CN116945500A - Core mould demoulding mechanism - Google Patents

Abstract

The invention provides a core mold demoulding mechanism. The ring and the ring tube of the product to be formed are arranged concentrically and at a distance, and there are connecting arms parallel to the axial direction between them. The core mold includes a core for molding the inner end surface of the ring. The inner end face core mold of the ring has an air space core mold between the ring inner end face mandrel and the ring tube. The demoulding displacement direction of the air space core mold is perpendicular to the parting surface of the lower mold and the upper mold. The demoulding displacement direction of the core mold on the inner end face of the ring is parallel to the parting surface of the upper mold and the lower mold and moves toward the side of the ring tube, so as to solve the problem that the molding core mold for the annular part of the upper tube of the product to be formed cannot directly move vertically or parallel to the parting surface. The problem of surface demoulding.

Description

Core mold demoulding mechanism

Technical field

The present invention relates to the demoulding technology of injection molds.

Background technique

Injection molded products are highly praised by the industry for their high production efficiency. Due to the specific shape of the products to be injection molded, very high requirements are placed on the demoulding mechanism. In the existing technology, technicians provide corresponding solutions for injection molding products with specific shapes.

Products to be injection molded with relatively simple structural shapes generally include a simple box body or a pipe column. It becomes more difficult to mold the product when the two are combined into one body. And if the pipe column is a stepped or bent pipe section, use The demoulding direction of the core mold in the molding cavity is different from the parting displacement direction of the parting surfaces of the upper and lower main molds, which will gradually increase the difficulty of demoulding the core mold.

The Chinese patent document titled "A double-inclined top flap demoulding mechanism of an injection mold" (CN104859112A-hereinafter referred to as Document 1) discloses that the product to be injection molded includes a boss 101 (actually a pipe body) and a product 100 (mainly an open-shaped box body), Document 1 believes that the difficulty in molding lies in the demoulding of the flange 1011 after molding. In the solution provided by it, the upper part of the first inclined ejector rod 1 and the upper part of the second inclined ejector rod 2 cooperate with each other to form a circular recess consistent with the size of the protruding column 101. The first inclined ejector rod 1 and the second inclined ejector rod 1 The rod 2 moves in the direction to separate from the flange 1011 of the product 100 . The first inclined ejector rod 1 and the second inclined ejector rod 2 in this document 1 can actually still be understood as the molding mold for the outer wall of the product. Choosing the appropriate parting position can ensure the demoulding of the flange 1011 and the mold. Fortunately, the cavity in the middle of the protruding column 101 is a cylindrical shape with equal cross-section, and there is no difficulty in extracting the mandrel used to form the cavity.

The Chinese patent document titled "A handle demoulding mechanism and its forming structure" (CN105058711A-hereinafter referred to as Document 2) discloses a demoulding scheme for a handle forming mold. The handle half can be regarded as a semi-cylindrical plate or It can be directly understood as a curved plate with an open box connected to the handle end. There is no particular difficulty in its molding, because there is nothing special about the upper and lower parting forms or the front and rear molds (or left and right molds), especially the The direction of the hole core on the column position can be set perpendicular to the parting surface of the mold. Even if there is an asymmetrical angle of 80° or 100° between the handle and the bottom of the box at the handle end, the molding problem can be solved smoothly by selecting a suitable parting surface.

The product 1 to be formed shown in Figure 1 has a ring 2 at one end and a ring tube 3 at the other end. The ring 2 and the ring tube 3 are concentrically arranged. The ring 2 and the ring tube 3 are connected parallel to their axial direction. Arm 4, since there is a spatial distance between the axial direction of the ring 2 and the ring tube 3 and there is a convex ring 2a on the inner end surface of the ring 2, the mandrel used to form the space area between the ring 2 and the ring tube 3 needs to form the convex ring. 2a. At the same time, since the cross-section of the connecting arm 4 is in the shape of a fan arc, the upper and lower molds can use appropriate parting surfaces to form the outer wall of the product 1 to be formed, which is used to form the space between the connecting arm 4, the ring 2, and the ring pipe 3. The core mold in the space area needs to form the convex ring 2a, and the demoulding of the core mold is an urgent problem that needs to be solved. Of course, the process holes 5 arranged on the wall of the ring pipe 3 can be moved and demoulded after the upper and lower molds are separated, so there is no particular difficulty in demoulding the core mold of the process holes 5 .

Contents of the invention

The object of the present invention is to provide a core mold demoulding mechanism to solve the problem that the molding core mold in the annular part of the upper tube of the product to be formed cannot be demoulded directly vertically or parallel to the parting surface.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A core mold demoulding mechanism includes a lower mold that cooperates with the upper mold for molding products to be molded. It is characterized in that: the ring and the ring tube of the product to be molded are concentric and spaced apart, and there is a gap between them. The connecting arm is parallel to the axial direction. The mandrel includes an inner end face mandrel for forming the inner end face of the ring. There is an air space mandrel between the ring inner end face mandrel and the ring tube. The separation of the air space mandrel The mold displacement direction is perpendicular to the parting surface of the lower mold and the upper mold, and the demoulding displacement direction of the core mold on the inner end face of the ring is parallel to the parting surface of the upper mold and the lower mold and moves toward the side of the ring tube.

In the above technology, the mandrel in the space area between the connecting arms, rings, and ring tubes on the product to be formed is composed of an axially adjacent inner end face mandrel of the ring and an air space mandrel. The area surrounded by the connecting arm and the ring tube has an air space. The mandrel is directly displaced relative to the direction perpendicular to the parting surface and demoulded first. In this way, the mandrel on the inner end face of the ring is directed away from the ring on the product to be formed and parallel. A displacement space is provided in the direction of the parting surface, and the core mold on the inner end face of the ring is axially separated from the ring to achieve demolding.

Description of the drawings

Figures 1 and 2 are schematic diagrams of the three-dimensional structure of the product to be formed;

Figure 3 is a cross-sectional view of the product to be formed;

Figure 4 is a schematic three-dimensional structural diagram of the parting surface of the lower mold of the present invention;

Figure 5 is a perspective view of the core mold on the inner end surface of the ring on the lower mold in Figure 4 in a demoulding state;

Figures 6, 7, and 8 are respectively schematic diagrams of the demoulding state of the core mold on the inner end face of the ring on the lower mold;

Figures 6a, 7a, and 8a are partial enlarged schematic views of Figures 6, 7, and 8 respectively;

Figure 9 is a schematic three-dimensional structural diagram of the inner end face core mold of the ring;

Figure 10 is a schematic diagram of the mating state of the ring inner end face mandrel and the product to be formed during the demoulding process;

Figure 11 is a partial enlarged schematic diagram of the figure.

Detailed ways

As shown in Figures 1, 2, and 3, the ring 2 and the ring tube 3 of the product to be formed 1 are arranged at concentric intervals and have a connecting arm 4 parallel to the axial direction between them. The core mold ejection mechanism designed by the present invention , including a lower mold 10 that cooperates with the upper mold parting. The upper mold is not shown in the drawings. The core mold provided on the lower mold 10 includes a ring inner end face core mold 30 for forming the inner end face of the ring 2. The ring There is an air space core mold 40 between the inner end face core mold 30 and the ring pipe 3. The demoulding displacement direction of the air space core mold 40 is perpendicular to the parting surfaces of the upper and lower molds 10 and 20. The inner end face core of the ring is The demoulding displacement direction of the mold 30 is parallel to the parting surfaces of the upper and lower molds 10 and 20 and moves toward the side of the ring pipe 3 .

In the present invention, in order to ensure the integrity of the outer wall surface of the product to be formed 1, that is, to minimize the occurrence of burrs on the parting surfaces other than the parting surfaces of the upper and lower molds, the airspace core mold 40 is directly processed on the lower mold 10. After the injection molding is completed, first, with the help of the lifting action of the ring inner end face mandrel 30, the ring inner end face mandrel 30 and the air space mandrel 40 are displaced in height and avoid each other. At this time, the product 1 to be molded and the ring inner end face are then moved. The axial separation displacement of the core mold 30 realizes the demoulding action of the core mold; if the air space core mold 40 is designed as a movable mold that can move up and down, that is, the core mold 30 on the inner end face of the ring is kept in the original position, down The airspace mandrel 40 is moved to realize that the annular inner end face mandrel 30 and the airspace mandrel 40 are displaced in height and avoid each other.

As shown in Figures 4 to 8, there is a blind hole 31 on the outer end surface of the inner end face core mold 30 of the ring, and the diameter of the blind hole 31 is consistent with the outer diameter of the convex ring 2a on the inner end face of the ring 2. The upper and lower edges of the end core mold 30 are flush with the upper and lower parts of the ring 2 . Using the annular inner end face mandrel 30 of the above solution, the peripheral surface of the convex ring 2a can be formed, and the inner end surface of the convex ring 2a and the annular ring 2 can be formed simultaneously.

With reference to Figures 9, 10, and 11, the upper part of the ring inner end face mandrel 30 includes a semicircular outer cylinder 32, and the lower edges on both sides of the semicircular outer cylinder 32 extend downward along the plumb bob surface. A straight wall surface 33 is formed, and there is an external step 331 at the lower edge of the straight wall surface 33. The lower edges on both sides of the semi-cylindrical surface 42 of the air space core mold have parallel lower sides extending downward along the plumb bob surface and correspondingly arranged Steps, not shown in the figure, during molding, the semicircular outer cylinder 32, the straight wall surface 33 and the steps 331 are coplanar with the semicylindrical surface 42, the lower side and the corresponding steps of the airspace core mold to form the connecting arm 4 The upper half 4a, the lower half 4b and the lower side 4c of the inner wall.

The above scheme can form the product 1 to be formed as shown in Figure 3, that is, the cross-sectional view perpendicular to the direction of the tube core can be seen that the cross-section of the connecting arm 4 is not a sector in the strict mathematical sense, that is, the cross-section of the connecting arm 4 The cross-section of the upper part 4a shown is fan-shaped, and the inner surfaces of the lower part 4b are plumb bob surfaces parallel to each other. This ensures that demoulding can be achieved when the radial wall thickness of the connecting arm 4 is equal, that is to say, the connection The outer wall of the arm 4 is a cylindrical surface with the tube core as the axis. The inner wall surface of the upper half 4a is still a cylindrical surface. The inner surface of the lower half 4b on the opposite side is equidistantly arranged. When demoulding, the inner end surface core of the ring is Both the mold 30 and the airspace core mold 40 can be displaced downward relative to the connecting arm 4 and separated.

As shown in Figures 4 and 9, the lower mold 10 has a flat annular hole core mold 20 for forming the inner hole of the annular ring 2. The free end of the annular hole core mold 20 extends to the blind hole of the annular inner end face core mold 30. 31 hole bottom. This solution realizes the forming of the inner hole of the forming ring 2.

The lower mold 10 is provided with a top seat 60. The top seat 60 has a closed guide groove 61. The closed guide groove 61 has an opening upward and the length of the groove is parallel to the axial direction of the product 1 to be formed. The inner end face of the ring is a mandrel. There is a slider 34 at the lower end of the slider 30 extending downward. The cross-sectional shape of the slider 34 matches the narrowed guide groove 61 and the slider 34 slides in the length direction of the groove defined by the narrowed guide groove 61 . The top base 60 is connected to the lifting mechanism 62 below. When the lifting mechanism 62 rises and falls, it drives the ring inner end face mandrel 30 to move up and down. At the same time, the ring inner end face mandrel 30 will slide along the length of the closed guide groove 61.

In order to realize the inner end face core mold 30 of the annular ring sliding along the length direction of the narrowed guide groove 61 , the lower mold 10 is provided with a driving unit that drives the slider 34 to slide in the narrowed guide groove 61 .

The structure of the preferred driving unit will be described below. That is, there is a guide hole 35 at the upper end of the ring inner end face core mold 30. The penetration direction of the guide hole 35 is parallel to the axial direction of the product 1 to be formed. A sliding plate 50 is provided in the guide hole 35. The sliding plate 50 relatively slides in the horizontal direction defined by the guide hole 35. There is a plumb bob penetrating guide rail 11 below the molding surface of the lower mold 10. The sliding plate 50 moves up and down along the plumb bob defined by the guide rail 11, so The above-mentioned sliding plate 50 is located at the outer end of the inner end face of the ring core mold 30 and has a bracket 51 that supports the bottom of the ring 2 of the product 1 to be formed. The height of the upper table of the bracket 51 is lower than the lowest position of the convex ring 2a. Above the lowest level of ring 2. Since the pallet 51 can only move up and down with the sliding plate 50 on the plumb bob defined by the guide rail 11, and when the inner end face mandrel 30 of the ring moves axially away from the ring 2, the pallet 51 blocks the ring 2. This prevents the product 1 to be formed from being axially separated and demolded due to the synchronous displacement of the inner end face core mold 30 of the ring.

The rod surface of the mold rod 36 extending downward from the ring inner end face mandrel 30 and located on the side of the ring 2 of the product 1 to be formed is an inclined surface 361, and this inclined surface forms an incline with the inclined rail surface 111 on the corresponding side of the guide rail 11. Built-in abutment fit;

With reference to Figures 6 to 10, the guide rail 11 is a hole with a rectangular horizontal cross-section. The upper section of the guide rail is a straight hole with a plumb bob direction, and the front hole wall of the lower section is a slope 111. The long diameter direction of the hole of the guide rail 11 is consistent with that to be formed. The axial direction of product 1 is parallel. The shaft of the mold rod 36 is located in the plumb bob plane and is arranged diagonally. Its slope is consistent with the slope of the slope 111. The horizontal section of the mold rod 36 is square. The rod surface parallel to the axial direction of the product 1 to be formed is in sliding fit with the long diameter side hole wall of the guide rail 11; The spacing is smaller than the spacing between the short diameter hole walls of the guide rail 11.

In Figures 6, 7, and 8, the axial direction of the product 1 to be formed is the direction of the axis A in the figure, and between the rod surfaces of the mold rod 36 in the horizontal section that are perpendicular to the axial direction of the product 1 The spacing is smaller than the spacing between the short diameter hole walls of the guide rail 11, that is, the mold rod 36 can be displaced left and right within the hole range of the guide rail 11.

The joint between the inner end face core mold 30 of the annular ring and the space core mold 40 is in a bevel manner, and the slope of the slope between them is consistent with the slope of the mold rod 36 . In Figure 8, the upper left part of the airspace mandrel 40 is an inclined surface 41. The inclined surface 41 is consistent with the inclination of the mold rod 36. The right end surface of the inner end face mandrel 30 of the ring that is in contact with the airspace mandrel 40 is also the same. This ensures that when the ring inner end surface mandrel 30 and the air space mandrel 40 are fitted, the tops and adjacent lower parts of the two are flush to form a complete forming surface to shape the complete connecting arm 4, and due to the circular When the inner end face mandrel 30 of the ring is lifted, a spacing space is reserved on the left side of the mold rod 36 and the airspace mandrel 40, which provides space for the rightward displacement of the mold rod 36, and when the mold rod 36 moves to the right, the mold rod 36 will It will be a close fit of the surface contact between the shaft of the mold rod 36 and the inclined surface 41, which prevents the upper left part of the airspace core mold 40 from being crushed by the impact of the mold rod 36, thus ensuring that the inner end face core of the ring is The integrity of the molding surface formed by the cooperation between the mold 30 and the airspace core mold 40.

The demoulding process of the present invention is briefly described below:

As shown in Figure 4, the upper mold has been lifted away from the lower mold 10, and the formed product 1 to be formed is located on the lower mold 10. After the relevant core mold that is convenient for demoulding, such as the annular hole core mold 20, has been demoulded, the process can be implemented. The ring inner end face mandrel 30, the air space mandrel 40 and the product to be formed 1 in the invention have been demoulded.

As shown in Figures 6 and 6a, the lifting mechanism 62 moves upward to push the ejector seat 60 to rise. The mold rod 36 together with the sliding block 50 in the upper section of the mold rod 36 moves upward in the cavity of the guide rail 11. At the initial stage of the rise, the left and right sides of the mold rod 36 The club face has no contact with the left hole wall of the guide rail 11, and the ring inner end face mandrel 30 is still nested on the convex ring 2a, so the formed product 1 rises simultaneously and is demoulded from the air space mandrel 40;

In Figures 7 and 7a, the lifting mechanism 62 further moves upward. At this time, the left side of the mold rod 36 begins to contact the left hole wall of the guide rail 11 and there is a gap left between the right side of the mold rod 36 and the airspace mandrel 40. Space spacing, under the blocking effect of the slope of the left hole wall of the guide rail 11, the mold rod 36 simultaneously moves upward and to the right. Since the sliding plate 50 can only move upward under the restriction of the left and right hole walls of the guide rail 11, the sliding The upper left corner of the plate 50 blocks the right end surface of the ring 2 below the convex ring 2a, thereby limiting the formed product 1 to synchronously shift to the right with the ring inner end face mandrel 30, and the formed product 1 and the ring inner end face core The axial separation displacement of mold 30 gradually increases;

In Figures 8 and 8a, the lifting mechanism 62 continues to move upward, and the right side of the mold rod 36 is in contact with the inclined surface 41 of the upper right section of the guide rail 11, that is, the upper left part of the airspace mandrel 40. At this time, the convex surface of the molded product 1 has been formed. The ring 2a is completely separated from the inner end face core mold 30 of the ring. At this time, the formed product 1 can be picked up and separated from the mold.

Claims (12)

1. The utility model provides a mandrel demoulding mechanism, includes lower mould (10) that are used for shaping product (1) that wait to take shape with last mould parting cooperation, its characterized in that: the annular ring (2) of the product (1) to be molded and the annular pipe (3) are concentric, the spacing arrangement is provided with a connecting arm (4) parallel to the axial direction, the core mold comprises an annular inner end surface core mold (30) for molding the inner end surface of the annular ring (2), an airspace core mold (40) is arranged between the annular inner end surface core mold (30) and the annular pipe (3), the demolding displacement direction of the airspace core mold (40) is perpendicular to the parting surface of the lower mold (10) and the upper mold, and the demolding displacement direction of the annular inner end surface core mold (30) is perpendicular to the compound motion of the parting surface of the lower mold (10) and the parting surface of the upper mold and is displaced to the side of the annular pipe (3).

2. The core mold release mechanism according to claim 1, wherein: the outer end face of the core mould (30) at the inner end of the circular ring is provided with a blind hole (31), and the aperture of the blind hole (31) is consistent with the outer diameter of the convex ring (2 a) at the inner end face of the circular ring (2).

3. The core mold release mechanism according to claim 1 or 2, wherein: the upper and lower edges of the core mould (30) at the inner end surface of the circular ring are flush with the upper and lower parts of the circular ring (2) at the same height.

4. The core mold release mechanism according to claim 1 or 2, wherein: the upper part of the mandrel (30) with the inner end surface of the circular ring comprises a semicircular outer cylindrical surface (32), the lower edges of the two sides of the semicircular outer cylindrical surface (32) downwards extend along the plumb face to form a straight wall surface (33), and an external step (331) is arranged at the lower edge of the straight wall surface (33).

5. The core mold release mechanism according to claim 4, wherein: the upper part of the airspace core mould (40) comprises an airspace core mould semi-cylindrical surface (42), and lower edges of two sides of the airspace core mould semi-cylindrical surface (42) are provided with lower side surfaces which extend downwards along the plumb face and are parallel to each other and steps which are correspondingly arranged.

6. The core mold release mechanism according to claim 4, wherein: the lower die (10) is provided with a horizontally arranged annular hole core die (20) for forming an inner hole of the annular ring (2), and the free end of the annular hole core die (20) is propped against the bottom of a blind hole (31) of the annular inner end surface core die (30).

7. The core mold release mechanism according to claim 1, wherein: the lower die (10) is provided with a top seat (60), a closing-in-shape guide groove (61) is arranged on the top seat (60), the notch of the closing-in-shape guide groove (61) is upward, the groove length direction is parallel to the axial direction of a product (1) to be formed, the lower end of the downward extension of the core die (30) at the inner end of the circular ring is provided with a sliding block (34), the section shape of the sliding block (34) is matched with the closing-in-shape guide groove (61), and the sliding block (34) slides in the groove length direction limited by the closing-in-shape guide groove (61).

8. The core mold release mechanism according to claim 8, wherein: the lower die (10) is provided with a driving unit for driving the sliding block (34) to slide in the convergent guide groove (61).

9. The core mold release mechanism according to claim 8, wherein: the upper end of the inner end face core mold (30) of the circular ring is provided with a guide hole (35), the penetrating direction of the guide hole (35) is parallel to the axial direction of a product (1) to be molded, a sliding plate (50) is arranged in the guide hole (35), the sliding plate (50) horizontally slides and displaces under the molding surface of the lower mold (10) in a limiting manner, a plumb is arranged under the molding surface of the lower mold (10) and is upwards and downwards displaced on the guide rail (11), the sliding plate (50) is positioned at the outer end of the inner end face core mold (30) of the circular ring and is provided with a supporting table (51) supporting the bottom of the circular ring (2) of the product (1) to be molded, and the height of the upper table top of the supporting table (51) is lower than the lowest position of the convex ring (2 a) and higher than the lowest position of the circular ring (2).

10. A mandrel stripper mechanism as defined in claim 7 or 8 or 9, wherein: the surface of the mould rod (36) which extends downwards and is positioned on the side of the circular ring (2) of the product (1) to be formed is an inclined surface, and the inclined surface and an inclined rail surface (111) on the corresponding side of the guide rail (11) form inclined abutting fit.

11. A mandrel stripper mechanism as defined in claim 7 or 8 or 9, wherein: the guide rail (11) is a hole with a rectangular horizontal cross section, the upper section of the guide rail is a straight hole with a plumb direction, the front side hole wall of the lower section is an inclined surface (111), the long diameter direction of the hole of the guide rail (11) is parallel to the axial direction of a product (1) to be formed, the shaft body of the die rod (36) is positioned in the plumb surface and is obliquely arranged, the inclination of the die rod is consistent with that of the inclined surface (111), the horizontal cross section of the die rod (36) is square, and the axial rod surface parallel to the product (1) to be formed on the die rod (36) is in close sliding fit with the long diameter hole wall surface of the guide rail (11); the distance between the axial faces of the mold bars (36) in the horizontal cross section, which faces are perpendicular to the product (1) to be molded, is smaller than the distance between the walls of the short-diameter holes of the guide rail (11).

12. The core mold release mechanism according to claim 11, wherein: the junction of the core mould (30) at the inner end surface of the circular ring and the mould rod (36) and the joint of the airspace core mould (40) are in inclined plane fit, and the inclination of the inclined plane between the junction and the airspace core mould is consistent with that of the mould rod (36).