Rotary demolding mechanism

Abstract

The utility model relates to a rotary demolding mechanism. The rotary demolding mechanism comprises a rear mold core, a workpiece, a bearing and an ejector rod, a plurality of tooth grooves are evenly distributed in the inner wall of a cavity of the rear mold core in the circumferential direction. The bearing sleeve is arranged on the outer side of the rear mold core; the workpiece comprises a cylindrical tooth bone, a connecting part is arranged on the tooth bone, and first oblique teeth are arranged on the outer side surface of the connecting part; second oblique teeth are arranged on the surfaces of the outer sides of the tooth bones. The ejector rod drives the workpiece to axially move, so that the workpiece drives the rear mold core to rotate and is separated from the rear mold core along the tooth groove; the rotary demolding mechanism is ingenious in design, the ejector rod supports the rotary motion of the rear mold core, so that the rear mold core can be driven by a workpiece to rotate, friction between the rear mold core and an external mounting plate is reduced, rotation is smoother, the structure transmits rotating torque through helical tooth meshing, and through combination of bidirectional helical tooth guiding of the tooth bone, the demolding effect is improved. The demolding friction resistance is effectively eliminated, the product is prevented from being damaged by dragging, and the demolding device has the advantages of simple structure, high synchronism and low maintenance cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field more specifically, relate to a kind of rotary demolding mechanism. BACKGROUND

[0002] In the injection molding process of oblique tooth products (such as tooth bone, gear, etc.), due to the existence of oblique angle of tooth shape, sliding friction is easy to occur on the contact surface of oblique tooth of mold and product during demolding, which leads to tooth surface damage, hairiness and even fracture. The traditional demolding method usually uses forced ejection or increases the demolding slope, but the frictional resistance between oblique tooth and insert cavity is large, and the ejection force is too large to damage the product, affecting the appearance and quality of the product. SUMMARY

[0003] The utility model provides a rotary auxiliary mechanism for the demolding of oblique tooth products to solve the problem of oblique tooth damage by engaging the bearing with the oblique tooth to realize product ejection and rotary demolding.

[0004] The utility model discloses a rotary demolding mechanism, which comprises:

[0005] The rear mold core is a cylindrical structure, and a cavity for passing the workpiece is arranged in the middle part of the rear mold core.

[0006] A bearing is arranged on the outer side of the rear mold core. The outer ring of the bearing is fixedly connected with the external mounting plate, and the inner ring is in interference fit with the rear mold core.

[0007] The workpiece comprises a cylindrical tooth bone passing through the cavity, and a connecting part is arranged on the tooth bone. The outer side surface of the first end of the tooth bone is sequentially provided with a first oblique tooth inclined to the first direction. The outer side surface of the second end of the tooth bone is provided with a second oblique tooth inclined to the second direction. The first oblique tooth and the second oblique tooth can be engaged and driven with the tooth groove.

[0008] A ejector rod is arranged to drive the workpiece to move axially, so that the workpiece drives the rear mold core to rotate and separates from the rear mold core along the tooth groove.

[0009] The utility model discloses a rotary demolding mechanism, wherein the inclination angle of the tooth groove is equal to the inclination angle of the first oblique tooth.

[0010] The utility model discloses a rotary demolding mechanism, wherein the tooth groove extends along the width direction of the connecting part, and the inclination angle of the tooth groove is not less than 70°.

[0011] The utility model discloses a rotary demolding mechanism, wherein, the inclination direction of second bevel gear is opposite with the inclination direction of first bevel gear.

[0012] The utility model discloses a rotary demolding mechanism, wherein, 0.05-0.1mm's cooperation gap is equipped between the cavity inner wall and the connecting portion still.

[0013] The utility model discloses a rotary demolding mechanism, wherein, the bearing is ball bearing or roller bearing.

[0014] The utility model discloses a rotary demolding mechanism, wherein, the bearing is ball bearing or roller bearing. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the utility model will be further described below in conjunction with the drawings and embodiments, and the drawings in the following description are only part of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings:

[0016] Figure 1 The utility model discloses a rotary demolding mechanism's structure schematic Figure 1 ;

[0017] Figure 2 The utility model discloses a rotary demolding mechanism's structure schematic Figure 2 . DETAILED DESCRIPTION

[0018] The terms "first", "second", "third", and "fourth" and the like in the description and claims of the present application and the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. The terms "comprises", "comprising", "includes", "including" and the like are synonymous with the term "comprising", and are used in the sense of the process, method, system, product or apparatus comprising, containing or including an element, but not excluding others. For example, a process, method, system, product or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but can include additional or fewer steps or elements.

[0019] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a particular embodiment logically divided into parts. It is explicitly contemplated that embodiments described herein can be combined to include claims directed to combinations of the embodiments.

[0020] "Multiple" refers to two or more. "And / or", describing the relationship between the associated objects, means that there can be three relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. The character " / " generally represents that the front and rear associated objects are in an "or" relationship.

[0021] Furthermore, the terms "upper", "lower", "front", "back", "left", "right", "upper end", "lower end", "vertical", and the like indicating the orientation are all with reference to the attitude position of the device or equipment described in the scheme in normal use.

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0023] A rotating demolding mechanism of a preferred embodiment of the utility model, as shown in Figures 1-2 The rear die core 10 is a cylindrical structure, and a cavity 11 for passing the workpiece 20 is arranged in the middle part. A plurality of tooth grooves (not shown in the figure) are uniformly distributed on the inner wall of the cavity 11. The plurality of tooth grooves (not shown in the figure) are all inclined in the same direction.

[0024] The bearing 30 is sleeved on the outside of the rear die core 10. The outer ring of the bearing 30 is fixedly connected with the external mounting plate, and the inner ring is in interference fit with the rear die core 10. The use of the bearing reduces the direct contact between the rear die core and the fixing plate, reduces the wear, and thus prolongs the service life of the mold.

[0025] The workpiece 20 includes a cylindrical tooth bone 21 passing through the cavity 11, and a connecting part is arranged on the tooth bone. A first inclined tooth 22 inclined in a first direction is arranged on the outer surface of the first end of the tooth bone 21 in sequence in the circumferential direction. A second inclined tooth 23 inclined in a second direction is arranged on the outer surface of the second end of the tooth bone 21 in the circumferential direction. The first inclined tooth 22 and the second inclined tooth 23 can be engaged and transmitted with the tooth groove (not shown in the figure). The first inclined tooth and the second inclined tooth are respectively located at the two ends of the connecting part.

[0026] The ejector rod 40 drives the workpiece 20 to move axially, and the workpiece 20 drives the rear die core 10 to rotate and disengage from the rear die core 10 along the tooth groove (not shown in the figure). Compared with the traditional forced ejection, the rotating ejection can leave marks or damage on the surface of the workpiece, and the rotating ejection can better protect the surface of the workpiece and improve the appearance quality of the product due to the reduction of direct contact pressure.

[0027] The rotating ejection mechanism is designed ingeniously, the bearing fixing sleeve is arranged outside the rear die core to support the rotating movement of the rear die core, so that the rear die core can rotate under the driving of the workpiece, thereby reducing the friction between the rear die core and the external mounting plate, making the rotation more smooth, the tooth groove in the rear die core passage is engaged with the first and second inclined teeth of the workpiece in sequence, the rotating torque is transmitted by the inclined tooth engagement, the bidirectional rotation of the bearing is guided by the bidirectional inclined teeth of the tooth bone, the rear die core is driven to rotate with the bearing during ejection, the product is ejected and rotated at the same time, the product is prevented from being damaged, and the structure is simple, the synchronization is high, and the maintenance cost is low.

[0028] Further, the inclination angle of the tooth groove (not shown in the figure) is equal to the inclination angle of the first inclined tooth 22; the workpiece 20 can be accurately engaged in the cavity 11, so that the rotating ejection action is stable; due to the meshing action of the tooth groove and the inclined tooth, the tooth surface damage, pilling or fracture caused by uneven force during ejection can be effectively avoided.

[0029] Further, the tooth groove (not shown in the figure) extends along the width direction of the connecting part, and the inclination angle of the tooth groove (not shown in the figure) is not less than 70°, which can provide stronger ejection force, the force arm on each tooth is longer during rotation, thereby the ejection force can be transmitted more effectively; it is helpful to improve the ejection performance, reduce wear, enhance stability, and improve the overall production efficiency and product quality.

[0030] Alternatively, in another embodiment, the inclination direction of the second inclined tooth 23 is opposite to that of the first inclined tooth 22, forming a bidirectional rotation guide, which not only avoids the deflection of the workpiece during ejection, but also reduces the vibration and deviation of the mold, thereby improving the stability and precision of the ejection.

[0031] Further, a matching gap of 0.05-0.1mm is further provided between the inner wall of the cavity 11 and the connecting part, the appropriate matching gap not only makes the connecting part easier to be inserted into the cavity 11 during assembly, reduces the friction and resistance during assembly, but also prevents the inner wall of the cavity from interfering with the connecting part when the mold is closed or opened, ensuring smooth operation of the mold; and during mold operation, due to temperature changes, parts may expand due to heat, and the matching gap can absorb such expansion to prevent deformation or damage caused by heat expansion.

[0032] Alternatively, the bearing 30 is a ball bearing or a roller bearing in the prior art.

[0033] Specifically, the process is as follows:

[0034] Mold assembly: the rear die insert is installed on the inner ring of the bearing by interference fit, the outer ring of the bearing is fixed on the mold mounting plate, the tooth bone of the workpiece is inserted into the rear die insert cavity, and the first helical tooth of the connecting part is engaged with the tooth groove on the inner wall of the cavity.

[0035] Ejection demolding: after the mold is opened, the ejector rod pushes the workpiece to move axially along the cavity, the first helical tooth and the tooth groove are engaged to generate a rotating torque, which forces the rear die insert to rotate around the axis, and when the second helical tooth and the tooth groove are engaged to generate an opposite rotating torque, the guide bearing rotates in the direction until the workpiece is demolded from the rear die insert.

[0036] Reset: when the mold is closed, the ejector rod moves back, the rear die insert freely rotates to the initial position under the action of the bearing; the sequential demolding of the workpiece is realized, and the smoothness of the demolding process is ensured.

[0037] It should be understood that those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the utility model.

Claims

1. A rotary demolding mechanism, characterized in that, include: The rear mold core is a cylindrical structure with a cavity in the middle for the workpiece to pass through. Multiple toothed grooves are evenly distributed circumferentially on the inner wall of the cavity. A bearing is sleeved on the outside of the rear mold core; the outer ring of the bearing is fixedly connected to the external mounting plate, and the inner ring is interference-fitted with the rear mold core. The workpiece includes a cylindrical tooth bone that passes through the cavity, and the tooth bone is provided with a connecting part; the outer surface of the first end of the tooth bone is provided with a first oblique tooth inclined in a first direction in a circumferential direction; the outer surface of the second end of the tooth bone is provided with a second oblique tooth inclined in a second direction in a circumferential direction; both the first oblique tooth and the second oblique tooth can mesh with the tooth groove for transmission. The ejector pin drives the workpiece to move axially, causing the workpiece to rotate the rear mold core and disengage from the rear mold core along the tooth groove.

2. The rotary demolding mechanism according to claim 1, characterized in that, The inclination angle of the tooth groove is equal to the inclination angle of the first helical tooth.

3. The rotary demolding mechanism according to claim 1 or 2, characterized in that, The tooth groove extends along the width direction of the connecting portion, and the inclination angle of the tooth groove is not less than 70°.

4. The rotary demolding mechanism according to claim 1, characterized in that, The tilting direction of the second helical tooth is opposite to that of the first helical tooth.

5. The rotary demolding mechanism according to claim 1, characterized in that, A fitting gap of 0.05-0.1mm is also provided between the inner wall of the cavity and the connecting part.

6. The rotary demolding mechanism according to claim 5, characterized in that, The bearing is a ball bearing or a roller bearing.

Images