CN-121988742-A - Metal powder injection molding device of linear guide pair slider

CN121988742ACN 121988742 ACN121988742 ACN 121988742ACN-121988742-A

Abstract

The invention discloses a metal powder injection molding device of a linear guide rail pair sliding block, which relates to the technical field of injection molding and comprises a bottom plate, wherein a conveying cylinder is arranged at the upper part of the bottom plate, one end of the conveying cylinder is provided with a driving motor for driving a spiral conveying rod in the conveying cylinder to rotate, the other end of the conveying cylinder is provided with an injection head, one end of the injection head is connected with a molding part mechanism, a feed inlet is arranged at the upper part of one end of the conveying cylinder, and an anti-bridging mechanism is arranged in the feed inlet. According to the metal powder injection molding device of the linear guide rail pair sliding block, the spiral conveying rod in the conveying cylinder is driven by the driving motor to convey materials, meanwhile, the motor output shaft drives the rotating shaft arranged in the feed inlet to rotate through the driving wheel, the belt and the driven wheel, and the stirring rods distributed on the rotating shaft can continuously stir the materials in the feed inlet, so that the materials are effectively prevented from accumulating in the feed inlet and forming a bridging phenomenon, and smooth material discharging is ensured.

Inventors

YANG CONGBIN
WANG XINGZHI
SONG XIAOBO
ZUO PENGJUN
SUN WENJING
WANG XINSHI
YANG XU
ZHANG CHEN

Assignees

陕西华夏粉末冶金有限责任公司
陕西省机械研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20260211

Claims (9)

1. The metal powder injection molding device of the linear guide rail pair sliding block comprises a bottom plate (1), wherein a conveying cylinder (2) is arranged at the upper part of the bottom plate (1), a driving motor (3) for driving a spiral conveying rod in the conveying cylinder (2) to rotate is arranged at one end of the conveying cylinder (2), an injection head (4) is arranged at the other end of the conveying cylinder (2), a forming part mechanism (5) is connected with one end of the injection head (4), a feeding hole (6) is arranged at the upper part of one end of the conveying cylinder (2), and the metal powder injection molding device is characterized in that an anti-bridging mechanism (8) is arranged in the feeding hole (6), the anti-bridging mechanism (8) is driven by an anti-bridging driving assembly (7), and an anti-adhesion mechanism (9) is arranged at one side, far away from the anti-bridging driving assembly (7), of the feeding hole (6); the anti-bridging mechanism (8) comprises a rotating shaft (81) which is rotatably arranged in the feed inlet (6), and a plurality of stirring rods (82) are arranged at the outer side edge of the rotating shaft (81); The anti-sticking mechanism (9) is characterized in that the anti-sticking mechanism comprises a disc (91) which is arranged on one side of a feed inlet (6) far away from an anti-bridging driving component (7), one end of the disc (91) is connected with one end of a rotating shaft (81), the outer side edge of the disc (91) is symmetrically provided with two arc gears (92) by taking the circle center of the disc as a symmetrical point, the front side and the rear side of the feed inlet (6) are respectively provided with a guide shaft (95), the outer sides of the two guide shafts (95) are respectively and transversely sleeved with an L-shaped rod (93), one side, opposite to the two L-shaped rods (93), of each guide shaft is respectively provided with a straight toothed bar (94) matched with the arc gears (92), when the disc (91) rotates, the two arc gears (92) on the disc (91) can sequentially pass through the positions of the two straight toothed bars (94) and are meshed with the two straight toothed bars, the outer sides of the guide shafts (95) are respectively sleeved with a spring II (96), and two ends of the spring II (96) are respectively connected with the inner sides of the L-shaped rods (93) and the outer sides of the feed inlet (6), and one end of the L-shaped rod (93) is provided with a short side of the L-shaped rod (93).
2. The metal powder injection molding device of the linear guide pair sliding block of claim 1, wherein the bridge-preventing driving assembly (7) comprises a driving wheel (71) fixedly sleeved on an output shaft of the driving motor (3) and a driven wheel (72) rotatably installed on one side of the feeding hole (6) far away from the anti-bonding mechanism (9), and the driving wheel (71) is in transmission connection with the driven wheel (72) through a belt (73).
3. The metal powder injection molding device of the linear guide pair slider of claim 1, wherein the extending direction of each stirring rod (82) on the rotating shaft (81) is distributed at multiple angles relative to the radial direction of the rotating shaft (81).
4. The metal powder injection molding device of the linear guide pair slider of claim 1, wherein the second spring (96) is in a reset state, and the collision hammer (97) is abutted against the outer side wall of the feed port (6).
5. The metal powder injection molding device of the linear guide rail pair sliding block of claim 1, wherein the molding part mechanism (5) comprises a limiting plate (51) arranged on the upper portion of the bottom plate (1), one side of the limiting plate (51) is horizontally connected with one end of the injection head (4), the other end of the limiting plate (51) is provided with a fixed die (52), one side of the fixed die (52) is provided with a movable die (53), the movable die (53) is communicated with the inside of the injection head (4), a die opening mechanism (54) is further arranged on one side of the limiting plate (51) above the fixed die (52), guide sleeves (55) are respectively arranged on the front side and the rear side of the movable die (53), one side of the limiting plate (51) is horizontally connected with guide shafts (56) on two sides of the fixed die (52), the guide sleeves (55) are transversely sleeved on the guide shafts (56) in a sliding mode, a connecting plate (57) is connected between the other ends of the two guide shafts (56), one side, close to the movable die (53), of the connecting plate (57) is connected with an ejection mechanism (58), and the molding part mechanism (5) further comprises an auxiliary ejection mechanism (59).
6. The metal powder injection molding device of the linear guide pair slider of claim 5, wherein the mold opening mechanism (54) comprises a servo motor (541) mounted on one side surface of the limiting plate (51), an output shaft of the servo motor (541) is connected with a screw rod (542), a limiting block (543) is screwed on the outer portion of the screw rod (542), and the lower end of the limiting block (543) is fixedly connected with the upper portion of the movable mold (53).
7. The metal powder injection molding device of the linear guide pair slider of claim 5, wherein the demolding aid mechanism (59) comprises a rack bar (591) arranged on the upper sides of two guide shafts (56) and gear plates (593) respectively arranged on the two sides of the movable mold (53) in a rotating mode, a notch (592) is formed in the upper side of the guide sleeve (55), the upper side of the rack bar (591) penetrates through the notch (592) and is in transverse sliding connection with the guide sleeve (55), the gear plates (593) are meshed with the rack bar (591), an incomplete gear (594) is fixedly connected to the center of one face of the gear plates (594), a rack plate (595) is meshed to one side of the incomplete gear plates (594), a concave rod (596) is connected between the upper ends of the two rack plates (595), a T-shaped shaft (597) is symmetrically and vertically arranged in a penetrating sliding mode on the upper portion of the concave rod (596), the lower end of the T-shaped shaft (597) is connected to the upper portion of the movable mold (53) and is further in a state of being in which the concave rod (598) is in contact with the upper portion (598) of the movable mold (598), and the upper portion of the movable mold (598) is in a state of the upper portion of the concave rod (598).
8. The metal powder injection molding device of the linear guide pair sliding block of claim 1, wherein the ejection column (58) comprises a fixed rod (581) connected to the inner side of the connecting plate (57), the fixed rod (581) is of a hollow structure, a movable rod (582) is inserted in the fixed rod (581) in a sliding manner, the other end of the movable rod (582) penetrates through one side surface of the movable die (53) and is flush with the inner wall of the movable die, a round hole matched with the movable rod (582) is formed in one side surface of the movable die (53), a step groove (531) is formed in the inner side of the round hole, a flange (583) is arranged at the outer edge of one end of the movable rod (582), the flange (583) is arranged in the step groove (531), a cavity (584) is further formed in one end of the movable rod (582), a spiral memory alloy (586) is connected to the inner side of the cavity (584), two sides of the piston block (587) are provided with lugs (588), and the inner sides of the spiral memory alloy (586) are provided with guide grooves (589) which are close to the inner sides of the movable die (589).
9. The metal powder injection molding device of the linear guide pair slider of claim 1, wherein when the temperature of the spiral memory alloy (586) is more than 200 ℃, the spiral memory alloy (586) undergoes a shortened phase transition, drives the piston block (587) to displace and move through the position of the through hole (585), and when the temperature of the spiral memory alloy (586) is less than 60 ℃, the spiral memory alloy (586) undergoes an extended phase transition, so that the piston block (587) is reset to be flush with the end face of the movable rod (582).

Description

Metal powder injection molding device of linear guide pair slider Technical Field The invention relates to the technical field of injection molding, in particular to a metal powder injection molding device of a linear guide rail pair sliding block. Background The linear guide rail sliding block is a key functional component in a precise mechanical transmission system, and has strict requirements on the dimensional accuracy, geometric tolerance and surface quality. As a near net forming technology, the metal powder injection molding can be used for efficiently and batchwise manufacturing metal parts with complex shapes and fine structures, and has remarkable technical advantages in the production field of precise structural parts such as linear guide rail sliding blocks. Accordingly, injection molding apparatus for producing such parts are required to have a precise mold system, a stable material delivery and injection unit, and a reliable post-molding treatment function to ensure that the final product meets high-precision use requirements. In the existing metal powder injection molding device, when materials enter an injection system through a feed inlet, bridging phenomenon is easy to occur in the feed inlet due to material flowability problem or powder accumulation, so that blanking is not smooth or even is interrupted, and continuous production and product quality stability are affected. In addition, the temperature of the inner cavity of the die after injection molding is higher, residual air pressure possibly exists, so that molded parts are tightly combined with the inner wall of the die, the problems of difficult demolding, part surface damage or die damage and the like easily occur in the process of demolding, and the production efficiency and the product qualification rate are reduced. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a metal powder injection molding device of a linear guide rail pair sliding block, which solves the problems that the conventional metal powder injection molding device is poor in blanking caused by bridging of a material at a feed inlet and is difficult to demold due to high temperature and air pressure during demolding. The metal powder injection molding device comprises a bottom plate, wherein a conveying cylinder is arranged at the upper part of the bottom plate, a driving motor for driving a spiral conveying rod in the conveying cylinder to rotate is arranged at one end of the conveying cylinder, an injection head is arranged at the other end of the conveying cylinder, a molding part mechanism is connected to one end of the injection head, a feeding hole is formed in the upper part of one end of the conveying cylinder, an anti-bridging mechanism is arranged in the feeding hole and driven by an anti-bridging driving assembly, and an anti-adhesion mechanism is arranged at one side of the feeding hole away from the anti-bridging driving assembly. The bridging prevention mechanism comprises a rotating shaft which is rotatably arranged in the feed inlet, and a plurality of stirring rods are arranged at the outer side edge of the rotating shaft. The anti-sticking mechanism comprises a disc which is arranged on one side of a feed inlet and far away from an anti-bridging driving assembly, one end of the disc is connected with one end of a rotating shaft, the outer side edge of the disc uses the circle center of the disc as a symmetrical point, two arc gears are symmetrically arranged on the front side and the rear side of the feed inlet, guide shafts are arranged on the front side and the rear side of the feed inlet, L-shaped rods are sleeved outside the two guide shafts in a transversely sliding mode, straight racks matched with the arc gears are arranged on the opposite sides of the two L-shaped rods, when the disc rotates, the two arc gears on the disc sequentially pass through the positions of the two straight racks and are meshed with the straight racks, a spring II is sleeved outside the guide shafts, two ends of the spring II are connected with the inner side of the L-shaped rods and the outer side of the feed inlet respectively, and a collision hammer used for colliding the feed inlet is arranged on one end of the short side of the L-shaped rods. Preferably, the bridge-proof driving assembly comprises a driving wheel fixedly sleeved on an output shaft of the driving motor and a driven wheel rotatably installed on one side of the feed inlet far away from the anti-adhesion mechanism, and the driving wheel is connected with the driven wheel through a belt in a transmission manner. Preferably, the extending direction of each stirring rod on the rotating shaft is distributed at multiple angles relative to the radial direction of the rotating shaft. Preferably, when the second spring is in a reset state, the collision hammer props against the outer side wall of the feeding hole. Preferably, the forming part mechanism comprises a li