shunt are The third distance therebetween is gradually reduced by the second surface toward the first surface, and the fourth distance between the transverse axis and the annular wall of the annular shaped convex portion is greater than the transverse axis and the feeding The first distance between the edges of the mouth is characterized by extruding a metal tube having an outer diameter greater than the outer diameter of the metal ingot and avoiding breaks or cracks in the tube wall of the metal tube.

Referring to FIG. 1 , an embodiment of the present invention is a mold structure 10 for extruding a metal tube for extruding a metal tube having an outer diameter larger than an outer diameter of a metal ingot 400 (not shown). The material of the metal ingot 400 may be selected from a metal material such as a magnesium alloy or an aluminum alloy. In this embodiment, the metal ingot 400 having an outer diameter of less than 170 mm is extruded to form a metal tube having an outer diameter of 170 mm. The outer diameter of the metal ingot 400 is less than 170 mm and the outer diameter of the metal tube is 170 mm, which is only one of the embodiments in which the present invention can be implemented.

Referring to FIG. 1 , the mold structure 10 includes a shunt mold 100 and a forming mold 200 . The forming mold 200 is coupled to the shunt mold 100. A shredder 300 is coupled to the shunt mold 100, and the shunt mold 100 is located. The ingot barrel 300 has an accommodating space 310, and the metal ingot 400 is disposed in the accommodating space 310, and an extrusion head 500 presses the metal ingot 400, and The metal ingot 400 is passed through the split mold 100 and the forming mold 200 to form a metal tube (not shown).

Referring to FIGS. 1 and 2 , the shunt mold 100 includes a chamber 110 , a ring wall 120 , a plurality of trusses 130 , a column 140 , a first surface 150 , and a second surface 160 . The column 140 includes a shunt column 141, a soldering post 142, and a forming post 143. The soldering post 142 is connected to the shunt column 141. The forming post 143 is connected to the soldering post 142. The soldering post 142 is connected. Between the shunting column 141 and the forming column 143, the shunting column 141 and the truss 130 are disposed in the chamber 110. The shunting column 141 is a tapered cylinder, and the trusses 130 are respectively connected to the shunt. The column 141 and the annular wall 120 are such that the chamber 110 is formed with a plurality of branching passages 170, and adjacent ones of the dividing passages 170 are spaced by a truss 130.

Referring to the figures 1, 2, 3, 4, 5 and 6, each of the runners 170 has a feed port 171, a discharge port 172, a first wall surface 173, a second wall surface 174, and a third wall surface. 175 and a fourth wall 176, the inlet port 171 is located at the first surface 150, the discharge port 172 is located at the second surface 160, and the first wall surface 173 is an inner wall surface of the ring wall 120. The second wall surface 174 is opposite to the first wall surface 173, and the second wall surface 174 is a surface of the shunt column 141. The third wall surface 175 and the fourth wall surface 176 are respectively side wall surfaces of the adjacent two trusses 130. Referring to FIGS. 1 and 3, the ingot 400 covers each of the inlets 171. When the extrusion head 500 presses the ingot 400, the ingot 400 enters each of the runners 170 via the inlet port 171. In the meantime, since the metal ingot 400 covers each of the inlets 171, when the ingot 400 is pressed, the diverter column 141 and the truss 130 are first contacted.

Referring to FIG. 6 , in the embodiment, the third wall surface 175 of one of the branch channels 170 and the fourth wall surface 176 of the other branch channel 170 have a thickness W between the trusses 130. The thickness W is gradually reduced from the first surface 150 toward the second surface 160. Preferably, the shunt column 141 and the truss 130 are adjacent to the end of the first surface 150 (ie, the inlet port 171). A chamfer R is formed respectively, and when the ingot 400 contacts the inlet port 171, each of the chamfers R can guide the ingot 400, and since the thickness W of the truss 130 is directed from the first surface 150 The second surface 160 is gradually tapered, so that the truss 130 can withstand the pressure of the extrusion head 500 to prevent the truss 130 from breaking.

Referring to Figures 2, 3, 4, 5, 6 and 7, a transverse axis L passes through the column 140, the transverse axis L passes through a center of the forming column 143, preferably, the diverting column 141, the welding The center of the column 142 and the forming column 143 is on the horizontal axis L, that is, the horizontal axis L passes through the center of the shunt column 141, the welding post 142 and the forming column 143. Please refer to Figures 2, 3 and 7. The horizontal axis L and the edge 171a of the inlet 171 have a first distance D1, the first distance D1 is a vertical distance from the edge 171a to the horizontal axis L, and the first distance D1 is the horizontal For the maximum distance between the axis L and the edge 171a, please refer to the figures 2, 3, 4 and 5, the horizontal axis L and the first wall surface 173 have a second distance D2, and the second distance D2 is the first a vertical distance from the wall surface 173 to the lateral axis L, the second distance D2 being gradually reduced by the second surface 160 toward the first surface 150 until the second distance D2 is substantially equal to the first distance D1, the horizontal axis There is a third distance D3 between the L and the second wall surface 174, and the third distance D3 is a vertical distance from the second wall surface 174 to the horizontal axis L, the third distance D3 is gradually reduced by the second surface 160 toward the first surface 150. Preferably, the second wall surface 174 of the branching channel 170 is substantially parallel to the first wall surface 173, when the metal ingot 400 material enters each of the When the runners 170 are separated, the metal ingot 400 material flows along the first wall surface 173, the second wall surface 174, the third wall surface 175, and the fourth wall surface 176 to the discharge port 172.

Referring to the figures 2, 3, 4 and 5, in the embodiment, the first wall surface 173 is an arc-shaped inclined surface, and the second distance D2 is a radius of the arc-shaped inclined surface, and the radius of the arc-shaped inclined surface is The second surface 160 tapers toward the first surface 150.

Please refer to the figures 2, 3, 4 and 5, in the embodiment, the shunt column 141 is a cone. The third distance D3 is the radius of the cone, and the radius of the cone is gradually reduced by the second surface 160 toward the first surface 150.

Referring to FIGS. 1 , 3 and 8 , the forming die 200 includes a third surface 210 , a fourth surface 220 , a first groove 230 , a second groove 240 , and an annular shaped protrusion 250 . The third surface 210 faces the second surface 160 of the shunt mold 100. The first recess 230 is recessed on the third surface 210. The second recess 240 is recessed on the fourth surface 220. The first recess The groove 230 communicates with the second groove 240. The branch channel 170 communicates with the first groove 230. The first groove 230 is located between the branch channel 170 and the second groove 240.

Referring to FIGS. 3 and 8 , the soldering post 142 is located in the first recess 230 , so that the first recess 230 is formed as an annular soldering chamber, and the soldering chamber communicates with each of the shunts 170 . The discharge port 172 is disposed in the second groove 240. The annular shaped protrusion 250 surrounds the forming column 143, and the annular forming protrusion 250 is between the forming column 143. Having a forming flow path S, the forming flow path S communicates with the welding chamber. Referring to FIG. 3, the horizontal axis L and a ring wall 251 of the annular shaped convex portion 250 have a fourth distance D4. The fourth distance D4 is a vertical distance from the ring wall 251 to the horizontal axis L, and the fourth distance D4 is greater than the first distance D1.

Referring to FIGS. 3 and 8 , the metal ingot 400 flows to the welding chamber through each of the discharge ports 172 , and the metal ingot 400 covers the welding column 142 in the welding chamber, and the metal ingot 400 passes through the welding ingot 400 The welding chamber enters the forming channel S and is extruded into a metal tube (not shown). The distance between the annular forming protrusion 250 and the forming column 143 is the wall of the metal tube. Thick, because the fourth distance D4 between the transverse axis L and the annular wall 251 of the annular shaped convex portion 250 is greater than the first distance between the transverse axis L and the edge 171a of the inlet 171 D1, so that the metal pipe having an outer diameter larger than the outer diameter of the metal ingot 400 can be extruded. In the embodiment, the horizontal axis L and a ring surface 143a of the forming column 143 have a fifth distance D5. The five distance D5 is a vertical distance from the surface 143a to the horizontal axis L, and the fifth distance D5 is not less than the first distance D1.

Referring to the figures 2, 4 and 5, in the embodiment, the axis L is centered, and in the branching channel 170, the third wall surface 175 and the fourth wall surface 176 have an arc distance D6. The arc distance D6 is gradually reduced from the second surface 160 toward the first surface 150, and the arc distance D6 is gradually reduced from the second surface 160 toward the first surface 150, so that the metal ingot 400 material enters the welding. The resistance when closing the room becomes smaller.

Referring to FIGS. 3 and 8, in the embodiment, the forming column 143 has a first thickness H1 along a direction parallel to the axis L, and the annular forming protrusion 250 has a second thickness H2. The thickness H1 is greater than the second thickness H2. When the metal ingot 400 passes through the forming flow path S, the extrusion pressure can be prevented to cause deformation or offset of the forming column 143, resulting in uneven wall thickness of the metal pipe.

Referring to FIG. 8, the forming column 143 has a first feeding end edge 143b and a first discharging end edge 143c. The annular forming convex portion 250 has a second feeding end edge 250a and a second output. The material edge 250b has a seventh distance H3 between the first feed end edge 143b and the third surface 210 along the parallel axis direction, and the second feed end edge 250a to the third surface 210 There is an eighth distance H4, which is smaller than the eighth distance H4. When the metal ingot 400 material enters the forming flow path S through the dividing channel 170, the metal ingot 400 contacts the forming column 143. The first material edge 143b, the first material edge 143b can prevent the metal ingot 400 from flowing out of the welding chamber, that is, from the forming channel S. Preferably, the first portion of the forming column 143 The feeding end edge 143b and the second feeding end edge 250a of the annular forming convex portion 250 are respectively formed with arcuate chamfers, each of which reduces the resistance of the flow of the metal ingot 400 and avoids stress The forming column 143 and the annular forming convex portion 250 are concentrated to deform or shift the forming column 143.

The scope of the present invention is defined by the scope of the appended claims, and any changes and modifications made by those skilled in the art without departing from the spirit and scope of the invention are within the scope of the present invention. .

10‧‧‧Mold structure of extruded metal pipe

100‧‧‧Split mold

110‧‧‧ chamber

120‧‧‧Circle wall

130‧‧‧桁

140‧‧‧Cylinder

141‧‧ ‧ shunt column

142‧‧‧welding column

143‧‧‧ Forming column

143a‧‧‧ ring surface

143b‧‧‧first feeding edge

143c‧‧‧first discharge edge

150‧‧‧ first surface

160‧‧‧ second surface

170‧‧ ‧ runner

171‧‧‧Inlet

171a‧‧‧ edge

172‧‧‧Outlet

173‧‧‧First wall

174‧‧‧ second wall

175‧‧‧ third wall

176‧‧‧ fourth wall

200‧‧‧Forming mould

210‧‧‧ third surface

220‧‧‧ fourth surface

230‧‧‧First groove

240‧‧‧second groove

250‧‧‧Circular forming convex

250a‧‧‧second feed edge

250b‧‧‧second discharge edge

251‧‧‧Circle

300‧‧‧ Ingot barrel

310‧‧‧ accommodating space

400‧‧‧metal ingots

500‧‧‧Extrusion head

D1‧‧‧First distance

D2‧‧‧Second distance

D3‧‧‧ third distance

D4‧‧‧ fourth distance

D5‧‧‧ fifth distance

D6‧‧‧ arc distance

H1‧‧‧first thickness

H2‧‧‧second thickness

H3‧‧‧ seventh distance

H4‧‧‧ eighth distance

L‧‧‧ horizontal axis

R‧‧‧Chamfer

W‧‧‧thickness

Fig. 1 is an exploded perspective view showing the "mold structure of an extruded metal pipe" of the present invention. Fig. 2 is a perspective view showing a "split mold" of the "die structure of the extruded metal pipe" of the present invention. Fig. 3 is a cross-sectional view showing the "mold structure of extruded metal pipe" of the present invention. Fig. 4 is a cross-sectional view showing the "split mold" of the present invention. Fig. 5 is a cross-sectional view showing the "split mold" of the present invention. Fig. 6 is a perspective cross-sectional view showing the "split mold" of the present invention. Fig. 7 is a top view of the "split mold" of the present invention. Fig. 8 is a partial cross-sectional view showing the "mold structure of an extruded metal pipe" of the present invention.

Claims (11)

A mold structure for extruding a metal tube, comprising: a split mold comprising a chamber, a ring wall, a plurality of trusses, a column, a first surface and a second surface, the column comprising a shunt column, a a welding column and a forming column, the welding column is located between the dividing column and the forming column, the dividing column and the truss are disposed in the chamber, the dividing column is a tapered column, and the dividing column is a tapered column The truss is respectively connected to the shunt column and the ring wall, so that the chamber is formed with a plurality of shunting passages, and the adjacent shunting passages are separated by a truss, and each of the shunting props has an inlet port and a discharge port. a first wall surface, a second wall surface, a third wall surface and a fourth wall surface, the inlet port is located on the first surface, the discharge port is located on the second surface, and the first wall surface is the ring wall An inner wall surface, the second wall surface faces the first wall surface, and the second wall surface is a surface of the shunt column, wherein the third wall surface and the fourth wall surface are side wall surfaces of adjacent two trusses respectively The axis passes through a center of the forming column, the transverse axis and an edge of the inlet opening a first distance, the first distance being a maximum distance between the horizontal axis and the edge, the transverse axis having a second distance from the first wall surface, and a third distance between the horizontal axis and the second wall surface a distance that is gradually reduced by the second surface toward the first surface until the second distance D2 is substantially equal to the first distance D1, the third distance being from the second surface toward the first surface And gradually forming a mold, coupled to the split mold, the forming mold comprising a third surface, a fourth surface, a first groove, a second groove and an annular shaped protrusion, the third The surface faces the second surface of the shunt mold, the first groove is recessed on the third surface, the second groove is recessed on the fourth surface, and the first groove communicates with the second groove, The shunt passage is connected to the first groove, the first groove is located between the shunt channel and the second groove, the welding column is located in the first groove, and the annular forming protrusion is disposed on the a second groove, the annular shaped convex portion surrounds the forming column, and the annular shaped convex portion With the shaping of the column There is a forming flow path between the transverse axis and a ring wall of the annular shaped convex portion, the fourth distance being greater than the first distance. The mold structure of the extruded metal pipe according to claim 1, wherein the first wall surface is an arc-shaped inclined surface, and the second distance is a radius of the arc-shaped inclined surface, wherein the radius of the arc-shaped inclined surface is The two surfaces taper toward the first surface. The mold structure of the extruded metal pipe according to claim 1 or 2, wherein the splitter column is a cone, the third distance is a radius of the cone, and the radius of the cone is from the second surface toward the first A surface direction gradually shrinks. The mold structure of the extruded metal pipe according to claim 1, wherein the second wall surface of the branch passage is substantially parallel to the first wall surface. The mold structure of the extruded metal pipe according to claim 3, wherein the second wall surface of the branch passage is substantially parallel to the first wall surface. The mold structure of the extruded metal pipe according to claim 1, wherein the transverse axis has a fifth distance from a ring surface of the forming column, and the fifth distance is not less than the first distance. The mold structure of the extruded metal pipe according to claim 1, wherein the axis is centered, and in the branching channel, the third wall surface and the fourth wall surface have an arc distance, and the arc distance is The second surface tapers toward the first surface. The mold structure of the extruded metal pipe according to claim 1, wherein the forming column has a first thickness along a direction parallel to the axis, and the annular shaped convex portion has a second thickness, the first The thickness is greater than the second thickness. The mold structure of the extruded metal pipe according to claim 1 or 8, wherein the forming column has a first feed end edge and a first discharge end edge, and the annular shaped convex portion has a first Second entry a material end edge and a second discharge end edge, along a direction parallel to the axis, a first distance between the first feed end edge and the third surface, the second feed end edge to the third There is an eighth distance between the surfaces, the seventh distance being smaller than the eighth distance. The mold structure of the extruded metal pipe according to claim 1 or 8, wherein a first feeding end edge of the forming column and a second feeding end edge of the annular forming convex portion are respectively formed Arc chamfered. The mold structure of the extruded metal pipe according to claim 1 or 8, wherein each of the trusses has a thickness which gradually decreases from the first surface toward the second surface.