阅读说明：本技术 一种新型树脂砂型芯定位方法 (Novel resin sand core positioning method ) 是由 田杨 付振国 张南 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种新型树脂砂型芯定位方法,包括定位模块和定位方法,所述定位模块由砂型、砂芯、公销、母销、第一定位销座和第二定位销座构成,所述砂型与砂芯相嵌合,所述公销与母销相适配；所述公销、母销、第一定位销座和第二定位销座分别预埋在砂型和砂芯内部。本发明采用公销与母销预埋在砂型和砂芯中的方式,对砂型和砂芯进行精确的定位,装配的精度更高,并且使用寿命更长,能够根据实际使用情况灵活调节公销和母销的位置,不仅能够引导砂芯正确入位,还能够避免砂芯产生变形而造成铸件出现尺寸偏差。(The invention discloses a novel resin sand core positioning method, which comprises a positioning module and a positioning method, wherein the positioning module consists of a sand mold, a sand core, a male pin, a female pin, a first positioning pin seat and a second positioning pin seat, the sand mold is embedded with the sand core, and the male pin is matched with the female pin; the male pin, the female pin, the first positioning pin seat and the second positioning pin seat are pre-embedded inside the sand mold and the sand core respectively. The invention adopts the mode that the male pin and the female pin are embedded in the sand mold and the sand core, carries out accurate positioning on the sand mold and the sand core, has higher assembly precision and longer service life, can flexibly adjust the positions of the male pin and the female pin according to the actual use condition, not only can guide the sand core to be correctly positioned, but also can avoid the size deviation of a casting caused by the deformation of the sand core.)

1. The novel resin sand core positioning method comprises a positioning module and a positioning method, and is characterized in that: the positioning module is composed of a sand mold (1), a sand core (2), a male pin (3), a female pin (4), a first positioning pin seat (5) and a second positioning pin seat (6), the sand mold (1) is embedded with the sand core (2), and the male pin (3) is matched with the female pin (4);

the male pin (3), the female pin (4), the first positioning pin seat (5) and the second positioning pin seat (6) are respectively embedded inside the sand mold (1) and the sand core (2).

2. The novel resin sand core positioning method as claimed in claim 1, wherein: the upper surface of the male pin (3) is provided with a guide post (31), and the inner wall of the opening of the female pin (4) is provided with a guide groove (41);

the diameter of the inner wall of the opening of the female pin (4) is matched with the diameter of the outer wall of the guide column (31), and the outer wall of the upper end of the guide column (31) is designed by adopting an arc-shaped process.

3. The novel resin sand core positioning method as claimed in claim 1, wherein: the outer wall of the male pin (3) is provided with the sand pulling slope (32), so that the stress area of the male pin (3) embedded in the resin sand can be increased, and the stability is improved.

4. The novel resin sand core positioning method as claimed in claim 1, wherein: a positioning hole (51) is formed in the first positioning pin seat (5), and a bulge (61) is formed on the surface of the second positioning pin seat (6);

the protrusion (61) is matched with the positioning hole (51), and the height of the protrusion (61) is larger than the thickness of the first positioning pin seat (5).

5. The novel resin sand core positioning method as claimed in claim 1, wherein: the sand mould (1) is matched with the sand core (2), and the sand mould (1) and the sand core (2) are designed by adopting resin sand materials.

6. The novel resin sand core positioning method as claimed in claim 1, wherein: the positioning method comprises the following steps:

the first step is as follows: respectively installing a first positioning pin seat (5) and a second positioning pin seat (6) in a sand mold (1) and a sand core (2), wherein the first positioning pin seat (5) is installed on the lower surface of the sand mold (1), the second positioning pin seat (6) is installed on the upper surface of the sand core (2), and the first positioning pin seat (5) corresponds to the second positioning pin seat (6);

the second step is that: respectively connecting the male pin (3) and the female pin (4) with a first positioning pin seat (5) and a second positioning pin seat (6), and pre-embedding the male pin (3) and the female pin (4) in the sand mold (1) and the sand core (2);

the third step: and (3) embedding the sand mold (1) and the sand core (2) into each other, so that the upper end of the male pin (3) is inserted into the female pin (4).

7. The novel resin sand core positioning method as claimed in claim 1, wherein: the male pin (3) and the female pin (4) have the following installation modes when the sand molds (1) and the sand cores (2) are different in shape:

a. when the sand core (2) is flat and long and is easy to deform, three or more male pins (3) and female pins (4) are embedded in the sand mold (1) and the sand core (2) in an equidistance arrangement mode, so that the sand mold (1) and the sand core (2) cannot deform after being matched;

b. when psammitolite (2) are circular, and possess two-layer and two-layer more than psammitolite (2) and sand mould (1) when matching, pre-buried corresponding public round pin (3) and female round pin (4) of sand mould (1) and psammitolite (2) centre of a circle position department, the pre-buried public round pin (3) and female round pin (4) that are circular array distribution in sand mould (1) and psammitolite (2) edge, the matching of guarantee sand mould (1) and psammitolite (2) keeps concentric.

Technical Field

The invention relates to the technical field of sand mold casting technology, in particular to a novel resin sand core positioning method.

Background

In the existing manual molding process of the self-hardening resin sand, the quality of a casting depends on the skill level and proficiency of workers to a great extent, so that great fluctuation exists.

The existing core setting assembly process mainly adopts the process of designing an original model and a core box to position a core seat and a core print for molding, the structure is similar to a step shape, if the two sides and the bottom of the core are made into a step shape, the two corresponding step structures are attached and combined to finish the assembly when the core is set. However, the positioning process has high requirements on the dimensional accuracy of the mold, the assembly and the molding of a core making tool core box, the strength of the resin sand cannot be low, and the refractory coating is not brushed on the positioning surface, which all affect the size of the positioning surface and the matching of the core during core setting, and some casting factories pay attention to the problems during core setting to adjust the dimensional accuracy required by the drawing. However, most workers can freely put cores into the core print seats, the position gap of the core print positioned by the core print on the sand mould is designed to be 1mm, and the surface gap irrelevant to the positioning is 2 to 5mm, so that the sand core has enough space to be smoothly put into the core print seats when the cores are put, but along with the improvement of the dimensional tolerance grade of the castings by customers, the larger core putting gap can not meet the production requirement of the castings, and the core putting gap is reduced to ensure that the core matching can be controlled within the tolerance range required by the customers, thereby forming the main target.

However, the manual molding process is quite dependent on a foundry worker, a small core setting gap indirectly leads to the fact that some foundry workers cannot set the cores normally, workers can polish the sand cores privately to increase the space during core setting, the original purpose of reducing the core setting gap is violated, meanwhile, hidden dangers are buried, height steps or size super-differences occur in the matching positions of the cores after casting molding, and economic losses of enterprises are caused.

Disclosure of Invention

The invention aims to provide a novel resin sand core positioning method to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a novel resin sand core positioning method comprises a positioning module and a positioning method, wherein the positioning module consists of a sand mold, a sand core, a male pin, a female pin, a first positioning pin seat and a second positioning pin seat, the sand mold is embedded with the sand core, and the male pin is matched with the female pin;

the male pin, the female pin, the first positioning pin seat and the second positioning pin seat are pre-embedded inside the sand mold and the sand core respectively.

Preferably, the upper surface of the male pin is provided with a guide post, and the inner wall of the opening of the female pin is provided with a guide groove;

the diameter of the inner wall of the opening of the female pin is matched with the diameter of the outer wall of the guide post, and the outer wall of the upper end of the guide post is designed by adopting an arc-shaped process.

Preferably, the outer wall of the male pin is provided with the inclined sand pulling part, so that the stress area of the male pin embedded in the resin sand can be increased, and the stability is improved.

Preferably, the first positioning pin seat is internally provided with a positioning hole, and the surface of the second positioning pin seat is provided with a bulge;

the protrusion is matched with the positioning hole, and the height of the protrusion is larger than the thickness of the first positioning pin seat.

Preferably, the sand mold is matched with the sand core, and the sand mold and the sand core are designed by adopting resin sand materials.

Preferably, the positioning method comprises the following steps:

the first step is as follows: respectively installing a first positioning pin seat and a second positioning pin seat in the sand mold and the sand core, wherein the first positioning pin seat is installed on the lower surface of the sand mold, and the second positioning pin seat is installed on the upper surface of the sand core, so that the first positioning pin seat corresponds to the second positioning pin seat in position;

the second step is that: respectively connecting the male pin and the female pin with a first positioning pin seat and a second positioning pin seat, and embedding the male pin and the female pin in the sand mold and the sand core;

the third step: and (4) embedding the sand mold and the sand core into each other, so that the upper end of the male pin is inserted into the female pin.

Preferably, the male pin and the female pin have the following installation modes when the sand molds and the sand cores are different in shape:

a. when the sand core is flat and long and is easy to deform, three or more male pins and female pins are embedded in the sand mold and the sand core in an equidistance arrangement mode, so that the sand mold and the sand core cannot deform after being matched;

b. when the sand core is circular, and has two or more than two layers of sand cores to match with the sand mould, the corresponding male pin and female pin are pre-embedded at the circle center positions of the sand mould and the sand core, and the pre-embedding of the edges of the sand mould and the sand core is the male pin and the female pin distributed in a circular array, so that the matching of the sand mould and the sand core is kept concentric.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the sand mold and the sand core are accurately positioned by embedding the male pin and the female pin in the sand mold and the sand core, the assembly precision is higher, the precision can be controlled within 0.2mm, the male pin and the female pin are made of metal materials, the service life is longer, the positions of the male pin and the female pin can be flexibly adjusted according to the actual use condition, the sand core can be guided to be correctly positioned, and the size deviation of a casting caused by the deformation of the sand core can be avoided.

Drawings

FIG. 1 is a schematic view of a sand mold and core engagement structure according to the present invention;

FIG. 2 is a schematic view of a male pin of the present invention;

FIG. 3 is a schematic front view of the female pin of the present invention;

FIG. 4 is a schematic cross-sectional view of a first locating pin boss of the present invention;

FIG. 5 is a schematic top view of the first positioning pin seat of the present invention;

FIG. 6 is a schematic front view of a second dowel seat according to the present invention;

fig. 7 is a schematic bottom view of a second alignment pin seat of the present invention.

In the figure: 1. sand molding; 2. a sand core; 3. a male pin; 31. a guide post; 32. shifting sand to incline; 4. a female pin; 41. a guide groove; 5. a first locating pin boss; 51. positioning holes; 6. a second locating pin boss; 61. and (4) protruding.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 7, the present invention provides two embodiments: a novel resin sand core positioning method comprises a positioning module and a positioning method;

the first embodiment is as follows:

the positioning module is composed of a sand mold 1, a sand core 2, a male pin 3, a female pin 4, a first positioning pin seat 5 and a second positioning pin seat 6, the sand mold 1 is embedded with the sand core 2, and the male pin 3 is matched with the female pin 4;

the male pin 3, the female pin 4, the first positioning pin boss 5 and the second positioning pin boss 6 are respectively embedded in the sand mold 1 and the sand core 2.

The upper surface of the male pin 3 is provided with a guide post 31, and the inner wall of the opening of the female pin 4 is provided with a guide groove 41;

the diameter of the inner wall of the opening of the female pin 4 is matched with the diameter of the outer wall of the guide column 31, and the outer wall of the upper end of the guide column 31 is designed by adopting an arc-shaped process.

The outer wall of the male pin 3 is provided with the sand-pulling slope 32, so that the stress area of the male pin 3 embedded in the resin sand can be increased, and the stability is improved.

A positioning hole 51 is formed in the first positioning pin seat 5, and a protrusion 61 is arranged on the surface of the second positioning pin seat 6;

the protrusion 61 is matched with the positioning hole 51, and the height of the protrusion 61 is greater than the thickness of the first positioning pin seat 5.

The sand mould 1 is matched with the sand core 2, and the sand mould 1 and the sand core 2 are both designed by adopting resin sand materials.

Public round pin 3 and female 4 pre-buried modes in sand mould 1 and psammitolite 2, carry out accurate location to sand mould 1 and psammitolite 2, the precision of assembly is higher, the precision can be controlled within 0.2mm, public round pin 3 adopts metal material to make with female round pin 4, long service life, can be according to the nimble position of adjusting public round pin 3 and female round pin 4 of the in-service use condition, not only can guide psammitolite 2 correctly to go into the position, can also avoid psammitolite 2 to produce and warp and cause the foundry goods size deviation to appear.

Example two:

the positioning method comprises the following steps:

the first step is as follows: respectively installing a first positioning pin seat 5 and a second positioning pin seat 6 inside a sand mold 1 and a sand core 2, wherein the first positioning pin seat 5 is installed on the lower surface of the sand mold 1, and the second positioning pin seat 6 is installed on the upper surface of the sand core 2, so that the first positioning pin seat 5 corresponds to the second positioning pin seat 6 in position;

the second step is that: respectively connecting the male pin 3 and the female pin 4 with a first positioning pin seat 5 and a second positioning pin seat 6, and pre-embedding the male pin 3 and the female pin 4 in the sand mold 1 and the sand core 2;

the third step: and (3) embedding the sand mold 1 and the sand core 2 into each other, so that the upper end of the male pin 3 is inserted into the female pin 4.

The male pin 3 and the female pin 4 have the following installation modes when the sand molds 1 and the sand cores 2 are different in shape:

a. when the sand core 2 is flat and long and is easy to deform, three or more than three male pins 3 and female pins 4 are embedded in the sand mold 1 and the sand core 2 at equal intervals, so that the sand mold 1 and the sand core 2 cannot deform after being matched;

b. when the sand core 2 is circular, and has two or more layers of sand cores 2 to match with the sand mold 1, the corresponding male pin 3 and the female pin 4 are embedded at the circle center positions of the sand mold 1 and the sand core 2, and the embedded edges of the sand mold 1 and the sand core 2 are the male pin 3 and the female pin 4 distributed in a circular array, so that the matching of the sand mold 1 and the sand core 2 is kept concentric.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.