Die structure for preventing end face of pipe fitting product from having offset

Abstract

The utility model relates to a die structure for preventing the end face of a pipe fitting product from offsetting. The die structure comprises a rear die holder, a rear die core, a sliding block and a baffle ring, a rear mold core groove is formed in the center of the rear mold base; the rear mold core is provided with a product cavity corresponding to the lower half part of the manufactured product in shape, and the rear mold core is mounted in a rear mold core groove of the rear mold base through a fastener; the sliding block is slidably arranged at the right end of the rear mold base. And the baffle ring is mounted on the rear mold core and is positioned between the product cavity of the rear mold core and the sliding block. According to the mold structure for preventing the end face of the pipe fitting product from having the offset, the manufactured product cannot tilt or deform.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a mold structure for preventing end faces of injection molded pipe products from having discontinuities. Background Art

[0002] At present, in the field of injection molding pipe fittings, during the injection molding process, after the injection molding machine closes the mold, the pouring system performs injection molding, and injects high-temperature and high-pressure molten materials, such as PPH, PVDF, PFA materials, etc., into the mold cavity. After the mold cavity is completely filled with liquid molten plastic, the injection molding machine begins to maintain the mold pressure so that the product density meets the quality requirements, and then the cooling system begins to cool the mold. The product is affected by the temperature drop, and it cools, shrinks, and solidifies. In this way, the product will be firmly wrapped on the round slider core. After the product is cooled and formed, the injection molding machine performs the mold opening action, and the slider core twitches. Due to the large product adhesion, the front mold and the rear mold have been separated and opened, and the rear mold and the product on the slider core are pulled by the slider, and the other end is tilted, resulting in a cross-sectional difference in the product, and the product quality does not meet the standard. The lathe, boring machine, and planer are required to perform secondary processing on the end face of the product, resulting in an increase in manufacturing costs. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a mold structure which can prevent the product from warping and deforming and prevent the end face of the pipe product from having a step difference.

[0004] The technical solution to achieve the purpose of the utility model is to provide a mold structure for preventing the end face of the pipe product from having a break, including a rear mold base, a rear mold core, a slider and a retaining ring;

[0005] The rear mold base opens upward and is provided with a rear mold core groove in the center; the rear mold core is provided with a product cavity corresponding to the shape of the lower half of the corresponding manufactured product, and the rear mold core is installed in the rear mold core groove of the rear mold base through fasteners; the slider is slidably arranged at the right end of the rear mold base; the retaining ring is installed on the rear mold core and is located between the product cavity of the rear mold core and the slider.

[0006] Furthermore, the ring surface on the product side of the retaining ring is set with a slope of 3-5°, and the upper half of the hole wall of the central through hole of the retaining ring is provided with a first exhaust groove that is evenly spaced and smaller on the left and larger on the right, and the left part of the lower half of the hole wall of the central through hole of the retaining ring is provided with a second exhaust groove that is evenly spaced and smaller on the left and larger on the right, the tail of the second exhaust groove is connected with the semi-annular third exhaust groove, and 3 to 6 fourth exhaust grooves are evenly spaced and connected to the right side of the third exhaust groove.

[0007] Furthermore, the exhaust depth of the exhaust groove of the retaining ring is 0.05-0.1 mm, the retaining ring is arranged at the rightmost end of the rear mold core, and the retaining ring is installed on the rear mold core by the lower half through the fastener.

[0008] Furthermore, the mold structure for preventing the end face of the pipe product from having a break also includes a slider guide, a cylinder, a cylinder fixing plate and a slider seat; the left and right ends of the rear mold seat are provided with semicircular mounting grooves, and the front and rear base plates of the rear mold seat are provided with positioning grooves and guide column holes for accurate positioning of the front and rear molds; the slider guide is semicircular, installed on the right end of the rear mold seat by fasteners and coaxial with the right end mounting groove of the rear mold seat; the cylinder fixing plate is provided with a U-shaped output shaft limiting groove opening upward, and the cylinder fixing plate is installed on the right end of the slider guide by fasteners; the slider seat is disc-shaped; the slider is ring-shaped; the slider is arranged at the leftmost end of the right side mounting groove of the rear mold seat, the slider seat is arranged on the right side of the slider, and the slider and the slider seat are connected together by fasteners; the cylinder is installed on the right end of the cylinder fixing plate by fasteners, and the power output shaft of the cylinder is connected to the slider seat in a left-right transmission connection.

[0009] Furthermore, the mold structure for preventing the end face of the pipe product from having a break also includes a fixed block and a pressure strip; the slider seat is provided with a water channel hole serving as a channel for the cooling water of the mold and symmetrically arranged front and rear machine holes for ensuring that the slider seat will not retreat to the right after the film is closed; the front and rear sides of the slider seat are centrally provided with first pressure strip positioning notches located on both sides of the pressure strip holes for preventing upward movement; the front and rear sides of the slider are centrally provided with second pressure strip positioning notches for preventing upward movement; the fixed block is disc-shaped, and the fixed block is connected to the center of the right end face of the slider seat through fasteners; the power output shaft of the cylinder passes through the output shaft limit groove of the cylinder fixing plate and is connected to the key groove of the fixed block; the pressure strip is installed on the upper end faces of the front and rear ends of the slider guide rail through fasteners, and is embedded in the corresponding first pressure strip positioning notches and second pressure strip positioning notches to limit the slider and the slider seat.

[0010] The utility model has positive effects: the utility model provides a mold structure for preventing the end face of a pipe fitting product from having a step difference. During the production process of the pipe fitting mold, the slider core pulls the product, the product will not warp or deform, the end face of the product has no step difference, and the end face does not need secondary processing, thereby improving production efficiency and reducing manufacturing costs.

[0011] In order to overcome the difference in the slide surface of the product, the end face of the product does not need secondary processing, saving the cost of secondary processing, a retaining ring is added at the rear mold parting surface of the slider's glue surface. The upper surface of the retaining ring's glue surface is against the front mold parting surface, and the lower part is buried under the rear mold glue position. The retaining ring is fixed on the rear mold. When the mold is opened, the slider is pulled, and the retaining ring does not move. The retaining ring just blocks the end face of the product. Even if the product has a large adhesion force, the product will not be lifted, and the end face of the product will not have a difference in the gap, so the end face of the product does not need secondary processing.

[0012] In addition, a slope of 3-5° is set at the mating part of the retaining ring, the sealing part is ground flat, and the depth of the exhaust groove on the retaining ring hole wall is set to 0.05-0.1 mm to facilitate product injection molding and avoid air entrapment and burning. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A structural schematic diagram (front view) of a mold structure for preventing the end face of a pipe product from having a step difference according to the utility model;

[0014] Figure 2 for Figure 1 A top view of

[0015] Figure 3 for Figure 2 AA surface section view;

[0016] Figure 4 It is a three-dimensional structural schematic diagram of a mold structure for preventing the end face of a pipe product from having a discontinuity in the utility model;

[0017] Figure 5 A three-dimensional structural schematic diagram of a retaining ring.

[0018] The markings in the above drawings are as follows: rear mold base 1, positioning groove 1-1, guide column hole 1-2, slider guide rail 2, fixed block 3, cylinder 4, cylinder fixing plate 5, rear mold core 6, slider seat 71, water channel hole 71-1, shovel hole 71-2, first bead positioning notch 71-3, slider 72, second bead positioning notch 72-1, retaining ring 8, first exhaust groove 8-1, second exhaust groove 8-2, third exhaust groove 8-3, fourth exhaust groove 8-4, bead 9, product 10. DETAILED DESCRIPTION

[0019] (Example 1)

[0020] See Figures 1 to 4 A mold structure for preventing the end face of a pipe product from having a break in this embodiment includes a rear mold base 1, a slider guide rail 2, a fixed block 3, a cylinder 4, a cylinder fixing plate 5, a rear mold core 6, a slider base 71, a slider 72, a retaining ring 8 and a pressure strip 9.

[0021] The rear mold base 1 is the main part of the mold. It is the main body that supports the rear mold core 6, the core and the slider 72, and is also the basic part of the mold. In production, after the product is molded, the injection molding machine generates a glue injection action, and the glue is formed at the glue position of the rear mold base 1 and the front mold. The rear mold base 1 opens upward, with a rear mold core groove in the center and semicircular mounting grooves at the left and right ends. The front and rear base plates of the rear mold base 1 are provided with positioning grooves 1-1 and guide column holes 1-2 for accurate positioning of the front and rear molds; the slider guide rail 2 is semicircular, installed on the right end of the rear mold base 1 by fasteners and coaxial with the right end mounting groove of the rear mold base 1; the cylinder fixing plate 5 is provided with a U-shaped output shaft limiting groove opening upward, and the cylinder fixing plate 5 is installed on the right end of the slider guide rail 2 by fasteners; the rear mold core 6 is provided with a product cavity corresponding to the shape of the lower half of the corresponding manufactured product 10, and the rear mold core 6 is installed in the rear mold core groove of the rear mold base 1 by fasteners; the slider seat 71 is disc-shaped, and is provided with a waterway hole 71-1 as a mold cooling water running channel and a waterway hole 71-1 used to ensure the slider seat 7 after the film is closed. 1 The shovel hole 71-2 is symmetrically arranged in front and back so as not to retreat to the right. The center of the front and back sides of the slider seat 71 is provided with a first pressure strip positioning notch 71-3 located on both sides of the shovel hole 71-2 to prevent upward movement; the slider 72 is annular, and the center of the front and back sides of the slider 72 is provided with a second pressure strip positioning notch 72-1 to prevent upward movement; the slider 72 is set at the leftmost end of the right side mounting groove of the rear mold seat 1, and the slider seat 71 is set on the right side of the retaining ring 8. The slider 72 and the slider seat 71 are connected together by fasteners. The fixed block 3 is disc-shaped, and the fixed block 3 is connected to the center of the right end face of the slider seat 71 through fasteners. The oil cylinder 4 is installed on the right end of the oil cylinder fixing plate 5 through fasteners. The power output shaft of the oil cylinder 4 passes through the output shaft limiting groove of the oil cylinder fixing plate 5 and is connected to the keyway of the fixed block 3. The pressure strip 9 is installed on the upper end faces of the front and back ends of the slider guide rail 2 through fasteners, and is embedded in the corresponding first pressure strip positioning notch 71-3 and second pressure strip positioning notch 72-1 to limit the slider 72 and the slider seat 71. See Figure 5 The left end ring surface of the retaining ring 8 is set with a slope of 3-5°, and the upper half of the hole wall of the central through hole of the retaining ring 8 is provided with a first exhaust groove 8-1 that is evenly spaced, smaller on the left and larger on the right, and the left part of the lower half of the hole wall of the central through hole of the retaining ring 8 is provided with a second exhaust groove 8-2 that is evenly spaced, smaller on the left and larger on the right, the tail of the second exhaust groove 8-2 is connected with the semi-annular third exhaust groove 8-3, and the right side of the third exhaust groove 8-3 is evenly spaced and connected with three fourth exhaust grooves 8-4, and the exhaust depth of each exhaust groove is 0.05-0.1 mm. The retaining ring 8 is set at the rightmost end of the rear mold core 6, and the retaining ring 8 is installed on the rear mold core 6 by fasteners from the lower half.

[0022] When a mold structure for preventing the end face of a pipe product from having a step difference is used in this embodiment, the front mold base, the rear mold base 1 and the slider base 71 are reset to the mold assembly state under the driving force of the injection molding clamping mechanism, and the injection molding machine continues to increase the clamping force to prepare for injection molding. When the injection molding machine nozzle completes the injection action and the melted rubber instantly fills the entire mold cavity, the cooling system starts to work under continuous pressure maintenance, the mold starts to cool down, and the product gradually solidifies from the melted state. After the product solidifies, the clamping force of the injection molding machine gradually decreases, and the injection molding machine is ready to open the mold. When the front and rear molds are driven by the injection molding machine's mold opening force, the front and rear molds are separated, and the product stays on the rear mold base 1 according to the requirements of the mold design, and the oil cylinder 4 starts to perform the core pulling action, and the oil cylinder 4 drives the slider base 71 and the slider core to move backward. The slider base 71 moves in the direction of the slider guide rail 2 under the fixation of the pressure strip 9. When the slider base 71 runs to a certain distance, there is a limiter with the oil cylinder fixing plate 5 to limit the movement stroke of the slider base 71. The slider seat 71 and the slider core are driven by the oil cylinder 4 to be pulled out from the product 10 to complete the core pulling action. When the core pulling action starts, since the slider core is tightly wrapped by the tubular product 10, the product 10 has a particularly large wrapping force, and the product 10 has to move to the right due to the inertia of the driving force of the oil cylinder 4. However, due to the design of the retaining ring 8, the retaining ring 8 is fixed on the rear mold core 6, completely blocking the side end face of the product 10, so that the end face of the product 10 will not be distorted and broken due to the influence of the slider wrapping force, so as to achieve the purpose of preventing the product 10 from breaking and deforming. The mold structure that prevents the end face of the pipe fitting product from breaking can also be applied to other pipe fitting project fields other than straight pipes, such as: 90° elbows, reducers, butt welding straight-throughs, special tees and other pipe fittings.

[0023] Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A mold structure for preventing end face discontinuity of pipe fittings, characterized by: Including rear die base, rear die core, slide block and retaining ring; The rear mold base opens upward and is provided with a rear mold core groove in the center; the rear mold core is provided with a product cavity corresponding to the shape of the lower half of the product to be manufactured, and the rear mold core is installed in the rear mold core groove of the rear mold base through fasteners; the slider is slidably arranged at the right end of the rear mold base; the retaining ring is installed on the rear mold core and is located between the product cavity of the rear mold core and the slider.

2. A mold structure for preventing end face discontinuity of a pipe fitting according to claim 1, characterized in that: The ring surface on the product side of the retaining ring is set with a slope of 3-5°, and the upper half of the wall of the central through hole of the retaining ring is provided with a first exhaust groove that is evenly spaced, smaller on the left and larger on the right. The left part of the lower half of the wall of the central through hole of the retaining ring is provided with a second exhaust groove that is evenly spaced, smaller on the left and larger on the right. The tail of the second exhaust groove is connected to the semi-annular third exhaust groove, and 3 to 6 fourth exhaust grooves are evenly spaced and connected to the right side of the third exhaust groove.

3. A mold structure for preventing end face discontinuity of a pipe fitting according to claim 2, characterized in that: The exhaust depth of the exhaust groove of the retaining ring is 0.05-0.1 mm. The retaining ring is set at the rightmost end of the rear mold core, and the retaining ring is installed on the rear mold core through fasteners from the lower half.

4. A mold structure for preventing end face discontinuity of a pipe fitting according to claim 1, characterized in that: It also includes a slider guide, a cylinder, a cylinder fixing plate and a slider seat; the left and right ends of the rear mold seat are provided with semicircular mounting grooves, and the front and rear base plates of the rear mold seat are provided with positioning grooves and guide column holes for accurate positioning of the front and rear molds; the slider guide is semicircular, installed on the right end of the rear mold seat by fasteners and coaxial with the right end mounting groove of the rear mold seat; the cylinder fixing plate is provided with a U-shaped output shaft limiting groove opening upward, and the cylinder fixing plate is installed on the right end of the slider guide by fasteners; the slider seat is disc-shaped; the slider is ring-shaped; the slider is arranged at the leftmost end of the right side mounting groove of the rear mold seat, the slider seat is arranged on the right side of the slider, and the slider and the slider seat are connected together by fasteners; the cylinder is installed on the right end of the cylinder fixing plate by fasteners, and the power output shaft of the cylinder is connected to the slider seat for left and right transmission.

5. A mold structure for preventing end face discontinuity of a pipe fitting according to claim 4, characterized in that: It also includes a fixed block and a pressure strip; the slider seat is provided with a water channel hole as a mold cooling water flow channel and shovel holes symmetrically arranged in the front and rear to ensure that the slider seat will not retreat to the right after the film is closed; the front and rear centers of the slider seat are provided with first pressure strip positioning notches located on both sides of the shovel hole to prevent upward movement; the front and rear centers of the slider are provided with second pressure strip positioning notches to prevent upward movement; the fixed block is disc-shaped, and the fixed block is connected to the center of the right end face of the slider seat through fasteners; the power output shaft of the cylinder passes through the output shaft limit groove of the cylinder fixing plate and is connected to the key groove of the fixed block; the pressure strip is installed on the upper end faces of the front and rear ends of the slider guide rail through fasteners, and is embedded in the corresponding first pressure strip positioning notch and second pressure strip positioning notch to limit the slider and the slider seat.

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