JP2009214167A - Die casting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die casting device which has satisfactory cooling performance to an injection sleeve, and also can suppress the leak out of a refrigerant. <P>SOLUTION: Disclosed is a die casting device having an injection sleeve 140 for injecting molten metal to the inside of a die. The injection sleeve 140 includes: a cylindrical casing part 142; a ring-shaped casing part 152; an annular packing member 141; and a refrigerant passage S1. The cylindrical casing part 142 has one end part in which a screw part is formed at the outer circumferential face, and is used for allowing the molten metal to pass. The ring-shaped casing part 152 is arranged so as to surround the outer circumference of the cylindrical casing part 142, and has one end part in which a screw part screwed with the above screw part is formed at the inner circumferential face. The annular packing member 141 is arranged between the other end part of the ring-shaped casing part 152 and the cylindrical casing part 142. The refrigerant passage S1 is composed of a space between the cylindrical casing part 142 and the ring-shaped casing part 152, and is sealed by the screwing of the screw parts and the annular packing member 141. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a die casting apparatus.

In the die casting apparatus, by arranging a cooling-only sleeve on the outer periphery of the injection sleeve, the temperature of the injection sleeve is kept constant and overheating is avoided (see, for example, Patent Document 1).
JP-A-9-103863

  However, there is a problem that an air gap is generated between the injection sleeve and the cooling dedicated sleeve, and the heat transfer rate is lowered. In addition, since it is indirect cooling, a rapid and large amount of heat input from the molten metal to the injection sleeve cannot be removed with good responsiveness, and thus it is necessary to set a long time for solidification.

  On the other hand, it is possible to cool the injection sleeve directly by arranging the refrigerant passage in the injection sleeve and sealing the end of the refrigerant passage by welding, so that the heat transfer coefficient is not reduced. Have a problem to do. For example, the temperature of the inner wall portion of the injection sleeve rises rapidly every time heat is input from the molten metal, whereas the outer wall portion separated by the refrigerant passage has almost no temperature change. Thus, the difference in the amount of thermal deformation is greatly generated. For this reason, stress concentration occurs in the welded portion and cracks occur in the welded portion, so that the refrigerant flowing through the refrigerant passage may leak to the outside and / or the inside of the injection sleeve. In particular, when the refrigerant leaks into the injection sleeve, the refrigerant is caught in the molten metal, which causes a problem of deterioration in casting quality such as a casting hole and poor hot water circulation.

  The present invention has been made to solve the above-described problems associated with the prior art, and an object of the present invention is to provide a die casting apparatus that has good cooling performance for the injection sleeve and can suppress leakage of the refrigerant.

  One aspect of the present invention for achieving the above object is a die casting apparatus having an injection sleeve for injecting molten metal into a mold, and the injection sleeve includes a cylindrical casing portion, a ring-shaped casing portion, and an annular packing. It has a member and a refrigerant passage. The said cylindrical casing part has an end part in which a thread part is formed in an outer peripheral surface, and is used in order to let a molten metal pass. The said ring-shaped casing part is arrange | positioned so that the outer periphery of a cylindrical casing part may be enclosed, and has the one end part in which the screw part screwed together with the said screw part is formed in an internal peripheral surface. The said annular packing member is arrange | positioned between the other end part of a ring-shaped casing part, and a cylindrical casing part. The refrigerant passage is constituted by a space between the cylindrical casing portion and the ring-shaped casing portion, and is sealed by screwing of the screw portion and an annular packing member.

  According to the uniform phase of the present invention, only the wall of the cylindrical casing portion is interposed between the molten metal passing through the inside of the cylindrical casing portion and the refrigerant flowing through the refrigerant passage, and direct cooling is performed. Therefore, it has a good cooling performance with respect to the injection sleeve, and can deheat with good responsiveness even when a large amount of heat is input from the molten metal to the injection sleeve. On the other hand, the sealing performance of the refrigerant passage is ensured by screwing of the threaded portion and the annular packing member, and the durability against material expansion and contraction due to thermal stress is improved, so that leakage of the refrigerant can be suppressed. is there. That is, it is possible to provide a die casting apparatus that has good cooling performance for the injection sleeve and can suppress the leakage of the refrigerant.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially broken perspective view for explaining a die casting apparatus according to an embodiment of the present invention.

  The die casting apparatus 100 is a cold chamber type, and includes a fixed mold (mold) 110, a movable mold (mold) 115, a mold clamping section 120, an injection section 130, a holding furnace 180, a hot water supply pipe 182, a pressure reducing apparatus 185, and a cooling apparatus. 194 and controller 198.

  The fixed mold 110 and the movable mold 115 have cavities 111 and 116 corresponding to the outer shape of the molded product, and are detachably fixed to the platens 113 and 118. The molded article is, for example, an automobile body part or a suspension part. The vehicle body parts are, for example, joints of pillars, roofs, and space frames. The suspension parts are a suspension arm, a subframe, a suspension link part, and an engine cradle. The molten metal M injected into the cavities 111 and 116 is, for example, an aluminum alloy. An aluminum alloy is preferable in terms of weight reduction of the vehicle.

  The mold clamping unit 120 is used for clamping the fixed mold 110 and the movable mold 115 and has a reciprocating mechanism for driving the movable mold 115 toward and away from the fixed mold 110. The reciprocating mechanism is composed of, for example, a hydraulic cylinder, and is coupled to a platen 118 that fixes the movable die 115.

  The injection unit 130 is used to inject the molten metal M constituting the molded product into the cavities 111 and 116, and includes a sleeve unit 132, an injection tip 134, a piston rod 136, and a vacuum chamber 138.

  The sleeve portion 132 includes an injection sleeve 140 supported by the platen 113 to which the fixed mold 110 is fixed, and a sprue bush 160 communicating with the cavity 111 of the fixed mold 110, and constitutes a molded product. Used to supply molten metal M. The injection sleeve 140 and the gate bush 160 have a refrigerant passage disposed therein in order to maintain a constant temperature and avoid overheating. The refrigerant is, for example, water. In addition, it is possible to arrange the refrigerant passage only in the injection sleeve 140 as necessary.

  The injection tip 134 is inserted into the sleeve portion 132 so as to be movable forward and backward. A clearance of about 0.05 to 0.5 mm, for example, is secured between the injection tip 134 and the sleeve portion 132 in consideration of thermal expansion and the like.

  The piston rod 136 has a smaller diameter than the injection tip 134, is fixed to the rear of the injection tip 134, and is driven by a reciprocating mechanism (not shown). Therefore, when the piston rod 136 is moved forward, the injection tip 134 advances toward the cavity 111 of the fixed mold 110 through the inside of the sleeve portion 132, so that the molten metal M held by the sleeve portion 132 is transferred to the cavities 111, 111. It is possible to inject inside 116.

  The vacuum chamber 138 is concentrically disposed at the rear end portion of the sleeve portion 132 and is connected to a piping system (not shown) extending from the decompression device 185, and the sleeve portion 132 when the molten metal M is injected. It is used to relax the thermal conditions of the rear end portion and the seal member (not shown).

  Thereby, it is possible to maintain a stable vacuum state by applying a sealing member having a relatively low heat resistance but having a good sealing property, for example, a resin packing member such as nitrile rubber or fluorine rubber. . The capacity of the vacuum chamber 138 is preferably set as appropriate in consideration of the heat insulating effect, interference with peripheral devices, the time required for reducing the pressure, and the like.

  The holding furnace 180 has a heating device 181 that maintains the temperature of the molten metal M, and holds the molten metal M in a state that does not solidify. The heating device 181 is, for example, a heater. The temperature of the holding furnace 180 is, for example, 700 ° C. when the molten metal M is an aluminum alloy.

  The hot water supply pipe 182 has an end portion fixed to the rear end portion of the sleeve portion 132 and an end portion reaching the inside of the molten metal M of the holding furnace 180, and the molten metal M of the holding furnace 180 is attached to the sleeve portion 132. Used to introduce. A heating device (not shown) for maintaining the temperature is disposed on the outer periphery of the hot water supply pipe 182. Reference numeral 183 denotes a fixing jig for fixing one end of the hot water supply pipe 182 to the rear end portion of the sleeve portion 132, and includes, for example, a holding bracket and a set screw.

  The decompression device 185 includes a vacuum pump 186, a buffer vacuum tank 187, and a vacuum piping system 190, and is used to suck air inside the cavities 111 and 116 after completion of mold clamping. The vacuum pump 186 is not particularly limited, and is, for example, a reciprocating mechanical pump such as a piston pump or a rotary mechanical pump such as an oil rotary pump. The buffer vacuum tank 187 is disposed between the vacuum pump 186 and the vacuum piping system 190, and is used to maintain a stable vacuum state.

  The vacuum piping system 190 extends to the cavities 111 and 116 of the fixed mold 110 and the movable mold 115 in order to suck the air inside the cavities 111 and 116, and pipe opening / closing devices 191 and 192 are arranged on the way. ing. The pipe opening / closing device 191 is composed of, for example, an electromagnetic valve, and can release the vacuum pipe system 190 by releasing the connection (communication) with the vacuum pump 186 and the buffer vacuum tank 187. The pipe opening / closing device 192 includes, for example, a vacuum valve, is disposed in the middle of the piping between the pipe opening / closing device 191 and the cavities 111 and 116, and is positioned in the vicinity of the cavities 111 and 116.

  Therefore, by setting the pipe opening / closing device 191 and the pipe opening / closing device 192 to the “open” state, the buffer vacuum tank 187 communicates with the inside of the cavities 111, 116, and the air inside the cavities 111, 116 is sucked. Is possible.

  The cooling device 194 includes a cooling piping system 195 and a cooling pump 196. The cooling pipe system 195 is connected to the refrigerant passages of the injection sleeve 140 and the gate bush 160. For example, the refrigerant supplied from the cooling pipe system 195 by the cooling pump 196 is introduced from the inlet (not shown) of the refrigerant passage of the injection sleeve 140, and after cooling the injection sleeve while passing through the refrigerant passage of the injection sleeve, After being introduced into the inlet (not shown) of the coolant passage of the gate bush 160 and cooling the gate bush 160, it is returned to the cooling piping system 195 from the outlet (not shown) of the coolant passage of the gate bush 160. The refrigerant passage of the injection sleeve 140 and the refrigerant passage of the gate bush 160 can be made independent to circulate the refrigerant.

  The control device 198 includes a reciprocating mechanism of the mold clamping unit 120, a reciprocating mechanism of the piston rod 136, a heating device 181 of the holding furnace 180, a heating device of the hot water supply pipe 182, a vacuum pump 186, pipe opening and closing devices 191, 192, and Used to control the cooling pump 196 of the cooling device 194.

  Next, the injection sleeve 140 and the gate bush 160 will be described in detail. 2 is a sectional view for explaining the sleeve portion shown in FIG. 1, FIG. 3 is an exploded sectional view for explaining the injection sleeve shown in FIG. 2, and FIG. 4 is a gate bush shown in FIG. It is a disassembled sectional view for demonstrating.

  As shown in FIGS. 2 and 3, the injection sleeve 140 includes an inner divided body (cylindrical casing portion) 142 through which the molten metal passes, and an outer divided body (ring shape) disposed so as to surround the outer periphery of the inner divided body 142. Casing part) 152 and an O-ring (annular packing member) 141 disposed between the inner divided body 142 and the outer divided body 152.

  The inner divided body 142 has a shaft-shaped hollow portion 143 and a flange portion (one end portion of the cylindrical casing portion) 144 and is used for transferring the molten metal M to the gate bush 160. The shaft-shaped hollow portion 143 has a constant outer diameter and inner diameter, and has an annular recess 148 formed to extend in the circumferential direction, and is inserted into the outer divided body 152.

  The annular recess 148 is used for positioning and arranging the O-ring 141. The material of the O-ring 141 is not particularly limited as long as it has good heat resistance and sealing properties. For example, a nitrile rubber-based, silicon-based, or fluorine-based synthetic resin can be applied.

  The flange portion 144 is a portion connected to the gate bush 160 and has a screw portion 146 disposed on the outer peripheral surface.

  The outer divided body 152 includes a ring-shaped hollow portion 153, an opening (one end portion of the ring-shaped casing portion) 154, and an opening (the other end portion of the ring-shaped casing portion) 155. The hollow portion 143 is inserted. The inner diameter of the ring-shaped hollow portion 153 substantially matches the outer diameter of the flange portion 144 of the inner divided body 142 and is larger than the outer diameter of the axial hollow portion 143 of the inner divided body 142.

  Therefore, when the shaft-shaped hollow portion 143 of the inner divided body 142 is inserted into the ring-shaped hollow portion 153, a space is formed between the inner peripheral surface of the ring-shaped hollow portion 153 and the outer peripheral surface of the shaft-shaped hollow portion 143. Is done. The space constitutes a refrigerant passage S1 for cooling the injection sleeve 140, and communicates with the refrigerant passage of the gate bush 160 and the cooling piping system 195. That is, the injection sleeve 140 has a refrigerant passage formed by a space between the inner divided body 142 and the outer divided body 152.

  The opening 154 is located on the end surface on the side of the gate bush, and the inner diameter thereof is the same as the inner diameter of the ring-shaped hollow portion 153, and has a screw portion 156 disposed on the inner peripheral surface. Further, when the shaft-shaped hollow portion 143 of the inner divided body 142 is inserted into the ring-shaped hollow portion 153, the inner peripheral surface of the opening 154 is in contact with the outer peripheral surface of the flange portion 144 of the inner divided body 142. Is set.

  The threaded portion 156 is configured to screw with the threaded portion 146 of the inner split body 142 to produce a metal-to-metal seal. Therefore, it is possible to seal between the opening portion 154 of the outer divided body 152 and the flange portion 144 of the inner divided body 142 by screwing the screw portions 146 and 156.

  The screw portions 146 and 156 are not particularly limited as long as they are configured to generate a metal-to-metal seal. For example, pipe screws can be applied. The pipe screw is a triangular screw having a crest angle of 55 ° used for connecting a pipe, a pipe part, a fluid device, etc., and a taper screw is preferable from the viewpoint of sealing performance.

  The opening 155 is positioned on the end surface on the injection chip side (the end surface on the opposite side of the opening 154), the inner diameter thereof is smaller than the inner diameter of the ring-shaped hollow portion 153, and the axial hollow portion of the inner divided body 142 143 substantially matches the inner diameter of 143. Further, the inner peripheral surface of the opening 155 is aligned so as to face the annular recess 148 of the inner divided body 142 when the shaft-shaped hollow portion 143 of the inner divided body 142 is inserted into the ring-shaped hollow portion 153. Yes.

  Therefore, due to the presence of the O-ring 141 disposed in the annular recess 148 formed in the axial hollow portion 143 of the inner divided body 142, the opening 155 of the outer divided body 152 and the axial hollow portion 143 of the inner divided body 142 In the meantime, it is possible to provide a sealing property. That is, it is possible to seal between the opening 155 of the outer divided body 152 and the inner divided body 142 by the O-ring 141.

  In the injection sleeve 140, as described above, the refrigerant passage S1 is formed by inserting the inner divided body 142 through the outer divided body 152, and the molten metal M passing through the inside of the inner divided body 142 and the refrigerant passage S1 are formed. Only the wall portion of the axial hollow portion 143 of the inner divided body 142 is interposed between the circulating refrigerant and, for example, there is no air gap that reduces the heat transfer coefficient. That is, since it is direct cooling, it has a good cooling performance for the injection sleeve 140, and it can also remove heat with a responsive response to a sudden and large amount of heat input from the molten metal M to the injection sleeve 140. Can do.

  On the other hand, the sealing performance of the refrigerant passage S1 is ensured by screwing of the screw portions 146 and 156 and the O-ring 141, and, for example, joining such as welding is not applied. Therefore, durability against material expansion and contraction due to thermal stress is improved, and leakage of the refrigerant can be suppressed. That is, it is possible to provide the die casting apparatus 100 that has good cooling performance for the injection sleeve 140 and can suppress the leakage of the refrigerant.

  Further, since the durability is improved, the life of the injection sleeve 140 can be extended, and the injection sleeve 140 can be disassembled, so that the refrigerant passage S1 can be easily maintained.

  Note that when the screw portions 146 and 156 are screwed together, the end surface on the side of the sprue bushing in the flange portion 144 of the inner divided body 142 is set to protrude from the end surface on the side of the sprue bushing in the opening 154 of the outer divided body 152. ing. Therefore, even when the accuracy of the screw portions 146 and 156 and the aging of the screws cause a movement such that the outer divided body 152 protrudes relatively from the inner divided body 142, the occurrence of molten metal leakage is prevented. .

  Next, the gate gate bush will be described with reference to FIGS.

  The spout bush 160 is disposed between the spout of the fixed mold 110 and the injection sleeve 140 and surrounds the outer periphery of the inner divided body (cylindrical casing portion) 162 and the inner divided body 162 through which the molten metal M from the injection sleeve 140 passes. And the outer divided body (ring-shaped casing portion) 172 and the O-ring (annular packing member) 161 disposed between the inner divided body 162 and the outer divided body 172.

  The inner divided body 162 includes a shaft-shaped hollow portion 163, a flange portion (one end portion of the cylindrical casing portion) 164, a step portion (the other end portion of the cylindrical casing portion) 167, and a reduced diameter portion 165. The divided body 172 is inserted.

  The axial hollow portion 163 has a tapered inner diameter, but the outer diameter is constant. The flange portion 164 is located on the end surface of the gate and has a screw portion 166 disposed on the outer peripheral surface. The stepped portion 167 is a transition portion between the axial hollow portion 163 and the reduced diameter portion 165, and has an annular recess 168 extending in the circumferential direction. The annular recess 168 is used for positioning and arranging the O-ring 161. The material of the O-ring 161 is not particularly limited as long as it has good heat resistance and sealing properties, like the material of the O-ring 141 of the injection sleeve 140.

  The reduced diameter portion 165 is located on the end surface on the injection sleeve side, and the inner diameter thereof coincides with the inner diameter of the flange portion 144 of the injection sleeve 140.

  The outer divided body 172 includes a ring-shaped hollow portion 173, an opening (one end portion of the ring-shaped casing portion) 174, and an opening (the other end portion of the ring-shaped casing portion) 175. The hollow portion 163 is inserted. The inner diameter of the ring-shaped hollow portion 173 substantially matches the outer diameter of the flange portion 164 of the inner divided body 162 and is larger than the outer diameter of the shaft-shaped hollow portion 163 of the inner divided body 162.

  Therefore, when the shaft-shaped hollow portion 163 of the inner divided body 162 is inserted into the ring-shaped hollow portion 173, there is a gap between the inner peripheral surface of the ring-shaped hollow portion 173 and the outer peripheral surface of the shaft-shaped hollow portion 163 of the inner divided body 162. A space is formed. The space constitutes a refrigerant passage S2 for cooling the gate bush 160, and communicates with the refrigerant passage S1 of the injection sleeve 140 and the cooling piping system 195. That is, the gate bush 160 has a refrigerant passage constituted by a space between the inner divided body 162 and the outer divided body 172.

  The opening 174 is located on the end surface of the gate and has an inner diameter that is the same as the inner diameter of the ring-shaped hollow portion 173 and has a screw portion 176 disposed on the inner peripheral surface. Further, when the shaft-shaped hollow portion 163 of the inner divided body 162 is inserted into the ring-shaped hollow portion 173, the inner peripheral surface of the opening 174 is set to contact the outer peripheral surface of the flange portion 164 of the inner divided body 162. Has been.

  The threaded portion 176 is configured to threadably engage with the threaded portion 166 of the inner split body 162 to produce a metal-to-metal seal. Therefore, it is possible to seal between the opening 174 of the outer divided body 172 and the flange portion 164 of the inner divided body 162 by screwing the screw parts 166 and 176 together. The threaded portions 166 and 176 are not particularly limited as long as the threaded portions 166 and 176 generate a metal-to-metal seal, similarly to the threaded portions 146 and 156 of the injection sleeve 140.

  The opening 175 is located on the end surface on the injection sleeve side, and the inner diameter thereof is smaller than the inner diameter of the ring-shaped hollow portion 173 and substantially coincides with the inner diameter of the shaft-shaped hollow portion 163 of the inner divided body 162. Further, the inner peripheral surface of the opening 175 is aligned so as to face the reduced diameter portion 165 of the inner divided body 162 when the shaft-shaped hollow portion 163 of the inner divided body 162 is inserted into the ring-shaped hollow portion 173. The stepped portion 167 of the inner divided body 162 is in contact with the outer peripheral portion of the opening 175.

  Therefore, the presence of the O-ring 161 disposed in the annular recess 168 of the stepped portion 167 provides a sealing property between the opening 175 of the outer divided body 172 and the axial hollow portion 163 of the inner divided body 162. Is possible. That is, it is possible to seal between the opening 175 of the outer divided body 172 and the stepped portion 167 of the inner divided body 162 by the O-ring 161.

  In the gate bush 160, as described above, the refrigerant passage S2 is formed by inserting the inner divided body 162 through the outer divided body 172, and the molten metal M passing through the inner divided body 162 and the refrigerant passage S2 are formed. Only the wall portion of the axial hollow portion 163 of the inner divided body 162 is interposed between the circulating refrigerant and, for example, there is no air gap that reduces the heat transfer coefficient. That is, since it is direct cooling, it has a good cooling performance for the sprue bush 160, and heat can be removed with good responsiveness even when a large amount of heat is input from the molten metal M to the sprue bush 160. Can do.

  On the other hand, the sealing performance of the refrigerant passage S2 is ensured by screwing of the screw portions 166 and 176 and the O-ring 161, and, for example, joining such as welding is not applied. Therefore, durability against material expansion and contraction due to thermal stress is improved, and leakage of the refrigerant can be suppressed. Further, since the durability is improved, the life of the gate bush 160 can be extended, and the gate bush 160 can be disassembled, so that the refrigerant passage S2 can be easily maintained.

  When the screw portions 166 and 176 are screwed together, the injection sleeve side end surface of the reduced diameter portion 165 of the inner divided body 162 is set to protrude from the injection sleeve side end surface of the opening 175 of the outer divided body 172. Has been. Therefore, even when the accuracy of the screw portions 166 and 176 and the aging of the screws cause a movement in which the outer divided body 172 protrudes relatively from the inner divided body 162, the occurrence of molten metal leakage is prevented. .

  As described above, in the injection sleeve and the sprue bush according to the present embodiment, the refrigerant passage is formed by inserting the inner divided body into the outer divided body, and the molten metal and the refrigerant passing through the inside of the inner divided body. Since only the wall of the axial hollow portion of the inner divided body is interposed between the refrigerant flowing through the passage and direct cooling, it has good cooling performance for the injection sleeve and the gate bush. The heat can be removed with high responsiveness even when a large amount of heat is input from the molten metal to the injection sleeve and the spout bush.

  On the other hand, the sealing performance of the refrigerant passage is ensured by screwing of the threaded portion and the O-ring, and the durability against material expansion and contraction due to thermal stress is improved, so that leakage of the refrigerant can be suppressed. . That is, the present embodiment can provide a die casting apparatus that has good cooling performance for the injection sleeve and the gate bush and can suppress the leakage of the refrigerant.

  Further, since the durability is improved, the life of the injection sleeve and the gate bush can be extended, and since the injection sleeve and the gate bush can be disassembled, the refrigerant passage can be easily maintained. .

  In the injection sleeve, when the screw portion is screwed, the end face on the side of the sprue bush on the flange portion of the inner divided body is set to protrude from the end face on the side of the sprue bush on the opening portion of the outer divided body. Further, in the sprue bush, when the screw portion is screwed, the injection sleeve side end surface of the reduced diameter portion of the inner divided body is set to protrude from the injection sleeve side end surface of the opening portion of the outer divided body. . Therefore, even when movement of the outer divided body relatively projecting from the inner divided body is caused by poor accuracy of the threaded portion or aging of the screw, occurrence of molten metal leakage is prevented.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the die casting apparatus is not limited to a form using a cold chamber type and a vacuum apparatus, and a hot chamber type or a form in which a molten metal is injected under atmospheric pressure can be applied. It is also possible to apply a non-porous die casting method.

  The annular recess in which the O-ring related to the injection sleeve is disposed can be formed on the inner peripheral surface of the opening of the outer divided body. The annular recess in which the O-ring relating to the gate bush is disposed can be formed on the outer peripheral portion of the opening of the outer divided body that comes into contact with the stepped portion of the inner divided body.

It is a partially broken perspective view for demonstrating the die-casting apparatus which concerns on embodiment of this invention. It is sectional drawing for demonstrating the sleeve part shown by FIG. FIG. 3 is an exploded sectional view for explaining an injection sleeve shown in FIG. 2. FIG. 3 is an exploded cross-sectional view for explaining a gate gate shown in FIG. 2.

Explanation of symbols

100 die casting equipment,
110 Fixed mold (mold),
111 cavities,
113 platens,
115 Movable mold (mold),
116 cavities,
118 platens,
120 mold clamping part,
130 injection part,
132 sleeve part,
134 injection chip,
136 piston rod,
138 vacuum chamber,
140 injection sleeve,
141 O-ring (annular packing member),
142 inner divided body (cylindrical casing part),
143 axial hollow part,
144 flange part (one end part of a cylindrical casing part),
146 thread,
148 annular recess,
152 outer divided body (ring-shaped casing part),
153 ring-shaped hollow part,
154 opening (one end of the ring-shaped casing),
155 opening (the other end of the ring-shaped casing),
156 thread,
160
161 O-ring (annular packing member),
162 inner divided body (cylindrical casing part),
163 axial hollow part,
164 flange portion (one end portion of the cylindrical casing portion),
165 reduced diameter part,
166 threaded part,
167 Stepped portion (the other end of the cylindrical casing portion),
168 annular recess,
172 outer divided body (ring-shaped casing part),
173 ring-shaped hollow part,
174 opening (one end of the ring-shaped casing),
175 opening (the other end of the ring-shaped casing),
176 thread,
180 holding furnace,
181 heating device,
182 Hot water pipe,
183 fixing jig,
185 decompressor,
186 vacuum pump,
187 buffer vacuum tank,
190 vacuum piping system,
191,192 Piping switchgear,
194 Cooling device 195 Cooling piping system 196 Cooling pump 198 Control device,
M molten metal,
S1, S2 Refrigerant passage.

Claims (4)

It has an injection sleeve for injecting molten metal into the mold,
The injection sleeve is
A cylindrical casing portion having a threaded portion formed on the outer peripheral surface, through which the molten metal passes,
A ring-shaped casing portion having one end portion disposed on an inner peripheral surface of a screw portion that is disposed so as to surround an outer periphery of the cylindrical casing portion;
An annular packing member disposed between the other end portion of the ring-shaped casing portion and the cylindrical casing portion; and
A refrigerant passage formed by a space between the cylindrical casing portion and the ring-shaped casing portion;
The die passage device is characterized in that the refrigerant passage is sealed by screwing of the threaded portion and the annular packing member.   The end surface of the one end portion of the cylindrical casing portion is set to protrude from the end surface of the one end portion of the ring-shaped casing portion when the screw portion is screwed. The die-casting device described in 1. Having a gate bush disposed between the gate of the mold and the injection sleeve;
The gate bush is
A cylindrical casing portion having a threaded portion formed on the outer peripheral surface, through which the molten metal passes,
A ring-shaped casing portion having one end portion disposed on an inner peripheral surface of a screw portion that is disposed so as to surround an outer periphery of the cylindrical casing portion;
An annular packing member disposed between the other end portion of the ring-shaped casing portion and the other end portion of the cylindrical casing portion; and
A refrigerant passage formed by a space between the cylindrical casing portion and the ring-shaped casing portion;
The die casting apparatus according to claim 1, wherein the refrigerant passage is sealed by screwing of the threaded portion and the annular packing member.   In the gate bush, the end surface of the other end portion of the cylindrical casing portion is set to protrude from the end surface of the other end portion of the ring-shaped casing portion when the screw portion is screwed. The die casting apparatus according to claim 3.

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