Deep groove precoated sand core hot-pressing die

Abstract

The utility model relates to the technical field of precoated sand molds, in particular to a deep groove precoated sand core hot-pressing mold which comprises an upper mold, a lower mold, an insert I, an insert II and an insert III, the tail end of the first boss is provided with shape following structures for forming a left mold and a right mold, the first insert for forming the V-shaped groove is arranged between the two shape following structures, and the first insert is driven by an air cylinder to move horizontally and can be inserted into the upper mold from the side face; an insert II which is parallel to the boss I and is used for forming the deep groove II is also fixed on the upper die through a screw; the lower die is provided with a lower die cavity, a second boss for forming the fourth deep groove is arranged on the side face of the lower die cavity, and the third insert for forming the third deep groove is fixed to the bottom of the lower die cavity through a screw. The sand core can be formed at a time, and a finished product which is smooth in surface and not prone to being broken can be obtained through process control.

Description

Technical Field

[0001] This utility model relates to the field of coated sand mold technology, and in particular to a deep groove coated sand core hot pressing mold. Background Technology

[0002] Coated sand casting is an important casting process. Its most advanced feature is that a pre-made mold core can be placed in the mold cavity during mold closing. After casting, the mold core, made of coated sand, can be directly crushed and cleaned.

[0003] Now we need to make such Figure 1 The mold core shown is complex in structure and has deep grooves. Because the raw material, coated sand, is easily broken before drying, the mold core cannot be spliced ​​like a wax model and must be formed in one piece. In addition, coated sand casting is used because of its simple process and low cost. Therefore, designing a coated sand mold that can fill the mold fully, form it in one piece, and make the mold core surface smooth and not easily broken is the problem that needs to be solved in this case. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a deep groove coated sand core hot pressing mold. This mold is made by using a large draft angle and multiple inserts, thereby reducing the difficulty of mold making and achieving one-time forming of the mold core.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a deep groove coated sand core hot pressing mold, including an upper mold, a lower mold, and insert one, insert two, and insert three. The upper mold is provided with a boss one with a U-shaped cross section that can form the deep groove one, and at the end of the boss one, there are conformal structures for forming left and right shapes. Between these two conformal structures, insert one for forming the V-shaped groove is provided. Insert one is driven by a cylinder to move and can be inserted into the upper mold from the side. The upper mold is also fixed with insert two for forming the deep groove two, which is parallel to the boss one, by screws. The lower mold is provided with a lower mold cavity. The side of the lower mold cavity is provided with a boss two for forming the deep groove four, and the bottom of the lower mold cavity is fixed with insert three for forming the deep groove three by screws.

[0006] Preferably, the upper mold is provided with guide posts at both ends, and the lower mold is provided with guide holes corresponding to the guide posts.

[0007] Preferably, the lower mold is provided with a positioning pile to improve the mold closing accuracy, and the upper mold is provided with a positioning groove that fits into the positioning pile.

[0008] Preferably, the draft angle of the second insert is 2°.

[0009] Preferably, both the upper mold and the lower mold are provided with a large number of vent holes.

[0010] Preferably, the mold consists of two parts: insert one, insert two, insert three, boss one, boss two, and other conformal structures, which are arranged symmetrically on the left and right sides.

[0011] Preferably, the upper mold side is provided with a guide groove that can be fitted with the insert tail seat.

[0012] Preferably, the lower mold is provided with a mounting groove for fitting and mounting the sand-shooting head.

[0013] The beneficial effects of this utility model are as follows: A hot pressing mold for deep groove coated sand cores includes an upper mold, a lower mold, and inserts one, two, and three. The upper mold is provided with a U-shaped boss that can form the first deep groove, and at the end of the boss, there are conformal structures for forming left and right shapes. Between these two conformal structures, insert one for forming the V-shaped groove is provided. Insert one is driven by a cylinder to move and can be inserted into the upper mold from the side. Insert two for forming the second deep groove, which is parallel to the boss one, is also fixed to the upper mold by screws. The lower mold is provided with a lower mold cavity, and the side of the lower mold cavity is provided with a boss two for forming the fourth deep groove. Insert three for forming the third deep groove is fixed to the bottom of the lower mold cavity by screws. This utility model can form sand cores in one step, and through process control, a finished product with a smooth surface and not easily broken can be obtained. Attached Figure Description

[0014] Figure 1 This is a three-dimensional view of the sand core to be formed according to this utility model;

[0015] Figure 2 This is a three-dimensional view of the upper mold;

[0016] Figure 3 This is a three-dimensional view of the lower mold;

[0017] Figure 4 This is a perspective view of the insert one;

[0018] Figure 5 This is a perspective view of the second insert;

[0019] Figure 6 This is a perspective view of the inlay three.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1 – Sand core, 101 – Deep groove one, 102 – Deep groove two, 103 – Left shape, 104 – Right shape, 105 – V-groove, 106 – Deep groove three, 107 – Deep groove four, 2 – Upper mold, 201 – Boss one, 202 – Guide groove, 3 – Lower mold, 301 – Boss two, 302 – Installation groove, 4 – Insert one, 5 – Insert two, 6 – Insert three, 7 – Guide post, 8 – Guide hole, 9 – Positioning pile, 10 – Positioning groove. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the present invention.

[0023] like Figure 1 As shown, the pair of symmetrical sand cores to be produced in this embodiment, taking one of the sand cores as an example, can be regarded as the grooves and shapes on the four sides of a cuboid. The final product has a complex structure, with deep grooves on all four sides, and these shapes and deep grooves extend towards each other, so that the thickness of any boundary wall of the sand core is not much different.

[0024] Taking the right-side sand core 1 as an example, the sand core 1 is generally shaped like a near-cubic prism, with the larger end being the rear and the smaller end the front. The upper surface of the cuboid has a U-shaped deep trench 101 and a deep trench 102 that is dug downwards to a depth of 91% of the cuboid's thickness. The deep trench 102 and the deep trench 101 are arranged side-by-side. The larger end of the deep trench 101 extends to the rear end face and is open. The bottom of the deep trench 102 has a through hole extending to the lower surface. The upper surface of the cuboid is close to... The front end is provided with a left shape 103, a right shape 104, and a V-shaped groove 105 in the middle. The V-shaped opening of the V-shaped groove 105 faces the left front. The bottom of the sand core cuboid is provided with a deep groove three 106 with an upward excavation cross section that is semi-circular and a longitudinal cross section that is vase-shaped (necked in the middle, with both ends extending outward, one end being cup-shaped and the other end being funnel-shaped). The right side of the cuboid is provided with a deep groove four 107. The deep groove four 107 is open on the right side and bottom of the cuboid. The deep groove four 107 can be regarded as a rectangle with a width that varies with the shape, scanned along a Z-shaped curve.

[0025] To form the aforementioned sand core in a single sand injection process, the hot press mold used in this embodiment is as follows: Figure 2-6As shown, the system includes an upper mold 2, a lower mold 3, and inserts 4, 5, and 6. The upper mold 2 is provided with a U-shaped boss 201 that can form the deep groove 101. At the end of the boss 201, there are conformal structures that form the left shape 103 and the right shape 104. Between these two conformal structures, insert 4 forms the V-shaped groove 105. Insert 4 is driven by a cylinder to move and can be inserted into the upper mold 2 from the side. The upper mold 2 is also fixed with screws to insert 5, which forms the deep groove 102, parallel to the boss 201. The lower mold 3 is provided with a lower mold cavity. The side of the lower mold cavity is provided with a boss 301 that forms the deep groove 107. The bottom of the lower mold cavity is fixed with screws to insert 6, which forms the deep groove 106.

[0026] The insert 4, insert 5, and insert 6 are manufactured separately and then installed with the mold, which reduces the difficulty and cost of mold manufacturing. Furthermore, they can be replaced after damage or wear, thus extending the mold's lifespan.

[0027] To facilitate mold closing and improve the accuracy and sealing of the mold cavity after mold closing, the upper mold 2 is provided with guide posts 7 at both ends, and the lower mold 3 is provided with guide holes 8 corresponding to the guide posts 7; the lower mold 3 is provided with positioning pins 9 to improve the mold closing accuracy, and the upper mold 2 is provided with positioning grooves 10 that fit into the positioning pins 9.

[0028] Because the grooves of the sand core 1 are relatively deep, the bosses, inserts and molding draft angles of each groove are all greater than 2°. Among them, the draft angle of the second insert 5 is 2°, and a frustum is provided at the top to form the bottom through hole of the second deep groove 102.

[0029] The mold in this embodiment can be formed in one step, as shown below. Figure 1 As shown in the diagram, there are two symmetrical sand cores 1. Therefore, the upper mold 2 and the lower mold 3 are both symmetrical structures. The insert 1 4, insert 2 5, insert 3 6, boss 1 201, boss 2 301 and other conformal structures are two of each on the upper mold 2 and the lower mold 3, and are arranged symmetrically on the left and right.

[0030] The lower mold 3 has two mounting grooves 302 on its side for mounting sand injection heads, which can simultaneously inject sand into two mold cavities, thereby improving the filling efficiency.

[0031] Both the upper mold 2 and the lower mold 3 are provided with a large number of vent holes; during sand injection, these vent holes are blocked by the ejector rod, and after pressure holding and solidification, the ejector rod is withdrawn to release the vent.

[0032] During operation, the upper mold 2 moves downward to close with the lower mold 3, the insert 4 moves horizontally and fits into the upper mold 2, and then coated sand with a pressure of 0.5 MPa is injected into the mold cavity. The sand particles of the coated sand are not less than 100 mesh. The mold is heated and pressurized and kept under pressure for a certain period of time. After the sand core has solidified and has a certain strength, the mold is opened and the core is removed.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and for the convenience of describing the technical solution, the front, back, left, right, top, middle, and bottom orientations are based on the accompanying drawings and are not a limitation on the protection scope of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the essence and scope of the technical solution of this utility model.

Claims

1. A deep-groove coated sand core hot pressing mold, characterized in that: The sand core has the following structure: it is a near-rectangular prism, with the larger end being the rear and the smaller end being the front. The upper surface of the prism has a U-shaped deep groove (101) and a deep groove (102) with a depth reaching 91% of the thickness of the prism. The deep groove (102) and the deep groove (101) are arranged side by side. The larger end of the deep groove (101) extends to the rear end face and is open. The bottom of the deep groove (102) has a through hole that extends to the bottom surface. The upper surface of the cuboid is provided with a left shape (103), a right shape (104), and a V-shaped groove (105) in the middle near the front end. The V-shaped opening of the V-shaped groove (105) faces the left front. The bottom of the sand core cuboid is provided with a deep groove three (106) with an upward excavation cross section that is semi-circular and a longitudinal section that is vase-shaped. The right side of the cuboid is provided with a deep groove four (107). The deep groove four (107) is open on the right side and bottom of the cuboid. The deep groove four (107) can be regarded as a rectangle with a width that varies with the shape, scanned along a Z-shaped curve. The mold for forming the sand core includes an upper mold, a lower mold, and inserts one, two, and three. The upper mold is provided with a U-shaped boss that can form the first deep groove. At the end of the boss, there are conformal structures for forming the left and right shapes. Between these two conformal structures, insert one is provided to form the V-shaped groove. Insert one is driven by a cylinder to move and can be inserted into the upper mold from the side. Insert two, which forms the second deep groove, is also fixed to the upper mold with screws. The lower mold is provided with a lower mold cavity. The side of the lower mold cavity is provided with a boss two for forming the fourth deep groove. Insert three, which forms the third deep groove, is fixed to the bottom of the lower mold cavity with screws.

2. The deep groove coated sand core hot pressing mold according to claim 1, characterized in that: The upper mold has guide posts at both ends, and the lower mold has guide holes corresponding to the guide posts.

3. The deep groove coated sand core hot pressing mold according to claim 1, characterized in that: The lower mold is provided with a positioning pile to improve the mold closing accuracy, and the upper mold is provided with a positioning groove that fits into the positioning pile.

4. The deep groove coated sand core hot pressing mold according to claim 1, characterized in that: The draft angle of the second insert is 2°.

5. The deep groove coated sand core hot pressing mold according to claim 1, characterized in that: Both the upper mold and the lower mold are provided with a large number of vent holes.

6. The deep groove coated sand core hot pressing mold according to claim 1, characterized in that: The upper mold side is provided with a guide groove that can be fitted with the insert tail seat.

7. The deep groove coated sand core hot pressing mold according to claim 1, characterized in that: The lower mold is provided with a mounting groove for fitting and mounting the sand-shooting head.

Images