TWI422478B - Demoulding device - Google Patents

Description

Release device for shifting needle roller anti-breaking oblique pin

The invention relates to a demoulding device for a shifting needle anti-breaking pin, which is applied to an injection mould having a barb, groove or convex structure.

The plastic parts of electronic products often form a snap-on condition when they are mated with each other. The buckle is an "embedded" or integrally latched mechanism that connects one part to another. It is usually used in the joining of plastic parts to achieve a mechanical connection between the parts. To make a product with a buckle or a barb through the mold, it is necessary to provide a mold for casting the product, and use a skew pin to form a buckle or a barb in the mold, and the ejector pin is used to release the mold. The finished product of this product. Furthermore, the concave and convex shape of the plastic product is mainly divided into two types: the outer side surface unevenness and the inner side surface unevenness. The oblique pin can be used in the mold to form the concave or convex shape or the side hole of the inner side surface, and the oblique pin and the thimble can be driven during the mold opening. The finished product moves together and leaves the mold cavity.

In the prior art, the oblique pin adopts a square pattern, and moves up and down by the push plate pushing action, and the oblique pin slides in a frictional manner in a plane sliding manner in the oblique pin hole of the mold core. Since the oblique pin and the oblique pin hole are closely fitted together, when the oblique pin moves up and down in a plane friction manner, the force working surface is easy to wear, and it is not easy to bite and jam after being heated, and the working face is not affected. The oblique pin holes are in contact with the whole surface and are closely attached. When the heat is expanded, the sliding protrusions are easily caused in the process of sliding each other, thereby causing the seizure to be stuck, so that the oblique pins are often pulled off. Therefore, the above problems are the object of the present invention.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a demolding apparatus that effectively prevents the skew pin from being pulled apart to extend the service life of the skew pin.

In order to achieve the above object of the present invention, the present invention provides a demolding device for a shifting needle anti-breaking pin, comprising a movable mold core disposed in a movable mold and having an oblique pin hole, wherein the oblique pin hole is A square-shaped oblique pin is provided, and the positioning surface at the upper end of the oblique pin is attached to the upper end surface of the oblique pin hole. The two sides of the middle portion of the oblique pin are respectively provided with rolling grooves, and the rolling groove is provided with a rolling member group for rolling friction corresponding to the two sides of the oblique pin hole, the rolling groove and the rolling member group are axially perpendicular to each other, and the two side walls of the rolling groove are provided There is a spring chute, the elastic chute is provided with an elastic piece along which the elastic piece is disposed, and the elastic piece is provided with a corresponding opening corresponding to the rolling piece set, and the opening is used for framing the rolling piece of the rolling piece set. The lower end of the oblique pin is provided with a lateral sliding groove, and the horizontal sliding groove is connected with the upper end of the longitudinal push rod. The flange of the lower end of the longitudinal push rod is installed in the stepped circular hole of the longitudinal push rod fixing plate, and the longitudinal push rod fixing plate is fixed by the bolt and the push plate. The push plate and the longitudinal push rod are used to push the oblique pin to slide obliquely in the oblique pin hole, and also perform lateral core pulling release while ejecting the finished product.

The invention has the advantages that the design of the rolling element group adopts the design of the rolling element group to improve the situation that the oblique pin is easy to be caught and breaks when the oblique pin hole is pushed out, thereby effectively preventing the occurrence of the jamming of the oblique pin and prolonging the service life. This makes the skew pin more reliable in the work of demolding and ejection.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

12‧‧‧Molding plate

14‧‧‧Longitudinal push rod fixing plate

14a‧‧‧step round hole

16‧‧‧ push board

18‧‧‧Injection molding machine ejector

20‧‧‧ oblique pin

22‧‧‧ longitudinal putter

22a‧‧‧Front of the lower end of the longitudinal push rod

24‧‧‧ rolling groove

26‧‧‧Rolling set

28‧‧‧Shaft chute

30‧‧‧Elastic film

32‧‧‧ mouth

34‧‧‧ 动模仁

34a‧‧‧ oblique pin hole

36‧‧‧Transverse chute

40‧‧‧Manufactured goods

50‧‧‧Moving mold fixing plate

60‧‧‧ bolts

X‧‧‧ upper end positioning surface of the oblique pin

Y‧‧‧ upper end of the oblique pin hole

A1, A2‧‧‧ force working face

B1, B2‧‧‧ non-stressed work surface

1A is a vertical view of a mold and a skew pin structure during mold clamping according to an embodiment of the present invention.

1B is a side view of a side view of a mold and a skew pin structure during mold clamping according to an embodiment of the present invention.

2A is a front elevational view showing the single structure of a needle skewer according to an embodiment of the present invention.

2B is a right side view (including a partial cross-sectional view of the M-M) of the single structure of the needle skewer according to the embodiment of the present invention.

2C is a partially enlarged schematic view of the E direction of FIG. 2B.

2D is a top cross-sectional view of the N-N side of FIG. 2A.

2E is a partially enlarged schematic view of the D direction of FIG. 2D.

3 is a perspective view of an elastic piece according to an embodiment of the present invention.

4A is a first schematic view of a demolding ejection process according to an embodiment of the present invention (opening die ejection starting point).

FIG. 4B is a schematic side view of the side of the demoulding ejection process according to an embodiment of the present invention (opening die ejection starting point).

FIG. 5A is a schematic view 2 (opening end of the mold opening) in the process of demolding and ejecting according to an embodiment of the present invention.

FIG. 5B is a side view of the side of the demolding ejection process according to an embodiment of the present invention (opening die exit end point).

FIG. 6A is a schematic view of the skew pin in the returning process according to the embodiment of the present invention (the oblique pin pulls back the end point).

FIG. 6B is a schematic side view of the skew pin in the returning process according to the embodiment of the present invention (the oblique pin pulls back the end point).

FIG. 7A is a schematic diagram of a mold clamping process according to an embodiment of the present invention (moving mode return end point).

FIG. 7B is a schematic side view of the mold clamping process according to an embodiment of the present invention (moving mode return end point).

The invention provides a demoulding device for a shifting needle anti-breaking oblique pin, the demoulding device of the shifting needle anti-breaking oblique pin is used for detaching the finished product from the mold, and has a barb and a groove Or a finished product of raised structure.

1A is a perspective view of a mold and a skew pin structure in a mold clamping according to an embodiment of the present invention, and FIG. 1B is a side view of a mold and a skew pin structure in a mold clamping according to an embodiment of the present invention, and FIG. 2A is a needle skewer according to an embodiment of the present invention; 2B is a front view of a single structure of a needle roller pin (including a partial cross-sectional view of MM), FIG. 2C is a partially enlarged view of the E direction of FIG. 2B, and FIG. 2D is a partial view of the NN of FIG. 2A. The cross-sectional view is seen from the side, and FIG. 2E is a partially enlarged view of the D direction of FIG. 2D. Please refer to FIG. 1A, FIG. 1B, FIG. 2A, FIG. 2B, FIG. 2C and FIG. 2E at the same time, as shown in the figure:

The movable mold core 34 is disposed in the movable mold, the movable mold is disposed on the movable mold fixing plate 50, and the movable mold core 34 has an oblique pin hole 34a, and the oblique pin hole 34a is disposed in the movable mold core 34 in an inclined pattern. Moreover, the inclination angle of the oblique pin hole 34a is determined according to actual needs. The oblique pin hole 34a is provided with a square-shaped oblique pin 20, which is inclined The positioning surface X at the upper end of the pin 20 closely fits the upper end surface Y of the oblique pin hole 34a. The two side faces B1 and B2 of the middle portion of the oblique pin 20 are respectively provided with rolling grooves 24, and the rolling groove 24 is provided with a rolling member group 26 for performing rolling friction on both sides corresponding to the oblique pin holes 34a. The lower end of the oblique pin 20 is provided with a lateral chute 36. The lateral chute 36 is connected to the upper end of the longitudinal push rod 22, and the flange 22a at the lower end of the longitudinal push rod 22 is mounted in the stepped circular hole 14a of the longitudinal push rod fixing plate 14. The longitudinal push rod fixing plate 14 is fixed to the push plate 16 by bolts 60. The push pin 16 and the longitudinal push rod 22 are used to push the oblique pin 20 to slide obliquely in the oblique pin hole 34a, and also perform lateral core pulling release while ejecting the finished product 40.

3 is a perspective view of an elastic piece according to an embodiment of the present invention. Please refer to FIG. 2A, FIG. 2B, FIG. 2C, FIG. 2E and FIG. As shown in the figure, the two sides of the middle portion of the oblique pin 20 are respectively provided with rolling grooves 24 axially perpendicular to the rolling member group 26. The two side walls of the rolling groove 24 are provided with elastic sliding grooves 28, and the elastic sliding grooves 28 are provided along the elastic pieces. The elastic piece 30 of the sliding groove 28 is disposed, and the elastic piece 30 is provided with a through opening 32 corresponding to the rolling element set 26, and the opening 32 is used to frame the rolling elements of the rolling member set 26, such as rollers or balls. The two sides of the middle section of the oblique pin 20 may be the force-receiving working faces A1 and A2, or may be the non-stressed working faces B1 and B2. The rolling member set 26 may be a roller group or a ball group. Since the oblique pin 20 and the oblique pin hole 34a are separated by a roller group or a ball group, line contact heat transfer is formed, and the oblique pin 20 and the oblique pin hole 34a are greatly reduced. The thermal expansion and contraction effect caused by surface contact heat transfer. The length of the rolling groove 24 should be the sum of the half of the slip length of the skew pin 20 plus the total length of the rolling element set 26.

4A is a schematic view 1 (opening die ejection starting point) of the demolding ejection process according to an embodiment of the present invention, and FIG. 4B is a schematic side view (opening die ejection starting point) of the demolding ejection process according to an embodiment of the present invention; 5A is a schematic diagram 2 of the demolding ejection process (opening die exit end point) of the embodiment of the present invention, and FIG. 5B is a side view 2 (opening die ejection end point) of the demolding ejection process according to an embodiment of the present invention, FIG. 6A FIG. 6B is a schematic side view of the oblique pin in the returning process (the end of the oblique pin pullback), and FIG. 7A is a schematic view of the embodiment of the present invention. The schematic diagram of the embodiment in the mold clamping process (the end point of the moving mode return), FIG. 7B is the embodiment of the present invention. A side view of the mold process (the end of the moving mode return). 4A to 7B, as shown in FIGS. 4A to 5B, when the oblique pin 20 is ejected, the skew pin 20 is moved upward by 1 mm in the oblique pin hole 34a of the movable mold core 34, and the rolling member group 26 is moved. It is moved upward by 0.5 mm with respect to the oblique pin hole 34a of the movable mold core 34. As shown in FIG. 6A and FIG. 6B, when the oblique pin 20 is returned, the oblique pin 20 is pulled back by 1 mm in the oblique pin hole 34a of the movable mold core 34, and the rolling member group is opposed to the oblique pin hole of the movable mold core 34. Pull back 0.5mm in 34a. Therefore, when the mold opening is ejected, the longitudinal push rod 22 pushes the tilt pin 20 to the top end of the oblique pin hole 34a, and the rolling element group 26 of the tilt pin 20 is also rollingly displaced to the bottom end of the rolling groove 24. When returning, the longitudinal push rod 22 pulls the tilt pin 20 back to the lowest point of the oblique pin hole 34a, and the rolling element set 26 of the oblique pin 20 is also rollingly displaced to the topmost end of the rolling groove 24.

In this embodiment, the roller group is used as the rolling member group 26. As shown in Figs. 7A and 7B, the push plate 16 is supported by the movable mold base plate 12 of the movable mold during injection molding. As shown in FIG. 4A to FIG. 5B, when the mold is released, the push plate 16 moves downward with the movable mold fixing plate 50 and the movable mold base plate 12 for a displacement, and the injection molding machine top rod 18 is lifted upward and pushes the push plate. 16 and the oblique pin 20 moves upward to eject the finished product 40. As shown in FIG. 6A and FIG. 6B, when the position is returned, the injection molding machine ejector 18 is pulled down to drive the push plate 16 and the oblique pin 20 to move downward in the same direction, and when the push plate 16 is in contact with the movable mold fixing plate 50, The skew pin 20 is returned to the end point (ie, the initial position of the skew pin when the mold is closed).

The invention utilizes the rolling elements to perform both rolling and displacement in the channel, thereby effectively reducing the defects caused by the plane slippage of the oblique pin in the demolding movement, and prolonging the service life of the oblique pin, which can be said to be remarkable.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

12‧‧‧Molding plate

14‧‧‧Longitudinal push rod fixing plate

14a‧‧‧step round hole

16‧‧‧ push board

18‧‧‧Injection molding machine ejector

20‧‧‧ oblique pin

22‧‧‧ longitudinal putter

22a‧‧‧Front of the lower end of the longitudinal push rod

24‧‧‧ rolling groove

26‧‧‧Rolling set

30‧‧‧Elastic film

34‧‧‧ 动模仁

34a‧‧‧ oblique pin hole

36‧‧‧Transverse chute

40‧‧‧Manufactured goods

50‧‧‧Moving mold fixing plate

60‧‧‧ bolts

Y‧‧‧ upper end of the oblique pin hole

Claims (6)

A demoulding device for a shifting needle anti-breaking oblique pin comprises a movable mold core disposed in the movable mold and having a skew pin hole, wherein the oblique pin hole is provided with a square-shaped oblique pin. The positioning surface of the upper end of the oblique pin is attached to the upper end surface of the oblique pin hole; the two sides of the middle portion of the oblique pin are respectively provided with a rolling groove, and the rolling groove is provided with a rolling friction corresponding to the two sides of the oblique pin hole. a rolling element set, the rolling groove and the rolling element group are axially perpendicular to each other, and two side walls of the rolling groove are provided with an elastic piece sliding groove, and the elastic piece sliding groove is provided with an elastic piece which slides along the elastic piece sliding groove, the elasticity The sheet is provided with a through opening corresponding to the rolling member set, the opening is for framing the rolling member of the rolling member set; the lower end of the oblique pin is provided with a transverse sliding groove, the transverse sliding groove and a longitudinal sliding rod The upper end of the longitudinal push rod is mounted in a stepped circular hole of a longitudinal push rod fixing plate, and the longitudinal push rod fixing plate is fixed by a push plate by a bolt; Pushing the skew pin to slide obliquely in the oblique pin hole and ejecting a finished product Do also release lateral core pulling. A demolding device for a shifting needle anti-slip pin according to claim 1, wherein the length of the rolling groove is a sum of a half of the slip pin length plus a total length of the rolling member group. The demolding device for the shifting needle anti-slip pin according to the first aspect of the invention, wherein the two sides of the middle portion of the skew pin are any one of a forced working surface and a non-stressed working surface. The demolding device for the shifting needle anti-smashing pin according to the first aspect of the invention, wherein the rolling member group is any one of a roller group and a ball group. The demolding device for the shifting needle anti-slip pin according to claim 1, wherein the push plate is supported by a movable die plate of the movable mold when injection molding, and when the mold is opened, the push After the plate moves down a displacement together with the movable mold plate and the movable mold base plate, an injection molding machine top rod moves upward, and pushes the push plate and the oblique pin to move upward to eject the finished product, and when returning the position , the injection molding The top rod is pulled back to drive the push plate and the oblique pin to move downward in the same direction, and when the push plate contacts the movable mold fixing plate, the oblique pin returns to the end point. The demolding device for the shifting needle anti-slip pin according to claim 1, wherein the longitudinal pusher pushes the oblique pin to the most oblique pin hole when the mold is ejected An apex, the rolling element set of the skew pin is also rollingly displaced to the bottom end of the rolling groove, and when the vertical push rod pulls the oblique pin back to the lowest point of the oblique pin hole when the position is returned, the rolling piece The group also scrolls back to the top of the scroll slot.