Pin core mold fixing structure for piston casting

Abstract

The invention discloses a pin core mold fixing structure for piston casting, relates to the technical field of piston casting, and solves the technical problems that in the existing piston casting process, a pin core mold and an exterior mold are directly fixed through screws, and due to the abrasion clearance between equipment and the mold, the mold is not matched in place, and pin hole flash is likely to be generated. The screw fixation between the exterior mold and the pin core mold is changed into the fixation through the fixing mechanism, the position fixation of the pin core mold is changed into the fixation of the position of the pressing plate with a larger area through the contact of the pressing plate and the protruding block on the surface of the pin core mold, the fixation position is easier to determine, and operation is convenient; the position of the pin core mold is further relative to the required position, the follow-up middle-sized mold can automatically adjust the position of the pin core mold according to the placement position, contact between the pin core mold and the middle-sized mold is guaranteed, the position of the middle-sized mold can be further fixed through the fixing spring, and the phenomenon that when casting materials are poured, a gap exists between the pin core mold and the middle-sized mold, and consequently flash is caused is avoided.

Description

Technical Field

[0001] The invention belongs to the field of piston casting, relates to a pin hole casting technology, and specifically is a pin core mold fixing structure used for piston casting. Background Art

[0002] Piston casting is generally done by clamping two outer molds and a medium-sized mold through a clamping structure, usually on the four sides of the outer mold, so that the two outer molds fit completely together, and then pouring the casting material through the holes between the molds. After the casting material cools down, the piston blank can be taken out, polished and processed, and the inside of the mold cleaned.

[0003] Pin holes of a certain size need to be opened on both sides of the piston. The cast piston generally forms pin holes directly in the piston blank through the contact between the pin core mold and the medium-sized mold. The existing mold generally uses screws to fix the pin core mold on the outer mold. However, due to the long-term use of the medium-sized mold or incomplete cleaning of the outer mold, the distance between the pin core mold and the medium-sized mold will increase or the length that the pin core mold can be inserted into the outer mold will be shortened, resulting in improper fit between the pin core mold and the medium-sized mold. As a result, during the casting process, the casting material overflows from the edge of the pin hole of the mold to form flash, which may cause the grinding tool to break during the subsequent processing of the piston blank, affecting the subsequent processing process.

[0004] To this end, the present invention provides a pin core mold fixing structure for piston casting. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a pin core mold fixing structure for piston casting, which solves the problem that the pin core mold is directly fixed to the outer mold with screws in the existing piston casting process, and the mold is not properly matched due to the wear clearance between the equipment and the mold, which easily generates flash on the pin hole.

[0006] To achieve the above object, according to an embodiment of the first aspect of the present invention, a pin core mold fixing structure for piston casting is provided, comprising: an outer mold and a pin core mold, the outer mold and the pin core mold are detachably connected, a fixing mechanism is arranged between the outer mold and the pin core mold, and the fixing mechanism comprises:

[0007] A pressing plate, the pressing plate is fitted with the surface of the pin core mold, a protruding block is fixedly connected to the surface of the pin core mold, and the surface of the pressing plate is in contact with the surface of the protruding block;

[0008] A plurality of fixing rods, each of which is threadedly connected to the outer mold, and the fixing rods are symmetrically arranged relative to the center of the outer mold, and a plurality of through grooves are opened on the surface of the pressing plate, and the through grooves are adapted to the fixing rods;

[0009] A plurality of fixing springs are sleeved on the surface of the fixing rod, and the cross section of the fixing spring is rectangular. One end of the fixing spring contacts the side of the pressing plate away from the protruding block.

[0010] Optionally, two sliding grooves are provided on the surface of the pressure plate, and the two sliding grooves are symmetrically arranged relative to the pin core mold.

[0011] Optionally, two sliding rods are threadedly connected to one side of the outer mold close to the pressure plate, and the sliding rods are adapted to the sliding grooves.

[0012] Optionally, the sliding rod and the fixed rod both include a connecting portion, a sliding portion and a protruding portion, and the length of the sliding rod is shorter than that of the fixed rod.

[0013] Optionally, a thread is provided on the surface of the connection portion, four connection grooves are provided on a side of the outer mold close to the pressing plate, and a spiral groove adapted to the thread is provided inside the connection groove.

[0014] Optionally, the sliding parts are respectively matched with the through groove and the sliding groove, and the surfaces of the sliding parts are smooth.

[0015] Optionally, the diameter of the protrusion is larger than the diameter of the sliding portion, wherein the diameter of the protrusion on the fixing rod is larger than the outer diameter of the fixing spring.

[0016] Optionally, two connecting rods are fixedly connected to a side of the outer mold away from the pressure plate, the two connecting rods are symmetrically arranged on the surface of the outer mold, and the surfaces of the connecting rods away from the outer mold are both provided with threads.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the screw fixation between the outer mold and the pin core mold is converted into fixation through a fixing mechanism, and the position fixation of the pin core mold is converted into fixation of the position of a larger pressure plate through the contact between the pressure plate and the protruding block on the surface of the pin core mold, which makes it easier to determine the fixed position and convenient to operate, and the position between the pressure plate and the outer mold is further limited by a fixing spring and a fixing rod, so that the pin core mold can be directly pressed to a certain position inside the outer mold, and due to the presence of the protruding block, the position of the pin core mold is further relative to the required position, and the subsequent medium-sized mold can autonomously adjust the position of the pin core mold according to the placement position to ensure the contact between the two, and the position of the medium-sized mold can be further fixed by a fixing spring to avoid a gap between the pin core mold and the medium-sized mold when pouring the casting material, resulting in flash. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural stereogram of the present invention;

[0019] Figure 2 It is a three-dimensional structural cross-sectional view of the connecting rod of the present invention;

[0020] Figure 3 It is a structural breakdown diagram of the present invention.

[0021] In the figure: 1. External mold; 2. Pin core mold;

[0022] 31. Pressing plate; 32. Protruding block; 33. Fixing rod; 34. Through slot; 35. Fixing spring;

[0023] 41. Sliding groove; 42. Sliding rod; 43. Connecting groove;

[0024] 51. Connecting rod. DETAILED DESCRIPTION

[0025] The technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1-3 As shown, a pin core mold fixing structure for piston casting includes an outer mold 1 and a pin core mold 2, wherein the outer mold 1 and the pin core mold 2 are detachably connected;

[0027] It should be noted that the outer mold 1 and the pin core mold 2 are both halves of the outer mold 1 required for piston casting, and the outer mold 1 has a medium-sized mold that matches each other;

[0028] A fixing mechanism is provided between the outer mold 1 and the pin core mold 2, and the fixing mechanism comprises:

[0029] A pressing plate 31, wherein the pressing plate 31 is fitted with the surface of the pin core mold 2, a protruding block 32 is fixedly connected to the surface of the pin core mold 2, and the surface of the pressing plate 31 is in contact with the surface of the protruding block 32;

[0030] A plurality of fixing rods 33, each of which is threadedly connected to the outer mold 1, and the fixing rods 33 are symmetrically arranged relative to the center of the outer mold 1, and a plurality of through grooves 34 are opened on the surface of the pressing plate 31, and the through grooves 34 are adapted to the fixing rods 33;

[0031] A plurality of fixing springs 35, each of which is sleeved on the surface of the fixing rod 33, the cross section of each fixing spring 35 is rectangular, and one end of each fixing spring 35 is in contact with the surface of the pressing plate 31;

[0032] It should be noted that the pitch of a single fixed spring 35 is small, and the number of turns of the fixed spring 35 is small;

[0033] The pin core mold 2 fixing structure used for piston casting, in actual application, converts the screw fixing between the outer mold 1 and the pin core mold 2 into fixing through a fixing mechanism, and converts the position fixing of the pin core mold 2 into fixing of the position of a larger area of ​​the pressure plate 31 through the contact between the pressure plate 31 and the protruding block 32 on the surface of the pin core mold 2, which makes it easier to determine the fixed position and convenient to operate, and the position between the pressure plate 31 and the outer mold 1 is further limited by the fixing spring 35 and the fixing rod 33, so that the pin core mold 2 can be directly pressed to a certain position inside the outer mold 1, and due to the existence of the protruding block 32, the position of the pin core mold 2 is further relative to the required position, and the subsequent medium-sized mold can autonomously adjust the position of the pin core mold 2 according to the placement position to ensure the contact between the two, and the position of the medium-sized mold can be further fixed by the fixing spring 35 to avoid the gap between the pin core mold 2 and the medium-sized mold when pouring the casting material, resulting in flash;

[0034] In some specific embodiments, the surface of the pressing plate 31 is provided with two sliding grooves 41, the two sliding grooves 41 are symmetrically arranged relative to the pin core mold 2, and two sliding rods 42 are threadedly connected to one side of the outer mold 1 close to the pressing plate 31, and the sliding rods 42 are adapted to the sliding grooves 41;

[0035] In a further embodiment, the sliding rod 42 and the fixed rod 33 both include a connecting portion, a sliding portion and a protruding portion, and the length of the sliding rod 42 is shorter than that of the fixed rod 33, the surface of the connecting portion is provided with a thread, four connecting grooves 43 are provided on the side of the outer mold 1 close to the pressing plate 31, and a spiral groove adapted to the thread is provided inside the connecting groove 43, the sliding portions are respectively adapted to the through groove 34 and the sliding groove 41, and the surface of the sliding portion is smooth, the diameter of the protruding portion is larger than the diameter of the sliding portion, wherein the diameter of the protruding portion on the fixed rod 33 is larger than the outer diameter of the fixed spring 35;

[0036] In some specific embodiments, two connecting rods 51 are fixedly connected to one side of the outer mold 1 away from the pressing plate 31, and the two connecting rods 51 are symmetrically arranged on the surface of the outer mold 1, and the surfaces of the connecting rods 51 away from the outer mold 1 are both provided with threads;

[0037] The working principle of the present invention is as follows: first, the pin core mold 2 is inserted into the outer mold 1, and then the pressure plate 31 is fitted with the convex block on the surface of the pin core mold 2, and the through groove 34 and the sliding groove 41 on the surface of the pressure plate 31 are placed on the surface of the outer mold 1 corresponding to the connecting groove 43 on the surface of the outer mold 1, and the fixing spring 35 is sleeved on the surface of the fixing rod 33, and the fixing rod 33 passes through the through groove 34 and is fixed in position with the connecting groove 43 by a thread, and one end of the fixing spring 35 contacts the surface of the pressure plate 31, and the pressure plate 31 drives the pin core mold 2 to move toward the inner part of the outer mold 1 again. At this time, the positions of the pressure plate 31 and the pin core mold 2 are fixed, and then the sliding rod 42 is fixed on the surface of the outer mold 1 through the sliding groove 41, and the outer mold 1 and the medium-sized mold on the other side are installed to cast the piston.

[0038] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A pin core mold fixing structure for piston casting, characterized in that: include: An outer mold (1) and a pin core mold (2), wherein the outer mold (1) and the pin core mold (2) are detachably connected, and a fixing mechanism is provided between the outer mold (1) and the pin core mold (2), wherein the fixing mechanism comprises: A pressing plate (31), wherein the pressing plate (31) is in contact with the surface of the pin core mold (2), a protruding block (32) is fixedly connected to the surface of the pin core mold (2), and the surface of the pressing plate (31) is in contact with the surface of the protruding block (32); A plurality of fixing rods (33), each of which is threadedly connected to the outer mold (1), and the fixing rods (33) are symmetrically arranged relative to the center of the outer mold (1); a plurality of through grooves (34) are formed on the surface of the pressing plate (31), and the through grooves (34) are adapted to fit the fixing rods (33); A plurality of fixing springs (35) are sleeved on the surface of the fixing rod (33), and the cross section of the fixing spring (35) is rectangular. One end of the fixing spring (35) contacts a side of the pressure plate (31) away from the protruding block (32).

2. A pin core mold fixing structure for piston casting according to claim 1, characterized in that: Two sliding grooves (41) are provided on the surface of the pressing plate (31), and the two sliding grooves (41) are symmetrically arranged relative to the pin core mold (2).

3. A pin core mold fixing structure for piston casting according to claim 2, characterized in that: Two sliding rods (42) are threadedly connected to one side of the outer mold (1) close to the pressing plate (31), and the sliding rods (42) are adapted to the sliding grooves (41).

4. A pin core mold fixing structure for piston casting according to claim 3, characterized in that: The sliding rod (42) and the fixed rod (33) both comprise a connecting portion, a sliding portion and a protruding portion, and the length of the sliding rod (42) is shorter than that of the fixed rod (33).

5. The pin core mold fixing structure for piston casting according to claim 4 is characterized in that: The surface of the connection portion is provided with a thread, and four connection grooves (43) are provided on a side of the outer mold (1) close to the pressing plate (31), and spiral grooves matching the thread are provided inside the connection grooves (43).

6. The pin core mold fixing structure for piston casting according to claim 4 is characterized in that: The sliding parts are respectively matched with the through groove (34) and the sliding groove (41), and the surface of the sliding parts is smooth.

7. A pin core mold fixing structure for piston casting according to claim 4, characterized in that: The diameter of the protrusion is larger than the diameter of the sliding portion, wherein the diameter of the protrusion on the fixing rod (33) is larger than the outer diameter of the fixing spring (35).

8. The pin core mold fixing structure for piston casting according to claim 1 is characterized in that: Two connecting rods (51) are fixedly connected to a side of the outer mold (1) away from the pressure plate (31); the two connecting rods (51) are symmetrically arranged on the surface of the outer mold (1); and the surfaces of the connecting rods (51) away from the outer mold (1) are both provided with threads.

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