CN212385893U - Mould for demolding convex ribs in inner cavity of double-wall plastic compression piece in multiple times - Google Patents

Abstract

The utility model discloses a double-layer wall compression molding inner cavity convex rib graded demolding mold, the fixed mold group comprises a fixed mold insert and a sprue bush, the sprue bush and a fixed mold core B are fixedly embedded and installed in a step through hole of the fixed mold insert, and the fixed mold core A is fixedly embedded and installed in the fixed mold core B through hole; the movable mold group comprises a push plate, the movable mold core A is arranged in the movable mold core B, and the movable mold core B is arranged in a through hole in the push plate; after the part is injection moulding in the die cavity, the cover half separates earlier, make the runner cover, the cover half mold insert upwards separates with the push pedal, then movable mould core B breaks away from the annular of part earlier, make the protruding muscle that hugs closely with movable mould core A on the part obtain the space that expands a little, then when movable mould core A separates with the part, the deflection of protruding muscle obtains the deformation space that expands a little in the annular, make part and movable mould core A do not have protruding muscle wearing and tearing separation, the problem that the protruding muscle of forced drawing of patterns takes place to step on the angle has been solved, thereby the performance of product part has been guaranteed.

Description

Mould for demolding convex ribs in inner cavity of double-wall plastic compression piece in multiple times

Technical Field

The utility model belongs to the injection mold field relates to a mould is demoulded in grades to protruding muscle in casting die inner chamber is moulded to double-wall.

Background

The button cap is a functional part of the button switch, as shown in fig. 6 to 7, the button cap is made of polyformaldehyde, and because the button cap is of a double-wall structure, the inner wall of the button cap is provided with a semicircular convex rib, and the convex height of the convex rib is 0.25mm, the button cap is difficult to form and demould in production; the original mould structure does: the mould adopts two die structure of parting surface, and the part shaping is on the cover half, and inner chamber shaping mold insert designs into integral structure and fixes on the movable mould board, and after the mould die sinking, the part is stayed on the movable mould under the effect of protruding muscle and cohesion, releases the movable mould core with the part by the push pedal, because the protruding muscle of forced demoulding, so protruding muscle takes place easily and steps on the angle to influence the performance of product part.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a mould for demoulding the double-layer wall mould pressing piece inner cavity convex rib in a grading way.

The utility model discloses a following technical scheme can realize.

The utility model provides a pair of protruding muscle of casting die inner chamber is moulded to double-wall divides drawing of patterns mould, wherein, include: the fixed die set comprises a fixed die insert and a sprue bush, the sprue bush and the fixed die core B are fixedly embedded in a step through hole of the fixed die insert, and the fixed die core A is fixedly embedded in a through hole of the fixed die core B;

the movable die set comprises a push plate, a die core fixing plate and a movable die plate, wherein the movable die core A is arranged in the die core fixing plate, and the movable die core B is arranged in the movable die plate;

and a water path is arranged on the closed contact surface of the fixed die insert and the push plate and is communicated with a cavity of a part formed by the movable die core A, the movable die core B, the fixed die core A and the fixed die core B.

After the part is injection moulding in the die cavity, the cover half separates earlier, make the runner cover, the cover half mold insert upwards separates with the push pedal, then movable mould core B breaks away from the annular of part earlier, make the protruding muscle that hugs closely with movable mould core A on the part obtain the space that expands a little, then when movable mould core A separates with the part, the deflection of protruding muscle obtains the deformation space that expands a little in the annular, make part and movable mould core A do not have protruding muscle wearing and tearing separation, the problem that the protruding muscle of forced drawing of patterns takes place to step on the angle has been solved, thereby the performance of product part has been guaranteed.

The fixed die set also comprises a positioning ring, a fixed die base plate, a fixed die plate and a fixed die insert base plate, wherein the fixed die insert is embedded and installed in the fixed die plate; the fixed die insert backing plate is embedded in the fixed die plate and is positioned above the fixed die insert; the bottom of the fixed mold insert base plate tightly presses the top surfaces of the fixed mold core A and the fixed mold core B; the fixed die base plate is fixedly connected with the fixed die plate, and the positioning ring is fixedly connected with the fixed die base plate; the sprue bush is arranged in the through holes of the positioning ring, the fixed die base plate, the fixed die insert base plate and the fixed die insert in a penetrating and embedding manner.

The fixed die base plate is fixedly connected with the fixed die plate through screws.

The positioning ring is fixedly connected with the fixed die base plate through a screw.

The fixed die insert base plate is fixedly connected with the fixed die insert through a screw.

The movable module also comprises a core fixing plate and a core fixing plate base plate, the core fixing plate is fixedly connected with the core fixing plate base plate, and the push plate is positioned on the top surface of the core fixing plate;

the movable mould plate, the middle base plate, the cushion seat and the movable mould seat plate are fixedly connected in sequence from top to bottom;

through holes are arranged on the push plate, the core fixing plate and the core fixing plate base plate, and the movable template is provided with a step hole; one end of the movable mold core B is embedded and fixed on the step hole of the movable mold plate, and the other end of the movable mold core B penetrates through holes in the push plate, the mold core fixing plate and the mold core fixing plate base plate; the movable mold core A and the through hole on the push plate can slide relatively;

the limiting screw penetrates through the middle base plate, the core fixing plate base plate and the movable template in sequence at intervals and then is screwed with the core fixing plate, the large end of the limiting screw can move up and down in the step hole of the middle base plate, the limiting screw penetrates through the core fixing plate base plate and the outer diameter of the movable template and is sleeved with a push-out spring, and two ends of the push-out spring are limited by the core fixing plate and the middle base plate; the limiting screw and the push-out spring are combined to play a role in separating and controlling the distance between the core fixing plate and the movable template;

the large end of the reverse push rod is limited in a step hole of the ejector rod fixing plate, the small end of the reverse push rod penetrates through the core fixing plate, the core fixing plate padding plate, the movable template and the middle padding plate and then contacts with the bottom surface of the push plate, and two ends of a pushing spring sleeved on the reverse push rod are limited by the top surface of the ejector rod fixing plate and the hole surface of the middle padding plate; the ejector rod fixing plate is fixedly connected with the ejector rod base plate and is positioned in the hollow hole of the base seat to be contacted with the moving die base plate; the middle part of the movable mould seat plate is provided with a through hole corresponding to the ejector rod base plate;

an auxiliary pushing spring is further installed between the middle base plate and the ejector rod fixing plate, and two ends of the auxiliary pushing spring are in contact with the bottom surface of the middle base plate and the top surface of the ejector rod fixing plate; the auxiliary pushing springs and the pushing springs are symmetrically distributed on the ejector rod fixing plate at intervals.

The fixed die set further comprises a guide pillar, the large end of the guide pillar is limited and embedded and fixed in a step hole of the movable die plate, and the small end of the guide pillar sequentially penetrates through a core fixing plate base plate, a core fixing plate, a push plate and a guide sleeve embedded and fixedly installed in the step hole of the fixed die plate from bottom to top, so that guidance is provided for die opening and die closing of the fixed die set and the movable die set; the guide post is positioned on the movable mould plate at the other side of the movable mould core B.

The movable mould plate, the middle base plate, the cushion seat and the movable mould seat plate are fixedly connected through connecting screws.

The core fixing plate is fixedly connected with the core fixing plate base plate through screws.

The pad seat is fixedly connected with the movable die base plate through screws.

The middle base plate is fixedly arranged on the upper portion of the base plate, the middle base plate is fixedly arranged on the lower portion of the base plate, and the middle base plate is fixedly arranged on the lower portion of the base plate.

The beneficial effects of the utility model reside in that: the fixed die plate and the push plate are separated, the part is separated from the fixed die set, and meanwhile, the movable die core B is separated from the annular groove of the part under the action of the limiting screw and the push-out spring, so that a convex rib tightly attached to the movable die core A on the part obtains a micro-expansion space, and the convex rib is convenient to demould;

after the die is completely opened, the inner cavity of the part and the convex ribs wrap the movable die core A and remain on the push plate, at the moment, the ejection mechanism of the injection molding machine pushes the push plate to act on the push plate, and the reverse push rod fixed on the ejector rod fixing plate enables the push plate to push the inner cavity of the part and the convex ribs out of the movable die core A, so that the part is completely separated from the die; the part and the movable mold core A are separated without the abrasion of the convex rib, the problem that the angle is stepped by the forced demolding convex rib is solved, and the service performance of the product part is ensured.

Drawings

Fig. 1 is a schematic front sectional view of the present invention;

FIG. 2 is an enlarged schematic view at B of FIG. 1;

FIG. 3 is a schematic structural view of a moving mold core A of the present invention;

FIG. 4 is a schematic structural view of a moving mold core B of the present invention;

FIG. 5 is a schematic view of the fitting structure of the moving mold core A, the moving mold core B and the parts of the present invention;

FIG. 6 is a front sectional view of the parts;

fig. 7 is a partial schematic view of the section taken along line a-a in fig. 6.

In the figure: 1-a positioning ring; 2-fixing the mold base plate; 3-guide sleeve; 4-fixing a template; 5-guide pillar; 6-pushing the plate; 7-core fixing plate; 8-core fixing plate backing plate; 9-moving the template; 10-a middle base plate; 11-a shoe; 12-moving die base plate; 13-sprue bush; 14-fixed mold insert backing plate; 15-fixing the mold insert; 16-fixed mold core A; 17-fixing the mold core B; 18-moving mold core a; 19-moving core B; 20-a limit screw; 21-a limiting column; 22-a push-out spring; 23-a connection screw; 24-a counter-push rod; 25-ejector pin fixing plate; 26-ejector pin backing plate; 30-parts; 301-ring groove.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

See fig. 1-5.

The utility model discloses a mould is demoulded in grades to protruding muscle of casting die inner chamber is moulded to double-wall, wherein, include: the fixed die set comprises a fixed die insert 15 and a sprue bush 13, the sprue bush 13 and the fixed die core B17 are fixedly embedded in a step through hole of the fixed die insert 15, and the fixed die core A16 is fixedly embedded in a fixed die core B17 through hole;

the die comprises a movable die set, a movable die core A18 and a movable die core B19, wherein the movable die set comprises a push plate 6, a core fixing plate 7 and a movable die plate 9, the movable die core A18 is installed in the core fixing plate 7, and the movable die core B19 is installed in the movable die plate 9;

and a water path is arranged on the sealing contact surface of the fixed die insert 15 and the push plate 6, and the water path is communicated with a cavity formed by the movable die core A18, the movable die core B19, the fixed die core A16 and the fixed die core B17.

After the part 30 is injection-molded in the die cavity, the fixed die set separates firstly, make the runner cover 13, the fixed die mold insert 15 upwards separate with push pedal 6, then movable mould core B19 breaks away from the annular 301 of part 30 earlier, make the protruding muscle that hugs closely with movable mould core A18 on the part 30 obtain little expanded space, then movable mould core A18 when separating with part 30, the deflection of protruding muscle obtains little expanded deformation space in annular 301, make part 30 and movable mould core A18 not have protruding muscle wearing and tearing separation, the problem that the protruding muscle of forced demoulding takes place to step on the angle has been solved, thereby the performance of product part has been guaranteed.

The fixed die set also comprises a positioning ring 1, a fixed die base plate 2, a fixed die plate 4 and a fixed die insert backing plate 14, wherein a fixed die insert 15 is embedded in the fixed die plate 4; the fixed mold insert backing plate 14 is embedded in the fixed mold plate 4 and is positioned above the fixed mold insert 15; the bottom of the fixed mold insert backing plate 14 tightly presses the top surfaces of the fixed mold core A16 and the fixed mold core B17; the fixed die base plate 2 is fixedly connected with the fixed die plate 4, and the positioning ring 1 is fixedly connected with the fixed die base plate 2; the sprue bush 13 penetrates through and is embedded in through holes of the positioning ring 1, the fixed die base plate 2, the fixed die insert backing plate 14 and the fixed die insert 15.

The fixed die base plate 2 is fixedly connected with the fixed die plate 4 through screws.

The positioning ring 1 is fixedly connected with the fixed die base plate 2 through screws.

The fixed mold insert backing plate 14 is fixedly connected with the fixed mold insert 15 through screws.

The movable die set also comprises a core fixing plate 7 and a core fixing plate backing plate 8, wherein the core fixing plate 7 is fixedly connected with the core fixing plate backing plate 8, and the push plate 6 is positioned on the top surface of the core fixing plate 7;

the movable mould plate 9, the middle cushion plate 10, the cushion seat 11 and the movable mould seat plate 12 are fixedly connected in sequence from top to bottom;

through holes are arranged on the push plate 6, the core fixing plate 7 and the core fixing plate backing plate 8, and a step hole is arranged on the movable template 9; one end of the movable mold core B19 is embedded and fixed on the step hole of the movable mold plate 9, and the other end penetrates through the through holes on the push plate 6, the mold core fixing plate 7 and the mold core fixing plate backing plate 8; the movable mold core A18 and the through hole on the push plate 6 can slide relatively;

the limiting screw 20 penetrates through the middle base plate 10, the core fixing plate base plate 8 and the movable template 9 in sequence at intervals and then is screwed with the core fixing plate 7, the large end of the limiting screw 20 can move up and down in a stepped hole of the middle base plate 10, the limiting screw 20 penetrates through the outer diameters of the core fixing plate base plate 8 and the movable template 9 and is sleeved with a push-out spring 22, and two ends of the push-out spring 22 are limited by the core fixing plate 7 and the middle base plate 10; the limiting screw 20 and the push-out spring 22 are combined to play a role in separating and controlling the distance between the core fixing plate 7 and the movable template 9;

the core mold comprises a reverse push rod 24, a top rod fixing plate 25 and a top rod backing plate 26, wherein the large end of the reverse push rod 24 is limited in a step hole of the top rod fixing plate 25, the small end of the reverse push rod 24 penetrates through a core fixing plate 7, a core fixing plate backing plate 8, a movable mold plate 9 and a middle backing plate 10 and then contacts with the bottom surface of a push plate 6, and two ends of a pushing spring sleeved on the reverse push rod 24 are limited by the top surface of the top rod fixing plate 25 and the hole surface of the middle backing plate 10; the ejector rod fixing plate 25 is fixedly connected with the ejector rod base plate 26 and is positioned in the hollow hole of the base 11, and the ejector rod base plate 26 is contacted with the movable mould base plate 12; the middle part of the movable mold seat plate 12 is provided with a through hole corresponding to the ejector rod backing plate 26;

an auxiliary pushing spring is further arranged between the middle cushion plate 10 and the ejector rod fixing plate 25, and two ends of the auxiliary pushing spring are in contact with the bottom surface of the middle cushion plate 10 and the top surface of the ejector rod fixing plate 25; the auxiliary pushing springs and the pushing springs are symmetrically distributed on the ejector rod fixing plate 25 at intervals. The auxiliary pushing spring provides resetting buffer force for the movement between the bottom surface of the middle backing plate 10 and the ejector rod fixing plate 25.

The mould fixing device is characterized by further comprising a guide pillar 5, the fixed mould group further comprises a guide sleeve 3, the large end of the guide pillar 5 is limited and embedded and fixed in a step hole of the movable mould plate 9, and the small end of the guide pillar 5 sequentially penetrates through a core fixing plate base plate 8, a core fixing plate 7, a push plate 6 and the guide sleeve 3 embedded and fixedly installed in the step hole of the fixed mould plate 4 from bottom to top, so that guidance is provided for mould opening and mould closing of the fixed mould group and the movable mould group; the guide pillar 5 is located on the other side movable die plate 9 of the movable die core B19.

The movable mould plate 9, the middle cushion plate 10, the cushion seat 11 and the movable mould seat plate 12 are fixedly connected through a connecting screw 23.

The core fixing plate 7 is fixedly connected with the core fixing plate backing plate 8 through screws.

The pad seat 11 is fixedly connected with the moving die seat plate 12 through screws.

The middle base plate is characterized by further comprising a limiting column 21, wherein the limiting column 21 is fixedly installed on the middle base plate 10 and corresponds to the ejector rod fixing plate 25, and when the ejector rod fixing plate 25 moves upwards, the limiting column 21 limits the position.

The working principle is as follows: after the integral mold is installed on a horizontal injection molding machine and debugged, the mold is in a mold closing state at the moment, a valve is closed, a switch is started, a nozzle of the injection molding machine injects a molten material into a cavity of a part formed by the movable mold core A18, the movable mold core B19, the fixed mold core A16 and the fixed mold core B17 through the sprue bush 13, and the mold is opened under the action of a mold closing mechanism after pressure maintaining, cooling and solidification molding.

The mold opening process can be divided into two stages, namely a first stage: the fixed die plate 4 is separated from the push plate 6, the part 30 is separated from the fixed die set, meanwhile, the movable die core B19 is separated from the annular groove 301 of the part 30 under the action of the limiting screw 20 and the push-out spring 22, and at the moment, the convex rib tightly attached to the movable die core A18 on the part 30 obtains a micro-expansion space, so that the convex rib is convenient to demould;

and a second stage: after the die is completely opened, the inner cavity and the convex ribs of the part 30 wrap the movable die core A18 and remain on the push plate 6, at the moment, the ejection mechanism of the injection molding machine pushes the push plate 6 to act on the push plate 6, and the reverse push rod 24 fixed on the ejector rod fixing plate 25 enables the push plate 6 to push the inner cavity and the convex ribs of the part 30 out of the movable die core A18, and then the part 30 is completely separated from the die; the part 30 and the movable mould core A18 are separated without rib abrasion, the problem that the forced demoulding rib is stepped on the corner is solved, and the service performance of the product part is ensured.

Claims (10)

1. The utility model provides a mould is demoulded in grades to double-deck wall mould casting die inner chamber convex rib which characterized in that includes: the fixed die comprises a fixed die insert (15) and a sprue bush (13), the sprue bush (13) and the fixed die core B (17) are fixedly arranged in the fixed die insert (15), and the fixed die core A (16) is fixedly arranged on the fixed die core B (17);

the die comprises a movable die set, a movable die core A (18) and a movable die core B (19), wherein the movable die set comprises a push plate (6), a die core fixing plate (7) and a movable die plate (9), the movable die core A (18) is installed in the die core fixing plate (7), and the movable die core B (19) is installed in the movable die plate (9); and a water path is arranged on the closed contact surface of the fixed die insert (15) and the push plate (6), and the water path is communicated with a cavity of a part formed by the movable die core A (18), the movable die core B (19), the fixed die core A (16) and the fixed die core B (17).

2. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 1, wherein: the fixed die set further comprises a positioning ring (1), a fixed die base plate (2), a fixed die plate (4) and a fixed die insert backing plate (14), and the fixed die insert (15) is embedded in the fixed die plate (4); the fixed mold insert backing plate (14) is embedded in the fixed mold plate (4) and is positioned above the fixed mold insert (15); the bottom of the fixed mold insert backing plate (14) tightly presses the top surfaces of the fixed mold core A (16) and the fixed mold core B (17); the fixed die base plate (2) is fixedly connected with the fixed die plate (4), and the positioning ring (1) is fixedly connected with the fixed die base plate (2); the sprue bush (13) is arranged in the positioning ring (1), the fixed die base plate (2), the fixed die insert backing plate (14) and the fixed die insert (15).

3. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 2, wherein: the fixed die base plate (2) is fixedly connected with the fixed die plate (4) through screws; the fixed die insert backing plate (14) is fixedly connected with the fixed die insert (15) through screws.

4. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 2, wherein: the movable die set also comprises a core fixing plate (7) and a core fixing plate backing plate (8) which are fixedly connected with each other;

the movable mould comprises a movable mould plate (9), a middle cushion plate (10), a cushion seat (11), a movable mould base plate (12), a movable mould plate (9), a middle cushion plate (10), a cushion seat (11) and a movable mould base plate (12) which are fixedly connected in sequence;

one end of a movable mold core B (19) is fixedly connected with the movable mold plate (9), and the other end of the movable mold core B penetrates through the push plate (6), the mold core fixing plate (7) and the mold core fixing plate base plate (8); the movable mould core A (18) and the push plate (6) can slide relatively;

the limiting screw (20), the limiting screw (20) penetrates through the middle base plate (10), the core fixing plate base plate (8) and the movable template (9) in sequence at intervals and then is screwed with the core fixing plate (7), and the large end can move up and down in the step hole of the middle base plate (10);

the core mold comprises a reverse push rod (24), a push rod fixing plate (25) and a push rod base plate (26), wherein one end of the reverse push rod (24) is fixedly connected with the push rod fixing plate (25), the other end of the reverse push rod (24) penetrates through a core fixing plate (7), a core fixing plate base plate (8), a movable mold plate (9) and a middle base plate (10) in a clearance mode and then is contacted with the bottom surface of a push plate (6), a pushing spring is sleeved on the outer diameter of the reverse push rod (24), and the two ends of the reverse push rod are limited by the top surface of; the mandril fixing plate (25) is fixedly connected with the mandril base plate (26) and is positioned in the hollow hole of the base (11).

5. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 4, wherein: an auxiliary pushing spring is further installed between the middle base plate (10) and the ejector rod fixing plate (25).

6. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 4, wherein: the die set further comprises a guide post (5), the fixed die set further comprises a guide sleeve (3), one end of the guide post (5) is fixed on the movable die plate (9), and the other end of the guide post (5) penetrates through the guide sleeve (3) on the step hole of the core fixing plate base plate (8), the core fixing plate (7), the push plate (6) and the embedded fixed die plate (4).

7. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 4, wherein: the movable die plate (9), the middle cushion plate (10), the cushion seat (11) and the movable die seat plate (12) are fixedly connected through a connecting screw (23).

8. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 4, wherein: the core fixing plate (7) is fixedly connected with the core fixing plate backing plate (8) through screws.

9. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 4, wherein: the cushion seat (11) is fixedly connected with the movable mold seat plate (12) through screws.

10. The mold for the progressive release of ribs from an interior cavity of a double-walled molded part of claim 4, wherein: the middle cushion plate is characterized by further comprising a limiting column (21), wherein the limiting column (21) is fixedly arranged on the middle cushion plate (10) and corresponds to the ejector rod fixing plate (25).

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