JP2009028740A - Main cylinder for injection-pump, and hot-chamber die-casting machine using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a main cylinder for injection-pump, and a hot-chamber die-casting machine using the main cylinder with which even in the case of solidifying by inserting molten metal into a small gap between an inner cylinder and an outer cylinder and caused by that, the pressurized force is generated, the casting can successively and smoothly be performed without breaking the outer cylinder. <P>SOLUTION: The main cylinder 2 for injection pump is provided with the inner cylinder 2a for inserting a plunger 11 and the outer cylinder 2b surrounding the inner cylinder 2a, and is in the injection pump for hot-chamber die-casting machine 1 is provided with a runner 2d for pouring the molten metal 3 into a forming die 4 in the inner part. The outer cylinder 2b has a thick thickness part, in the case of seeing the cross sectional face, and the runner 2d is provided with the thick thickness part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a main cylinder of an injection pump used for casting molten metal such as lead, zinc, tin, magnesium, aluminum, and alloys thereof, and a hot chamber die casting machine using the same.

  A hot chamber type die casting method in which a chamber (injection mechanism) is disposed in a molten metal (hereinafter referred to as “metal molten metal”) is a molten metal every time it is injected as in a cold chamber type die casting method. Is not a method of supplying molten metal to the injection mechanism, but a method of continuously supplying molten metal to the injection mechanism, so that high productivity, low gas content in the casting, energy saving, and environmental pollution It has many advantages, such as being able to suppress and easy automation. For this reason, in recent years, it has attracted attention as an innovative casting method for lead, zinc, tin, magnesium, aluminum, and alloys thereof.

  In order to obtain a larger cast product or higher productivity, the need for an increase in the size of a hot chamber die casting machine (a hot chamber die casting machine or a hot die casting machine) has increased in recent years. To increase the size of the hot chamber die casting machine, increase the size of the injection pump that injects the molten metal under pressure to the mold, especially the main cylinder that is placed in the injection pump and pressurizes the molten metal with the plunger inserted inside it. It is indispensable to increase the size.

  The main cylinder is usually made of ceramics because it requires heat resistance that can be continuously used in a high-temperature molten metal and wear resistance that suppresses wear due to sliding of the plunger. Increasing the size of the main cylinder increases the pressing force applied to the main cylinder, so that it is necessary to increase the thickness of the main cylinder. However, when the ceramic is thickened, densification during sintering is not sufficient, and so-called sinterability may be reduced, which decreases strength and toughness.

Patent Document 1 discloses a main cylinder that can be increased in size including an inner cylinder and an outer cylinder.
8A and 8B are cross-sectional views of a hot chamber die casting machine 40 disclosed in Patent Document 1, and FIG. 8A is a cross-sectional view (vertical cross section) viewed from the front. (B) is sectional drawing which shows the Ib-Ib longitudinal cross-section of Fig.8 (a).

  A hot chamber die casting machine 40 shown in FIGS. 8A and 8B is connected to a main cylinder 42 composed of an inner cylinder 42a and an outer cylinder 42b, and a side surface of the main cylinder 42, and a molten metal 43 is injected into a mold 44. And an injection mechanism including a nozzle 45 that performs the same operation.

  The molten metal 43 heated by the heater 52 disposed in the lower part of the molten metal tank 47 held in the furnace body 48 passes through the communication hole 53 formed in the side surface of the holding cylinder 46 and is located on the upper side surface of the main cylinder 42. The inside of the main cylinder 42 enters the inside of the main cylinder 42 through the through hole 54 and is pushed by the descending plunger 51, and is fixed through the runner 42 d formed in the main cylinder 42 through the nozzle 45, the sprue bush 55, and the runner portion 56 in order. It is injected into a mold 44 composed of a mold 44a and a movable mold 44b.

  The main cylinder 42 is composed of an inner cylinder 42a and an outer cylinder 42b, and it is sufficient that the total thickness of both reaches a predetermined thickness, and the thickness of the inner cylinder 42a and the outer cylinder 42b can ensure sinterability. Since the thickness can be increased, the size can be easily increased.

JP 2004-141965 A

  However, when the molten metal 43 is pressed by the plunger 51 and passes through the inside of the runner 42d, a part of the molten metal 43 enters a slight gap between the inner cylinder 42a and the outer cylinder 42b, and this causes the outer There was a problem that the tube 42b was damaged.

  That is, the molten metal 43 that has entered the gap between the inner cylinder 42a and the outer cylinder 42b ends casting, stops heating by the heater 52, and solidifies to produce a solidified product when the temperature of the main cylinder 42 decreases. Some oxidize. Then, as the heater 52 is energized for the next casting and the temperature of the main cylinder 42 rises, the solidified material thermally expands while solidifying in the gap between the inner cylinder 42a and the outer cylinder 42b, and the inner cylinder 42a The outer cylinder 42b is pressed. At this time, since a part of the oxidized solidified product has a melting point higher than that of the metal that forms the solidified product, the pressing force may exist even if the melting point of the metal that forms the solidified product is exceeded.

  This pressing force acts on both the outer surface of the inner cylinder 42a and the inner surface of the outer cylinder 42b. In most cases, the outer cylinder 42b is damaged by this pressing force. One reason for this is that the pressing force acts on the inner cylinder 42a in the positive direction of the X axis in FIG. 8A and on the outer cylinder 42b in the negative direction of the X axis. And, since the pressing force in the opposite direction (the negative direction of the X axis) acts on the inner surface of the inner cylinder 42a via the molten metal 43 by the plunger 51, the positive direction of the X axis of the inner cylinder 42a is increased. It is presumed that the pressing force is canceled out and the damage is suppressed. Furthermore, as another reason, there is a rising portion (portion extending along the Z-axis direction) of the runner 42d on the inner surface of the outer cylinder 42b. It is estimated that stress concentration is likely to occur compared to the outer surface.

  The present invention has been devised to solve the above problems, and even if a molten metal 43 enters and solidifies in a slight gap between the inner cylinder 42a and the outer cylinder 42b, and this causes a pressing force. An object of the present invention is to provide a main cylinder for an injection pump that can be continuously and smoothly cast without damaging the outer cylinder 42b, and a hot chamber die casting machine using the same.

  The present invention relates to a main cylinder in an injection pump of a hot chamber die casting machine, which includes an inner cylinder into which a plunger is inserted and an outer cylinder surrounding the inner cylinder, and has a runner for injecting molten metal into a mold. The main cylinder for an injection pump is characterized in that the outer cylinder has a thick part thick when viewed in cross section, and the runner is provided in the thick part. .

  The present invention also relates to an injection pump for a hot chamber die casting machine comprising an inner cylinder into which a plunger is inserted and an outer cylinder surrounding the inner cylinder, and having a runner for injecting molten metal into a mold. An injection pump comprising a main cylinder, wherein a central axis of the inner cylinder is deviated from a central axis of the outer cylinder, and the runner is provided on a side opposite to a direction in which the inner cylinder is deviated. Main cylinder.

  The present invention also relates to an injection pump for a hot chamber die casting machine comprising an inner cylinder into which a plunger is inserted and an outer cylinder surrounding the inner cylinder, and having a runner for injecting molten metal into a mold. A main cylinder, wherein the inner cylinder and the outer cylinder have an elliptical cross-sectional shape, and the runner is provided in a thick portion on the long diameter side when viewed in the cross-section of the outer cylinder. This is a main cylinder for an injection pump.

  The present invention further provides the main cylinder for an injection pump having any one of the above-described structures, characterized in that a rising portion of the runner is provided inside the outer cylinder.

  The present invention further provides a hot chamber die casting machine characterized in that the main cylinder for an injection pump having any one of the above-described configurations is used as an injection pump.

  According to the main cylinder for an injection pump of the present invention, the molten metal enters and solidifies in the gap between the inner cylinder and the outer cylinder, and the outer cylinder is damaged even if a pressing force is generated on the outer cylinder due to this. Casting can be continued. Further, by using the main cylinder for an injection pump according to the present invention, it is possible to provide a large-sized hot chamber die casting machine that can suppress damage to the outer cylinder and can be continuously cast.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, terms indicating specific directions and positions (for example, “up”, “down”, “right”, “left” and other terms including those terms) are used as necessary. These terms are used for easy understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meaning of these terms. Moreover, the part of the same code | symbol which appears in several drawing shows the same part or member.

<Embodiment 1>
1A and 1B are sectional views of a hot chamber die casting machine 1 according to a first embodiment of the present invention. FIG. 1A shows a longitudinal section viewed from the front of the hot chamber die casting machine 1, and FIG. 1B shows a IIb-IIb longitudinal section of FIG. FIG. 2 is an enlarged view of a portion A in FIG. 1 (a), and shows the main cylinder 2 and its peripheral portion which are characteristic portions of the present invention.

  The molten metal tank 7 disposed in the center of the hot chamber die casting machine 1 has a molten metal such as lead, zinc, tin, magnesium, aluminum, etc., or an alloy thereof, which is heated and melted by the heater 12 inside. 3.

  An injection pump is used to inject the pressurized molten metal 3 into the mold 4 through the nozzle 5, the sprue bush 15 and the runner portion 16. The injection pump is composed of a main cylinder 2 and a plunger 11 that reciprocates inside the main cylinder 2, and a nozzle 5 is added thereto to constitute an injection mechanism.

  The main cylinder 2 includes an inner cylinder 2a and an outer cylinder 2b, and is held by a holding cylinder 6 so that the whole is immersed in the molten metal 3. The inner cylinder 2a has a space in which the molten metal 3 and the plunger 11 for pressurizing the molten metal 3 can be inserted, and the bottom is closed by a bottom plate 2c. The outer cylinder 2b is disposed so as to surround the inner cylinder 2a.

  The inner cylinder 2a and the outer cylinder 2b have a through hole 14 that penetrates the inner cylinder 2a and the outer cylinder 2b and is connected to the communication hole 13 of the holding cylinder 6 so that the molten metal 3 is inserted into the inner cylinder 2a. ing.

  The molten metal 3 passing through the through hole 14 and inserted into the inner cylinder 2 a is pressurized by the plunger 11. As the plunger 11 moves along the inner surface of the inner cylinder 2a toward the bottom plate 2c (the negative direction of the Z axis in FIGS. 1 and 2), the molten metal 3 is pressed.

  The pressed metal melt 3 passes through the runner 2d and proceeds to the nozzle 5. In the first embodiment, as shown in FIG. 2, the runner 2d penetrates the inner cylinder 2a in a substantially horizontal direction (negative direction of the X axis in FIG. 2) from a portion close to the bottom plate 2c on the side surface of the inner cylinder 2a. A first horizontal portion, a rising portion that extends the inner surface of the outer cylinder 2 in a substantially vertical direction (Z-axis direction in FIG. 2), and a substantially horizontal direction (the X-axis in FIG. 2) provided on the upper side surface of the outer cylinder 2b. The second horizontal portion penetrating the outer cylinder 2b in the negative direction).

  Since the rising portion of the runner 2d is obtained by providing an opening groove (concave portion) on the inner surface of the outer cylinder 2b, it has an advantage that it is easy to process.

Below, the inner cylinder 2a and the outer cylinder 2b in Embodiment 1, and the detail of the arrangement | positioning are demonstrated.
3 is a cross-sectional view showing a cross-section taken along line III-III in FIG. The description of the cylindrical portion 6a of the holding cylinder 6 is omitted. The inner cylinder 2a has a uniform thickness La over the entire circumference as shown in FIG.

  The outer cylinder 2b is disposed so as to cover the inner cylinder 2a, and the inner circumference (inner surface) of the outer cylinder 2b is substantially the same as the outer circumference (outer surface) of the inner cylinder 2a over the entire circumference except the portion where the runner 2d is formed. In contact. On the cross section shown in FIG. 3, the outer cylinder 2b has a thick portion formed in a portion including the runner 2d, and the thickness of the thickest portion is Lb1. Further, the thickness of the opposite side of the runner 2d (the portion moved 180 ° on the circumference of the cross section of the outer cylinder 2b shown in FIG. 3) is the thinnest at Lb2.

  In the present specification, the thickness Lb1 of the thickest portion of the outer cylinder 2b means a dimension including a gap portion due to the runner 2d.

  Since the outer cylinder 2b having the thick part having the thickness Lb1 has the thick part only in a part in the circumferential direction, the outer cylinder 2b having the thick part having the uniform thickness Lb1 over the entire circumferential direction is provided. The sinterability is better than that of the cylinder. Further, with such a configuration, the outer cylinder 2b is damaged even if a pressing force is generated due to a solidified metal melt 3 that has entered the gap between the inner cylinder 2a and the outer cylinder 2b from the runner 2d. Can be suppressed.

  Moreover, since the outer cylinder 2b is smaller than the outer cylinder having a thick portion having a uniform thickness Lb1 in the entire circumferential direction, the main cylinder 2 and the injection pump can be reduced in size and cost. enable.

  The thickness Lb1 of the thick part is preferably 30 mm or greater and 40 mm or less. This is because if the thickness Lb1 is less than 30 mm, the strength may not be sufficient, and if it exceeds 40 mm, the sinterability may be insufficient.

  The depth D of the groove (concave portion) on the inner surface of the outer cylinder 2b constituting the rising portion of the runner 2d is preferably 7 mm to 11 mm, and the preferable thickness of the solid portion contributing to the strength is 23 mm or more and 29 mm. It becomes as follows.

  The thickness Lb2 of the thinnest part of the outer cylinder 2b is preferably 10 mm or more. This is because the strength may be insufficient if the thickness Lb2 is less than 10 mm.

  More preferably, the difference between the thickness Lb1 and the thickness Lb2 is 18 mm or more and 30 mm or less.

As shown in FIG. 2, in the first embodiment, the center axis (center of the outer periphery) C _2a of the inner cylinder _2a is shifted (eccentric) from the center axis C _2b of the outer cylinder 2b, so that the outer cylinder 2b A thick part has occurred. Direction deviation (eccentricity) is the positive direction of the X axis in FIG. 2 and FIG. 3, the opposite side of the runner 2d across a center axis C _2b of the outer cylinder 2b.

The preferable range of the amount of deviation (eccentricity) of the central axis C _2a from the central axis C _2b is 3 mm or more and 15 mm or less, whereby the thickness Lb1 and the thickness Lb2 of the outer cylinder 2b are respectively the above preferable values. Within range. By eccentric from the central axis C _2b of the central axis C _2a of the thus inner tube 2a outer cylinder 2b, in the first embodiment, in cross-section of the inner cylinder 2a and the outer tube 2b, and inner and outer peripheries of the conventional Since the thick portion can be provided in the same circular shape, there is an advantage that the main cylinder 2 and other parts of the hot chamber die casting machine 1 such as the holding cylinder 6 can be easily manufactured.

  The inner cylinder 2a and the outer cylinder 2b can be manufactured using a sintered body such as titanium boride, zirconium boride, silicon carbide, silicon nitride, sialon, and in particular, strength (heat resistance) at high temperatures and From the viewpoint of high thermal conductivity, it is preferable to use a silicon nitride sintered body or a sialon sintered body. Further, the inner cylinder 2a and the outer cylinder 2b are preferably made of a sintered body made of the same material so as to prevent thermal stress from being generated due to a difference in thermal expansion coefficient when the main cylinder 2 is heated or lowered. Made.

  A through-hole 14 and a hole constituting the first horizontal portion of the runner 2d are drilled in the sintered body serving as the inner cylinder 2a by a laser processing method. A hole constituting the second horizontal portion of the runner 2d is also drilled in the sintered body to be the outer cylinder 2b by a laser processing method, and a groove (concave portion) constituting the rising portion of the runner 2d in FIG. To cut. Note that these holes and grooves may be formed by processing a green body (green compact) before sintering.

Below, the detail of the part of hot chamber die-casting machines 1 other than an injection pump is demonstrated.
The holding cylinder 6 that holds the main cylinder 2 is supported by inserting an upper portion of the holding cylinder 6 into the flange 10, and the flange 10 protrudes from an intermediate portion of the structure 22 that holds the hydraulic cylinder 21 disposed above the flange 10. The supporting part 9 is fixed together with the presser plate 24 with bolts 23.

  The holding cylinder 6 has a cylinder upper part 6 a into which the main cylinder 2 is inserted, and a step part 6 b having an inner diameter smaller than the outer diameter of the main cylinder 2. By using the main cylinder holding bolt 26 and the terminal 27, the main cylinder 2 is pressed against the step portion 6b of the holding cylinder 6 to prevent the main cylinder 2 from moving up and down when the plunger 11 moves up and down. ing. Further, anti-rotation means such as pins and keys (not shown) are provided between the main cylinder 2 and the holding cylinder 6 to prevent mutual rotation.

  The nozzle 5 passes through the nozzle insertion hole 17 provided on the side surface of the holding cylinder 6 in accordance with the outlet of the runner 2d of the main cylinder 2, and has a ring shape on the conical joint end face provided at the outlet of the runner 2d. The outflow end of the nozzle 5 joined through the seal 18 and connected to the mold 4 is heated by a nozzle heater 19 so that the temperature of the molten metal 3 passing through the inside does not become lower than a desired temperature. In addition, a cotton-like ceramic weir 20 is disposed for the purpose of sealing so that the molten metal 3 does not leak from around the nozzle 5 protruding from the molten metal tank 7.

  The hydraulic cylinder 21 is connected to the plunger 11 via a coupling 25 so as to transmit an acting force to the plunger 11 of the injection pump.

<Embodiment 2>
FIG. 4 is a sectional view showing a transverse section of a main cylinder 2 ′ for an injection pump according to Embodiment 2 of the present invention. Unlike the inner cylinder 2a and the outer cylinder 2b shown in the first embodiment, the inner cylinder 2a ′ and the outer cylinder 2b ′ of the main cylinder 2 ′ have an elliptical cross-sectional shape.

  The outer cylinder 2b ′ is formed with a thick portion having a thickness Lb3 of each of the two major diameter portions in the elliptical cross section, and one of the thick portions (the left side in FIG. The runway 2d 'is provided on the inner surface of the direction)).

  In addition, the inner cylinder 2a 'is formed with a thick portion having a thickness La3 at each of the two major diameter portions in the elliptical cross section.

  In the second embodiment, a thick portion having a thickness Lb3 can be formed in a portion including the runner 2d 'without shifting (centering) the central axis of the inner cylinder 2a' and the central axis of the outer cylinder 2b '. Since the main cylinder 2 'has an axisymmetric shape around the central axes of the inner cylinder 2a' and the outer cylinder 2b ', there is little distortion that occurs when the temperature rises and falls, and the plunger 11 even when used repeatedly. There is an advantage that can be inserted smoothly.

  In addition, since one of the thick portions of the inner cylinder 2a ′ having the thickness La3 is a part in contact with the runner 2d ′, the strength of this part is improved, and the inner cylinder 2a ′ and the outer cylinder are improved from the runner 2d ′. The risk of damage to the inner cylinder 2a ′ due to the pressing force caused by the solidified product of the molten metal 3 entering the gap with the 2b ′ can be further reduced.

  The thickness Lb3 on the major axis side of the outer cylinder 2b 'is preferably 30 mm or greater and 40 mm or less. If the thickness Lb3 is less than 30 mm, the strength is insufficient, and there are cases where it is damaged due to the pressing force caused by the solidified metal melt 3 entering the gap between the inner cylinder 2a ′ and the outer cylinder 2b ′. This is because the sinterability may deteriorate.

  On the other hand, the thickness Lb4 on the short diameter side of the outer cylinder 2b 'is preferably 20 mm or more in order to ensure the strength.

  The thickness La3 on the long diameter side of the inner cylinder 2a 'is preferably 14 mm or more and 18 mm or less. If the thickness La3 is less than 14 mm, the strength may be insufficient, and there is a possibility of breakage due to the pressing force caused by the solidified metal melt 3 entering the gap between the inner cylinder 2a ′ and the outer cylinder 2b ′. It is. Further, if the thickness La3 on the long diameter side exceeds 18 mm, it is preferable because the strength can be surely ensured, but the main cylinder 2 'becomes large, which is not preferable in terms of downsizing and cost reduction of the injection pump.

  On the other hand, the thickness La4 on the short diameter side of the inner cylinder 2a 'is preferably 10 mm or more in order to ensure the strength.

  The depth D 'of the concave portion on the inner surface of the outer cylinder 2b constituting the rising portion of the runner 2d' is preferably 7 mm or greater and 11 mm or less. Thereby, the thickness of the solid part of the thick part having the runner 2d 'of the outer cylinder 2b' is preferably 23 mm or more.

  As a modification of the second embodiment, in the cross section shown in FIG. 4, the outer circumference of the outer cylinder 2b ′ remains elliptical, and the inner circumference and outer circumference of the inner cylinder 2a ′ and the inner circumference of the outer cylinder 2b ′ are made circular. May be. Also in the modification of the second embodiment, the outer cylinder 2b 'has a thick portion at the runner 2d' and the main cylinder 2 'has an axisymmetric shape. And since the cross-sectional shape of the inner periphery of inner cylinder 2a 'becomes circular, it has the advantage that the plunger 11 which has the same circular cross section as Embodiment 1 can be used.

<Embodiment 3>
5 (a) and 5 (b) are views showing a longitudinal section of a hot chamber die casting machine 1 ′ according to Embodiment 3 of the present invention, FIG. 5 (a) is a front view, and FIG. 5 (b) is FIG. The Vb-Vb longitudinal cross-section of a) is shown. FIG. 6 is an enlarged view of a portion B in FIG. FIG. 7 is a sectional view showing a VII-VII transverse section of FIG. The description of the cylindrical portion 6a of the holding cylinder 6 is omitted.

  The third embodiment is different from the first and second embodiments in which the rising portion of the runner 2d ″ is formed inside the outer cylinder 2b ″ and the rising portion of the runner 2d is on the surface of the inner surface of the outer cylinder 2b. .

  Since the rising portion of the runner 2d ″ is located inside the outer cylinder 2b ″, the molten metal 3 does not enter the gap between the inner cylinder 2a and the outer cylinder 2b ″ from the rising portion. The portion where 3 enters between the inner cylinder 2a and the outer cylinder 2b ″ is only the first and second horizontal portions of the runner 2d ″, and the amount of the molten metal 3 that enters the gap and solidifies can be reduced. Thus, the pressing force generated due to the solidified product of the solidified molten metal 3 can be reduced, and the outer cylinder 2b ″ can be further prevented from being damaged.

  Further, as described above, since it is estimated that stress concentration can occur at the rising portion of the runner 2d ″ when a pressing force is generated, the stress concentration portion may be eliminated or the outer cylinder 2b ″ may be damaged. It is thought to contribute further to the suppression.

  The thickness Lb1 ′ of the thick wall portion where the runner 2d ″ is formed is preferably 30 mm or more and 40 mm or less. If the thickness Lb1 ′ is less than 30 mm, the strength may not be sufficient. This is because the ligation may be deteriorated.

  The diameter D1 of the rising portion of 2d ″ in the cross section shown in FIG. 7 is preferably 10 mm or more and 14 mm or less. Further, the runner 2d ″ (rising portion) and the inner surface of the outer cylinder 2b ″ in this cross section The distance Ld is preferably 10 mm or more. If the distance Ld is less than 10 mm, the pressing force generated due to the solidified metal melt 3 entering the gap between the inner cylinder 2a and the outer cylinder 2b " This is because the outer cylinder 2b ″ may be damaged between the inner surface and the runner 2d ′.

  It should be noted that the end of the rising portion of the runner 2d ″ inside the outer cylinder 2b ″ shown in the third embodiment is abutted inside the outer cylinder 2b ″ and changed its direction to a right angle, thereby exiting the runner 2d ″. However, such a rising portion first pierces a through-hole that penetrates the thick portion of the outer cylinder 2b ″ in the Z-axis direction, and then the end portion of the outer cylinder 2b ″. It is possible to manufacture easily and inexpensively by forming the abutting portion by filling it with the same material or a material having a similar thermal expansion coefficient.

  Further, in the third embodiment shown in FIG. 5, the rising portion of the runner 2d ″ extends in a substantially vertical direction, but may be formed obliquely so as to have an angle with respect to the Z axis. In the third embodiment, the first and second horizontal portions of the runner 2d ″ extend in a substantially horizontal direction (parallel to the X axis), but obliquely (so as to have an angle with respect to the X axis). You may form so that it may extend.

  Moreover, although the cross-sectional shape of the rising part of the runners 2d, 2d ′, 2d ″ shown in the first to third embodiments is circular or semicircular, it is not limited to these shapes, and is a triangle or a quadrangle. Any shape including a polygon including an ellipse or an ellipse may be used.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-section of the hot chamber die-casting machine concerning Embodiment 1 of this invention is shown, (a) is sectional drawing seen from the front, (b) is IIb-IIb sectional drawing of (a). It is an enlarged view of the A section of Fig.1 (a). It is sectional drawing which shows the III-III cross section of FIG. It is sectional drawing which shows the cross section of the main cylinder concerning Embodiment 2 of this invention. The longitudinal cross-section of the hot chamber die-casting machine concerning Embodiment 3 of this invention is shown, (a) is sectional drawing seen from the front, (b) is Vb-Vb sectional drawing of (a). It is an enlarged view of the B section of Drawing 5 (a). It is sectional drawing which shows the VII-VII cross section of FIG. The longitudinal cross section of the conventional hot chamber die-casting machine is shown, (a) is sectional drawing seen from the front, (b) is Ib-Ib sectional drawing of (a).

Explanation of symbols

  1, 1 ', 40 Hot chamber die casting machine, 2, 2', 2 ", 42 Main cylinder, 2a, 2a ', 42a Inner cylinder, 2b, 2b', 2b", 42b Outer cylinder, 2c, 42c Bottom plate, 2d , 2d ′, 2d ″, 42d runner, 3,43 molten metal, 4,44 mold, 5,45 nozzle, 6,46 holding cylinder, 6a, 46a cylindrical part, 6b, 46b stepped part, 7, 47 Molten bath, 8,48 furnace body, 9,49 support part, 10,50 flange, 11,51 plunger, 12,52 heater, 13,53 communication hole, 14,54 through hole, 15,55 sprue bush, 16, 56 Runner part, 17, 57 Nozzle insertion hole, 18, 58 Ring seal, 19, 59 Nozzle heater, 20, 60 Cotton-like ceramic weir, 21, 61 Hydraulic cylinder, 22, 62 Holding structure Body, 23 and 63 volts, 24, 64 pressing plate, 25,65 couplings, 26, 66 main cylinder holding bolts, 27,67 terminal

Claims (5)

  A main cylinder in an injection pump of a hot chamber die casting machine comprising an inner cylinder into which a plunger is inserted and an outer cylinder surrounding the inner cylinder, and having a runner for injecting molten metal into a mold, The main cylinder for an injection pump, wherein the outer cylinder has a thick part thick when viewed in cross section, and the runner is provided in the thick part.   A main cylinder in an injection pump of a hot chamber die casting machine comprising an inner cylinder into which a plunger is inserted and an outer cylinder surrounding the inner cylinder, and having a runner for injecting molten metal into a mold, A main cylinder for an injection pump, wherein a central axis of the inner cylinder is deviated from a central axis of the outer cylinder, and the runner is provided on the opposite side to the direction in which the inner cylinder is displaced.   A main cylinder in an injection pump of a hot chamber die casting machine comprising an inner cylinder into which a plunger is inserted and an outer cylinder surrounding the inner cylinder, and having a runner for injecting molten metal into a mold, An injection characterized in that the inner cylinder and the outer cylinder have an elliptical cross-sectional shape, and the runner is provided in a thick portion on the long diameter side when viewed in the cross-section of the outer cylinder. Main cylinder for pump.   The main cylinder for an injection pump according to any one of claims 1 to 3, wherein a rising portion of the runner is provided inside the outer cylinder.   A hot chamber die casting machine, wherein the main cylinder for an injection pump according to any one of claims 1 to 4 is used as an injection pump.

Images