CN107364088B - Stop mechanism for preventing injection molding part from sticking to mold during core pulling back - Google Patents
Stop mechanism for preventing injection molding part from sticking to mold during core pulling back Download PDFInfo
- Publication number
- CN107364088B CN107364088B CN201710760319.8A CN201710760319A CN107364088B CN 107364088 B CN107364088 B CN 107364088B CN 201710760319 A CN201710760319 A CN 201710760319A CN 107364088 B CN107364088 B CN 107364088B
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- Prior art keywords
- core pulling
- core
- hole
- injection molding
- locking block
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
- B29C45/332—Mountings or guides therefor; Drives therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C2045/4063—Removing or ejecting moulded articles preventing damage to articles caused by the ejector
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to a retaining mechanism for preventing an injection molding piece from sticking to a mold when a core is pulled back, a core pulling slide block and a locking block are connected in a sliding way along a front-back high-back low inclined plane, a core rod and a pressing plate are horizontally arranged in the core pulling slide block, the core rod is a stepped shaft, a push rod part, a shoulder part and a retaining part are sequentially arranged from front to back, the radial dimension of the shoulder part is the largest, the retaining part penetrates through the pressing plate and is horizontally matched with the pressing plate in a sliding way, the front surface of the locking block comprises an upper inclined plane and a lower vertical plane, the vertical plane is concave in the inclined plane, in a mold clamping state, the core rod is supported between the core pulling slide block and the locking block through a pressure spring, the rear end surface of the pressing plate is in contact with the upper part of the front surface of the locking block, and the vertical rear end surface of the retaining part is in contact with the lower part of the front surface of the locking block. The invention solves the technical problem that the deformation of the core pulling position of the slender injection molding piece is difficult to control, thereby meeting the manufacturing and production requirements of high-quality injection molding.
Description
Technical Field
The invention relates to a stop mechanism for preventing an injection molding piece from sticking to a mold when a core is pulled back, which is particularly suitable for the core pulling design of a mold of an elongated injection molding piece.
Background
With the development of diversification of product shapes, more and more core-pulling cores are applied to the mold. For example, the application of slender light guides in car lamps is becoming more and more popular, the structure tends to be complicated, and the mold design needs to be matched with a core pulling structure to complete injection molding. However, when the traditional die moves, the packing force generated when the core is separated from the injection molding part is large, so that the product is often deformed, and especially for the slender injection molding part, if the packing force is too large, the injection molding part is possibly deformed or broken seriously, so that the traditional core-pulling structure is difficult to meet the injection molding precision requirement of the slender part. How to avoid the problem that the product precision is affected due to the deformation caused by core pulling during injection molding of the slender part is a technical problem to be solved.
Disclosure of Invention
In order to solve the problems, the invention provides the stopping mechanism for preventing the injection molding piece from sticking to the mold when the core is pulled back, and the mechanism can effectively control the position deformation of the slender injection molding piece during core pulling, so that the deformation is reduced or avoided, and the precision requirement is met.
The main technical scheme of the invention is as follows:
the retaining mechanism for preventing the injection molding piece from sticking to the mold during the back of the core pulling comprises a core rod, a pressure spring, a pressing plate, a wedge-shaped core pulling sliding block and a wedge-shaped locking block, wherein the core pulling sliding block and the locking block are connected in a sliding way along an inclined plane with a front high side and a rear low side, a horizontally extending stepped through hole is arranged in the core pulling sliding block, the stepped through hole is provided with a first stepped hole, a second stepped hole, a third stepped hole and a fourth stepped hole with radial sizes sequentially reduced from back to front, the pressing plate is fixedly arranged in the first stepped hole, the core rod is a stepped shaft, a push rod part, a shoulder part and a retaining part are sequentially arranged from front to back, the radial size of the shoulder part is maximum, the core rod is arranged in the stepped through hole, the retaining part penetrates through the pressing plate and is in horizontal sliding fit with the pressing plate, the push rod part penetrates through the third stepped hole and the fourth stepped hole, the rear end extends into the second stepped hole and is horizontally matched with the core pulling slide block in a sliding manner at the fourth stepped hole, the shoulder part is positioned in the second stepped hole, the pressure spring is arranged between an annular step surface between the third stepped hole and the fourth stepped hole and the front surface of the shoulder part, the radial dimension of the third stepped hole is smaller than that of the shoulder part, the rear end surface of the retaining part is a vertical plane, the front surface of the locking block comprises an upper inclined plane and a lower vertical plane, the vertical plane is concave in the inclined plane, a space is kept between the annular step surface between the second stepped hole and the third stepped hole and the front surface of the shoulder part in a die clamping state, the rear end surface of the shoulder part abuts against the front end surface of the pressing plate, the rear end face of the pressing plate is kept in contact with the upper portion of the front surface of the locking block, and the rear end face of the retaining portion is kept in contact with the lower portion of the front surface of the locking block.
Guide holes are respectively formed in the core pulling sliding block and the locking block, the inclined surfaces of the core pulling sliding block and the locking block are in sliding connection and guided by an inclined guide pillar, and the upper part and the lower part of the inclined guide pillar are respectively positioned in the guide holes in the locking block and the core pulling sliding block.
The inclined guide post is fixedly connected with the locking block, and the inclined guide post is in sliding connection with the guide hole of the core pulling slide block.
In the die closing state, the interval between the annular step surface between the second step hole and the third step hole and the front surface of the shoulder part is larger than the horizontal distance of the core pulling slide block when the injection molding piece is separated on the premise that the rear end surface of the retaining part is kept in contact with the lower part of the front surface of the locking block during die opening.
The cross section of the stepped through hole is circular, and the cross section of the core rod is also circular.
The fourth stepped hole is horizontally matched with the core pulling sliding block in a sliding mode only at the front portion.
Preferably, the interval d between the annular step surface between the second step hole and the third step hole and the front surface of the shoulder portion is greater than 1.5×s×cotβ, where S is the maximum height dimension of the right end surface of the retaining portion of the core rod, and β is the inclination angle of the inclined surface along which the core pulling slide block and the locking block are slidably connected with respect to the horizontal direction.
The beneficial effects of the invention are as follows:
the invention is equivalent to an integrated auxiliary ejection mechanism for preventing the injection molding piece from being stuck on the core-pulling sliding block, can prevent the injection molding piece from being seriously deformed or broken due to overlarge packing force generated when the core-pulling is separated from the injection molding piece, enables the injection molding piece to be smoothly ejected from the mold without deformation, realizes the protection of the injection molding piece, is beneficial to improving the precision of the injection molding piece, and is particularly suitable for slender injection molding pieces.
The invention innovates the design concept, solves the technical problem that the deformation of the core pulling position of the slender injection molding piece is difficult to control, and can meet the manufacturing and production requirements of high-quality injection molding. The mechanism increases the adaptability of the traditional die, so that the mechanism can cope with injection molding pieces of different shapes to meet the appearance requirements of future customers on products. Through the judgment of the effect after actual production, the invention has strong practicability and stable performance, and can be used for design and popularization.
The invention has simple structure, easy implementation and popularization and wide applicability.
Drawings
FIG. 1 is a schematic illustration of the appearance of a light guide injection molding for a vehicle lamp;
FIG. 2 is a schematic view of the core-pulling position of the plastic part shown in FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a schematic illustration of the relative position of the light guide injection molding of the vehicle lamp and the core rod of FIG. 1;
FIG. 5 is a schematic view of the structure of the present invention;
fig. 6 is a diagram of the core motion structure of the present invention.
Detailed Description
The invention discloses a stop mechanism (a stop mechanism for short) for preventing an injection molding part from sticking to a mold when a core is pulled back, which can avoid a mucous membrane of the injection molding part when the core is pulled back by opening the mold, so that the deformation of the injection molding part can be prevented, and the stop mechanism is particularly suitable for a mold of an elongated plastic part. The structure and operation of the retaining mechanism will be described below by taking an elongated lamp light guide injection molding 1 (i.e., an injection molding product, as shown in fig. 1) as an example. The demolding back-off condition exists at the position of the end part 11 of the car light guide injection molding part, so that a core pulling structure is required to be arranged. However, due to the slender characteristic of the injection molding piece, the product is easily severely deformed due to simple core pulling, so that the optical reflection surface is distorted, and the product effect is affected. The retaining mechanism is additionally arranged in the core pulling structure, and is particularly suitable for injection molding of slender products.
As shown in fig. 2 to 6, the retaining mechanism comprises a core rod 7, a pressure spring 2, a pressing plate 3, a wedge-shaped core-pulling sliding block 6 and a wedge-shaped locking block 4. The core pulling slide block and the locking block are connected in a sliding mode along an inclined plane with a front high inclination and a rear low inclination (the front and the rear correspond to the left and the right in the figure 6 respectively), a stepped through hole which extends horizontally is arranged in the core pulling slide block, and the stepped through hole is formed by a first stepped hole, a second stepped hole, a third stepped hole and a fourth stepped hole, wherein the sizes of the first stepped hole, the second stepped hole, the third stepped hole and the fourth stepped hole are sequentially reduced from back to front (perpendicular to the extending direction of the through hole). The pressing plate is fixedly arranged in the first stepped hole. The mandrel is a stepped shaft, which is provided with a push rod portion 71, a shoulder portion 72 and a stop portion 73 in this order from front to back, and the radial dimension of the shoulder portion is the largest. The core rod is installed in the stepped through hole, the retaining portion penetrates through the pressing plate and is in horizontal sliding fit with the pressing plate, the push rod portion penetrates through the third stepped hole and the fourth stepped hole, the rear end of the push rod portion extends into the second stepped hole, and the push rod portion is in horizontal sliding fit with the core pulling sliding block at the fourth stepped hole. The shoulder is located in the second stepped hole, the pressure spring is arranged between an annular stepped surface between the third stepped hole and the fourth stepped hole and the front surface of the shoulder, and the radial size of the third stepped hole is smaller than that of the shoulder.
The rear end face of the retaining part is a vertical plane, and the front surface of the locking block comprises an upper inclined plane a and a lower vertical plane b, wherein the vertical plane is concave (namely, the surface is lower than the inclined plane).
In the die assembly state, an interval d is kept between the annular step surface between the second step hole and the third step hole and the front surface of the shoulder part, the rear end surface of the shoulder part is abutted against the front end surface of the pressing plate, and the rear end surface of the pressing plate is also an inclined surface and is flush with the rear end surface of the core pulling sliding block. The rear end surface of the pressing plate is kept in contact with the upper part a of the front surface of the locking block, and the rear end surface of the retaining part is kept in contact with the lower part b of the front surface of the locking block.
The working principle of the invention is as follows: the locking block and the inclined guide pillar belong to fixed mold side parts, and the core-pulling sliding block and parts inside the core-pulling sliding block belong to movable mold side parts. The core-pulling slide block is usually arranged on the movable mould frame body and is pressed by a pressing plate, the core-pulling slide block can only slide between the pressing plate and the movable mould frame, and the core-pulling slide block can only move linearly left and right relative to the movable mould frame because the contact surfaces between the core-pulling slide block and the movable mould frame are in horizontal directions. The core rod has the main function of ensuring that the injection molding product is stationary at the moment of die opening, and the core rod resets under the action of the pressure spring and moves rightwards together with the core-pulling sliding block after the product is separated from the core-pulling sliding block.
When the die is opened, the locking block and the inclined guide pillar move upwards together, and the core pulling slide block moves horizontally to the right side under the action of the inclined guide pillar, but at the moment, the right end face of the core rod still keeps contact with the lower part b of the front surface of the locking block, so that the position of the core rod in the horizontal direction is not changed. In the initial stage of core pulling, the core pulling sliding block leaves the surface of the plastic part rightward, but the core rod still keeps a static state relative to the plastic part, so that the plastic part is prevented from sticking to the mold, and deformation of the plastic part is avoided. In this process, the interval d becomes smaller gradually, the compression spring is compressed under force, and the compression amount becomes larger and larger, and the front surface of the pressing plate becomes away from the right end surface of the shoulder portion gradually rightward. Until the distance of right movement of the core-pulling slide block is reached, the injection molding piece is completely separated from the core-pulling slide block, at the moment, the right end face of the stopping part is just in contact with the lower part of the front surface of the locking block, the blocking of the locking block is avoided, the core rod is rebounded and reset under the action of the pressure spring, and the relative position relationship between the core rod, the core-pulling slide block and the pressure plate is returned to the position relationship in the die assembly state. The pressing plate plays a role in guiding and limiting the core rod.
Guide holes are respectively formed in the core pulling sliding block and the locking block, the inclined surface sliding connection of the core pulling sliding block and the locking block is preferably guided by an inclined guide pillar 5, and the upper part and the lower part of the inclined guide pillar are respectively positioned in the locking block and the guide holes in the core pulling sliding block.
The inclined guide post can be fixedly connected with the locking block, and the inclined guide post is in sliding connection with a guide hole of the core pulling slide block.
In the die closing state, the distance d between the annular step surface between the second step hole and the third step hole and the front surface of the shoulder part is larger than the horizontal distance that the injection molding piece is separated from the core pulling slide block on the premise that the rear end surface of the retaining part is kept in contact with the lower part of the front surface of the locking block during die opening. For safety, a safety factor of 1.5 times can be set, so that interference in movement is avoided.
In order to ensure that the contact is changed from contact to non-contact at a suitable time, at least s×cotβ < d, more preferably 1.5×s×cotβ < d is satisfied, where S is the maximum height dimension of the right end face of the retaining portion of the core rod, β is the inclination angle of the inclined surface along which the core-pulling slide and the lock block are slidably connected with respect to the horizontal direction, and 1.5 is the above-mentioned safety factor, and other values greater than 1 may be adopted.
The cross-sectional shape of the stepped through hole is not limited, but is preferably circular from the viewpoint of manufacturability, and the cross-section of the core rod is correspondingly circular. Of course, the core rod can be rectangular or other shapes, and the core rod can be prevented from being circumferentially displaced during core pulling.
The fourth stepped hole can be horizontally matched with the core pulling sliding block in a sliding mode only at the front portion of the fourth stepped hole, compared with the whole hole section, the fourth stepped hole has matching requirements, machining difficulty is reduced, machining cost is saved, and machining accuracy is guaranteed easily.
As shown in fig. 2, two of the retaining mechanisms are preferably provided at one location of the injection molding to ensure mechanical balance.
Through the test die, the function and the appearance of the first product produced by the die adopting the retaining mechanism meet the requirements, and compared with the situation that various problems such as deformation exceeding standard and the like often occur when the first product is produced by the traditional die, the invention can obviously improve the qualification rate of injection molding products.
The invention refers to the relative positional relationship of the related structures, namely front and back, up and down, horizontal and vertical, and is not limited to the absolute orientation of the related structures.
Claims (5)
1. A stop mechanism for preventing injection molding parts from sticking to molds during core pulling back is characterized in that: the core pulling slide block is connected with the locking block in a sliding way along an inclined plane with high front and low rear, a horizontally extending stepped through hole is arranged in the core pulling slide block, the stepped through hole is provided with a first stepped hole, a second stepped hole, a third stepped hole and a fourth stepped hole with radial sizes being sequentially reduced from back to front, the pressing plate is fixedly arranged in the first stepped hole, the core rod is a stepped shaft, a push rod part, a shoulder part and a stopping part are sequentially arranged from front to back, the radial size of the shoulder part is the largest, the core rod is arranged in the stepped through hole, the stopping part penetrates through the pressing plate and is in horizontal sliding fit with the pressing plate, the push rod part penetrates through the third stepped hole and the fourth stepped hole, the rear end of the pressing rod part is in horizontal sliding fit with the core pulling slide block at the fourth stepped hole, the pressure spring is arranged in the second stepped hole, the pressure spring is arranged between the third stepped hole and the fourth stepped hole, the diameter of the pressing rod is in the radial direction of the shoulder part, the diameter of the pressing rod is in the plane between the annular shoulder part and the upper surface of the shoulder part, the stopping part is in the radial direction of the plane between the pressing plate and the lower surface of the shoulder part, the stopping part is in the radial direction of the pressing plate, the stopping part is in the plane between the vertical shoulder part and the upper surface of the pressing plate, the stopping part is in the vertical plane between the vertical plane, and the vertical plane between the top surface of the pressing plate is kept, and the vertical plane between the top surface and the stopping part is in the vertical plane and the vertical plane, the rear end surface of the retaining part is kept in contact with the lower part of the front surface of the locking block;
guide holes are respectively formed in the core pulling sliding block and the locking block, the inclined surfaces of the core pulling sliding block and the locking block are in sliding connection and guided by an inclined guide pillar, and the upper part and the lower part of the inclined guide pillar are respectively positioned in the guide holes in the locking block and the core pulling sliding block; the inclined guide post is fixedly connected with the locking block, and the inclined guide post is in sliding connection with the guide hole of the core pulling slide block.
2. The retaining mechanism for preventing the injection molding piece from sticking to the mold during the back of the core pulling as set forth in claim 1, wherein: in the die closing state, the interval between the annular step surface between the second step hole and the third step hole and the front surface of the shoulder part is larger than the horizontal distance of the core pulling slide block when the injection molding piece is separated on the premise that the rear end surface of the retaining part is kept in contact with the lower part of the front surface of the locking block during die opening.
3. The retaining mechanism for preventing the injection molding piece from sticking to the mold during the back of the core pulling as set forth in claim 2, wherein: the cross section of the stepped through hole is circular, and the cross section of the core rod is also circular.
4. The retaining mechanism for preventing the injection molding piece from sticking to the mold during the back of the core pulling as set forth in claim 2, wherein: the fourth stepped hole is horizontally matched with the core pulling sliding block in a sliding mode only at the front portion.
5. The retaining mechanism for preventing the injection molding piece from sticking to the mold during the back of the core pulling as set forth in claim 2, wherein: the interval d between the annular step surface between the second step hole and the third step hole and the front surface of the shoulder part is more than 1.5 multiplied by S multiplied by cotβ, wherein S is the maximum height dimension of the right end surface of the stopping part of the core rod, and β is the inclination angle of the inclined surface along which the core pulling slide block and the locking block are in sliding connection relative to the horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710760319.8A CN107364088B (en) | 2017-08-30 | 2017-08-30 | Stop mechanism for preventing injection molding part from sticking to mold during core pulling back |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710760319.8A CN107364088B (en) | 2017-08-30 | 2017-08-30 | Stop mechanism for preventing injection molding part from sticking to mold during core pulling back |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107364088A CN107364088A (en) | 2017-11-21 |
| CN107364088B true CN107364088B (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710760319.8A Active CN107364088B (en) | 2017-08-30 | 2017-08-30 | Stop mechanism for preventing injection molding part from sticking to mold during core pulling back |
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| CN (1) | CN107364088B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102737B (en) * | 2019-05-31 | 2021-01-01 | 宁波鑫达模具制造有限公司 | Die casting die with structure for preventing loose core interference |
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|---|---|---|---|---|
| JP2004306295A (en) * | 2003-04-02 | 2004-11-04 | Gifu Die & Mold Eng Co Ltd | Molding die |
| CN102336003A (en) * | 2011-10-28 | 2012-02-01 | 青岛海尔模具有限公司 | Core pulling mechanism of mechanical locking oil cylinder of injection mold |
| CN104476735A (en) * | 2014-11-24 | 2015-04-01 | 深圳创维精密科技有限公司 | Side core-pulling mechanism and injection mould |
| CN204340123U (en) * | 2014-12-23 | 2015-05-20 | 英杰精密模塑股份有限公司 | Prevent the core-pulling mechanism retreated of loosing core |
| CN204622488U (en) * | 2015-02-09 | 2015-09-09 | 上海信羽电子科技有限公司 | The core-pulling mechanism of the side direction projection of injection mold |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7381051B2 (en) * | 2006-01-24 | 2008-06-03 | Cheng Uei Precision Industry Co., Ltd. | Core-pulling mechanism and injection mold with the same |
-
2017
- 2017-08-30 CN CN201710760319.8A patent/CN107364088B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004306295A (en) * | 2003-04-02 | 2004-11-04 | Gifu Die & Mold Eng Co Ltd | Molding die |
| CN102336003A (en) * | 2011-10-28 | 2012-02-01 | 青岛海尔模具有限公司 | Core pulling mechanism of mechanical locking oil cylinder of injection mold |
| CN104476735A (en) * | 2014-11-24 | 2015-04-01 | 深圳创维精密科技有限公司 | Side core-pulling mechanism and injection mould |
| CN204340123U (en) * | 2014-12-23 | 2015-05-20 | 英杰精密模塑股份有限公司 | Prevent the core-pulling mechanism retreated of loosing core |
| CN204622488U (en) * | 2015-02-09 | 2015-09-09 | 上海信羽电子科技有限公司 | The core-pulling mechanism of the side direction projection of injection mold |
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| Publication number | Publication date |
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| CN107364088A (en) | 2017-11-21 |
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Address after: 201821 No. 767, Yecheng Road, Shanghai, Jiading District Applicant after: HUAYU VISION TECHNOLOGY (SHANGHAI) Co.,Ltd. Address before: 201821 Yecheng Road, Jiading District, Jiading District, Jiading District, Shanghai Applicant before: SHANGHAI KOITO AUTOMOTIVE LAMP Co.,Ltd. |
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