阅读说明：本技术 焦炉炉门顶压筒铸造工艺 (Coke oven door top pressing cylinder casting process ) 是由 马建松 郭小军 于 2021-09-02 设计创作，主要内容包括：本发明公开了一种焦炉炉门顶压筒铸造工艺,属于铸造模具技术领域,置于砂型上顶压筒模腔内的模芯自上而下依次为上定位芯头、芯柱和下定位芯头,上定位芯头和下定位芯头分别与顶压筒模腔两端的上端定位槽及下端定位槽配合；芯柱中部设有台阶、且上下部直径分别与顶压筒内孔的攻丝部分及导向部分一致,确保顶压筒内孔尺寸精度。模芯通过上定位芯头及下定位芯头与砂型的上端定位槽及下端定位槽配合定位,实现模芯在顶压筒模腔内准确定位,提高芯柱相对砂型的位置精度。采用本发明铸出的顶压筒尺寸精度较高,外观质量良好,后序攻丝效果较好,实现了顶压筒毛坯免加工直接攻丝的目的,减少了加工量,提高了生产效率,降低了生产成本。(The invention discloses a coke oven door jacking cylinder casting process, which belongs to the technical field of casting molds.A mold core arranged in a mold cavity of a jacking cylinder on a sand mold sequentially comprises an upper positioning core head, a core column and a lower positioning core head from top to bottom, wherein the upper positioning core head and the lower positioning core head are respectively matched with an upper end positioning groove and a lower end positioning groove at two ends of the mold cavity of the jacking cylinder; the middle part of the core column is provided with a step, and the diameters of the upper part and the lower part of the core column are respectively consistent with the tapping part and the guiding part of the inner hole of the jacking cylinder, so that the dimensional precision of the inner hole of the jacking cylinder is ensured. The mold core is matched and positioned with the upper end positioning groove and the lower end positioning groove of the sand mold through the upper positioning core print and the lower positioning core print, so that the mold core is accurately positioned in the mold cavity of the jacking cylinder, and the position precision of the core column relative to the sand mold is improved. The top pressing barrel cast by the invention has higher dimensional precision, good appearance quality and better subsequent tapping effect, realizes the purpose of directly tapping the blank of the top pressing barrel without processing, reduces the processing amount, improves the production efficiency and reduces the production cost.)

1. The process for casting the jacking cylinder of the coke oven door is characterized by comprising the following steps of:

a sand mold is manufactured in advance by utilizing a mold with a top pressure cylinder model at the edge, and a top pressure cylinder mold cavity is formed at the edge of the sand mold after demolding; the upper end and the lower end of the top pressure cylinder model are respectively provided with a positioning core print, and an upper end positioning groove and a lower end positioning groove are correspondingly formed at the top and the bottom of the sand mould;

the prefabricated mold core is arranged in a mold cavity of the jacking cylinder, the mold core sequentially comprises an upper positioning core print, a core column and a lower positioning core print from top to bottom, and the upper positioning core print and the lower positioning core print can be respectively matched and positioned with an upper end positioning groove and a lower end positioning groove; the middle part of the core column is provided with a step, and the diameters of the upper part and the lower part of the core column are respectively consistent with the inner diameters of a tapping part and a guide part of an inner hole of the jacking cylinder;

and (4) combining the upper box and the lower box for pouring, shakeout and cleaning to obtain a casting blank.

2. The process for casting the jacking cylinder of the coke oven door of the coke oven as claimed in claim 1, wherein: the upper positioning core print comprises a fan-shaped positioning table and a trapezoid positioning table, convex eaves protruding out of the outer circular surface of the core column are arranged on the outer edges of the fan-shaped positioning table and the trapezoid positioning table, and two sides of the small end of the trapezoid positioning table are connected with two ends of the fan-shaped positioning table respectively; the top of the fan-shaped positioning table and the top of the trapezoid positioning table are flush with the top of the sand mold, the large end of the trapezoid positioning table faces the outer side of a top pressing barrel mold cavity of the sand mold, and the edge of the fan-shaped positioning table and the edges of the two sides of the trapezoid positioning table are matched with the inner wall of the upper end positioning groove.

3. The process for casting the jacking cylinder of the coke oven door of the coke oven as claimed in claim 2, wherein: the lower surfaces of the fan-shaped positioning table and the trapezoidal positioning table are planes and are used for being attached to the bottom surface of the upper end positioning groove.

4. The process for casting the jacking cylinder of the coke oven door of the coke oven as claimed in claim 2, wherein: transition sections which are parallel to each other are arranged between the two sides of the small end of the trapezoid positioning table and the two ends of the fan-shaped positioning table, and the distance between the two transition sections is smaller than the diameter of the fan-shaped positioning table.

5. The process for casting the jacking cylinder of the coke oven door of the coke oven as claimed in claim 2, wherein: the lower positioning core print comprises a rectangular positioning table and a semicircular positioning table, the rectangular positioning table corresponds to the trapezoidal positioning table of the upper positioning core print, the bottom surface of the semicircular positioning table protrudes out of the bottom surface of the rectangular positioning table, and the outer circular surface of the semicircular positioning table is matched with the outer circular surface of the core column; two side edges of the rectangular positioning table are tangent with two ends of the semicircular positioning table.

6. The process for casting the jacking cylinder of the coke oven door of the coke oven as claimed in claim 1, wherein: the fit clearance between the upper positioning core print and the lower positioning core print of the mold core and the mold cavity of the top pressing barrel is 0.2 mm.

7. The process for casting the top cylinder of the coke oven door according to any one of claims 1 to 6, wherein: the upper positioning core head, the core column and the lower positioning core head of the mold core are integrally manufactured and formed by precoated sand.

8. The process for casting the jacking cylinder of the coke oven door of the claim 7, which is characterized in that: the mold core is made of a hot core box through a core shooter.

Technical Field

The invention belongs to the technical field of casting molds, and particularly relates to a casting process of a top pressing barrel of a coke oven door.

Background

A circle of top pressure barrel for mounting a top pressure rod is designed around a coke oven door, a solid semicircle is cast, then drilling and tapping are carried out, the lower part of the top pressure barrel is provided with a guide hole, a threaded hole at the upper part is provided with a screw plug, the top pressure rod with a spring sleeved outside is arranged in the guide hole, the upper part of the top pressure rod penetrates through the screw plug, the upper end of the top pressure rod extends to the outside of the screw plug, the upper end of the top pressure rod is matched with a fastening nut, the lower end of the top pressure rod is matched with a knife edge, and the shoulder of the top pressure rod bears important tasks of sealing, adjusting and fixing the coke oven. In actual production, the external part of the existing top pressure cylinder after being cast and formed is a blank surface, and an inner hole is formed by drilling holes through a drilling machine.

In order to reduce the processing amount of the top pressure barrel, the inner hole of the top pressure barrel is changed from a machining process to a casting process, and the inner hole is directly cast. However, because the inner hole of the top pressure cylinder is divided into two parts, the upper half part needs to be subjected to subsequent tapping to form a threaded hole, the lower half part is a guide hole, and the dimensional tolerance of the tapped part is 52.8₀ ^0.55The dimensional tolerance of the guide part is 53₀ ⁺¹And the verticality deviation of the inner hole is not more than 1 mm. In view of the high requirement of the size precision of the top pressure cylinder and the strict requirements on the diameter and the verticality, the existing die has more unqualified products.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a process for casting the top pressure cylinder of the coke oven door, aiming at overcoming the defects of the prior art, the process improvement of changing the inner hole of the top pressure cylinder from drilling to casting hole can be realized, the casting precision is ensured, the blank surface of the casting hole is directly tapped, and the subsequent processing amount is reduced.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a process for casting a top pressing barrel of a coke oven door comprises the following steps:

a sand mold is manufactured in advance by utilizing a mold with a top pressure cylinder model at the edge, and a top pressure cylinder mold cavity is formed at the edge of the sand mold after demolding; the upper end and the lower end of the top pressure cylinder model are respectively provided with a positioning core print, and an upper end positioning groove and a lower end positioning groove are correspondingly formed at the top and the bottom of the sand mould;

the prefabricated mold core is arranged in a mold cavity of the jacking cylinder, the mold core sequentially comprises an upper positioning core print, a core column and a lower positioning core print from top to bottom, and the upper positioning core print and the lower positioning core print can be respectively matched and positioned with an upper end positioning groove and a lower end positioning groove; the middle part of the core column is provided with a step, and the diameters of the upper part and the lower part of the core column are respectively consistent with the inner diameters of a tapping part and a guide part of an inner hole of the jacking cylinder;

and (4) combining the upper box and the lower box for pouring, shakeout and cleaning to obtain a casting blank.

Preferably, the upper positioning core print comprises a fan-shaped positioning table and a trapezoid positioning table, convex eaves protruding out of the outer circular surface of the core column are arranged on the outer edges of the fan-shaped positioning table and the trapezoid positioning table, and two sides of the small end of the trapezoid positioning table are respectively connected with two ends of the fan-shaped positioning table; the top of the fan-shaped positioning table and the top of the trapezoid positioning table are flush with the top of the sand mold, the large end of the trapezoid positioning table faces the outer side of a top pressing barrel mold cavity of the sand mold, and the edge of the fan-shaped positioning table and the edges of the two sides of the trapezoid positioning table are matched with the inner wall of the upper end positioning groove.

Preferably, the lower surfaces of the fan-shaped positioning table and the trapezoid positioning table are planes and are used for being attached to the bottom surface of the upper end positioning groove.

Preferably, mutually parallel transition sections are arranged between the two sides of the small end of the trapezoidal positioning table and the two ends of the fan-shaped positioning table, and the distance between the two transition sections is smaller than the diameter of the fan-shaped positioning table.

Preferably, the lower positioning core print comprises a rectangular positioning table and a semicircular positioning table, the rectangular positioning table corresponds to the trapezoidal positioning table of the upper positioning core print, the bottom surface of the semicircular positioning table protrudes out of the bottom surface of the rectangular positioning table, and the outer circular surface of the semicircular positioning table is matched with the outer circular surface of the core column; two side edges of the rectangular positioning table are tangent with two ends of the semicircular positioning table.

Preferably, the fit clearance between the upper positioning core print and the lower positioning core print of the mold core and the mold cavity of the jacking cylinder is 0.2 mm.

Preferably, the upper positioning core head, the core column and the lower positioning core head of the mold core are integrally manufactured and molded by precoated sand.

Preferably, the mold core is made of a hot core box through a core shooter.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the core positioning device has the advantages that the upper positioning core print and the lower positioning core print of the core are matched and positioned with the upper end positioning groove at the top and the lower end positioning groove at the bottom of the sand mold, so that the core is accurately positioned in the pressing cylinder mold cavity on the sand mold, and the position precision of the core column relative to the sand mold is improved; the outer diameter of the core column is consistent with the diameter of the inner hole of the top pressure barrel, so that the size precision of the inner hole of the top pressure barrel is ensured, and the processing amount is reduced. The top pressing barrel cast by the invention has higher dimensional precision, good appearance quality and better subsequent tapping effect, realizes the purpose of directly tapping the blank of the top pressing barrel without processing, improves the production efficiency and reduces the production cost.

Drawings

Fig. 1 is a schematic view of a mold core structure of a top pressure cylinder for casting in one embodiment of the invention;

FIG. 2 is a view showing a state of use of the mold core of FIG. 1;

FIG. 3 is a front view of the mold core of FIG. 2;

FIG. 4 is a right side view of the mold core of FIG. 3;

FIG. 5 is a bottom view of the mold core of FIG. 4;

FIG. 6 is a schematic view of the position of the top pressure cylinder on the oven door body;

in the figure: 00-sand mold, 01-top pressure cylinder mold cavity; 1-mold core, 11-upper positioning core head, 110-sector positioning table, 111-trapezoid positioning table and 112-transition section; 12-lower positioning core print, 121-rectangular positioning table, 122-semicircular positioning table; 13-stem, 130-step; 2-top pressure cylinder, 3-top pressure rod, 4-knife edge, 5-spring, 6-plug screw, 7-fastening nut, 8-furnace door body and 9-web plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly and completely understood, the technical solutions in the embodiments of the present invention are described below with reference to the accompanying drawings and specific embodiments, 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. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in figures 1 and 2, the process for casting the top pressing barrel of the coke oven door provided by the invention comprises the following steps:

a mold with a top pressure cylinder mold at the edge is used for manufacturing the sand mold 00 in advance, and a top pressure cylinder mold cavity 01 is formed at the edge of the sand mold 00 after demolding; the upper end and the lower end of the top pressure cylinder model are respectively provided with a positioning core print, and an upper end positioning groove and a lower end positioning groove are correspondingly formed at the top and the bottom of the sand mould 00;

the prefabricated mold core 1 is installed in a mold cavity 01 of a jacking cylinder, the mold core 1 sequentially comprises an upper positioning core print 11, a core column 13 and a lower positioning core print 12 from top to bottom, and the upper positioning core print 11 and the lower positioning core print 12 can be respectively matched and positioned with an upper end positioning groove and a lower end positioning groove; the middle part of the core column 13 is provided with a step 130, and the diameters of the upper part and the lower part of the core column 13 are respectively consistent with the inner diameters of a tapping part and a guiding part of an inner hole of the top pressure cylinder 2;

and (4) combining the upper box and the lower box for pouring, shakeout and cleaning to obtain a casting blank.

According to the technical scheme, the upper positioning core print and the lower positioning core print are utilized to realize the accurate positioning of the mold core in the mold cavity of the jacking cylinder, the mold core can be prevented from moving up and down, and the size precision of the mold core is ensured.

In an embodiment of the present invention, as shown in fig. 1-5, the upper positioning core 11 includes a sector positioning stage 110 and a trapezoid positioning stage 111, outer edges of the sector positioning stage 110 and the trapezoid positioning stage 111 are both provided with a convex brim protruding from an outer circumferential surface of the core column 13, and two sides of a small end of the trapezoid positioning stage 111 are respectively connected to two ends of the sector positioning stage 110; the tops of the fan-shaped positioning table 110 and the trapezoidal positioning table 111 are flush with the top of the sand mold 00, the large end of the trapezoidal positioning table 111 faces the outer side of the top pressing cylinder mold cavity 01 of the sand mold 00, and the edge of the fan-shaped positioning table 110 and the edges of the two sides of the trapezoidal positioning table 111 are matched with the inner wall of the upper end positioning groove. The fan-shaped positioning table and the trapezoid positioning table are matched for positioning, so that the mold core can be prevented from rotating while being positioned, and the reliable positioning of the mold core is ensured.

For convenience of manufacturing and installation, as shown in fig. 4, the lower surfaces of the sector positioning table 110 and the trapezoid positioning table 111 are flat and are used for being attached to the bottom surface of the upper end positioning groove.

As a preferable structure, transition sections 112 parallel to each other are arranged between two sides of the small end of the trapezoid positioning table 111 and two ends of the sector positioning table 110, and the distance between the two transition sections 112 is smaller than the diameter of the sector positioning table 110. By adopting the structure, the degree of freedom of the mold core in the circumferential direction can be controlled.

In an embodiment of the present invention, as shown in fig. 1 to 5, the lower positioning core print 12 includes a rectangular positioning stage 121 and a semicircular positioning stage 122, the rectangular positioning stage 121 corresponds to the trapezoidal positioning stage 111 of the upper positioning core print 11, the bottom surface of the semicircular positioning stage 122 protrudes from the bottom surface of the rectangular positioning stage 121, and the outer circular surface of the semicircular positioning stage 122 is matched with the outer circular surface of the core print 13; two side edges of the rectangular positioning table 121 are tangent to two ends of the semicircular positioning table 122. In order to facilitate the positioning of the lower positioning core head in the lower end positioning groove, the bottom of the lower end positioning groove is provided with a pit corresponding to the semicircular positioning table and a rectangular groove matched with the rectangular positioning table, so that the axial movement and the circumferential rotation of the mold core are avoided.

In order to improve the accuracy of the positioning of the mold core, the fit clearance between the upper positioning core print 11 and the lower positioning core print 12 of the mold core 1 and the mold cavity 01 of the top pressing barrel is 0.2 mm.

During specific manufacturing, the upper positioning core print 11, the core column 13 and the lower positioning core print 12 of the mold core 1 are integrally manufactured and molded by precoated sand; the mold core is made of a hot core box by a core shooter. The mold core made of the precoated sand has the advantages of high size precision, high temperature resistance, high strength, no need of brushing and the like, and the mold core made of the hot core box and the core shooter can be produced in batch, so that the production efficiency and the quality of the mold core are improved, and the size precision of the jacking cylinder is further ensured.

In the specific process of manufacturing the sand mold, the mold cavity 01 of the top pressure barrel is matched with a top pressure barrel model at the edge of the mold, and positioning heads matched with the shapes of the upper positioning core print 11 and the lower positioning core print 12 are respectively arranged at the upper end and the lower end of the top pressure barrel model. When the sand mold is manufactured, a top pressure cylinder mold cavity is formed by a top pressure cylinder model at the edge of the mold, positioning heads are respectively prefabricated at the upper end and the lower end of the top pressure cylinder model and are respectively consistent with the upper positioning core head and the lower positioning core head of the mold core in shape and used for positioning the mold core at the later stage.

The top pressure cylinders on two sides of the furnace door are all cast by adopting the invention, drilling processing is avoided, direct tapping forming is carried out, the processing time of each product is reduced by 370 minutes, the processing amount of all the top pressure cylinders of a single furnace door is reduced from 260.55kg to 31.02kg, and the processing amount of the single furnace door is reduced by 229.53 kg. The invention greatly reduces the labor amount of workers, improves the working efficiency and accelerates the working progress.

In conclusion, the double-core-head coated sand core applied in the invention has the advantages of simple and compact structure and high casting and positioning precision, and the upper positioning core head and the lower positioning core head are adopted for positioning, so that the measurement is not needed after core setting, and the working efficiency is high; the verticality of the lower core is ensured, so that the cast inner hole blank surface can be directly tapped, and the processing amount is reduced; the invention realizes that the inner hole of the top pressure cylinder is drilled to cast, thereby saving a large amount of processing cost, improving the production efficiency and reducing the production cost.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.