Reversed-buckle core-pulling structure in sliding block of die-casting die

Abstract

The utility model relates to the technical field of die-casting dies, in particular to a back-off core pulling structure in a sliding block of a die-casting die, which comprises a back-off core pulling device and a mold core connected to the end part of the back-off core pulling device, the limiting assembly comprises a sliding rod, a positioning sleeve and a limiting switch; the sliding rod is sleeved with the positioning sleeve; the limiting switch is located on the side edge of the positioning sleeve; a vertical plate is fixedly connected between one end of the sliding rod and the back-off core pulling device; the limit switch comprises a front inductive switch and a rear inductive switch, and the positioning sleeve can be in contact with contacts of the front inductive switch and the rear inductive switch. According to the scheme, the mold core can be accurately fed into the target position in the mold, and it is guaranteed that the size of a die-cast workpiece cavity is accurate and errorless; and the mold core can be pulled out of the formed workpiece in place and completely separated from a workpiece cavity without hindering taking out of the workpiece, so that the percent of pass and the machining efficiency of the die-casting process are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of die casting die, concretely is die casting die sliding block inner reverse buckle core pulling structure. BACKGROUND

[0002] High-pressure die casting process is a kind of efficient metal casting method, through high pressure, molten metal is rapidly injected into the mold cavity, so that molten metal rapidly cools and solidifies in the mold cavity, thereby casting the required structural parts, especially suitable for manufacturing complex shape, size precision has strict requirements of parts.

[0003] For some cavity more parts, for example, gearbox body, crankcase body etc. Metal parts, after completing in die casting, the core mold needs to be pulled out from the cavity of the workpiece by using the core pulling mechanism, so that the workpiece can be taken down, but because the cavity is not only many, the angle is also different, so that the direction of each core mold is different, therefore, it is usually necessary to set a core pulling mechanism for each core mold, such as prior art "oblique double hydraulic cylinder lateral core pulling mechanism" (publication number: CN104070641B), two lateral core pulling structures are used to pull out the core in different directions. However, the prior art still has the following technical problems:

[0004] The core pulling structure of the prior art cannot accurately determine whether the position of the core is in place when moving, which can easily cause the core to not completely separate from the formed workpiece, resulting in the workpiece not being smoothly taken out, reducing the processing efficiency, or the core not entering the standard position, causing the size of the workpiece cavity after die casting to be wrong, reducing the processing qualification rate. INVENTION CONTENTS

[0005] The die casting die sliding block inner reverse buckle core pulling structure can solve the problem that the core pulling structure of the prior art cannot determine whether the moving position of the core is in place, which can easily cause the size of the formed workpiece to be wrong and hinder the workpiece from being smoothly taken down, resulting in reduced processing efficiency and processing qualification rate.

[0006] The application provides the following technical scheme: a die casting die sliding block inner reverse buckle core pulling structure, comprising a reverse buckle core pulling device and a core connected to the end of the reverse buckle core pulling device;

[0007] Further comprising a limiting assembly arranged below the reverse buckle core pulling device, the limiting assembly comprising a sliding rod, a positioning sleeve sleeved on the sliding rod, and a limiting switch located on the side of the positioning sleeve;One end of the sliding rod and the reverse buckle core pulling device are fixedly connected with a vertical plate;

[0008] The limiting switch comprises a front sensing switch and a rear sensing switch, and the positioning sleeve can contact the contacts of the front sensing switch and the rear sensing switch.

[0009] Beneficial effects:

[0010] Improve the qualification rate and processing efficiency of die casting. The vertical plate is used for connecting and fixing the undercut core puller and the sliding rod, so that the movement of the sliding rod can drive the movement of the undercut core puller. During the movement of the sliding rod, the positioning sleeve on the sliding rod contacts the contact of the front and rear inductive switches, so that the position of the sliding rod and the undercut core puller is inductively limited, so that the core can be accurately sent to the target position in the mold, and the size of the workpiece cavity after die casting is accurately ensured. The core can be separated from the workpiece after forming to the position, completely separated from the workpiece cavity, and will not hinder the taking out of the workpiece, thereby effectively improving the qualification rate and processing efficiency of the die casting process.

[0011] Further, the tail end of the undercut core puller is fixed with a short column, and a vertical plate is arranged between the short column and the sliding rod. The upper end of the vertical plate is fixed and locked with the short column by a nut, and the lower end of the vertical plate is fixed and locked with the end of the sliding rod by a nut.

[0012] Beneficial effect: the vertical plate is used for connecting the sliding rod and the intermediate part of the undercut core puller, which can play a transmission role. The nut locking mode can improve the disassembly convenience and facilitate the maintenance of the parts in the later period.

[0013] Further, the front and rear inductive switches are ball type travel switches.

[0014] Beneficial effect: the contact of the ball type travel switch is a rotatable ball structure, which can roll with the positioning sleeve on the sliding rod, has small friction and can reduce wear and tear, and improve the smoothness of contact induction.

[0015] Further, the outer part of the core is provided with a sliding block, and the core is slidably connected to the sliding block at an inclined angle. The tail part of the sliding block is fixedly connected with a sliding block core puller.

[0016] Beneficial effect: the sliding block is used as the main cavity mold of the workpiece during die casting, and the sliding block core puller is used to send the sliding block to the specified position before die casting, so as to ensure that the outer circle of the sliding block forms a main cavity after die casting, or drives the sliding block to separate from the formed workpiece to ensure that the formed workpiece is smoothly taken out.

[0017] Further, the sliding block core puller is further provided with a concave seat, and the front and rear inductive switches are fixed at the bottom of the concave seat.

[0018] Beneficial effect: the concave seat is used for fixing the sliding block core puller, and the front and rear inductive switches are fixed at the bottom of the concave seat, so as to improve the stability of the part connection. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the axonometric view of the utility model.

[0020] Figure 2 As Figure 1 The axial view after the slider is removed.

[0021] Figure 3 As Figure 1 The axial view after the base, concave seat and slider core puller are removed. DETAILED DESCRIPTION

[0022] The following will be further described in detail through specific embodiments:

[0023] The labels in the drawings of the specification include: base 1, mold core 101, workpiece 2, slider 3, core 4, core rod 41, undercut core puller 5, side piston rod 51, concave seat 6, slider core puller 7, main piston rod 71, limit rod 8, front inductive switch 9, short column 10, vertical plate 11, sliding rod 12, positioning sleeve 13, positioning block 14, rear inductive switch 15.

[0024] Example one

[0025] As Figures 1 to 3 shown, the mold core 101 is fixed in the middle of the base 1, and the workpiece 2 after die casting is located in the middle of the mold core 101.

[0026] The undercut core pulling structure in the die casting mold slider 3 includes the slider 3 slidingly connected to the base 1, the core 4 slidingly connected in the slider 3, the undercut core puller 5 connected to the tail of the core 4, the slider core puller 7 connected to the tail of the slider 3, and the limit assembly located below the undercut core puller 5. In this embodiment, the undercut core puller 5 and the slider core puller 7 are both hydraulic oil cylinders.

[0027] The concave seat 6 is fixed on the side wall of the base 1, and the slider core puller 7 is screw-fixed on the side wall of the concave seat 6. The end of the main piston rod 71 of the slider core puller 7 is fixedly connected with the tail of the slider 3, so that the slider core puller 7 can drive the slider 3 to move along the axial direction of the main piston rod 71. The end of the slider 3 close to the workpiece 2 extends into the mold core 101, which facilitates the formation of the main cavity of the workpiece 2 during die casting. The core 4 is slidingly connected in the slider 3 at an inclined angle, as Figure 2 shown, the end of the core 4 is also fixed with a core rod 41, which extends into the mold core 101, facilitating the formation of the hole type cavity of the workpiece 2 during die casting. The end of the core 4 away from the core rod 41 is fixed with the side piston rod 51 of the undercut core puller 5, so that the undercut core puller 5 can drive the core 4 and the core rod 41 to move along the axial direction of the side piston rod 51.

[0028] As Figure 3As shown, the limiting assembly is located below the undercut core puller 5, including a positioning block 14 fixed at the bottom of the concave seat 6, a sliding rod 12 slidingly connected to the positioning block 14, a positioning sleeve 13 sleeved on the sliding rod 12, and a limiting switch fixed at the side edge of the bottom of the concave seat 6. The limiting switch includes a front sensing switch 9 and a rear sensing switch 15, which are ball type travel switches; the contacts of the ball type travel switches are rotatable ball structures, which can rollingly contact the positioning sleeve 13 on the sliding rod 12, have small friction and can reduce wear and improve the smoothness of contact sensing. The tail end of the undercut core puller 5 is fixed with a short column 10, and a vertical plate 11 is fixedly connected between one end of the sliding rod 12 and the short column 10. The upper end of the vertical plate 11 is nut locked and fixed with the short column 10, and the lower end of the vertical plate 11 is nut locked and fixed with the end of the sliding rod 12. The end of the sliding rod 12 away from the vertical plate 11 can be externally connected to a driving mechanism to drive the entire sliding rod 12 to slide axially along the positioning block 14. The external driving mechanism can be a transmission structure such as an oil cylinder or an air cylinder.

[0029] A limiting rod 8 is also fixed at the tail of the sliding block 3, which is located at the opposite side of the undercut core puller 5. Another set of limiting switches is also fixed beside the limiting rod 8. The limiting switches at this position also include a front sensing switch 9 and a rear sensing switch 15 fixed at the bottom of the concave seat 6.

[0030] The use principle of the device is as follows:

[0031] After the die casting is completed, the undercut core puller 5 first drives the side piston rod 51 to retract into the undercut core puller 5, so that the core 4 and the core rod 41 slide off from the formed workpiece 2, and then the external driving mechanism drives the sliding rod 12 to slide backward, so that the entire undercut core puller 5 retreats into the concave space of the concave seat 6, and the core 4 and the core rod 41 are separated from the sliding block 3 to the outside, and the positioning sleeve 13 also moves from the position of the front sensing switch 9 to the position of the rear sensing switch 15, at which time it can be determined that the core 4 and the core rod 41 have been separated in place; then the sliding block core puller 7 drives the main piston rod 71 to retract into the sliding block core puller 7, so that the end of the sliding block 3 is separated from the main cavity of the formed workpiece 2, and the limiting rod 8 also moves from the position of the front sensing switch 9 below to the position of the rear sensing switch 15, at which time it can be determined that the sliding block 3 has been separated in place, at which time the mold can be opened to take out the workpiece 2. Figure 3 When the next die casting is needed, the sliding block 3 is first extended into the mold core 101 by the sliding block core puller 7, then the sliding rod 12 is driven forward by the external driving mechanism, the positioning sleeve 13 moves from the position of the rear sensing switch 15 to the position of the front sensing switch 9, and finally the core 4 and the core rod 41 are extended into the mold core 101 by the undercut core puller 5, and the next die casting can be started.

[0032] The above is only an embodiment of the present application, and the present application is not limited to the field of the embodiment, and the common knowledge such as specific structures and properties in the scheme is not described in detail herein. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of the claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. An undercut core puller structure in a die-casting mold slider includes an undercut core puller and a core connected to the end of the undercut core puller; the characteristics are: It also includes a limit assembly arranged below the undercut core puller, the limit assembly including a sliding rod, a positioning sleeve sleeved on the sliding rod, and a limit switch located on the side of the positioning sleeve; a vertical plate is fixedly connected between one end of the sliding rod and the undercut core puller; The limit switch comprises a front sensing switch and a rear sensing switch, and the positioning sleeve can contact the contacts of the front sensing switch and the rear sensing switch.

2. The die-casting mold slider undercut core pulling structure according to claim 1, characterized in that: A short column is fixed to the tail end of the inverted core puller, and a vertical plate is provided between the sliding rod and the short column. The upper end of the vertical plate and the short column are fixed by a nut, and the lower end of the vertical plate and the end of the sliding rod are fixed by a nut.

3. The undercut core pulling structure in the slider of the die-casting mold according to claim 2, characterized in that: The front sensing switch and the rear sensing switch are ball-type travel switches.

4. The die-casting mold slider undercut core pulling structure according to claim 3, characterized in that: A slider is provided on the outside of the core, and the core is slidably connected in the slider at an inclined angle, and a slider core puller is fixedly connected to the tail of the slider.

5. The undercut core pulling structure in the slider of the die-casting mold according to claim 4, characterized in that: The slider core puller is also provided with a concave seat, and the front sensing switch and the rear sensing switch are fixed on the bottom of the concave seat.

Images