JP2007203354A - Rotating type squeeze pin ascending/descending system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating type squeeze pin ascending/descending system with which service life of a die can be extended. <P>SOLUTION: The rotating type squeeze pin ascending/descending system has the following constitution, with which in the high pressure casting, aluminum as a raw material of a cast product is poured into the die and when the cast product is under state of semi-melting, this product is pressed by descending a squeeze pin and also, the cast surface is cut down, and a friction resistance is lowered by introducing an axial rotation mechanism when ascending/descending the squeeze pin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary squeeze pin lifting / lowering system that can extend the mold life of a mold.

  In high-pressure casting, after casting, the squeeze pin is lowered to the gate in a semi-molten state to apply pressure to each part of the casting and cut the remaining solidified portion of the gate. After cutting, when the squeeze pin is pulled out (ascended), the cylindrical hole at the center of the cast product is solidified, so that a large frictional resistance is generated and a large stress is applied to the upper and lower molds. Since this operation occurs every casting, stress is repeatedly applied to the mold. In order to extend the mold life of the mold, it is desired to reduce the frictional resistance when raising and lowering the squeeze pin as much as possible.

As described in Patent Document 1, in a die-casting machine, an invention of a squeeze pin control system in a die-casting machine that accurately controls a moving stroke of a squeeze pin that locally pressurizes molten metal filled in a mold cavity Is also open to the public.
JP 09-225619 A

  However, the invention described in Patent Document 1 only accurately controls the movement stroke of the squeeze pin and does not extend the mold life of the mold.

  Then, this invention aims at providing the rotary squeeze pin raising / lowering system which can prolong the mold | die lifetime of a metal mold | die.

  In order to solve the above-described problems, the present invention provides a method for pouring aluminum 1e, which is a raw material of a cast product 1d, into dies 1b and 1c in high-pressure casting, and when the cast product 1d is in a semi-molten state, a squeeze pin. The rotary squeeze pin lifting / lowering system is characterized in that the frictional resistance 9h is lowered by introducing a shaft rotating mechanism when the squeeze pin 1a is moved up and down by lowering and pressurizing 1a and cutting the casting surface. It was.

  In order to investigate the frictional resistance stress when raising and lowering the squeeze pin in the laboratory, the result that the frictional resistance was reduced by about half was obtained by incorporating a rotating mechanism when raising and lowering the tensile tester. By adopting this for an actual operation squeeze pin, the frictional resistance during elevation is halved, so the stress burden on the mold is reduced and the life of the mold can be extended.

  The object of the present invention is to extend the mold life of the mold by pouring aluminum, which is a raw material of the cast product, into the mold in high pressure casting, and lowering the squeeze pin when the cast product is in a semi-molten state. This was realized by a rotary squeeze pin raising / lowering system characterized by reducing frictional resistance by introducing a shaft rotation mechanism when pressurizing and cutting the cast surface and raising and lowering the squeeze pin.

  Below, based on an accompanying drawing, the rotary squeeze pin raising / lowering system which is this invention is demonstrated in detail. FIG. 1 is a cross-sectional view showing a squeeze pin raising / lowering mechanism 1 during high-pressure casting in which a rotary squeeze pin raising / lowering method according to the present invention is introduced.

  The squeeze pin raising / lowering mechanism 1 at the time of high-pressure casting introduces a shaft rotation mechanism in order to reduce resistance when the squeeze pin 1a is raised / lowered.

  In high pressure casting, the upper mold 1b and the lower mold 1c are combined, and molten aluminum that is a raw material of the cast product 1d is poured into a gap between the upper mold 1b and the lower mold 1c. Aluminum is poured from the pouring direction 1e.

  After pouring aluminum, the squeeze pin 1a is lowered to the squeeze pin position 1f in the semi-molten cast product 1d, and pressure is applied to the cast product 1d. At the same time as pressing, the cast surface is cut, and then the squeeze pin 1a is raised.

  In FIGS. 2 to 15, an experiment using a tensile test apparatus 2 having an axis rotation mechanism is performed to reduce the resistance when the squeeze pin 1 a is raised and lowered by introducing the squeeze pin raising and lowering mechanism 1 during high-pressure casting. To show.

  FIG. 2 is a diagram showing the entire tensile test apparatus 2 with a shaft rotation mechanism that simulates the rotary squeeze pin lifting / lowering system according to the present invention.

  The tensile test device 2 having a shaft rotation mechanism is a device for laboratory investigation of the frictional resistance stress when raising and lowering the squeeze pin, and includes a shaft rotation frictional resistance generator 2a, a rotation speed control device 3, and a universal connector. 4, the height adjusting jack 5, the tensile test apparatus lifting / lowering unit 10, the tensile test apparatus upper frame 18, the load detector 19, and the like.

  The shaft rotation frictional resistance generator 2a will be described in detail with reference to FIGS. The rotation speed control device 3 will be described in detail with reference to FIGS. 14 and 15.

  The universal connector (universal joint) 4 is a terminal provided for connecting the shaft rotation frictional resistance generating part 2 a to the load detector 19. The pin hole 4a is for fixing the load detector 19.

  The height adjusting jack 5 is an instrument for adjusting the height of the shaft rotational frictional resistance generating portion 2a. Adjustment can be made so that the connection between the shaft rotational frictional resistance generator 2a and the rotational speed control device 3 is appropriate.

  The tensile test apparatus upper pedestal 18 is a pedestal that supports the upper portion of the shaft rotational frictional resistance generating unit 2a. The universal connector 4 is passed through the through hole and connected to a load detector 19 placed on the tensile test apparatus upper base 18.

  The load detector (load cell) 19 is connected to the universal connector 4 and detects the frictional resistance 9h caused by the up and down and rotation of the shaft rotational frictional resistance generator 2a. For the load detector 19, a strain gauge type sensor or the like is used.

  The test result detected by the load detector 19 is sent to a recorder or the like. The test result can be edited and output as a stress-strain curve or the like. The test results will be described in detail with reference to FIGS.

  FIG. 3 is a diagram showing the shaft rotation frictional resistance generating portion 2a of the tensile test apparatus 2 with a shaft rotation mechanism simulating the rotary squeeze pin lifting / lowering system according to the present invention.

  The shaft rotation frictional resistance generating part 2a includes a slide bearing part 6, a long rod 7, an insertion part 8, a frictional resistance generating part 9 and the like, and a frictional resistance 9h is provided between the long rod 7 and the frictional resistance generating part 9. Occurs.

  The slide bearing portion 6 is a place where the universal connector 4 is installed, and is provided on the upper portion of the long rod 7, and can reduce the loss of the frictional resistance 9 h in the frictional resistance generating portion 9. The slide bearing portion 6 will be described in detail with reference to FIGS.

  The long rod 7 is a rod-shaped member corresponding to the squeeze pin 1 a and can transmit the generated frictional resistance 9 h to the load detector 19. The long rod 7 will be described in detail with reference to FIG.

  The insertion portion 8 is a place where the shaft rotational frictional resistance generating portion 2a is connected to the rotational speed control device 3, and is attached to the lower portion of the long rod 7 by a fastener 7f. The insertion portion 8 will be described in detail with reference to FIG.

  The frictional resistance generating unit 9 is a member for generating a frictional resistance 9 h between the long rod 7 and is attached below the tensile test apparatus lifting unit 10. The frictional resistance generator 9 will be described in detail with reference to FIGS.

  The tensile test apparatus lifting / lowering unit (crosshead) 10 is a lifting platform that moves the frictional resistance generating unit 9 up and down in order to generate a frictional resistance 9 h between the long rod 7 and the frictional resistance generating unit 9. The long rod 7 is passed through the central through hole 10a.

  FIG. 4 is a view showing the slide bearing portion 6 of the shaft rotational frictional resistance generating portion 2a simulating the rotary squeeze pin lifting / lowering method according to the present invention.

  The slide bearing portion 6 includes a frame member 12, a shaft member 13, a U-shaped member 14, a fixed member 15, and the like. The frame member 12 will be described in detail in FIG. 5, the shaft member 13 in FIG. 6, the U-shaped member 14 in FIG. 7, and the fixing member 15 in FIG.

  The frame member 12 is a columnar member penetrating through the center, and has a bearing 6a and a runout countermeasure material 6b inside. The shaft member 13 is a rod-shaped member, and the universal connector 4 is attached to the upper end.

  From the lower side of the frame member 12, it is extended upward through the shaft member 13, and the fastener 6 c is passed from the upper side of the shaft member 13 and tightened. The shaft member 13 receives stress such as rotation from the long rod 7, but is supported by a bearing 6 a provided between the shaft member 13 and the frame member 12.

  Further, the anti-centering material 6b is inserted between the inner peripheral surface of the frame member 12 and the shaft member 13 and the long rod 7 so that stress such as rotation is accurately transmitted, and the loss of the frictional resistance 9h. Can be reduced.

  The U-shaped member 14 and the fixing member 15 are members for attaching the long rod 7 to the frame member 12, and the empty space is closed by the fixing member 15 through the long rod 7 inside the U-shaped member 14. The fixing member 15 is fastened to the U-shaped member 14 with the screw 6e, and the U-shaped member 14 is fastened to the frame member 12 with the screw 6d.

  FIG. 5 is a view showing the frame member 12 of the slide bearing portion 6 simulating the rotary squeeze pin raising / lowering system according to the present invention. The upper stage is a sectional view 12a, and the lower stage is a bottom view 12b.

  The frame member 12 has a cylindrical shape and has a hollow portion 12e with a bottom surface inside. A hole 12c having a diameter smaller than that of the hollow portion 12e is formed on the upper surface and penetrates vertically. In addition, two screw holes 12d for connecting to the U-shaped member 14 are formed on the bottom surface.

  FIG. 6 is a view showing the shaft member 13 of the slide bearing portion 6 simulating the rotary squeeze pin raising / lowering system according to the present invention. The upper stage is a plan view 13a and the lower stage is a front view 13b.

  The shaft member 13 has a cylindrical shape, and has a stopper 13c having a wide diameter at the lower portion. When the shaft member 13 is passed through the hole 12 c of the frame member 12, the stopper 13 c is caught on the upper surface of the frame member 12.

  FIG. 7 is a view showing the U-shaped member 14 of the slide bearing portion 6 simulating the rotary squeeze pin lifting / lowering method according to the present invention. The upper left side is a sectional view 14a, the upper right side is a side view 14b, and the lower stage is a bottom view 14c.

  The U-shaped member 14 has a U-shaped shape. The bottom surface has two through-holes 14d for connection with the frame member 12, and the side surface has a screw hole 14e for connection with the fixing member 15. Are vacated one at each end.

  FIG. 8 is a view showing the fixing member 15 of the slide bearing unit 6 simulating the rotary squeeze pin lifting / lowering system according to the present invention. The left side is a side view 15a and the right side is a front view 15b.

  The fixing member 15 has a rectangular parallelepiped shape, and two screw holes 15c are formed on the side surface thereof so as to be connected to the U-shaped member 14.

  FIG. 9 is a view showing the long rod 7 of the tensile test apparatus 2 with a shaft rotation mechanism simulating the rotary squeeze pin raising / lowering system according to the present invention. The upper stage is a sectional view 7a, and the lower stage is a bottom view 7b.

  The long rod 7 has a long rod shape, and is provided with a recess 7c for hanging on the slide bearing portion 6 at the upper portion, and the lower end 7d is thinned by cutting left and right. Moreover, the hole 7e for connecting with the insertion part 8 is opened in the front-end | tip 7d.

  FIG. 10 is a view showing the insertion portion 8 of the tensile test apparatus 2 with a shaft rotation mechanism simulating the rotary squeeze pin raising / lowering system according to the present invention. The upper stage is a plan view 8a, the lower stage left side is a sectional view 8b, and the lower stage right side is a side view 8c.

  The insertion portion 8 has a substantially cylindrical shape, and the upper receiving portion 8d is bifurcated, and the tip 7d of the long rod 7 is fitted therebetween. The receiving portion 8d is provided with holes 8e for connecting to the tip 7d of the long rod 7 on both sides.

  FIG. 11 is a diagram showing the frictional resistance generator 9 of the tensile test apparatus 2 with a shaft rotation mechanism that simulates the rotary squeeze pin lifting / lowering system according to the present invention. The upper part is a front view 9a, and the lower part is a bottom view 9b.

  The frictional resistance generator 9 includes an upper plate 9c, a front plate 16, a rear plate 17, and the like. The front plate 16 will be described in detail in FIG. 12, and the rear plate 17 will be described in detail in FIG.

  The upper plate 9c is a plate for attaching the frictional resistance generating portion 9 to the tensile test apparatus lifting / lowering portion 10, and has a through hole 9d for passing the long rod 7 in the center. A front plate 16 and a rear plate 17 are attached to the lower side.

  The tensile test apparatus lifting / lowering unit 10 and the upper plate 9c are connected by screws 9e, the upper plate 9c and the rear plate 17 are connected by screws 9f, and the front plate 16 and the rear plate 17 are connected by screws 9g. .

  FIG. 12 is a view showing the front plate 16 of the frictional resistance generator 9 simulating the rotary squeeze pin lifting / lowering system according to the present invention. The upper stage is a front view 16a, and the lower stage is a bottom view 16b.

  The front plate 16 is a rectangular parallelepiped plate, and has a semicircular recess 16c through which the long rod 7 passes on the front side. Two screw holes 16d are formed through the front surface for connection with the rear plate 17.

  FIG. 13 is a view showing the rear plate 17 of the frictional resistance generating section 9 simulating the rotary squeeze pin raising / lowering system according to the present invention. The upper stage is a front view 17a, and the lower stage is a bottom view 17b.

  The rear plate 17 has a rectangular parallelepiped shape larger than the front plate 16, and has a semicircular recess 17c through which the long rod 7 passes on the back side. Two screw holes 17d for connecting to the front plate 16 are formed on the front surface, and two screw holes 17e passing therethrough for connecting to the upper plate 9c are formed on the bottom surface.

  The hole 16c of the front plate 16 and the recess 17c of the rear plate 17 are combined to form a circular hole. The inner peripheral surface of the hole is made of the same material as the cast product 1d and is in close contact with the long rod 7. Thus, by moving the long rod 7 passed through the hole up and down, a frictional resistance 9 h is generated between the long rod 7 and the long rod 7.

  FIG. 14 is a diagram showing a rotation speed control device 3 of the tensile test device 2 with a shaft rotation mechanism simulating the rotary squeeze pin raising / lowering method according to the present invention. The rotation speed control device 3 includes a frame 3a, a base 3b, a motor 11, and the like. The motor 11 will be described in detail with reference to FIG.

  The motor 11 is an electric motor that generates a rotational force, and is fixed to the frame 3a by screws 3c. In addition, a base 3b for placing on the height adjusting jack 5 is provided below the frame 3a.

  FIG. 15 is a diagram showing the motor 11 of the rotational speed control device 3 simulating the rotary squeeze pin raising / lowering system according to the present invention. The motor 11 includes a main body 11a, an upper connection portion 11b, a lower connection portion 11c, and the like. Reference numeral 11e is a screw.

  The main body 11a has a mechanism for generating a rotational force, and rotates the lower connection portion 11c connected to the rotation shaft. Moreover, the insertion part 8 is inserted in the insertion hole 11d vacated in the center of the upper connection part 11b. The rotational force generated in the main body 11a can be transmitted to the plug-in part 8 by engaging and connecting the upper connection part 11b and the lower connection part 11c.

  FIG. 16 is a graph 20 showing a test result by the tensile test apparatus 2 with a shaft rotation mechanism simulating the rotary squeeze pin lifting / lowering system according to the present invention.

  First, a uniaxial tensile test 20a is performed in which the tensile test apparatus lifting / lowering unit 10 is moved until there is no play or the like and the constant stress is settled. When the uniaxial tensile stress settles to a constant value, the long speed rod 7 is moved by the rotational speed control device 3. A shaft rotation introduction tensile test 20b to be rotated is performed.

  In addition, the uniaxial tensile test 20a and the axial rotation introduction tensile test 20b were performed under the conditions that the moving speed of the tensile test apparatus lifting / lowering unit 10 was 5 mm / min and the axial rotation speed of the long rod 7 was 30 times / min.

As shown in the graph 20, when the axial rotation introduction tensile test 20 b was introduced when the stress was almost constant (21.2 kg / mm ² ) in the uniaxial tensile test 20 a, the stress decreased rapidly (average) Stress 8.5 kg / mm ² )

  FIG. 17 is a table 21 showing test results obtained by the tensile test apparatus 2 with a shaft rotation mechanism simulating the rotary squeeze pin lifting / lowering system according to the present invention.

  Table 21 shows the uniaxial tensile stress, the average stress during axial rotation, and the rate of decrease in frictional stress when the conditions of the moving speed of the lifting and lowering unit (crosshead) 10 and the axial rotational speed of the long rod 7 are changed. It is shown.

Crosshead speed of 5 mm / min, when the shaft rotation speed is 30 times / min (FIG. 16), uniaxial tensile stress at 21.2 kg / mm ^2, mean stress during shaft rotation 8.5 kg / mm ^2, and the The rate of decrease in frictional stress is 59.9%.

When the crosshead speed is 20 mm / min and the shaft rotation speed is 15 times / min, the uniaxial tensile stress is 14.0 kg / mm ² and the average stress during shaft rotation is 2.25 kg / mm ² . Is 83.4%.

When the crosshead speed is 20 mm / min and the shaft rotation speed is 30 times / min, the uniaxial tensile stress is 12.25 kg / mm ² , the average stress during shaft rotation is 2.25 kg / mm ² , and the friction stress reduction rate Is 81.6%.

Crosshead speed of 50 mm / min, when the shaft rotation speed is 15 times / min, in uniaxial tensile stress 14.0 kg / mm ^2, during shaft rotation mean stress is 4.0 kg / mm ^2, and the friction stress decrease ratio Is 71.4%.

When the crosshead speed is 50 mm / min and the shaft rotation speed is 30 times / min, the uniaxial tensile stress is 14.0 kg / mm ² , the average stress during shaft rotation is 3.0 kg / mm ² , and the friction stress reduction rate Is 78.6%.

As described above, when axial rotation is introduced into uniaxial tensile stress, it is clear that the frictional resistance decreases sharply, the crosshead speed is 5 to 50 kg / mm ² , and the axial rotation speed is 15 to 30 times / minute. Under the conditions, the frictional resistance is reduced by about 60% or more.

It is sectional drawing which shows the squeeze pin raising / lowering mechanism at the time of the high pressure casting which introduced the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the whole tensile test apparatus with a shaft rotation mechanism which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the axial rotation frictional resistance generation | occurrence | production part of the tensile test apparatus with an axial rotation mechanism which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the slide bearing part of the axial rotation frictional resistance generation part which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the frame member of the slide bearing part which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the shaft member of the slide bearing part which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the U-shaped member of the slide bearing part which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the fixing member of the slide bearing part which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the elongate rod of the tension test apparatus with an axial rotation mechanism which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the insertion part of the tension test apparatus with a shaft rotating mechanism which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the frictional resistance generation | occurrence | production part of the tension test apparatus with a shaft rotating mechanism which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the front board of the frictional resistance generation | occurrence | production part which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the rear board of the frictional resistance generation part which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the rotational speed control apparatus of the tension test apparatus with an axial rotation mechanism which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a figure which shows the motor of the rotational speed control apparatus which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a graph which shows the test result by the tension test apparatus with a shaft rotating mechanism which simulated the rotary squeeze pin raising / lowering system which is this invention. It is a table | surface which shows the test result by the tension test apparatus with a shaft rotating mechanism which simulated the rotary squeeze pin raising / lowering system which is this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Squeeze pin raising / lowering mechanism at the time of high-pressure casting 1a Squeeze pin 1b Upper die 1c Lower die 1d Casting product 1e Pouring direction 1f Squeeze pin position 2 Tensile test apparatus which introduced the axis rotation mechanism 2a Axle rotation friction resistance generating part 3 rotation Speed control device 3a Frame 3b Base 3c Screw 4 Swivel connector 4a Pin hole 5 Jack for height adjustment 6 Slide bearing part 6a Bearing 6b Centering prevention material 6c Fastener 6d Screw 6e Screw 7 Long rod 7a Cross section 7b Bottom view Fig. 7c Depression 7d Tip 7e Hole 7f Fastener 8 Insertion portion 8a Plan view 8b Cross-sectional view 8c Side view 8d Receiving portion 8e Hole 9 Friction resistance generating portion 9a Front view 9b Bottom view 9c Top plate 9d Through hole 9e Screw 9f 9f Screw 9h Friction resistance 10 Tensile test device lifting part 10a Through hole 11 Motor 11a Body 11b Top Continuation part 11c lower connection part 11d insertion hole 11e screw 12 frame member 12a sectional view 12b bottom view 12c hole 12d screw hole 12e hollow part 13 shaft member 13a plan view 13b front view 13c stopper 14 U-shaped member 14a sectional view 14b side view 14c Bottom view 14d Screw hole 14e Screw hole 15 Fixing member 15a Side view 15b Front view 15c Screw hole 16 Front plate 16a Front view 16b Bottom view 16c Recess 16d Screw hole 17 Rear plate 17a Front view 17b Bottom view 17c Recess 17d Hole 17d Screw hole 18 Tensile test device upper mount 19 Load detector 20 Graph 20a Uniaxial tensile test 20b Shaft rotation introduction tensile test 21 Table

Claims (1)

In high pressure casting, aluminum, which is a raw material of a cast product, is poured into a mold, and when the cast product is in a semi-molten state, the squeeze pin is lowered and pressurized, the cast surface is cut, and the squeeze pin is raised and lowered A rotary squeeze pin lifting system characterized by lowering frictional resistance by introducing a shaft rotation mechanism.

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