Automatic profiling die and method for inclined guide core-pulling sliding block structure

Abstract

The invention belongs to the field of casting machining, and relates to an automatic profiling mold and method for an inclined guide core-pulling sliding block structure. The mold comprises an upper pressing mold, a lower mold, a bottom plate, an air cylinder, mold feet, a top plate assembly, a sliding rail, an inclined sliding block, a core block, an ejector rod and a spring. The upper profiling is connected to an upper pressing plate of the wax injection machine; the bottom plate is fixed on a wax press workbench, the cylinder is arranged in the middle of the bottom plate, the mold feet are arranged around the bottom plate, and the lower mold is arranged at the tops of the mold feet; the upper end of the inclined through hole is close to the center; the inclined section of the inclined sliding block penetrates through the inclined through hole and penetrates out of the lower surface of the lower die; blind holes are formed in the edge of the lower surface of the lower die; a sliding rail is arranged on the upper surface of the top plate assembly in the radial direction, and the bottom of the inclined section of the inclined sliding block slides on the sliding rail through the sliding block. The ejector rod is fixed to the edge of the ejector plate assembly, the upper portion of the ejector rod extends into the blind hole, and the spring sleeves the ejector rod and is located between the lower die and the ejector plate assembly.

Description

Technical Field

[0001] The invention belongs to the field of casting processing and relates to an automatic pressing mold and a method for an oblique-guide core-pulling slider structure. Background Art

[0002] In the process of designing the die for investment casting, in order to improve the precision and production efficiency, the integral metal core block is often designed according to the shape of the inner cavity structure to form the required structure of the wax mold. After the wax mold is pressed, the core block is withdrawn through the positioning guide hole, and then the pressed wax mold is taken out of the die. However, for some castings whose inner cavity exceeds the outlet size, see the attached Figure 1 According to the conventional overall design method, the metal core blocks at both ends of the casting cannot be withdrawn after the wax mold is pressed. According to the structural characteristics of the inner cavity of the casting, the middle part has a large space. For the purpose of operation, the manual pressing mold often manufactures the core blocks of the inner cavity of the wax mold into a combined structure of 3 pieces (see attached Figure 2 ), after the wax mold is pressed, the middle 1# core block is first completely withdrawn upwards during the mold removal process, and then the core blocks 2# and 3# at both ends are moved to the middle respectively, and taken out in sequence. This structure is suitable for manual wax mold manufacturing, and can only press one piece in one cavity, with low production efficiency, and is no longer suitable for automated mass production. In order to improve the efficiency of wax mold pressing, an automatic wax pressing machine is used. The original core block structure is no longer suitable for wax pressing machine production, and a new type of automatic pressing mold is needed to match it. During the wax pressing process of the wax pressing machine, the core block can be automatically and quickly withdrawn to complete the wax mold manufacturing process. Summary of the invention

[0003] The invention aims at a novel automatic pressing mold with an inclined guide core-pulling slider. In the process of investment casting, for some castings whose inner cavity exceeds the outlet size, when a wax injection machine is used to make wax molds, the core block can be quickly and automatically withdrawn for demoulding, and multiple pieces can be realized in one cavity, greatly improving the efficiency of wax mold manufacturing.

[0004] Technical Solution

[0005] An automatic pressing mold with an oblique guide core-pulling slider structure, comprising: an upper pressing mold, a lower mold, a bottom plate, a cylinder, a mold foot, a top plate assembly, a slide rail, an oblique slider, a core block, a push rod, a spring, and a reset rod;

[0006] The upper pressure type is connected to the upper pressure plate of the wax pressing machine;

[0007] The bottom plate is fixed on the wax press workbench, a cylinder is installed in the middle of the bottom plate, mold feet are installed around the bottom plate, and the lower mold is installed on the top of the mold feet; the core block is fixed in each cavity of the lower mold, and the lower mold is provided with inclined slider guide holes distributed at both ends of the core block; the inclined slider is in a 7-shape, and the inclined section of the inclined slider passes through the guide hole and out of the lower surface of the lower mold; two cylindrical ejector guide holes are provided at both ends of each cavity of the lower mold for ejector guide.

[0008] A top plate assembly is fixed on the cylinder, a slide rail is radially arranged on the upper surface of the top plate assembly, and the bottom of the inclined section of the inclined slide block slides on the slide rail through the slide block;

[0009] The top plate assembly fixes the ejector rod, the reset rod and the slide rail. The top of the ejector rod extends into the cylindrical guide hole of the lower die ejector rod. The spring is sleeved on the reset rod and is located between the lower die and the ejector plate assembly.

[0010] Further, the upper die press comprises an upper die plate and an upper die, the upper die plate being fixed below the upper die plate of the wax injection machine, and the upper die being fixed below the upper die plate;

[0011] The upper template is a plate-like structure with four bolt holes evenly distributed;

[0012] The lower surface of the upper mold is provided with N groups of wax mold concave molds, and the N groups of wax model cavities are connected through runners; a cooling water circuit is provided inside the upper mold;

[0013] A wax injection port is provided on the side of the upper mold to connect to the pouring channel, and the wax injection port is connected to the wax injection nozzle of the wax injection machine.

[0014] Two mold closing guide blind holes are arranged diagonally at two ends of the lower surface of the upper mold.

[0015] The main forming part of the outer contour of the wax model is designed in the upper mold. The upper mold has a simple structure. After the wax is pressed, the friction force on the upper surface of the wax model by the mold cavity is small, and the wax model is easily separated from the upper model cavity.

[0016] Furthermore, the mold foot is a rectangular tube with upper and lower openings, which is used to support the lower mold and is conducive to installing the top plate assembly and forming an ejection stroke space.

[0017] Furthermore, the upper surface of the lower mold is provided with N cavities, each of which is provided with a core block and two inclined slider guide holes and a push rod guide hole;

[0018] The cavity is in a step shape, the core block is arranged in the middle of the cavity, two inclined slider guide holes are symmetrically arranged at both ends of the core block, and the ejector guide holes are arranged at both ends of each cavity;

[0019] The core block and the upper end surfaces of the two inclined slide blocks together form a punch;

[0020] A cooling water circuit is provided in the lower die;

[0021] Two stepped reset guide holes are provided in the lower die;

[0022] Two mold closing guide pillars are provided at both ends of the lower mold;

[0023] A wax injection port is provided on the side of the lower mold to connect N cavities.

[0024] The main forming part of the inner contour of the wax model is designed in the lower mold, and the lower mold structure is complex. The core block and the inclined slider are set in the lower mold, which is easy to install and convenient for subsequent wax mold ejection and demolding operations. During the wax mold manufacturing process, the lower surface of the wax mold is subject to a large friction force from the lower mold cavity surface, the core block and the inclined slider, and is retained in the lower mold for removal.

[0025] Furthermore, the top plate assembly is provided with 2N slide rails, the cross section of which is T-shaped, and each two slide rails form a group and are arranged in parallel to control the inclined sliding block to slide along the radial direction.

[0026] Furthermore, the end of the inclined section of the inclined sliding block is T-shaped; when the top plate assembly is reset, the slide rail drives the inclined sliding block to move downward through the T-shaped end surface of the inclined sliding block matched therewith.

[0027] The horizontal section of the inclined slider is divided into three sections, which are, from the inside to the outside, a semicircle with the cylindrical surface facing upward, a rectangular surface facing downward, and a small cylinder.

[0028] Furthermore, the mold also includes a reset rod; the reset rod is a cylinder with a rod cap; it cooperates with the step reset guide hole in the lower mold to control the downward movement stroke of the top plate assembly.

[0029] Two stepped cylindrical resetting guide holes are arranged at both ends of the lower die.

[0030] The reset rod is inserted into the step hole and the lower end is fixed to the top plate assembly;

[0031] The movement stroke of the top plate assembly is limited by the cooperation between the rod cap and the step hole.

[0032] An automatic profiling method for an oblique guide core-pulling slider structure, the steps are as follows:

[0033] Step 1: Start the wax press machine. The upper platen of the wax press machine drives the upper mold to move upward, remove foreign matter on the upper and lower mold surfaces, and apply mold release agent on the upper and lower mold surfaces;

[0034] Step 2: Control the clamping of the upper and lower molds;

[0035] Step 3, control the wax injection machine to inject wax liquid through the wax injection nozzle and maintain the pressure;

[0036] Step 4: After the holding time is completed, the upper pressure plate of the wax pressing machine is controlled to drive the upper mold to rise;

[0037] Step 5: Use compressed air to remove the flash around the wax model, use a wax knife to separate the wax injection runner from the wax model, and control the cylinder to push out the wax model;

[0038] Step 6: The ejector cylinder retracts, and the ejector assembly drives the inclined slide block to reset downward under the action of the reset spring and reset rod. Use compressed air or manually clean the excess residual wax on the upper and lower molds.

[0039] Furthermore, when the temperature is greater than 20°C, turn on the ice machine to cool the upper and lower molds.

[0040] Furthermore, the holding pressure is 0.5-0.6 MPa, and the holding time is 20s-40s.

[0041] Beneficial effects: The automatic pressing mold with an inclined guide core-pulling slider structure has a simple structure, low manufacturing and installation costs, simplified operation, and easy use. It further broadens the scope of use of the automatic pressing mold and can achieve multiple parts in one cavity, thereby increasing the efficiency of the wax mold manufacturing of the casting by more than 10 times compared to manual wax pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 : Casting structure diagram;

[0043] Figure 2 : Manual pressing structure diagram;

[0044] Among them: 1—left type, 2—2# core block, 3—1# core block, 4—3# core block, 5—right type;

[0045] Figure 3 : Sectional view of the new automatic pressing die with inclined guide core pulling structure;

[0046] Among them: 01—upper mold plate; 02—upper mold; 03—fixed core block; 04—lower mold; 05—inclined slider; 06—slide rail; 07—elevator; 08—reset spring; 09—push plate; 10—elevator plate; 11—mold foot; 12—ejection cylinder; 13—bottom plate;

[0047] Figure 4 : General diagram of automatic pressing die with oblique guide core pulling structure;

[0048] Among them: 14—cooling water joint; 15—reset rod;

[0049] Figure 5 : Upper template structure diagram;

[0050] Figure 6 :Upper mold structure diagram;

[0051] Figure 7 : Lower mold structure diagram;

[0052] Figure 8 : Mould foot structure diagram;

[0053] Fig. 9 : Bottom plate structure diagram;

[0054] Fig.10 : Structural diagram of the inclined slider;

[0055] Fig.11 : Slide rail structure diagram;

[0056] Fig.12 : Structural diagram of inclined slider installation;

[0057] Fig.13 : Reset rod structure diagram;

[0058] Fig.14 : Top plate structure diagram;

[0059] Fig.15 : Top rod structure diagram. DETAILED DESCRIPTION

[0060] As attached Figure 4 As shown, an automatic pressing mold with an oblique guide core-pulling slider structure includes: an upper pressing mold, a lower mold, a bottom plate, a cylinder, a mold foot, a top plate assembly, a slide rail, an oblique slider, a core block, a push rod, a spring, and a reset rod;

[0061] The upper pressure type is connected to the upper pressure plate of the wax pressing machine;

[0062] The bottom plate is fixed on the wax press workbench, a cylinder is installed in the middle of the bottom plate, mold feet are installed around the bottom plate, and the lower mold is installed on the top of the mold feet; the core block is fixed in each cavity of the lower mold, and the lower mold is provided with inclined slider guide holes distributed at both ends of the core block; the inclined slider is in a 7-shape, and the inclined section of the inclined slider passes through the guide hole and out of the lower surface of the lower mold; two cylindrical ejector guide holes are provided at both ends of each cavity of the lower mold for ejector guide.

[0063] A top plate assembly is fixed on the cylinder, a slide rail is radially arranged on the upper surface of the top plate assembly, and the bottom of the inclined section of the inclined slide block slides on the slide rail through the slide block;

[0064] The top plate assembly fixes the ejector rod, the reset rod and the slide rail. The top of the ejector rod extends into the cylindrical guide hole of the lower die ejector rod. The spring is sleeved on the reset rod and is located between the lower die and the ejector plate assembly.

[0065] Further, the upper die press comprises an upper die plate and an upper die, the upper die plate being fixed below the upper die plate of the wax injection machine, and the upper die being fixed below the upper die plate;

[0066] The upper template is a plate-like structure with four bolt holes evenly distributed;

[0067] The lower surface of the upper mold is provided with N groups of wax mold concave molds, and the N groups of wax model cavities are connected through runners; a cooling water circuit is provided inside the upper mold;

[0068] A wax injection port is provided on the side of the upper mold to connect to the pouring channel, and the wax injection port is connected to the wax injection nozzle of the wax injection machine.

[0069] Two mold closing guide blind holes are arranged diagonally at two ends of the lower surface of the upper mold.

[0070] The main forming part of the outer contour of the wax model is designed in the upper mold. The upper mold has a simple structure. After the wax is pressed, the friction force on the upper surface of the wax model by the mold cavity is small, and the wax model is easily separated from the upper model cavity.

[0071] Furthermore, the mold foot is a rectangular tube with upper and lower openings, which is used to support the lower mold and is conducive to installing the top plate assembly and forming an ejection stroke space.

[0072] Furthermore, the upper surface of the lower mold is provided with N cavities, each of which is provided with a core block and two inclined slider guide holes and a push rod guide hole;

[0073] The cavity is in a step shape, the core block is arranged in the middle of the cavity, two inclined slider guide holes are symmetrically arranged at both ends of the core block, and the ejector guide holes are arranged at both ends of each cavity;

[0074] The core block and the upper end surfaces of the two inclined slide blocks together form a punch;

[0075] A cooling water circuit is provided in the lower die;

[0076] Two stepped reset guide holes are provided in the lower die;

[0077] Two mold closing guide pillars are provided at both ends of the lower mold;

[0078] A wax injection port is provided on the side of the lower mold to connect N cavities.

[0079] The main forming part of the inner contour of the wax model is designed in the lower mold, and the lower mold structure is complex. The core block and the inclined slider are set in the lower mold, which is easy to install and convenient for subsequent wax mold ejection and demolding operations. During the wax mold manufacturing process, the lower surface of the wax mold is subject to a large friction force from the lower mold cavity surface, the core block and the inclined slider, and is retained in the lower mold for removal.

[0080] Furthermore, the top plate assembly is provided with 2N slide rails, the cross section of which is T-shaped, and each two slide rails form a group and are arranged in parallel to control the inclined sliding block to slide along the radial direction.

[0081] Furthermore, the end of the inclined section of the inclined sliding block is T-shaped; when the top plate assembly is reset, the slide rail drives the inclined sliding block to move downward through the T-shaped end surface of the inclined sliding block matched therewith.

[0082] The horizontal section of the inclined slider is divided into three sections, which are, from the inside to the outside, a semicircle with the cylindrical surface facing upward, a rectangular surface facing downward, and a small cylinder.

[0083] Furthermore, the mold also includes a reset rod; the reset rod is a cylinder with a rod cap; it cooperates with the step reset guide hole in the lower mold to control the downward movement stroke of the top plate assembly.

[0084] Two stepped cylindrical resetting guide holes are arranged at both ends of the lower die.

[0085] The reset rod is inserted into the step hole and the lower end is fixed to the top plate assembly;

[0086] The movement stroke of the top plate assembly is limited by the cooperation between the rod cap and the step hole.

[0087] The main steps of using the device to make wax models are as follows:

[0088] Step 1: Fix the automatic pressing mold with an oblique guide core-pulling slider structure on the working platform and upper pressure plate of the automatic wax pressing machine with bolts, align the wax injection port of the mold with the wax injection nozzle of the wax pressing machine and press them tightly, connect the mold cooling water joint to the ice water machine through a hose, connect the cylinder valve switch to the air source of the wax pressing machine, and complete the mold installation.

[0089] Step 2: Start the wax press and press the mold opening button. The upper pressure plate of the wax press drives the upper mold to move upward, and the automatic mold opens. Use compressed air to remove foreign matter on the mold surface as required, and evenly apply a layer of release agent on the surface.

[0090] Step 3: Control the mold closing button, and the upper mold is closed through the action of the wax press guide rod and the lower mold guide column. When the upper and lower molds maintain a certain mold closing pressure and the wax cylinder is closed, start the wax pressing function of the wax press. The wax press cylinder squeezes the wax paste with suitable temperature into the automatic molding mold through the wax delivery pipe and the wax injection nozzle under a certain pressure, and the wax paste solidifies under pressure to form the required wax model.

[0091] Step 4: After the holding time is completed, turn off the wax pressing function. Press the mold opening button, the upper pressing plate of the wax pressing machine drives the upper pressing mold to rise, the automatic wax pressing mold opens, and the wax mold is retained in the lower pressing mold under the action of the core block.

[0092] Step 5: Use compressed air to remove the flash around the wax mold, use a wax knife to separate the wax injection runner from the wax mold, slowly start the cylinder valve switch, and the mold top plate slowly drives the push plate, push rod, slide rail, inclined slider, and wax mold to move upward at the same time under the upward force of the cylinder, and the wax mold gradually separates from the lower mold cavity and the fixed core block. At the same time, the inclined slider is acted upon by the fixed core block, the guide hole of the lower mold core block and the slide rail in the lower mold, and moves upward at the same time as the wax mold, moves along the slide rail, and shrinks inward, and the inclined slider gradually separates from the two ends of the wax mold cavity (large inside and small outside), and moves to the middle of the wax mold where the space is large and easy to remove.

[0093] Step 6: When the top plate drives the inclined slide and wax mold to the limit position of the ejector rod, stop and manually take out the pressed wax mold. Control the cylinder valve switch, the ejector mechanism cylinder retracts, and the top plate drives the push plate, ejector rod, slide rail, and inclined slide to reset downward under the action of the reset spring and reset rod. When the upper and lower molds are open, use compressed air or manually to clean the excess residual wax in the upper and lower mold cavities of the mold, and the wax mold manufacturing process is completed.

[0094] Step 7. After multiple wax pressing, the temperature of the pressing mold continues to rise. To ensure the normal progress of the wax pressing process, when the temperature is greater than 20°C, turn on the ice machine and let the cooling water enter the mold through the nozzle to achieve temperature control of the pressing mold.

Claims

1. An automatic pressing die with an oblique guide core-pulling slider structure, characterized in that: The mold includes: Upper die, lower die, bottom plate, cylinder, die foot, top plate assembly, slide rail, inclined slide block, core block, ejector rod; The upper pressure type is connected to the upper pressure plate of the wax pressing machine; The bottom plate is fixed on the wax press workbench, a cylinder is installed in the middle of the bottom plate, mold feet are installed around the bottom plate, and a lower mold is installed on the top of the mold feet; the lower mold is provided with an oblique through hole, and the upper end of the oblique through hole is close to the center; the oblique slide block is 7-shaped, and the oblique section of the oblique slide block passes through the oblique through hole and passes through the lower surface of the lower mold; the edge of the lower surface of the lower mold is provided with a push rod guide hole; A top plate assembly is fixed on the cylinder, a slide rail is radially arranged on the upper surface of the top plate assembly, and the bottom of the inclined section of the inclined slide block slides on the slide rail through the slide block; The top plate assembly edge fixes the top rod, and the top of the top rod extends into the top rod guide hole.

2. The mold according to claim 1, characterized in that: The upper pressing mold includes an upper template and an upper die, wherein the upper template is fixed below the upper pressing plate of the wax pressing machine, and the upper die is fixed below the upper template; The upper template is a plate-like structure with four bolt holes evenly distributed; The two diagonal ends of the lower surface of the upper mold are provided with mold closing guide blind holes; The lower surface of the upper mold is provided with N groups of wax mold concave molds, and the N groups of wax model cavities are connected through runners; a cooling water circuit is provided inside the upper mold; A wax injection port is provided on the side of the upper mold to connect to the pouring channel, and the wax injection port is connected to the wax injection nozzle of the wax injection machine.

3. The mold according to claim 2, characterized in that: The mold foot is a cylinder or rectangular cylinder with openings at the top and bottom.

4. The mold according to claim 3, characterized in that: The upper surface of the lower mold is provided with N cavities, each of which is provided with a core block and two inclined slide blocks; mold closing guide columns are provided at the diagonal ends of the lower mold; The cavity is in a step shape, the core block is arranged in the middle of the cavity, and two inclined sliders are symmetrically arranged at both ends of the cavity; The core block and the upper end surfaces of the two inclined slide blocks together form a punch; A cooling water circuit is provided in the lower die; A wax injection port is provided on the side of the lower mold to connect N cavities.

5. The mold according to claim 4, characterized in that: The top plate assembly is provided with 2N slide rails, with each two slide rails forming a group and arranged in parallel.

6. The mold according to claim 5, characterized in that: The end of the inclined section of the inclined slide block is V-shaped; The horizontal section of the inclined sliding block is divided into three sections, which are, from the inside to the outside, a semicircle with the cylindrical surface facing upward, a semicircle with the cylindrical surface facing downward, and a small cylinder.

7. The mold according to claim 6, characterized in that: The mold further comprises a reset rod; the reset rod is a cylinder with a rod cap; The lower die has a stepped hole The reset rod is inserted into the step hole and the lower end is fixed to the top plate assembly; the spring is sleeved on the reset rod and located between the lower die and the top plate assembly; the movement stroke of the top plate assembly is limited by the cooperation of the rod cap and the step hole.

8. An automatic profiling method for an oblique guide core-pulling slider structure, characterized in that: Here are the steps: Step 1: Start the wax press, the upper platen of the wax press drives the upper die to move upward, remove foreign matter on the upper and lower die surfaces, and apply mold release agent on the upper and lower die surfaces; Step 2: Control the clamping of the upper and lower molds; Step 3, control the wax injection machine to inject wax liquid through the wax injection nozzle and maintain the pressure; Step 4: After the holding time is completed, the upper pressure plate of the wax pressing machine is controlled to drive the upper mold to rise; Step 5: Use compressed air to remove the flash around the wax model, use a wax knife to separate the wax injection runner from the wax model, and control the cylinder to push out the wax model; Step 6: The ejector cylinder retracts, and the ejector assembly drives the inclined slide block to reset downward under the action of the reset spring and reset rod. Use compressed air or manually clean the excess residual wax on the upper and lower molds.

9. The method according to claim 8, characterized in that: When the temperature is greater than 20°C, turn on the ice machine to cool the upper and lower molds.

10. The method according to claim 9, characterized in that: The holding pressure is 0.5-0.6 MPa, and the time is 20s-40s.

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