JP5625359B2 - Die casting machine injection plunger structure and injection method - Google Patents

Description

  The present invention relates to a technique of an injection plunger structure and an injection method of a die casting machine that injects molten metal into a cavity of a mold.

  2. Description of the Related Art Conventionally, a technique of a die casting machine as a die casting facility for press-fusing molten metal into a die by a die casting machine is known. The die casting machine has an injection plunger structure in which a plunger tip is pressed by a plunger rod and the plunger tip is advanced in a plunger sleeve to inject molten metal into a mold cavity. For example, Patent Document 1 discloses an injection plunger structure of a die casting machine.

  Since the outer periphery of the plunger tip is a sliding portion with the plunger sleeve, it is worn by use. However, since the plunger tip is always fitted to the plunger sleeve, it is difficult to control the dimensions of the outer periphery of the plunger tip. In addition, the plunger tip can be changed by stopping the die casting machine, removing the mold from the die casting machine, detaching the plunger tip with a tool and performing the injection forward and backward operation, attaching the die to the die casting machine, and restarting the die casting machine. Is necessary and is not an easy task. Therefore, the wear on the outer periphery of the plunger tip is often recognized only after an abnormality such as a burr insertion occurs, and it is difficult to always use the outer peripheral plunger tip within the dimensional tolerance.

  Further, a lubricant is required between the outer periphery of the plunger tip and the inner periphery of the plunger sleeve. However, since the plunger tip is always fitted to the plunger sleeve, a groove is provided in the inner periphery of the plunger sleeve on the reverse stroke end side of the plunger tip, and the lubricant is dropped from the upper portion of the plunger sleeve. With such means, the application of the lubricant is indefinite, the appropriate amount of lubricant cannot be managed, and the reliable application of the lubricant in the circumferential direction of the plunger tip cannot be guaranteed.

Japanese Utility Model Publication No. 6-29757

  The problem to be solved is to provide an injection plunger structure and injection method for a die casting machine that can always use an outer peripheral plunger tip within dimensional tolerances and apply an appropriate amount of lubricant to the outer periphery of the plunger tip.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in Claim 1, it comprises a plunger sleeve to which molten metal is supplied, a plunger tip that slides inside the plunger sleeve, and a plunger rod that abuts the plunger tip without mechanical connection, recess is formed in the contact surface of the plunger rod in the plunger tip, the diameter of the recess is larger than the diameter of the contact-side end of the plunger tip in the plunger rod, the plunger rod, the machine into the recess It makes contact without any special connection .

The injection of a die casting machine according to claim 2, comprising: a plunger sleeve to which molten metal is supplied; a plunger tip that slides within the plunger sleeve; and a plunger rod that abuts the plunger tip without mechanical connection. A die casting machine injection method for injecting molten metal into a mold cavity using a plunger structure, wherein a concave portion is formed on a contact surface of a plunger rod in the plunger tip, and the diameter of the concave portion is The plunger rod is larger than the diameter of the end of the plunger rod in contact with the plunger tip, the plunger rod is brought into contact with the recess without mechanical connection , and the plunger tip is pressed by the plunger rod. The tip is advanced and melted in the plunger sleeve The metal is injected into the cavity of the mold, and after the injection is completed, the mold is opened. On the limit side, the recovered plunger tip is loaded.

  In claim 3, after the plunger tip is collected at the injection advance limit side in the plunger sleeve, the collected plunger tip is judged to be good or bad. It is to be loaded on the rearward limit side in the sleeve.

  According to a fourth aspect of the present invention, after the plunger tip is collected on the injection advance limit side in the plunger sleeve, a lubricant is applied to the outer periphery of the collected plunger tip.

  According to the injection plunger structure and the injection method of the die casting machine of the present invention, the outer peripheral plunger tip within the dimensional tolerance can always be used, and an appropriate amount of lubricant can be applied to the outer periphery of the plunger tip.

The schematic diagram which showed the structure of the plunger structure of the die-casting machine concerning embodiment of this invention. The side view and back view showing the contact of a plunger tip and a plunger rod similarly. The flowchart which showed the injection | emission process of the die-casting machine concerning embodiment of this invention. The schematic diagram which showed the structure of a part of injection process similarly. The schematic diagram which showed the structure of a part of plunger tip exchange process similarly. The schematic diagram which showed the structure of a part of plunger tip exchange process similarly.

Next, embodiments of the invention will be described.
FIG. 1 is a schematic view showing the structure of a plunger structure of a die casting machine according to an embodiment of the present invention, FIG. 2 is a side view and a rear view showing the contact between the plunger tip and the plunger rod, and FIG. It is the flowchart which showed the injection | emission process of the die-casting machine concerning embodiment. 4 is a schematic diagram showing a part of the configuration of the injection process, FIG. 5 is a schematic diagram of a part of the plunger tip replacement process, and FIG. 6 is a part of the configuration of the plunger tip replacement process. It is the shown schematic diagram.

The plunger structure 5 of the die casting machine 100 which is embodiment of this invention is demonstrated using FIG. 1 and 4 to 6, the plunger tip 20 slides in the plunger sleeve 30 in the direction of the arrow A, and the direction indicated by the arrow A is the front side and the reverse direction is the rear side.
The die casting machine 100 includes a movable mold 3, a fixed mold 4, a plunger structure 5, a runner 6, and a cavity 7, and is made of molten aluminum or the like (hereinafter referred to as molten metal Y). This is a mold casting facility for press-fitting into a cavity 7 formed by the movable mold 3 and the fixed mold 4.

  The cavity 7 is formed between the fixed mold 4 fixed to the die casting machine 100 and the movable mold 3 that moves in a direction approaching or separating from the fixed mold 4, and is a space that forms a product shape. is there. The stationary mold 4 has a plunger structure 5.

  The plunger structure 5 includes a plunger rod 10, a plunger tip 20, and a plunger sleeve 30. By pressing the cylindrical plunger tip 20 with the rod-like plunger rod 10, the plunger tip 20 is hollow. The plunger sleeve 30 is advanced to inject the molten metal Y into the cavity 7.

  On the upper surface of the plunger sleeve 30, a hot water supply port 35 for supplying the molten metal Y into the plunger sleeve 30 from the stationary mold 4 toward the rear side in the sliding direction of the plunger sleeve 20, and the plunger tip 20 in the plunger sleeve 30. And a loading port 36 for loading.

  The plunger tip 20 advances in the plunger sleeve 30 from the post-injection advance limit 30B to the injection advance limit 30A. The “injection advance limit 30A” is a front end position of the front surface of the plunger tip 20 when the plunger tip 20 slides in the plunger sleeve 30, and indicates a position where the plunger tip 20 cannot advance further. Further, the “reverse injection limit 30 </ b> B” is a front end position of the front surface of the plunger tip 20 when the plunger tip 20 slides in the plunger sleeve 30, and indicates a position where the plunger tip 20 cannot move backward any further. In the present embodiment, the position of the backward injection limit 30B and the front end position of the loading port 36 are the same position.

The contact of the plunger rod 10 and the plunger tip 20 according to the embodiment of the present invention will be described with reference to FIG. 2A shows a side view of the plunger tip 20 and FIG. 2B shows a rear view of the plunger tip 20.
A feature of the plunger structure 5 of the present invention is that the plunger rod 10 and the plunger tip 20 are in contact with each other without mechanical connection. “Mechanical connection” means that the connection is made by a screw or the like, and that the operator can release the connection using a tool. That is, in the plunger structure 5 of the present invention, the plunger rod 10 and the plunger tip 20 include all that can be disconnected by the operator without using a tool.

  The central portion of the rear surface pressed by the plunger rod 10 of the plunger tip 20 of the present embodiment is concave in the radial sectional view of the plunger tip 20 and in the sectional view of the plunger tip 20 in the sliding direction. A recess 20A formed in a circular shape is provided. On the other hand, the plunger rod 10 has a tip portion 10A formed in a substantially hemispherical shape. In the sectional view of the plunger tip 20 in the sliding direction, the diameter of the recess 20 </ b> A is sufficiently larger than the diameter of the tip portion 10 </ b> A of the plunger rod 10.

  The plunger rod 10 presses the plunger tip 20 only by the configuration in which the distal end portion 10A of the plunger rod 10 abuts a part of the concave portion 20A of the plunger tip 20. Therefore, the plunger rod 10 can move the plunger tip 20 forward, but the plunger rod 10 cannot move the plunger tip 20 backward. That is, the plunger tip 20 is pushed forward by moving the plunger rod 10 forward, but when the plunger rod 10 is moved backward, the tip of the plunger rod 10 comes out of the recess 20A of the plunger tip 20, The plunger rod 10 and the plunger tip 20 are separated from each other, and the plunger tip 20 remains in place.

  In the plunger structure 5, the diameter of the recess 20 </ b> A is sufficiently larger than the diameter of the plunger rod 10 in a sectional view of the plunger tip 20 in the sliding direction. Without matching, the distal end portion 10A of the plunger rod 10 is configured to only abut against a part of the concave portion 20A of the plunger tip 20. That is, when the plunger rod 10 makes the distal end portion 10A contact the concave portion 20A of the plunger tip 20, or when the plunger rod 10 makes the distal end portion 10A contact and press the concave portion 20A of the plunger tip 20, the distal end portion 10A. The plunger rod 10 can press the plunger tip 20 even when the abutting position of is deviated in the recess 20A.

  With this configuration, when the plunger tip 20 is pressed by the plunger rod 10, it is necessary to press the plunger rod 10 along the center of the plunger tip 20, that is, the central axis in the sliding direction of the plunger sleeve 30. There is no. In other words, the plunger tip 20 can be pressed in the plunger sleeve 30 even when the portion of the recess 20 </ b> A that is offset from the center of the plunger tip 20 is pressed by the tip portion 10 </ b> A of the plunger rod 10. Even when the pressing direction of the plunger rod 10 deviates from the central axis in the sliding direction of the plunger sleeve 30, the plunger tip 20 can be pressed in the plunger sleeve 30.

The injection process S100 of the die casting machine 100 which is the embodiment of the present invention will be described with reference to FIG.
The die casting machine injection step S100 is a step in which the molten metal Y is press-fitted into the cavity 7 formed by the movable mold 3 and the fixed mold 4 by using the above-described die casting machine 100.

  The injection step S100 includes a pouring step S110, an injection advance step S120, a movable mold opening step S130, and a plunger tip replacement step S200. The pouring step S110, the injection advancement step S120, and the movable mold opening step S130 are existing steps, and the plunger tip replacement step S200 is a step that is a feature of the present invention.

  The plunger tip replacement step S200 includes a plunger tip ejection step S210, a plunger tip recovery step S220, a plunger tip size confirmation step S230, a plunger tip discharge and replenishment step S240, a lubricant application step S250, and a plunger tip supply step S260. And a plunger tip loading step 270. Hereinafter, each step will be described.

The pouring process S110, the injection advance process S120, and the movable mold opening process S130 will be described with reference to FIG.
The pouring step S110 is a step of supplying the molten metal Y to the hot water supply port 35 of the plunger sleeve 30. The molten metal Y supplied from the hot water supply port 35 stays in a space formed between the movable mold 3 and the plunger tip 20 in the plunger sleeve 30. At this time, the plunger tip 20 is positioned behind the hot water supply port 35.

  The injection advancement step S120 is a step of pushing the plunger tip 20 by the plunger rod 10 in the plunger sleeve 30 to advance the plunger tip 20. The molten metal Y is injected into the cavity 7 by moving the plunger tip 20 forward. At this time, the plunger rod 10 presses the plunger tip 20 only by the configuration in which the distal end portion 10A of the plunger rod 10 is in contact with a part of the concave portion 20A of the plunger tip 20.

  The movable mold opening step S130 is a step of opening the movable mold 3 and opening the cavity 7 after the molten metal Y is solidified in the cavity 7 to become a casting Y ′. At this time, the casting Y ′ is held by the movable mold 3 and is separated from the fixed mold 4 and the plunger structure 5.

The plunger tip protruding step S210, the plunger tip collecting step S220, and the plunger tip dimension checking step S230 will be described with reference to FIG.
The plunger tip protruding step S <b> 210 is a step of taking out the casting Y ′ from the movable mold 3 with the cavity 7 opened, and protruding the plunger tip 20 in the forward direction in the plunger structure 5. At this time, the plunger tip 20 is pressed by the plunger rod 10 and protrudes in the plunger sleeve 30 to the injection advance limit 30A.

  The plunger tip recovery step S220 is a step of recovering the plunger tip 20 from the plunger structure 5 by the operator. At this time, since the plunger tip 20 and the plunger rod 10 are in contact with each other without mechanical connection, the operator simply pulls out the plunger tip 20 protruding to the injection advance limit 30A in the forward direction without using a tool or the like. Thus, the plunger tip 20 can be easily detached from the plunger rod 10. Further, the plunger tip 20 can be detached from the plunger rod 10 even in a configuration in which the same operation is automatically performed by the apparatus.

  The plunger tip size confirmation step S230 is a step of confirming the dimensions of the plunger tip 20 that has slid in the plunger sleeve 30 and injected the molten metal Y, that is, the plunger tip 20 collected in the plunger tip collection step S220. Here, confirming the dimensions of the plunger tip 20 means confirming whether the outer peripheral length or outer diameter of the plunger tip 20 is within the dimensional tolerance, that is, determining whether the recovered plunger tip 20 is good or bad. is there. In the present embodiment, the laser measuring device 70 checks whether the outer diameter of the plunger tip 20 is within a dimensional tolerance.

The plunger tip discharging and replenishing step S240, the lubricant applying step S250, the plunger tip supplying step S260, and the plunger tip loading step S270 will be described with reference to FIG.
In the plunger tip discharge and replenishment step S240, if the outer diameter of the plunger tip 20 is within the dimensional tolerance in the plunger tip size confirmation step S230, that is, if the collected plunger tip 20 is a non-defective product, the plunger tip 20 is used again. This is a step of storing in the first storage unit 51 provided inside the die casting machine 100 or outside the die casting machine 100. In the plunger tip discharging and replenishing step S240, if the outer diameter of the plunger tip 20 is not within the dimensional tolerance in the plunger tip size checking step S230, the plunger tip 20 is discharged as a defective product from the injection step S100, and a new plunger This is a step of supplying the chip 20 to the first storage unit 51.

  The lubricant application step S250 is a step of applying the lubricant to the outer periphery of the plunger tip 20 within the dimensional tolerance stored in the first storage unit 51 or the new plunger tip 20 in the plunger tip discharge and replenishment step S240. is there. In the lubricant application step S250 of the present embodiment, the lubricant is applied to the outer periphery of the plunger tip 20 by the operator, and the excess lubricant is removed. Moreover, the structure which apply | coats a lubrication agent automatically with an apparatus and removes excess lubricant automatically may be sufficient. The plunger chip 20 to which the lubricant is applied in the lubricant application step S250 is stored in the second storage unit 52 provided in the die casting machine 100 or outside the die casting machine 100.

  The plunger tip supply step S260 is a step of supplying the plunger tip 20 applied with an appropriate amount of lubricant in the lubricant application step S250 and stored in the second storage unit 52 to the post-injection advance limit 30B. At this time, a plurality of plunger chips 20 that have undergone the plunger chip size confirmation process S230 to the lubricant application process S250 may be stored in the second storage unit 52 and sequentially inserted into the plunger chip supply process S260. .

  The plunger tip loading step S270 is a step of bringing the plunger rod 10 into contact with the plunger tip 20 supplied in the plunger tip supply step S260 without mechanical connection. That is, in the plunger tip loading step S270, the plunger rod 10 is brought into contact with the concave portion 20A of the plunger tip 20 supplied to the backward injection limit 30B in the plunger tip supply step S260. If plunger tip loading process S270 is complete | finished, it will return to pouring process S110 again and will prepare for the next injection process.

  In addition, about the plunger chip | tip replacement | exchange process S200 from the plunger chip | tip protrusion process S210 to the plunger chip | tip loading process 270, it is good also as a structure which performs the operation | work demonstrated that an operator performs with a machine and automates all processes.

By adopting such a configuration, the following effects can be obtained.
That is, according to the present embodiment, for each shot (injection step S100), whether or not the outer periphery of the plunger tip 20 is within the dimensional tolerance is confirmed in the plunger tip size confirmation step S230, and the outer periphery of the plunger tip 20 is within the dimensional tolerance. Otherwise, since the plunger tip 20 is replaced with a new one in the plunger tip discharge and replenishment step S240, the outer peripheral plunger tip 20 within the dimensional tolerance can be used at all times.

  Further, according to the present embodiment, every shot (injection step S100), the lubricant is applied to the outer periphery of the plunger tip 20 in the lubricant application step S250, and the excess lubricant is removed, so that an appropriate amount is always provided. The lubricant can be applied to the outer periphery of the plunger tip 20. Therefore, it is possible to reliably prevent the sliding failure of the plunger tip 20 due to insufficient lubricant (seizure, galling, etc.) or the adverse effect on casting quality due to excessive lubricant.

  Further, since the plunger tip 20 and the plunger rod 10 are in contact with each other without mechanical connection, even when the plunger sleeve 30 is thermally deformed so as to be concavely curved in the sliding direction, the plunger tip 20 is moved to the plunger. The sleeve 30 can be slid following the deformation of the sleeve 30. Therefore, it is possible to suppress galling and it is not necessary to provide a special plunger tip floating mechanism, so that a plunger structure can be realized with a simple structure. The term “galling” indicates a state where the plunger tip 20 and the plunger rod 10 are fixed.

DESCRIPTION OF SYMBOLS 10 Plunger rod 10A Tip part 20 Plunger tip 20A Recessed part 30 Plunger sleeve S220 Plunger chip collection process S270 Plunger chip loading process

Claims (4)

A plunger sleeve fed with molten metal;
A plunger tip sliding in the plunger sleeve;
A plunger rod that abuts the plunger tip without mechanical connection;
Comprising
A concave portion is formed on the contact surface of the plunger rod in the plunger tip,
The diameter of the recess is larger than the diameter of the end of the plunger rod in contact with the plunger tip,
The plunger rod abuts the recess without mechanical connection ;
Die casting machine injection plunger structure. A plunger sleeve fed with molten metal;
A plunger tip sliding in the plunger sleeve;
A plunger rod that abuts the plunger tip without mechanical connection;
Injecting molten metal into a mold cavity using an injection plunger structure of a die casting machine comprising:
An injection method of a die casting machine,
A concave portion is formed on the contact surface of the plunger rod in the plunger tip,
The diameter of the recess is larger than the diameter of the end of the plunger rod in contact with the plunger tip,
The plunger rod is brought into contact with the recess without mechanical connection ,
Pressing the plunger tip with the plunger rod to advance the plunger tip in the plunger sleeve and injecting molten metal into the mold cavity;
After the injection is completed, open the mold,
At the injection advance limit side in the plunger sleeve, collect the plunger tip,
The recovered plunger tip is loaded on the post-injection advance side in the plunger sleeve.
Die casting machine injection method. After collecting the plunger tip at the injection advance limit side in the plunger sleeve, perform a pass / fail judgment of the collected plunger tip,
If the recovered plunger tip is a non-defective product, the plunger tip is loaded on the rearward limit side in the plunger sleeve.
The injection method of the die-casting machine according to claim 2. After collecting the plunger tip on the injection advance limit side in the plunger sleeve, apply a lubricant to the outer periphery of the collected plunger tip;
The injection method of the die-casting machine according to claim 2.

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