CN113102728B

CN113102728B - Movable die assembly and die casting machine

Info

Publication number: CN113102728B
Application number: CN202110441190.0A
Authority: CN
Inventors: 刘相尚; 潘玲玲; 徐文静; 刘卓铭
Original assignee: Shenzhen Leadwell Technology Co Ltd
Current assignee: Shenzhen Leadwell Technology Co Ltd
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2022-03-11
Anticipated expiration: 2041-04-23
Also published as: CN113102728A

Abstract

The invention relates to a movable die assembly and a die casting machine, wherein the movable die assembly comprises: and the movable die bottom plate is provided with a first movable die end face and a second movable die end face which are arranged at intervals in the thickness direction of the movable die bottom plate, and the first movable die end face is used for installing a movable die. And the piston is arranged on the end surface of the second movable die. And the movable mold body is connected with the piston in a sliding mode, the piston is provided with a connecting end face connected with the second movable mold end face, and all the connecting end faces are covered by the orthographic projection of the movable mold on the second movable mold end face. The orthographic projection of the connecting end face driven mold on the movable mold bottom plate covers, so that the action line of the mold locking force passes through the movable mold, the movable mold bottom plate can be effectively prevented from bending deformation, the movable mold is always attached to the movable mold bottom plate, the movable mold is prevented from deforming under the pressure of an internal cavity, and the molding quality of a die-casting product is guaranteed.

Description

Movable die assembly and die casting machine

Technical Field

The invention relates to the technical field of die casting machines, in particular to a movable die assembly and a die casting machine comprising the movable die assembly.

Background

The die casting machine comprises a fixed die assembly and a movable die assembly, wherein the fixed die is fixed on the fixed die assembly, the movable die is fixed on the movable die assembly, after pressure is applied to the movable die assembly to enable the fixed die and the movable die to be matched, molten metal or alloy liquid can be injected into a cavity formed by the fixed die and the movable die, and a die casting product can be formed after the molten metal or the alloy liquid is cooled. However, in the conventional die-casting machine, during the process of die assembly, the die is deformed by the deformation of the movable die assembly, so that the die-casting product is bulged and the forming precision of the die-casting product is finally affected.

Disclosure of Invention

The invention solves a technical problem of how to improve the forming precision of die-casting products.

A moving die assembly comprising:

the movable die base plate is provided with a first movable die end face and a second movable die end face which are arranged at intervals in the thickness direction of the movable die base plate, and the first movable die end face is used for installing a movable die;

a piston provided on an end face of the second movable die, and

and the movable mold body is connected with the piston in a sliding mode, the piston is provided with a connecting end face connected with the second movable mold end face, and all the connecting end faces are covered by the orthographic projection of the movable mold on the second movable mold end face.

In one embodiment, a pressure chamber is formed on the surface of the movable mold body facing the movable mold base plate in a recessed manner, and the piston is slidably disposed in the pressure chamber.

In one embodiment, the movable mold body comprises a limiting convex ring located in the pressure cavity, the limiting convex ring is connected with the bottom wall surface of the pressure cavity and protrudes relative to the bottom wall surface, a liquid guide hole is further formed in the movable mold body, the piston can be abutted against the limiting convex ring and surrounds the movable mold body to form a buffer cavity communicated with the liquid guide hole, a sunken groove is formed in the surface, facing the movable mold bottom plate, of the limiting convex ring, and the sunken groove can communicate the buffer cavity with the part, located outside the buffer cavity, of the pressure cavity.

In one embodiment, the piston has a top surface facing away from the end surface of the second movable mold, and the piston includes a pressing convex ring connected to the top surface and protruding relative to the top surface, and the pressing convex ring abuts against the limiting convex ring to jointly enclose the buffer cavity.

In one embodiment, the piston includes a sliding part and a plurality of legs, the sliding part is slidably connected to the movable mold body, the number of the legs is plural, the legs are arranged at intervals along the circumferential direction of the sliding part, the connecting end surface is located on the legs, the sliding part has a bottom surface facing the second movable mold end surface, the legs are connected to the bottom surface and protrude from the bottom surface, and a cavity is formed in the bottom surface in a recessed manner.

In one embodiment, the movable mold body comprises a body part and a plurality of radiation parts, the body part is slidably connected with the piston, the number of the radiation parts is multiple, the radiation parts extend along the axial direction perpendicular to the body part and are arranged at intervals along the circumferential direction of the body part, movable mold mounting holes for mounting rods to penetrate through are formed in the radiation parts and the movable mold bottom plate, and counter bores are formed in the connection positions of the body part and the radiation parts.

In one embodiment, the device further comprises a resetting piece for resetting the piston, and the resetting piece is connected between the second movable die end surface and the movable die body.

In one embodiment, the piston further comprises a support ring, and the support ring is connected with the movable mold body and can be sleeved on the piston.

In one embodiment, the movable mold base plate comprises a movable mold base plate made of steel material.

In one embodiment, a die casting machine comprises the movable die assembly of any one of the above.

One technical effect of one embodiment of the invention is that: the orthographic projection of the connecting end face driven mold on the movable mold bottom plate covers, so that the mold locking force acting on the edge of the movable mold bottom plate deviates a certain distance towards the middle of the movable mold bottom plate, the action line of the mold locking force passes through the movable mold, the movable mold bottom plate can be effectively prevented from bending deformation, the movable mold is ensured to be always attached to the movable mold bottom plate, and the movable mold bottom plate is ensured to always effectively provide stable and reliable support for the movable mold. So prevent that the moving die utensil from producing under the pressure of inside die cavity and warp, avoid the bulging defect to appear in the die-casting product after the shaping to guarantee the size precision of die-casting product in order to improve the shaping quality of self. Simultaneously, the movable mould is laminated with the movable mould bottom plate all the time for the contact stress evenly distributed of movable mould and movable mould bottom plate is on the movable mould bottom plate, prevents that the movable mould bottom plate from producing because of local stress concentration and caves in, and then improves the life of whole movable mould subassembly.

Drawings

FIG. 1 is a schematic perspective view of a die casting machine with a multiple shot assembly according to one embodiment;

FIG. 2 is a schematic perspective view of a die casting machine with a single shot assembly according to one embodiment;

FIG. 3 is a schematic view of a portion of the die casting machine of FIG. 2 with the single shot assembly removed;

FIG. 4 is a schematic plan view of the die casting machine of FIG. 2;

FIG. 5 is a schematic perspective view of a stationary die assembly of the die casting machine shown in FIG. 2;

FIG. 6 is an exploded schematic view of the stationary mold assembly shown in FIG. 5;

FIG. 7 is a schematic cross-sectional perspective view of the stationary mold assembly shown in FIG. 5;

FIG. 8 is a schematic perspective view of the stationary die body of the stationary die assembly shown in FIG. 5;

FIG. 9 is a schematic side elevational view of the stationary mold assembly illustrated in FIG. 5;

FIG. 10 is a schematic view of deformation of a conventional stationary mold assembly when a clamping force is applied;

FIG. 11 is a schematic cross-sectional view of the stationary mold assembly of FIG. 5 under clamping force;

FIG. 12 is a schematic perspective view of a movable die assembly of the die casting machine of FIG. 2;

FIG. 13 is a perspective sectional view of the movable die assembly of FIG. 12;

FIG. 14 is an exploded view of the movable die assembly of FIG. 12;

FIG. 15 is a schematic cross-sectional perspective view of FIG. 14;

FIG. 16 is a schematic view of the structure of FIG. 14 from another perspective;

FIG. 17 is a schematic view showing deformation of a conventional movable mold assembly when a clamping force is applied thereto;

FIG. 18 is a schematic sectional view showing the movable mold assembly shown in FIG. 12 when a clamping force is applied thereto.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Referring to fig. 1, 2, 3 and 4, a die casting machine 10 according to an embodiment of the present invention includes a stationary die assembly 11, a movable die assembly 12, a frame 13, a mounting rod 14, a single shot assembly 15, a multi-shot assembly 16, a driving assembly 17, a movable die bridge 19 and a slide block 20. The movable mold bridge 19, the movable mold bridge 19 and the sliding block 20 are all arranged on the rack 13 in a sliding mode, the sliding block 20 is fixed on the movable mold assembly 12, the driving assembly 17 is connected with the movable mold assembly 12, and when the driving assembly 17 applies acting force to the movable mold assembly 12, the movable mold assembly 12 can slide on the rack 13 in a reciprocating mode through the sliding block 20. The fixed mold assembly 11 may be fixedly disposed on the frame 13. The fixed mold bridge 18 is used for carrying the fixed mold 30 to slide relative to the frame 13 so as to facilitate the installation and the unloading of the fixed mold 30, and the movable mold bridge 19 is used for carrying the movable mold 40 to slide relative to the frame 13 so as to facilitate the installation and the unloading of the movable mold 40. The mounting rods 14 may be cylindrical straight rod-shaped structures, the number of the mounting rods 14 may be multiple, for example, the number of the mounting rods 14 may be four, and the mounting rods 14 are simultaneously inserted into the fixed mold assembly 11 and the movable mold assembly 12.

The fixed die 30 is fixed on the fixed die assembly 11, the movable die 40 is fixed on the movable die assembly 12, when the driving assembly 17 drives the movable die 40 to move close to the fixed die 30 until the fixed die 30 and the movable die 40 are closed, the fixed die 30 and the movable die 40 after being closed can be regarded as an integral die-casting die, and when metal or alloy melt is injected into a cavity of the die-casting die and filled, the melt can be solidified to form a die-casting product after being cooled.

Referring to fig. 5, 6 and 7, in some embodiments, the stationary mold assembly 11 includes a stationary mold body 100 and a stationary mold base plate 200. The fixed die base plate 200 can be made of steel materials, the steel materials can be P20 steel, and the fixed die base plate 200 made of the steel materials can be subjected to heat treatment, so that the hardness, the wear resistance and the rigidity of the whole fixed die base plate 200 are improved, and the fixed die base plate 200 is prevented from being deformed under the action of relatively small external force. The fixed die base plate 200 may have a substantially rectangular structure, and fixed die mounting holes 11b may be formed at four corners of the fixed die base plate 200, and the fixed die mounting holes 11b are used for penetrating the mounting rods 14.

The fixed mold base plate 200 has a first fixed mold end face 210 and a second fixed mold end face 220 facing opposite directions, the first fixed mold end face 210 and the second fixed mold end face 220 being disposed at an interval in a thickness direction of the fixed mold base plate 200, in short, the first fixed mold end face 210 and the second fixed mold end face 220 are both end faces in the thickness direction of the fixed mold base plate 200. The stationary mold 30 is fixed to the first stationary mold end surface 210, and the stationary mold body 100 is fixed to the second stationary mold end surface 220. A central injection hole 231 is formed at the center of the fixed mold base plate 200, and the central injection hole 231 penetrates through the fixed mold base plate

The bottom plate 200 may further have edge injection holes 232, the number of the edge injection holes 232 is one, for example, the number of the edge injection holes 232 may be two, the edge injection holes 232 simultaneously penetrate through the first fixed mold end face 210 and the second fixed mold end face 220, and the edge injection holes 232 are closer to the edge of the fixed mold bottom plate 200 than the central injection hole 231. The multi-injection assembly 16 can simultaneously inject the melt into the cavity of the die-casting mold through the edge injection holes 232, and the number of the edge injection holes 232 is multiple, so that the melt can be injected into the cavity from multiple different positions, the melt can be rapidly filled into the whole cavity, the influence on the molding quality of die-casting products due to the fact that the melt is not filled in part of the cavity is avoided, and the arrangement is particularly favorable for improving the molding quality of the die-casting products with large volumes.

In some embodiments, the fixed mold body 100 is molded separately from the fixed mold base plate 200, the fixed mold body 100 may have a substantially plate-like structure, and the fixed mold body 100 may be molded by casting. The fixed mold body 100 comprises a central portion 110 and edge portions 120, the edge portions 120 are connected with the edges of the central portion 110, the number of the edge portions 120 can be multiple, for example, the number of the edge portions 120 can be four, and the edge portions 120 are uniformly arranged at intervals along the circumferential direction of the central portion 110. The edge portions 120 are radially distributed with respect to the center of symmetry of the central portion 110, and in a colloquial manner, the extension lines of the plurality of edge portions 120 may intersect at the center of symmetry of the central portion 110. The central portion 110 may be fixed to the stationary mold base plate 200 by means of bolts, but the central portion 110 may be fixed to the stationary mold base plate 200 by means of riveting, welding or clipping. The edge portion 120 may be fixed to the fixed mold base plate 200 by a bolt connection, however, an end of the edge portion 120 away from the central portion 110 does not abut against the second fixed mold end surface 220, so that an installation gap 11a exists between the end of the edge portion 120 away from the central portion 110 and the second fixed mold end surface 220, and the size of the installation gap 11a may be within 5 mm. The rim portion 120 is also formed with a fixed mold mounting hole 11b, and the fixed mold mounting hole 11b is also formed to receive the mounting rod 14, so that the mounting rod 14 is simultaneously formed in the fixed mold mounting holes 11b of the fixed mold body 100 and the fixed mold base plate 200.

Referring to fig. 10, if the fixed mold body 100 of the fixed mold assembly 11 and the fixed mold bottom plate 200 are integrally formed by casting or forging, due to the large volume of the fixed mold assembly 11 of the large die casting machine 10, the integral forming of the large volume of the fixed mold assembly 11 will affect the forming dimension of the fixed mold assembly 11, so that the formed fixed mold assembly 11 is difficult to meet the requirements of the relevant form and location tolerance, and finally, the forming precision and the forming quality of the fixed mold assembly 11 are affected. Meanwhile, more importantly, because the coverage area of the fixed mold 30 is smaller than that of the fixed mold base plate 200, the fixed mold 30 is only attached to the middle region of the first fixed mold end surface 210, and the edge region of the first fixed mold end surface 210 is not attached to the fixed mold 30, that is, the fixed mold 30 can only abut against the middle region of the first fixed mold end surface 210, and the fixed mold 30 cannot abut against the edge region of the first fixed mold end surface 210. After the fixed mold 30 and the movable mold 40 are closed to form the die casting mold, the die casting mold is pressed between the fixed mold assembly 11 and the movable mold assembly 12, and it is apparent that the directions of external forces (i.e., mold locking forces) acting on the fixed mold assembly 11 and the movable mold assembly 12 are opposite, so that both the fixed mold assembly 11 and the movable mold assembly 12 apply pressing forces on opposite sides of the die casting mold, respectively. Because the clamping force acting on the fixed die assembly 11 is mainly distributed at the edge of the fixed die assembly 11, the action line of the clamping force does not pass through the fixed die 30, and the fixed die assembly 11 can be equivalent to a simply supported beam under the action of the clamping force. At this time, the central portion of the fixed mold assembly 11 will move away from the fixed mold 30 to form a curved arch, the edge portion of the fixed mold assembly 11 will move toward the movable mold assembly 12, and the whole fixed mold assembly 11 will be curved into a crescent shape, so that the fixed mold 30 and the first fixed mold end surface 210 cannot be attached to form a gap, i.e. the first fixed mold end surface 210 cannot effectively support the fixed mold 30. Because greater pressure exists in the cavity of the die-casting die, under the condition that effective support is not formed on the fixed die 30, the fixed die 30 generates deformation capable of filling the gap, and finally the cavity is deformed to cause the bulging defect of the formed die-casting product, so that the forming precision of the die-casting product in size is reduced, and the forming quality of the die-casting product is finally influenced. Meanwhile, due to the bending deformation of the fixed mold assembly 11, the contact stress between the fixed mold assembly 11 and the fixed mold 30 is concentrated on the edge of the fixed mold assembly 11, so that the local pressure is increased, the fatigue life of the fixed mold assembly 11 is shortened, and finally the first fixed mold end surface 210 of the fixed mold assembly 11 is sunken, thereby affecting the subsequent normal use of the first fixed mold end surface 210.

Referring to fig. 5, 9 and 11, for the fixed mold assembly 11 of the above embodiment, the fixed mold body 100 and the fixed mold base plate 200 are formed in a split manner, and even for the fixed mold assembly 11 with a large volume, because the fixed mold body 100 and the fixed mold base plate 200 are separately processed, the volume of the fixed mold body 100 and the fixed mold base plate 200 which are separately processed is greatly reduced, and the form and position tolerance of the fixed mold body 100 and the fixed mold base plate 200 is ensured, so that the forming precision and the forming quality of the fixed mold body 100 and the fixed mold base plate 200 can be effectively improved. After the molded fixed die body 100 and the fixed die bottom plate 200 are connected through the bolts, the dimensional accuracy of the whole fixed die assembly 11 can be effectively ensured so as to improve the molding quality of the fixed die assembly.

Similarly, the fixed mold 30 is only attached to the middle region of the first fixed mold end surface 210, and the edge region of the first fixed mold end surface 210 is not attached to the fixed mold 30, i.e. the fixed mold 30 is only pressed against the middle region of the first fixed mold end surface 210, but the fixed mold 30 cannot be pressed against the edge region of the first fixed mold end surface 210, and the mold locking force on the whole fixed mold assembly 11 is mainly distributed on the edge portion 120 under the action, so the fixed mold body 100 can be equivalent to a simple supported beam. However, there is a mounting gap 11a between the end of the edge portion 120 away from the center portion 110 and the second fixed mold end surface 220, and the deformation of the edge portion 120 toward the movable mold assembly 12 due to the mold clamping force fills the mounting gap 11a, in other words, the mounting gap 11a effectively cancels the bending deformation of the edge portion 120, prevents the bending deformation of the edge portion 120 from being transmitted to the fixed mold base plate 200, and prevents the entire fixed mold base plate 200 from being warped due to the mold clamping force. So can effectively eliminate because of the warp deformation produces the space between first cover half terminal surface 210 and cover half 30, ensure that cover half 30 laminates mutually with the first cover half terminal surface 210 of cover half bottom plate 200 all the time, guarantee that cover half bottom plate 200 effectively provides reliable and stable support to cover half 30 all the time, prevent that cover half 30 from producing under the pressure of inside die cavity and warping, avoid the die-casting product after the shaping to appear the bulging defect, thereby guarantee the size precision of die-casting product in order to improve the shaping quality of self. Meanwhile, the first fixed die end surface 210 is always attached to the fixed die 30, so that the contact stress between the fixed die base plate 200 and the fixed die 30 is uniformly distributed on the first fixed die end surface 210, the first fixed die end surface 210 is prevented from sinking due to local stress concentration, and the service life of the whole fixed die assembly 11 is prolonged.

Moreover, the fixed die base plate 200 is made of steel materials and has high hardness and rigidity, the bending deformation resistance of the fixed die base plate 200 can be improved, and the fixed die base plate 200 is further prevented from deforming, so that the die cavity of the die-casting die is prevented from deforming to enable die-casting products to form bulging, and the forming quality of the die-casting products can be further improved.

In other embodiments, the fixed mold body 100 and the fixed mold base plate 200 may be integrally connected by casting, that is, the whole fixed mold assembly 11 is integrally formed, but when the fixed mold assembly 11 is integrally formed, the installation gap 11a must still be maintained.

In some embodiments, the mounting gap 11a increases in cross-sectional dimension in a direction away from the central portion 110. Since the deformation generated at the end of the edge portion 120 away from the center portion 110 is relatively large, the portion of the mounting gap 11a having a large cross-sectional dimension can be made to effectively cancel the large deformation generated at the edge portion 120, preventing the deformation of the end of the edge portion 120 from being transmitted to the fixed mold base plate 200.

Referring to fig. 7 and 8, in some embodiments, the cross-sectional dimension a of the stationary mold body 100 near the end thereof is greater than the cross-sectional dimension a of the middle portion of the stationary mold body 100 in the thickness direction of the stationary mold body 100, i.e., the end dimension of the stationary mold body 100 is greater than the middle dimension thereof, so that the stationary mold body 100 has a substantially H-shaped or hourglass-shaped cross-section. Through this setting, can alleviate the basis of cover half body 100 weight to a certain extent on guarantee that cover half body 100 has reasonable structural strength. The junction of the central portion 110 and the rim portion 120 may be open with a counterbore 11c, the counterbore 11c opening onto the surface of the fixed mold body 100 disposed toward the fixed mold base plate 200, it being understood that the counterbore 11c is formed by a depression of the surface of the fixed mold body 100 disposed toward the fixed mold base plate 200. By arranging the counter bore 11c, on one hand, stress concentration of the fixed die body 100 under the action of a clamping force can be avoided; on the other hand, the local over-thick molding defect of the fixed die body 100 in the casting process can be avoided. The shape of the counterbore 11c may be racetrack, circular, rectangular, oval, or the like.

The central portion 110 may have a substantially ring-shaped structure, that is, the central portion 110 is surrounded by a through hole 111, and the through hole 111 may have a shape of a racetrack, a circle, a rectangle, an ellipse, or the like. When the fixed mold body 100 is fixed on the fixed mold base plate 200, the through hole 111 is located in a region that covers the central injection hole 231, i.e., the through hole 111 and the central injection hole 231 are communicated with each other and are correspondingly arranged, and the single shot injection assembly 15 can be inserted into the through hole 111 to inject melt into the cavity of the die casting mold through the central injection hole 231. The edge injection hole 232 is located outside the coverage area of both the stationary mold body 100 and the through-hole 111, and the multi-injection module 16 can inject melt into the cavity of the die casting mold through the edge injection hole 232.

Referring to fig. 12, 13 and 14, in some embodiments, the movable die assembly 12 includes a movable die body 300, a movable die base plate 400 and a piston 500, the piston 500 being disposed between the movable die base plate 400 and the movable die body 300. The movable mold base plate 400 can be made of steel material, the steel material can be P20 steel, and the movable mold base plate 400 made of the steel material can be subjected to heat treatment, so that the hardness, the wear resistance and the rigidity of the whole movable mold base plate 400 are improved, and the movable mold base plate 400 is prevented from being deformed under the action of relatively small external force. The movable mold base plate 400 may have a substantially rectangular configuration, and movable mold mounting holes 12b may be opened at four corners of the movable mold base plate 400, the movable mold mounting holes 12b being provided for inserting the mounting rod 14 therethrough. The movable die base plate 400 has a first movable die end surface 410 and a second movable die end surface 420 facing opposite directions, the first movable die end surface 410 and the second movable die end surface 420 being disposed at an interval in the thickness direction of the movable die base plate 400, in short, the first movable die end surface 410 and the second movable die end surface 420 are both end surfaces in the thickness direction of the movable die base plate 400. The movable mold 40 is fixed to the first movable mold end face 410, and the piston 500 is fixed to the second movable mold end face 420.

Referring to fig. 15 and 16, in some embodiments, the movable mold body 300 includes a body portion 310 and a plurality of radiation portions 320, the radiation portions 320 are connected to an edge of the body portion 310, the number of the radiation portions 320 may be plural, and the plurality of radiation portions 320 extend in an axial direction perpendicular to the body portion 310 and are uniformly spaced along a circumferential direction of the body portion 310. For example, the number of the radiation portions 320 may be four, and the plurality of radiation portions 320 are arranged at regular intervals along the circumferential direction of the body portion 310. The radiating portions 320 are radially distributed with respect to the symmetric center of the main body portion 310, and in a popular way, the extension lines of the plurality of radiating portions 320 may intersect with the symmetric center of the main body portion 310. The radiation part 320 is opened with a movable die mounting hole 12b, and the movable die mounting hole 12b is used for penetrating the mounting rod 14.

The surface of the movable mold body 300 facing the movable mold base plate 400 is concavely formed with a pressure chamber 311, the piston 500 is slidably disposed in the pressure chamber 311, and the cross section of the pressure chamber 311 may be circular or the like. The movable mold body 300 further includes a stopper protrusion 330, the stopper protrusion 330 may be substantially annular, and the stopper protrusion 330 is connected to the bottom wall surface 311a of the pressure chamber 311. obviously, the bottom wall surface 311a is disposed toward the movable mold base plate 400 and defines part of the boundary of the pressure chamber 311, and the stopper protrusion 330 protrudes by a certain height with respect to the bottom wall surface 311 a. The stop collar 330 provides a reference position for the piston 500. When the piston 500 abuts against the limit protruding ring 330, the piston 500 and the limit protruding ring 330 may enclose to form a buffer chamber 12 a. The main body 310 of the movable mold body 300 is further provided with a fluid guide hole 312, the fluid guide hole 312 is communicated with the buffer chamber 12a, and after hydraulic oil is injected into the buffer chamber 12a through the fluid guide hole 312 by the hydraulic cylinder, the piston 500 can be pushed to move away from the bottom wall surface 311a of the pressure chamber 311 under the action of the hydraulic oil. When the piston 500 is abutted against the limit convex ring 330 and is reset, a certain amount of hydraulic oil still remains in the buffer cavity 12a, so that the hydraulic oil is prevented from being completely discharged from the whole pressure cavity 311, and the sensitivity of the subsequent piston 500 to the pressure response of the hydraulic oil can be improved. The surface of the limiting convex ring 330 facing the movable mold bottom plate 400 is concavely provided with a sunken groove 331, the sunken groove 331 can be communicated with the buffer cavity 12a and the part of the pressure cavity 311 outside the buffer cavity 12a, and through the communication effect of the sunken groove 331, the hydraulic oil in the buffer cavity 12a can be quickly diffused to other parts of the pressure cavity 311 through the sunken groove 331, so that the piston 500 is pushed by the hydraulic oil to quickly move, and the sensitivity of the piston 500 to the pressure response of the hydraulic oil can be improved.

The junction between the body portion 310 and the radiating portion 320 may be opened with a counter bore 12c, and the counter bore 12c may be opened on the surface of the movable mold body 300 disposed toward the movable mold base plate 400, or it may be understood that the counter bore 12c is formed by the surface of the movable mold body 300 disposed toward the movable mold base plate 400 being recessed. By arranging the counter bore 12c, on one hand, stress concentration of the movable mold body 300 under the action of a mold locking force can be avoided; on the other hand, the local over-thick forming defect of the movable mould body 300 in the casting process can be avoided. The shape of the counterbore 11c may be racetrack, circular, rectangular, oval, or the like.

In some embodiments, the piston 500 includes a sliding portion 510, a leg 520, and an abutment collar 530. The sliding portion 510 is slidably connected to the body portion 310 of the movable mold body 300, i.e., the sliding portion 510 is slidably disposed within the pressure chamber 311. The sliding part 510 has a top surface 512 and a bottom surface 513 facing opposite directions, the bottom surface 513 and the top surface 512 are substantially two end surfaces of the sliding part 510 spaced apart in the axial direction thereof, and the bottom surface 513 is provided facing the movable mold base plate 400. The legs 520 are connected to the edge of the bottom 513, the legs 520 protrude from the bottom 513 to a certain height, the middle portion of the bottom 513 is recessed toward the top 512 by a predetermined depth to form a cavity 511, the number of the legs 520 is plural, and the legs 520 surround the cavity 511 and are uniformly spaced along the circumference of the slider 510. The leg 520 has a connecting end surface 521, and the connecting end surface 521 is connected to the second movable mold end surface 420, for example, the connecting end surface 521 is directly attached to the second movable mold end surface 420. The legs 520 and the movable mold base plate 400 are connected separately, for example, they may be connected by bolts, or they may be connected by riveting, welding or clipping. In other embodiments, the legs 520 and the movable mold base 400 can be integrally formed.

The pressing protrusion ring 530 is connected to the top surface 512 of the sliding portion 510, and the pressing protrusion ring 530 protrudes a certain height relative to the top surface 512. When the piston 500 moves to the limit position near the bottom wall surface 311a of the pressure chamber 311, the pressing convex ring 530 abuts against the limit convex ring 330, so that the pressing convex ring 530 and the limit convex ring 330 together enclose the buffer chamber 12 a. By arranging the abutting convex ring 530, the volume of the buffer cavity 12a can be reasonably increased, so that the storage amount of hydraulic oil in the buffer cavity 12a is increased, and the sensitivity of the piston 500 to the pressure response of the hydraulic oil can be increased.

In some embodiments, the movable mold assembly 12 further includes a reset piece 12d and a support ring 12e, the reset piece 12d is connected between the second movable mold end face 420 and the movable mold body 300, the reset piece 12d may be an oil cylinder or the like, for example, a cylinder barrel of the oil cylinder may be fixed on the movable mold body 300, and an output rod of the oil cylinder is fixed on the movable mold base plate 400. Under the action of the oil cylinder, the piston 500 can be abutted against the limit convex ring 330 on the movable mold body 300, so that the piston 500 is reset again. The support ring 12e is adapted to the shape of the pressure chamber 311, for example, the support ring 12e may be a circular ring, the support ring 12e is fixed on the movable mold body 300, and the support ring 12e can be sleeved outside the piston 500, so that the support ring 12e can be pressed between the movable mold body 300 and the piston 500. By providing the supporting ring 12e, on the one hand, the supporting ring 12e has a sealing effect on the pressure chamber 311 to a certain extent, and prevents the hydraulic oil in the pressure chamber 311 from leaking; on the other hand, the support ring 12e may be made of a high wear-resistant material, so as to prevent the support ring 12e from being damaged by the friction force generated during the sliding process of the piston 500. The support ring 12e may be an integral connection structure or a split connection structure formed by splicing a plurality of arc-shaped segments. In other embodiments, the reset element 12d may also be a pneumatic cylinder or other electric actuator or the like.

When the movable mold 40 is mounted on the first movable mold end surface 410, the movable mold 40 has an orthographic projection on the second movable mold end surface 420 by which the connecting end surface 521 on the leg 520 of the piston 500 can be fully or partially covered. When the piston 500 applies the extrusion force (i.e., mold locking force) perpendicular to the movable mold base plate 400 after the connecting end surface 521 is completely covered by the orthographic projection, the extrusion force is the positive pressure (i.e., mold locking force) applied by the piston 500 on the movable mold base plate 400, and therefore, the action line of the positive pressure (i.e., mold locking force) passes through the movable mold 40 itself, and the action line of the positive pressure is effectively prevented from being located outside the movable mold 40.

Referring to fig. 17, if the movable mold assembly 12 is integrally formed by casting or forging, in view of the large size of the movable mold assembly 12 of the large-scale die casting machine 10, the large size of the movable mold assembly 12 is affected by the integral forming, so that the formed movable mold assembly 12 is difficult to meet the requirements of the relevant form and position tolerances, and the forming accuracy and the forming quality of the movable mold assembly 12 are affected finally. Meanwhile, more importantly, because the coverage area of the movable mold 40 is smaller than that of the movable mold base plate 400, the movable mold 40 is only attached to the middle area of the first movable mold end surface 410, the edge area of the first movable mold end surface 410 is not attached to the movable mold 40, that is, the movable mold 40 can only abut against the middle area of the first movable mold end surface 410, and the movable mold 40 cannot abut against the edge area of the first movable mold end surface 410. After the fixed mold 30 and the movable mold 40 are closed to form the die casting mold, the die casting mold is pressed between the fixed mold assembly 11 and the movable mold assembly 12, and it is apparent that the directions of the pressing forces (i.e., mold locking forces) acting on the fixed mold assembly 11 and the movable mold assembly 12 are opposite, so that both the fixed mold assembly 11 and the movable mold assembly 12 apply the pressing forces on opposite sides of the die casting mold, respectively. Because the clamping force acting on the movable mold component 12 is mainly distributed at the edge of the movable mold component 12, the action line of the clamping force does not pass through the movable mold 40, so that the movable mold component 12 can be equivalent to a simply supported beam under the action of the clamping force. At this time, the central portion of the movable mold component 12 moves away from the movable mold 40 to form a curved arch, the edge portion of the movable mold component 12 moves toward the fixed mold component 11, and the entire movable mold component 12 is curved in a crescent shape, so that the movable mold 40 cannot be attached to the first movable mold end surface 410 to form a gap, i.e., the first movable mold end surface 410 cannot effectively support the movable mold 40. Because greater pressure exists in the cavity of the die-casting die, under the condition that effective support is not formed on the movable die 40, the movable die 40 generates deformation capable of filling the gap, the cavity is deformed, and the formed die-casting product generates an expansion defect, so that the forming precision of the die-casting product in size is reduced, and the forming quality of the die-casting product is finally influenced. Meanwhile, as the movable mold component 12 is bent and deformed, the contact stress between the movable mold component 12 and the movable mold 40 is concentrated on the edge of the movable mold component 12, which increases the local pressure, so that the fatigue life of the movable mold component 12 is shortened, and finally, the faying surface of the movable mold component 12 corresponding to the movable mold 40 is sunken, which affects the subsequent normal use of the movable mold component 12.

Referring to fig. 16 and 18, for the movable mold assembly 12 of the above embodiment, the movable mold body 300, the movable mold base plate 400 and the piston 500 are formed separately, even for the movable mold assembly 12 with a large volume, because the movable mold body 300, the movable mold base plate 400 and the piston 500 are separately processed, the volumes of the movable mold body 300, the movable mold base plate 400 and the piston 500 which are separately processed are greatly reduced, the form and position tolerance of the movable mold body 300, the movable mold base plate 400 and the piston 500 is ensured, and thus the forming accuracy of the movable mold body 300, the movable mold base plate 400 and the piston 500 can be effectively improved. When the molded piston 500 is slidably disposed in the pressure chamber 311 of the movable mold body 300 and bolted to the movable mold bottom plate 400, the dimensional accuracy of the entire movable mold assembly 12 can be effectively ensured to improve the molding quality thereof.

Similarly, the movable mold 40 is only attached to the middle region of the first movable mold end surface 410, and the edge region of the first movable mold end surface 410 is not attached to the movable mold 40, i.e. the movable mold 40 is only pressed against the middle region of the first movable mold end surface 410, and the movable mold 40 cannot be pressed against the edge region of the first movable mold end surface 410. The movable mold assembly 12 of the above embodiment makes the mold clamping force vertically acting on the edge of the movable mold base plate 400 to deviate a certain distance toward the middle of the movable mold base plate 400 through the medium and the conversion effect of the piston 500, and then makes most of or even all of the action lines of the mold clamping force to pass through the movable mold 40, and at this time, the movable mold base plate 400 will not be equivalent to a simply supported beam any more through the supporting action of the movable mold 40. The event can prevent effectively that movable mould bottom plate 400 from producing bending deformation and forming the crescent, thereby effectively eliminate because of the warp deformation produces the space between first movable mould terminal surface 410 and movable mould 40, ensure that movable mould 40 laminates mutually with the first movable mould terminal surface 410 of movable mould bottom plate 400 all the time, guarantee that movable mould bottom plate 400 effectively provides reliable and stable support to movable mould 40 all the time, prevent that movable mould 40 from producing under the pressure of inside die cavity and warping, avoid the bulging defect to appear in the die-casting product after the shaping, thereby guarantee the size precision of die-casting product in order to improve self shaping quality. In addition, the movable mold base plate 400 is made of steel materials and has high hardness and rigidity, the bending deformation resistance of the movable mold base plate 400 is improved, and the movable mold base plate 400 can be further prevented from deforming, so that the die cavity of the die-casting mold is prevented from deforming to enable a die-casting product to form bulging, and the molding quality of the die-casting product can be further improved. Meanwhile, the first movable mold end face 410 is always attached to the movable mold 40, so that the contact stress between the movable mold base plate 400 and the movable mold 40 is uniformly distributed on the first movable mold end face 410, the first movable mold end face 410 is prevented from being sunken due to local stress concentration, and the service life of the whole movable mold assembly 12 is further prolonged.

Referring to fig. 3, in some embodiments, the driving assembly 17 includes a driving rod 171, a clamping sleeve 172 and a safety rod 173, the driving rod 171 may be driven by an oil cylinder, an end of the driving rod 171 is fixedly connected to the movable mold base plate 400, and when the oil cylinder drives the driving rod 171 to reciprocate, the movable mold base plate 400 may drive the movable mold 40 to move closer to or away from the fixed mold 30, so as to achieve closing or opening of the entire die casting mold. The ferrule 172 may be disposed on the driving rod 171, one end of the safety lever 173 may be fixedly connected to the movable mold base plate 400, and the other end of the safety lever 173 may be fixedly connected to the frame 13. The safety lever 173 is provided with a plurality of locking grooves 173a, and the locking grooves 173a are spaced apart from each other along the axial direction of the safety lever 173. When the ferrule 172 is fitted with the catching groove 173a, the driving rod 171 is effectively prevented from moving. Therefore, when the maintenance personnel maintain and maintain the working die-casting machine 10, the situation that the driving rod 171 drives the movable die bottom plate 400 to move due to misoperation can be avoided, the potential safety hazard caused by die opening when the movable die 40 is far away from the fixed die 30 is prevented, and the safety of the die-casting machine 10 is improved.

In some embodiments, the die casting machine 10 may further include an extraction cylinder 21, the extraction cylinder 21 being fixed to the frame 13, the extraction cylinder 21 being operable to extract the mounting bar 14 from the stationary die assembly 11 and the movable die assembly 12.

The operation and the operating principle of the die casting machine 10 are described below:

when the die-casting product needs to be produced, in the first step, the fixed die assembly 11 is fixed on the frame 13, the mounting rod 14 is inserted into the fixed die mounting hole 11b of the fixed die assembly 11, the mounting rod 14 is locked in the fixed die mounting hole 11b of the fixed die body 100 through the split nut 22, so that the mounting rod 14 is fixedly connected with the whole fixed die assembly 11, and then the fixed die 30 is fixed on the fixed die base plate 200. In the second step, the mounting rod 14 is inserted into the movable mold mounting hole 12b of the movable mold assembly 12, and the movable mold 40 is fixed to the movable mold base 400, and the driving assembly 17 drives the entire movable mold assembly 12 and the movable mold 40 to move close to the fixed mold 30. When the movable mold 40 is pressed against the fixed mold 30 to be closed, the mounting rod 14 is locked in the movable mold mounting hole 12b of the movable mold body 300 by the split nut 22. At this time, the stationary mold assembly 11, the movable mold body 300, and the installation rod 14 are fixed with respect to the frame 13. Then, the hydraulic oil with higher pressure is injected into the pressure cavity 311 of the movable mold body 300 through the oil cylinder, so as to push the piston 500 and the movable mold bottom plate 400 to drive the movable mold 40 to continuously press against the fixed mold 30, thereby ensuring that a larger extrusion force exists between the movable mold 40 and the fixed mold 30, and realizing a good mold locking effect. And thirdly, filling the molten liquid into a cavity formed after the movable mold 40 and the fixed mold 30 are locked through the single injection assembly 15 or the multi-injection assembly 16, and after maintaining the pressure for a certain time, gradually cooling the molten liquid to solidify and form a die-casting product. Fourthly, the reset piece 12d pushes the piston 500 to abut against the limit convex ring 330 of the movable mold body 300 to reset, unloads the split nut 22 on the movable mold body 300, and then the driving assembly 17 drives the whole movable mold assembly 12 and the movable mold 40 to slide along the rack 13 to be away from the fixed mold 30 by a reasonable distance, so that the mold opening of the fixed mold 30 and the movable mold 40 is realized. The die-cast product is then removed. The above steps may be repeated if necessary to process the next die cast product.

In the case of producing another die-casting product of a different model, the fixed die 30 and the movable die 40 of the original specification can be replaced. When the gap between two adjacent mounting rods 14 can accommodate the fixed mold 30 and the movable mold 40 to pass through, the mounting rods 14 do not need to be unloaded from the fixed mold 30 and the movable mold 40, and the disassembled fixed mold 30 and the disassembled movable mold 40 are taken out from the gap between the mounting rods 14, and the fixed mold 30 and the movable mold 40 with new specifications are mounted. When the size of the stationary mold 30 and the movable mold 40 is large so as not to pass through the gap between the adjacent two mounting rods 14, the mounting rods 14 should be pulled out from the stationary mold assembly 11 and the movable mold assembly 12. In the process of pulling out the mounting rod 14, in the first step, the split nut 22 on the fixed mold body 100 is unloaded, and meanwhile, the split nut 22 on the movable mold body 300 is ensured to be in the locked state continuously, at this time, the mounting rod 14 is fixed on the movable mold component 12 and can slide relative to the fixed mold component 11, therefore, the driving component 17 drives the whole movable mold component 12 to be away from the fixed mold component 11, so that the mounting rod 14 is pulled out from the fixed mold mounting hole 11b of the fixed mold component 11 completely. In the second step, the split nut 22 on the movable mold body 300 is unloaded, and the extraction cylinder 21 operates to drive the installation rod 14 to be extracted from the movable mold installation hole 12 b. Therefore, the installation rod 14 is drawn out in two stages, and after the safety rod 173 is completely drawn out from the fixed mold assembly 11 and the movable mold assembly 12, the interference of the installation rod 14 with the fixed mold 30 and the movable mold 40 can be achieved to achieve smooth loading and unloading of the two.

Therefore, the die casting machine 10 can ensure the molding accuracy of the large-volume fixed die assembly 11 and the large-volume movable die assembly 12 by providing the fixed die assembly 11 and the movable die assembly 12. And secondly, the molding quality of the die-casting product can be improved. Thirdly, the pressure of the hydraulic oil in the pressure cavity 311 can be adjusted, so that the whole die casting machine 10 can output constant, uniform, controllable and adjustable die locking force. Fourthly, the single-injection assembly 15 and the multi-injection assembly 16 can be alternatively used according to the requirements of actual conditions, and the multiple-injection assembly provides diversified choices for the production of die-casting products.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A movable die assembly, comprising:

a piston provided on an end face of the second movable die, and

a movable die body slidably connected to the piston, the piston having a connecting end surface connected to the second movable die end surface, all the connecting end surfaces being covered by an orthographic projection of the movable die on the second movable die end surface;

the movable mould body comprises a body part and a plurality of radiation parts, the body part is connected with the piston in a sliding mode, the number of the radiation parts is multiple, the radiation parts extend along the axial direction perpendicular to the body part and are arranged at intervals along the circumferential direction of the body part, and counter bores are formed in the connection position of the body part and the radiation parts.

2. A movable die assembly as claimed in claim 1, wherein the surface of the movable die body facing the movable die base plate is recessed to form a pressure chamber in which the piston is slidably disposed.

3. The movable die assembly as claimed in claim 2, wherein the movable die body comprises a limiting convex ring located in the pressure cavity, the limiting convex ring is connected with the bottom wall surface of the pressure cavity and protrudes relative to the bottom wall surface, a liquid guide hole is further formed in the movable die body, the piston can be abutted against the limiting convex ring and forms a buffer cavity communicated with the liquid guide hole with the movable die body in a surrounding manner, a sunken groove is formed in the surface of the limiting convex ring facing the movable die bottom plate in a sunken manner, and the sunken groove can communicate the buffer cavity with a part of the pressure cavity, which is located outside the buffer cavity.

4. The movable die assembly as claimed in claim 3, wherein the piston has a top surface facing away from the second movable die end surface, and the piston comprises a pressing convex ring connected with the top surface and protruding relative to the top surface, and the pressing convex ring abuts against the limiting convex ring to jointly enclose the buffer cavity.

5. The movable die assembly according to claim 1, wherein the piston includes a slide portion slidably connected to the movable die body, and a plurality of legs connected to the slide portion and spaced apart in a circumferential direction of the slide portion, the connecting end surface being located on the legs, the slide portion having a bottom surface disposed toward the second movable die end surface, the legs being connected to the bottom surface and protruding from the bottom surface, the bottom surface being recessed to form a cavity.

6. The movable die assembly as claimed in claim 1, wherein the radiation part and the movable die base plate are respectively provided with a movable die mounting hole for a mounting rod to pass through.

7. A movable die assembly as recited in claim 1, further comprising a reset member for resetting the piston, the reset member being connected between the second movable die end surface and the movable die body.

8. The movable die assembly as recited in claim 1, further comprising a support ring coupled to the movable die body and capable of fitting over the piston.

9. The movable die assembly as recited in claim 1, wherein the movable die base plate comprises a movable die base plate formed from a steel material.

10. A die casting machine comprising the movable die assembly as claimed in any one of claims 1 to 9.