Lower core tire fixture for improving size precision of cylinder body

Abstract

The utility model discloses a lower core mould fixture for improving the size precision of a cylinder body, which comprises a lower core fixture and a lower core mould, the lower core fixture comprises a lower core fixture frame, sand core top limiting components are arranged at four corners of a cylinder body sand core on the inner top surface of the lower core fixture frame, and each sand core top limiting component comprises a positioning block bracket, the positioning block support comprises a connecting part and a mounting block, a sand core top face limiting block is arranged on the end face of the mounting block, a sand core X-direction limiting plate and a sand core Y-direction limiting plate are arranged on the adjacent side faces away from the cylinder body sand core correspondingly, the core setting mould comprises a core setting mould bottom frame, and a sand core small end cushion block and a sand core large end cushion block are arranged on the two sides of the core setting mould bottom frame correspondingly. Sand core bottom surface positioning blocks are arranged on the end surfaces of the sand core small-end cushion block and the sand core large-end cushion block, sand core X-direction positioning plates are arranged on the two sides of the side surface far away from the cylinder body, and sand core Y-direction positioning plates are arranged on the two end sides. Through the positioning design of the X direction, the Y direction, the top surface and the bottom surface of the cylinder body sand core, the position precision of the sand core can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of tooling fixtures for casting molding lines, and particularly relates to a lower core tire fixture for improving the dimensional accuracy of a cylinder body. Background Art

[0002] Casting molding lines are widely used in mass production of high-end cylinder castings due to their high degree of mechanization, high production efficiency, good casting quality and easy control of casting quality. The main processes of cylinder production on the molding line include molding, core setting, box assembly, pouring, cooling and sand removal. Among them, core setting is a key process on the casting molding line. In order to ensure that the sand core is smoothly and accurately placed in the mold cavity, it is necessary to use a core setting fixture to assist in the completion. The working process is mainly to remove the sand core from the sand core fixture and then transfer the sand core to the mold cavity.

[0003] The main function of the core jig is to ensure that the position of the sand core on the core jig is consistent with the position in the sand mold, and the main function of the core fixture is to ensure that the sand core is accurately and smoothly transferred from the core jig to the sand mold. Since the sand core needs to be combined with the upper and lower sand molds after being lowered into the sand mold, the position of the sand core and the matching clearance with the sand mold will directly affect the dimensional accuracy of the cast casting. The purpose of this application is to provide a core fixture that improves the dimensional accuracy of the cylinder body. Utility Model Content

[0004] The utility model aims to provide a core clamp for improving the dimensional accuracy of a cylinder body, thereby avoiding position deviation and sand rubbing when a sand core is lowered into a sand mold, and improving the dimensional accuracy of a cylinder body casting.

[0005] The technical solution adopted by the utility model is a lower core clamp for improving the dimensional accuracy of the cylinder body, including a lower core clamp and a lower core mold, the lower core clamp includes a lower core clamp frame, the inner top surface of the lower core clamp frame is provided with sand core top limit assemblies at the four corners of the cylinder sand core, the sand core top limit assembly includes a positioning block bracket, the positioning block bracket includes a connecting portion and a mounting block, the connecting portion is arranged on the mounting block for fixedly connecting the lower core clamp frame, the end surface of the mounting block is provided with a sand core top surface limit block, and the adjacent side surfaces away from the cylinder sand core are respectively provided with sand core X-direction limit plates and sand core X-direction limit plates. The core Y-direction limit plate, the lower core jig includes a lower core jig bottom frame, and the sand core small end pad and the sand core large end pad are respectively arranged on both sides of the lower core jig bottom frame to support the small end and the large end of the horizontally placed cylinder sand core, and the end faces of the sand core small end pad and the sand core large end pad are both provided with sand core bottom surface positioning blocks, and the sand core X-direction positioning plates are arranged on both sides of the side away from the cylinder sand core, and the sand core Y-direction positioning plates are arranged on both end sides, and the working surfaces of each limit plate and the positioning plate follow the draft angle of the cylinder sand core, wherein the direction between the large and small ends of the cylinder sand core is the X direction, and the side-by-side combination direction between the sand cores is the Y direction.

[0006] Furthermore, a recessed groove is provided on the end face of the mounting block, and a step is formed on the upper part of the adjacent side surface away from the cylinder sand core. The sand core top surface limit block is fixed in the recessed groove by fasteners, and the ends of the sand core X-direction limit plate and the sand core Y-direction limit plate are provided with right-angle grooves that are clamped on the step and fixed by fasteners.

[0007] Furthermore, the sand core bottom surface positioning block is fixed to the end surfaces of the sand core small end pad and the sand core large end pad by fasteners, and the sand core X-direction positioning plate and the sand core Y-direction positioning plate are provided with right-angle grooves that are clamped on the sand core small end pad and the sand core large end pad and fixed by fasteners.

[0008] Furthermore, the distal ends of the working surfaces of the limiting plate and the positioning plate are provided with an inclination greater than the draft inclination of the cylinder sand core.

[0009] Furthermore, positioning columns are arranged in the middle of the end surface of the small end pad of the sand core and on both sides of the end surface of the large end pad of the sand core, and notches are arranged at corresponding positions of the cylinder sand core.

[0010] The utility model has the following beneficial effects:

[0011] The utility model discloses a lower core clamp for improving the size accuracy of a cylinder body. Positioning and limiting devices are designed on the cylinder body lower core clamp and the lower core mold respectively. The position accuracy of the sand core can be ensured by positioning the cylinder body sand core in the X direction, Y direction and top surface and bottom surface. In addition, the positioning and limiting devices can be flexibly adjusted according to different cylinder body sand cores, and the application range is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view of the utility model;

[0013] Figure 2 yes Figure 1 Middle CC section view;

[0014] Figure 3 It is a side view of the lower core tire mold of the utility model;

[0015] Figure 4 It is a structural schematic diagram of the top limit assembly of the sand core of the utility model;

[0016] Figure 5 It is a structural schematic diagram of the positioning block bracket of the utility model;

[0017] Figure 6 It is a structural schematic diagram of the X-direction limit block of the sand core of the utility model;

[0018] Figure 7 It is a top view of the small end pad of the sand core and the positioning assembly at the bottom of the sand core of the utility model;

[0019] Figure 8It is a side view of the small end pad of the sand core and the positioning assembly at the bottom of the sand core of the utility model;

[0020] Fig. 9 It is a top view of the sand core big end pad and the sand core bottom positioning assembly of the utility model;

[0021] Fig.10 It is a side view of a sand core big end pad and a sand core bottom positioning assembly of the utility model.

[0022] In the figure: 1. core lowering fixture frame; 2. core lowering machine connection frame; 3. cylinder sand core; 4. sand core top limit assembly; 41. positioning block bracket; 411. connection part; 412. mounting block; 413. sink; 414. step; 42. sand core X-axis limit plate; 43. sand core Y-axis limit plate; 44. sand core top surface limit block; 45. sand core top limit plate; 5. core lowering jig bottom frame; 6. core lowering fixture support seat; 61. core lowering fixture positioning support seat; 7. sand core small end pad; 8. sand core large end pad; 9. sand core bottom positioning assembly; 91. sand core bottom surface positioning block; 92. sand core X-axis positioning plate; 93. sand core Y-axis positioning plate; 94. positioning column. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a lower core tire clamp for improving the cylinder size accuracy of the utility model in conjunction with the accompanying drawings.

[0024] like Figure 1~Figure 3 As shown, the direction between the large and small ends of the cylinder sand core 3 is defined as the X direction, and the direction of the side-by-side combination of the sand cores is defined as the Y direction. A core clamp for improving the dimensional accuracy of the cylinder body includes a core clamp and a core jig. The core clamp is functionally divided into two major parts: a clamping mechanism and a positioning mechanism. The clamping mechanism is mainly used to clamp the cylinder sand core 3 and stably place the cylinder sand core 3 from the core jig into the sand mold; the positioning mechanism is distributed at the four corners and the top of the cylinder sand core 3 to ensure that the cylinder sand core 3 can be accurately placed into the sand mold.

[0025] The lower core jig is divided into two parts according to its function: a supporting mechanism and a positioning mechanism. The supporting mechanism is mainly used to raise the cylinder sand core 3 and keep it level. The positioning mechanism is distributed around and at the bottom of the cylinder sand core 3 to position the cylinder sand core 3 in the X direction, Y direction and position.

[0026] The core setting fixture comprises a core setting fixture frame 1, a core setting machine connection frame 2 is arranged on the top surface of the core setting fixture frame 1, and a sand core top limiting assembly 4 is arranged at the four corners of the cylinder sand core 3 on the inner top surface of the core setting fixture frame 1. Figure 4As shown, the sand core top limit assembly 4 includes a positioning block bracket 41, and the positioning block bracket 41 includes a connecting portion 411 and a mounting block 412. The connecting portion 411 is arranged on the mounting block 412 for fixing and connecting the lower core fixture frame 1. The end surface of the mounting block 412 is provided with a sand core top surface limit block 44, which is used for limiting the top of the cylinder sand core 3 to ensure that the cylinder sand core 3 is level. The adjacent side surfaces away from the cylinder sand core 3 are respectively provided with a sand core X-direction limit plate 42 and a sand core Y-direction limit plate 43, which are used for limiting the cylinder sand core 3 in the X-direction and Y-direction to ensure the X-direction and Y-direction position accuracy of the cylinder sand core 3. The working surface of each limit plate follows the draft angle of the cylinder sand core 3, and the far end of the working surface is provided with a slope greater than the draft angle of the cylinder sand core 3, which plays a certain guiding role.

[0027] like Figure 5 and Figure 6 As shown, the end face of the mounting block 412 is provided with a recessed groove 413, and the end face forms a step 414 at the upper part of the adjacent side surface away from the cylinder sand core 3. The sand core top surface limit block 44 is fixed in the recessed groove 413 by fasteners, and the ends of the sand core X-direction limit plate 42 and the sand core Y-direction limit plate 43 are provided with right-angle grooves that are clamped on the step 414 and fixed by fasteners.

[0028] The lower core jig includes a lower core jig bottom frame 5, and lower core jig support seats 6 are arranged on both ends of the upper end of the lower core jig bottom frame 5 to support the lower core jig, wherein the lower core jig support seat 6 includes a lower core jig positioning support seat 61, and a positioning guide pin is arranged on the upper end of the lower core jig positioning support seat 61, which cooperates with the directional guide sleeve arranged on the lower core jig for positioning, and the lower core jig bottom frame 5 is provided with a sand core small end pad 7 and a sand core large end pad 8 on both sides thereof to support the cylinder sand core 3, so that the cylinder sand core 3 is kept in a horizontal state, and the sand core bottom positioning assembly 9 is arranged on the sand core small end pad 7 and the sand core large end pad 8, and the sand core bottom positioning assembly 9 includes a sand core bottom surface positioning block 91 arranged on the end surface of the sand core small end pad 7 and the sand core large end pad 8, and the sand core X-direction positioning plate 92 is arranged on both sides of the side away from the cylinder sand core 3, and the sand core Y-direction positioning plate 93 is arranged on both ends, which are used to limit the X-direction and Y-direction positions of the cylinder sand core 3 respectively. The working surface of each positioning plate follows the draft angle of the cylinder sand core 3, and the far end of the working surface is provided with a slope greater than the draft angle of the cylinder sand core 3, which plays a certain guiding role.

[0029] like Figure 7~Figure 10As shown, the sand core bottom surface positioning block 91 is fixed to the end surface of the sand core small end pad 7 and the sand core large end pad 8 by fasteners, and the sand core X-direction positioning plate 92 and the sand core Y-direction positioning plate 93 are provided with right-angle slots to be clamped on the sand core small end pad 7 and the sand core large end pad 8 and fixed by fasteners. Positioning columns 94 are provided in the middle of the end surface of the sand core small end pad 7 and on both sides of the end surface of the sand core large end pad 8, and a notch is provided at the corresponding position of the cylinder sand core 3 for quick positioning of the cylinder sand core 3 when placed in the lower core mold.

[0030] The lower core clamp of the utility model for improving the dimensional accuracy of the cylinder body has been applied to 23 cylinder body products produced in the newly built factory. Compared with the prior art, the sand core positioning accuracy of the lower core clamp can be controlled within 1mm (0.5mm on one side), the clearance between the cylinder body sand core 3 and the sand mold is uniform, the closing of the box is smooth and stable, the cast casting has high dimensional accuracy, and there will be no sand hole defects in the casting due to the sand rubbing phenomenon caused by the position deviation between the cylinder body sand core 3 and the sand mold when closing the box.

[0031] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A lower core tire fixture for improving the dimensional accuracy of a cylinder body, characterized in that: The invention comprises a lower core fixture and a lower core mold, wherein the lower core fixture comprises a lower core fixture frame (1), wherein the inner top surface of the lower core fixture frame (1) is provided with sand core top limit assemblies (4) at four corners of a cylinder sand core (3), wherein the sand core top limit assemblies (4) comprise a positioning block bracket (41), wherein the positioning block bracket (41) comprises a connecting portion (411) and a mounting block (412), wherein the connecting portion (411) is arranged on the mounting block (412) for fixed connection with the lower core fixture frame (1), wherein the end surface of the mounting block (412) is provided with a sand core top surface limit block (44), and a sand core X-direction limit plate (42) and a sand core Y-direction limit plate (44) are respectively provided on adjacent sides away from the cylinder sand core (3). 43), the lower core jig comprises a lower core jig bottom frame (5), the lower core jig bottom frame (5) is provided with a sand core small end pad (7) and a sand core large end pad (8) on both sides thereof to support the small end and large end of the horizontally placed cylinder sand core (3), the end faces of the sand core small end pad (7) and the sand core large end pad (8) are both provided with sand core bottom surface positioning blocks (91), the sides of the side away from the cylinder sand core (3) are provided with sand core X-direction positioning plates (92), and the two end sides are provided with sand core Y-direction positioning plates (93), and the working surfaces of each limit plate and the positioning plate are all in accordance with the draft angle of the cylinder sand core (3), wherein the direction between the large and small ends of the cylinder sand core (3) is the X direction, and the direction of the side-by-side combination of the sand cores is the Y direction.

2. The lower core tire fixture for improving cylinder size accuracy according to claim 1, characterized in that: The end surface of the mounting block (412) is provided with a recessed groove (413), and the end surface forms a step (414) at the upper portion of the adjacent side surface away from the cylinder sand core (3). The sand core top surface limit block (44) is fixed in the recessed groove (413) by means of fasteners, and the ends of the sand core X-direction limit plate (42) and the sand core Y-direction limit plate (43) are provided with right-angled grooves that are clamped on the step (414) and fixed by means of fasteners.

3. The lower core tire fixture for improving cylinder size accuracy according to claim 1, characterized in that: The sand core bottom surface positioning block (91) is fixed to the end surfaces of the sand core small end pad (7) and the sand core large end pad (8) by means of fasteners, and the sand core X-direction positioning plate (92) and the sand core Y-direction positioning plate (93) are provided with right-angled slots, which are clamped on the sand core small end pad (7) and the sand core large end pad (8) and fixed by means of fasteners.

4. The lower core tire fixture for improving cylinder size accuracy according to claim 1, characterized in that: The distal ends of the working surfaces of the limiting plate and the positioning plate are provided with an inclination greater than the draft inclination of the cylinder sand core (3).

5. The lower core tire fixture for improving cylinder size accuracy according to any one of claims 1 to 4, characterized in that: Positioning columns (94) are arranged in the middle of the end surface of the small end pad (7) of the sand core and on both sides of the end surface of the large end pad (8) of the sand core, and a notch is arranged at a corresponding position of the cylinder sand core (3).

Images