Shape mold for lockstitch sewing machine shell

Abstract

The utility model relates to the technical field of dies, in particular to a flat seam machine shell shape die which comprises a template, a groove is formed in the upper surface of the template, a convex face is arranged on the lower surface of the template, a set of upper dies and a set of lower dies are arranged on the groove and the convex face respectively, and each upper die is provided with an exhaust structure. The exhaust structure is used for exhausting and reducing the gas pressure in the cavity during forming so as to avoid the formation of air holes; a plurality of shakeout grooves are formed in each lower mold, falling sand is accumulated through the shakeout grooves, due to the arrangement of the shakeout grooves, the phenomenon that sand is scattered after core sand is placed, so that molding sand and the core sand are combined undesirably is avoided, meanwhile, due to the arrangement of the exhaust structure, the gas pressure in a cavity during mold filling can be reduced, and the mold filling efficiency is improved. Molten metal mold filling capacity is improved, formation of air holes is reduced, and casting quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to the outer mold of a flat sewing machine housing. Background Technology

[0002] With the continuous development of industrial production, the application of external molds in manufacturing is becoming increasingly widespread. Especially in fields such as casting and forging, external molds play a crucial role.

[0003] The flat seam molding molds commonly used in the market currently have the following problems during operation:

[0004] 1. Sand falling off at the contact point with the sand mold: During mold use, due to the large contact area between the mold and the sand mold, scratching is likely to occur. This scratching causes the sand mold surface to peel off, resulting in sand falling off. Sand falling off not only affects the appearance quality of the casting but may also lead to dimensional deviations in the casting, increasing the difficulty of subsequent processing;

[0005] 2. High gas pressure inside the mold cavity during filling leads to porosity: During the casting process, when molten metal fills the mold cavity, the gas inside the cavity cannot be discharged in time, resulting in increased gas pressure. This high-pressure gas easily forms pores inside the casting, seriously affecting the strength and density of the casting and reducing product quality.

[0006] Therefore, a mold for the outer casing of a flat sewing machine is needed to improve the above-mentioned problems. Utility Model Content

[0007] The purpose of this utility model is to provide a mold for the outer shape of a flat sewing machine housing to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] The outer mold of the flat sewing machine housing includes a mold plate. The upper surface of the mold plate has a groove and the lower surface has a convex surface. An upper mold and a lower mold are respectively arranged on the groove and the convex surface. Each upper mold is provided with a venting structure to reduce the gas pressure in the mold cavity during molding and avoid the formation of air holes. Each lower mold is provided with several sand drop grooves to collect the fallen sand. The lower end of each upper mold and the upper end of each lower mold are connected to a step.

[0010] As a preferred embodiment of this utility model, the upper mold includes an upper mold body, and a plurality of upper mold cores are connected to the side of the upper mold body.

[0011] As a preferred embodiment of this utility model, the venting structure includes a plurality of venting pin seats, on which venting pins are connected. The plurality of venting pin seats are respectively disposed on the side of a plurality of upper mold cores and at the upper middle position of the upper mold body, and the plurality of venting pin seats are fixedly connected to the plurality of upper mold cores and the upper mold body.

[0012] As a preferred embodiment of this utility model, the lower mold includes a lower mold body, and a plurality of lower mold cores are connected to the side of the lower mold body. The plurality of sand drop grooves are respectively disposed at the connection positions of the plurality of lower mold cores and the lower mold body.

[0013] As a preferred embodiment of this utility model, the connection points between the upper mold, the lower mold, and the step are all provided with R-angles.

[0014] As a preferred embodiment of this utility model, each of the connection points between the upper mold core head and the upper mold body, and each of the connection points between the lower mold core head and the lower mold body, is provided with a radius (R-angle).

[0015] As a preferred embodiment of this utility model, each step is provided with a protruding plate on its end face during installation, and the thickness of the protruding plate on the end face of the step is 0.1-0.15mm.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention features a sand drop trough at the connection between the lower mold body and the lower mold core head. The sand drop trough accumulates the fallen sand, preventing the core sand from scattering and causing poor mixing between the outer molding sand and the core sand. An exhaust structure is provided on the upper mold to discharge the sand mold cavity, sand core, and various gases released from the molten metal. This reduces the gas pressure inside the mold cavity during filling, improves the filling capacity of the molten metal, reduces the formation of pores, and improves the quality of the casting. Attached Figure Description

[0018] Figure 1 This is a first-view perspective perspective view of the present invention;

[0019] Figure 2 This is a second-view perspective perspective view of the present invention;

[0020] Figure 3 This is a top view of the present invention;

[0021] Figure 4 This is a bottom view of the present invention.

[0022] In the diagram: 1. Mold plate; 2. Groove; 3. Upper mold body; 4. Step; 5. Venting pin seat; 6. Venting pin; 7. Upper mold core head; 8. Lower mold body; 9. Lower mold core head; 10. Convex surface; 11. Sand drop groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below with reference to relevant embodiments. Several embodiments of this utility model are given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0025] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figure 1-4 The present invention provides the following technical solution:

[0028] For an example, please refer to... Figure 1 , 2 3 and 4, the outer mold of the flat sewing machine housing, including a mold plate 1, the upper surface of the mold plate 1 is provided with a groove 2 and the lower surface is provided with a convex surface 10. A set of upper molds and a set of lower molds are respectively provided on the groove 2 and the convex surface 10. Each upper mold is provided with an exhaust structure, which reduces the gas pressure in the mold cavity during molding to avoid the formation of air holes. Each lower mold is provided with several sand drop grooves 11, which collect the fallen sand. Each upper mold and each lower mold are connected to a step 4 at the lower end and the upper end of the lower mold.

[0029] The exhaust structure can discharge various gases from the sand mold cavity and sand core, as well as those released from the molten metal, thereby reducing the gas pressure inside the mold cavity during filling, improving the filling capacity of the molten metal, reducing the formation of porosity, and improving the quality of the casting.

[0030] The sand drop trough 11 collects the fallen sand to prevent the core sand from scattering and causing poor mixing between the outer sand and the core sand after placement.

[0031] Please refer to Figure 1 , 2 3. The upper mold includes an upper mold body 3. Several upper mold cores 7 are connected to the side of the upper mold body 3. The venting structure includes several venting pin seats 5. Venting pins 6 are connected to the several venting pin seats 5. The several venting pin seats 5 are respectively located on the side of several upper mold cores 7 and at the upper middle position of the upper mold body 3. The several venting pin seats 5 are fixedly connected to several upper mold cores 7 and the upper mold body 3.

[0032] The venting pin seat 5 and venting pin 6 are located on the side of the upper mold core head 7 and at the upper middle part of the upper mold body 3. When the outer mold is formed, the gas in the middle cavity of the sand mold can be evenly discharged, reducing the gas pressure in the cavity during filling, reducing the formation of air holes, and improving the quality of the casting.

[0033] Please refer to Figure 3 and 4 The lower mold includes a lower mold body 8, and a number of lower mold cores 9 are connected to the side of the lower mold body 8. A number of sand drop grooves 11 are respectively set at the connection positions between the number of lower mold cores 9 and the lower mold body 8.

[0034] The sand drop trough 11 collects the fallen sand, preventing the core sand from scattering and causing poor mixing between the outer and core sands.

[0035] The upper mold, lower mold and step 4 are all provided with R-angle. The connection between each upper mold core head 7 and the upper mold body 3 and the connection between each lower mold core head 9 and the lower mold body 8 are also provided with R-angle.

[0036] The R-angle setting avoids the sand at the bottom of the sand mold being incomplete and the sand mold being poorly released, thus ensuring the quality of the sand mold.

[0037] When each step 4 is installed, its end face protrudes from the mold plate 1, and the thickness of the protrusion at the end face of the step 4 is 0.1-0.15mm.

[0038] The end face of step 4 is 0.1-0.15mm higher than that of mold plate 1 to prevent actual height errors during installation, which could lead to unevenness between the upper and lower mold sand parting surfaces during the casting process.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold for the outer casing of a flat sewing machine, comprising a mold plate (1), wherein a groove (2) is provided on the upper surface of the mold plate (1) and a convex surface (10) is provided on its lower surface, wherein a set of upper molds and a set of lower molds are respectively provided on the groove (2) and the convex surface (10), characterized in that: Each of the upper molds is provided with an exhaust structure, which reduces the gas pressure in the cavity during molding to avoid the formation of air holes. Each of the lower molds is provided with several sand drop troughs (11) to collect the fallen sand. Each upper mold has a step (4) attached to its lower end and each lower mold has a step (4) attached to its upper end.

2. The outer mold for a flat sewing machine housing according to claim 1, characterized in that: The upper mold includes an upper mold body (3), and several upper mold cores (7) are connected to the side of the upper mold body (3).

3. The outer mold for a flat sewing machine housing according to claim 2, characterized in that: The venting structure includes a plurality of venting pin seats (5), on which venting pins (6) are connected. The plurality of venting pin seats (5) are respectively located on the side of the plurality of upper mold cores (7) and at the upper middle position of the upper mold body (3), and the plurality of venting pin seats (5) are fixedly connected to the plurality of upper mold cores (7) and the upper mold body (3).

4. The outer mold for a flat sewing machine housing according to claim 3, characterized in that: The lower mold includes a lower mold body (8), and a plurality of lower mold cores (9) are connected to the side of the lower mold body (8). A plurality of sand drop grooves (11) are respectively set at the connection positions of the plurality of lower mold cores (9) and the lower mold body (8).

5. The outer mold for a flat sewing machine housing according to any one of claims 2-4, characterized in that: The upper mold, lower mold and step (4) are all provided with R-angle.

6. The outer mold for a flat sewing machine housing according to claim 4, characterized in that: Each of the upper mold cores (7) and the upper mold body (3) is provided with an R-angle at the connection point, and each of the lower mold cores (9) and the lower mold body (8) is provided with an R-angle.

7. The outer mold for a flat sewing machine housing according to any one of claims 1-4 and 6, characterized in that: When each step (4) is installed, its end face protrudes from the plate (1), and the thickness of the protrusion at the end face of the step (4) is 0.1-0.15mm.

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